| /* |
| * 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_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, |
| }; |
