diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/mpegts.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/mpegts.c | 1513 |
1 files changed, 0 insertions, 1513 deletions
diff --git a/contrib/ffmpeg/libavformat/mpegts.c b/contrib/ffmpeg/libavformat/mpegts.c deleted file mode 100644 index ab046199a..000000000 --- a/contrib/ffmpeg/libavformat/mpegts.c +++ /dev/null @@ -1,1513 +0,0 @@ -/* - * 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 "avformat.h" -#include "crc.h" -#include "mpegts.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); -extern void av_set_program_name(AVProgram *program, char *provider_name, char *name); -extern void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx); - -enum MpegTSFilterType { - MPEGTS_PES, - MPEGTS_SECTION, -}; - -typedef struct MpegTSFilter MpegTSFilter; - -typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start); - -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; - int check_crc:1; - 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 -typedef struct { - unsigned int id; //program id/service id - unsigned int nb_pids; - unsigned int pids[MAX_PIDS_PER_PROGRAM]; -} Program_t; - -struct MpegTSContext { - /* user data */ - AVFormatContext *stream; - /** raw packet size, including FEC if present */ - int raw_packet_size; - /** 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; - Program_t *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; - 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) -{ - Program_t *p; - void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(Program_t)); - 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; - Program_t *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; - Program_t *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) - 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; i++){ - if(buf[i] == 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 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; - -#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; - 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_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) - 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) { - memcpy(st->language, language, 4); - } - - 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_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_set_program_name(program, provider_name, 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) -{ - 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; - } - 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->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; - /* 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; - int codec_type, codec_id; - - 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_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_MPEG1VIDEO; - } - 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; - - 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; - - 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 { - tss->u.pes_filter.pes_cb(tss, - p, p_end - p, is_start); - } -} - -/* 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; -#define CHECK_COUNT 10 - - if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT)) - return -1; - - score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL); - dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL); - fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, 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); - -// 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 90 kHz PCR and the extension for the 27 MHz 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[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; - 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->raw_packet_size) * ts->raw_packet_size; - 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", - "MPEG2 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, -}; - -AVInputFormat mpegtsraw_demuxer = { - "mpegtsraw", - "MPEG2 raw transport stream format", - sizeof(MpegTSContext), - mpegts_probe, - mpegts_read_header, - mpegts_raw_read_packet, - mpegts_read_close, - read_seek, - mpegts_get_pcr, - .flags = AVFMT_SHOW_IDS, -}; |