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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
- */
- #include "libavutil/crc.h"
- #include "libavutil/intreadwrite.h"
- #include "avformat.h"
- #include "mpegts.h"
- #include "internal.h"
- //#define DEBUG_SI
- //#define DEBUG_SEEK
- /* 1.0 second at 24Mbit/s */
- #define MAX_SCAN_PACKETS 32000
- /* maximum size in which we look for synchronisation if
- synchronisation is lost */
- #define MAX_RESYNC_SIZE 4096
- #define REGISTRATION_DESCRIPTOR 5
- typedef struct PESContext PESContext;
- static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
- static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
- enum MpegTSFilterType {
- MPEGTS_PES,
- MPEGTS_SECTION,
- };
- typedef struct MpegTSFilter MpegTSFilter;
- typedef void 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 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 {
- /* 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;
- /******************************************/
- /* 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];
- };
- /* TS stream handling */
- enum MpegTSState {
- MPEGTS_HEADER = 0,
- MPEGTS_PESHEADER_FILL,
- MPEGTS_PAYLOAD,
- MPEGTS_SKIP,
- };
- /* enough for PES header + length */
- #define PES_START_SIZE 9
- #define MAX_PES_HEADER_SIZE (9 + 255)
- 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;
- enum MpegTSState state;
- /* used to get the format */
- int data_index;
- int total_size;
- int pes_header_size;
- 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];
- };
- extern AVInputFormat 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;
- }
- /**
- * \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;
- }
- /**
- * Assembles PES packets out of TS packets, and then calls 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;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid);
- #endif
- 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->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->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) {
- /* referenced private data will be freed later in
- * av_close_input_stream */
- 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[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] & 0x30)){
- 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 preceeded 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;
- }
- 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, *desc_end;
- int program_info_length, pcr_pid, pid, stream_type;
- int desc_list_len, desc_len, desc_tag;
- int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
- char language[4] = {0}; /* initialize to kill warnings */
- int has_hdmv_descr = 0;
- int has_dirac_descr = 0;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "PMT: len %i\n", section_len);
- av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
- #endif
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(h, &p, p_end) < 0)
- return;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n",
- h->id, h->sec_num, h->last_sec_num);
- #endif
- 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);
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid);
- #endif
- 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);
- if(len > program_info_length - 2)
- //something else is broken, exit the program_descriptors_loop
- break;
- program_info_length -= len + 2;
- if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
- uint8_t bytes[4];
- bytes[0] = get8(&p, p_end);
- bytes[1] = get8(&p, p_end);
- bytes[2] = get8(&p, p_end);
- bytes[3] = get8(&p, p_end);
- len -= 4;
- if(bytes[0] == 'H' && bytes[1] == 'D' &&
- bytes[2] == 'M' && bytes[3] == 'V')
- has_hdmv_descr = 1;
- }
- p += len;
- }
- p += program_info_length;
- if (p >= p_end)
- return;
- for(;;) {
- language[0] = 0;
- st = 0;
- stream_type = get8(&p, p_end);
- if (stream_type < 0)
- break;
- pid = get16(&p, p_end) & 0x1fff;
- if (pid < 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;
- if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
- if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
- /*assume DVB AC-3 Audio*/
- stream_type = STREAM_TYPE_AUDIO_AC3;
- } else if(desc_tag == 0x7B) {
- /* DVB DTS audio */
- stream_type = STREAM_TYPE_AUDIO_DTS;
- }
- }
- desc_len = get8(&p, desc_list_end);
- desc_end = p + desc_len;
- if (desc_end > desc_list_end)
- break;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
- desc_tag, desc_len);
- #endif
- switch(desc_tag) {
- case DVB_SUBT_DESCID:
- if (stream_type == STREAM_TYPE_PRIVATE_DATA)
- stream_type = STREAM_TYPE_SUBTITLE_DVB;
- language[0] = get8(&p, desc_end);
- language[1] = get8(&p, desc_end);
- language[2] = get8(&p, desc_end);
- language[3] = 0;
- get8(&p, desc_end);
- comp_page = get16(&p, desc_end);
- anc_page = get16(&p, desc_end);
- break;
- case 0x0a: /* ISO 639 language descriptor */
- language[0] = get8(&p, desc_end);
- language[1] = get8(&p, desc_end);
- language[2] = get8(&p, desc_end);
- language[3] = 0;
- break;
- case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
- {
- uint8_t bytes[4];
- bytes[0] = get8(&p, desc_end);
- bytes[1] = get8(&p, desc_end);
- bytes[2] = get8(&p, desc_end);
- bytes[3] = get8(&p, desc_end);
- if(bytes[0] == 'd' && bytes[1] == 'r' &&
- bytes[2] == 'a' && bytes[3] == 'c')
- has_dirac_descr = 1;
- break;
- }
- default:
- break;
- }
- p = desc_end;
- }
- p = desc_list_end;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n",
- stream_type, pid);
- #endif
- /* now create ffmpeg stream */
- switch(stream_type) {
- case STREAM_TYPE_AUDIO_MPEG1:
- case STREAM_TYPE_AUDIO_MPEG2:
- case STREAM_TYPE_VIDEO_MPEG1:
- case STREAM_TYPE_VIDEO_MPEG2:
- case STREAM_TYPE_VIDEO_MPEG4:
- case STREAM_TYPE_VIDEO_H264:
- case STREAM_TYPE_VIDEO_VC1:
- case STREAM_TYPE_VIDEO_DIRAC:
- case STREAM_TYPE_AUDIO_AAC:
- case STREAM_TYPE_AUDIO_AC3:
- case STREAM_TYPE_AUDIO_DTS:
- case STREAM_TYPE_AUDIO_HDMV_DTS:
- case STREAM_TYPE_SUBTITLE_DVB:
- if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
- || (stream_type == STREAM_TYPE_VIDEO_DIRAC && !has_dirac_descr))
- break;
- if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
- pes= ts->pids[pid]->u.pes_filter.opaque;
- st= pes->st;
- }else{
- if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
- pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
- if (pes)
- st = new_pes_av_stream(pes, 0);
- }
- add_pid_to_pmt(ts, h->id, pid);
- if(st)
- av_program_add_stream_index(ts->stream, h->id, st->index);
- break;
- default:
- /* we ignore the other streams */
- break;
- }
- if (st) {
- if (language[0] != 0) {
- av_metadata_set(&st->metadata, "language", language);
- }
- if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
- st->codec->sub_id = (anc_page << 16) | comp_page;
- }
- }
- }
- /* all parameters are there */
- ts->stop_parse++;
- mpegts_close_filter(ts, filter);
- }
- 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;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "PAT:\n");
- av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
- #endif
- p_end = section + section_len - 4;
- p = section;
- if (parse_section_header(h, &p, p_end) < 0)
- return;
- if (h->tid != PAT_TID)
- return;
- 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;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
- #endif
- if (sid == 0x0000) {
- /* NIT info */
- } else {
- av_new_program(ts->stream, sid);
- ts->stop_parse--;
- 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);
- }
- }
- /* not found */
- ts->stop_parse++;
- mpegts_close_filter(ts, filter);
- }
- static void mpegts_set_service(MpegTSContext *ts)
- {
- mpegts_open_section_filter(ts, PAT_PID,
- pat_cb, ts, 1);
- }
- 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;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "SDT:\n");
- av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
- #endif
- 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;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n",
- desc_tag, desc_len);
- #endif
- 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_metadata_set(&program->metadata, "name", name);
- av_metadata_set(&program->metadata, "provider_name", provider_name);
- }
- }
- av_free(name);
- av_free(provider_name);
- break;
- default:
- break;
- }
- p = desc_end;
- }
- p = desc_list_end;
- }
- }
- /* scan services in a transport stream by looking at the SDT */
- static void mpegts_scan_sdt(MpegTSContext *ts)
- {
- mpegts_open_section_filter(ts, SDT_PID,
- sdt_cb, ts, 1);
- }
- static int64_t get_pts(const uint8_t *p)
- {
- int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
- pts |= (AV_RB16(p + 1) >> 1) << 15;
- pts |= AV_RB16(p + 3) >> 1;
- return pts;
- }
- /* return non zero if a packet could be constructed */
- static void 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;
- if (is_start) {
- 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 0
- av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
- #endif
- 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;
- if (!((code >= 0x1c0 && code <= 0x1df) ||
- (code >= 0x1e0 && code <= 0x1ef) ||
- (code == 0x1bd) || (code == 0x1fd)))
- goto skip;
- if (!pes->st) {
- /* allocate stream */
- new_pes_av_stream(pes, code);
- }
- pes->state = MPEGTS_PESHEADER_FILL;
- 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 += 6;
- pes->pes_header_size = pes->header[8] + 9;
- } else {
- /* otherwise, it should be a table */
- /* skip packet */
- skip:
- pes->state = MPEGTS_SKIP;
- continue;
- }
- }
- break;
- /**********************************************/
- /* PES packing parsing */
- case MPEGTS_PESHEADER_FILL:
- len = pes->pes_header_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->pes_header_size) {
- const uint8_t *r;
- unsigned int flags;
- 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 = get_pts(r);
- r += 5;
- } else if ((flags & 0xc0) == 0xc0) {
- pes->pts = get_pts(r);
- r += 5;
- pes->dts = get_pts(r);
- r += 5;
- }
- /* we got the full header. We parse it and get the payload */
- pes->state = MPEGTS_PAYLOAD;
- }
- break;
- case MPEGTS_PAYLOAD:
- if (pes->total_size) {
- len = pes->total_size - pes->data_index;
- if (len > buf_size)
- len = buf_size;
- } else {
- len = buf_size;
- }
- if (len > 0) {
- AVPacket *pkt = ts->pkt;
- if (pes->st && av_new_packet(pkt, len) == 0) {
- memcpy(pkt->data, p, len);
- 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;
- /* reset pts values */
- pes->pts = AV_NOPTS_VALUE;
- pes->dts = AV_NOPTS_VALUE;
- ts->stop_parse = 1;
- return;
- }
- }
- buf_size = 0;
- break;
- case MPEGTS_SKIP:
- buf_size = 0;
- break;
- }
- }
- }
- static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
- {
- AVStream *st;
- enum CodecID codec_id;
- enum CodecType codec_type;
- switch(pes->stream_type){
- case STREAM_TYPE_AUDIO_MPEG1:
- case STREAM_TYPE_AUDIO_MPEG2:
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MP3;
- break;
- case STREAM_TYPE_VIDEO_MPEG1:
- case STREAM_TYPE_VIDEO_MPEG2:
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_MPEG2VIDEO;
- break;
- case STREAM_TYPE_VIDEO_MPEG4:
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_MPEG4;
- break;
- case STREAM_TYPE_VIDEO_H264:
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_H264;
- break;
- case STREAM_TYPE_VIDEO_VC1:
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_VC1;
- break;
- case STREAM_TYPE_VIDEO_DIRAC:
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_DIRAC;
- break;
- case STREAM_TYPE_AUDIO_AAC:
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AAC;
- break;
- case STREAM_TYPE_AUDIO_AC3:
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- break;
- case STREAM_TYPE_AUDIO_DTS:
- case STREAM_TYPE_AUDIO_HDMV_DTS:
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_DTS;
- break;
- case STREAM_TYPE_SUBTITLE_DVB:
- codec_type = CODEC_TYPE_SUBTITLE;
- codec_id = CODEC_ID_DVB_SUBTITLE;
- break;
- default:
- if (code >= 0x1c0 && code <= 0x1df) {
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_MP2;
- } else if (code == 0x1bd) {
- codec_type = CODEC_TYPE_AUDIO;
- codec_id = CODEC_ID_AC3;
- } else {
- codec_type = CODEC_TYPE_VIDEO;
- codec_id = CODEC_ID_PROBE;
- }
- break;
- }
- st = av_new_stream(pes->stream, pes->pid);
- if (st) {
- av_set_pts_info(st, 33, 1, 90000);
- st->priv_data = pes;
- st->codec->codec_type = codec_type;
- st->codec->codec_id = codec_id;
- st->need_parsing = AVSTREAM_PARSE_FULL;
- pes->st = st;
- }
- return st;
- }
- static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
- {
- 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->stream_type = stream_type;
- tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
- if (!tss) {
- av_free(pes);
- return 0;
- }
- return pes;
- }
- /* handle one TS packet */
- static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
- {
- AVFormatContext *s = ts->stream;
- MpegTSFilter *tss;
- int len, pid, cc, cc_ok, afc, is_start;
- const uint8_t *p, *p_end;
- int64_t pos;
- pid = AV_RB16(packet + 1) & 0x1fff;
- if(pid && discard_pid(ts, pid))
- return;
- is_start = packet[1] & 0x40;
- tss = ts->pids[pid];
- if (ts->auto_guess && tss == NULL && is_start) {
- add_pes_stream(ts, pid, -1, 0);
- tss = ts->pids[pid];
- }
- if (!tss)
- return;
- /* continuity check (currently not used) */
- cc = (packet[3] & 0xf);
- cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
- tss->last_cc = cc;
- /* skip adaptation field */
- afc = (packet[3] >> 4) & 3;
- p = packet + 4;
- if (afc == 0) /* reserved value */
- return;
- if (afc == 2) /* adaptation field only */
- return;
- if (afc == 3) {
- /* skip adapation field */
- p += p[0] + 1;
- }
- /* if past the end of packet, ignore */
- p_end = packet + TS_PACKET_SIZE;
- if (p >= p_end)
- return;
- pos = url_ftell(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;
- 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;
- }
- 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 {
- // Note: The position here points actually behind the current packet.
- tss->u.pes_filter.pes_cb(tss,
- p, p_end - p, is_start, pos - ts->raw_packet_size);
- }
- }
- /* XXX: try to find a better synchro over several packets (use
- get_packet_size() ?) */
- static int mpegts_resync(ByteIOContext *pb)
- {
- int c, i;
- for(i = 0;i < MAX_RESYNC_SIZE; i++) {
- c = url_fgetc(pb);
- if (c < 0)
- return -1;
- if (c == 0x47) {
- url_fseek(pb, -1, SEEK_CUR);
- return 0;
- }
- }
- /* no sync found */
- return -1;
- }
- /* return -1 if error or EOF. Return 0 if OK. */
- static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
- {
- int skip, len;
- for(;;) {
- len = get_buffer(pb, buf, TS_PACKET_SIZE);
- if (len != TS_PACKET_SIZE)
- return AVERROR(EIO);
- /* check paquet sync byte */
- if (buf[0] != 0x47) {
- /* find a new packet start */
- url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
- if (mpegts_resync(pb) < 0)
- return AVERROR_INVALIDDATA;
- else
- continue;
- } else {
- skip = raw_packet_size - TS_PACKET_SIZE;
- if (skip > 0)
- url_fskip(pb, skip);
- break;
- }
- }
- return 0;
- }
- static int handle_packets(MpegTSContext *ts, int nb_packets)
- {
- AVFormatContext *s = ts->stream;
- ByteIOContext *pb = s->pb;
- uint8_t packet[TS_PACKET_SIZE];
- int packet_num, ret;
- ts->stop_parse = 0;
- packet_num = 0;
- for(;;) {
- if (ts->stop_parse>0)
- break;
- packet_num++;
- if (nb_packets != 0 && packet_num >= nb_packets)
- break;
- ret = read_packet(pb, packet, ts->raw_packet_size);
- if (ret != 0)
- return ret;
- handle_packet(ts, packet);
- }
- return 0;
- }
- 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 (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;
- ByteIOContext *pb = s->pb;
- uint8_t buf[5*1024];
- int len;
- int64_t pos;
- if (ap) {
- ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
- if(ap->mpeg2ts_raw){
- av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
- return -1;
- }
- }
- /* read the first 1024 bytes to get packet size */
- pos = url_ftell(pb);
- len = get_buffer(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)
- goto fail;
- ts->stream = s;
- ts->auto_guess = 0;
- if (s->iformat == &mpegts_demuxer) {
- /* normal demux */
- /* first do a scaning to get all the services */
- url_fseek(pb, pos, SEEK_SET);
- mpegts_scan_sdt(ts);
- mpegts_set_service(ts);
- handle_packets(ts, s->probesize);
- /* if could not find service, enable auto_guess */
- ts->auto_guess = 1;
- #ifdef DEBUG_SI
- av_log(ts->stream, AV_LOG_DEBUG, "tuning done\n");
- #endif
- 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 = av_new_stream(s, 0);
- if (!st)
- goto fail;
- av_set_pts_info(st, 60, 1, 27000000);
- st->codec->codec_type = CODEC_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->pb, 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;
- #if 0
- av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
- st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
- #endif
- }
- url_fseek(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= url_ftell(s->pb);
- ret = read_packet(s->pb, 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 = url_ftell(s->pb);
- for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
- url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
- get_buffer(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;
- }
- }
- url_fseek(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;
- ts->pkt = pkt;
- return handle_packets(ts, 0);
- }
- 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;
- const int find_next= 1;
- pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
- if (find_next) {
- for(;;) {
- url_fseek(s->pb, pos, SEEK_SET);
- if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
- return AV_NOPTS_VALUE;
- if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
- parse_pcr(×tamp, &pcr_l, buf) == 0) {
- break;
- }
- pos += ts->raw_packet_size;
- }
- } else {
- for(;;) {
- pos -= ts->raw_packet_size;
- if (pos < 0)
- return AV_NOPTS_VALUE;
- url_fseek(s->pb, pos, SEEK_SET);
- if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
- return AV_NOPTS_VALUE;
- if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
- parse_pcr(×tamp, &pcr_l, buf) == 0) {
- break;
- }
- }
- }
- *ppos = pos;
- return timestamp;
- }
- static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
- MpegTSContext *ts = s->priv_data;
- uint8_t buf[TS_PACKET_SIZE];
- int64_t pos;
- if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
- return -1;
- pos= url_ftell(s->pb);
- for(;;) {
- url_fseek(s->pb, pos, SEEK_SET);
- if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
- return -1;
- // pid = AV_RB16(buf + 1) & 0x1fff;
- if(buf[1] & 0x40) break;
- pos += ts->raw_packet_size;
- }
- url_fseek(s->pb, pos, SEEK_SET);
- return 0;
- }
- /**************************************************************/
- /* parsing functions - called from other demuxers such as RTP */
- MpegTSContext *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;
- return ts;
- }
- /* return the consumed length if a packet was output, or -1 if no
- packet is output */
- int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
- const uint8_t *buf, int len)
- {
- int len1;
- len1 = len;
- ts->pkt = pkt;
- ts->stop_parse = 0;
- for(;;) {
- if (ts->stop_parse>0)
- break;
- 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;
- }
- }
- return len1 - len;
- }
- void mpegts_parse_close(MpegTSContext *ts)
- {
- int i;
- for(i=0;i<NB_PID_MAX;i++)
- av_free(ts->pids[i]);
- av_free(ts);
- }
- AVInputFormat mpegts_demuxer = {
- "mpegts",
- NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
- sizeof(MpegTSContext),
- mpegts_probe,
- mpegts_read_header,
- mpegts_read_packet,
- mpegts_read_close,
- read_seek,
- mpegts_get_pcr,
- .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
- };
- AVInputFormat mpegtsraw_demuxer = {
- "mpegtsraw",
- NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
- sizeof(MpegTSContext),
- NULL,
- mpegts_read_header,
- mpegts_raw_read_packet,
- mpegts_read_close,
- read_seek,
- mpegts_get_pcr,
- .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
- };
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