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- /*
- * MPEG2 transport stream (aka DVB) demuxer
- * Copyright (c) 2002-2003 Fabrice Bellard
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- //#define USE_SYNCPOINT_SEARCH
- #include "libavutil/crc.h"
- #include "libavutil/intreadwrite.h"
- #include "libavutil/log.h"
- #include "libavutil/dict.h"
- #include "libavutil/mathematics.h"
- #include "libavutil/opt.h"
- #include "libavutil/avassert.h"
- #include "libavcodec/bytestream.h"
- #include "libavcodec/get_bits.h"
- #include "avformat.h"
- #include "mpegts.h"
- #include "internal.h"
- #include "avio_internal.h"
- #include "seek.h"
- #include "mpeg.h"
- #include "isom.h"
- /* maximum size in which we look for synchronisation if
- synchronisation is lost */
- #define MAX_RESYNC_SIZE 65536
- #define MAX_PES_PAYLOAD 200*1024
- #define MAX_MP4_DESCR_COUNT 16
- enum MpegTSFilterType {
- MPEGTS_PES,
- MPEGTS_SECTION,
- };
- typedef struct MpegTSFilter MpegTSFilter;
- typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
- typedef struct MpegTSPESFilter {
- PESCallback *pes_cb;
- void *opaque;
- } MpegTSPESFilter;
- typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
- typedef void SetServiceCallback(void *opaque, int ret);
- typedef struct MpegTSSectionFilter {
- int section_index;
- int section_h_size;
- uint8_t *section_buf;
- unsigned int check_crc:1;
- unsigned int end_of_section_reached:1;
- SectionCallback *section_cb;
- void *opaque;
- } MpegTSSectionFilter;
- struct MpegTSFilter {
- int pid;
- int es_id;
- int last_cc; /* last cc code (-1 if first packet) */
- enum MpegTSFilterType type;
- union {
- MpegTSPESFilter pes_filter;
- MpegTSSectionFilter section_filter;
- } u;
- };
- #define MAX_PIDS_PER_PROGRAM 64
- struct Program {
- unsigned int id; //program id/service id
- unsigned int nb_pids;
- unsigned int pids[MAX_PIDS_PER_PROGRAM];
- };
- struct MpegTSContext {
- const AVClass *class;
- /* user data */
- AVFormatContext *stream;
- /** raw packet size, including FEC if present */
- int raw_packet_size;
- int pos47;
- /** if true, all pids are analyzed to find streams */
- int auto_guess;
- /** compute exact PCR for each transport stream packet */
- int mpeg2ts_compute_pcr;
- int64_t cur_pcr; /**< used to estimate the exact PCR */
- int pcr_incr; /**< used to estimate the exact PCR */
- /* data needed to handle file based ts */
- /** stop parsing loop */
- int stop_parse;
- /** packet containing Audio/Video data */
- AVPacket *pkt;
- /** to detect seek */
- int64_t last_pos;
- /******************************************/
- /* private mpegts data */
- /* scan context */
- /** structure to keep track of Program->pids mapping */
- unsigned int nb_prg;
- struct Program *prg;
- /** filters for various streams specified by PMT + for the PAT and PMT */
- MpegTSFilter *pids[NB_PID_MAX];
- };
- static const AVOption options[] = {
- {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
- {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
- { NULL },
- };
- static const AVClass mpegtsraw_class = {
- .class_name = "mpegtsraw demuxer",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
- };
- /* TS stream handling */
- enum MpegTSState {
- MPEGTS_HEADER = 0,
- MPEGTS_PESHEADER,
- MPEGTS_PESHEADER_FILL,
- MPEGTS_PAYLOAD,
- MPEGTS_SKIP,
- };
- /* enough for PES header + length */
- #define PES_START_SIZE 6
- #define PES_HEADER_SIZE 9
- #define MAX_PES_HEADER_SIZE (9 + 255)
- typedef struct PESContext {
- int pid;
- int pcr_pid; /**< if -1 then all packets containing PCR are considered */
- int stream_type;
- MpegTSContext *ts;
- AVFormatContext *stream;
- AVStream *st;
- AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
- enum MpegTSState state;
- /* used to get the format */
- int data_index;
- int flags; /**< copied to the AVPacket flags */
- int total_size;
- int pes_header_size;
- int extended_stream_id;
- int64_t pts, dts;
- int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
- uint8_t header[MAX_PES_HEADER_SIZE];
- uint8_t *buffer;
- SLConfigDescr sl;
- } PESContext;
- extern AVInputFormat ff_mpegts_demuxer;
- static void clear_program(MpegTSContext *ts, unsigned int programid)
- {
- int i;
- for(i=0; i<ts->nb_prg; i++)
- if(ts->prg[i].id == programid)
- ts->prg[i].nb_pids = 0;
- }
- static void clear_programs(MpegTSContext *ts)
- {
- av_freep(&ts->prg);
- ts->nb_prg=0;
- }
- static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
- {
- struct Program *p;
- void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
- if(!tmp)
- return;
- ts->prg = tmp;
- p = &ts->prg[ts->nb_prg];
- p->id = programid;
- p->nb_pids = 0;
- ts->nb_prg++;
- }
- static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
- {
- int i;
- struct Program *p = NULL;
- for(i=0; i<ts->nb_prg; i++) {
- if(ts->prg[i].id == programid) {
- p = &ts->prg[i];
- break;
- }
- }
- if(!p)
- return;
- if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
- return;
- p->pids[p->nb_pids++] = pid;
- }
- static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
- {
- int i;
- for(i=0; i<s->nb_programs; i++) {
- if(s->programs[i]->id == programid) {
- s->programs[i]->pcr_pid = pid;
- break;
- }
- }
- }
- /**
- * @brief discard_pid() decides if the pid is to be discarded according
- * to caller's programs selection
- * @param ts : - TS context
- * @param pid : - pid
- * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
- * 0 otherwise
- */
- static int discard_pid(MpegTSContext *ts, unsigned int pid)
- {
- int i, j, k;
- int used = 0, discarded = 0;
- struct Program *p;
- for(i=0; i<ts->nb_prg; i++) {
- p = &ts->prg[i];
- for(j=0; j<p->nb_pids; j++) {
- if(p->pids[j] != pid)
- continue;
- //is program with id p->id set to be discarded?
- for(k=0; k<ts->stream->nb_programs; k++) {
- if(ts->stream->programs[k]->id == p->id) {
- if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
- discarded++;
- else
- used++;
- }
- }
- }
- }
- return !used && discarded;
- }
- /**
- * Assemble PES packets out of TS packets, and then call the "section_cb"
- * function when they are complete.
- */
- static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
- const uint8_t *buf, int buf_size, int is_start)
- {
- MpegTSSectionFilter *tss = &tss1->u.section_filter;
- int len;
- if (is_start) {
- memcpy(tss->section_buf, buf, buf_size);
- tss->section_index = buf_size;
- tss->section_h_size = -1;
- tss->end_of_section_reached = 0;
- } else {
- if (tss->end_of_section_reached)
- return;
- len = 4096 - tss->section_index;
- if (buf_size < len)
- len = buf_size;
- memcpy(tss->section_buf + tss->section_index, buf, len);
- tss->section_index += len;
- }
- /* compute section length if possible */
- if (tss->section_h_size == -1 && tss->section_index >= 3) {
- len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
- if (len > 4096)
- return;
- tss->section_h_size = len;
- }
- if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
- tss->end_of_section_reached = 1;
- if (!tss->check_crc ||
- av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
- tss->section_buf, tss->section_h_size) == 0)
- tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
- }
- }
- static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
- SectionCallback *section_cb, void *opaque,
- int check_crc)
- {
- MpegTSFilter *filter;
- MpegTSSectionFilter *sec;
- av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
- if (pid >= NB_PID_MAX || ts->pids[pid])
- return NULL;
- filter = av_mallocz(sizeof(MpegTSFilter));
- if (!filter)
- return NULL;
- ts->pids[pid] = filter;
- filter->type = MPEGTS_SECTION;
- filter->pid = pid;
- filter->es_id = -1;
- filter->last_cc = -1;
- sec = &filter->u.section_filter;
- sec->section_cb = section_cb;
- sec->opaque = opaque;
- sec->section_buf = av_malloc(MAX_SECTION_SIZE);
- sec->check_crc = check_crc;
- if (!sec->section_buf) {
- av_free(filter);
- return NULL;
- }
- return filter;
- }
- static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
- PESCallback *pes_cb,
- void *opaque)
- {
- MpegTSFilter *filter;
- MpegTSPESFilter *pes;
- if (pid >= NB_PID_MAX || ts->pids[pid])
- return NULL;
- filter = av_mallocz(sizeof(MpegTSFilter));
- if (!filter)
- return NULL;
- ts->pids[pid] = filter;
- filter->type = MPEGTS_PES;
- filter->pid = pid;
- filter->es_id = -1;
- filter->last_cc = -1;
- pes = &filter->u.pes_filter;
- pes->pes_cb = pes_cb;
- pes->opaque = opaque;
- return filter;
- }
- static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
- {
- int pid;
- pid = filter->pid;
- if (filter->type == MPEGTS_SECTION)
- av_freep(&filter->u.section_filter.section_buf);
- else if (filter->type == MPEGTS_PES) {
- PESContext *pes = filter->u.pes_filter.opaque;
- av_freep(&pes->buffer);
- /* referenced private data will be freed later in
- * avformat_close_input */
- if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
- av_freep(&filter->u.pes_filter.opaque);
- }
- }
- av_free(filter);
- ts->pids[pid] = NULL;
- }
- static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
- int stat[TS_MAX_PACKET_SIZE];
- int i;
- int x=0;
- int best_score=0;
- memset(stat, 0, packet_size*sizeof(int));
- for(x=i=0; i<size-3; i++){
- if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
- stat[x]++;
- if(stat[x] > best_score){
- best_score= stat[x];
- if(index) *index= x;
- }
- }
- x++;
- if(x == packet_size) x= 0;
- }
- return best_score;
- }
- /* autodetect fec presence. Must have at least 1024 bytes */
- static int get_packet_size(const uint8_t *buf, int size)
- {
- int score, fec_score, dvhs_score;
- if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
- return -1;
- score = analyze(buf, size, TS_PACKET_SIZE, NULL);
- dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
- fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
- // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
- if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
- else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
- else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
- else return -1;
- }
- typedef struct SectionHeader {
- uint8_t tid;
- uint16_t id;
- uint8_t version;
- uint8_t sec_num;
- uint8_t last_sec_num;
- } SectionHeader;
- static inline int get8(const uint8_t **pp, const uint8_t *p_end)
- {
- const uint8_t *p;
- int c;
- p = *pp;
- if (p >= p_end)
- return -1;
- c = *p++;
- *pp = p;
- return c;
- }
- static inline int get16(const uint8_t **pp, const uint8_t *p_end)
- {
- const uint8_t *p;
- int c;
- p = *pp;
- if ((p + 1) >= p_end)
- return -1;
- c = AV_RB16(p);
- p += 2;
- *pp = p;
- return c;
- }
- /* read and allocate a DVB string preceded by its length */
- static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
- {
- int len;
- const uint8_t *p;
- char *str;
- p = *pp;
- len = get8(&p, p_end);
- if (len < 0)
- return NULL;
- if ((p + len) > p_end)
- return NULL;
- str = av_malloc(len + 1);
- if (!str)
- return NULL;
- memcpy(str, p, len);
- str[len] = '\0';
- p += len;
- *pp = p;
- return str;
- }
- static int parse_section_header(SectionHeader *h,
- const uint8_t **pp, const uint8_t *p_end)
- {
- int val;
- val = get8(pp, p_end);
- if (val < 0)
- return -1;
- h->tid = val;
- *pp += 2;
- val = get16(pp, p_end);
- if (val < 0)
- return -1;
- h->id = val;
- val = get8(pp, p_end);
- if (val < 0)
- return -1;
- h->version = (val >> 1) & 0x1f;
- val = get8(pp, p_end);
- if (val < 0)
- return -1;
- h->sec_num = val;
- val = get8(pp, p_end);
- if (val < 0)
- return -1;
- h->last_sec_num = val;
- return 0;
- }
- typedef struct {
- uint32_t stream_type;
- enum AVMediaType codec_type;
- enum CodecID codec_id;
- } StreamType;
- static const StreamType ISO_types[] = {
- { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
- { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
- { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
- { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
- { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
- { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
- /* Makito encoder sets stream type 0x11 for AAC,
- * so auto-detect LOAS/LATM instead of hardcoding it. */
- // { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
- { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
- { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
- { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
- { 0 },
- };
- static const StreamType HDMV_types[] = {
- { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
- { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
- { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
- { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
- { 0x85, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD */
- { 0x86, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS HD MASTER*/
- { 0xa1, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
- { 0xa2, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, /* DTS Express Secondary Audio */
- { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
- { 0 },
- };
- /* ATSC ? */
- static const StreamType MISC_types[] = {
- { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
- { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { 0 },
- };
- static const StreamType REGD_types[] = {
- { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
- { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
- { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
- { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
- { 0 },
- };
- /* descriptor present */
- static const StreamType DESC_types[] = {
- { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
- { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
- { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
- { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
- { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
- { 0 },
- };
- static void mpegts_find_stream_type(AVStream *st,
- uint32_t stream_type, const StreamType *types)
- {
- for (; types->stream_type; types++) {
- if (stream_type == types->stream_type) {
- st->codec->codec_type = types->codec_type;
- st->codec->codec_id = types->codec_id;
- st->request_probe = 0;
- return;
- }
- }
- }
- static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
- uint32_t stream_type, uint32_t prog_reg_desc)
- {
- int old_codec_type= st->codec->codec_type;
- int old_codec_id = st->codec->codec_id;
- avpriv_set_pts_info(st, 33, 1, 90000);
- st->priv_data = pes;
- st->codec->codec_type = AVMEDIA_TYPE_DATA;
- st->codec->codec_id = CODEC_ID_NONE;
- st->need_parsing = AVSTREAM_PARSE_FULL;
- pes->st = st;
- pes->stream_type = stream_type;
- av_log(pes->stream, AV_LOG_DEBUG,
- "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
- st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
- st->codec->codec_tag = pes->stream_type;
- mpegts_find_stream_type(st, pes->stream_type, ISO_types);
- if ((prog_reg_desc == AV_RL32("HDMV") ||
- prog_reg_desc == AV_RL32("HDPR")) &&
- st->codec->codec_id == CODEC_ID_NONE) {
- mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
- if (pes->stream_type == 0x83) {
- // HDMV TrueHD streams also contain an AC3 coded version of the
- // audio track - add a second stream for this
- AVStream *sub_st;
- // priv_data cannot be shared between streams
- PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
- if (!sub_pes)
- return AVERROR(ENOMEM);
- memcpy(sub_pes, pes, sizeof(*sub_pes));
- sub_st = avformat_new_stream(pes->stream, NULL);
- if (!sub_st) {
- av_free(sub_pes);
- return AVERROR(ENOMEM);
- }
- sub_st->id = pes->pid;
- avpriv_set_pts_info(sub_st, 33, 1, 90000);
- sub_st->priv_data = sub_pes;
- sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- sub_st->codec->codec_id = CODEC_ID_AC3;
- sub_st->need_parsing = AVSTREAM_PARSE_FULL;
- sub_pes->sub_st = pes->sub_st = sub_st;
- }
- }
- if (st->codec->codec_id == CODEC_ID_NONE)
- mpegts_find_stream_type(st, pes->stream_type, MISC_types);
- if (st->codec->codec_id == CODEC_ID_NONE){
- st->codec->codec_id = old_codec_id;
- st->codec->codec_type= old_codec_type;
- }
- return 0;
- }
- static void new_pes_packet(PESContext *pes, AVPacket *pkt)
- {
- av_init_packet(pkt);
- pkt->destruct = av_destruct_packet;
- pkt->data = pes->buffer;
- pkt->size = pes->data_index;
- if(pes->total_size != MAX_PES_PAYLOAD &&
- pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
- av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
- pes->flags |= AV_PKT_FLAG_CORRUPT;
- }
- memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
- // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
- if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
- pkt->stream_index = pes->sub_st->index;
- else
- pkt->stream_index = pes->st->index;
- pkt->pts = pes->pts;
- pkt->dts = pes->dts;
- /* store position of first TS packet of this PES packet */
- pkt->pos = pes->ts_packet_pos;
- pkt->flags = pes->flags;
- /* reset pts values */
- pes->pts = AV_NOPTS_VALUE;
- pes->dts = AV_NOPTS_VALUE;
- pes->buffer = NULL;
- pes->data_index = 0;
- pes->flags = 0;
- }
- static uint64_t get_bits64(GetBitContext *gb, int bits)
- {
- uint64_t ret = 0;
- while (bits > 17) {
- ret <<= 17;
- ret |= get_bits(gb, 17);
- bits -= 17;
- }
- ret <<= bits;
- ret |= get_bits(gb, bits);
- return ret;
- }
- static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
- {
- GetBitContext gb;
- int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
- int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
- int dts_flag = -1, cts_flag = -1;
- int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
- init_get_bits(&gb, buf, buf_size*8);
- if (sl->use_au_start)
- au_start_flag = get_bits1(&gb);
- if (sl->use_au_end)
- au_end_flag = get_bits1(&gb);
- if (!sl->use_au_start && !sl->use_au_end)
- au_start_flag = au_end_flag = 1;
- if (sl->ocr_len > 0)
- ocr_flag = get_bits1(&gb);
- if (sl->use_idle)
- idle_flag = get_bits1(&gb);
- if (sl->use_padding)
- padding_flag = get_bits1(&gb);
- if (padding_flag)
- padding_bits = get_bits(&gb, 3);
- if (!idle_flag && (!padding_flag || padding_bits != 0)) {
- if (sl->packet_seq_num_len)
- skip_bits_long(&gb, sl->packet_seq_num_len);
- if (sl->degr_prior_len)
- if (get_bits1(&gb))
- skip_bits(&gb, sl->degr_prior_len);
- if (ocr_flag)
- skip_bits_long(&gb, sl->ocr_len);
- if (au_start_flag) {
- if (sl->use_rand_acc_pt)
- get_bits1(&gb);
- if (sl->au_seq_num_len > 0)
- skip_bits_long(&gb, sl->au_seq_num_len);
- if (sl->use_timestamps) {
- dts_flag = get_bits1(&gb);
- cts_flag = get_bits1(&gb);
- }
- }
- if (sl->inst_bitrate_len)
- inst_bitrate_flag = get_bits1(&gb);
- if (dts_flag == 1)
- dts = get_bits64(&gb, sl->timestamp_len);
- if (cts_flag == 1)
- cts = get_bits64(&gb, sl->timestamp_len);
- if (sl->au_len > 0)
- skip_bits_long(&gb, sl->au_len);
- if (inst_bitrate_flag)
- skip_bits_long(&gb, sl->inst_bitrate_len);
- }
- if (dts != AV_NOPTS_VALUE)
- pes->dts = dts;
- if (cts != AV_NOPTS_VALUE)
- pes->pts = cts;
- if (sl->timestamp_len && sl->timestamp_res)
- avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
- return (get_bits_count(&gb) + 7) >> 3;
- }
- /* return non zero if a packet could be constructed */
- static int mpegts_push_data(MpegTSFilter *filter,
- const uint8_t *buf, int buf_size, int is_start,
- int64_t pos)
- {
- PESContext *pes = filter->u.pes_filter.opaque;
- MpegTSContext *ts = pes->ts;
- const uint8_t *p;
- int len, code;
- if(!ts->pkt)
- return 0;
- if (is_start) {
- if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
- new_pes_packet(pes, ts->pkt);
- ts->stop_parse = 1;
- }
- pes->state = MPEGTS_HEADER;
- pes->data_index = 0;
- pes->ts_packet_pos = pos;
- }
- p = buf;
- while (buf_size > 0) {
- switch(pes->state) {
- case MPEGTS_HEADER:
- len = PES_START_SIZE - pes->data_index;
- if (len > buf_size)
- len = buf_size;
- memcpy(pes->header + pes->data_index, p, len);
- pes->data_index += len;
- p += len;
- buf_size -= len;
- if (pes->data_index == PES_START_SIZE) {
- /* we got all the PES or section header. We can now
- decide */
- if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
- pes->header[2] == 0x01) {
- /* it must be an mpeg2 PES stream */
- code = pes->header[3] | 0x100;
- av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
- if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
- code == 0x1be) /* padding_stream */
- goto skip;
- /* stream not present in PMT */
- if (!pes->st) {
- pes->st = avformat_new_stream(ts->stream, NULL);
- if (!pes->st)
- return AVERROR(ENOMEM);
- pes->st->id = pes->pid;
- mpegts_set_stream_info(pes->st, pes, 0, 0);
- }
- pes->total_size = AV_RB16(pes->header + 4);
- /* NOTE: a zero total size means the PES size is
- unbounded */
- if (!pes->total_size)
- pes->total_size = MAX_PES_PAYLOAD;
- /* allocate pes buffer */
- pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
- if (!pes->buffer)
- return AVERROR(ENOMEM);
- if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
- code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
- code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
- code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
- pes->state = MPEGTS_PESHEADER;
- if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) {
- av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
- pes->pid, pes->stream_type);
- pes->st->request_probe= 1;
- }
- } else {
- pes->state = MPEGTS_PAYLOAD;
- pes->data_index = 0;
- }
- } else {
- /* otherwise, it should be a table */
- /* skip packet */
- skip:
- pes->state = MPEGTS_SKIP;
- continue;
- }
- }
- break;
- /**********************************************/
- /* PES packing parsing */
- case MPEGTS_PESHEADER:
- len = PES_HEADER_SIZE - pes->data_index;
- if (len < 0)
- return -1;
- if (len > buf_size)
- len = buf_size;
- memcpy(pes->header + pes->data_index, p, len);
- pes->data_index += len;
- p += len;
- buf_size -= len;
- if (pes->data_index == PES_HEADER_SIZE) {
- pes->pes_header_size = pes->header[8] + 9;
- pes->state = MPEGTS_PESHEADER_FILL;
- }
- break;
- case MPEGTS_PESHEADER_FILL:
- len = pes->pes_header_size - pes->data_index;
- if (len < 0)
- return -1;
- if (len > buf_size)
- len = buf_size;
- memcpy(pes->header + pes->data_index, p, len);
- pes->data_index += len;
- p += len;
- buf_size -= len;
- if (pes->data_index == pes->pes_header_size) {
- const uint8_t *r;
- unsigned int flags, pes_ext, skip;
- flags = pes->header[7];
- r = pes->header + 9;
- pes->pts = AV_NOPTS_VALUE;
- pes->dts = AV_NOPTS_VALUE;
- if ((flags & 0xc0) == 0x80) {
- pes->dts = pes->pts = ff_parse_pes_pts(r);
- r += 5;
- } else if ((flags & 0xc0) == 0xc0) {
- pes->pts = ff_parse_pes_pts(r);
- r += 5;
- pes->dts = ff_parse_pes_pts(r);
- r += 5;
- }
- pes->extended_stream_id = -1;
- if (flags & 0x01) { /* PES extension */
- pes_ext = *r++;
- /* Skip PES private data, program packet sequence counter and P-STD buffer */
- skip = (pes_ext >> 4) & 0xb;
- skip += skip & 0x9;
- r += skip;
- if ((pes_ext & 0x41) == 0x01 &&
- (r + 2) <= (pes->header + pes->pes_header_size)) {
- /* PES extension 2 */
- if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
- pes->extended_stream_id = r[1];
- }
- }
- /* we got the full header. We parse it and get the payload */
- pes->state = MPEGTS_PAYLOAD;
- pes->data_index = 0;
- if (pes->stream_type == 0x12 && buf_size > 0) {
- int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
- pes->pes_header_size += sl_header_bytes;
- p += sl_header_bytes;
- buf_size -= sl_header_bytes;
- }
- }
- break;
- case MPEGTS_PAYLOAD:
- if (buf_size > 0 && pes->buffer) {
- if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
- new_pes_packet(pes, ts->pkt);
- pes->total_size = MAX_PES_PAYLOAD;
- pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
- if (!pes->buffer)
- return AVERROR(ENOMEM);
- ts->stop_parse = 1;
- } else if (pes->data_index == 0 && buf_size > pes->total_size) {
- // pes packet size is < ts size packet and pes data is padded with 0xff
- // not sure if this is legal in ts but see issue #2392
- buf_size = pes->total_size;
- }
- memcpy(pes->buffer+pes->data_index, p, buf_size);
- pes->data_index += buf_size;
- }
- buf_size = 0;
- /* emit complete packets with known packet size
- * decreases demuxer delay for infrequent packets like subtitles from
- * a couple of seconds to milliseconds for properly muxed files.
- * total_size is the number of bytes following pes_packet_length
- * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
- if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
- pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
- ts->stop_parse = 1;
- new_pes_packet(pes, ts->pkt);
- }
- break;
- case MPEGTS_SKIP:
- buf_size = 0;
- break;
- }
- }
- return 0;
- }
- static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
- {
- MpegTSFilter *tss;
- PESContext *pes;
- /* if no pid found, then add a pid context */
- pes = av_mallocz(sizeof(PESContext));
- if (!pes)
- return 0;
- pes->ts = ts;
- pes->stream = ts->stream;
- pes->pid = pid;
- pes->pcr_pid = pcr_pid;
- pes->state = MPEGTS_SKIP;
- pes->pts = AV_NOPTS_VALUE;
- pes->dts = AV_NOPTS_VALUE;
- tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
- if (!tss) {
- av_free(pes);
- return 0;
- }
- return pes;
- }
- #define MAX_LEVEL 4
- typedef struct {
- AVFormatContext *s;
- AVIOContext pb;
- Mp4Descr *descr;
- Mp4Descr *active_descr;
- int descr_count;
- int max_descr_count;
- int level;
- } MP4DescrParseContext;
- static int init_MP4DescrParseContext(
- MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
- unsigned size, Mp4Descr *descr, int max_descr_count)
- {
- int ret;
- if (size > (1<<30))
- return AVERROR_INVALIDDATA;
- if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
- NULL, NULL, NULL, NULL)) < 0)
- return ret;
- d->s = s;
- d->level = 0;
- d->descr_count = 0;
- d->descr = descr;
- d->active_descr = NULL;
- d->max_descr_count = max_descr_count;
- return 0;
- }
- static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
- int64_t new_off = avio_tell(pb);
- (*len) -= new_off - *off;
- *off = new_off;
- }
- static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
- int target_tag);
- static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
- {
- while (len > 0) {
- if (parse_mp4_descr(d, off, len, 0) < 0)
- return -1;
- update_offsets(&d->pb, &off, &len);
- }
- return 0;
- }
- static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
- {
- avio_rb16(&d->pb); // ID
- avio_r8(&d->pb);
- avio_r8(&d->pb);
- avio_r8(&d->pb);
- avio_r8(&d->pb);
- avio_r8(&d->pb);
- update_offsets(&d->pb, &off, &len);
- return parse_mp4_descr_arr(d, off, len);
- }
- static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
- {
- int id_flags;
- if (len < 2)
- return 0;
- id_flags = avio_rb16(&d->pb);
- if (!(id_flags & 0x0020)) { //URL_Flag
- update_offsets(&d->pb, &off, &len);
- return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
- } else {
- return 0;
- }
- }
- static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
- {
- int es_id = 0;
- if (d->descr_count >= d->max_descr_count)
- return -1;
- ff_mp4_parse_es_descr(&d->pb, &es_id);
- d->active_descr = d->descr + (d->descr_count++);
- d->active_descr->es_id = es_id;
- update_offsets(&d->pb, &off, &len);
- parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
- update_offsets(&d->pb, &off, &len);
- if (len > 0)
- parse_mp4_descr(d, off, len, MP4SLDescrTag);
- d->active_descr = NULL;
- return 0;
- }
- static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
- {
- Mp4Descr *descr = d->active_descr;
- if (!descr)
- return -1;
- d->active_descr->dec_config_descr = av_malloc(len);
- if (!descr->dec_config_descr)
- return AVERROR(ENOMEM);
- descr->dec_config_descr_len = len;
- avio_read(&d->pb, descr->dec_config_descr, len);
- return 0;
- }
- static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
- {
- Mp4Descr *descr = d->active_descr;
- int predefined;
- if (!descr)
- return -1;
- predefined = avio_r8(&d->pb);
- if (!predefined) {
- int lengths;
- int flags = avio_r8(&d->pb);
- descr->sl.use_au_start = !!(flags & 0x80);
- descr->sl.use_au_end = !!(flags & 0x40);
- descr->sl.use_rand_acc_pt = !!(flags & 0x20);
- descr->sl.use_padding = !!(flags & 0x08);
- descr->sl.use_timestamps = !!(flags & 0x04);
- descr->sl.use_idle = !!(flags & 0x02);
- descr->sl.timestamp_res = avio_rb32(&d->pb);
- avio_rb32(&d->pb);
- descr->sl.timestamp_len = avio_r8(&d->pb);
- descr->sl.ocr_len = avio_r8(&d->pb);
- descr->sl.au_len = avio_r8(&d->pb);
- descr->sl.inst_bitrate_len = avio_r8(&d->pb);
- lengths = avio_rb16(&d->pb);
- descr->sl.degr_prior_len = lengths >> 12;
- descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
- descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
- } else {
- av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
- }
- return 0;
- }
- static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
- int target_tag) {
- int tag;
- int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
- update_offsets(&d->pb, &off, &len);
- if (len < 0 || len1 > len || len1 <= 0) {
- av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
- return -1;
- }
- if (d->level++ >= MAX_LEVEL) {
- av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
- goto done;
- }
- if (target_tag && tag != target_tag) {
- av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
- goto done;
- }
- switch (tag) {
- case MP4IODescrTag:
- parse_MP4IODescrTag(d, off, len1);
- break;
- case MP4ODescrTag:
- parse_MP4ODescrTag(d, off, len1);
- break;
- case MP4ESDescrTag:
- parse_MP4ESDescrTag(d, off, len1);
- break;
- case MP4DecConfigDescrTag:
- parse_MP4DecConfigDescrTag(d, off, len1);
- break;
- case MP4SLDescrTag:
- parse_MP4SLDescrTag(d, off, len1);
- break;
- }
- done:
- d->level--;
- avio_seek(&d->pb, off + len1, SEEK_SET);
- return 0;
- }
- static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
- Mp4Descr *descr, int *descr_count, int max_descr_count)
- {
- MP4DescrParseContext d;
- if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
- return -1;
- parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
- *descr_count = d.descr_count;
- return 0;
- }
- static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
- Mp4Descr *descr, int *descr_count, int max_descr_count)
- {
- MP4DescrParseContext d;
- if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
- return -1;
- parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
- *descr_count = d.descr_count;
- return 0;
- }
- static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
- {
- MpegTSContext *ts = filter->u.section_filter.opaque;
- SectionHeader h;
- const uint8_t *p, *p_end;
- AVIOContext pb;
- Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
- int mp4_descr_count = 0;
- int i, pid;
- AVFormatContext *s = ts->stream;
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(&h, &p, p_end) < 0)
- return;
- if (h.tid != M4OD_TID)
- return;
- mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
- for (pid = 0; pid < NB_PID_MAX; pid++) {
- if (!ts->pids[pid])
- continue;
- for (i = 0; i < mp4_descr_count; i++) {
- PESContext *pes;
- AVStream *st;
- if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
- continue;
- if (ts->pids[pid]->type != MPEGTS_PES) {
- av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
- continue;
- }
- pes = ts->pids[pid]->u.pes_filter.opaque;
- st = pes->st;
- if (!st) {
- continue;
- }
- pes->sl = mp4_descr[i].sl;
- ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
- mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
- ff_mp4_read_dec_config_descr(s, st, &pb);
- if (st->codec->codec_id == CODEC_ID_AAC &&
- st->codec->extradata_size > 0)
- st->need_parsing = 0;
- if (st->codec->codec_id == CODEC_ID_H264 &&
- st->codec->extradata_size > 0)
- st->need_parsing = 0;
- if (st->codec->codec_id <= CODEC_ID_NONE) {
- } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
- st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
- st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
- }
- }
- }
- for (i = 0; i < mp4_descr_count; i++)
- av_free(mp4_descr[i].dec_config_descr);
- }
- int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
- const uint8_t **pp, const uint8_t *desc_list_end,
- Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
- MpegTSContext *ts)
- {
- const uint8_t *desc_end;
- int desc_len, desc_tag, desc_es_id;
- char language[252];
- int i;
- desc_tag = get8(pp, desc_list_end);
- if (desc_tag < 0)
- return -1;
- desc_len = get8(pp, desc_list_end);
- if (desc_len < 0)
- return -1;
- desc_end = *pp + desc_len;
- if (desc_end > desc_list_end)
- return -1;
- av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
- if (st->codec->codec_id == CODEC_ID_NONE &&
- stream_type == STREAM_TYPE_PRIVATE_DATA)
- mpegts_find_stream_type(st, desc_tag, DESC_types);
- switch(desc_tag) {
- case 0x1E: /* SL descriptor */
- desc_es_id = get16(pp, desc_end);
- if (ts && ts->pids[pid])
- ts->pids[pid]->es_id = desc_es_id;
- for (i = 0; i < mp4_descr_count; i++)
- if (mp4_descr[i].dec_config_descr_len &&
- mp4_descr[i].es_id == desc_es_id) {
- AVIOContext pb;
- ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
- mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
- ff_mp4_read_dec_config_descr(fc, st, &pb);
- if (st->codec->codec_id == CODEC_ID_AAC &&
- st->codec->extradata_size > 0)
- st->need_parsing = 0;
- if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
- mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
- }
- break;
- case 0x1F: /* FMC descriptor */
- get16(pp, desc_end);
- if (mp4_descr_count > 0 && (st->codec->codec_id == CODEC_ID_AAC_LATM || st->request_probe>0) &&
- mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
- AVIOContext pb;
- ffio_init_context(&pb, mp4_descr->dec_config_descr,
- mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
- ff_mp4_read_dec_config_descr(fc, st, &pb);
- if (st->codec->codec_id == CODEC_ID_AAC &&
- st->codec->extradata_size > 0){
- st->request_probe= st->need_parsing = 0;
- st->codec->codec_type= AVMEDIA_TYPE_AUDIO;
- }
- }
- break;
- case 0x56: /* DVB teletext descriptor */
- language[0] = get8(pp, desc_end);
- language[1] = get8(pp, desc_end);
- language[2] = get8(pp, desc_end);
- language[3] = 0;
- av_dict_set(&st->metadata, "language", language, 0);
- break;
- case 0x59: /* subtitling descriptor */
- language[0] = get8(pp, desc_end);
- language[1] = get8(pp, desc_end);
- language[2] = get8(pp, desc_end);
- language[3] = 0;
- /* hearing impaired subtitles detection */
- switch(get8(pp, desc_end)) {
- case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
- case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
- case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
- case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
- case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
- case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
- st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
- break;
- }
- if (st->codec->extradata) {
- if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
- av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
- } else {
- st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
- if (st->codec->extradata) {
- st->codec->extradata_size = 4;
- memcpy(st->codec->extradata, *pp, 4);
- }
- }
- *pp += 4;
- av_dict_set(&st->metadata, "language", language, 0);
- break;
- case 0x0a: /* ISO 639 language descriptor */
- for (i = 0; i + 4 <= desc_len; i += 4) {
- language[i + 0] = get8(pp, desc_end);
- language[i + 1] = get8(pp, desc_end);
- language[i + 2] = get8(pp, desc_end);
- language[i + 3] = ',';
- switch (get8(pp, desc_end)) {
- case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
- case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
- case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
- }
- }
- if (i) {
- language[i - 1] = 0;
- av_dict_set(&st->metadata, "language", language, 0);
- }
- break;
- case 0x05: /* registration descriptor */
- st->codec->codec_tag = bytestream_get_le32(pp);
- av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
- if (st->codec->codec_id == CODEC_ID_NONE &&
- stream_type == STREAM_TYPE_PRIVATE_DATA)
- mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
- break;
- case 0x52: /* stream identifier descriptor */
- st->stream_identifier = 1 + get8(pp, desc_end);
- break;
- default:
- break;
- }
- *pp = desc_end;
- return 0;
- }
- static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
- {
- MpegTSContext *ts = filter->u.section_filter.opaque;
- SectionHeader h1, *h = &h1;
- PESContext *pes;
- AVStream *st;
- const uint8_t *p, *p_end, *desc_list_end;
- int program_info_length, pcr_pid, pid, stream_type;
- int desc_list_len;
- uint32_t prog_reg_desc = 0; /* registration descriptor */
- Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
- int mp4_descr_count = 0;
- int i;
- av_dlog(ts->stream, "PMT: len %i\n", section_len);
- hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(h, &p, p_end) < 0)
- return;
- av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
- h->id, h->sec_num, h->last_sec_num);
- if (h->tid != PMT_TID)
- return;
- clear_program(ts, h->id);
- pcr_pid = get16(&p, p_end) & 0x1fff;
- if (pcr_pid < 0)
- return;
- add_pid_to_pmt(ts, h->id, pcr_pid);
- set_pcr_pid(ts->stream, h->id, pcr_pid);
- av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
- program_info_length = get16(&p, p_end) & 0xfff;
- if (program_info_length < 0)
- return;
- while(program_info_length >= 2) {
- uint8_t tag, len;
- tag = get8(&p, p_end);
- len = get8(&p, p_end);
- av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
- if(len > program_info_length - 2)
- //something else is broken, exit the program_descriptors_loop
- break;
- program_info_length -= len + 2;
- if (tag == 0x1d) { // IOD descriptor
- get8(&p, p_end); // scope
- get8(&p, p_end); // label
- len -= 2;
- mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
- &mp4_descr_count, MAX_MP4_DESCR_COUNT);
- } else if (tag == 0x05 && len >= 4) { // registration descriptor
- prog_reg_desc = bytestream_get_le32(&p);
- len -= 4;
- }
- p += len;
- }
- p += program_info_length;
- if (p >= p_end)
- goto out;
- // stop parsing after pmt, we found header
- if (!ts->stream->nb_streams)
- ts->stop_parse = 2;
- for(;;) {
- st = 0;
- pes = NULL;
- stream_type = get8(&p, p_end);
- if (stream_type < 0)
- break;
- pid = get16(&p, p_end) & 0x1fff;
- if (pid < 0)
- break;
- /* now create stream */
- if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
- pes = ts->pids[pid]->u.pes_filter.opaque;
- if (!pes->st) {
- pes->st = avformat_new_stream(pes->stream, NULL);
- pes->st->id = pes->pid;
- }
- st = pes->st;
- } else if (stream_type != 0x13) {
- if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
- pes = add_pes_stream(ts, pid, pcr_pid);
- if (pes) {
- st = avformat_new_stream(pes->stream, NULL);
- st->id = pes->pid;
- }
- } else {
- int idx = ff_find_stream_index(ts->stream, pid);
- if (idx >= 0) {
- st = ts->stream->streams[idx];
- } else {
- st = avformat_new_stream(ts->stream, NULL);
- st->id = pid;
- st->codec->codec_type = AVMEDIA_TYPE_DATA;
- }
- }
- if (!st)
- goto out;
- if (pes && !pes->stream_type)
- mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
- add_pid_to_pmt(ts, h->id, pid);
- ff_program_add_stream_index(ts->stream, h->id, st->index);
- desc_list_len = get16(&p, p_end) & 0xfff;
- if (desc_list_len < 0)
- break;
- desc_list_end = p + desc_list_len;
- if (desc_list_end > p_end)
- break;
- for(;;) {
- if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
- mp4_descr, mp4_descr_count, pid, ts) < 0)
- break;
- if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
- ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
- pes->sub_st->codec->codec_tag = st->codec->codec_tag;
- }
- }
- p = desc_list_end;
- }
- out:
- for (i = 0; i < mp4_descr_count; i++)
- av_free(mp4_descr[i].dec_config_descr);
- }
- static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
- {
- MpegTSContext *ts = filter->u.section_filter.opaque;
- SectionHeader h1, *h = &h1;
- const uint8_t *p, *p_end;
- int sid, pmt_pid;
- AVProgram *program;
- av_dlog(ts->stream, "PAT:\n");
- hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(h, &p, p_end) < 0)
- return;
- if (h->tid != PAT_TID)
- return;
- ts->stream->ts_id = h->id;
- clear_programs(ts);
- for(;;) {
- sid = get16(&p, p_end);
- if (sid < 0)
- break;
- pmt_pid = get16(&p, p_end) & 0x1fff;
- if (pmt_pid < 0)
- break;
- av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
- if (sid == 0x0000) {
- /* NIT info */
- } else {
- MpegTSFilter *fil = ts->pids[pmt_pid];
- program = av_new_program(ts->stream, sid);
- program->program_num = sid;
- program->pmt_pid = pmt_pid;
- if (fil)
- if ( fil->type != MPEGTS_SECTION
- || fil->pid != pmt_pid
- || fil->u.section_filter.section_cb != pmt_cb)
- mpegts_close_filter(ts, ts->pids[pmt_pid]);
- if (!ts->pids[pmt_pid])
- mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
- add_pat_entry(ts, sid);
- add_pid_to_pmt(ts, sid, 0); //add pat pid to program
- add_pid_to_pmt(ts, sid, pmt_pid);
- }
- }
- }
- static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
- {
- MpegTSContext *ts = filter->u.section_filter.opaque;
- SectionHeader h1, *h = &h1;
- const uint8_t *p, *p_end, *desc_list_end, *desc_end;
- int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
- char *name, *provider_name;
- av_dlog(ts->stream, "SDT:\n");
- hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(h, &p, p_end) < 0)
- return;
- if (h->tid != SDT_TID)
- return;
- onid = get16(&p, p_end);
- if (onid < 0)
- return;
- val = get8(&p, p_end);
- if (val < 0)
- return;
- for(;;) {
- sid = get16(&p, p_end);
- if (sid < 0)
- break;
- val = get8(&p, p_end);
- if (val < 0)
- break;
- desc_list_len = get16(&p, p_end) & 0xfff;
- if (desc_list_len < 0)
- break;
- desc_list_end = p + desc_list_len;
- if (desc_list_end > p_end)
- break;
- for(;;) {
- desc_tag = get8(&p, desc_list_end);
- if (desc_tag < 0)
- break;
- desc_len = get8(&p, desc_list_end);
- desc_end = p + desc_len;
- if (desc_len < 0 || desc_end > desc_list_end)
- break;
- av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
- desc_tag, desc_len);
- switch(desc_tag) {
- case 0x48:
- service_type = get8(&p, p_end);
- if (service_type < 0)
- break;
- provider_name = getstr8(&p, p_end);
- if (!provider_name)
- break;
- name = getstr8(&p, p_end);
- if (name) {
- AVProgram *program = av_new_program(ts->stream, sid);
- if(program) {
- av_dict_set(&program->metadata, "service_name", name, 0);
- av_dict_set(&program->metadata, "service_provider", provider_name, 0);
- }
- }
- av_free(name);
- av_free(provider_name);
- break;
- default:
- break;
- }
- p = desc_end;
- }
- p = desc_list_end;
- }
- }
- /* handle one TS packet */
- static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
- {
- AVFormatContext *s = ts->stream;
- MpegTSFilter *tss;
- int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
- has_adaptation, has_payload;
- const uint8_t *p, *p_end;
- int64_t pos;
- pid = AV_RB16(packet + 1) & 0x1fff;
- if(pid && discard_pid(ts, pid))
- return 0;
- is_start = packet[1] & 0x40;
- tss = ts->pids[pid];
- if (ts->auto_guess && tss == NULL && is_start) {
- add_pes_stream(ts, pid, -1);
- tss = ts->pids[pid];
- }
- if (!tss)
- return 0;
- afc = (packet[3] >> 4) & 3;
- if (afc == 0) /* reserved value */
- return 0;
- has_adaptation = afc & 2;
- has_payload = afc & 1;
- is_discontinuity = has_adaptation
- && packet[4] != 0 /* with length > 0 */
- && (packet[5] & 0x80); /* and discontinuity indicated */
- /* continuity check (currently not used) */
- cc = (packet[3] & 0xf);
- expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
- cc_ok = pid == 0x1FFF // null packet PID
- || is_discontinuity
- || tss->last_cc < 0
- || expected_cc == cc;
- tss->last_cc = cc;
- if (!cc_ok) {
- av_log(ts->stream, AV_LOG_DEBUG,
- "Continuity check failed for pid %d expected %d got %d\n",
- pid, expected_cc, cc);
- if(tss->type == MPEGTS_PES) {
- PESContext *pc = tss->u.pes_filter.opaque;
- pc->flags |= AV_PKT_FLAG_CORRUPT;
- }
- }
- if (!has_payload)
- return 0;
- p = packet + 4;
- if (has_adaptation) {
- /* skip adaptation field */
- p += p[0] + 1;
- }
- /* if past the end of packet, ignore */
- p_end = packet + TS_PACKET_SIZE;
- if (p >= p_end)
- return 0;
- pos = avio_tell(ts->stream->pb);
- ts->pos47= pos % ts->raw_packet_size;
- if (tss->type == MPEGTS_SECTION) {
- if (is_start) {
- /* pointer field present */
- len = *p++;
- if (p + len > p_end)
- return 0;
- if (len && cc_ok) {
- /* write remaining section bytes */
- write_section_data(s, tss,
- p, len, 0);
- /* check whether filter has been closed */
- if (!ts->pids[pid])
- return 0;
- }
- p += len;
- if (p < p_end) {
- write_section_data(s, tss,
- p, p_end - p, 1);
- }
- } else {
- if (cc_ok) {
- write_section_data(s, tss,
- p, p_end - p, 0);
- }
- }
- } else {
- int ret;
- // Note: The position here points actually behind the current packet.
- if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
- pos - ts->raw_packet_size)) < 0)
- return ret;
- }
- return 0;
- }
- /* XXX: try to find a better synchro over several packets (use
- get_packet_size() ?) */
- static int mpegts_resync(AVFormatContext *s)
- {
- AVIOContext *pb = s->pb;
- int c, i;
- for(i = 0;i < MAX_RESYNC_SIZE; i++) {
- c = avio_r8(pb);
- if (url_feof(pb))
- return -1;
- if (c == 0x47) {
- avio_seek(pb, -1, SEEK_CUR);
- return 0;
- }
- }
- av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
- /* no sync found */
- return -1;
- }
- /* return -1 if error or EOF. Return 0 if OK. */
- static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
- {
- AVIOContext *pb = s->pb;
- int skip, len;
- for(;;) {
- len = avio_read(pb, buf, TS_PACKET_SIZE);
- if (len != TS_PACKET_SIZE)
- return len < 0 ? len : AVERROR_EOF;
- /* check packet sync byte */
- if (buf[0] != 0x47) {
- /* find a new packet start */
- avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
- if (mpegts_resync(s) < 0)
- return AVERROR(EAGAIN);
- else
- continue;
- } else {
- skip = raw_packet_size - TS_PACKET_SIZE;
- if (skip > 0)
- avio_skip(pb, skip);
- break;
- }
- }
- return 0;
- }
- static int handle_packets(MpegTSContext *ts, int nb_packets)
- {
- AVFormatContext *s = ts->stream;
- uint8_t packet[TS_PACKET_SIZE+FF_INPUT_BUFFER_PADDING_SIZE];
- int packet_num, ret = 0;
- if (avio_tell(s->pb) != ts->last_pos) {
- int i;
- av_dlog(ts->stream, "Skipping after seek\n");
- /* seek detected, flush pes buffer */
- for (i = 0; i < NB_PID_MAX; i++) {
- if (ts->pids[i]) {
- if (ts->pids[i]->type == MPEGTS_PES) {
- PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
- av_freep(&pes->buffer);
- pes->data_index = 0;
- pes->state = MPEGTS_SKIP; /* skip until pes header */
- }
- ts->pids[i]->last_cc = -1;
- }
- }
- }
- ts->stop_parse = 0;
- packet_num = 0;
- memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
- for(;;) {
- packet_num++;
- if (nb_packets != 0 && packet_num >= nb_packets ||
- ts->stop_parse > 1) {
- ret = AVERROR(EAGAIN);
- break;
- }
- if (ts->stop_parse > 0)
- break;
- ret = read_packet(s, packet, ts->raw_packet_size);
- if (ret != 0)
- break;
- ret = handle_packet(ts, packet);
- if (ret != 0)
- break;
- }
- ts->last_pos = avio_tell(s->pb);
- return ret;
- }
- static int mpegts_probe(AVProbeData *p)
- {
- #if 1
- const int size= p->buf_size;
- int score, fec_score, dvhs_score;
- int check_count= size / TS_FEC_PACKET_SIZE;
- #define CHECK_COUNT 10
- if (check_count < CHECK_COUNT)
- return -1;
- score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
- dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
- fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
- // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
- // we need a clear definition for the returned score otherwise things will become messy sooner or later
- if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
- else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
- else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
- else return -1;
- #else
- /* only use the extension for safer guess */
- if (av_match_ext(p->filename, "ts"))
- return AVPROBE_SCORE_MAX;
- else
- return 0;
- #endif
- }
- /* return the 90kHz PCR and the extension for the 27MHz PCR. return
- (-1) if not available */
- static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
- const uint8_t *packet)
- {
- int afc, len, flags;
- const uint8_t *p;
- unsigned int v;
- afc = (packet[3] >> 4) & 3;
- if (afc <= 1)
- return -1;
- p = packet + 4;
- len = p[0];
- p++;
- if (len == 0)
- return -1;
- flags = *p++;
- len--;
- if (!(flags & 0x10))
- return -1;
- if (len < 6)
- return -1;
- v = AV_RB32(p);
- *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
- *ppcr_low = ((p[4] & 1) << 8) | p[5];
- return 0;
- }
- static int mpegts_read_header(AVFormatContext *s,
- AVFormatParameters *ap)
- {
- MpegTSContext *ts = s->priv_data;
- AVIOContext *pb = s->pb;
- uint8_t buf[8*1024];
- int len;
- int64_t pos;
- /* read the first 8192 bytes to get packet size */
- pos = avio_tell(pb);
- len = avio_read(pb, buf, sizeof(buf));
- if (len != sizeof(buf))
- goto fail;
- ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
- if (ts->raw_packet_size <= 0) {
- av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
- ts->raw_packet_size = TS_PACKET_SIZE;
- }
- ts->stream = s;
- ts->auto_guess = 0;
- if (s->iformat == &ff_mpegts_demuxer) {
- /* normal demux */
- /* first do a scan to get all the services */
- /* NOTE: We attempt to seek on non-seekable files as well, as the
- * probe buffer usually is big enough. Only warn if the seek failed
- * on files where the seek should work. */
- if (avio_seek(pb, pos, SEEK_SET) < 0)
- av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
- mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
- mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
- handle_packets(ts, s->probesize / ts->raw_packet_size);
- /* if could not find service, enable auto_guess */
- ts->auto_guess = 1;
- av_dlog(ts->stream, "tuning done\n");
- s->ctx_flags |= AVFMTCTX_NOHEADER;
- } else {
- AVStream *st;
- int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
- int64_t pcrs[2], pcr_h;
- int packet_count[2];
- uint8_t packet[TS_PACKET_SIZE];
- /* only read packets */
- st = avformat_new_stream(s, NULL);
- if (!st)
- goto fail;
- avpriv_set_pts_info(st, 60, 1, 27000000);
- st->codec->codec_type = AVMEDIA_TYPE_DATA;
- st->codec->codec_id = CODEC_ID_MPEG2TS;
- /* we iterate until we find two PCRs to estimate the bitrate */
- pcr_pid = -1;
- nb_pcrs = 0;
- nb_packets = 0;
- for(;;) {
- ret = read_packet(s, packet, ts->raw_packet_size);
- if (ret < 0)
- return -1;
- pid = AV_RB16(packet + 1) & 0x1fff;
- if ((pcr_pid == -1 || pcr_pid == pid) &&
- parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
- pcr_pid = pid;
- packet_count[nb_pcrs] = nb_packets;
- pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
- nb_pcrs++;
- if (nb_pcrs >= 2)
- break;
- }
- nb_packets++;
- }
- /* NOTE1: the bitrate is computed without the FEC */
- /* NOTE2: it is only the bitrate of the start of the stream */
- ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
- ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
- s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
- st->codec->bit_rate = s->bit_rate;
- st->start_time = ts->cur_pcr;
- av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
- st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
- }
- avio_seek(pb, pos, SEEK_SET);
- return 0;
- fail:
- return -1;
- }
- #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
- static int mpegts_raw_read_packet(AVFormatContext *s,
- AVPacket *pkt)
- {
- MpegTSContext *ts = s->priv_data;
- int ret, i;
- int64_t pcr_h, next_pcr_h, pos;
- int pcr_l, next_pcr_l;
- uint8_t pcr_buf[12];
- if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
- return AVERROR(ENOMEM);
- pkt->pos= avio_tell(s->pb);
- ret = read_packet(s, pkt->data, ts->raw_packet_size);
- if (ret < 0) {
- av_free_packet(pkt);
- return ret;
- }
- if (ts->mpeg2ts_compute_pcr) {
- /* compute exact PCR for each packet */
- if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
- /* we read the next PCR (XXX: optimize it by using a bigger buffer */
- pos = avio_tell(s->pb);
- for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
- avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
- avio_read(s->pb, pcr_buf, 12);
- if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
- /* XXX: not precise enough */
- ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
- (i + 1);
- break;
- }
- }
- avio_seek(s->pb, pos, SEEK_SET);
- /* no next PCR found: we use previous increment */
- ts->cur_pcr = pcr_h * 300 + pcr_l;
- }
- pkt->pts = ts->cur_pcr;
- pkt->duration = ts->pcr_incr;
- ts->cur_pcr += ts->pcr_incr;
- }
- pkt->stream_index = 0;
- return 0;
- }
- static int mpegts_read_packet(AVFormatContext *s,
- AVPacket *pkt)
- {
- MpegTSContext *ts = s->priv_data;
- int ret, i;
- ts->pkt = pkt;
- ret = handle_packets(ts, 0);
- if (ret < 0) {
- /* flush pes data left */
- for (i = 0; i < NB_PID_MAX; i++) {
- if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
- PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
- if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
- new_pes_packet(pes, pkt);
- pes->state = MPEGTS_SKIP;
- ret = 0;
- break;
- }
- }
- }
- }
- return ret;
- }
- static int mpegts_read_close(AVFormatContext *s)
- {
- MpegTSContext *ts = s->priv_data;
- int i;
- clear_programs(ts);
- for(i=0;i<NB_PID_MAX;i++)
- if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
- return 0;
- }
- static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
- int64_t *ppos, int64_t pos_limit)
- {
- MpegTSContext *ts = s->priv_data;
- int64_t pos, timestamp;
- uint8_t buf[TS_PACKET_SIZE];
- int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
- pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
- while(pos < pos_limit) {
- if (avio_seek(s->pb, pos, SEEK_SET) < 0)
- return AV_NOPTS_VALUE;
- if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
- return AV_NOPTS_VALUE;
- if (buf[0] != 0x47) {
- if (mpegts_resync(s) < 0)
- return AV_NOPTS_VALUE;
- pos = avio_tell(s->pb);
- continue;
- }
- if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
- parse_pcr(×tamp, &pcr_l, buf) == 0) {
- *ppos = pos;
- return timestamp;
- }
- pos += ts->raw_packet_size;
- }
- return AV_NOPTS_VALUE;
- }
- static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
- int64_t *ppos, int64_t pos_limit)
- {
- MpegTSContext *ts = s->priv_data;
- int64_t pos;
- pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
- ff_read_frame_flush(s);
- if (avio_seek(s->pb, pos, SEEK_SET) < 0)
- return AV_NOPTS_VALUE;
- while(pos < pos_limit) {
- int ret;
- AVPacket pkt;
- av_init_packet(&pkt);
- ret= av_read_frame(s, &pkt);
- if(ret < 0)
- return AV_NOPTS_VALUE;
- av_free_packet(&pkt);
- if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){
- ff_reduce_index(s, pkt.stream_index);
- av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
- if(pkt.stream_index == stream_index){
- *ppos= pkt.pos;
- return pkt.dts;
- }
- }
- pos = pkt.pos;
- }
- return AV_NOPTS_VALUE;
- }
- #ifdef USE_SYNCPOINT_SEARCH
- static int read_seek2(AVFormatContext *s,
- int stream_index,
- int64_t min_ts,
- int64_t target_ts,
- int64_t max_ts,
- int flags)
- {
- int64_t pos;
- int64_t ts_ret, ts_adj;
- int stream_index_gen_search;
- AVStream *st;
- AVParserState *backup;
- backup = ff_store_parser_state(s);
- // detect direction of seeking for search purposes
- flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
- AVSEEK_FLAG_BACKWARD : 0;
- if (flags & AVSEEK_FLAG_BYTE) {
- // use position directly, we will search starting from it
- pos = target_ts;
- } else {
- // search for some position with good timestamp match
- if (stream_index < 0) {
- stream_index_gen_search = av_find_default_stream_index(s);
- if (stream_index_gen_search < 0) {
- ff_restore_parser_state(s, backup);
- return -1;
- }
- st = s->streams[stream_index_gen_search];
- // timestamp for default must be expressed in AV_TIME_BASE units
- ts_adj = av_rescale(target_ts,
- st->time_base.den,
- AV_TIME_BASE * (int64_t)st->time_base.num);
- } else {
- ts_adj = target_ts;
- stream_index_gen_search = stream_index;
- }
- pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
- 0, INT64_MAX, -1,
- AV_NOPTS_VALUE,
- AV_NOPTS_VALUE,
- flags, &ts_ret, mpegts_get_pcr);
- if (pos < 0) {
- ff_restore_parser_state(s, backup);
- return -1;
- }
- }
- // search for actual matching keyframe/starting position for all streams
- if (ff_gen_syncpoint_search(s, stream_index, pos,
- min_ts, target_ts, max_ts,
- flags) < 0) {
- ff_restore_parser_state(s, backup);
- return -1;
- }
- ff_free_parser_state(s, backup);
- return 0;
- }
- static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
- {
- int ret;
- if (flags & AVSEEK_FLAG_BACKWARD) {
- flags &= ~AVSEEK_FLAG_BACKWARD;
- ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
- if (ret < 0)
- // for compatibility reasons, seek to the best-fitting timestamp
- ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
- } else {
- ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
- if (ret < 0)
- // for compatibility reasons, seek to the best-fitting timestamp
- ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
- }
- return ret;
- }
- #endif
- /**************************************************************/
- /* parsing functions - called from other demuxers such as RTP */
- MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
- {
- MpegTSContext *ts;
- ts = av_mallocz(sizeof(MpegTSContext));
- if (!ts)
- return NULL;
- /* no stream case, currently used by RTP */
- ts->raw_packet_size = TS_PACKET_SIZE;
- ts->stream = s;
- ts->auto_guess = 1;
- mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
- mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
- return ts;
- }
- /* return the consumed length if a packet was output, or -1 if no
- packet is output */
- int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
- const uint8_t *buf, int len)
- {
- int len1;
- len1 = len;
- ts->pkt = pkt;
- for(;;) {
- ts->stop_parse = 0;
- if (len < TS_PACKET_SIZE)
- return -1;
- if (buf[0] != 0x47) {
- buf++;
- len--;
- } else {
- handle_packet(ts, buf);
- buf += TS_PACKET_SIZE;
- len -= TS_PACKET_SIZE;
- if (ts->stop_parse == 1)
- break;
- }
- }
- return len1 - len;
- }
- void ff_mpegts_parse_close(MpegTSContext *ts)
- {
- int i;
- for(i=0;i<NB_PID_MAX;i++)
- av_free(ts->pids[i]);
- av_free(ts);
- }
- AVInputFormat ff_mpegts_demuxer = {
- .name = "mpegts",
- .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
- .priv_data_size = sizeof(MpegTSContext),
- .read_probe = mpegts_probe,
- .read_header = mpegts_read_header,
- .read_packet = mpegts_read_packet,
- .read_close = mpegts_read_close,
- .read_timestamp = mpegts_get_dts,
- .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
- #ifdef USE_SYNCPOINT_SEARCH
- .read_seek2 = read_seek2,
- #endif
- };
- AVInputFormat ff_mpegtsraw_demuxer = {
- .name = "mpegtsraw",
- .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
- .priv_data_size = sizeof(MpegTSContext),
- .read_header = mpegts_read_header,
- .read_packet = mpegts_raw_read_packet,
- .read_close = mpegts_read_close,
- .read_timestamp = mpegts_get_dts,
- .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
- #ifdef USE_SYNCPOINT_SEARCH
- .read_seek2 = read_seek2,
- #endif
- .priv_class = &mpegtsraw_class,
- };
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