| /* |
| * MPEG2 transport stream (aka DVB) demuxer |
| * Copyright (c) 2002-2003 Fabrice Bellard |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| //#define USE_SYNCPOINT_SEARCH |
| |
| #include "libavutil/crc.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/log.h" |
| #include "libavutil/dict.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/opt.h" |
| #include "libavcodec/bytestream.h" |
| #include "avformat.h" |
| #include "mpegts.h" |
| #include "internal.h" |
| #include "avio_internal.h" |
| #include "seek.h" |
| #include "mpeg.h" |
| #include "isom.h" |
| |
| /* maximum size in which we look for synchronisation if |
| synchronisation is lost */ |
| #define MAX_RESYNC_SIZE 65536 |
| |
| #define MAX_PES_PAYLOAD 200*1024 |
| |
| enum MpegTSFilterType { |
| MPEGTS_PES, |
| MPEGTS_SECTION, |
| }; |
| |
| typedef struct MpegTSFilter MpegTSFilter; |
| |
| typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos); |
| |
| typedef struct MpegTSPESFilter { |
| PESCallback *pes_cb; |
| void *opaque; |
| } MpegTSPESFilter; |
| |
| typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len); |
| |
| typedef void SetServiceCallback(void *opaque, int ret); |
| |
| typedef struct MpegTSSectionFilter { |
| int section_index; |
| int section_h_size; |
| uint8_t *section_buf; |
| unsigned int check_crc:1; |
| unsigned int end_of_section_reached:1; |
| SectionCallback *section_cb; |
| void *opaque; |
| } MpegTSSectionFilter; |
| |
| struct MpegTSFilter { |
| int pid; |
| int last_cc; /* last cc code (-1 if first packet) */ |
| enum MpegTSFilterType type; |
| union { |
| MpegTSPESFilter pes_filter; |
| MpegTSSectionFilter section_filter; |
| } u; |
| }; |
| |
| #define MAX_PIDS_PER_PROGRAM 64 |
| struct Program { |
| unsigned int id; //program id/service id |
| unsigned int nb_pids; |
| unsigned int pids[MAX_PIDS_PER_PROGRAM]; |
| }; |
| |
| struct MpegTSContext { |
| const AVClass *class; |
| /* user data */ |
| AVFormatContext *stream; |
| /** raw packet size, including FEC if present */ |
| int raw_packet_size; |
| |
| int pos47; |
| |
| /** if true, all pids are analyzed to find streams */ |
| int auto_guess; |
| |
| /** compute exact PCR for each transport stream packet */ |
| int mpeg2ts_compute_pcr; |
| |
| int64_t cur_pcr; /**< used to estimate the exact PCR */ |
| int pcr_incr; /**< used to estimate the exact PCR */ |
| |
| /* data needed to handle file based ts */ |
| /** stop parsing loop */ |
| int stop_parse; |
| /** packet containing Audio/Video data */ |
| AVPacket *pkt; |
| /** to detect seek */ |
| int64_t last_pos; |
| |
| /******************************************/ |
| /* private mpegts data */ |
| /* scan context */ |
| /** structure to keep track of Program->pids mapping */ |
| unsigned int nb_prg; |
| struct Program *prg; |
| |
| |
| /** filters for various streams specified by PMT + for the PAT and PMT */ |
| MpegTSFilter *pids[NB_PID_MAX]; |
| }; |
| |
| static const AVOption options[] = { |
| {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), FF_OPT_TYPE_INT, |
| {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM }, |
| { NULL }, |
| }; |
| |
| static const AVClass mpegtsraw_class = { |
| .class_name = "mpegtsraw demuxer", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| /* TS stream handling */ |
| |
| enum MpegTSState { |
| MPEGTS_HEADER = 0, |
| MPEGTS_PESHEADER, |
| MPEGTS_PESHEADER_FILL, |
| MPEGTS_PAYLOAD, |
| MPEGTS_SKIP, |
| }; |
| |
| /* enough for PES header + length */ |
| #define PES_START_SIZE 6 |
| #define PES_HEADER_SIZE 9 |
| #define MAX_PES_HEADER_SIZE (9 + 255) |
| |
| typedef struct PESContext { |
| int pid; |
| int pcr_pid; /**< if -1 then all packets containing PCR are considered */ |
| int stream_type; |
| MpegTSContext *ts; |
| AVFormatContext *stream; |
| AVStream *st; |
| AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */ |
| enum MpegTSState state; |
| /* used to get the format */ |
| int data_index; |
| int flags; /**< copied to the AVPacket flags */ |
| int total_size; |
| int pes_header_size; |
| int extended_stream_id; |
| int64_t pts, dts; |
| int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */ |
| uint8_t header[MAX_PES_HEADER_SIZE]; |
| uint8_t *buffer; |
| } PESContext; |
| |
| extern AVInputFormat ff_mpegts_demuxer; |
| |
| static void clear_program(MpegTSContext *ts, unsigned int programid) |
| { |
| int i; |
| |
| for(i=0; i<ts->nb_prg; i++) |
| if(ts->prg[i].id == programid) |
| ts->prg[i].nb_pids = 0; |
| } |
| |
| static void clear_programs(MpegTSContext *ts) |
| { |
| av_freep(&ts->prg); |
| ts->nb_prg=0; |
| } |
| |
| static void add_pat_entry(MpegTSContext *ts, unsigned int programid) |
| { |
| struct Program *p; |
| void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program)); |
| if(!tmp) |
| return; |
| ts->prg = tmp; |
| p = &ts->prg[ts->nb_prg]; |
| p->id = programid; |
| p->nb_pids = 0; |
| ts->nb_prg++; |
| } |
| |
| static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid) |
| { |
| int i; |
| struct Program *p = NULL; |
| for(i=0; i<ts->nb_prg; i++) { |
| if(ts->prg[i].id == programid) { |
| p = &ts->prg[i]; |
| break; |
| } |
| } |
| if(!p) |
| return; |
| |
| if(p->nb_pids >= MAX_PIDS_PER_PROGRAM) |
| return; |
| p->pids[p->nb_pids++] = pid; |
| } |
| |
| static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid) |
| { |
| int i; |
| for(i=0; i<s->nb_programs; i++) { |
| if(s->programs[i]->id == programid) { |
| s->programs[i]->pcr_pid = pid; |
| break; |
| } |
| } |
| } |
| |
| /** |
| * @brief discard_pid() decides if the pid is to be discarded according |
| * to caller's programs selection |
| * @param ts : - TS context |
| * @param pid : - pid |
| * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL |
| * 0 otherwise |
| */ |
| static int discard_pid(MpegTSContext *ts, unsigned int pid) |
| { |
| int i, j, k; |
| int used = 0, discarded = 0; |
| struct Program *p; |
| for(i=0; i<ts->nb_prg; i++) { |
| p = &ts->prg[i]; |
| for(j=0; j<p->nb_pids; j++) { |
| if(p->pids[j] != pid) |
| continue; |
| //is program with id p->id set to be discarded? |
| for(k=0; k<ts->stream->nb_programs; k++) { |
| if(ts->stream->programs[k]->id == p->id) { |
| if(ts->stream->programs[k]->discard == AVDISCARD_ALL) |
| discarded++; |
| else |
| used++; |
| } |
| } |
| } |
| } |
| |
| return !used && discarded; |
| } |
| |
| /** |
| * Assemble PES packets out of TS packets, and then call the "section_cb" |
| * function when they are complete. |
| */ |
| static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1, |
| const uint8_t *buf, int buf_size, int is_start) |
| { |
| MpegTSSectionFilter *tss = &tss1->u.section_filter; |
| int len; |
| |
| if (is_start) { |
| memcpy(tss->section_buf, buf, buf_size); |
| tss->section_index = buf_size; |
| tss->section_h_size = -1; |
| tss->end_of_section_reached = 0; |
| } else { |
| if (tss->end_of_section_reached) |
| return; |
| len = 4096 - tss->section_index; |
| if (buf_size < len) |
| len = buf_size; |
| memcpy(tss->section_buf + tss->section_index, buf, len); |
| tss->section_index += len; |
| } |
| |
| /* compute section length if possible */ |
| if (tss->section_h_size == -1 && tss->section_index >= 3) { |
| len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3; |
| if (len > 4096) |
| return; |
| tss->section_h_size = len; |
| } |
| |
| if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) { |
| tss->end_of_section_reached = 1; |
| if (!tss->check_crc || |
| av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, |
| tss->section_buf, tss->section_h_size) == 0) |
| tss->section_cb(tss1, tss->section_buf, tss->section_h_size); |
| } |
| } |
| |
| static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, |
| SectionCallback *section_cb, void *opaque, |
| int check_crc) |
| |
| { |
| MpegTSFilter *filter; |
| MpegTSSectionFilter *sec; |
| |
| av_dlog(ts->stream, "Filter: pid=0x%x\n", pid); |
| |
| if (pid >= NB_PID_MAX || ts->pids[pid]) |
| return NULL; |
| filter = av_mallocz(sizeof(MpegTSFilter)); |
| if (!filter) |
| return NULL; |
| ts->pids[pid] = filter; |
| filter->type = MPEGTS_SECTION; |
| filter->pid = pid; |
| filter->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) { |
| PESContext *pes = filter->u.pes_filter.opaque; |
| av_freep(&pes->buffer); |
| /* 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[TS_MAX_PACKET_SIZE]; |
| int i; |
| int x=0; |
| int best_score=0; |
| |
| memset(stat, 0, packet_size*sizeof(int)); |
| |
| for(x=i=0; i<size-3; i++){ |
| if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 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; |
| } |
| |
| typedef struct { |
| uint32_t stream_type; |
| enum AVMediaType codec_type; |
| enum CodecID codec_id; |
| } StreamType; |
| |
| static const StreamType ISO_types[] = { |
| { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO }, |
| { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO }, |
| { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 }, |
| { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 }, |
| { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC }, |
| { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 }, |
| { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */ |
| { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 }, |
| { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC }, |
| { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 }, |
| { 0 }, |
| }; |
| |
| static const StreamType HDMV_types[] = { |
| { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY }, |
| { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, |
| { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, |
| { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD }, |
| { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, |
| { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE }, |
| { 0 }, |
| }; |
| |
| /* ATSC ? */ |
| static const StreamType MISC_types[] = { |
| { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, |
| { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, |
| { 0 }, |
| }; |
| |
| static const StreamType REGD_types[] = { |
| { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC }, |
| { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, |
| { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M }, |
| { 0 }, |
| }; |
| |
| /* descriptor present */ |
| static const StreamType DESC_types[] = { |
| { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */ |
| { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */ |
| { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS }, |
| { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT }, |
| { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */ |
| { 0 }, |
| }; |
| |
| static void mpegts_find_stream_type(AVStream *st, |
| uint32_t stream_type, const StreamType *types) |
| { |
| for (; types->stream_type; types++) { |
| if (stream_type == types->stream_type) { |
| st->codec->codec_type = types->codec_type; |
| st->codec->codec_id = types->codec_id; |
| st->request_probe = 0; |
| return; |
| } |
| } |
| } |
| |
| static int mpegts_set_stream_info(AVStream *st, PESContext *pes, |
| uint32_t stream_type, uint32_t prog_reg_desc) |
| { |
| av_set_pts_info(st, 33, 1, 90000); |
| st->priv_data = pes; |
| st->codec->codec_type = AVMEDIA_TYPE_DATA; |
| st->codec->codec_id = CODEC_ID_NONE; |
| st->need_parsing = AVSTREAM_PARSE_FULL; |
| pes->st = st; |
| pes->stream_type = stream_type; |
| |
| av_log(pes->stream, AV_LOG_DEBUG, |
| "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n", |
| st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc); |
| |
| st->codec->codec_tag = pes->stream_type; |
| |
| mpegts_find_stream_type(st, pes->stream_type, ISO_types); |
| if (prog_reg_desc == AV_RL32("HDMV") && |
| st->codec->codec_id == CODEC_ID_NONE) { |
| mpegts_find_stream_type(st, pes->stream_type, HDMV_types); |
| if (pes->stream_type == 0x83) { |
| // HDMV TrueHD streams also contain an AC3 coded version of the |
| // audio track - add a second stream for this |
| AVStream *sub_st; |
| // priv_data cannot be shared between streams |
| PESContext *sub_pes = av_malloc(sizeof(*sub_pes)); |
| if (!sub_pes) |
| return AVERROR(ENOMEM); |
| memcpy(sub_pes, pes, sizeof(*sub_pes)); |
| |
| sub_st = av_new_stream(pes->stream, pes->pid); |
| if (!sub_st) { |
| av_free(sub_pes); |
| return AVERROR(ENOMEM); |
| } |
| |
| av_set_pts_info(sub_st, 33, 1, 90000); |
| sub_st->priv_data = sub_pes; |
| sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| sub_st->codec->codec_id = CODEC_ID_AC3; |
| sub_st->need_parsing = AVSTREAM_PARSE_FULL; |
| sub_pes->sub_st = pes->sub_st = sub_st; |
| } |
| } |
| if (st->codec->codec_id == CODEC_ID_NONE) |
| mpegts_find_stream_type(st, pes->stream_type, MISC_types); |
| |
| return 0; |
| } |
| |
| static void new_pes_packet(PESContext *pes, AVPacket *pkt) |
| { |
| av_init_packet(pkt); |
| |
| pkt->destruct = av_destruct_packet; |
| pkt->data = pes->buffer; |
| pkt->size = pes->data_index; |
| |
| if(pes->total_size != MAX_PES_PAYLOAD && |
| pes->pes_header_size + pes->data_index != pes->total_size + 6) { |
| av_log(pes->ts, AV_LOG_WARNING, "PES packet size mismatch\n"); |
| pes->flags |= AV_PKT_FLAG_CORRUPT; |
| } |
| memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
| |
| // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID |
| if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76) |
| pkt->stream_index = pes->sub_st->index; |
| else |
| pkt->stream_index = pes->st->index; |
| pkt->pts = pes->pts; |
| pkt->dts = pes->dts; |
| /* store position of first TS packet of this PES packet */ |
| pkt->pos = pes->ts_packet_pos; |
| pkt->flags = pes->flags; |
| |
| /* reset pts values */ |
| pes->pts = AV_NOPTS_VALUE; |
| pes->dts = AV_NOPTS_VALUE; |
| pes->buffer = NULL; |
| pes->data_index = 0; |
| pes->flags = 0; |
| } |
| |
| /* return non zero if a packet could be constructed */ |
| static int mpegts_push_data(MpegTSFilter *filter, |
| const uint8_t *buf, int buf_size, int is_start, |
| int64_t pos) |
| { |
| PESContext *pes = filter->u.pes_filter.opaque; |
| MpegTSContext *ts = pes->ts; |
| const uint8_t *p; |
| int len, code; |
| |
| if(!ts->pkt) |
| return 0; |
| |
| if (is_start) { |
| if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) { |
| new_pes_packet(pes, ts->pkt); |
| ts->stop_parse = 1; |
| } |
| pes->state = MPEGTS_HEADER; |
| pes->data_index = 0; |
| pes->ts_packet_pos = pos; |
| } |
| p = buf; |
| while (buf_size > 0) { |
| switch(pes->state) { |
| case MPEGTS_HEADER: |
| len = PES_START_SIZE - pes->data_index; |
| if (len > buf_size) |
| len = buf_size; |
| memcpy(pes->header + pes->data_index, p, len); |
| pes->data_index += len; |
| p += len; |
| buf_size -= len; |
| if (pes->data_index == PES_START_SIZE) { |
| /* we got all the PES or section header. We can now |
| decide */ |
| if (pes->header[0] == 0x00 && pes->header[1] == 0x00 && |
| pes->header[2] == 0x01) { |
| /* it must be an mpeg2 PES stream */ |
| code = pes->header[3] | 0x100; |
| av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code); |
| |
| if ((pes->st && pes->st->discard == AVDISCARD_ALL) || |
| code == 0x1be) /* padding_stream */ |
| goto skip; |
| |
| #if FF_API_MAX_STREAMS |
| if (!pes->st && pes->stream->nb_streams == MAX_STREAMS) |
| goto skip; |
| #endif |
| |
| /* stream not present in PMT */ |
| if (!pes->st) { |
| pes->st = av_new_stream(ts->stream, pes->pid); |
| if (!pes->st) |
| return AVERROR(ENOMEM); |
| mpegts_set_stream_info(pes->st, pes, 0, 0); |
| } |
| |
| pes->total_size = AV_RB16(pes->header + 4); |
| /* NOTE: a zero total size means the PES size is |
| unbounded */ |
| if (!pes->total_size) |
| pes->total_size = MAX_PES_PAYLOAD; |
| |
| /* allocate pes buffer */ |
| pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!pes->buffer) |
| return AVERROR(ENOMEM); |
| |
| if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */ |
| code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */ |
| code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */ |
| code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */ |
| pes->state = MPEGTS_PESHEADER; |
| if (pes->st->codec->codec_id == CODEC_ID_NONE && !pes->st->request_probe) { |
| av_dlog(pes->stream, "pid=%x stream_type=%x probing\n", |
| pes->pid, pes->stream_type); |
| pes->st->request_probe= 1; |
| } |
| } else { |
| pes->state = MPEGTS_PAYLOAD; |
| pes->data_index = 0; |
| } |
| } else { |
| /* otherwise, it should be a table */ |
| /* skip packet */ |
| skip: |
| pes->state = MPEGTS_SKIP; |
| continue; |
| } |
| } |
| break; |
| /**********************************************/ |
| /* PES packing parsing */ |
| case MPEGTS_PESHEADER: |
| len = PES_HEADER_SIZE - pes->data_index; |
| if (len < 0) |
| return -1; |
| if (len > buf_size) |
| len = buf_size; |
| memcpy(pes->header + pes->data_index, p, len); |
| pes->data_index += len; |
| p += len; |
| buf_size -= len; |
| if (pes->data_index == PES_HEADER_SIZE) { |
| pes->pes_header_size = pes->header[8] + 9; |
| pes->state = MPEGTS_PESHEADER_FILL; |
| } |
| break; |
| case MPEGTS_PESHEADER_FILL: |
| len = pes->pes_header_size - pes->data_index; |
| if (len < 0) |
| return -1; |
| if (len > buf_size) |
| len = buf_size; |
| memcpy(pes->header + pes->data_index, p, len); |
| pes->data_index += len; |
| p += len; |
| buf_size -= len; |
| if (pes->data_index == pes->pes_header_size) { |
| const uint8_t *r; |
| unsigned int flags, pes_ext, skip; |
| |
| flags = pes->header[7]; |
| r = pes->header + 9; |
| pes->pts = AV_NOPTS_VALUE; |
| pes->dts = AV_NOPTS_VALUE; |
| if ((flags & 0xc0) == 0x80) { |
| pes->dts = pes->pts = ff_parse_pes_pts(r); |
| r += 5; |
| } else if ((flags & 0xc0) == 0xc0) { |
| pes->pts = ff_parse_pes_pts(r); |
| r += 5; |
| pes->dts = ff_parse_pes_pts(r); |
| r += 5; |
| } |
| pes->extended_stream_id = -1; |
| if (flags & 0x01) { /* PES extension */ |
| pes_ext = *r++; |
| /* Skip PES private data, program packet sequence counter and P-STD buffer */ |
| skip = (pes_ext >> 4) & 0xb; |
| skip += skip & 0x9; |
| r += skip; |
| if ((pes_ext & 0x41) == 0x01 && |
| (r + 2) <= (pes->header + pes->pes_header_size)) { |
| /* PES extension 2 */ |
| if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0) |
| pes->extended_stream_id = r[1]; |
| } |
| } |
| |
| /* we got the full header. We parse it and get the payload */ |
| pes->state = MPEGTS_PAYLOAD; |
| pes->data_index = 0; |
| } |
| break; |
| case MPEGTS_PAYLOAD: |
| if (buf_size > 0 && pes->buffer) { |
| if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) { |
| new_pes_packet(pes, ts->pkt); |
| pes->total_size = MAX_PES_PAYLOAD; |
| pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!pes->buffer) |
| return AVERROR(ENOMEM); |
| ts->stop_parse = 1; |
| } else if (pes->data_index == 0 && buf_size > pes->total_size) { |
| // pes packet size is < ts size packet and pes data is padded with 0xff |
| // not sure if this is legal in ts but see issue #2392 |
| buf_size = pes->total_size; |
| } |
| memcpy(pes->buffer+pes->data_index, p, buf_size); |
| pes->data_index += buf_size; |
| } |
| buf_size = 0; |
| /* emit complete packets with known packet size |
| * decreases demuxer delay for infrequent packets like subtitles from |
| * a couple of seconds to milliseconds for properly muxed files. |
| * total_size is the number of bytes following pes_packet_length |
| * in the pes header, i.e. not counting the first 6 bytes */ |
| if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD && |
| pes->pes_header_size + pes->data_index == pes->total_size + 6) { |
| ts->stop_parse = 1; |
| new_pes_packet(pes, ts->pkt); |
| } |
| break; |
| case MPEGTS_SKIP: |
| buf_size = 0; |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid) |
| { |
| MpegTSFilter *tss; |
| PESContext *pes; |
| |
| /* if no pid found, then add a pid context */ |
| pes = av_mallocz(sizeof(PESContext)); |
| if (!pes) |
| return 0; |
| pes->ts = ts; |
| pes->stream = ts->stream; |
| pes->pid = pid; |
| pes->pcr_pid = pcr_pid; |
| pes->state = MPEGTS_SKIP; |
| pes->pts = AV_NOPTS_VALUE; |
| pes->dts = AV_NOPTS_VALUE; |
| tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes); |
| if (!tss) { |
| av_free(pes); |
| return 0; |
| } |
| return pes; |
| } |
| |
| static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size, |
| int *es_id, uint8_t **dec_config_descr, |
| int *dec_config_descr_size) |
| { |
| AVIOContext pb; |
| int tag; |
| unsigned len; |
| |
| ffio_init_context(&pb, buf, size, 0, NULL, NULL, NULL, NULL); |
| |
| len = ff_mp4_read_descr(s, &pb, &tag); |
| if (tag == MP4IODescrTag) { |
| avio_rb16(&pb); // ID |
| avio_r8(&pb); |
| avio_r8(&pb); |
| avio_r8(&pb); |
| avio_r8(&pb); |
| avio_r8(&pb); |
| len = ff_mp4_read_descr(s, &pb, &tag); |
| if (tag == MP4ESDescrTag) { |
| *es_id = avio_rb16(&pb); /* ES_ID */ |
| av_dlog(s, "ES_ID %#x\n", *es_id); |
| avio_r8(&pb); /* priority */ |
| len = ff_mp4_read_descr(s, &pb, &tag); |
| if (tag == MP4DecConfigDescrTag) { |
| *dec_config_descr = av_malloc(len); |
| if (!*dec_config_descr) |
| return AVERROR(ENOMEM); |
| *dec_config_descr_size = len; |
| avio_read(&pb, *dec_config_descr, len); |
| } |
| } |
| } |
| return 0; |
| } |
| |
| int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type, |
| const uint8_t **pp, const uint8_t *desc_list_end, |
| int mp4_dec_config_descr_len, int mp4_es_id, int pid, |
| uint8_t *mp4_dec_config_descr) |
| { |
| const uint8_t *desc_end; |
| int desc_len, desc_tag; |
| char language[252]; |
| int i; |
| |
| desc_tag = get8(pp, desc_list_end); |
| if (desc_tag < 0) |
| return -1; |
| desc_len = get8(pp, desc_list_end); |
| if (desc_len < 0) |
| return -1; |
| desc_end = *pp + desc_len; |
| if (desc_end > desc_list_end) |
| return -1; |
| |
| av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len); |
| |
| if (st->codec->codec_id == CODEC_ID_NONE && |
| stream_type == STREAM_TYPE_PRIVATE_DATA) |
| mpegts_find_stream_type(st, desc_tag, DESC_types); |
| |
| switch(desc_tag) { |
| case 0x1F: /* FMC descriptor */ |
| get16(pp, desc_end); |
| if (st->codec->codec_id == CODEC_ID_AAC_LATM && |
| mp4_dec_config_descr_len && mp4_es_id == pid) { |
| AVIOContext pb; |
| ffio_init_context(&pb, mp4_dec_config_descr, |
| mp4_dec_config_descr_len, 0, NULL, NULL, NULL, NULL); |
| ff_mp4_read_dec_config_descr(fc, st, &pb); |
| if (st->codec->codec_id == CODEC_ID_AAC && |
| st->codec->extradata_size > 0) |
| st->need_parsing = 0; |
| } |
| break; |
| case 0x56: /* DVB teletext descriptor */ |
| language[0] = get8(pp, desc_end); |
| language[1] = get8(pp, desc_end); |
| language[2] = get8(pp, desc_end); |
| language[3] = 0; |
| av_dict_set(&st->metadata, "language", language, 0); |
| break; |
| case 0x59: /* subtitling descriptor */ |
| language[0] = get8(pp, desc_end); |
| language[1] = get8(pp, desc_end); |
| language[2] = get8(pp, desc_end); |
| language[3] = 0; |
| /* hearing impaired subtitles detection */ |
| switch(get8(pp, desc_end)) { |
| case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */ |
| case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */ |
| case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */ |
| case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */ |
| case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */ |
| case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */ |
| st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; |
| break; |
| } |
| if (st->codec->extradata) { |
| if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4)) |
| av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n"); |
| } else { |
| st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE); |
| if (st->codec->extradata) { |
| st->codec->extradata_size = 4; |
| memcpy(st->codec->extradata, *pp, 4); |
| } |
| } |
| *pp += 4; |
| av_dict_set(&st->metadata, "language", language, 0); |
| break; |
| case 0x0a: /* ISO 639 language descriptor */ |
| for (i = 0; i + 4 <= desc_len; i += 4) { |
| language[i + 0] = get8(pp, desc_end); |
| language[i + 1] = get8(pp, desc_end); |
| language[i + 2] = get8(pp, desc_end); |
| language[i + 3] = ','; |
| switch (get8(pp, desc_end)) { |
| case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break; |
| case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break; |
| case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break; |
| } |
| } |
| if (i) { |
| language[i - 1] = 0; |
| av_dict_set(&st->metadata, "language", language, 0); |
| } |
| break; |
| case 0x05: /* registration descriptor */ |
| st->codec->codec_tag = bytestream_get_le32(pp); |
| av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag); |
| if (st->codec->codec_id == CODEC_ID_NONE && |
| stream_type == STREAM_TYPE_PRIVATE_DATA) |
| mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types); |
| break; |
| case 0x52: /* stream identifier descriptor */ |
| st->stream_identifier = 1 + get8(pp, desc_end); |
| break; |
| default: |
| break; |
| } |
| *pp = desc_end; |
| return 0; |
| } |
| |
| static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) |
| { |
| MpegTSContext *ts = filter->u.section_filter.opaque; |
| SectionHeader h1, *h = &h1; |
| PESContext *pes; |
| AVStream *st; |
| const uint8_t *p, *p_end, *desc_list_end; |
| int program_info_length, pcr_pid, pid, stream_type; |
| int desc_list_len; |
| uint32_t prog_reg_desc = 0; /* registration descriptor */ |
| uint8_t *mp4_dec_config_descr = NULL; |
| int mp4_dec_config_descr_len = 0; |
| int mp4_es_id = 0; |
| |
| av_dlog(ts->stream, "PMT: len %i\n", section_len); |
| hex_dump_debug(ts->stream, (uint8_t *)section, section_len); |
| |
| p_end = section + section_len - 4; |
| p = section; |
| if (parse_section_header(h, &p, p_end) < 0) |
| return; |
| |
| av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n", |
| h->id, h->sec_num, h->last_sec_num); |
| |
| if (h->tid != PMT_TID) |
| return; |
| |
| clear_program(ts, h->id); |
| pcr_pid = get16(&p, p_end) & 0x1fff; |
| if (pcr_pid < 0) |
| return; |
| add_pid_to_pmt(ts, h->id, pcr_pid); |
| set_pcr_pid(ts->stream, h->id, pcr_pid); |
| |
| av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid); |
| |
| program_info_length = get16(&p, p_end) & 0xfff; |
| if (program_info_length < 0) |
| return; |
| while(program_info_length >= 2) { |
| uint8_t tag, len; |
| tag = get8(&p, p_end); |
| len = get8(&p, p_end); |
| |
| av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len); |
| |
| if(len > program_info_length - 2) |
| //something else is broken, exit the program_descriptors_loop |
| break; |
| program_info_length -= len + 2; |
| if (tag == 0x1d) { // IOD descriptor |
| get8(&p, p_end); // scope |
| get8(&p, p_end); // label |
| len -= 2; |
| mp4_read_iods(ts->stream, p, len, &mp4_es_id, |
| &mp4_dec_config_descr, &mp4_dec_config_descr_len); |
| } else if (tag == 0x05 && len >= 4) { // registration descriptor |
| prog_reg_desc = bytestream_get_le32(&p); |
| len -= 4; |
| } |
| p += len; |
| } |
| p += program_info_length; |
| if (p >= p_end) |
| goto out; |
| |
| // stop parsing after pmt, we found header |
| if (!ts->stream->nb_streams) |
| ts->stop_parse = 2; |
| |
| for(;;) { |
| st = 0; |
| stream_type = get8(&p, p_end); |
| if (stream_type < 0) |
| break; |
| pid = get16(&p, p_end) & 0x1fff; |
| if (pid < 0) |
| break; |
| |
| /* now create ffmpeg stream */ |
| if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) { |
| pes = ts->pids[pid]->u.pes_filter.opaque; |
| if (!pes->st) |
| pes->st = av_new_stream(pes->stream, pes->pid); |
| 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); |
| if (pes) |
| st = av_new_stream(pes->stream, pes->pid); |
| } |
| |
| if (!st) |
| goto out; |
| |
| if (!pes->stream_type) |
| mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc); |
| |
| add_pid_to_pmt(ts, h->id, pid); |
| |
| ff_program_add_stream_index(ts->stream, h->id, st->index); |
| |
| desc_list_len = get16(&p, p_end) & 0xfff; |
| if (desc_list_len < 0) |
| break; |
| desc_list_end = p + desc_list_len; |
| if (desc_list_end > p_end) |
| break; |
| for(;;) { |
| if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end, |
| mp4_dec_config_descr_len, mp4_es_id, pid, mp4_dec_config_descr) < 0) |
| break; |
| |
| if (prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) { |
| ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index); |
| pes->sub_st->codec->codec_tag = st->codec->codec_tag; |
| } |
| } |
| p = desc_list_end; |
| } |
| |
| out: |
| av_free(mp4_dec_config_descr); |
| } |
| |
| static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) |
| { |
| MpegTSContext *ts = filter->u.section_filter.opaque; |
| SectionHeader h1, *h = &h1; |
| const uint8_t *p, *p_end; |
| int sid, pmt_pid; |
| AVProgram *program; |
| |
| av_dlog(ts->stream, "PAT:\n"); |
| hex_dump_debug(ts->stream, (uint8_t *)section, section_len); |
| |
| p_end = section + section_len - 4; |
| p = section; |
| if (parse_section_header(h, &p, p_end) < 0) |
| return; |
| if (h->tid != PAT_TID) |
| return; |
| |
| ts->stream->ts_id = h->id; |
| |
| clear_programs(ts); |
| for(;;) { |
| sid = get16(&p, p_end); |
| if (sid < 0) |
| break; |
| pmt_pid = get16(&p, p_end) & 0x1fff; |
| if (pmt_pid < 0) |
| break; |
| |
| av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid); |
| |
| if (sid == 0x0000) { |
| /* NIT info */ |
| } else { |
| program = av_new_program(ts->stream, sid); |
| program->program_num = sid; |
| program->pmt_pid = pmt_pid; |
| if (ts->pids[pmt_pid]) |
| mpegts_close_filter(ts, ts->pids[pmt_pid]); |
| mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1); |
| add_pat_entry(ts, sid); |
| add_pid_to_pmt(ts, sid, 0); //add pat pid to program |
| add_pid_to_pmt(ts, sid, pmt_pid); |
| } |
| } |
| } |
| |
| static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) |
| { |
| MpegTSContext *ts = filter->u.section_filter.opaque; |
| SectionHeader h1, *h = &h1; |
| const uint8_t *p, *p_end, *desc_list_end, *desc_end; |
| int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type; |
| char *name, *provider_name; |
| |
| av_dlog(ts->stream, "SDT:\n"); |
| hex_dump_debug(ts->stream, (uint8_t *)section, section_len); |
| |
| p_end = section + section_len - 4; |
| p = section; |
| if (parse_section_header(h, &p, p_end) < 0) |
| return; |
| if (h->tid != SDT_TID) |
| return; |
| onid = get16(&p, p_end); |
| if (onid < 0) |
| return; |
| val = get8(&p, p_end); |
| if (val < 0) |
| return; |
| for(;;) { |
| sid = get16(&p, p_end); |
| if (sid < 0) |
| break; |
| val = get8(&p, p_end); |
| if (val < 0) |
| break; |
| desc_list_len = get16(&p, p_end) & 0xfff; |
| if (desc_list_len < 0) |
| break; |
| desc_list_end = p + desc_list_len; |
| if (desc_list_end > p_end) |
| break; |
| for(;;) { |
| desc_tag = get8(&p, desc_list_end); |
| if (desc_tag < 0) |
| break; |
| desc_len = get8(&p, desc_list_end); |
| desc_end = p + desc_len; |
| if (desc_end > desc_list_end) |
| break; |
| |
| av_dlog(ts->stream, "tag: 0x%02x len=%d\n", |
| desc_tag, desc_len); |
| |
| switch(desc_tag) { |
| case 0x48: |
| service_type = get8(&p, p_end); |
| if (service_type < 0) |
| break; |
| provider_name = getstr8(&p, p_end); |
| if (!provider_name) |
| break; |
| name = getstr8(&p, p_end); |
| if (name) { |
| AVProgram *program = av_new_program(ts->stream, sid); |
| if(program) { |
| av_dict_set(&program->metadata, "service_name", name, 0); |
| av_dict_set(&program->metadata, "service_provider", provider_name, 0); |
| } |
| } |
| av_free(name); |
| av_free(provider_name); |
| break; |
| default: |
| break; |
| } |
| p = desc_end; |
| } |
| p = desc_list_end; |
| } |
| } |
| |
| /* handle one TS packet */ |
| static int handle_packet(MpegTSContext *ts, const uint8_t *packet) |
| { |
| AVFormatContext *s = ts->stream; |
| MpegTSFilter *tss; |
| int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity, |
| has_adaptation, has_payload; |
| const uint8_t *p, *p_end; |
| int64_t pos; |
| |
| pid = AV_RB16(packet + 1) & 0x1fff; |
| if(pid && discard_pid(ts, pid)) |
| return 0; |
| is_start = packet[1] & 0x40; |
| tss = ts->pids[pid]; |
| if (ts->auto_guess && tss == NULL && is_start) { |
| add_pes_stream(ts, pid, -1); |
| tss = ts->pids[pid]; |
| } |
| if (!tss) |
| return 0; |
| |
| afc = (packet[3] >> 4) & 3; |
| if (afc == 0) /* reserved value */ |
| return 0; |
| has_adaptation = afc & 2; |
| has_payload = afc & 1; |
| is_discontinuity = has_adaptation |
| && packet[4] != 0 /* with length > 0 */ |
| && (packet[5] & 0x80); /* and discontinuity indicated */ |
| |
| /* continuity check (currently not used) */ |
| cc = (packet[3] & 0xf); |
| expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc; |
| cc_ok = pid == 0x1FFF // null packet PID |
| || is_discontinuity |
| || tss->last_cc < 0 |
| || expected_cc == cc; |
| |
| tss->last_cc = cc; |
| if (!cc_ok) { |
| av_log(ts, AV_LOG_WARNING, "Continuity Check Failed\n"); |
| if(tss->type == MPEGTS_PES) { |
| PESContext *pc = tss->u.pes_filter.opaque; |
| pc->flags |= AV_PKT_FLAG_CORRUPT; |
| } |
| } |
| |
| if (!has_payload) |
| return 0; |
| p = packet + 4; |
| if (has_adaptation) { |
| /* skip adapation field */ |
| p += p[0] + 1; |
| } |
| /* if past the end of packet, ignore */ |
| p_end = packet + TS_PACKET_SIZE; |
| if (p >= p_end) |
| return 0; |
| |
| pos = avio_tell(ts->stream->pb); |
| ts->pos47= pos % ts->raw_packet_size; |
| |
| if (tss->type == MPEGTS_SECTION) { |
| if (is_start) { |
| /* pointer field present */ |
| len = *p++; |
| if (p + len > p_end) |
| return 0; |
| if (len && cc_ok) { |
| /* write remaining section bytes */ |
| write_section_data(s, tss, |
| p, len, 0); |
| /* check whether filter has been closed */ |
| if (!ts->pids[pid]) |
| return 0; |
| } |
| p += len; |
| if (p < p_end) { |
| write_section_data(s, tss, |
| p, p_end - p, 1); |
| } |
| } else { |
| if (cc_ok) { |
| write_section_data(s, tss, |
| p, p_end - p, 0); |
| } |
| } |
| } else { |
| int ret; |
| // Note: The position here points actually behind the current packet. |
| if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start, |
| pos - ts->raw_packet_size)) < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* XXX: try to find a better synchro over several packets (use |
| get_packet_size() ?) */ |
| static int mpegts_resync(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| int c, i; |
| |
| for(i = 0;i < MAX_RESYNC_SIZE; i++) { |
| c = avio_r8(pb); |
| if (url_feof(pb)) |
| return -1; |
| if (c == 0x47) { |
| avio_seek(pb, -1, SEEK_CUR); |
| return 0; |
| } |
| } |
| av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n"); |
| /* no sync found */ |
| return -1; |
| } |
| |
| /* return -1 if error or EOF. Return 0 if OK. */ |
| static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size) |
| { |
| AVIOContext *pb = s->pb; |
| int skip, len; |
| |
| for(;;) { |
| len = avio_read(pb, buf, TS_PACKET_SIZE); |
| if (len != TS_PACKET_SIZE) |
| return len < 0 ? len : AVERROR_EOF; |
| /* check paquet sync byte */ |
| if (buf[0] != 0x47) { |
| /* find a new packet start */ |
| avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR); |
| if (mpegts_resync(s) < 0) |
| return AVERROR(EAGAIN); |
| else |
| continue; |
| } else { |
| skip = raw_packet_size - TS_PACKET_SIZE; |
| if (skip > 0) |
| avio_skip(pb, skip); |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| static int handle_packets(MpegTSContext *ts, int nb_packets) |
| { |
| AVFormatContext *s = ts->stream; |
| uint8_t packet[TS_PACKET_SIZE]; |
| int packet_num, ret = 0; |
| |
| if (avio_tell(s->pb) != ts->last_pos) { |
| int i; |
| // av_dlog("Skipping after seek\n"); |
| /* seek detected, flush pes buffer */ |
| for (i = 0; i < NB_PID_MAX; i++) { |
| if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) { |
| PESContext *pes = ts->pids[i]->u.pes_filter.opaque; |
| av_freep(&pes->buffer); |
| ts->pids[i]->last_cc = -1; |
| pes->data_index = 0; |
| pes->state = MPEGTS_SKIP; /* skip until pes header */ |
| } |
| } |
| } |
| |
| ts->stop_parse = 0; |
| packet_num = 0; |
| for(;;) { |
| packet_num++; |
| if (nb_packets != 0 && packet_num >= nb_packets || |
| ts->stop_parse > 1) { |
| ret = AVERROR(EAGAIN); |
| break; |
| } |
| if (ts->stop_parse > 0) |
| break; |
| |
| ret = read_packet(s, packet, ts->raw_packet_size); |
| if (ret != 0) |
| break; |
| ret = handle_packet(ts, packet); |
| if (ret != 0) |
| break; |
| } |
| ts->last_pos = avio_tell(s->pb); |
| return ret; |
| } |
| |
| static int mpegts_probe(AVProbeData *p) |
| { |
| #if 1 |
| const int size= p->buf_size; |
| int score, fec_score, dvhs_score; |
| int check_count= size / TS_FEC_PACKET_SIZE; |
| #define CHECK_COUNT 10 |
| |
| if (check_count < CHECK_COUNT) |
| return -1; |
| |
| score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count; |
| dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count; |
| fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count; |
| // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score); |
| |
| // we need a clear definition for the returned score otherwise things will become messy sooner or later |
| if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT; |
| else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT; |
| else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT; |
| else return -1; |
| #else |
| /* only use the extension for safer guess */ |
| if (av_match_ext(p->filename, "ts")) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| #endif |
| } |
| |
| /* return the 90kHz PCR and the extension for the 27MHz PCR. return |
| (-1) if not available */ |
| static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, |
| const uint8_t *packet) |
| { |
| int afc, len, flags; |
| const uint8_t *p; |
| unsigned int v; |
| |
| afc = (packet[3] >> 4) & 3; |
| if (afc <= 1) |
| return -1; |
| p = packet + 4; |
| len = p[0]; |
| p++; |
| if (len == 0) |
| return -1; |
| flags = *p++; |
| len--; |
| if (!(flags & 0x10)) |
| return -1; |
| if (len < 6) |
| return -1; |
| v = AV_RB32(p); |
| *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7); |
| *ppcr_low = ((p[4] & 1) << 8) | p[5]; |
| return 0; |
| } |
| |
| static int mpegts_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| MpegTSContext *ts = s->priv_data; |
| AVIOContext *pb = s->pb; |
| uint8_t buf[8*1024]; |
| int len; |
| int64_t pos; |
| |
| #if FF_API_FORMAT_PARAMETERS |
| if (ap) { |
| if (ap->mpeg2ts_compute_pcr) |
| ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr; |
| } |
| #endif |
| |
| /* read the first 1024 bytes to get packet size */ |
| pos = avio_tell(pb); |
| len = avio_read(pb, buf, sizeof(buf)); |
| if (len != sizeof(buf)) |
| goto fail; |
| ts->raw_packet_size = get_packet_size(buf, sizeof(buf)); |
| if (ts->raw_packet_size <= 0) { |
| av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n"); |
| ts->raw_packet_size = TS_PACKET_SIZE; |
| } |
| ts->stream = s; |
| ts->auto_guess = 0; |
| |
| if (s->iformat == &ff_mpegts_demuxer) { |
| /* normal demux */ |
| |
| /* first do a scaning to get all the services */ |
| if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0) |
| av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n"); |
| |
| mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1); |
| |
| mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1); |
| |
| handle_packets(ts, s->probesize / ts->raw_packet_size); |
| /* if could not find service, enable auto_guess */ |
| |
| ts->auto_guess = 1; |
| |
| av_dlog(ts->stream, "tuning done\n"); |
| |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| } else { |
| AVStream *st; |
| int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l; |
| int64_t pcrs[2], pcr_h; |
| int packet_count[2]; |
| uint8_t packet[TS_PACKET_SIZE]; |
| |
| /* only read packets */ |
| |
| st = av_new_stream(s, 0); |
| if (!st) |
| goto fail; |
| av_set_pts_info(st, 60, 1, 27000000); |
| st->codec->codec_type = AVMEDIA_TYPE_DATA; |
| st->codec->codec_id = CODEC_ID_MPEG2TS; |
| |
| /* we iterate until we find two PCRs to estimate the bitrate */ |
| pcr_pid = -1; |
| nb_pcrs = 0; |
| nb_packets = 0; |
| for(;;) { |
| ret = read_packet(s, packet, ts->raw_packet_size); |
| if (ret < 0) |
| return -1; |
| pid = AV_RB16(packet + 1) & 0x1fff; |
| if ((pcr_pid == -1 || pcr_pid == pid) && |
| parse_pcr(&pcr_h, &pcr_l, packet) == 0) { |
| pcr_pid = pid; |
| packet_count[nb_pcrs] = nb_packets; |
| pcrs[nb_pcrs] = pcr_h * 300 + pcr_l; |
| nb_pcrs++; |
| if (nb_pcrs >= 2) |
| break; |
| } |
| nb_packets++; |
| } |
| |
| /* NOTE1: the bitrate is computed without the FEC */ |
| /* NOTE2: it is only the bitrate of the start of the stream */ |
| ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]); |
| ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0]; |
| s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr; |
| st->codec->bit_rate = s->bit_rate; |
| st->start_time = ts->cur_pcr; |
| av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n", |
| st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr); |
| } |
| |
| avio_seek(pb, pos, SEEK_SET); |
| return 0; |
| fail: |
| return -1; |
| } |
| |
| #define MAX_PACKET_READAHEAD ((128 * 1024) / 188) |
| |
| static int mpegts_raw_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| MpegTSContext *ts = s->priv_data; |
| int ret, i; |
| int64_t pcr_h, next_pcr_h, pos; |
| int pcr_l, next_pcr_l; |
| uint8_t pcr_buf[12]; |
| |
| if (av_new_packet(pkt, TS_PACKET_SIZE) < 0) |
| return AVERROR(ENOMEM); |
| pkt->pos= avio_tell(s->pb); |
| ret = read_packet(s, pkt->data, ts->raw_packet_size); |
| if (ret < 0) { |
| av_free_packet(pkt); |
| return ret; |
| } |
| if (ts->mpeg2ts_compute_pcr) { |
| /* compute exact PCR for each packet */ |
| if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) { |
| /* we read the next PCR (XXX: optimize it by using a bigger buffer */ |
| pos = avio_tell(s->pb); |
| for(i = 0; i < MAX_PACKET_READAHEAD; i++) { |
| avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET); |
| avio_read(s->pb, pcr_buf, 12); |
| if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) { |
| /* XXX: not precise enough */ |
| ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) / |
| (i + 1); |
| break; |
| } |
| } |
| avio_seek(s->pb, pos, SEEK_SET); |
| /* no next PCR found: we use previous increment */ |
| ts->cur_pcr = pcr_h * 300 + pcr_l; |
| } |
| pkt->pts = ts->cur_pcr; |
| pkt->duration = ts->pcr_incr; |
| ts->cur_pcr += ts->pcr_incr; |
| } |
| pkt->stream_index = 0; |
| return 0; |
| } |
| |
| static int mpegts_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| MpegTSContext *ts = s->priv_data; |
| int ret, i; |
| |
| ts->pkt = pkt; |
| ret = handle_packets(ts, 0); |
| if (ret < 0) { |
| /* flush pes data left */ |
| for (i = 0; i < NB_PID_MAX; i++) { |
| if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) { |
| PESContext *pes = ts->pids[i]->u.pes_filter.opaque; |
| if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) { |
| new_pes_packet(pes, pkt); |
| pes->state = MPEGTS_SKIP; |
| ret = 0; |
| break; |
| } |
| } |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int mpegts_read_close(AVFormatContext *s) |
| { |
| MpegTSContext *ts = s->priv_data; |
| int i; |
| |
| clear_programs(ts); |
| |
| for(i=0;i<NB_PID_MAX;i++) |
| if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]); |
| |
| return 0; |
| } |
| |
| static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, |
| int64_t *ppos, int64_t pos_limit) |
| { |
| MpegTSContext *ts = s->priv_data; |
| int64_t pos, timestamp; |
| uint8_t buf[TS_PACKET_SIZE]; |
| int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid; |
| 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(;;) { |
| avio_seek(s->pb, pos, SEEK_SET); |
| if (avio_read(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; |
| avio_seek(s->pb, pos, SEEK_SET); |
| if (avio_read(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; |
| } |
| |
| #ifdef USE_SYNCPOINT_SEARCH |
| |
| static int read_seek2(AVFormatContext *s, |
| int stream_index, |
| int64_t min_ts, |
| int64_t target_ts, |
| int64_t max_ts, |
| int flags) |
| { |
| int64_t pos; |
| |
| int64_t ts_ret, ts_adj; |
| int stream_index_gen_search; |
| AVStream *st; |
| AVParserState *backup; |
| |
| backup = ff_store_parser_state(s); |
| |
| // detect direction of seeking for search purposes |
| flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ? |
| AVSEEK_FLAG_BACKWARD : 0; |
| |
| if (flags & AVSEEK_FLAG_BYTE) { |
| // use position directly, we will search starting from it |
| pos = target_ts; |
| } else { |
| // search for some position with good timestamp match |
| if (stream_index < 0) { |
| stream_index_gen_search = av_find_default_stream_index(s); |
| if (stream_index_gen_search < 0) { |
| ff_restore_parser_state(s, backup); |
| return -1; |
| } |
| |
| st = s->streams[stream_index_gen_search]; |
| // timestamp for default must be expressed in AV_TIME_BASE units |
| ts_adj = av_rescale(target_ts, |
| st->time_base.den, |
| AV_TIME_BASE * (int64_t)st->time_base.num); |
| } else { |
| ts_adj = target_ts; |
| stream_index_gen_search = stream_index; |
| } |
| pos = av_gen_search(s, stream_index_gen_search, ts_adj, |
| 0, INT64_MAX, -1, |
| AV_NOPTS_VALUE, |
| AV_NOPTS_VALUE, |
| flags, &ts_ret, mpegts_get_pcr); |
| if (pos < 0) { |
| ff_restore_parser_state(s, backup); |
| return -1; |
| } |
| } |
| |
| // search for actual matching keyframe/starting position for all streams |
| if (ff_gen_syncpoint_search(s, stream_index, pos, |
| min_ts, target_ts, max_ts, |
| flags) < 0) { |
| ff_restore_parser_state(s, backup); |
| return -1; |
| } |
| |
| ff_free_parser_state(s, backup); |
| return 0; |
| } |
| |
| static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags) |
| { |
| int ret; |
| if (flags & AVSEEK_FLAG_BACKWARD) { |
| flags &= ~AVSEEK_FLAG_BACKWARD; |
| ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags); |
| if (ret < 0) |
| // for compatibility reasons, seek to the best-fitting timestamp |
| ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags); |
| } else { |
| ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags); |
| if (ret < 0) |
| // for compatibility reasons, seek to the best-fitting timestamp |
| ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags); |
| } |
| return ret; |
| } |
| |
| #else |
| |
| 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= avio_tell(s->pb); |
| |
| for(;;) { |
| avio_seek(s->pb, pos, SEEK_SET); |
| if (avio_read(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; |
| } |
| avio_seek(s->pb, pos, SEEK_SET); |
| |
| return 0; |
| } |
| |
| #endif |
| |
| /**************************************************************/ |
| /* parsing functions - called from other demuxers such as RTP */ |
| |
| MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s) |
| { |
| MpegTSContext *ts; |
| |
| ts = av_mallocz(sizeof(MpegTSContext)); |
| if (!ts) |
| return NULL; |
| /* no stream case, currently used by RTP */ |
| ts->raw_packet_size = TS_PACKET_SIZE; |
| ts->stream = s; |
| ts->auto_guess = 1; |
| return ts; |
| } |
| |
| /* return the consumed length if a packet was output, or -1 if no |
| packet is output */ |
| int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, |
| const uint8_t *buf, int len) |
| { |
| int len1; |
| |
| len1 = len; |
| ts->pkt = pkt; |
| for(;;) { |
| ts->stop_parse = 0; |
| if (len < TS_PACKET_SIZE) |
| return -1; |
| if (buf[0] != 0x47) { |
| buf++; |
| len--; |
| } else { |
| handle_packet(ts, buf); |
| buf += TS_PACKET_SIZE; |
| len -= TS_PACKET_SIZE; |
| if (ts->stop_parse == 1) |
| break; |
| } |
| } |
| return len1 - len; |
| } |
| |
| void ff_mpegts_parse_close(MpegTSContext *ts) |
| { |
| int i; |
| |
| for(i=0;i<NB_PID_MAX;i++) |
| av_free(ts->pids[i]); |
| av_free(ts); |
| } |
| |
| AVInputFormat ff_mpegts_demuxer = { |
| .name = "mpegts", |
| .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), |
| .priv_data_size = sizeof(MpegTSContext), |
| .read_probe = mpegts_probe, |
| .read_header = mpegts_read_header, |
| .read_packet = mpegts_read_packet, |
| .read_close = mpegts_read_close, |
| .read_seek = read_seek, |
| .read_timestamp = mpegts_get_pcr, |
| .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT, |
| #ifdef USE_SYNCPOINT_SEARCH |
| .read_seek2 = read_seek2, |
| #endif |
| }; |
| |
| AVInputFormat ff_mpegtsraw_demuxer = { |
| .name = "mpegtsraw", |
| .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"), |
| .priv_data_size = sizeof(MpegTSContext), |
| .read_header = mpegts_read_header, |
| .read_packet = mpegts_raw_read_packet, |
| .read_close = mpegts_read_close, |
| .read_seek = read_seek, |
| .read_timestamp = mpegts_get_pcr, |
| .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT, |
| #ifdef USE_SYNCPOINT_SEARCH |
| .read_seek2 = read_seek2, |
| #endif |
| .priv_class = &mpegtsraw_class, |
| }; |