diff options
Diffstat (limited to 'ffmpeg1/libavformat/mpegts.c')
| -rw-r--r-- | ffmpeg1/libavformat/mpegts.c | 2313 |
1 files changed, 2313 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/mpegts.c b/ffmpeg1/libavformat/mpegts.c new file mode 100644 index 0000000..85b5146 --- /dev/null +++ b/ffmpeg1/libavformat/mpegts.c @@ -0,0 +1,2313 @@ +/* + * 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/buffer.h" +#include "libavutil/crc.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/log.h" +#include "libavutil/dict.h" +#include "libavutil/mathematics.h" +#include "libavutil/opt.h" +#include "libavutil/avassert.h" +#include "libavcodec/bytestream.h" +#include "libavcodec/get_bits.h" +#include "avformat.h" +#include "mpegts.h" +#include "internal.h" +#include "avio_internal.h" +#include "seek.h" +#include "mpeg.h" +#include "isom.h" + +/* maximum size in which we look for synchronisation if + synchronisation is lost */ +#define MAX_RESYNC_SIZE 65536 + +#define MAX_PES_PAYLOAD 200*1024 + +#define MAX_MP4_DESCR_COUNT 16 + +enum MpegTSFilterType { + MPEGTS_PES, + MPEGTS_SECTION, +}; + +typedef struct MpegTSFilter MpegTSFilter; + +typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos); + +typedef struct MpegTSPESFilter { + PESCallback *pes_cb; + void *opaque; +} MpegTSPESFilter; + +typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len); + +typedef void SetServiceCallback(void *opaque, int ret); + +typedef struct MpegTSSectionFilter { + int section_index; + int section_h_size; + uint8_t *section_buf; + unsigned int check_crc:1; + unsigned int end_of_section_reached:1; + SectionCallback *section_cb; + void *opaque; +} MpegTSSectionFilter; + +struct MpegTSFilter { + int pid; + int es_id; + int last_cc; /* last cc code (-1 if first packet) */ + enum MpegTSFilterType type; + union { + MpegTSPESFilter pes_filter; + MpegTSSectionFilter section_filter; + } u; +}; + +#define MAX_PIDS_PER_PROGRAM 64 +struct Program { + unsigned int id; //program id/service id + unsigned int nb_pids; + unsigned int pids[MAX_PIDS_PER_PROGRAM]; +}; + +struct MpegTSContext { + const AVClass *class; + /* user data */ + AVFormatContext *stream; + /** raw packet size, including FEC if present */ + int raw_packet_size; + + int pos47; + + /** if true, all pids are analyzed to find streams */ + int auto_guess; + + /** compute exact PCR for each transport stream packet */ + int mpeg2ts_compute_pcr; + + int64_t cur_pcr; /**< used to estimate the exact PCR */ + int pcr_incr; /**< used to estimate the exact PCR */ + + /* data needed to handle file based ts */ + /** stop parsing loop */ + int stop_parse; + /** packet containing Audio/Video data */ + AVPacket *pkt; + /** to detect seek */ + int64_t last_pos; + + /******************************************/ + /* private mpegts data */ + /* scan context */ + /** structure to keep track of Program->pids mapping */ + unsigned int nb_prg; + struct Program *prg; + + int8_t crc_validity[NB_PID_MAX]; + + /** filters for various streams specified by PMT + for the PAT and PMT */ + MpegTSFilter *pids[NB_PID_MAX]; + int current_pid; +}; + +static const AVOption options[] = { + {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT, + {.i64 = 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]; + AVBufferRef *buffer; + SLConfigDescr sl; +} PESContext; + +extern AVInputFormat ff_mpegts_demuxer; + +static void clear_avprogram(MpegTSContext *ts, unsigned int programid) +{ + AVProgram *prg = NULL; + int i; + for(i=0; i<ts->stream->nb_programs; i++) + if(ts->stream->programs[i]->id == programid){ + prg = ts->stream->programs[i]; + break; + } + if (!prg) + return; + prg->nb_stream_indexes = 0; +} + +static void clear_program(MpegTSContext *ts, unsigned int programid) +{ + int i; + + clear_avprogram(ts, programid); + 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) +{ + MpegTSContext *ts = s->priv_data; + 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) { + int crc_valid = 1; + tss->end_of_section_reached = 1; + + if (tss->check_crc){ + crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size); + if (crc_valid){ + ts->crc_validity[ tss1->pid ] = 100; + }else if(ts->crc_validity[ tss1->pid ] > -10){ + ts->crc_validity[ tss1->pid ]--; + }else + crc_valid = 2; + } + if (crc_valid) + tss->section_cb(tss1, tss->section_buf, tss->section_h_size); + } +} + +static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, + SectionCallback *section_cb, void *opaque, + int check_crc) + +{ + MpegTSFilter *filter; + MpegTSSectionFilter *sec; + + av_dlog(ts->stream, "Filter: pid=0x%x\n", pid); + + if (pid >= NB_PID_MAX || ts->pids[pid]) + return NULL; + filter = av_mallocz(sizeof(MpegTSFilter)); + if (!filter) + return NULL; + ts->pids[pid] = filter; + filter->type = MPEGTS_SECTION; + filter->pid = pid; + filter->es_id = -1; + filter->last_cc = -1; + sec = &filter->u.section_filter; + sec->section_cb = section_cb; + sec->opaque = opaque; + sec->section_buf = av_malloc(MAX_SECTION_SIZE); + sec->check_crc = check_crc; + if (!sec->section_buf) { + av_free(filter); + return NULL; + } + return filter; +} + +static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, + PESCallback *pes_cb, + void *opaque) +{ + MpegTSFilter *filter; + MpegTSPESFilter *pes; + + if (pid >= NB_PID_MAX || ts->pids[pid]) + return NULL; + filter = av_mallocz(sizeof(MpegTSFilter)); + if (!filter) + return NULL; + ts->pids[pid] = filter; + filter->type = MPEGTS_PES; + filter->pid = pid; + filter->es_id = -1; + filter->last_cc = -1; + pes = &filter->u.pes_filter; + pes->pes_cb = pes_cb; + pes->opaque = opaque; + return filter; +} + +static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter) +{ + int pid; + + pid = filter->pid; + if (filter->type == MPEGTS_SECTION) + av_freep(&filter->u.section_filter.section_buf); + else if (filter->type == MPEGTS_PES) { + PESContext *pes = filter->u.pes_filter.opaque; + av_buffer_unref(&pes->buffer); + /* referenced private data will be freed later in + * avformat_close_input */ + if (!((PESContext *)filter->u.pes_filter.opaque)->st) { + av_freep(&filter->u.pes_filter.opaque); + } + } + + av_free(filter); + ts->pids[pid] = NULL; +} + +static int analyze(const uint8_t *buf, int size, int packet_size, int *index){ + int stat[TS_MAX_PACKET_SIZE]; + int i; + int x=0; + int best_score=0; + + memset(stat, 0, packet_size*sizeof(int)); + + for(x=i=0; i<size-3; i++){ + if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){ + stat[x]++; + if(stat[x] > best_score){ + best_score= stat[x]; + if(index) *index= x; + } + } + + x++; + if(x == packet_size) x= 0; + } + + return best_score; +} + +/* autodetect fec presence. Must have at least 1024 bytes */ +static int get_packet_size(const uint8_t *buf, int size) +{ + int score, fec_score, dvhs_score; + + if (size < (TS_FEC_PACKET_SIZE * 5 + 1)) + return -1; + + score = analyze(buf, size, TS_PACKET_SIZE, NULL); + dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL); + fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL); + av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n", + score, dvhs_score, fec_score); + + if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE; + else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE; + else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE; + else return -1; +} + +typedef struct SectionHeader { + uint8_t tid; + uint16_t id; + uint8_t version; + uint8_t sec_num; + uint8_t last_sec_num; +} SectionHeader; + +static inline int get8(const uint8_t **pp, const uint8_t *p_end) +{ + const uint8_t *p; + int c; + + p = *pp; + if (p >= p_end) + return -1; + c = *p++; + *pp = p; + return c; +} + +static inline int get16(const uint8_t **pp, const uint8_t *p_end) +{ + const uint8_t *p; + int c; + + p = *pp; + if ((p + 1) >= p_end) + return -1; + c = AV_RB16(p); + p += 2; + *pp = p; + return c; +} + +/* read and allocate a DVB string preceded by its length */ +static char *getstr8(const uint8_t **pp, const uint8_t *p_end) +{ + int len; + const uint8_t *p; + char *str; + + p = *pp; + len = get8(&p, p_end); + if (len < 0) + return NULL; + if ((p + len) > p_end) + return NULL; + str = av_malloc(len + 1); + if (!str) + return NULL; + memcpy(str, p, len); + str[len] = '\0'; + p += len; + *pp = p; + return str; +} + +static int parse_section_header(SectionHeader *h, + const uint8_t **pp, const uint8_t *p_end) +{ + int val; + + val = get8(pp, p_end); + if (val < 0) + return -1; + h->tid = val; + *pp += 2; + val = get16(pp, p_end); + if (val < 0) + return -1; + h->id = val; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->version = (val >> 1) & 0x1f; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->sec_num = val; + val = get8(pp, p_end); + if (val < 0) + return -1; + h->last_sec_num = val; + return 0; +} + +typedef struct { + uint32_t stream_type; + enum AVMediaType codec_type; + enum AVCodecID codec_id; +} StreamType; + +static const StreamType ISO_types[] = { + { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO }, + { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO }, + { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 }, + { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 }, + { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC }, + { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 }, + /* Makito encoder sets stream type 0x11 for AAC, + * so auto-detect LOAS/LATM instead of hardcoding it. */ +#if !CONFIG_LOAS_DEMUXER + { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */ +#endif + { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 }, + { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS }, + { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC }, + { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 }, + { 0 }, +}; + +static const StreamType HDMV_types[] = { + { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY }, + { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, + { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD }, + { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, + { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */ + { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/ + { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */ + { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */ + { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE }, + { 0 }, +}; + +/* ATSC ? */ +static const StreamType MISC_types[] = { + { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, + { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { 0 }, +}; + +static const StreamType REGD_types[] = { + { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC }, + { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, + { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M }, + { MKTAG('D','T','S','1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { MKTAG('D','T','S','2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { MKTAG('D','T','S','3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV }, + { MKTAG('V','C','-','1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 }, + { 0 }, +}; + +/* descriptor present */ +static const StreamType DESC_types[] = { + { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */ + { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */ + { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, + { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT }, + { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */ + { 0 }, +}; + +static void mpegts_find_stream_type(AVStream *st, + uint32_t stream_type, const StreamType *types) +{ + if (avcodec_is_open(st->codec)) { + av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n"); + return; + } + + for (; types->stream_type; types++) { + if (stream_type == types->stream_type) { + st->codec->codec_type = types->codec_type; + st->codec->codec_id = types->codec_id; + st->request_probe = 0; + return; + } + } +} + +static int mpegts_set_stream_info(AVStream *st, PESContext *pes, + uint32_t stream_type, uint32_t prog_reg_desc) +{ + int old_codec_type= st->codec->codec_type; + int old_codec_id = st->codec->codec_id; + + if (avcodec_is_open(st->codec)) { + av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n"); + return 0; + } + + avpriv_set_pts_info(st, 33, 1, 90000); + st->priv_data = pes; + st->codec->codec_type = AVMEDIA_TYPE_DATA; + st->codec->codec_id = AV_CODEC_ID_NONE; + st->need_parsing = AVSTREAM_PARSE_FULL; + pes->st = st; + pes->stream_type = stream_type; + + av_log(pes->stream, AV_LOG_DEBUG, + "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n", + st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc); + + st->codec->codec_tag = pes->stream_type; + + mpegts_find_stream_type(st, pes->stream_type, ISO_types); + if ((prog_reg_desc == AV_RL32("HDMV") || + prog_reg_desc == AV_RL32("HDPR")) && + st->codec->codec_id == AV_CODEC_ID_NONE) { + mpegts_find_stream_type(st, pes->stream_type, HDMV_types); + if (pes->stream_type == 0x83) { + // HDMV TrueHD streams also contain an AC3 coded version of the + // audio track - add a second stream for this + AVStream *sub_st; + // priv_data cannot be shared between streams + PESContext *sub_pes = av_malloc(sizeof(*sub_pes)); + if (!sub_pes) + return AVERROR(ENOMEM); + memcpy(sub_pes, pes, sizeof(*sub_pes)); + + sub_st = avformat_new_stream(pes->stream, NULL); + if (!sub_st) { + av_free(sub_pes); + return AVERROR(ENOMEM); + } + + sub_st->id = pes->pid; + avpriv_set_pts_info(sub_st, 33, 1, 90000); + sub_st->priv_data = sub_pes; + sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + sub_st->codec->codec_id = AV_CODEC_ID_AC3; + sub_st->need_parsing = AVSTREAM_PARSE_FULL; + sub_pes->sub_st = pes->sub_st = sub_st; + } + } + if (st->codec->codec_id == AV_CODEC_ID_NONE) + mpegts_find_stream_type(st, pes->stream_type, MISC_types); + if (st->codec->codec_id == AV_CODEC_ID_NONE){ + st->codec->codec_id = old_codec_id; + st->codec->codec_type= old_codec_type; + } + + return 0; +} + +static void new_pes_packet(PESContext *pes, AVPacket *pkt) +{ + av_init_packet(pkt); + + pkt->buf = pes->buffer; + pkt->data = pes->buffer->data; + pkt->size = pes->data_index; + + if(pes->total_size != MAX_PES_PAYLOAD && + pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) { + av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n"); + pes->flags |= AV_PKT_FLAG_CORRUPT; + } + memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE); + + // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID + if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76) + pkt->stream_index = pes->sub_st->index; + else + pkt->stream_index = pes->st->index; + pkt->pts = pes->pts; + pkt->dts = pes->dts; + /* store position of first TS packet of this PES packet */ + pkt->pos = pes->ts_packet_pos; + pkt->flags = pes->flags; + + /* reset pts values */ + pes->pts = AV_NOPTS_VALUE; + pes->dts = AV_NOPTS_VALUE; + pes->buffer = NULL; + pes->data_index = 0; + pes->flags = 0; +} + +static uint64_t get_ts64(GetBitContext *gb, int bits) +{ + if (get_bits_left(gb) < bits) + return AV_NOPTS_VALUE; + return get_bits64(gb, bits); +} + +static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size) +{ + GetBitContext gb; + int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0; + int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0; + int dts_flag = -1, cts_flag = -1; + int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE; + + init_get_bits(&gb, buf, buf_size*8); + + if (sl->use_au_start) + au_start_flag = get_bits1(&gb); + if (sl->use_au_end) + au_end_flag = get_bits1(&gb); + if (!sl->use_au_start && !sl->use_au_end) + au_start_flag = au_end_flag = 1; + if (sl->ocr_len > 0) + ocr_flag = get_bits1(&gb); + if (sl->use_idle) + idle_flag = get_bits1(&gb); + if (sl->use_padding) + padding_flag = get_bits1(&gb); + if (padding_flag) + padding_bits = get_bits(&gb, 3); + + if (!idle_flag && (!padding_flag || padding_bits != 0)) { + if (sl->packet_seq_num_len) + skip_bits_long(&gb, sl->packet_seq_num_len); + if (sl->degr_prior_len) + if (get_bits1(&gb)) + skip_bits(&gb, sl->degr_prior_len); + if (ocr_flag) + skip_bits_long(&gb, sl->ocr_len); + if (au_start_flag) { + if (sl->use_rand_acc_pt) + get_bits1(&gb); + if (sl->au_seq_num_len > 0) + skip_bits_long(&gb, sl->au_seq_num_len); + if (sl->use_timestamps) { + dts_flag = get_bits1(&gb); + cts_flag = get_bits1(&gb); + } + } + if (sl->inst_bitrate_len) + inst_bitrate_flag = get_bits1(&gb); + if (dts_flag == 1) + dts = get_ts64(&gb, sl->timestamp_len); + if (cts_flag == 1) + cts = get_ts64(&gb, sl->timestamp_len); + if (sl->au_len > 0) + skip_bits_long(&gb, sl->au_len); + if (inst_bitrate_flag) + skip_bits_long(&gb, sl->inst_bitrate_len); + } + + if (dts != AV_NOPTS_VALUE) + pes->dts = dts; + if (cts != AV_NOPTS_VALUE) + pes->pts = cts; + + if (sl->timestamp_len && sl->timestamp_res) + avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res); + + return (get_bits_count(&gb) + 7) >> 3; +} + +/* return non zero if a packet could be constructed */ +static int mpegts_push_data(MpegTSFilter *filter, + const uint8_t *buf, int buf_size, int is_start, + int64_t pos) +{ + PESContext *pes = filter->u.pes_filter.opaque; + MpegTSContext *ts = pes->ts; + const uint8_t *p; + int len, code; + + if(!ts->pkt) + return 0; + + if (is_start) { + if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) { + new_pes_packet(pes, ts->pkt); + ts->stop_parse = 1; + } + pes->state = MPEGTS_HEADER; + pes->data_index = 0; + pes->ts_packet_pos = pos; + } + p = buf; + while (buf_size > 0) { + switch(pes->state) { + case MPEGTS_HEADER: + len = PES_START_SIZE - pes->data_index; + if (len > buf_size) + len = buf_size; + memcpy(pes->header + pes->data_index, p, len); + pes->data_index += len; + p += len; + buf_size -= len; + if (pes->data_index == PES_START_SIZE) { + /* we got all the PES or section header. We can now + decide */ + if (pes->header[0] == 0x00 && pes->header[1] == 0x00 && + pes->header[2] == 0x01) { + /* it must be an mpeg2 PES stream */ + code = pes->header[3] | 0x100; + av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code); + + if ((pes->st && pes->st->discard == AVDISCARD_ALL && + (!pes->sub_st || pes->sub_st->discard == AVDISCARD_ALL)) || + code == 0x1be) /* padding_stream */ + goto skip; + + /* stream not present in PMT */ + if (!pes->st) { + pes->st = avformat_new_stream(ts->stream, NULL); + if (!pes->st) + return AVERROR(ENOMEM); + pes->st->id = pes->pid; + mpegts_set_stream_info(pes->st, pes, 0, 0); + } + + pes->total_size = AV_RB16(pes->header + 4); + /* NOTE: a zero total size means the PES size is + unbounded */ + if (!pes->total_size) + pes->total_size = MAX_PES_PAYLOAD; + + /* allocate pes buffer */ + pes->buffer = av_buffer_alloc(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 == AV_CODEC_ID_NONE && !pes->st->request_probe) { + av_dlog(pes->stream, "pid=%x stream_type=%x probing\n", + pes->pid, pes->stream_type); + pes->st->request_probe= 1; + } + } else { + pes->state = MPEGTS_PAYLOAD; + pes->data_index = 0; + } + } else { + /* otherwise, it should be a table */ + /* skip packet */ + skip: + pes->state = MPEGTS_SKIP; + continue; + } + } + break; + /**********************************************/ + /* PES packing parsing */ + case MPEGTS_PESHEADER: + len = PES_HEADER_SIZE - pes->data_index; + if (len < 0) + return -1; + if (len > buf_size) + len = buf_size; + memcpy(pes->header + pes->data_index, p, len); + pes->data_index += len; + p += len; + buf_size -= len; + if (pes->data_index == PES_HEADER_SIZE) { + pes->pes_header_size = pes->header[8] + 9; + pes->state = MPEGTS_PESHEADER_FILL; + } + break; + case MPEGTS_PESHEADER_FILL: + len = pes->pes_header_size - pes->data_index; + if (len < 0) + return -1; + if (len > buf_size) + len = buf_size; + memcpy(pes->header + pes->data_index, p, len); + pes->data_index += len; + p += len; + buf_size -= len; + if (pes->data_index == pes->pes_header_size) { + const uint8_t *r; + unsigned int flags, pes_ext, skip; + + flags = pes->header[7]; + r = pes->header + 9; + pes->pts = AV_NOPTS_VALUE; + pes->dts = AV_NOPTS_VALUE; + if ((flags & 0xc0) == 0x80) { + pes->dts = pes->pts = ff_parse_pes_pts(r); + r += 5; + } else if ((flags & 0xc0) == 0xc0) { + pes->pts = ff_parse_pes_pts(r); + r += 5; + pes->dts = ff_parse_pes_pts(r); + r += 5; + } + pes->extended_stream_id = -1; + if (flags & 0x01) { /* PES extension */ + pes_ext = *r++; + /* Skip PES private data, program packet sequence counter and P-STD buffer */ + skip = (pes_ext >> 4) & 0xb; + skip += skip & 0x9; + r += skip; + if ((pes_ext & 0x41) == 0x01 && + (r + 2) <= (pes->header + pes->pes_header_size)) { + /* PES extension 2 */ + if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0) + pes->extended_stream_id = r[1]; + } + } + + /* we got the full header. We parse it and get the payload */ + pes->state = MPEGTS_PAYLOAD; + pes->data_index = 0; + if (pes->stream_type == 0x12 && buf_size > 0) { + int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size); + pes->pes_header_size += sl_header_bytes; + p += sl_header_bytes; + buf_size -= sl_header_bytes; + } + } + break; + case MPEGTS_PAYLOAD: + if (buf_size > 0 && pes->buffer) { + if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) { + new_pes_packet(pes, ts->pkt); + pes->total_size = MAX_PES_PAYLOAD; + pes->buffer = av_buffer_alloc(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->data + pes->data_index, p, buf_size); + pes->data_index += buf_size; + } + buf_size = 0; + /* emit complete packets with known packet size + * decreases demuxer delay for infrequent packets like subtitles from + * a couple of seconds to milliseconds for properly muxed files. + * total_size is the number of bytes following pes_packet_length + * in the pes header, i.e. not counting the first PES_START_SIZE bytes */ + if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD && + pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) { + ts->stop_parse = 1; + new_pes_packet(pes, ts->pkt); + } + break; + case MPEGTS_SKIP: + buf_size = 0; + break; + } + } + + return 0; +} + +static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid) +{ + MpegTSFilter *tss; + PESContext *pes; + + /* if no pid found, then add a pid context */ + pes = av_mallocz(sizeof(PESContext)); + if (!pes) + return 0; + pes->ts = ts; + pes->stream = ts->stream; + pes->pid = pid; + pes->pcr_pid = pcr_pid; + pes->state = MPEGTS_SKIP; + pes->pts = AV_NOPTS_VALUE; + pes->dts = AV_NOPTS_VALUE; + tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes); + if (!tss) { + av_free(pes); + return 0; + } + return pes; +} + +#define MAX_LEVEL 4 +typedef struct { + AVFormatContext *s; + AVIOContext pb; + Mp4Descr *descr; + Mp4Descr *active_descr; + int descr_count; + int max_descr_count; + int level; +} MP4DescrParseContext; + +static int init_MP4DescrParseContext( + MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf, + unsigned size, Mp4Descr *descr, int max_descr_count) +{ + int ret; + if (size > (1<<30)) + return AVERROR_INVALIDDATA; + + if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0, + NULL, NULL, NULL, NULL)) < 0) + return ret; + + d->s = s; + d->level = 0; + d->descr_count = 0; + d->descr = descr; + d->active_descr = NULL; + d->max_descr_count = max_descr_count; + + return 0; +} + +static void update_offsets(AVIOContext *pb, int64_t *off, int *len) { + int64_t new_off = avio_tell(pb); + (*len) -= new_off - *off; + *off = new_off; +} + +static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, + int target_tag); + +static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len) +{ + while (len > 0) { + if (parse_mp4_descr(d, off, len, 0) < 0) + return -1; + update_offsets(&d->pb, &off, &len); + } + return 0; +} + +static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len) +{ + avio_rb16(&d->pb); // ID + avio_r8(&d->pb); + avio_r8(&d->pb); + avio_r8(&d->pb); + avio_r8(&d->pb); + avio_r8(&d->pb); + update_offsets(&d->pb, &off, &len); + return parse_mp4_descr_arr(d, off, len); +} + +static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len) +{ + int id_flags; + if (len < 2) + return 0; + id_flags = avio_rb16(&d->pb); + if (!(id_flags & 0x0020)) { //URL_Flag + update_offsets(&d->pb, &off, &len); + return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[] + } else { + return 0; + } +} + +static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len) +{ + int es_id = 0; + if (d->descr_count >= d->max_descr_count) + return -1; + ff_mp4_parse_es_descr(&d->pb, &es_id); + d->active_descr = d->descr + (d->descr_count++); + + d->active_descr->es_id = es_id; + update_offsets(&d->pb, &off, &len); + parse_mp4_descr(d, off, len, MP4DecConfigDescrTag); + update_offsets(&d->pb, &off, &len); + if (len > 0) + parse_mp4_descr(d, off, len, MP4SLDescrTag); + d->active_descr = NULL; + return 0; +} + +static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len) +{ + Mp4Descr *descr = d->active_descr; + if (!descr) + return -1; + d->active_descr->dec_config_descr = av_malloc(len); + if (!descr->dec_config_descr) + return AVERROR(ENOMEM); + descr->dec_config_descr_len = len; + avio_read(&d->pb, descr->dec_config_descr, len); + return 0; +} + +static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len) +{ + Mp4Descr *descr = d->active_descr; + int predefined; + if (!descr) + return -1; + + predefined = avio_r8(&d->pb); + if (!predefined) { + int lengths; + int flags = avio_r8(&d->pb); + descr->sl.use_au_start = !!(flags & 0x80); + descr->sl.use_au_end = !!(flags & 0x40); + descr->sl.use_rand_acc_pt = !!(flags & 0x20); + descr->sl.use_padding = !!(flags & 0x08); + descr->sl.use_timestamps = !!(flags & 0x04); + descr->sl.use_idle = !!(flags & 0x02); + descr->sl.timestamp_res = avio_rb32(&d->pb); + avio_rb32(&d->pb); + descr->sl.timestamp_len = avio_r8(&d->pb); + descr->sl.ocr_len = avio_r8(&d->pb); + descr->sl.au_len = avio_r8(&d->pb); + descr->sl.inst_bitrate_len = avio_r8(&d->pb); + lengths = avio_rb16(&d->pb); + descr->sl.degr_prior_len = lengths >> 12; + descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f; + descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f; + } else { + avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor"); + } + return 0; +} + +static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, + int target_tag) { + int tag; + int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag); + update_offsets(&d->pb, &off, &len); + if (len < 0 || len1 > len || len1 <= 0) { + av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len); + return -1; + } + + if (d->level++ >= MAX_LEVEL) { + av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n"); + goto done; + } + + if (target_tag && tag != target_tag) { + av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag); + goto done; + } + + switch (tag) { + case MP4IODescrTag: + parse_MP4IODescrTag(d, off, len1); + break; + case MP4ODescrTag: + parse_MP4ODescrTag(d, off, len1); + break; + case MP4ESDescrTag: + parse_MP4ESDescrTag(d, off, len1); + break; + case MP4DecConfigDescrTag: + parse_MP4DecConfigDescrTag(d, off, len1); + break; + case MP4SLDescrTag: + parse_MP4SLDescrTag(d, off, len1); + break; + } + +done: + d->level--; + avio_seek(&d->pb, off + len1, SEEK_SET); + return 0; +} + +static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size, + Mp4Descr *descr, int *descr_count, int max_descr_count) +{ + MP4DescrParseContext d; + if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0) + return -1; + + parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag); + + *descr_count = d.descr_count; + return 0; +} + +static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size, + Mp4Descr *descr, int *descr_count, int max_descr_count) +{ + MP4DescrParseContext d; + if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0) + return -1; + + parse_mp4_descr_arr(&d, avio_tell(&d.pb), size); + + *descr_count = d.descr_count; + return 0; +} + +static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = filter->u.section_filter.opaque; + SectionHeader h; + const uint8_t *p, *p_end; + AVIOContext pb; + Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }}; + int mp4_descr_count = 0; + int i, pid; + AVFormatContext *s = ts->stream; + + p_end = section + section_len - 4; + p = section; + if (parse_section_header(&h, &p, p_end) < 0) + return; + if (h.tid != M4OD_TID) + return; + + mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT); + + for (pid = 0; pid < NB_PID_MAX; pid++) { + if (!ts->pids[pid]) + continue; + for (i = 0; i < mp4_descr_count; i++) { + PESContext *pes; + AVStream *st; + if (ts->pids[pid]->es_id != mp4_descr[i].es_id) + continue; + if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) { + av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid); + continue; + } + pes = ts->pids[pid]->u.pes_filter.opaque; + st = pes->st; + if (!st) { + continue; + } + + pes->sl = mp4_descr[i].sl; + + ffio_init_context(&pb, mp4_descr[i].dec_config_descr, + mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL); + ff_mp4_read_dec_config_descr(s, st, &pb); + if (st->codec->codec_id == AV_CODEC_ID_AAC && + st->codec->extradata_size > 0) + st->need_parsing = 0; + if (st->codec->codec_id == AV_CODEC_ID_H264 && + st->codec->extradata_size > 0) + st->need_parsing = 0; + + if (st->codec->codec_id <= AV_CODEC_ID_NONE) { + } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) { + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) { + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) { + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + } + } + } + for (i = 0; i < mp4_descr_count; i++) + av_free(mp4_descr[i].dec_config_descr); +} + +int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type, + const uint8_t **pp, const uint8_t *desc_list_end, + Mp4Descr *mp4_descr, int mp4_descr_count, int pid, + MpegTSContext *ts) +{ + const uint8_t *desc_end; + int desc_len, desc_tag, desc_es_id; + char language[252]; + int i; + + desc_tag = get8(pp, desc_list_end); + if (desc_tag < 0) + return -1; + desc_len = get8(pp, desc_list_end); + if (desc_len < 0) + return -1; + desc_end = *pp + desc_len; + if (desc_end > desc_list_end) + return -1; + + av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len); + + if (st->codec->codec_id == AV_CODEC_ID_NONE && + stream_type == STREAM_TYPE_PRIVATE_DATA) + mpegts_find_stream_type(st, desc_tag, DESC_types); + + switch(desc_tag) { + case 0x1E: /* SL descriptor */ + desc_es_id = get16(pp, desc_end); + if (ts && ts->pids[pid]) + ts->pids[pid]->es_id = desc_es_id; + for (i = 0; i < mp4_descr_count; i++) + if (mp4_descr[i].dec_config_descr_len && + mp4_descr[i].es_id == desc_es_id) { + AVIOContext pb; + ffio_init_context(&pb, mp4_descr[i].dec_config_descr, + mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL); + ff_mp4_read_dec_config_descr(fc, st, &pb); + if (st->codec->codec_id == AV_CODEC_ID_AAC && + st->codec->extradata_size > 0) + st->need_parsing = 0; + if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS) + mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1); + } + break; + case 0x1F: /* FMC descriptor */ + get16(pp, desc_end); + if (mp4_descr_count > 0 && (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe>0) && + mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) { + AVIOContext pb; + ffio_init_context(&pb, mp4_descr->dec_config_descr, + mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL); + ff_mp4_read_dec_config_descr(fc, st, &pb); + if (st->codec->codec_id == AV_CODEC_ID_AAC && + st->codec->extradata_size > 0){ + st->request_probe= st->need_parsing = 0; + st->codec->codec_type= AVMEDIA_TYPE_AUDIO; + } + } + break; + case 0x56: /* DVB teletext descriptor */ + language[0] = get8(pp, desc_end); + language[1] = get8(pp, desc_end); + language[2] = get8(pp, desc_end); + language[3] = 0; + av_dict_set(&st->metadata, "language", language, 0); + break; + case 0x59: /* subtitling descriptor */ + language[0] = get8(pp, desc_end); + language[1] = get8(pp, desc_end); + language[2] = get8(pp, desc_end); + language[3] = 0; + /* hearing impaired subtitles detection */ + switch(get8(pp, desc_end)) { + case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */ + case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */ + case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */ + case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */ + case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */ + case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */ + st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; + break; + } + if (st->codec->extradata) { + if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4)) + avpriv_request_sample(fc, "DVB sub with multiple IDs"); + } 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 == AV_CODEC_ID_NONE) + mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types); + break; + case 0x52: /* stream identifier descriptor */ + st->stream_identifier = 1 + get8(pp, desc_end); + break; + default: + break; + } + *pp = desc_end; + return 0; +} + +static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = filter->u.section_filter.opaque; + SectionHeader h1, *h = &h1; + PESContext *pes; + AVStream *st; + const uint8_t *p, *p_end, *desc_list_end; + int program_info_length, pcr_pid, pid, stream_type; + int desc_list_len; + uint32_t prog_reg_desc = 0; /* registration descriptor */ + + Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }}; + int mp4_descr_count = 0; + int i; + + av_dlog(ts->stream, "PMT: len %i\n", section_len); + hex_dump_debug(ts->stream, 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); + if (pcr_pid < 0) + return; + pcr_pid &= 0x1fff; + 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); + if (program_info_length < 0) + return; + program_info_length &= 0xfff; + while(program_info_length >= 2) { + uint8_t tag, len; + tag = get8(&p, p_end); + len = get8(&p, p_end); + + av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len); + + if(len > program_info_length - 2) + //something else is broken, exit the program_descriptors_loop + break; + program_info_length -= len + 2; + if (tag == 0x1d) { // IOD descriptor + get8(&p, p_end); // scope + get8(&p, p_end); // label + len -= 2; + mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count, + &mp4_descr_count, MAX_MP4_DESCR_COUNT); + } else if (tag == 0x05 && len >= 4) { // registration descriptor + prog_reg_desc = bytestream_get_le32(&p); + len -= 4; + } + p += len; + } + p += program_info_length; + if (p >= p_end) + goto out; + + // stop parsing after pmt, we found header + if (!ts->stream->nb_streams) + ts->stop_parse = 2; + + for(;;) { + st = 0; + pes = NULL; + stream_type = get8(&p, p_end); + if (stream_type < 0) + break; + pid = get16(&p, p_end); + if (pid < 0) + break; + pid &= 0x1fff; + if (pid == ts->current_pid) + break; + + /* now create stream */ + if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) { + pes = ts->pids[pid]->u.pes_filter.opaque; + if (!pes->st) { + pes->st = avformat_new_stream(pes->stream, NULL); + if (!pes->st) + goto out; + pes->st->id = pes->pid; + } + st = pes->st; + } else if (stream_type != 0x13) { + if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably + pes = add_pes_stream(ts, pid, pcr_pid); + if (pes) { + st = avformat_new_stream(pes->stream, NULL); + if (!st) + goto out; + st->id = pes->pid; + } + } else { + int idx = ff_find_stream_index(ts->stream, pid); + if (idx >= 0) { + st = ts->stream->streams[idx]; + } else { + st = avformat_new_stream(ts->stream, NULL); + if (!st) + goto out; + st->id = pid; + st->codec->codec_type = AVMEDIA_TYPE_DATA; + } + } + + if (!st) + goto out; + + if (pes && !pes->stream_type) + mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc); + + add_pid_to_pmt(ts, h->id, pid); + + ff_program_add_stream_index(ts->stream, h->id, st->index); + + desc_list_len = get16(&p, p_end); + if (desc_list_len < 0) + break; + desc_list_len &= 0xfff; + desc_list_end = p + desc_list_len; + if (desc_list_end > p_end) + break; + for(;;) { + if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end, + mp4_descr, mp4_descr_count, pid, ts) < 0) + break; + + if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) { + ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index); + pes->sub_st->codec->codec_tag = st->codec->codec_tag; + } + } + p = desc_list_end; + } + + out: + for (i = 0; i < mp4_descr_count; i++) + av_free(mp4_descr[i].dec_config_descr); +} + +static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) +{ + MpegTSContext *ts = filter->u.section_filter.opaque; + SectionHeader h1, *h = &h1; + const uint8_t *p, *p_end; + int sid, pmt_pid; + AVProgram *program; + + av_dlog(ts->stream, "PAT:\n"); + hex_dump_debug(ts->stream, 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); + if (pmt_pid < 0) + break; + pmt_pid &= 0x1fff; + + if (pmt_pid == ts->current_pid) + 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); + } + } + + if (sid < 0) { + int i,j; + for (j=0; j<ts->stream->nb_programs; j++) { + for (i=0; i<ts->nb_prg; i++) + if (ts->prg[i].id == ts->stream->programs[j]->id) + break; + if (i==ts->nb_prg) + clear_avprogram(ts, ts->stream->programs[j]->id); + } + } +} + +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, 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); + if (desc_list_len < 0) + break; + desc_list_len &= 0xfff; + 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; + ts->current_pid = pid; + + afc = (packet[3] >> 4) & 3; + if (afc == 0) /* reserved value */ + return 0; + has_adaptation = afc & 2; + has_payload = afc & 1; + is_discontinuity = has_adaptation + && packet[4] != 0 /* with length > 0 */ + && (packet[5] & 0x80); /* and discontinuity indicated */ + + /* continuity check (currently not used) */ + cc = (packet[3] & 0xf); + expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc; + cc_ok = pid == 0x1FFF // null packet PID + || is_discontinuity + || tss->last_cc < 0 + || expected_cc == cc; + + tss->last_cc = cc; + if (!cc_ok) { + av_log(ts->stream, AV_LOG_DEBUG, + "Continuity check failed for pid %d expected %d got %d\n", + pid, expected_cc, cc); + if(tss->type == MPEGTS_PES) { + PESContext *pc = tss->u.pes_filter.opaque; + pc->flags |= AV_PKT_FLAG_CORRUPT; + } + } + + if (!has_payload) + return 0; + p = packet + 4; + if (has_adaptation) { + /* skip adaptation field */ + p += p[0] + 1; + } + /* if past the end of packet, ignore */ + p_end = packet + TS_PACKET_SIZE; + if (p >= p_end) + return 0; + + pos = avio_tell(ts->stream->pb); + ts->pos47= pos % ts->raw_packet_size; + + if (tss->type == MPEGTS_SECTION) { + if (is_start) { + /* pointer field present */ + len = *p++; + if (p + len > p_end) + return 0; + if (len && cc_ok) { + /* write remaining section bytes */ + write_section_data(s, tss, + p, len, 0); + /* check whether filter has been closed */ + if (!ts->pids[pid]) + return 0; + } + p += len; + if (p < p_end) { + write_section_data(s, tss, + p, p_end - p, 1); + } + } else { + if (cc_ok) { + write_section_data(s, tss, + p, p_end - p, 0); + } + } + } else { + int ret; + // Note: The position here points actually behind the current packet. + if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start, + pos - ts->raw_packet_size)) < 0) + return ret; + } + + return 0; +} + +/* XXX: try to find a better synchro over several packets (use + get_packet_size() ?) */ +static int mpegts_resync(AVFormatContext *s) +{ + AVIOContext *pb = s->pb; + int c, i; + + for(i = 0;i < MAX_RESYNC_SIZE; i++) { + c = avio_r8(pb); + if (url_feof(pb)) + return -1; + if (c == 0x47) { + avio_seek(pb, -1, SEEK_CUR); + return 0; + } + } + av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n"); + /* no sync found */ + return -1; +} + +/* return -1 if error or EOF. Return 0 if OK. */ +static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size) +{ + AVIOContext *pb = s->pb; + int skip, len; + + for(;;) { + len = avio_read(pb, buf, TS_PACKET_SIZE); + if (len != TS_PACKET_SIZE) + return len < 0 ? len : AVERROR_EOF; + /* check packet sync byte */ + if (buf[0] != 0x47) { + /* find a new packet start */ + avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR); + if (mpegts_resync(s) < 0) + return AVERROR(EAGAIN); + else + continue; + } else { + skip = raw_packet_size - TS_PACKET_SIZE; + if (skip > 0) + avio_skip(pb, skip); + break; + } + } + return 0; +} + +static int handle_packets(MpegTSContext *ts, int nb_packets) +{ + AVFormatContext *s = ts->stream; + uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; + int packet_num, ret = 0; + + if (avio_tell(s->pb) != ts->last_pos) { + int i; + av_dlog(ts->stream, "Skipping after seek\n"); + /* seek detected, flush pes buffer */ + for (i = 0; i < NB_PID_MAX; i++) { + if (ts->pids[i]) { + if (ts->pids[i]->type == MPEGTS_PES) { + PESContext *pes = ts->pids[i]->u.pes_filter.opaque; + av_buffer_unref(&pes->buffer); + pes->data_index = 0; + pes->state = MPEGTS_SKIP; /* skip until pes header */ + } + ts->pids[i]->last_cc = -1; + } + } + } + + ts->stop_parse = 0; + packet_num = 0; + memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE); + for(;;) { + packet_num++; + if (nb_packets != 0 && packet_num >= nb_packets || + ts->stop_parse > 1) { + ret = AVERROR(EAGAIN); + break; + } + if (ts->stop_parse > 0) + break; + + ret = read_packet(s, packet, ts->raw_packet_size); + if (ret != 0) + break; + ret = handle_packet(ts, packet); + if (ret != 0) + break; + } + ts->last_pos = avio_tell(s->pb); + return ret; +} + +static int mpegts_probe(AVProbeData *p) +{ + const int size= p->buf_size; + int maxscore=0; + int sumscore=0; + int i; + int check_count= size / TS_FEC_PACKET_SIZE; +#define CHECK_COUNT 10 +#define CHECK_BLOCK 100 + + if (check_count < CHECK_COUNT) + return -1; + + for (i=0; i<check_count; i+=CHECK_BLOCK){ + int left = FFMIN(check_count - i, CHECK_BLOCK); + int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL); + int dvhs_score= analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL); + int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL); + score = FFMAX3(score, dvhs_score, fec_score); + sumscore += score; + maxscore = FFMAX(maxscore, score); + } + + sumscore = sumscore*CHECK_COUNT/check_count; + maxscore = maxscore*CHECK_COUNT/CHECK_BLOCK; + + av_dlog(0, "TS score: %d %d\n", sumscore, maxscore); + + if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT; + else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT; + else return -1; +} + +/* 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) +{ + MpegTSContext *ts = s->priv_data; + AVIOContext *pb = s->pb; + uint8_t buf[8*1024]={0}; + int len; + int64_t pos; + + /* read the first 8192 bytes to get packet size */ + pos = avio_tell(pb); + len = avio_read(pb, buf, sizeof(buf)); + ts->raw_packet_size = get_packet_size(buf, len); + if (ts->raw_packet_size <= 0) { + av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n"); + ts->raw_packet_size = TS_PACKET_SIZE; + } + ts->stream = s; + ts->auto_guess = 0; + + if (s->iformat == &ff_mpegts_demuxer) { + /* normal demux */ + + /* first do a scan to get all the services */ + /* NOTE: We attempt to seek on non-seekable files as well, as the + * probe buffer usually is big enough. Only warn if the seek failed + * on files where the seek should work. */ + if (avio_seek(pb, pos, SEEK_SET) < 0) + av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n"); + + mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1); + + mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1); + + handle_packets(ts, s->probesize / ts->raw_packet_size); + /* if could not find service, enable auto_guess */ + + ts->auto_guess = 1; + + av_dlog(ts->stream, "tuning done\n"); + + s->ctx_flags |= AVFMTCTX_NOHEADER; + } else { + AVStream *st; + int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l; + int64_t pcrs[2], pcr_h; + int packet_count[2]; + uint8_t packet[TS_PACKET_SIZE]; + + /* only read packets */ + + st = avformat_new_stream(s, NULL); + if (!st) + goto fail; + avpriv_set_pts_info(st, 60, 1, 27000000); + st->codec->codec_type = AVMEDIA_TYPE_DATA; + st->codec->codec_id = AV_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; + + pkt->size = -1; + ts->pkt = pkt; + ret = handle_packets(ts, 0); + if (ret < 0) { + av_free_packet(ts->pkt); + /* 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; + } + } + } + } + + if (!ret && pkt->size < 0) + ret = AVERROR(EINTR); + return ret; +} + +static void mpegts_free(MpegTSContext *ts) +{ + int i; + + clear_programs(ts); + + for(i=0;i<NB_PID_MAX;i++) + if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]); +} + +static int mpegts_read_close(AVFormatContext *s) +{ + MpegTSContext *ts = s->priv_data; + mpegts_free(ts); + return 0; +} + +static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, + int64_t *ppos, int64_t pos_limit) +{ + MpegTSContext *ts = s->priv_data; + int64_t pos, timestamp; + uint8_t buf[TS_PACKET_SIZE]; + int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid; + pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47; + while(pos < pos_limit) { + if (avio_seek(s->pb, pos, SEEK_SET) < 0) + return AV_NOPTS_VALUE; + if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE) + return AV_NOPTS_VALUE; + if (buf[0] != 0x47) { + if (mpegts_resync(s) < 0) + return AV_NOPTS_VALUE; + pos = avio_tell(s->pb); + continue; + } + if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) && + parse_pcr(×tamp, &pcr_l, buf) == 0) { + *ppos = pos; + return timestamp; + } + pos += ts->raw_packet_size; + } + + return AV_NOPTS_VALUE; +} + +static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index, + int64_t *ppos, int64_t pos_limit) +{ + MpegTSContext *ts = s->priv_data; + int64_t pos; + pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47; + ff_read_frame_flush(s); + if (avio_seek(s->pb, pos, SEEK_SET) < 0) + return AV_NOPTS_VALUE; + while(pos < pos_limit) { + int ret; + AVPacket pkt; + av_init_packet(&pkt); + ret= av_read_frame(s, &pkt); + if(ret < 0) + return AV_NOPTS_VALUE; + av_free_packet(&pkt); + if(pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0){ + ff_reduce_index(s, pkt.stream_index); + av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */); + if(pkt.stream_index == stream_index){ + *ppos= pkt.pos; + return pkt.dts; + } + } + pos = pkt.pos; + } + + return AV_NOPTS_VALUE; +} + +/**************************************************************/ +/* parsing functions - called from other demuxers such as RTP */ + +MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s) +{ + MpegTSContext *ts; + + ts = av_mallocz(sizeof(MpegTSContext)); + if (!ts) + return NULL; + /* no stream case, currently used by RTP */ + ts->raw_packet_size = TS_PACKET_SIZE; + ts->stream = s; + ts->auto_guess = 1; + mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1); + mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1); + + return ts; +} + +/* return the consumed length if a packet was output, or -1 if no + packet is output */ +int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, + const uint8_t *buf, int len) +{ + int len1; + + len1 = len; + ts->pkt = pkt; + for(;;) { + ts->stop_parse = 0; + if (len < TS_PACKET_SIZE) + return -1; + if (buf[0] != 0x47) { + buf++; + len--; + } else { + handle_packet(ts, buf); + buf += TS_PACKET_SIZE; + len -= TS_PACKET_SIZE; + if (ts->stop_parse == 1) + break; + } + } + return len1 - len; +} + +void ff_mpegts_parse_close(MpegTSContext *ts) +{ + mpegts_free(ts); + av_free(ts); +} + +AVInputFormat ff_mpegts_demuxer = { + .name = "mpegts", + .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"), + .priv_data_size = sizeof(MpegTSContext), + .read_probe = mpegts_probe, + .read_header = mpegts_read_header, + .read_packet = mpegts_read_packet, + .read_close = mpegts_read_close, + .read_timestamp = mpegts_get_dts, + .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, +}; + +AVInputFormat ff_mpegtsraw_demuxer = { + .name = "mpegtsraw", + .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"), + .priv_data_size = sizeof(MpegTSContext), + .read_header = mpegts_read_header, + .read_packet = mpegts_raw_read_packet, + .read_close = mpegts_read_close, + .read_timestamp = mpegts_get_dts, + .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, + .priv_class = &mpegtsraw_class, +}; |