ffmpeg/avplay.c

/*
 * avplay : Simple Media Player based on the Libav libraries
 * Copyright (c) 2003 Fabrice Bellard
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include "libavutil/avstring.h"
#include "libavutil/colorspace.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/dict.h"
#include "libavutil/parseutils.h"
#include "libavutil/samplefmt.h"
#include "libavformat/avformat.h"
#include "libavdevice/avdevice.h"
#include "libswscale/swscale.h"
#include "libavresample/avresample.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"

#if CONFIG_AVFILTER
# include "libavfilter/avfilter.h"
# include "libavfilter/avfiltergraph.h"
# include "libavfilter/buffersink.h"
#endif

#include "cmdutils.h"

#include <SDL.h>
#include <SDL_thread.h>

#ifdef __MINGW32__
#undef main /* We don't want SDL to override our main() */
#endif

#include <unistd.h>
#include <assert.h>

const char program_name[] = "avplay";
const int program_birth_year = 2003;

#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_AUDIOQ_SIZE (20 * 16 * 1024)
#define MIN_FRAMES 5

/* SDL audio buffer size, in samples. Should be small to have precise
   A/V sync as SDL does not have hardware buffer fullness info. */
#define SDL_AUDIO_BUFFER_SIZE 1024

/* no AV sync correction is done if below the AV sync threshold */
#define AV_SYNC_THRESHOLD 0.01
/* no AV correction is done if too big error */
#define AV_NOSYNC_THRESHOLD 10.0

#define FRAME_SKIP_FACTOR 0.05

/* maximum audio speed change to get correct sync */
#define SAMPLE_CORRECTION_PERCENT_MAX 10

/* we use about AUDIO_DIFF_AVG_NB A-V differences to make the average */
#define AUDIO_DIFF_AVG_NB   20

/* NOTE: the size must be big enough to compensate the hardware audio buffersize size */
#define SAMPLE_ARRAY_SIZE (2 * 65536)

static int sws_flags = SWS_BICUBIC;

typedef struct PacketQueue {
    AVPacketList *first_pkt, *last_pkt;
    int nb_packets;
    int size;
    int abort_request;
    SDL_mutex *mutex;
    SDL_cond *cond;
} PacketQueue;

#define VIDEO_PICTURE_QUEUE_SIZE 2
#define SUBPICTURE_QUEUE_SIZE 4

typedef struct VideoPicture {
    double pts;                                  ///< presentation time stamp for this picture
    double target_clock;                         ///< av_gettime() time at which this should be displayed ideally
    int64_t pos;                                 ///< byte position in file
    SDL_Overlay *bmp;
    int width, height; /* source height & width */
    int allocated;
    int reallocate;
    enum PixelFormat pix_fmt;

#if CONFIG_AVFILTER
    AVFilterBufferRef *picref;
#endif
} VideoPicture;

typedef struct SubPicture {
    double pts; /* presentation time stamp for this picture */
    AVSubtitle sub;
} SubPicture;

enum {
    AV_SYNC_AUDIO_MASTER, /* default choice */
    AV_SYNC_VIDEO_MASTER,
    AV_SYNC_EXTERNAL_CLOCK, /* synchronize to an external clock */
};

typedef struct VideoState {
    SDL_Thread *parse_tid;
    SDL_Thread *video_tid;
    SDL_Thread *refresh_tid;
    AVInputFormat *iformat;
    int no_background;
    int abort_request;
    int paused;
    int last_paused;
    int seek_req;
    int seek_flags;
    int64_t seek_pos;
    int64_t seek_rel;
    int read_pause_return;
    AVFormatContext *ic;

    int audio_stream;

    int av_sync_type;
    double external_clock; /* external clock base */
    int64_t external_clock_time;

    double audio_clock;
    double audio_diff_cum; /* used for AV difference average computation */
    double audio_diff_avg_coef;
    double audio_diff_threshold;
    int audio_diff_avg_count;
    AVStream *audio_st;
    PacketQueue audioq;
    int audio_hw_buf_size;
    uint8_t silence_buf[SDL_AUDIO_BUFFER_SIZE];
    uint8_t *audio_buf;
    uint8_t *audio_buf1;
    unsigned int audio_buf_size; /* in bytes */
    int audio_buf_index; /* in bytes */
    AVPacket audio_pkt_temp;
    AVPacket audio_pkt;
    enum AVSampleFormat sdl_sample_fmt;
    uint64_t sdl_channel_layout;
    int sdl_channels;
    enum AVSampleFormat resample_sample_fmt;
    uint64_t resample_channel_layout;
    AVAudioResampleContext *avr;
    AVFrame *frame;

    int show_audio; /* if true, display audio samples */
    int16_t sample_array[SAMPLE_ARRAY_SIZE];
    int sample_array_index;
    int last_i_start;
    RDFTContext *rdft;
    int rdft_bits;
    FFTSample *rdft_data;
    int xpos;

    SDL_Thread *subtitle_tid;
    int subtitle_stream;
    int subtitle_stream_changed;
    AVStream *subtitle_st;
    PacketQueue subtitleq;
    SubPicture subpq[SUBPICTURE_QUEUE_SIZE];
    int subpq_size, subpq_rindex, subpq_windex;
    SDL_mutex *subpq_mutex;
    SDL_cond *subpq_cond;

    double frame_timer;
    double frame_last_pts;
    double frame_last_delay;
    double video_clock;                          ///< pts of last decoded frame / predicted pts of next decoded frame
    int video_stream;
    AVStream *video_st;
    PacketQueue videoq;
    double video_current_pts;                    ///< current displayed pts (different from video_clock if frame fifos are used)
    double video_current_pts_drift;              ///< video_current_pts - time (av_gettime) at which we updated video_current_pts - used to have running video pts
    int64_t video_current_pos;                   ///< current displayed file pos
    VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
    int pictq_size, pictq_rindex, pictq_windex;
    SDL_mutex *pictq_mutex;
    SDL_cond *pictq_cond;
#if !CONFIG_AVFILTER
    struct SwsContext *img_convert_ctx;
#endif

    //    QETimer *video_timer;
    char filename[1024];
    int width, height, xleft, ytop;

    PtsCorrectionContext pts_ctx;

#if CONFIG_AVFILTER
    AVFilterContext *out_video_filter;          ///< the last filter in the video chain
#endif

    float skip_frames;
    float skip_frames_index;
    int refresh;
} VideoState;

static void show_help(void);

/* options specified by the user */
static AVInputFormat *file_iformat;
static const char *input_filename;
static const char *window_title;
static int fs_screen_width;
static int fs_screen_height;
static int screen_width  = 0;
static int screen_height = 0;
static int audio_disable;
static int video_disable;
static int wanted_stream[AVMEDIA_TYPE_NB] = {
    [AVMEDIA_TYPE_AUDIO]    = -1,
    [AVMEDIA_TYPE_VIDEO]    = -1,
    [AVMEDIA_TYPE_SUBTITLE] = -1,
};
static int seek_by_bytes = -1;
static int display_disable;
static int show_status = 1;
static int av_sync_type = AV_SYNC_AUDIO_MASTER;
static int64_t start_time = AV_NOPTS_VALUE;
static int64_t duration = AV_NOPTS_VALUE;
static int debug = 0;
static int debug_mv = 0;
static int step = 0;
static int workaround_bugs = 1;
static int fast = 0;
static int genpts = 0;
static int idct = FF_IDCT_AUTO;
static enum AVDiscard skip_frame       = AVDISCARD_DEFAULT;
static enum AVDiscard skip_idct        = AVDISCARD_DEFAULT;
static enum AVDiscard skip_loop_filter = AVDISCARD_DEFAULT;
static int error_concealment = 3;
static int decoder_reorder_pts = -1;
static int autoexit;
static int exit_on_keydown;
static int exit_on_mousedown;
static int loop = 1;
static int framedrop = 1;

static int rdftspeed = 20;
#if CONFIG_AVFILTER
static char *vfilters = NULL;
#endif

/* current context */
static int is_full_screen;
static VideoState *cur_stream;
static int64_t audio_callback_time;

static AVPacket flush_pkt;

#define FF_ALLOC_EVENT   (SDL_USEREVENT)
#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)
#define FF_QUIT_EVENT    (SDL_USEREVENT + 2)

static SDL_Surface *screen;

void exit_program(int ret)
{
    exit(ret);
}

static int packet_queue_put(PacketQueue *q, AVPacket *pkt);

/* packet queue handling */
static void packet_queue_init(PacketQueue *q)
{
    memset(q, 0, sizeof(PacketQueue));
    q->mutex = SDL_CreateMutex();
    q->cond = SDL_CreateCond();
    packet_queue_put(q, &flush_pkt);
}

static void packet_queue_flush(PacketQueue *q)
{
    AVPacketList *pkt, *pkt1;

    SDL_LockMutex(q->mutex);
    for (pkt = q->first_pkt; pkt != NULL; pkt = pkt1) {
        pkt1 = pkt->next;
        av_free_packet(&pkt->pkt);
        av_freep(&pkt);
    }
    q->last_pkt = NULL;
    q->first_pkt = NULL;
    q->nb_packets = 0;
    q->size = 0;
    SDL_UnlockMutex(q->mutex);
}

static void packet_queue_end(PacketQueue *q)
{
    packet_queue_flush(q);
    SDL_DestroyMutex(q->mutex);
    SDL_DestroyCond(q->cond);
}

static int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
    AVPacketList *pkt1;

    /* duplicate the packet */
    if (pkt != &flush_pkt && av_dup_packet(pkt) < 0)
        return -1;

    pkt1 = av_malloc(sizeof(AVPacketList));
    if (!pkt1)
        return -1;
    pkt1->pkt = *pkt;
    pkt1->next = NULL;


    SDL_LockMutex(q->mutex);

    if (!q->last_pkt)

        q->first_pkt = pkt1;
    else
        q->last_pkt->next = pkt1;
    q->last_pkt = pkt1;
    q->nb_packets++;
    q->size += pkt1->pkt.size + sizeof(*pkt1);
    /* XXX: should duplicate packet data in DV case */
    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
    return 0;
}

static void packet_queue_abort(PacketQueue *q)
{
    SDL_LockMutex(q->mutex);

    q->abort_request = 1;

    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
}

/* return < 0 if aborted, 0 if no packet and > 0 if packet.  */
static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
    AVPacketList *pkt1;
    int ret;

    SDL_LockMutex(q->mutex);

    for (;;) {
        if (q->abort_request) {
            ret = -1;
            break;
        }

        pkt1 = q->first_pkt;
        if (pkt1) {
            q->first_pkt = pkt1->next;
            if (!q->first_pkt)
                q->last_pkt = NULL;
            q->nb_packets--;
            q->size -= pkt1->pkt.size + sizeof(*pkt1);
            *pkt = pkt1->pkt;
            av_free(pkt1);
            ret = 1;
            break;
        } else if (!block) {
            ret = 0;
            break;
        } else {
            SDL_CondWait(q->cond, q->mutex);
        }
    }
    SDL_UnlockMutex(q->mutex);
    return ret;
}

static inline void fill_rectangle(SDL_Surface *screen,
                                  int x, int y, int w, int h, int color)
{
    SDL_Rect rect;
    rect.x = x;
    rect.y = y;
    rect.w = w;
    rect.h = h;
    SDL_FillRect(screen, &rect, color);
}

#define ALPHA_BLEND(a, oldp, newp, s)\
((((oldp << s) * (255 - (a))) + (newp * (a))) / (255 << s))

#define RGBA_IN(r, g, b, a, s)\
{\
    unsigned int v = ((const uint32_t *)(s))[0];\
    a = (v >> 24) & 0xff;\
    r = (v >> 16) & 0xff;\
    g = (v >> 8) & 0xff;\
    b = v & 0xff;\
}

#define YUVA_IN(y, u, v, a, s, pal)\
{\
    unsigned int val = ((const uint32_t *)(pal))[*(const uint8_t*)(s)];\
    a = (val >> 24) & 0xff;\
    y = (val >> 16) & 0xff;\
    u = (val >> 8) & 0xff;\
    v = val & 0xff;\
}

#define YUVA_OUT(d, y, u, v, a)\
{\
    ((uint32_t *)(d))[0] = (a << 24) | (y << 16) | (u << 8) | v;\
}


#define BPP 1

static void blend_subrect(AVPicture *dst, const AVSubtitleRect *rect, int imgw, int imgh)
{
    int wrap, wrap3, width2, skip2;
    int y, u, v, a, u1, v1, a1, w, h;
    uint8_t *lum, *cb, *cr;
    const uint8_t *p;
    const uint32_t *pal;
    int dstx, dsty, dstw, dsth;

    dstw = av_clip(rect->w, 0, imgw);
    dsth = av_clip(rect->h, 0, imgh);
    dstx = av_clip(rect->x, 0, imgw - dstw);
    dsty = av_clip(rect->y, 0, imgh - dsth);
    lum = dst->data[0] + dsty * dst->linesize[0];
    cb  = dst->data[1] + (dsty >> 1) * dst->linesize[1];
    cr  = dst->data[2] + (dsty >> 1) * dst->linesize[2];

    width2 = ((dstw + 1) >> 1) + (dstx & ~dstw & 1);
    skip2 = dstx >> 1;
    wrap = dst->linesize[0];
    wrap3 = rect->pict.linesize[0];
    p = rect->pict.data[0];
    pal = (const uint32_t *)rect->pict.data[1];  /* Now in YCrCb! */

    if (dsty & 1) {
        lum += dstx;
        cb += skip2;
        cr += skip2;

        if (dstx & 1) {
            YUVA_IN(y, u, v, a, p, pal);
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a >> 2, cb[0], u, 0);
            cr[0] = ALPHA_BLEND(a >> 2, cr[0], v, 0);
            cb++;
            cr++;
            lum++;
            p += BPP;
        }
        for (w = dstw - (dstx & 1); w >= 2; w -= 2) {
            YUVA_IN(y, u, v, a, p, pal);
            u1 = u;
            v1 = v;
            a1 = a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);

            YUVA_IN(y, u, v, a, p + BPP, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[1] = ALPHA_BLEND(a, lum[1], y, 0);
            cb[0] = ALPHA_BLEND(a1 >> 2, cb[0], u1, 1);
            cr[0] = ALPHA_BLEND(a1 >> 2, cr[0], v1, 1);
            cb++;
            cr++;
            p += 2 * BPP;
            lum += 2;
        }
        if (w) {
            YUVA_IN(y, u, v, a, p, pal);
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a >> 2, cb[0], u, 0);
            cr[0] = ALPHA_BLEND(a >> 2, cr[0], v, 0);
            p++;
            lum++;
        }
        p += wrap3 - dstw * BPP;
        lum += wrap - dstw - dstx;
        cb += dst->linesize[1] - width2 - skip2;
        cr += dst->linesize[2] - width2 - skip2;
    }
    for (h = dsth - (dsty & 1); h >= 2; h -= 2) {
        lum += dstx;
        cb += skip2;
        cr += skip2;

        if (dstx & 1) {
            YUVA_IN(y, u, v, a, p, pal);
            u1 = u;
            v1 = v;
            a1 = a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            p += wrap3;
            lum += wrap;
            YUVA_IN(y, u, v, a, p, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a1 >> 2, cb[0], u1, 1);
            cr[0] = ALPHA_BLEND(a1 >> 2, cr[0], v1, 1);
            cb++;
            cr++;
            p += -wrap3 + BPP;
            lum += -wrap + 1;
        }
        for (w = dstw - (dstx & 1); w >= 2; w -= 2) {
            YUVA_IN(y, u, v, a, p, pal);
            u1 = u;
            v1 = v;
            a1 = a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);

            YUVA_IN(y, u, v, a, p + BPP, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[1] = ALPHA_BLEND(a, lum[1], y, 0);
            p += wrap3;
            lum += wrap;

            YUVA_IN(y, u, v, a, p, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);

            YUVA_IN(y, u, v, a, p + BPP, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[1] = ALPHA_BLEND(a, lum[1], y, 0);

            cb[0] = ALPHA_BLEND(a1 >> 2, cb[0], u1, 2);
            cr[0] = ALPHA_BLEND(a1 >> 2, cr[0], v1, 2);

            cb++;
            cr++;
            p += -wrap3 + 2 * BPP;
            lum += -wrap + 2;
        }
        if (w) {
            YUVA_IN(y, u, v, a, p, pal);
            u1 = u;
            v1 = v;
            a1 = a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            p += wrap3;
            lum += wrap;
            YUVA_IN(y, u, v, a, p, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a1 >> 2, cb[0], u1, 1);
            cr[0] = ALPHA_BLEND(a1 >> 2, cr[0], v1, 1);
            cb++;
            cr++;
            p += -wrap3 + BPP;
            lum += -wrap + 1;
        }
        p += wrap3 + (wrap3 - dstw * BPP);
        lum += wrap + (wrap - dstw - dstx);
        cb += dst->linesize[1] - width2 - skip2;
        cr += dst->linesize[2] - width2 - skip2;
    }
    /* handle odd height */
    if (h) {
        lum += dstx;
        cb += skip2;
        cr += skip2;

        if (dstx & 1) {
            YUVA_IN(y, u, v, a, p, pal);
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a >> 2, cb[0], u, 0);
            cr[0] = ALPHA_BLEND(a >> 2, cr[0], v, 0);
            cb++;
            cr++;
            lum++;
            p += BPP;
        }
        for (w = dstw - (dstx & 1); w >= 2; w -= 2) {
            YUVA_IN(y, u, v, a, p, pal);
            u1 = u;
            v1 = v;
            a1 = a;
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);

            YUVA_IN(y, u, v, a, p + BPP, pal);
            u1 += u;
            v1 += v;
            a1 += a;
            lum[1] = ALPHA_BLEND(a, lum[1], y, 0);
            cb[0] = ALPHA_BLEND(a1 >> 2, cb[0], u, 1);
            cr[0] = ALPHA_BLEND(a1 >> 2, cr[0], v, 1);
            cb++;
            cr++;
            p += 2 * BPP;
            lum += 2;
        }
        if (w) {
            YUVA_IN(y, u, v, a, p, pal);
            lum[0] = ALPHA_BLEND(a, lum[0], y, 0);
            cb[0] = ALPHA_BLEND(a >> 2, cb[0], u, 0);
            cr[0] = ALPHA_BLEND(a >> 2, cr[0], v, 0);
        }
    }
}

static void free_subpicture(SubPicture *sp)
{
    avsubtitle_free(&sp->sub);
}

static void video_image_display(VideoState *is)
{
    VideoPicture *vp;
    SubPicture *sp;
    AVPicture pict;
    float aspect_ratio;
    int width, height, x, y;
    SDL_Rect rect;
    int i;

    vp = &is->pictq[is->pictq_rindex];
    if (vp->bmp) {
#if CONFIG_AVFILTER
         if (vp->picref->video->pixel_aspect.num == 0)
             aspect_ratio = 0;
         else
             aspect_ratio = av_q2d(vp->picref->video->pixel_aspect);
#else

        /* XXX: use variable in the frame */
        if (is->video_st->sample_aspect_ratio.num)
            aspect_ratio = av_q2d(is->video_st->sample_aspect_ratio);
        else if (is->video_st->codec->sample_aspect_ratio.num)
            aspect_ratio = av_q2d(is->video_st->codec->sample_aspect_ratio);
        else
            aspect_ratio = 0;
#endif
        if (aspect_ratio <= 0.0)
            aspect_ratio = 1.0;
        aspect_ratio *= (float)vp->width / (float)vp->height;

        if (is->subtitle_st)
        {
            if (is->subpq_size > 0)
            {
                sp = &is->subpq[is->subpq_rindex];

                if (vp->pts >= sp->pts + ((float) sp->sub.start_display_time / 1000))
                {
                    SDL_LockYUVOverlay (vp->bmp);

                    pict.data[0] = vp->bmp->pixels[0];
                    pict.data[1] = vp->bmp->pixels[2];
                    pict.data[2] = vp->bmp->pixels[1];

                    pict.linesize[0] = vp->bmp->pitches[0];
                    pict.linesize[1] = vp->bmp->pitches[2];
                    pict.linesize[2] = vp->bmp->pitches[1];

                    for (i = 0; i < sp->sub.num_rects; i++)
                        blend_subrect(&pict, sp->sub.rects[i],
                                      vp->bmp->w, vp->bmp->h);

                    SDL_UnlockYUVOverlay (vp->bmp);
                }
            }
        }


        /* XXX: we suppose the screen has a 1.0 pixel ratio */
        height = is->height;
        width = ((int)rint(height * aspect_ratio)) & ~1;
        if (width > is->width) {
            width = is->width;
            height = ((int)rint(width / aspect_ratio)) & ~1;
        }
        x = (is->width - width) / 2;
        y = (is->height - height) / 2;
        is->no_background = 0;
        rect.x = is->xleft + x;
        rect.y = is->ytop  + y;
        rect.w = width;
        rect.h = height;
        SDL_DisplayYUVOverlay(vp->bmp, &rect);
    }
}

/* get the current audio output buffer size, in samples. With SDL, we
   cannot have a precise information */
static int audio_write_get_buf_size(VideoState *is)
{
    return is->audio_buf_size - is->audio_buf_index;
}

static inline int compute_mod(int a, int b)
{
    a = a % b;
    if (a >= 0)
        return a;
    else
        return a + b;
}

static void video_audio_display(VideoState *s)
{
    int i, i_start, x, y1, y, ys, delay, n, nb_display_channels;
    int ch, channels, h, h2, bgcolor, fgcolor;
    int16_t time_diff;
    int rdft_bits, nb_freq;

    for (rdft_bits = 1; (1 << rdft_bits) < 2 * s->height; rdft_bits++)
        ;
    nb_freq = 1 << (rdft_bits - 1);

    /* compute display index : center on currently output samples */
    channels = s->sdl_channels;
    nb_display_channels = channels;
    if (!s->paused) {
        int data_used = s->show_audio == 1 ? s->width : (2 * nb_freq);
        n = 2 * channels;
        delay = audio_write_get_buf_size(s);
        delay /= n;

        /* to be more precise, we take into account the time spent since
           the last buffer computation */
        if (audio_callback_time) {
            time_diff = av_gettime() - audio_callback_time;
            delay -= (time_diff * s->audio_st->codec->sample_rate) / 1000000;
        }

        delay += 2 * data_used;
        if (delay < data_used)
            delay = data_used;

        i_start= x = compute_mod(s->sample_array_index - delay * channels, SAMPLE_ARRAY_SIZE);
        if (s->show_audio == 1) {
            h = INT_MIN;
            for (i = 0; i < 1000; i += channels) {
                int idx = (SAMPLE_ARRAY_SIZE + x - i) % SAMPLE_ARRAY_SIZE;
                int a = s->sample_array[idx];
                int b = s->sample_array[(idx + 4 * channels) % SAMPLE_ARRAY_SIZE];
                int c = s->sample_array[(idx + 5 * channels) % SAMPLE_ARRAY_SIZE];
                int d = s->sample_array[(idx + 9 * channels) % SAMPLE_ARRAY_SIZE];
                int score = a - d;
                if (h < score && (b ^ c) < 0) {
                    h = score;
                    i_start = idx;
                }
            }
        }

        s->last_i_start = i_start;
    } else {
        i_start = s->last_i_start;
    }

    bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
    if (s->show_audio == 1) {
        fill_rectangle(screen,
                       s->xleft, s->ytop, s->width, s->height,
                       bgcolor);

        fgcolor = SDL_MapRGB(screen->format, 0xff, 0xff, 0xff);

        /* total height for one channel */
        h = s->height / nb_display_channels;
        /* graph height / 2 */
        h2 = (h * 9) / 20;
        for (ch = 0; ch < nb_display_channels; ch++) {
            i = i_start + ch;
            y1 = s->ytop + ch * h + (h / 2); /* position of center line */
            for (x = 0; x < s->width; x++) {
                y = (s->sample_array[i] * h2) >> 15;
                if (y < 0) {
                    y = -y;
                    ys = y1 - y;
                } else {
                    ys = y1;
                }
                fill_rectangle(screen,
                               s->xleft + x, ys, 1, y,
                               fgcolor);
                i += channels;
                if (i >= SAMPLE_ARRAY_SIZE)
                    i -= SAMPLE_ARRAY_SIZE;
            }
        }

        fgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0xff);

        for (ch = 1; ch < nb_display_channels; ch++) {
            y = s->ytop + ch * h;
            fill_rectangle(screen,
                           s->xleft, y, s->width, 1,
                           fgcolor);
        }
        SDL_UpdateRect(screen, s->xleft, s->ytop, s->width, s->height);
    } else {
        nb_display_channels= FFMIN(nb_display_channels, 2);
        if (rdft_bits != s->rdft_bits) {
            av_rdft_end(s->rdft);
            av_free(s->rdft_data);
            s->rdft = av_rdft_init(rdft_bits, DFT_R2C);
            s->rdft_bits = rdft_bits;
            s->rdft_data = av_malloc(4 * nb_freq * sizeof(*s->rdft_data));
        }
        {
            FFTSample *data[2];
            for (ch = 0; ch < nb_display_channels; ch++) {
                data[ch] = s->rdft_data + 2 * nb_freq * ch;
                i = i_start + ch;
                for (x = 0; x < 2 * nb_freq; x++) {
                    double w = (x-nb_freq) * (1.0 / nb_freq);
                    data[ch][x] = s->sample_array[i] * (1.0 - w * w);
                    i += channels;
                    if (i >= SAMPLE_ARRAY_SIZE)
                        i -= SAMPLE_ARRAY_SIZE;
                }
                av_rdft_calc(s->rdft, data[ch]);
            }
            // least efficient way to do this, we should of course directly access it but its more than fast enough
            for (y = 0; y < s->height; y++) {
                double w = 1 / sqrt(nb_freq);
                int a = sqrt(w * sqrt(data[0][2 * y + 0] * data[0][2 * y + 0] + data[0][2 * y + 1] * data[0][2 * y + 1]));
                int b = (nb_display_channels == 2 ) ? sqrt(w * sqrt(data[1][2 * y + 0] * data[1][2 * y + 0]
                       + data[1][2 * y + 1] * data[1][2 * y + 1])) : a;
                a = FFMIN(a, 255);
                b = FFMIN(b, 255);
                fgcolor = SDL_MapRGB(screen->format, a, b, (a + b) / 2);

                fill_rectangle(screen,
                            s->xpos, s->height-y, 1, 1,
                            fgcolor);
            }
        }
        SDL_UpdateRect(screen, s->xpos, s->ytop, 1, s->height);
        s->xpos++;
        if (s->xpos >= s->width)
            s->xpos= s->xleft;
    }
}

static int video_open(VideoState *is)
{
    int flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL;
    int w,h;

    if (is_full_screen) flags |= SDL_FULLSCREEN;
    else                flags |= SDL_RESIZABLE;

    if (is_full_screen && fs_screen_width) {
        w = fs_screen_width;
        h = fs_screen_height;
    } else if (!is_full_screen && screen_width) {
        w = screen_width;
        h = screen_height;
#if CONFIG_AVFILTER
    } else if (is->out_video_filter && is->out_video_filter->inputs[0]) {
        w = is->out_video_filter->inputs[0]->w;
        h = is->out_video_filter->inputs[0]->h;
#else
    } else if (is->video_st && is->video_st->codec->width) {
        w = is->video_st->codec->width;
        h = is->video_st->codec->height;
#endif
    } else {
        w = 640;
        h = 480;
    }
    if (screen && is->width == screen->w && screen->w == w
       && is->height== screen->h && screen->h == h)
        return 0;

#if defined(__APPLE__) && !SDL_VERSION_ATLEAST(1, 2, 14)
    /* setting bits_per_pixel = 0 or 32 causes blank video on OS X and older SDL */
    screen = SDL_SetVideoMode(w, h, 24, flags);
#else
    screen = SDL_SetVideoMode(w, h, 0, flags);
#endif
    if (!screen) {
        fprintf(stderr, "SDL: could not set video mode - exiting\n");
        return -1;
    }
    if (!window_title)
        window_title = input_filename;
    SDL_WM_SetCaption(window_title, window_title);

    is->width  = screen->w;
    is->height = screen->h;

    return 0;
}

/* display the current picture, if any */
static void video_display(VideoState *is)
{
    if (!screen)
        video_open(cur_stream);
    if (is->audio_st && is->show_audio)
        video_audio_display(is);
    else if (is->video_st)
        video_image_display(is);
}

static int refresh_thread(void *opaque)
{
    VideoState *is= opaque;
    while (!is->abort_request) {
        SDL_Event event;
        event.type = FF_REFRESH_EVENT;
        event.user.data1 = opaque;
        if (!is->refresh) {
            is->refresh = 1;
            SDL_PushEvent(&event);
        }
        usleep(is->audio_st && is->show_audio ? rdftspeed * 1000 : 5000); // FIXME ideally we should wait the correct time but SDLs event passing is so slow it would be silly
    }
    return 0;
}

/* get the current audio clock value */
static double get_audio_clock(VideoState *is)
{
    double pts;
    int hw_buf_size, bytes_per_sec;
    pts = is->audio_clock;
    hw_buf_size = audio_write_get_buf_size(is);
    bytes_per_sec = 0;
    if (is->audio_st) {
        bytes_per_sec = is->audio_st->codec->sample_rate * is->sdl_channels *
                        av_get_bytes_per_sample(is->sdl_sample_fmt);
    }
    if (bytes_per_sec)
        pts -= (double)hw_buf_size / bytes_per_sec;
    return pts;
}

/* get the current video clock value */
static double get_video_clock(VideoState *is)
{
    if (is->paused) {
        return is->video_current_pts;
    } else {
        return is->video_current_pts_drift + av_gettime() / 1000000.0;
    }
}

/* get the current external clock value */
static double get_external_clock(VideoState *is)
{
    int64_t ti;
    ti = av_gettime();
    return is->external_clock + ((ti - is->external_clock_time) * 1e-6);
}

/* get the current master clock value */
static double get_master_clock(VideoState *is)
{
    double val;

    if (is->av_sync_type == AV_SYNC_VIDEO_MASTER) {
        if (is->video_st)
            val = get_video_clock(is);
        else
            val = get_audio_clock(is);
    } else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER) {
        if (is->audio_st)
            val = get_audio_clock(is);
        else
            val = get_video_clock(is);
    } else {
        val = get_external_clock(is);
    }
    return val;
}

/* seek in the stream */
static void stream_seek(VideoState *is, int64_t pos, int64_t rel, int seek_by_bytes)
{
    if (!is->seek_req) {
        is->seek_pos = pos;
        is->seek_rel = rel;
        is->seek_flags &= ~AVSEEK_FLAG_BYTE;
        if (seek_by_bytes)
            is->seek_flags |= AVSEEK_FLAG_BYTE;
        is->seek_req = 1;
    }
}

/* pause or resume the video */
static void stream_pause(VideoState *is)
{
    if (is->paused) {
        is->frame_timer += av_gettime() / 1000000.0 + is->video_current_pts_drift - is->video_current_pts;
        if (is->read_pause_return != AVERROR(ENOSYS)) {
            is->video_current_pts = is->video_current_pts_drift + av_gettime() / 1000000.0;
        }
        is->video_current_pts_drift = is->video_current_pts - av_gettime() / 1000000.0;
    }
    is->paused = !is->paused;
}

static double compute_target_time(double frame_current_pts, VideoState *is)
{
    double delay, sync_threshold, diff;

    /* compute nominal delay */
    delay = frame_current_pts - is->frame_last_pts;
    if (delay <= 0 || delay >= 10.0) {
        /* if incorrect delay, use previous one */
        delay = is->frame_last_delay;
    } else {
        is->frame_last_delay = delay;
    }
    is->frame_last_pts = frame_current_pts;

    /* update delay to follow master synchronisation source */
    if (((is->av_sync_type == AV_SYNC_AUDIO_MASTER && is->audio_st) ||
         is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
        /* if video is slave, we try to correct big delays by
           duplicating or deleting a frame */
        diff = get_video_clock(is) - get_master_clock(is);

        /* skip or repeat frame. We take into account the
           delay to compute the threshold. I still don't know
           if it is the best guess */
        sync_threshold = FFMAX(AV_SYNC_THRESHOLD, delay);
        if (fabs(diff) < AV_NOSYNC_THRESHOLD) {
            if (diff <= -sync_threshold)
                delay = 0;
            else if (diff >= sync_threshold)
                delay = 2 * delay;
        }
    }
    is->frame_timer += delay;

    av_dlog(NULL, "video: delay=%0.3f pts=%0.3f A-V=%f\n",
            delay, frame_current_pts, -diff);

    return is->frame_timer;
}

/* called to display each frame */
static void video_refresh_timer(void *opaque)
{
    VideoState *is = opaque;
    VideoPicture *vp;

    SubPicture *sp, *sp2;

    if (is->video_st) {
retry:
        if (is->pictq_size == 0) {
            // nothing to do, no picture to display in the que
        } else {
            double time = av_gettime() / 1000000.0;
            double next_target;
            /* dequeue the picture */
            vp = &is->pictq[is->pictq_rindex];

            if (time < vp->target_clock)
                return;
            /* update current video pts */
            is->video_current_pts = vp->pts;
            is->video_current_pts_drift = is->video_current_pts - time;
            is->video_current_pos = vp->pos;
            if (is->pictq_size > 1) {
                VideoPicture *nextvp = &is->pictq[(is->pictq_rindex + 1) % VIDEO_PICTURE_QUEUE_SIZE];
                assert(nextvp->target_clock >= vp->target_clock);
                next_target= nextvp->target_clock;
            } else {
                next_target = vp->target_clock + is->video_clock - vp->pts; // FIXME pass durations cleanly
            }
            if (framedrop && time > next_target) {
                is->skip_frames *= 1.0 + FRAME_SKIP_FACTOR;
                if (is->pictq_size > 1 || time > next_target + 0.5) {
                    /* update queue size and signal for next picture */
                    if (++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE)
                        is->pictq_rindex = 0;

                    SDL_LockMutex(is->pictq_mutex);
                    is->pictq_size--;
                    SDL_CondSignal(is->pictq_cond);
                    SDL_UnlockMutex(is->pictq_mutex);
                    goto retry;
                }
            }

            if (is->subtitle_st) {
                if (is->subtitle_stream_changed) {
                    SDL_LockMutex(is->subpq_mutex);

                    while (is->subpq_size) {
                        free_subpicture(&is->subpq[is->subpq_rindex]);

                        /* update queue size and signal for next picture */
                        if (++is->subpq_rindex == SUBPICTURE_QUEUE_SIZE)
                            is->subpq_rindex = 0;

                        is->subpq_size--;
                    }
                    is->subtitle_stream_changed = 0;

                    SDL_CondSignal(is->subpq_cond);
                    SDL_UnlockMutex(is->subpq_mutex);
                } else {
                    if (is->subpq_size > 0) {
                        sp = &is->subpq[is->subpq_rindex];

                        if (is->subpq_size > 1)
                            sp2 = &is->subpq[(is->subpq_rindex + 1) % SUBPICTURE_QUEUE_SIZE];
                        else
                            sp2 = NULL;

                        if ((is->video_current_pts > (sp->pts + ((float) sp->sub.end_display_time / 1000)))
                                || (sp2 && is->video_current_pts > (sp2->pts + ((float) sp2->sub.start_display_time / 1000))))
                        {
                            free_subpicture(sp);

                            /* update queue size and signal for next picture */
                            if (++is->subpq_rindex == SUBPICTURE_QUEUE_SIZE)
                                is->subpq_rindex = 0;

                            SDL_LockMutex(is->subpq_mutex);
                            is->subpq_size--;
                            SDL_CondSignal(is->subpq_cond);
                            SDL_UnlockMutex(is->subpq_mutex);
                        }
                    }
                }
            }

            /* display picture */
            if (!display_disable)
                video_display(is);

            /* update queue size and signal for next picture */
            if (++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE)
                is->pictq_rindex = 0;

            SDL_LockMutex(is->pictq_mutex);
            is->pictq_size--;
            SDL_CondSignal(is->pictq_cond);
            SDL_UnlockMutex(is->pictq_mutex);
        }
    } else if (is->audio_st) {
        /* draw the next audio frame */

        /* if only audio stream, then display the audio bars (better
           than nothing, just to test the implementation */

        /* display picture */
        if (!display_disable)
            video_display(is);
    }
    if (show_status) {
        static int64_t last_time;
        int64_t cur_time;
        int aqsize, vqsize, sqsize;
        double av_diff;

        cur_time = av_gettime();
        if (!last_time || (cur_time - last_time) >= 30000) {
            aqsize = 0;
            vqsize = 0;
            sqsize = 0;
            if (is->audio_st)
                aqsize = is->audioq.size;
            if (is->video_st)
                vqsize = is->videoq.size;
            if (is->subtitle_st)
                sqsize = is->subtitleq.size;
            av_diff = 0;
            if (is->audio_st && is->video_st)
                av_diff = get_audio_clock(is) - get_video_clock(is);
            printf("%7.2f A-V:%7.3f s:%3.1f aq=%5dKB vq=%5dKB sq=%5dB f=%"PRId64"/%"PRId64"   \r",
                   get_master_clock(is), av_diff, FFMAX(is->skip_frames - 1, 0), aqsize / 1024,
                   vqsize / 1024, sqsize, is->pts_ctx.num_faulty_dts, is->pts_ctx.num_faulty_pts);
            fflush(stdout);
            last_time = cur_time;
        }
    }
}

static void stream_close(VideoState *is)
{
    VideoPicture *vp;
    int i;
    /* XXX: use a special url_shutdown call to abort parse cleanly */
    is->abort_request = 1;
    SDL_WaitThread(is->parse_tid, NULL);
    SDL_WaitThread(is->refresh_tid, NULL);

    /* free all pictures */
    for (i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
        vp = &is->pictq[i];
#if CONFIG_AVFILTER
        if (vp->picref) {
            avfilter_unref_buffer(vp->picref);
            vp->picref = NULL;
        }
#endif
        if (vp->bmp) {
            SDL_FreeYUVOverlay(vp->bmp);
            vp->bmp = NULL;
        }
    }
    SDL_DestroyMutex(is->pictq_mutex);
    SDL_DestroyCond(is->pictq_cond);
    SDL_DestroyMutex(is->subpq_mutex);
    SDL_DestroyCond(is->subpq_cond);
#if !CONFIG_AVFILTER
    if (is->img_convert_ctx)
        sws_freeContext(is->img_convert_ctx);
#endif
    av_free(is);
}

static void do_exit(void)
{
    if (cur_stream) {
        stream_close(cur_stream);
        cur_stream = NULL;
    }
    uninit_opts();
#if CONFIG_AVFILTER
    avfilter_uninit();
#endif
    avformat_network_deinit();
    if (show_status)
        printf("\n");
    SDL_Quit();
    av_log(NULL, AV_LOG_QUIET, "");
    exit(0);
}

/* allocate a picture (needs to do that in main thread to avoid
   potential locking problems */
static void alloc_picture(void *opaque)
{
    VideoState *is = opaque;
    VideoPicture *vp;

    vp = &is->pictq[is->pictq_windex];

    if (vp->bmp)
        SDL_FreeYUVOverlay(vp->bmp);

#if CONFIG_AVFILTER
    if (vp->picref)
        avfilter_unref_buffer(vp->picref);
    vp->picref = NULL;

    vp->width   = is->out_video_filter->inputs[0]->w;
    vp->height  = is->out_video_filter->inputs[0]->h;
    vp->pix_fmt = is->out_video_filter->inputs[0]->format;
#else
    vp->width   = is->video_st->codec->width;
    vp->height  = is->video_st->codec->height;
    vp->pix_fmt = is->video_st->codec->pix_fmt;
#endif

    vp->bmp = SDL_CreateYUVOverlay(vp->width, vp->height,
                                   SDL_YV12_OVERLAY,
                                   screen);
    if (!vp->bmp || vp->bmp->pitches[0] < vp->width) {
        /* SDL allocates a buffer smaller than requested if the video
         * overlay hardware is unable to support the requested size. */
        fprintf(stderr, "Error: the video system does not support an image\n"
                        "size of %dx%d pixels. Try using -vf \"scale=w:h\"\n"
                        "to reduce the image size.\n", vp->width, vp->height );
        do_exit();
    }

    SDL_LockMutex(is->pictq_mutex);
    vp->allocated = 1;
    SDL_CondSignal(is->pictq_cond);
    SDL_UnlockMutex(is->pictq_mutex);
}

/**
 *
 * @param pts the dts of the pkt / pts of the frame and guessed if not known
 */
static int queue_picture(VideoState *is, AVFrame *src_frame, double pts, int64_t pos)
{
    VideoPicture *vp;
#if CONFIG_AVFILTER
    AVPicture pict_src;
#else
    int dst_pix_fmt = PIX_FMT_YUV420P;
#endif
    /* wait until we have space to put a new picture */
    SDL_LockMutex(is->pictq_mutex);

    if (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && !is->refresh)
        is->skip_frames = FFMAX(1.0 - FRAME_SKIP_FACTOR, is->skip_frames * (1.0 - FRAME_SKIP_FACTOR));

    while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE &&
           !is->videoq.abort_request) {
        SDL_CondWait(is->pictq_cond, is->pictq_mutex);
    }
    SDL_UnlockMutex(is->pictq_mutex);

    if (is->videoq.abort_request)
        return -1;

    vp = &is->pictq[is->pictq_windex];

    /* alloc or resize hardware picture buffer */
    if (!vp->bmp || vp->reallocate ||
#if CONFIG_AVFILTER
        vp->width  != is->out_video_filter->inputs[0]->w ||
        vp->height != is->out_video_filter->inputs[0]->h) {
#else
        vp->width != is->video_st->codec->width ||
        vp->height != is->video_st->codec->height) {
#endif
        SDL_Event event;

        vp->allocated  = 0;
        vp->reallocate = 0;

        /* the allocation must be done in the main thread to avoid
           locking problems */
        event.type = FF_ALLOC_EVENT;
        event.user.data1 = is;
        SDL_PushEvent(&event);

        /* wait until the picture is allocated */
        SDL_LockMutex(is->pictq_mutex);
        while (!vp->allocated && !is->videoq.abort_request) {
            SDL_CondWait(is->pictq_cond, is->pictq_mutex);
        }
        SDL_UnlockMutex(is->pictq_mutex);

        if (is->videoq.abort_request)
            return -1;
    }

    /* if the frame is not skipped, then display it */
    if (vp->bmp) {
        AVPicture pict = { { 0 } };
#if CONFIG_AVFILTER
        if (vp->picref)
            avfilter_unref_buffer(vp->picref);
        vp->picref = src_frame->opaque;
#endif

        /* get a pointer on the bitmap */
        SDL_LockYUVOverlay (vp->bmp);

        pict.data[0] = vp->bmp->pixels[0];
        pict.data[1] = vp->bmp->pixels[2];
        pict.data[2] = vp->bmp->pixels[1];

        pict.linesize[0] = vp->bmp->pitches[0];
        pict.linesize[1] = vp->bmp->pitches[2];
        pict.linesize[2] = vp->bmp->pitches[1];

#if CONFIG_AVFILTER
        pict_src.data[0] = src_frame->data[0];
        pict_src.data[1] = src_frame->data[1];
        pict_src.data[2] = src_frame->data[2];

        pict_src.linesize[0] = src_frame->linesize[0];
        pict_src.linesize[1] = src_frame->linesize[1];
        pict_src.linesize[2] = src_frame->linesize[2];

        // FIXME use direct rendering
        av_picture_copy(&pict, &pict_src,
                        vp->pix_fmt, vp->width, vp->height);
#else
        sws_flags = av_get_int(sws_opts, "sws_flags", NULL);
        is->img_convert_ctx = sws_getCachedContext(is->img_convert_ctx,
            vp->width, vp->height, vp->pix_fmt, vp->width, vp->height,
            dst_pix_fmt, sws_flags, NULL, NULL, NULL);
        if (is->img_convert_ctx == NULL) {
            fprintf(stderr, "Cannot initialize the conversion context\n");
            exit(1);
        }
        sws_scale(is->img_convert_ctx, src_frame->data, src_frame->linesize,
                  0, vp->height, pict.data, pict.linesize);
#endif
        /* update the bitmap content */
        SDL_UnlockYUVOverlay(vp->bmp);

        vp->pts = pts;
        vp->pos = pos;

        /* now we can update the picture count */
        if (++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE)
            is->pictq_windex = 0;
        SDL_LockMutex(is->pictq_mutex);
        vp->target_clock = compute_target_time(vp->pts, is);

        is->pictq_size++;
        SDL_UnlockMutex(is->pictq_mutex);
    }
    return 0;
}

/**
 * compute the exact PTS for the picture if it is omitted in the stream
 * @param pts1 the dts of the pkt / pts of the frame
 */
static int output_picture2(VideoState *is, AVFrame *src_frame, double pts1, int64_t pos)
{
    double frame_delay, pts;

    pts = pts1;

    if (pts != 0) {
        /* update video clock with pts, if present */
        is->video_clock = pts;
    } else {
        pts = is->video_clock;
    }
    /* update video clock for next frame */
    frame_delay = av_q2d(is->video_st->codec->time_base);
    /* for MPEG2, the frame can be repeated, so we update the
       clock accordingly */
    frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
    is->video_clock += frame_delay;

    return queue_picture(is, src_frame, pts, pos);
}

static int get_video_frame(VideoState *is, AVFrame *frame, int64_t *pts, AVPacket *pkt)
{
    int got_picture, i;

    if (packet_queue_get(&is->videoq, pkt, 1) < 0)
        return -1;

    if (pkt->data == flush_pkt.data) {
        avcodec_flush_buffers(is->video_st->codec);

        SDL_LockMutex(is->pictq_mutex);
        // Make sure there are no long delay timers (ideally we should just flush the que but thats harder)
        for (i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
            is->pictq[i].target_clock= 0;
        }
        while (is->pictq_size && !is->videoq.abort_request) {
            SDL_CondWait(is->pictq_cond, is->pictq_mutex);
        }
        is->video_current_pos = -1;
        SDL_UnlockMutex(is->pictq_mutex);

        init_pts_correction(&is->pts_ctx);
        is->frame_last_pts = AV_NOPTS_VALUE;
        is->frame_last_delay = 0;
        is->frame_timer = (double)av_gettime() / 1000000.0;
        is->skip_frames = 1;
        is->skip_frames_index = 0;
        return 0;
    }

    avcodec_decode_video2(is->video_st->codec, frame, &got_picture, pkt);

    if (got_picture) {
        if (decoder_reorder_pts == -1) {
            *pts = guess_correct_pts(&is->pts_ctx, frame->pkt_pts, frame->pkt_dts);
        } else if (decoder_reorder_pts) {
            *pts = frame->pkt_pts;
        } else {
            *pts = frame->pkt_dts;
        }

        if (*pts == AV_NOPTS_VALUE) {
            *pts = 0;
        }

        is->skip_frames_index += 1;
        if (is->skip_frames_index >= is->skip_frames) {
            is->skip_frames_index -= FFMAX(is->skip_frames, 1.0);
            return 1;
        }

    }
    return 0;
}

#if CONFIG_AVFILTER
typedef struct {
    VideoState *is;
    AVFrame *frame;
    int use_dr1;
} FilterPriv;

static int input_get_buffer(AVCodecContext *codec, AVFrame *pic)
{
    AVFilterContext *ctx = codec->opaque;
    AVFilterBufferRef  *ref;
    int perms = AV_PERM_WRITE;
    int i, w, h, stride[AV_NUM_DATA_POINTERS];
    unsigned edge;
    int pixel_size;

    if (codec->codec->capabilities & CODEC_CAP_NEG_LINESIZES)
        perms |= AV_PERM_NEG_LINESIZES;

    if (pic->buffer_hints & FF_BUFFER_HINTS_VALID) {
        if (pic->buffer_hints & FF_BUFFER_HINTS_READABLE) perms |= AV_PERM_READ;
        if (pic->buffer_hints & FF_BUFFER_HINTS_PRESERVE) perms |= AV_PERM_PRESERVE;
        if (pic->buffer_hints & FF_BUFFER_HINTS_REUSABLE) perms |= AV_PERM_REUSE2;
    }
    if (pic->reference) perms |= AV_PERM_READ | AV_PERM_PRESERVE;

    w = codec->width;
    h = codec->height;
    avcodec_align_dimensions2(codec, &w, &h, stride);
    edge = codec->flags & CODEC_FLAG_EMU_EDGE ? 0 : avcodec_get_edge_width();
    w += edge << 1;
    h += edge << 1;

    if (!(ref = avfilter_get_video_buffer(ctx->outputs[0], perms, w, h)))
        return -1;

    pixel_size = av_pix_fmt_descriptors[ref->format].comp[0].step_minus1 + 1;
    ref->video->w = codec->width;
    ref->video->h = codec->height;
    for (i = 0; i < 4; i ++) {
        unsigned hshift = (i == 1 || i == 2) ? av_pix_fmt_descriptors[ref->format].log2_chroma_w : 0;
        unsigned vshift = (i == 1 || i == 2) ? av_pix_fmt_descriptors[ref->format].log2_chroma_h : 0;

        if (ref->data[i]) {
            ref->data[i]    += ((edge * pixel_size) >> hshift) + ((edge * ref->linesize[i]) >> vshift);
        }
        pic->data[i]     = ref->data[i];
        pic->linesize[i] = ref->linesize[i];
    }
    pic->opaque = ref;
    pic->type   = FF_BUFFER_TYPE_USER;
    pic->reordered_opaque = codec->reordered_opaque;
    pic->width               = codec->width;
    pic->height              = codec->height;
    pic->format              = codec->pix_fmt;
    pic->sample_aspect_ratio = codec->sample_aspect_ratio;
    if (codec->pkt) pic->pkt_pts = codec->pkt->pts;
    else            pic->pkt_pts = AV_NOPTS_VALUE;
    return 0;
}

static void input_release_buffer(AVCodecContext *codec, AVFrame *pic)
{
    memset(pic->data, 0, sizeof(pic->data));
    avfilter_unref_buffer(pic->opaque);
}

static int input_reget_buffer(AVCodecContext *codec, AVFrame *pic)
{
    AVFilterBufferRef *ref = pic->opaque;

    if (pic->data[0] == NULL) {
        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;
        return codec->get_buffer(codec, pic);
    }

    if ((codec->width != ref->video->w) || (codec->height != ref->video->h) ||
        (codec->pix_fmt != ref->format)) {
        av_log(codec, AV_LOG_ERROR, "Picture properties changed.\n");
        return -1;
    }

    pic->reordered_opaque = codec->reordered_opaque;
    if (codec->pkt) pic->pkt_pts = codec->pkt->pts;
    else            pic->pkt_pts = AV_NOPTS_VALUE;
    return 0;
}

static int input_init(AVFilterContext *ctx, const char *args, void *opaque)
{
    FilterPriv *priv = ctx->priv;
    AVCodecContext *codec;
    if (!opaque) return -1;

    priv->is = opaque;
    codec    = priv->is->video_st->codec;
    codec->opaque = ctx;
    if (codec->codec->capabilities & CODEC_CAP_DR1) {
        priv->use_dr1 = 1;
        codec->get_buffer     = input_get_buffer;
        codec->release_buffer = input_release_buffer;
        codec->reget_buffer   = input_reget_buffer;
        codec->thread_safe_callbacks = 1;
    }

    priv->frame = avcodec_alloc_frame();

    return 0;
}

static void input_uninit(AVFilterContext *ctx)
{
    FilterPriv *priv = ctx->priv;
    av_free(priv->frame);
}

static int input_request_frame(AVFilterLink *link)
{
    FilterPriv *priv = link->src->priv;
    AVFilterBufferRef *picref;
    int64_t pts = 0;
    AVPacket pkt;
    int ret;

    while (!(ret = get_video_frame(priv->is, priv->frame, &pts, &pkt)))
        av_free_packet(&pkt);
    if (ret < 0)
        return -1;

    if (priv->use_dr1) {
        picref = avfilter_ref_buffer(priv->frame->opaque, ~0);
    } else {
        picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, link->w, link->h);
        av_image_copy(picref->data, picref->linesize,
                      priv->frame->data, priv->frame->linesize,
                      picref->format, link->w, link->h);
    }
    av_free_packet(&pkt);

    avfilter_copy_frame_props(picref, priv->frame);
    picref->pts = pts;

    avfilter_start_frame(link, picref);
    avfilter_draw_slice(link, 0, link->h, 1);
    avfilter_end_frame(link);

    return 0;
}

static int input_query_formats(AVFilterContext *ctx)
{
    FilterPriv *priv = ctx->priv;
    enum PixelFormat pix_fmts[] = {
        priv->is->video_st->codec->pix_fmt, PIX_FMT_NONE
    };

    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
    return 0;
}

static int input_config_props(AVFilterLink *link)
{
    FilterPriv *priv  = link->src->priv;
    AVCodecContext *c = priv->is->video_st->codec;

    link->w = c->width;
    link->h = c->height;
    link->time_base = priv->is->video_st->time_base;

    return 0;
}

static AVFilter input_filter =
{
    .name      = "avplay_input",

    .priv_size = sizeof(FilterPriv),

    .init      = input_init,
    .uninit    = input_uninit,

    .query_formats = input_query_formats,

    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
    .outputs   = (AVFilterPad[]) {{ .name = "default",
                                    .type = AVMEDIA_TYPE_VIDEO,
                                    .request_frame = input_request_frame,
                                    .config_props  = input_config_props, },
                                  { .name = NULL }},
};

static int configure_video_filters(AVFilterGraph *graph, VideoState *is, const char *vfilters)
{
    char sws_flags_str[128];
    int ret;
    AVFilterContext *filt_src = NULL, *filt_out = NULL, *filt_format;
    snprintf(sws_flags_str, sizeof(sws_flags_str), "flags=%d", sws_flags);
    graph->scale_sws_opts = av_strdup(sws_flags_str);

    if ((ret = avfilter_graph_create_filter(&filt_src, &input_filter, "src",
                                            NULL, is, graph)) < 0)
        return ret;
    if ((ret = avfilter_graph_create_filter(&filt_out,
                                            avfilter_get_by_name("buffersink"),
                                            "out", NULL, NULL, graph)) < 0)
        return ret;

    if ((ret = avfilter_graph_create_filter(&filt_format,
                                            avfilter_get_by_name("format"),
                                            "format", "yuv420p", NULL, graph)) < 0)
        return ret;
    if ((ret = avfilter_link(filt_format, 0, filt_out, 0)) < 0)
        return ret;


    if (vfilters) {
        AVFilterInOut *outputs = avfilter_inout_alloc();
        AVFilterInOut *inputs  = avfilter_inout_alloc();

        outputs->name    = av_strdup("in");
        outputs->filter_ctx = filt_src;
        outputs->pad_idx = 0;
        outputs->next    = NULL;

        inputs->name    = av_strdup("out");
        inputs->filter_ctx = filt_format;
        inputs->pad_idx = 0;
        inputs->next    = NULL;

        if ((ret = avfilter_graph_parse(graph, vfilters, inputs, outputs, NULL)) < 0)
            return ret;
    } else {
        if ((ret = avfilter_link(filt_src, 0, filt_format, 0)) < 0)
            return ret;
    }

    if ((ret = avfilter_graph_config(graph, NULL)) < 0)
        return ret;

    is->out_video_filter = filt_out;

    return ret;
}

#endif  /* CONFIG_AVFILTER */

static int video_thread(void *arg)
{
    VideoState *is = arg;
    AVFrame *frame = avcodec_alloc_frame();
    int64_t pts_int;
    double pts;
    int ret;

#if CONFIG_AVFILTER
    AVFilterGraph *graph = avfilter_graph_alloc();
    AVFilterContext *filt_out = NULL;
    int64_t pos;
    int last_w = is->video_st->codec->width;
    int last_h = is->video_st->codec->height;

    if ((ret = configure_video_filters(graph, is, vfilters)) < 0)
        goto the_end;
    filt_out = is->out_video_filter;
#endif

    for (;;) {
#if !CONFIG_AVFILTER
        AVPacket pkt;
#else
        AVFilterBufferRef *picref;
        AVRational tb;
#endif
        while (is->paused && !is->videoq.abort_request)
            SDL_Delay(10);
#if CONFIG_AVFILTER
        if (   last_w != is->video_st->codec->width
            || last_h != is->video_st->codec->height) {
            av_dlog(NULL, "Changing size %dx%d -> %dx%d\n", last_w, last_h,
                    is->video_st->codec->width, is->video_st->codec->height);
            avfilter_graph_free(&graph);
            graph = avfilter_graph_alloc();
            if ((ret = configure_video_filters(graph, is, vfilters)) < 0)
                goto the_end;
            filt_out = is->out_video_filter;
            last_w = is->video_st->codec->width;
            last_h = is->video_st->codec->height;
        }
        ret = av_buffersink_read(filt_out, &picref);
        if (picref) {
            avfilter_copy_buf_props(frame, picref);

            pts_int = picref->pts;
            tb      = filt_out->inputs[0]->time_base;
            pos     = picref->pos;
            frame->opaque = picref;

            ret = 1;
        }

        if (ret >= 0 && av_cmp_q(tb, is->video_st->time_base)) {
            av_unused int64_t pts1 = pts_int;
            pts_int = av_rescale_q(pts_int, tb, is->video_st->time_base);
            av_dlog(NULL, "video_thread(): "
                    "tb:%d/%d pts:%"PRId64" -> tb:%d/%d pts:%"PRId64"\n",
                    tb.num, tb.den, pts1,
                    is->video_st->time_base.num, is->video_st->time_base.den, pts_int);
        }
#else
        ret = get_video_frame(is, frame, &pts_int, &pkt);
#endif

        if (ret < 0)
            goto the_end;

        if (!ret)
            continue;

        pts = pts_int * av_q2d(is->video_st->time_base);

#if CONFIG_AVFILTER
        ret = output_picture2(is, frame, pts, pos);
#else
        ret = output_picture2(is, frame, pts,  pkt.pos);
        av_free_packet(&pkt);
#endif
        if (ret < 0)
            goto the_end;

        if (step)
            if (cur_stream)
                stream_pause(cur_stream);
    }
 the_end:
#if CONFIG_AVFILTER
    av_freep(&vfilters);
    avfilter_graph_free(&graph);
#endif
    av_free(frame);
    return 0;
}

static int subtitle_thread(void *arg)
{
    VideoState *is = arg;
    SubPicture *sp;
    AVPacket pkt1, *pkt = &pkt1;
    int got_subtitle;
    double pts;
    int i, j;
    int r, g, b, y, u, v, a;

    for (;;) {
        while (is->paused && !is->subtitleq.abort_request) {
            SDL_Delay(10);
        }
        if (packet_queue_get(&is->subtitleq, pkt, 1) < 0)
            break;

        if (pkt->data == flush_pkt.data) {
            avcodec_flush_buffers(is->subtitle_st->codec);
            continue;
        }
        SDL_LockMutex(is->subpq_mutex);
        while (is->subpq_size >= SUBPICTURE_QUEUE_SIZE &&
               !is->subtitleq.abort_request) {
            SDL_CondWait(is->subpq_cond, is->subpq_mutex);
        }
        SDL_UnlockMutex(is->subpq_mutex);

        if (is->subtitleq.abort_request)
            return 0;

        sp = &is->subpq[is->subpq_windex];

       /* NOTE: ipts is the PTS of the _first_ picture beginning in
           this packet, if any */
        pts = 0;
        if (pkt->pts != AV_NOPTS_VALUE)
            pts = av_q2d(is->subtitle_st->time_base) * pkt->pts;

        avcodec_decode_subtitle2(is->subtitle_st->codec, &sp->sub,
                                 &got_subtitle, pkt);

        if (got_subtitle && sp->sub.format == 0) {
            sp->pts = pts;

            for (i = 0; i < sp->sub.num_rects; i++)
            {
                for (j = 0; j < sp->sub.rects[i]->nb_colors; j++)
                {
                    RGBA_IN(r, g, b, a, (uint32_t*)sp->sub.rects[i]->pict.data[1] + j);
                    y = RGB_TO_Y_CCIR(r, g, b);
                    u = RGB_TO_U_CCIR(r, g, b, 0);
                    v = RGB_TO_V_CCIR(r, g, b, 0);
                    YUVA_OUT((uint32_t*)sp->sub.rects[i]->pict.data[1] + j, y, u, v, a);
                }
            }

            /* now we can update the picture count */
            if (++is->subpq_windex == SUBPICTURE_QUEUE_SIZE)
                is->subpq_windex = 0;
            SDL_LockMutex(is->subpq_mutex);
            is->subpq_size++;
            SDL_UnlockMutex(is->subpq_mutex);
        }
        av_free_packet(pkt);
    }
    return 0;
}

/* copy samples for viewing in editor window */
static void update_sample_display(VideoState *is, short *samples, int samples_size)
{
    int size, len;

    size = samples_size / sizeof(short);
    while (size > 0) {
        len = SAMPLE_ARRAY_SIZE - is->sample_array_index;
        if (len > size)
            len = size;
        memcpy(is->sample_array + is->sample_array_index, samples, len * sizeof(short));
        samples += len;
        is->sample_array_index += len;
        if (is->sample_array_index >= SAMPLE_ARRAY_SIZE)
            is->sample_array_index = 0;
        size -= len;
    }
}

/* return the new audio buffer size (samples can be added or deleted
   to get better sync if video or external master clock) */
static int synchronize_audio(VideoState *is, short *samples,
                             int samples_size1, double pts)
{
    int n, samples_size;
    double ref_clock;

    n = is->sdl_channels * av_get_bytes_per_sample(is->sdl_sample_fmt);
    samples_size = samples_size1;

    /* if not master, then we try to remove or add samples to correct the clock */
    if (((is->av_sync_type == AV_SYNC_VIDEO_MASTER && is->video_st) ||
         is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
        double diff, avg_diff;
        int wanted_size, min_size, max_size, nb_samples;

        ref_clock = get_master_clock(is);
        diff = get_audio_clock(is) - ref_clock;

        if (diff < AV_NOSYNC_THRESHOLD) {
            is->audio_diff_cum = diff + is->audio_diff_avg_coef * is->audio_diff_cum;
            if (is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) {
                /* not enough measures to have a correct estimate */
                is->audio_diff_avg_count++;
            } else {
                /* estimate the A-V difference */
                avg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);

                if (fabs(avg_diff) >= is->audio_diff_threshold) {
                    wanted_size = samples_size + ((int)(diff * is->audio_st->codec->sample_rate) * n);
                    nb_samples = samples_size / n;

                    min_size = ((nb_samples * (100 - SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    max_size = ((nb_samples * (100 + SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    if (wanted_size < min_size)
                        wanted_size = min_size;
                    else if (wanted_size > max_size)
                        wanted_size = max_size;

                    /* add or remove samples to correction the synchro */
                    if (wanted_size < samples_size) {
                        /* remove samples */
                        samples_size = wanted_size;
                    } else if (wanted_size > samples_size) {
                        uint8_t *samples_end, *q;
                        int nb;

                        /* add samples */
                        nb = (samples_size - wanted_size);
                        samples_end = (uint8_t *)samples + samples_size - n;
                        q = samples_end + n;
                        while (nb > 0) {
                            memcpy(q, samples_end, n);
                            q += n;
                            nb -= n;
                        }
                        samples_size = wanted_size;
                    }
                }
                av_dlog(NULL, "diff=%f adiff=%f sample_diff=%d apts=%0.3f vpts=%0.3f %f\n",
                        diff, avg_diff, samples_size - samples_size1,
                        is->audio_clock, is->video_clock, is->audio_diff_threshold);
            }
        } else {
            /* too big difference : may be initial PTS errors, so
               reset A-V filter */
            is->audio_diff_avg_count = 0;
            is->audio_diff_cum       = 0;
        }
    }

    return samples_size;
}

/* decode one audio frame and returns its uncompressed size */
static int audio_decode_frame(VideoState *is, double *pts_ptr)
{
    AVPacket *pkt_temp = &is->audio_pkt_temp;
    AVPacket *pkt = &is->audio_pkt;
    AVCodecContext *dec = is->audio_st->codec;
    int n, len1, data_size, got_frame;
    double pts;
    int new_packet = 0;
    int flush_complete = 0;

    for (;;) {
        /* NOTE: the audio packet can contain several frames */
        while (pkt_temp->size > 0 || (!pkt_temp->data && new_packet)) {
            int resample_changed, audio_resample;

            if (!is->frame) {
                if (!(is->frame = avcodec_alloc_frame()))
                    return AVERROR(ENOMEM);
            } else
                avcodec_get_frame_defaults(is->frame);

            if (flush_complete)
                break;
            new_packet = 0;
            len1 = avcodec_decode_audio4(dec, is->frame, &got_frame, pkt_temp);
            if (len1 < 0) {
                /* if error, we skip the frame */
                pkt_temp->size = 0;
                break;
            }

            pkt_temp->data += len1;
            pkt_temp->size -= len1;

            if (!got_frame) {
                /* stop sending empty packets if the decoder is finished */
                if (!pkt_temp->data && dec->codec->capabilities & CODEC_CAP_DELAY)
                    flush_complete = 1;
                continue;
            }
            data_size = av_samples_get_buffer_size(NULL, dec->channels,
                                                   is->frame->nb_samples,
                                                   dec->sample_fmt, 1);

            audio_resample = dec->sample_fmt     != is->sdl_sample_fmt ||
                             dec->channel_layout != is->sdl_channel_layout;

            resample_changed = dec->sample_fmt     != is->resample_sample_fmt ||
                               dec->channel_layout != is->resample_channel_layout;

            if ((!is->avr && audio_resample) || resample_changed) {
                int ret;
                if (is->avr)
                    avresample_close(is->avr);
                else if (audio_resample) {
                    is->avr = avresample_alloc_context();
                    if (!is->avr) {
                        fprintf(stderr, "error allocating AVAudioResampleContext\n");
                        break;
                    }
                }
                if (audio_resample) {
                    av_opt_set_int(is->avr, "in_channel_layout",  dec->channel_layout,    0);
                    av_opt_set_int(is->avr, "in_sample_fmt",      dec->sample_fmt,        0);
                    av_opt_set_int(is->avr, "in_sample_rate",     dec->sample_rate,       0);
                    av_opt_set_int(is->avr, "out_channel_layout", is->sdl_channel_layout, 0);
                    av_opt_set_int(is->avr, "out_sample_fmt",     is->sdl_sample_fmt,     0);
                    av_opt_set_int(is->avr, "out_sample_rate",    dec->sample_rate,       0);
                    if (av_get_bytes_per_sample(dec->sample_fmt) <= 2)
                        av_opt_set_int(is->avr, "internal_sample_fmt", AV_SAMPLE_FMT_S16P, 0);

                    if ((ret = avresample_open(is->avr)) < 0) {
                        fprintf(stderr, "error initializing libavresample\n");
                        break;
                    }
                }
                is->resample_sample_fmt     = dec->sample_fmt;
                is->resample_channel_layout = dec->channel_layout;
            }

            if (audio_resample) {
                void *tmp_out;
                int out_samples, out_size, out_linesize;
                int osize      = av_get_bytes_per_sample(is->sdl_sample_fmt);
                int nb_samples = is->frame->nb_samples;

                out_size = av_samples_get_buffer_size(&out_linesize,
                                                      is->sdl_channels,
                                                      nb_samples,
                                                      is->sdl_sample_fmt, 0);
                tmp_out = av_realloc(is->audio_buf1, out_size);
                if (!tmp_out)
                    return AVERROR(ENOMEM);
                is->audio_buf1 = tmp_out;

                out_samples = avresample_convert(is->avr,
                                                 (void **)&is->audio_buf1,
                                                 out_linesize, nb_samples,
                                                 (void **)is->frame->data,
                                                 is->frame->linesize[0],
                                                 is->frame->nb_samples);
                if (out_samples < 0) {
                    fprintf(stderr, "avresample_convert() failed\n");
                    break;
                }
                is->audio_buf = is->audio_buf1;
                data_size = out_samples * osize * is->sdl_channels;
            } else {
                is->audio_buf = is->frame->data[0];
            }

            /* if no pts, then compute it */
            pts = is->audio_clock;
            *pts_ptr = pts;
            n = is->sdl_channels * av_get_bytes_per_sample(is->sdl_sample_fmt);
            is->audio_clock += (double)data_size /
                (double)(n * dec->sample_rate);
#ifdef DEBUG
            {
                static double last_clock;
                printf("audio: delay=%0.3f clock=%0.3f pts=%0.3f\n",
                       is->audio_clock - last_clock,
                       is->audio_clock, pts);
                last_clock = is->audio_clock;
            }
#endif
            return data_size;
        }

        /* free the current packet */
        if (pkt->data)
            av_free_packet(pkt);
        memset(pkt_temp, 0, sizeof(*pkt_temp));

        if (is->paused || is->audioq.abort_request) {
            return -1;
        }

        /* read next packet */
        if ((new_packet = packet_queue_get(&is->audioq, pkt, 1)) < 0)
            return -1;

        if (pkt->data == flush_pkt.data) {
            avcodec_flush_buffers(dec);
            flush_complete = 0;
        }

        *pkt_temp = *pkt;

        /* if update the audio clock with the pts */
        if (pkt->pts != AV_NOPTS_VALUE) {
            is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;
        }
    }
}

/* prepare a new audio buffer */
static void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
{
    VideoState *is = opaque;
    int audio_size, len1;
    double pts;

    audio_callback_time = av_gettime();

    while (len > 0) {
        if (is->audio_buf_index >= is->audio_buf_size) {
           audio_size = audio_decode_frame(is, &pts);
           if (audio_size < 0) {
                /* if error, just output silence */
               is->audio_buf      = is->silence_buf;
               is->audio_buf_size = sizeof(is->silence_buf);
           } else {
               if (is->show_audio)
                   update_sample_display(is, (int16_t *)is->audio_buf, audio_size);
               audio_size = synchronize_audio(is, (int16_t *)is->audio_buf, audio_size,
                                              pts);
               is->audio_buf_size = audio_size;
           }
           is->audio_buf_index = 0;
        }
        len1 = is->audio_buf_size - is->audio_buf_index;
        if (len1 > len)
            len1 = len;
        memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1);
        len -= len1;
        stream += len1;
        is->audio_buf_index += len1;
    }
}

/* open a given stream. Return 0 if OK */
static int stream_component_open(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *avctx;
    AVCodec *codec;
    SDL_AudioSpec wanted_spec, spec;
    AVDictionary *opts;
    AVDictionaryEntry *t = NULL;

    if (stream_index < 0 || stream_index >= ic->nb_streams)
        return -1;
    avctx = ic->streams[stream_index]->codec;

    opts = filter_codec_opts(codec_opts, avctx->codec_id, ic, ic->streams[stream_index]);

    codec = avcodec_find_decoder(avctx->codec_id);
    avctx->debug_mv          = debug_mv;
    avctx->debug             = debug;
    avctx->workaround_bugs   = workaround_bugs;
    avctx->idct_algo         = idct;
    avctx->skip_frame        = skip_frame;
    avctx->skip_idct         = skip_idct;
    avctx->skip_loop_filter  = skip_loop_filter;
    avctx->error_concealment = error_concealment;

    if (fast)   avctx->flags2 |= CODEC_FLAG2_FAST;

    if (!av_dict_get(opts, "threads", NULL, 0))
        av_dict_set(&opts, "threads", "auto", 0);
    if (!codec ||
        avcodec_open2(avctx, codec, &opts) < 0)
        return -1;
    if ((t = av_dict_get(opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
        av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);
        return AVERROR_OPTION_NOT_FOUND;
    }

    /* prepare audio output */
    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO) {
        wanted_spec.freq = avctx->sample_rate;
        wanted_spec.format = AUDIO_S16SYS;

        if (!avctx->channel_layout)
            avctx->channel_layout = av_get_default_channel_layout(avctx->channels);
        if (!avctx->channel_layout) {
            fprintf(stderr, "unable to guess channel layout\n");
            return -1;
        }
        if (avctx->channels == 1)
            is->sdl_channel_layout = AV_CH_LAYOUT_MONO;
        else
            is->sdl_channel_layout = AV_CH_LAYOUT_STEREO;
        is->sdl_channels = av_get_channel_layout_nb_channels(is->sdl_channel_layout);

        wanted_spec.channels = is->sdl_channels;
        wanted_spec.silence = 0;
        wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
        wanted_spec.callback = sdl_audio_callback;
        wanted_spec.userdata = is;
        if (SDL_OpenAudio(&wanted_spec, &spec) < 0) {
            fprintf(stderr, "SDL_OpenAudio: %s\n", SDL_GetError());
            return -1;
        }
        is->audio_hw_buf_size = spec.size;
        is->sdl_sample_fmt          = AV_SAMPLE_FMT_S16;
        is->resample_sample_fmt     = is->sdl_sample_fmt;
        is->resample_channel_layout = is->sdl_channel_layout;
    }

    ic->streams[stream_index]->discard = AVDISCARD_DEFAULT;
    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_AUDIO:
        is->audio_stream = stream_index;
        is->audio_st = ic->streams[stream_index];
        is->audio_buf_size  = 0;
        is->audio_buf_index = 0;

        /* init averaging filter */
        is->audio_diff_avg_coef  = exp(log(0.01) / AUDIO_DIFF_AVG_NB);
        is->audio_diff_avg_count = 0;
        /* since we do not have a precise anough audio fifo fullness,
           we correct audio sync only if larger than this threshold */
        is->audio_diff_threshold = 2.0 * SDL_AUDIO_BUFFER_SIZE / avctx->sample_rate;

        memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
        packet_queue_init(&is->audioq);
        SDL_PauseAudio(0);
        break;
    case AVMEDIA_TYPE_VIDEO:
        is->video_stream = stream_index;
        is->video_st = ic->streams[stream_index];

        packet_queue_init(&is->videoq);
        is->video_tid = SDL_CreateThread(video_thread, is);
        break;
    case AVMEDIA_TYPE_SUBTITLE:
        is->subtitle_stream = stream_index;
        is->subtitle_st = ic->streams[stream_index];
        packet_queue_init(&is->subtitleq);

        is->subtitle_tid = SDL_CreateThread(subtitle_thread, is);
        break;
    default:
        break;
    }
    return 0;
}

static void stream_component_close(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *avctx;

    if (stream_index < 0 || stream_index >= ic->nb_streams)
        return;
    avctx = ic->streams[stream_index]->codec;

    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_AUDIO:
        packet_queue_abort(&is->audioq);

        SDL_CloseAudio();

        packet_queue_end(&is->audioq);
        av_free_packet(&is->audio_pkt);
        if (is->avr)
            avresample_free(&is->avr);
        av_freep(&is->audio_buf1);
        is->audio_buf = NULL;
        av_freep(&is->frame);

        if (is->rdft) {
            av_rdft_end(is->rdft);
            av_freep(&is->rdft_data);
            is->rdft = NULL;
            is->rdft_bits = 0;
        }
        break;
    case AVMEDIA_TYPE_VIDEO:
        packet_queue_abort(&is->videoq);

        /* note: we also signal this mutex to make sure we deblock the
           video thread in all cases */
        SDL_LockMutex(is->pictq_mutex);
        SDL_CondSignal(is->pictq_cond);
        SDL_UnlockMutex(is->pictq_mutex);

        SDL_WaitThread(is->video_tid, NULL);

        packet_queue_end(&is->videoq);
        break;
    case AVMEDIA_TYPE_SUBTITLE:
        packet_queue_abort(&is->subtitleq);

        /* note: we also signal this mutex to make sure we deblock the
           video thread in all cases */
        SDL_LockMutex(is->subpq_mutex);
        is->subtitle_stream_changed = 1;

        SDL_CondSignal(is->subpq_cond);
        SDL_UnlockMutex(is->subpq_mutex);

        SDL_WaitThread(is->subtitle_tid, NULL);

        packet_queue_end(&is->subtitleq);
        break;
    default:
        break;
    }

    ic->streams[stream_index]->discard = AVDISCARD_ALL;
    avcodec_close(avctx);
    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_AUDIO:
        is->audio_st = NULL;
        is->audio_stream = -1;
        break;
    case AVMEDIA_TYPE_VIDEO:
        is->video_st = NULL;
        is->video_stream = -1;
        break;
    case AVMEDIA_TYPE_SUBTITLE:
        is->subtitle_st = NULL;
        is->subtitle_stream = -1;
        break;
    default:
        break;
    }
}

/* since we have only one decoding thread, we can use a global
   variable instead of a thread local variable */
static VideoState *global_video_state;

static int decode_interrupt_cb(void *ctx)
{
    return global_video_state && global_video_state->abort_request;
}

/* this thread gets the stream from the disk or the network */
static int decode_thread(void *arg)
{
    VideoState *is = arg;
    AVFormatContext *ic = NULL;
    int err, i, ret;
    int st_index[AVMEDIA_TYPE_NB];
    AVPacket pkt1, *pkt = &pkt1;
    int eof = 0;
    int pkt_in_play_range = 0;
    AVDictionaryEntry *t;
    AVDictionary **opts;
    int orig_nb_streams;

    memset(st_index, -1, sizeof(st_index));
    is->video_stream = -1;
    is->audio_stream = -1;
    is->subtitle_stream = -1;

    global_video_state = is;

    ic = avformat_alloc_context();
    ic->interrupt_callback.callback = decode_interrupt_cb;
    err = avformat_open_input(&ic, is->filename, is->iformat, &format_opts);
    if (err < 0) {
        print_error(is->filename, err);
        ret = -1;
        goto fail;
    }
    if ((t = av_dict_get(format_opts, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
        av_log(NULL, AV_LOG_ERROR, "Option %s not found.\n", t->key);
        ret = AVERROR_OPTION_NOT_FOUND;
        goto fail;
    }
    is->ic = ic;

    if (genpts)
        ic->flags |= AVFMT_FLAG_GENPTS;

    opts = setup_find_stream_info_opts(ic, codec_opts);
    orig_nb_streams = ic->nb_streams;

    err = avformat_find_stream_info(ic, opts);
    if (err < 0) {
        fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
        ret = -1;
        goto fail;
    }
    for (i = 0; i < orig_nb_streams; i++)
        av_dict_free(&opts[i]);
    av_freep(&opts);

    if (ic->pb)
        ic->pb->eof_reached = 0; // FIXME hack, avplay maybe should not use url_feof() to test for the end

    if (seek_by_bytes < 0)
        seek_by_bytes = !!(ic->iformat->flags & AVFMT_TS_DISCONT);

    /* if seeking requested, we execute it */
    if (start_time != AV_NOPTS_VALUE) {
        int64_t timestamp;

        timestamp = start_time;
        /* add the stream start time */
        if (ic->start_time != AV_NOPTS_VALUE)
            timestamp += ic->start_time;
        ret = avformat_seek_file(ic, -1, INT64_MIN, timestamp, INT64_MAX, 0);
        if (ret < 0) {
            fprintf(stderr, "%s: could not seek to position %0.3f\n",
                    is->filename, (double)timestamp / AV_TIME_BASE);
        }
    }

    for (i = 0; i < ic->nb_streams; i++)
        ic->streams[i]->discard = AVDISCARD_ALL;
    if (!video_disable)
        st_index[AVMEDIA_TYPE_VIDEO] =
            av_find_best_stream(ic, AVMEDIA_TYPE_VIDEO,
                                wanted_stream[AVMEDIA_TYPE_VIDEO], -1, NULL, 0);
    if (!audio_disable)
        st_index[AVMEDIA_TYPE_AUDIO] =
            av_find_best_stream(ic, AVMEDIA_TYPE_AUDIO,
                                wanted_stream[AVMEDIA_TYPE_AUDIO],
                                st_index[AVMEDIA_TYPE_VIDEO],
                                NULL, 0);
    if (!video_disable)
        st_index[AVMEDIA_TYPE_SUBTITLE] =
            av_find_best_stream(ic, AVMEDIA_TYPE_SUBTITLE,
                                wanted_stream[AVMEDIA_TYPE_SUBTITLE],
                                (st_index[AVMEDIA_TYPE_AUDIO] >= 0 ?
                                 st_index[AVMEDIA_TYPE_AUDIO] :
                                 st_index[AVMEDIA_TYPE_VIDEO]),
                                NULL, 0);
    if (show_status) {
        av_dump_format(ic, 0, is->filename, 0);
    }

    /* open the streams */
    if (st_index[AVMEDIA_TYPE_AUDIO] >= 0) {
        stream_component_open(is, st_index[AVMEDIA_TYPE_AUDIO]);
    }

    ret = -1;
    if (st_index[AVMEDIA_TYPE_VIDEO] >= 0) {
        ret = stream_component_open(is, st_index[AVMEDIA_TYPE_VIDEO]);
    }
    is->refresh_tid = SDL_CreateThread(refresh_thread, is);
    if (ret < 0) {
        if (!display_disable)
            is->show_audio = 2;
    }

    if (st_index[AVMEDIA_TYPE_SUBTITLE] >= 0) {
        stream_component_open(is, st_index[AVMEDIA_TYPE_SUBTITLE]);
    }

    if (is->video_stream < 0 && is->audio_stream < 0) {
        fprintf(stderr, "%s: could not open codecs\n", is->filename);
        ret = -1;
        goto fail;
    }

    for (;;) {
        if (is->abort_request)
            break;
        if (is->paused != is->last_paused) {
            is->last_paused = is->paused;
            if (is->paused)
                is->read_pause_return = av_read_pause(ic);
            else
                av_read_play(ic);
        }
#if CONFIG_RTSP_DEMUXER
        if (is->paused && !strcmp(ic->iformat->name, "rtsp")) {
            /* wait 10 ms to avoid trying to get another packet */
            /* XXX: horrible */
            SDL_Delay(10);
            continue;
        }
#endif
        if (is->seek_req) {
            int64_t seek_target = is->seek_pos;
            int64_t seek_min    = is->seek_rel > 0 ? seek_target - is->seek_rel + 2: INT64_MIN;
            int64_t seek_max    = is->seek_rel < 0 ? seek_target - is->seek_rel - 2: INT64_MAX;
// FIXME the +-2 is due to rounding being not done in the correct direction in generation
//      of the seek_pos/seek_rel variables

            ret = avformat_seek_file(is->ic, -1, seek_min, seek_target, seek_max, is->seek_flags);
            if (ret < 0) {
                fprintf(stderr, "%s: error while seeking\n", is->ic->filename);
            } else {
                if (is->audio_stream >= 0) {
                    packet_queue_flush(&is->audioq);
                    packet_queue_put(&is->audioq, &flush_pkt);
                }
                if (is->subtitle_stream >= 0) {
                    packet_queue_flush(&is->subtitleq);
                    packet_queue_put(&is->subtitleq, &flush_pkt);
                }
                if (is->video_stream >= 0) {
                    packet_queue_flush(&is->videoq);
                    packet_queue_put(&is->videoq, &flush_pkt);
                }
            }
            is->seek_req = 0;
            eof = 0;
        }

        /* if the queue are full, no need to read more */
        if (   is->audioq.size + is->videoq.size + is->subtitleq.size > MAX_QUEUE_SIZE
            || (   (is->audioq   .size  > MIN_AUDIOQ_SIZE || is->audio_stream < 0)
                && (is->videoq   .nb_packets > MIN_FRAMES || is->video_stream < 0)
                && (is->subtitleq.nb_packets > MIN_FRAMES || is->subtitle_stream < 0))) {
            /* wait 10 ms */
            SDL_Delay(10);
            continue;
        }
        if (eof) {
            if (is->video_stream >= 0) {
                av_init_packet(pkt);
                pkt->data = NULL;
                pkt->size = 0;
                pkt->stream_index = is->video_stream;
                packet_queue_put(&is->videoq, pkt);
            }
            if (is->audio_stream >= 0 &&
                is->audio_st->codec->codec->capabilities & CODEC_CAP_DELAY) {
                av_init_packet(pkt);
                pkt->data = NULL;
                pkt->size = 0;
                pkt->stream_index = is->audio_stream;
                packet_queue_put(&is->audioq, pkt);
            }
            SDL_Delay(10);
            if (is->audioq.size + is->videoq.size + is->subtitleq.size == 0) {
                if (loop != 1 && (!loop || --loop)) {
                    stream_seek(cur_stream, start_time != AV_NOPTS_VALUE ? start_time : 0, 0, 0);
                } else if (autoexit) {
                    ret = AVERROR_EOF;
                    goto fail;
                }
            }
            continue;
        }
        ret = av_read_frame(ic, pkt);
        if (ret < 0) {
            if (ret == AVERROR_EOF || (ic->pb && ic->pb->eof_reached))
                eof = 1;
            if (ic->pb && ic->pb->error)
                break;
            SDL_Delay(100); /* wait for user event */
            continue;
        }
        /* check if packet is in play range specified by user, then queue, otherwise discard */
        pkt_in_play_range = duration == AV_NOPTS_VALUE ||
                (pkt->pts - ic->streams[pkt->stream_index]->start_time) *
                av_q2d(ic->streams[pkt->stream_index]->time_base) -
                (double)(start_time != AV_NOPTS_VALUE ? start_time : 0) / 1000000
                <= ((double)duration / 1000000);
        if (pkt->stream_index == is->audio_stream && pkt_in_play_range) {
            packet_queue_put(&is->audioq, pkt);
        } else if (pkt->stream_index == is->video_stream && pkt_in_play_range) {
            packet_queue_put(&is->videoq, pkt);
        } else if (pkt->stream_index == is->subtitle_stream && pkt_in_play_range) {
            packet_queue_put(&is->subtitleq, pkt);
        } else {
            av_free_packet(pkt);
        }
    }
    /* wait until the end */
    while (!is->abort_request) {
        SDL_Delay(100);
    }

    ret = 0;
 fail:
    /* disable interrupting */
    global_video_state = NULL;

    /* close each stream */
    if (is->audio_stream >= 0)
        stream_component_close(is, is->audio_stream);
    if (is->video_stream >= 0)
        stream_component_close(is, is->video_stream);
    if (is->subtitle_stream >= 0)
        stream_component_close(is, is->subtitle_stream);
    if (is->ic) {
        avformat_close_input(&is->ic);
    }

    if (ret != 0) {
        SDL_Event event;

        event.type = FF_QUIT_EVENT;
        event.user.data1 = is;
        SDL_PushEvent(&event);
    }
    return 0;
}

static VideoState *stream_open(const char *filename, AVInputFormat *iformat)
{
    VideoState *is;

    is = av_mallocz(sizeof(VideoState));
    if (!is)
        return NULL;
    av_strlcpy(is->filename, filename, sizeof(is->filename));
    is->iformat = iformat;
    is->ytop    = 0;
    is->xleft   = 0;

    /* start video display */
    is->pictq_mutex = SDL_CreateMutex();
    is->pictq_cond  = SDL_CreateCond();

    is->subpq_mutex = SDL_CreateMutex();
    is->subpq_cond  = SDL_CreateCond();

    is->av_sync_type = av_sync_type;
    is->parse_tid    = SDL_CreateThread(decode_thread, is);
    if (!is->parse_tid) {
        av_free(is);
        return NULL;
    }
    return is;
}

static void stream_cycle_channel(VideoState *is, int codec_type)
{
    AVFormatContext *ic = is->ic;
    int start_index, stream_index;
    AVStream *st;

    if (codec_type == AVMEDIA_TYPE_VIDEO)
        start_index = is->video_stream;
    else if (codec_type == AVMEDIA_TYPE_AUDIO)
        start_index = is->audio_stream;
    else
        start_index = is->subtitle_stream;
    if (start_index < (codec_type == AVMEDIA_TYPE_SUBTITLE ? -1 : 0))
        return;
    stream_index = start_index;
    for (;;) {
        if (++stream_index >= is->ic->nb_streams)
        {
            if (codec_type == AVMEDIA_TYPE_SUBTITLE)
            {
                stream_index = -1;
                goto the_end;
            } else
                stream_index = 0;
        }
        if (stream_index == start_index)
            return;
        st = ic->streams[stream_index];
        if (st->codec->codec_type == codec_type) {
            /* check that parameters are OK */
            switch (codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                if (st->codec->sample_rate != 0 &&
                    st->codec->channels != 0)
                    goto the_end;
                break;
            case AVMEDIA_TYPE_VIDEO:
            case AVMEDIA_TYPE_SUBTITLE:
                goto the_end;
            default:
                break;
            }
        }
    }
 the_end:
    stream_component_close(is, start_index);
    stream_component_open(is, stream_index);
}


static void toggle_full_screen(void)
{
    is_full_screen = !is_full_screen;
#if defined(__APPLE__) && SDL_VERSION_ATLEAST(1, 2, 14)
    /* OS X needs to empty the picture_queue */
    for (int i = 0; i < VIDEO_PICTURE_QUEUE_SIZE; i++) {
        cur_stream->pictq[i].reallocate = 1;
    }
#endif
    video_open(cur_stream);
}

static void toggle_pause(void)
{
    if (cur_stream)
        stream_pause(cur_stream);
    step = 0;
}

static void step_to_next_frame(void)
{
    if (cur_stream) {
        /* if the stream is paused unpause it, then step */
        if (cur_stream->paused)
            stream_pause(cur_stream);
    }
    step = 1;
}

static void toggle_audio_display(void)
{
    if (cur_stream) {
        int bgcolor = SDL_MapRGB(screen->format, 0x00, 0x00, 0x00);
        cur_stream->show_audio = (cur_stream->show_audio + 1) % 3;
        fill_rectangle(screen,
                       cur_stream->xleft, cur_stream->ytop, cur_stream->width, cur_stream->height,
                       bgcolor);
        SDL_UpdateRect(screen, cur_stream->xleft, cur_stream->ytop, cur_stream->width, cur_stream->height);
    }
}

/* handle an event sent by the GUI */
static void event_loop(void)
{
    SDL_Event event;
    double incr, pos, frac;

    for (;;) {
        double x;
        SDL_WaitEvent(&event);
        switch (event.type) {
        case SDL_KEYDOWN:
            if (exit_on_keydown) {
                do_exit();
                break;
            }
            switch (event.key.keysym.sym) {
            case SDLK_ESCAPE:
            case SDLK_q:
                do_exit();
                break;
            case SDLK_f:
                toggle_full_screen();
                break;
            case SDLK_p:
            case SDLK_SPACE:
                toggle_pause();
                break;
            case SDLK_s: // S: Step to next frame
                step_to_next_frame();
                break;
            case SDLK_a:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, AVMEDIA_TYPE_AUDIO);
                break;
            case SDLK_v:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, AVMEDIA_TYPE_VIDEO);
                break;
            case SDLK_t:
                if (cur_stream)
                    stream_cycle_channel(cur_stream, AVMEDIA_TYPE_SUBTITLE);
                break;
            case SDLK_w:
                toggle_audio_display();
                break;
            case SDLK_LEFT:
                incr = -10.0;
                goto do_seek;
            case SDLK_RIGHT:
                incr = 10.0;
                goto do_seek;
            case SDLK_UP:
                incr = 60.0;
                goto do_seek;
            case SDLK_DOWN:
                incr = -60.0;
            do_seek:
                if (cur_stream) {
                    if (seek_by_bytes) {
                        if (cur_stream->video_stream >= 0 && cur_stream->video_current_pos >= 0) {
                            pos = cur_stream->video_current_pos;
                        } else if (cur_stream->audio_stream >= 0 && cur_stream->audio_pkt.pos >= 0) {
                            pos = cur_stream->audio_pkt.pos;
                        } else
                            pos = avio_tell(cur_stream->ic->pb);
                        if (cur_stream->ic->bit_rate)
                            incr *= cur_stream->ic->bit_rate / 8.0;
                        else
                            incr *= 180000.0;
                        pos += incr;
                        stream_seek(cur_stream, pos, incr, 1);
                    } else {
                        pos = get_master_clock(cur_stream);
                        pos += incr;
                        stream_seek(cur_stream, (int64_t)(pos * AV_TIME_BASE), (int64_t)(incr * AV_TIME_BASE), 0);
                    }
                }
                break;
            default:
                break;
            }
            break;
        case SDL_MOUSEBUTTONDOWN:
            if (exit_on_mousedown) {
                do_exit();
                break;
            }
        case SDL_MOUSEMOTION:
            if (event.type == SDL_MOUSEBUTTONDOWN) {
                x = event.button.x;
            } else {
                if (event.motion.state != SDL_PRESSED)
                    break;
                x = event.motion.x;
            }
            if (cur_stream) {
                if (seek_by_bytes || cur_stream->ic->duration <= 0) {
                    uint64_t size =  avio_size(cur_stream->ic->pb);
                    stream_seek(cur_stream, size*x/cur_stream->width, 0, 1);
                } else {
                    int64_t ts;
                    int ns, hh, mm, ss;
                    int tns, thh, tmm, tss;
                    tns  = cur_stream->ic->duration / 1000000LL;
                    thh  = tns / 3600;
                    tmm  = (tns % 3600) / 60;
                    tss  = (tns % 60);
                    frac = x / cur_stream->width;
                    ns   = frac * tns;
                    hh   = ns / 3600;
                    mm   = (ns % 3600) / 60;
                    ss   = (ns % 60);
                    fprintf(stderr, "Seek to %2.0f%% (%2d:%02d:%02d) of total duration (%2d:%02d:%02d)       \n", frac*100,
                            hh, mm, ss, thh, tmm, tss);
                    ts = frac * cur_stream->ic->duration;
                    if (cur_stream->ic->start_time != AV_NOPTS_VALUE)
                        ts += cur_stream->ic->start_time;
                    stream_seek(cur_stream, ts, 0, 0);
                }
            }
            break;
        case SDL_VIDEORESIZE:
            if (cur_stream) {
                screen = SDL_SetVideoMode(event.resize.w, event.resize.h, 0,
                                          SDL_HWSURFACE|SDL_RESIZABLE|SDL_ASYNCBLIT|SDL_HWACCEL);
                screen_width  = cur_stream->width  = event.resize.w;
                screen_height = cur_stream->height = event.resize.h;
            }
            break;
        case SDL_QUIT:
        case FF_QUIT_EVENT:
            do_exit();
            break;
        case FF_ALLOC_EVENT:
            video_open(event.user.data1);
            alloc_picture(event.user.data1);
            break;
        case FF_REFRESH_EVENT:
            video_refresh_timer(event.user.data1);
            cur_stream->refresh = 0;
            break;
        default:
            break;
        }
    }
}

static int opt_frame_size(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_ERROR,
           "Option '%s' has been removed, use private format options instead\n", opt);
    return AVERROR(EINVAL);
}

static int opt_width(const char *opt, const char *arg)
{
    screen_width = parse_number_or_die(opt, arg, OPT_INT64, 1, INT_MAX);
    return 0;
}

static int opt_height(const char *opt, const char *arg)
{
    screen_height = parse_number_or_die(opt, arg, OPT_INT64, 1, INT_MAX);
    return 0;
}

static int opt_format(const char *opt, const char *arg)
{
    file_iformat = av_find_input_format(arg);
    if (!file_iformat) {
        fprintf(stderr, "Unknown input format: %s\n", arg);
        return AVERROR(EINVAL);
    }
    return 0;
}

static int opt_frame_pix_fmt(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_ERROR,
           "Option '%s' has been removed, use private format options instead\n", opt);
    return AVERROR(EINVAL);
}

static int opt_sync(const char *opt, const char *arg)
{
    if (!strcmp(arg, "audio"))
        av_sync_type = AV_SYNC_AUDIO_MASTER;
    else if (!strcmp(arg, "video"))
        av_sync_type = AV_SYNC_VIDEO_MASTER;
    else if (!strcmp(arg, "ext"))
        av_sync_type = AV_SYNC_EXTERNAL_CLOCK;
    else {
        fprintf(stderr, "Unknown value for %s: %s\n", opt, arg);
        exit(1);
    }
    return 0;
}

static int opt_seek(const char *opt, const char *arg)
{
    start_time = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_duration(const char *opt, const char *arg)
{
    duration = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_debug(const char *opt, const char *arg)
{
    av_log_set_level(99);
    debug = parse_number_or_die(opt, arg, OPT_INT64, 0, INT_MAX);
    return 0;
}

static int opt_vismv(const char *opt, const char *arg)
{
    debug_mv = parse_number_or_die(opt, arg, OPT_INT64, INT_MIN, INT_MAX);
    return 0;
}

static const OptionDef options[] = {
#include "cmdutils_common_opts.h"
    { "x", HAS_ARG, { (void*)opt_width }, "force displayed width", "width" },
    { "y", HAS_ARG, { (void*)opt_height }, "force displayed height", "height" },
    { "s", HAS_ARG | OPT_VIDEO, { (void*)opt_frame_size }, "set frame size (WxH or abbreviation)", "size" },
    { "fs", OPT_BOOL, { (void*)&is_full_screen }, "force full screen" },
    { "an", OPT_BOOL, { (void*)&audio_disable }, "disable audio" },
    { "vn", OPT_BOOL, { (void*)&video_disable }, "disable video" },
    { "ast", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&wanted_stream[AVMEDIA_TYPE_AUDIO] }, "select desired audio stream", "stream_number" },
    { "vst", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&wanted_stream[AVMEDIA_TYPE_VIDEO] }, "select desired video stream", "stream_number" },
    { "sst", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&wanted_stream[AVMEDIA_TYPE_SUBTITLE] }, "select desired subtitle stream", "stream_number" },
    { "ss", HAS_ARG, { (void*)&opt_seek }, "seek to a given position in seconds", "pos" },
    { "t", HAS_ARG, { (void*)&opt_duration }, "play  \"duration\" seconds of audio/video", "duration" },
    { "bytes", OPT_INT | HAS_ARG, { (void*)&seek_by_bytes }, "seek by bytes 0=off 1=on -1=auto", "val" },
    { "nodisp", OPT_BOOL, { (void*)&display_disable }, "disable graphical display" },
    { "f", HAS_ARG, { (void*)opt_format }, "force format", "fmt" },
    { "pix_fmt", HAS_ARG | OPT_EXPERT | OPT_VIDEO, { (void*)opt_frame_pix_fmt }, "set pixel format", "format" },
    { "stats", OPT_BOOL | OPT_EXPERT, { (void*)&show_status }, "show status", "" },
    { "debug", HAS_ARG | OPT_EXPERT, { (void*)opt_debug }, "print specific debug info", "" },
    { "bug", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&workaround_bugs }, "workaround bugs", "" },
    { "vismv", HAS_ARG | OPT_EXPERT, { (void*)opt_vismv }, "visualize motion vectors", "" },
    { "fast", OPT_BOOL | OPT_EXPERT, { (void*)&fast }, "non spec compliant optimizations", "" },
    { "genpts", OPT_BOOL | OPT_EXPERT, { (void*)&genpts }, "generate pts", "" },
    { "drp", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&decoder_reorder_pts }, "let decoder reorder pts 0=off 1=on -1=auto", ""},
    { "skiploop", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_loop_filter }, "", "" },
    { "skipframe", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_frame }, "", "" },
    { "skipidct", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&skip_idct }, "", "" },
    { "idct", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&idct }, "set idct algo",  "algo" },
    { "ec", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&error_concealment }, "set error concealment options",  "bit_mask" },
    { "sync", HAS_ARG | OPT_EXPERT, { (void*)opt_sync }, "set audio-video sync. type (type=audio/video/ext)", "type" },
    { "autoexit", OPT_BOOL | OPT_EXPERT, { (void*)&autoexit }, "exit at the end", "" },
    { "exitonkeydown", OPT_BOOL | OPT_EXPERT, { (void*)&exit_on_keydown }, "exit on key down", "" },
    { "exitonmousedown", OPT_BOOL | OPT_EXPERT, { (void*)&exit_on_mousedown }, "exit on mouse down", "" },
    { "loop", OPT_INT | HAS_ARG | OPT_EXPERT, { (void*)&loop }, "set number of times the playback shall be looped", "loop count" },
    { "framedrop", OPT_BOOL | OPT_EXPERT, { (void*)&framedrop }, "drop frames when cpu is too slow", "" },
    { "window_title", OPT_STRING | HAS_ARG, { (void*)&window_title }, "set window title", "window title" },
#if CONFIG_AVFILTER
    { "vf", OPT_STRING | HAS_ARG, { (void*)&vfilters }, "video filters", "filter list" },
#endif
    { "rdftspeed", OPT_INT | HAS_ARG| OPT_AUDIO | OPT_EXPERT, { (void*)&rdftspeed }, "rdft speed", "msecs" },
    { "default", HAS_ARG | OPT_AUDIO | OPT_VIDEO | OPT_EXPERT, { (void*)opt_default }, "generic catch all option", "" },
    { "i", 0, { NULL }, "avconv compatibility dummy option", ""},
    { NULL, },
};

static void show_usage(void)
{
    printf("Simple media player\n");
    printf("usage: %s [options] input_file\n", program_name);
    printf("\n");
}

static void show_help(void)
{
    av_log_set_callback(log_callback_help);
    show_usage();
    show_help_options(options, "Main options:\n",
                      OPT_EXPERT, 0);
    show_help_options(options, "\nAdvanced options:\n",
                      OPT_EXPERT, OPT_EXPERT);
    printf("\n");
    show_help_children(avcodec_get_class(), AV_OPT_FLAG_DECODING_PARAM);
    show_help_children(avformat_get_class(), AV_OPT_FLAG_DECODING_PARAM);
#if !CONFIG_AVFILTER
    show_help_children(sws_get_class(), AV_OPT_FLAG_ENCODING_PARAM);
#endif
    printf("\nWhile playing:\n"
           "q, ESC              quit\n"
           "f                   toggle full screen\n"
           "p, SPC              pause\n"
           "a                   cycle audio channel\n"
           "v                   cycle video channel\n"
           "t                   cycle subtitle channel\n"
           "w                   show audio waves\n"
           "s                   activate frame-step mode\n"
           "left/right          seek backward/forward 10 seconds\n"
           "down/up             seek backward/forward 1 minute\n"
           "mouse click         seek to percentage in file corresponding to fraction of width\n"
           );
}

static void opt_input_file(void *optctx, const char *filename)
{
    if (input_filename) {
        fprintf(stderr, "Argument '%s' provided as input filename, but '%s' was already specified.\n",
                filename, input_filename);
        exit(1);
    }
    if (!strcmp(filename, "-"))
        filename = "pipe:";
    input_filename = filename;
}

/* Called from the main */
int main(int argc, char **argv)
{
    int flags;

    av_log_set_flags(AV_LOG_SKIP_REPEATED);
    parse_loglevel(argc, argv, options);

    /* register all codecs, demux and protocols */
    avcodec_register_all();
#if CONFIG_AVDEVICE
    avdevice_register_all();
#endif
#if CONFIG_AVFILTER
    avfilter_register_all();
#endif
    av_register_all();
    avformat_network_init();

    init_opts();

    show_banner();

    parse_options(NULL, argc, argv, options, opt_input_file);

    if (!input_filename) {
        show_usage();
        fprintf(stderr, "An input file must be specified\n");
        fprintf(stderr, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
        exit(1);
    }

    if (display_disable) {
        video_disable = 1;
    }
    flags = SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER;
#if !defined(__MINGW32__) && !defined(__APPLE__)
    flags |= SDL_INIT_EVENTTHREAD; /* Not supported on Windows or Mac OS X */
#endif
    if (SDL_Init (flags)) {
        fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());
        exit(1);
    }

    if (!display_disable) {
#if HAVE_SDL_VIDEO_SIZE
        const SDL_VideoInfo *vi = SDL_GetVideoInfo();
        fs_screen_width = vi->current_w;
        fs_screen_height = vi->current_h;
#endif
    }

    SDL_EventState(SDL_ACTIVEEVENT, SDL_IGNORE);
    SDL_EventState(SDL_SYSWMEVENT, SDL_IGNORE);
    SDL_EventState(SDL_USEREVENT, SDL_IGNORE);

    av_init_packet(&flush_pkt);
    flush_pkt.data = "FLUSH";

    cur_stream = stream_open(input_filename, file_iformat);

    event_loop();

    /* never returns */

    return 0;
}