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1547 lines
44 KiB
1547 lines
44 KiB
/* |
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* MPEG2 transport stream (aka DVB) demuxer |
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* Copyright (c) 2002-2003 Fabrice Bellard. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "crc.h" |
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#include "mpegts.h" |
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|
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//#define DEBUG_SI |
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//#define DEBUG_SEEK |
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|
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/* 1.0 second at 24Mbit/s */ |
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#define MAX_SCAN_PACKETS 32000 |
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|
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/* maximum size in which we look for synchronisation if |
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synchronisation is lost */ |
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#define MAX_RESYNC_SIZE 4096 |
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|
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typedef struct PESContext PESContext; |
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|
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static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type); |
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static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code); |
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|
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enum MpegTSFilterType { |
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MPEGTS_PES, |
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MPEGTS_SECTION, |
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}; |
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|
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typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start); |
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|
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typedef struct MpegTSPESFilter { |
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PESCallback *pes_cb; |
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void *opaque; |
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} MpegTSPESFilter; |
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|
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typedef void SectionCallback(void *opaque, const uint8_t *buf, int len); |
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|
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typedef void SetServiceCallback(void *opaque, int ret); |
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|
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typedef struct MpegTSSectionFilter { |
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int section_index; |
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int section_h_size; |
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uint8_t *section_buf; |
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int check_crc:1; |
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int end_of_section_reached:1; |
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SectionCallback *section_cb; |
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void *opaque; |
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} MpegTSSectionFilter; |
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|
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typedef struct MpegTSFilter { |
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int pid; |
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int last_cc; /* last cc code (-1 if first packet) */ |
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enum MpegTSFilterType type; |
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union { |
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MpegTSPESFilter pes_filter; |
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MpegTSSectionFilter section_filter; |
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} u; |
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} MpegTSFilter; |
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|
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typedef struct MpegTSService { |
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int running:1; |
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int sid; /**< MPEG Program Number of stream */ |
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char *provider_name; /**< DVB Network name, "" if not DVB stream */ |
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char *name; /**< DVB Service name, "MPEG Program [sid]" if not DVB stream*/ |
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} MpegTSService; |
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|
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struct MpegTSContext { |
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/* user data */ |
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AVFormatContext *stream; |
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/** raw packet size, including FEC if present */ |
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int raw_packet_size; |
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/** if true, all pids are analyzed to find streams */ |
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int auto_guess; |
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int set_service_ret; |
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|
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/** force raw MPEG2 transport stream output, if possible */ |
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int mpeg2ts_raw; |
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/** compute exact PCR for each transport stream packet */ |
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int mpeg2ts_compute_pcr; |
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|
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int64_t cur_pcr; /**< used to estimate the exact PCR */ |
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int pcr_incr; /**< used to estimate the exact PCR */ |
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int pcr_pid; /**< used to estimate the exact PCR */ |
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|
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/* data needed to handle file based ts */ |
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/** stop parsing loop */ |
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int stop_parse; |
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/** packet containing Audio/Video data */ |
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AVPacket *pkt; |
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|
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/******************************************/ |
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/* private mpegts data */ |
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/* scan context */ |
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MpegTSFilter *sdt_filter; |
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/** number of PMTs in the last PAT seen */ |
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int nb_services; |
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/** list of PMTs in the last PAT seen */ |
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MpegTSService **services; |
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|
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/* set service context (XXX: allocated it ?) */ |
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SetServiceCallback *set_service_cb; |
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void *set_service_opaque; |
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/** filter for the PAT */ |
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MpegTSFilter *pat_filter; |
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/** filter for the PMT for the MPEG program number specified by req_sid */ |
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MpegTSFilter *pmt_filter; |
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/** MPEG program number of stream we want to decode */ |
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int req_sid; |
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|
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/** filters for various streams specified by PMT + for the PAT and PMT */ |
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MpegTSFilter *pids[NB_PID_MAX]; |
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}; |
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|
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/** |
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* Assembles PES packets out of TS packets, and then calls the "section_cb" |
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* function when they are complete. |
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*/ |
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static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1, |
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const uint8_t *buf, int buf_size, int is_start) |
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{ |
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MpegTSSectionFilter *tss = &tss1->u.section_filter; |
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int len; |
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|
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if (is_start) { |
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memcpy(tss->section_buf, buf, buf_size); |
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tss->section_index = buf_size; |
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tss->section_h_size = -1; |
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tss->end_of_section_reached = 0; |
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} else { |
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if (tss->end_of_section_reached) |
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return; |
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len = 4096 - tss->section_index; |
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if (buf_size < len) |
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len = buf_size; |
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memcpy(tss->section_buf + tss->section_index, buf, len); |
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tss->section_index += len; |
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} |
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|
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/* compute section length if possible */ |
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if (tss->section_h_size == -1 && tss->section_index >= 3) { |
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len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3; |
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if (len > 4096) |
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return; |
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tss->section_h_size = len; |
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} |
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|
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if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) { |
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tss->end_of_section_reached = 1; |
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if (!tss->check_crc || |
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av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0) |
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tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size); |
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} |
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} |
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static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid, |
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SectionCallback *section_cb, void *opaque, |
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int check_crc) |
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|
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{ |
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MpegTSFilter *filter; |
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MpegTSSectionFilter *sec; |
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|
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#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "Filter: pid=0x%x\n", pid); |
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#endif |
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if (pid >= NB_PID_MAX || ts->pids[pid]) |
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return NULL; |
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filter = av_mallocz(sizeof(MpegTSFilter)); |
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if (!filter) |
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return NULL; |
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ts->pids[pid] = filter; |
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filter->type = MPEGTS_SECTION; |
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filter->pid = pid; |
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filter->last_cc = -1; |
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sec = &filter->u.section_filter; |
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sec->section_cb = section_cb; |
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sec->opaque = opaque; |
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sec->section_buf = av_malloc(MAX_SECTION_SIZE); |
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sec->check_crc = check_crc; |
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if (!sec->section_buf) { |
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av_free(filter); |
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return NULL; |
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} |
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return filter; |
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} |
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|
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static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, |
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PESCallback *pes_cb, |
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void *opaque) |
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{ |
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MpegTSFilter *filter; |
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MpegTSPESFilter *pes; |
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|
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if (pid >= NB_PID_MAX || ts->pids[pid]) |
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return NULL; |
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filter = av_mallocz(sizeof(MpegTSFilter)); |
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if (!filter) |
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return NULL; |
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ts->pids[pid] = filter; |
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filter->type = MPEGTS_PES; |
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filter->pid = pid; |
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filter->last_cc = -1; |
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pes = &filter->u.pes_filter; |
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pes->pes_cb = pes_cb; |
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pes->opaque = opaque; |
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return filter; |
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} |
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|
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static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter) |
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{ |
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int pid; |
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|
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pid = filter->pid; |
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if (filter->type == MPEGTS_SECTION) |
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av_freep(&filter->u.section_filter.section_buf); |
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else if (filter->type == MPEGTS_PES) |
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av_freep(&filter->u.pes_filter.opaque); |
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|
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av_free(filter); |
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ts->pids[pid] = NULL; |
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} |
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static int analyze(const uint8_t *buf, int size, int packet_size, int *index){ |
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int stat[packet_size]; |
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int i; |
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int x=0; |
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int best_score=0; |
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|
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memset(stat, 0, packet_size*sizeof(int)); |
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|
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for(x=i=0; i<size; i++){ |
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if(buf[i] == 0x47){ |
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stat[x]++; |
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if(stat[x] > best_score){ |
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best_score= stat[x]; |
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if(index) *index= x; |
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} |
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} |
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x++; |
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if(x == packet_size) x= 0; |
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} |
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return best_score; |
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} |
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/* autodetect fec presence. Must have at least 1024 bytes */ |
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static int get_packet_size(const uint8_t *buf, int size) |
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{ |
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int score, fec_score, dvhs_score; |
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|
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if (size < (TS_FEC_PACKET_SIZE * 5 + 1)) |
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return -1; |
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score = analyze(buf, size, TS_PACKET_SIZE, NULL); |
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dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL); |
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fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL); |
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// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score); |
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if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE; |
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else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE; |
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else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE; |
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else return -1; |
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} |
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|
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typedef struct SectionHeader { |
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uint8_t tid; |
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uint16_t id; |
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uint8_t version; |
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uint8_t sec_num; |
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uint8_t last_sec_num; |
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} SectionHeader; |
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|
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static inline int get8(const uint8_t **pp, const uint8_t *p_end) |
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{ |
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const uint8_t *p; |
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int c; |
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|
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p = *pp; |
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if (p >= p_end) |
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return -1; |
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c = *p++; |
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*pp = p; |
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return c; |
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} |
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static inline int get16(const uint8_t **pp, const uint8_t *p_end) |
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{ |
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const uint8_t *p; |
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int c; |
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|
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p = *pp; |
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if ((p + 1) >= p_end) |
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return -1; |
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c = (p[0] << 8) | p[1]; |
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p += 2; |
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*pp = p; |
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return c; |
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} |
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|
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/* read and allocate a DVB string preceeded by its length */ |
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static char *getstr8(const uint8_t **pp, const uint8_t *p_end) |
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{ |
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int len; |
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const uint8_t *p; |
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char *str; |
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|
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p = *pp; |
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len = get8(&p, p_end); |
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if (len < 0) |
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return NULL; |
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if ((p + len) > p_end) |
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return NULL; |
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str = av_malloc(len + 1); |
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if (!str) |
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return NULL; |
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memcpy(str, p, len); |
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str[len] = '\0'; |
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p += len; |
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*pp = p; |
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return str; |
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} |
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static int parse_section_header(SectionHeader *h, |
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const uint8_t **pp, const uint8_t *p_end) |
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{ |
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int val; |
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|
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val = get8(pp, p_end); |
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if (val < 0) |
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return -1; |
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h->tid = val; |
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*pp += 2; |
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val = get16(pp, p_end); |
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if (val < 0) |
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return -1; |
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h->id = val; |
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val = get8(pp, p_end); |
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if (val < 0) |
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return -1; |
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h->version = (val >> 1) & 0x1f; |
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val = get8(pp, p_end); |
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if (val < 0) |
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return -1; |
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h->sec_num = val; |
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val = get8(pp, p_end); |
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if (val < 0) |
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return -1; |
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h->last_sec_num = val; |
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return 0; |
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} |
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|
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static MpegTSService *new_service(MpegTSContext *ts, int sid, |
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char *provider_name, char *name) |
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{ |
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MpegTSService *service; |
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|
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#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "new_service: " |
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"sid=0x%04x provider='%s' name='%s'\n", |
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sid, provider_name, name); |
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#endif |
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|
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service = av_mallocz(sizeof(MpegTSService)); |
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if (!service) |
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return NULL; |
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service->sid = sid; |
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service->provider_name = provider_name; |
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service->name = name; |
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dynarray_add(&ts->services, &ts->nb_services, service); |
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return service; |
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} |
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|
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static void pmt_cb(void *opaque, const uint8_t *section, int section_len) |
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{ |
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MpegTSContext *ts = opaque; |
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SectionHeader h1, *h = &h1; |
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PESContext *pes; |
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AVStream *st; |
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const uint8_t *p, *p_end, *desc_list_end, *desc_end; |
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int program_info_length, pcr_pid, pid, stream_type; |
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int desc_list_len, desc_len, desc_tag; |
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int comp_page = 0, anc_page = 0; /* initialize to kill warnings */ |
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char language[4]; |
|
|
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#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "PMT: len %i\n", section_len); |
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av_hex_dump(stdout, (uint8_t *)section, section_len); |
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#endif |
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p_end = section + section_len - 4; |
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p = section; |
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if (parse_section_header(h, &p, p_end) < 0) |
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return; |
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#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "sid=0x%x sec_num=%d/%d\n", |
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h->id, h->sec_num, h->last_sec_num); |
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#endif |
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if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) ) |
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return; |
|
|
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pcr_pid = get16(&p, p_end) & 0x1fff; |
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if (pcr_pid < 0) |
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return; |
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ts->pcr_pid = pcr_pid; |
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#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "pcr_pid=0x%x\n", pcr_pid); |
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#endif |
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program_info_length = get16(&p, p_end) & 0xfff; |
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if (program_info_length < 0) |
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return; |
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p += program_info_length; |
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if (p >= p_end) |
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return; |
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for(;;) { |
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language[0] = 0; |
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st = 0; |
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stream_type = get8(&p, p_end); |
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if (stream_type < 0) |
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break; |
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pid = get16(&p, p_end) & 0x1fff; |
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if (pid < 0) |
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break; |
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desc_list_len = get16(&p, p_end) & 0xfff; |
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if (desc_list_len < 0) |
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break; |
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desc_list_end = p + desc_list_len; |
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if (desc_list_end > p_end) |
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break; |
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for(;;) { |
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desc_tag = get8(&p, desc_list_end); |
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if (desc_tag < 0) |
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break; |
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if (stream_type == STREAM_TYPE_PRIVATE_DATA) { |
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if((desc_tag == 0x6A) || (desc_tag == 0x7A)) { |
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/*assume DVB AC-3 Audio*/ |
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stream_type = STREAM_TYPE_AUDIO_AC3; |
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} else if(desc_tag == 0x7B) { |
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/* DVB DTS audio */ |
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stream_type = STREAM_TYPE_AUDIO_DTS; |
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} |
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} |
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desc_len = get8(&p, desc_list_end); |
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desc_end = p + desc_len; |
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if (desc_end > desc_list_end) |
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break; |
|
#ifdef DEBUG_SI |
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av_log(NULL, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n", |
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desc_tag, desc_len); |
|
#endif |
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switch(desc_tag) { |
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case DVB_SUBT_DESCID: |
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if (stream_type == STREAM_TYPE_PRIVATE_DATA) |
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stream_type = STREAM_TYPE_SUBTITLE_DVB; |
|
|
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language[0] = get8(&p, desc_end); |
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language[1] = get8(&p, desc_end); |
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language[2] = get8(&p, desc_end); |
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language[3] = 0; |
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get8(&p, desc_end); |
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comp_page = get16(&p, desc_end); |
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anc_page = get16(&p, desc_end); |
|
|
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break; |
|
case 0x0a: /* ISO 639 language descriptor */ |
|
language[0] = get8(&p, desc_end); |
|
language[1] = get8(&p, desc_end); |
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language[2] = get8(&p, desc_end); |
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language[3] = 0; |
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break; |
|
default: |
|
break; |
|
} |
|
p = desc_end; |
|
} |
|
p = desc_list_end; |
|
|
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "stream_type=%d pid=0x%x\n", |
|
stream_type, pid); |
|
#endif |
|
|
|
/* now create ffmpeg stream */ |
|
switch(stream_type) { |
|
case STREAM_TYPE_AUDIO_MPEG1: |
|
case STREAM_TYPE_AUDIO_MPEG2: |
|
case STREAM_TYPE_VIDEO_MPEG1: |
|
case STREAM_TYPE_VIDEO_MPEG2: |
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case STREAM_TYPE_VIDEO_MPEG4: |
|
case STREAM_TYPE_VIDEO_H264: |
|
case STREAM_TYPE_AUDIO_AAC: |
|
case STREAM_TYPE_AUDIO_AC3: |
|
case STREAM_TYPE_AUDIO_DTS: |
|
case STREAM_TYPE_SUBTITLE_DVB: |
|
pes = add_pes_stream(ts, pid, stream_type); |
|
if (pes) |
|
st = new_pes_av_stream(pes, 0); |
|
break; |
|
default: |
|
/* we ignore the other streams */ |
|
break; |
|
} |
|
|
|
if (st) { |
|
if (language[0] != 0) { |
|
st->language[0] = language[0]; |
|
st->language[1] = language[1]; |
|
st->language[2] = language[2]; |
|
st->language[3] = language[3]; |
|
} |
|
|
|
if (stream_type == STREAM_TYPE_SUBTITLE_DVB) { |
|
st->codec->sub_id = (anc_page << 16) | comp_page; |
|
} |
|
} |
|
} |
|
/* all parameters are there */ |
|
ts->set_service_cb(ts->set_service_opaque, 0); |
|
mpegts_close_filter(ts, ts->pmt_filter); |
|
ts->pmt_filter = NULL; |
|
} |
|
|
|
static void pat_cb(void *opaque, const uint8_t *section, int section_len) |
|
{ |
|
MpegTSContext *ts = opaque; |
|
SectionHeader h1, *h = &h1; |
|
const uint8_t *p, *p_end; |
|
int sid, pmt_pid; |
|
|
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "PAT:\n"); |
|
av_hex_dump(stdout, (uint8_t *)section, section_len); |
|
#endif |
|
p_end = section + section_len - 4; |
|
p = section; |
|
if (parse_section_header(h, &p, p_end) < 0) |
|
return; |
|
if (h->tid != PAT_TID) |
|
return; |
|
|
|
for(;;) { |
|
sid = get16(&p, p_end); |
|
if (sid < 0) |
|
break; |
|
pmt_pid = get16(&p, p_end) & 0x1fff; |
|
if (pmt_pid < 0) |
|
break; |
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid); |
|
#endif |
|
if (sid == 0x0000) { |
|
/* NIT info */ |
|
} else { |
|
if (ts->req_sid == sid) { |
|
ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid, |
|
pmt_cb, ts, 1); |
|
goto found; |
|
} |
|
} |
|
} |
|
/* not found */ |
|
ts->set_service_cb(ts->set_service_opaque, -1); |
|
|
|
found: |
|
mpegts_close_filter(ts, ts->pat_filter); |
|
ts->pat_filter = NULL; |
|
} |
|
|
|
/* add all services found in the PAT */ |
|
static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len) |
|
{ |
|
MpegTSContext *ts = opaque; |
|
SectionHeader h1, *h = &h1; |
|
const uint8_t *p, *p_end; |
|
int sid, pmt_pid; |
|
char *provider_name, *name; |
|
char buf[256]; |
|
|
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "PAT:\n"); |
|
av_hex_dump(stdout, (uint8_t *)section, section_len); |
|
#endif |
|
p_end = section + section_len - 4; |
|
p = section; |
|
if (parse_section_header(h, &p, p_end) < 0) |
|
return; |
|
if (h->tid != PAT_TID) |
|
return; |
|
|
|
for(;;) { |
|
sid = get16(&p, p_end); |
|
if (sid < 0) |
|
break; |
|
pmt_pid = get16(&p, p_end) & 0x1fff; |
|
if (pmt_pid < 0) |
|
break; |
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "sid=0x%x pid=0x%x\n", sid, pmt_pid); |
|
#endif |
|
if (sid == 0x0000) { |
|
/* NIT info */ |
|
} else { |
|
/* add the service with a dummy name */ |
|
snprintf(buf, sizeof(buf), "Service %x\n", sid); |
|
name = av_strdup(buf); |
|
provider_name = av_strdup(""); |
|
if (name && provider_name) { |
|
new_service(ts, sid, provider_name, name); |
|
} else { |
|
av_freep(&name); |
|
av_freep(&provider_name); |
|
} |
|
} |
|
} |
|
ts->stop_parse = 1; |
|
|
|
/* remove filter */ |
|
mpegts_close_filter(ts, ts->pat_filter); |
|
ts->pat_filter = NULL; |
|
} |
|
|
|
static void mpegts_set_service(MpegTSContext *ts, int sid, |
|
SetServiceCallback *set_service_cb, void *opaque) |
|
{ |
|
ts->set_service_cb = set_service_cb; |
|
ts->set_service_opaque = opaque; |
|
ts->req_sid = sid; |
|
ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID, |
|
pat_cb, ts, 1); |
|
} |
|
|
|
static void sdt_cb(void *opaque, const uint8_t *section, int section_len) |
|
{ |
|
MpegTSContext *ts = opaque; |
|
SectionHeader h1, *h = &h1; |
|
const uint8_t *p, *p_end, *desc_list_end, *desc_end; |
|
int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type; |
|
char *name, *provider_name; |
|
|
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "SDT:\n"); |
|
av_hex_dump(stdout, (uint8_t *)section, section_len); |
|
#endif |
|
|
|
p_end = section + section_len - 4; |
|
p = section; |
|
if (parse_section_header(h, &p, p_end) < 0) |
|
return; |
|
if (h->tid != SDT_TID) |
|
return; |
|
onid = get16(&p, p_end); |
|
if (onid < 0) |
|
return; |
|
val = get8(&p, p_end); |
|
if (val < 0) |
|
return; |
|
for(;;) { |
|
sid = get16(&p, p_end); |
|
if (sid < 0) |
|
break; |
|
val = get8(&p, p_end); |
|
if (val < 0) |
|
break; |
|
desc_list_len = get16(&p, p_end) & 0xfff; |
|
if (desc_list_len < 0) |
|
break; |
|
desc_list_end = p + desc_list_len; |
|
if (desc_list_end > p_end) |
|
break; |
|
for(;;) { |
|
desc_tag = get8(&p, desc_list_end); |
|
if (desc_tag < 0) |
|
break; |
|
desc_len = get8(&p, desc_list_end); |
|
desc_end = p + desc_len; |
|
if (desc_end > desc_list_end) |
|
break; |
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "tag: 0x%02x len=%d\n", |
|
desc_tag, desc_len); |
|
#endif |
|
switch(desc_tag) { |
|
case 0x48: |
|
service_type = get8(&p, p_end); |
|
if (service_type < 0) |
|
break; |
|
provider_name = getstr8(&p, p_end); |
|
if (!provider_name) |
|
break; |
|
name = getstr8(&p, p_end); |
|
if (!name) |
|
break; |
|
new_service(ts, sid, provider_name, name); |
|
break; |
|
default: |
|
break; |
|
} |
|
p = desc_end; |
|
} |
|
p = desc_list_end; |
|
} |
|
ts->stop_parse = 1; |
|
|
|
/* remove filter */ |
|
mpegts_close_filter(ts, ts->sdt_filter); |
|
ts->sdt_filter = NULL; |
|
} |
|
|
|
/* scan services in a transport stream by looking at the SDT */ |
|
static void mpegts_scan_sdt(MpegTSContext *ts) |
|
{ |
|
ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID, |
|
sdt_cb, ts, 1); |
|
} |
|
|
|
/* scan services in a transport stream by looking at the PAT (better |
|
than nothing !) */ |
|
static void mpegts_scan_pat(MpegTSContext *ts) |
|
{ |
|
ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID, |
|
pat_scan_cb, ts, 1); |
|
} |
|
|
|
/* TS stream handling */ |
|
|
|
enum MpegTSState { |
|
MPEGTS_HEADER = 0, |
|
MPEGTS_PESHEADER_FILL, |
|
MPEGTS_PAYLOAD, |
|
MPEGTS_SKIP, |
|
}; |
|
|
|
/* enough for PES header + length */ |
|
#define PES_START_SIZE 9 |
|
#define MAX_PES_HEADER_SIZE (9 + 255) |
|
|
|
struct PESContext { |
|
int pid; |
|
int stream_type; |
|
MpegTSContext *ts; |
|
AVFormatContext *stream; |
|
AVStream *st; |
|
enum MpegTSState state; |
|
/* used to get the format */ |
|
int data_index; |
|
int total_size; |
|
int pes_header_size; |
|
int64_t pts, dts; |
|
uint8_t header[MAX_PES_HEADER_SIZE]; |
|
}; |
|
|
|
static int64_t get_pts(const uint8_t *p) |
|
{ |
|
int64_t pts; |
|
int val; |
|
|
|
pts = (int64_t)((p[0] >> 1) & 0x07) << 30; |
|
val = (p[1] << 8) | p[2]; |
|
pts |= (int64_t)(val >> 1) << 15; |
|
val = (p[3] << 8) | p[4]; |
|
pts |= (int64_t)(val >> 1); |
|
return pts; |
|
} |
|
|
|
/* return non zero if a packet could be constructed */ |
|
static void mpegts_push_data(void *opaque, |
|
const uint8_t *buf, int buf_size, int is_start) |
|
{ |
|
PESContext *pes = opaque; |
|
MpegTSContext *ts = pes->ts; |
|
const uint8_t *p; |
|
int len, code; |
|
|
|
if (is_start) { |
|
pes->state = MPEGTS_HEADER; |
|
pes->data_index = 0; |
|
} |
|
p = buf; |
|
while (buf_size > 0) { |
|
switch(pes->state) { |
|
case MPEGTS_HEADER: |
|
len = PES_START_SIZE - pes->data_index; |
|
if (len > buf_size) |
|
len = buf_size; |
|
memcpy(pes->header + pes->data_index, p, len); |
|
pes->data_index += len; |
|
p += len; |
|
buf_size -= len; |
|
if (pes->data_index == PES_START_SIZE) { |
|
/* we got all the PES or section header. We can now |
|
decide */ |
|
#if 0 |
|
av_hex_dump(pes->header, pes->data_index); |
|
#endif |
|
if (pes->header[0] == 0x00 && pes->header[1] == 0x00 && |
|
pes->header[2] == 0x01) { |
|
/* it must be an mpeg2 PES stream */ |
|
code = pes->header[3] | 0x100; |
|
if (!((code >= 0x1c0 && code <= 0x1df) || |
|
(code >= 0x1e0 && code <= 0x1ef) || |
|
(code == 0x1bd))) |
|
goto skip; |
|
if (!pes->st) { |
|
/* allocate stream */ |
|
new_pes_av_stream(pes, code); |
|
} |
|
pes->state = MPEGTS_PESHEADER_FILL; |
|
pes->total_size = (pes->header[4] << 8) | pes->header[5]; |
|
/* NOTE: a zero total size means the PES size is |
|
unbounded */ |
|
if (pes->total_size) |
|
pes->total_size += 6; |
|
pes->pes_header_size = pes->header[8] + 9; |
|
} else { |
|
/* otherwise, it should be a table */ |
|
/* skip packet */ |
|
skip: |
|
pes->state = MPEGTS_SKIP; |
|
continue; |
|
} |
|
} |
|
break; |
|
/**********************************************/ |
|
/* PES packing parsing */ |
|
case MPEGTS_PESHEADER_FILL: |
|
len = pes->pes_header_size - pes->data_index; |
|
if (len > buf_size) |
|
len = buf_size; |
|
memcpy(pes->header + pes->data_index, p, len); |
|
pes->data_index += len; |
|
p += len; |
|
buf_size -= len; |
|
if (pes->data_index == pes->pes_header_size) { |
|
const uint8_t *r; |
|
unsigned int flags; |
|
|
|
flags = pes->header[7]; |
|
r = pes->header + 9; |
|
pes->pts = AV_NOPTS_VALUE; |
|
pes->dts = AV_NOPTS_VALUE; |
|
if ((flags & 0xc0) == 0x80) { |
|
pes->pts = get_pts(r); |
|
r += 5; |
|
} else if ((flags & 0xc0) == 0xc0) { |
|
pes->pts = get_pts(r); |
|
r += 5; |
|
pes->dts = get_pts(r); |
|
r += 5; |
|
} |
|
/* we got the full header. We parse it and get the payload */ |
|
pes->state = MPEGTS_PAYLOAD; |
|
} |
|
break; |
|
case MPEGTS_PAYLOAD: |
|
if (pes->total_size) { |
|
len = pes->total_size - pes->data_index; |
|
if (len > buf_size) |
|
len = buf_size; |
|
} else { |
|
len = buf_size; |
|
} |
|
if (len > 0) { |
|
AVPacket *pkt = ts->pkt; |
|
if (pes->st && av_new_packet(pkt, len) == 0) { |
|
memcpy(pkt->data, p, len); |
|
pkt->stream_index = pes->st->index; |
|
pkt->pts = pes->pts; |
|
pkt->dts = pes->dts; |
|
/* reset pts values */ |
|
pes->pts = AV_NOPTS_VALUE; |
|
pes->dts = AV_NOPTS_VALUE; |
|
ts->stop_parse = 1; |
|
return; |
|
} |
|
} |
|
buf_size = 0; |
|
break; |
|
case MPEGTS_SKIP: |
|
buf_size = 0; |
|
break; |
|
} |
|
} |
|
} |
|
|
|
static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code) |
|
{ |
|
AVStream *st; |
|
int codec_type, codec_id; |
|
|
|
switch(pes->stream_type){ |
|
case STREAM_TYPE_AUDIO_MPEG1: |
|
case STREAM_TYPE_AUDIO_MPEG2: |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_MP3; |
|
break; |
|
case STREAM_TYPE_VIDEO_MPEG1: |
|
case STREAM_TYPE_VIDEO_MPEG2: |
|
codec_type = CODEC_TYPE_VIDEO; |
|
codec_id = CODEC_ID_MPEG2VIDEO; |
|
break; |
|
case STREAM_TYPE_VIDEO_MPEG4: |
|
codec_type = CODEC_TYPE_VIDEO; |
|
codec_id = CODEC_ID_MPEG4; |
|
break; |
|
case STREAM_TYPE_VIDEO_H264: |
|
codec_type = CODEC_TYPE_VIDEO; |
|
codec_id = CODEC_ID_H264; |
|
break; |
|
case STREAM_TYPE_AUDIO_AAC: |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_AAC; |
|
break; |
|
case STREAM_TYPE_AUDIO_AC3: |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_AC3; |
|
break; |
|
case STREAM_TYPE_AUDIO_DTS: |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_DTS; |
|
break; |
|
case STREAM_TYPE_SUBTITLE_DVB: |
|
codec_type = CODEC_TYPE_SUBTITLE; |
|
codec_id = CODEC_ID_DVB_SUBTITLE; |
|
break; |
|
default: |
|
if (code >= 0x1c0 && code <= 0x1df) { |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_MP2; |
|
} else if (code == 0x1bd) { |
|
codec_type = CODEC_TYPE_AUDIO; |
|
codec_id = CODEC_ID_AC3; |
|
} else { |
|
codec_type = CODEC_TYPE_VIDEO; |
|
codec_id = CODEC_ID_MPEG1VIDEO; |
|
} |
|
break; |
|
} |
|
st = av_new_stream(pes->stream, pes->pid); |
|
if (st) { |
|
av_set_pts_info(st, 33, 1, 90000); |
|
st->priv_data = pes; |
|
st->codec->codec_type = codec_type; |
|
st->codec->codec_id = codec_id; |
|
st->need_parsing = 1; |
|
pes->st = st; |
|
} |
|
return st; |
|
} |
|
|
|
|
|
static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type) |
|
{ |
|
MpegTSFilter *tss; |
|
PESContext *pes; |
|
|
|
/* if no pid found, then add a pid context */ |
|
pes = av_mallocz(sizeof(PESContext)); |
|
if (!pes) |
|
return 0; |
|
pes->ts = ts; |
|
pes->stream = ts->stream; |
|
pes->pid = pid; |
|
pes->stream_type = stream_type; |
|
tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes); |
|
if (!tss) { |
|
av_free(pes); |
|
return 0; |
|
} |
|
return pes; |
|
} |
|
|
|
/* handle one TS packet */ |
|
static void handle_packet(MpegTSContext *ts, const uint8_t *packet) |
|
{ |
|
AVFormatContext *s = ts->stream; |
|
MpegTSFilter *tss; |
|
int len, pid, cc, cc_ok, afc, is_start; |
|
const uint8_t *p, *p_end; |
|
|
|
pid = ((packet[1] & 0x1f) << 8) | packet[2]; |
|
is_start = packet[1] & 0x40; |
|
tss = ts->pids[pid]; |
|
if (ts->auto_guess && tss == NULL && is_start) { |
|
add_pes_stream(ts, pid, 0); |
|
tss = ts->pids[pid]; |
|
} |
|
if (!tss) |
|
return; |
|
|
|
/* continuity check (currently not used) */ |
|
cc = (packet[3] & 0xf); |
|
cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc)); |
|
tss->last_cc = cc; |
|
|
|
/* skip adaptation field */ |
|
afc = (packet[3] >> 4) & 3; |
|
p = packet + 4; |
|
if (afc == 0) /* reserved value */ |
|
return; |
|
if (afc == 2) /* adaptation field only */ |
|
return; |
|
if (afc == 3) { |
|
/* skip adapation field */ |
|
p += p[0] + 1; |
|
} |
|
/* if past the end of packet, ignore */ |
|
p_end = packet + TS_PACKET_SIZE; |
|
if (p >= p_end) |
|
return; |
|
|
|
if (tss->type == MPEGTS_SECTION) { |
|
if (is_start) { |
|
/* pointer field present */ |
|
len = *p++; |
|
if (p + len > p_end) |
|
return; |
|
if (len && cc_ok) { |
|
/* write remaining section bytes */ |
|
write_section_data(s, tss, |
|
p, len, 0); |
|
/* check whether filter has been closed */ |
|
if (!ts->pids[pid]) |
|
return; |
|
} |
|
p += len; |
|
if (p < p_end) { |
|
write_section_data(s, tss, |
|
p, p_end - p, 1); |
|
} |
|
} else { |
|
if (cc_ok) { |
|
write_section_data(s, tss, |
|
p, p_end - p, 0); |
|
} |
|
} |
|
} else { |
|
tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque, |
|
p, p_end - p, is_start); |
|
} |
|
} |
|
|
|
/* XXX: try to find a better synchro over several packets (use |
|
get_packet_size() ?) */ |
|
static int mpegts_resync(ByteIOContext *pb) |
|
{ |
|
int c, i; |
|
|
|
for(i = 0;i < MAX_RESYNC_SIZE; i++) { |
|
c = url_fgetc(pb); |
|
if (c < 0) |
|
return -1; |
|
if (c == 0x47) { |
|
url_fseek(pb, -1, SEEK_CUR); |
|
return 0; |
|
} |
|
} |
|
/* no sync found */ |
|
return -1; |
|
} |
|
|
|
/* return -1 if error or EOF. Return 0 if OK. */ |
|
static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size) |
|
{ |
|
int skip, len; |
|
|
|
for(;;) { |
|
len = get_buffer(pb, buf, TS_PACKET_SIZE); |
|
if (len != TS_PACKET_SIZE) |
|
return AVERROR_IO; |
|
/* check paquet sync byte */ |
|
if (buf[0] != 0x47) { |
|
/* find a new packet start */ |
|
url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR); |
|
if (mpegts_resync(pb) < 0) |
|
return AVERROR_INVALIDDATA; |
|
else |
|
continue; |
|
} else { |
|
skip = raw_packet_size - TS_PACKET_SIZE; |
|
if (skip > 0) |
|
url_fskip(pb, skip); |
|
break; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int handle_packets(MpegTSContext *ts, int nb_packets) |
|
{ |
|
AVFormatContext *s = ts->stream; |
|
ByteIOContext *pb = &s->pb; |
|
uint8_t packet[TS_PACKET_SIZE]; |
|
int packet_num, ret; |
|
|
|
ts->stop_parse = 0; |
|
packet_num = 0; |
|
for(;;) { |
|
if (ts->stop_parse) |
|
break; |
|
packet_num++; |
|
if (nb_packets != 0 && packet_num >= nb_packets) |
|
break; |
|
ret = read_packet(pb, packet, ts->raw_packet_size); |
|
if (ret != 0) |
|
return ret; |
|
handle_packet(ts, packet); |
|
} |
|
return 0; |
|
} |
|
|
|
static int mpegts_probe(AVProbeData *p) |
|
{ |
|
#if 1 |
|
const int size= p->buf_size; |
|
int score, fec_score, dvhs_score; |
|
#define CHECK_COUNT 10 |
|
|
|
if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT)) |
|
return -1; |
|
|
|
score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL); |
|
dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL); |
|
fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL); |
|
// av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score); |
|
|
|
// we need a clear definition for the returned score otherwise things will become messy sooner or later |
|
if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT; |
|
else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT; |
|
else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT; |
|
else return -1; |
|
#else |
|
/* only use the extension for safer guess */ |
|
if (match_ext(p->filename, "ts")) |
|
return AVPROBE_SCORE_MAX; |
|
else |
|
return 0; |
|
#endif |
|
} |
|
|
|
static void set_service_cb(void *opaque, int ret) |
|
{ |
|
MpegTSContext *ts = opaque; |
|
ts->set_service_ret = ret; |
|
ts->stop_parse = 1; |
|
} |
|
|
|
/* return the 90 kHz PCR and the extension for the 27 MHz PCR. return |
|
(-1) if not available */ |
|
static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, |
|
const uint8_t *packet) |
|
{ |
|
int afc, len, flags; |
|
const uint8_t *p; |
|
unsigned int v; |
|
|
|
afc = (packet[3] >> 4) & 3; |
|
if (afc <= 1) |
|
return -1; |
|
p = packet + 4; |
|
len = p[0]; |
|
p++; |
|
if (len == 0) |
|
return -1; |
|
flags = *p++; |
|
len--; |
|
if (!(flags & 0x10)) |
|
return -1; |
|
if (len < 6) |
|
return -1; |
|
v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; |
|
*ppcr_high = ((int64_t)v << 1) | (p[4] >> 7); |
|
*ppcr_low = ((p[4] & 1) << 8) | p[5]; |
|
return 0; |
|
} |
|
|
|
static int mpegts_read_header(AVFormatContext *s, |
|
AVFormatParameters *ap) |
|
{ |
|
MpegTSContext *ts = s->priv_data; |
|
ByteIOContext *pb = &s->pb; |
|
uint8_t buf[1024]; |
|
int len, sid, i; |
|
int64_t pos; |
|
MpegTSService *service; |
|
|
|
if (ap) { |
|
ts->mpeg2ts_raw = ap->mpeg2ts_raw; |
|
ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr; |
|
} |
|
|
|
/* read the first 1024 bytes to get packet size */ |
|
pos = url_ftell(pb); |
|
len = get_buffer(pb, buf, sizeof(buf)); |
|
if (len != sizeof(buf)) |
|
goto fail; |
|
ts->raw_packet_size = get_packet_size(buf, sizeof(buf)); |
|
if (ts->raw_packet_size <= 0) |
|
goto fail; |
|
ts->stream = s; |
|
ts->auto_guess = 0; |
|
|
|
goto_auto_guess: |
|
if (!ts->mpeg2ts_raw) { |
|
/* normal demux */ |
|
|
|
if (!ts->auto_guess) { |
|
ts->set_service_ret = -1; |
|
|
|
/* first do a scaning to get all the services */ |
|
url_fseek(pb, pos, SEEK_SET); |
|
mpegts_scan_sdt(ts); |
|
|
|
handle_packets(ts, s->probesize); |
|
|
|
if (ts->nb_services <= 0) { |
|
/* no SDT found, we try to look at the PAT */ |
|
|
|
/* First remove the SDT filters from each PID */ |
|
int i; |
|
for (i=0; i < NB_PID_MAX; i++) { |
|
if (ts->pids[i]) |
|
mpegts_close_filter(ts, ts->pids[i]); |
|
} |
|
url_fseek(pb, pos, SEEK_SET); |
|
mpegts_scan_pat(ts); |
|
|
|
handle_packets(ts, s->probesize); |
|
} |
|
|
|
if (ts->nb_services <= 0) { |
|
/* raw transport stream */ |
|
ts->auto_guess = 1; |
|
s->ctx_flags |= AVFMTCTX_NOHEADER; |
|
goto do_pcr; |
|
} |
|
|
|
/* tune to first service found */ |
|
for(i=0; i<ts->nb_services && ts->set_service_ret; i++){ |
|
service = ts->services[i]; |
|
sid = service->sid; |
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "tuning to '%s'\n", service->name); |
|
#endif |
|
|
|
/* now find the info for the first service if we found any, |
|
otherwise try to filter all PATs */ |
|
|
|
url_fseek(pb, pos, SEEK_SET); |
|
mpegts_set_service(ts, sid, set_service_cb, ts); |
|
|
|
handle_packets(ts, s->probesize); |
|
} |
|
/* if could not find service, exit */ |
|
|
|
if (ts->set_service_ret != 0) { |
|
if(ts->auto_guess) |
|
return -1; |
|
else { |
|
//let's retry with auto_guess set |
|
ts->auto_guess = 1; |
|
goto goto_auto_guess; |
|
} |
|
} |
|
|
|
#ifdef DEBUG_SI |
|
av_log(NULL, AV_LOG_DEBUG, "tuning done\n"); |
|
#endif |
|
} |
|
s->ctx_flags |= AVFMTCTX_NOHEADER; |
|
} else { |
|
AVStream *st; |
|
int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l; |
|
int64_t pcrs[2], pcr_h; |
|
int packet_count[2]; |
|
uint8_t packet[TS_PACKET_SIZE]; |
|
|
|
/* only read packets */ |
|
|
|
do_pcr: |
|
st = av_new_stream(s, 0); |
|
if (!st) |
|
goto fail; |
|
av_set_pts_info(st, 60, 1, 27000000); |
|
st->codec->codec_type = CODEC_TYPE_DATA; |
|
st->codec->codec_id = CODEC_ID_MPEG2TS; |
|
|
|
/* we iterate until we find two PCRs to estimate the bitrate */ |
|
pcr_pid = -1; |
|
nb_pcrs = 0; |
|
nb_packets = 0; |
|
for(;;) { |
|
ret = read_packet(&s->pb, packet, ts->raw_packet_size); |
|
if (ret < 0) |
|
return -1; |
|
pid = ((packet[1] & 0x1f) << 8) | packet[2]; |
|
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++; |
|
} |
|
ts->pcr_pid = pcr_pid; |
|
|
|
/* NOTE1: the bitrate is computed without the FEC */ |
|
/* NOTE2: it is only the bitrate of the start of the stream */ |
|
ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]); |
|
ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0]; |
|
s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr; |
|
st->codec->bit_rate = s->bit_rate; |
|
st->start_time = ts->cur_pcr; |
|
#if 0 |
|
av_log(NULL, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n", |
|
st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr); |
|
#endif |
|
} |
|
|
|
url_fseek(pb, pos, SEEK_SET); |
|
return 0; |
|
fail: |
|
return -1; |
|
} |
|
|
|
#define MAX_PACKET_READAHEAD ((128 * 1024) / 188) |
|
|
|
static int mpegts_raw_read_packet(AVFormatContext *s, |
|
AVPacket *pkt) |
|
{ |
|
MpegTSContext *ts = s->priv_data; |
|
int ret, i; |
|
int64_t pcr_h, next_pcr_h, pos; |
|
int pcr_l, next_pcr_l; |
|
uint8_t pcr_buf[12]; |
|
|
|
if (av_new_packet(pkt, TS_PACKET_SIZE) < 0) |
|
return -ENOMEM; |
|
pkt->pos= url_ftell(&s->pb); |
|
ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size); |
|
if (ret < 0) { |
|
av_free_packet(pkt); |
|
return ret; |
|
} |
|
if (ts->mpeg2ts_compute_pcr) { |
|
/* compute exact PCR for each packet */ |
|
if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) { |
|
/* we read the next PCR (XXX: optimize it by using a bigger buffer */ |
|
pos = url_ftell(&s->pb); |
|
for(i = 0; i < MAX_PACKET_READAHEAD; i++) { |
|
url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET); |
|
get_buffer(&s->pb, pcr_buf, 12); |
|
if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) { |
|
/* XXX: not precise enough */ |
|
ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) / |
|
(i + 1); |
|
break; |
|
} |
|
} |
|
url_fseek(&s->pb, pos, SEEK_SET); |
|
/* no next PCR found: we use previous increment */ |
|
ts->cur_pcr = pcr_h * 300 + pcr_l; |
|
} |
|
pkt->pts = ts->cur_pcr; |
|
pkt->duration = ts->pcr_incr; |
|
ts->cur_pcr += ts->pcr_incr; |
|
} |
|
pkt->stream_index = 0; |
|
return 0; |
|
} |
|
|
|
static int mpegts_read_packet(AVFormatContext *s, |
|
AVPacket *pkt) |
|
{ |
|
MpegTSContext *ts = s->priv_data; |
|
|
|
if (!ts->mpeg2ts_raw) { |
|
ts->pkt = pkt; |
|
return handle_packets(ts, 0); |
|
} else { |
|
return mpegts_raw_read_packet(s, pkt); |
|
} |
|
} |
|
|
|
static int mpegts_read_close(AVFormatContext *s) |
|
{ |
|
MpegTSContext *ts = s->priv_data; |
|
int i; |
|
for(i=0;i<NB_PID_MAX;i++) |
|
if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]); |
|
|
|
for(i = 0; i < ts->nb_services; i++){ |
|
av_free(ts->services[i]->provider_name); |
|
av_free(ts->services[i]->name); |
|
av_free(ts->services[i]); |
|
} |
|
av_freep(&ts->services); |
|
|
|
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, pid; |
|
const int find_next= 1; |
|
pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size; |
|
if (find_next) { |
|
for(;;) { |
|
url_fseek(&s->pb, pos, SEEK_SET); |
|
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE) |
|
return AV_NOPTS_VALUE; |
|
pid = ((buf[1] & 0x1f) << 8) | buf[2]; |
|
if (pid == ts->pcr_pid && |
|
parse_pcr(×tamp, &pcr_l, buf) == 0) { |
|
break; |
|
} |
|
pos += ts->raw_packet_size; |
|
} |
|
} else { |
|
for(;;) { |
|
pos -= ts->raw_packet_size; |
|
if (pos < 0) |
|
return AV_NOPTS_VALUE; |
|
url_fseek(&s->pb, pos, SEEK_SET); |
|
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE) |
|
return AV_NOPTS_VALUE; |
|
pid = ((buf[1] & 0x1f) << 8) | buf[2]; |
|
if (pid == ts->pcr_pid && |
|
parse_pcr(×tamp, &pcr_l, buf) == 0) { |
|
break; |
|
} |
|
} |
|
} |
|
*ppos = pos; |
|
|
|
return timestamp; |
|
} |
|
|
|
static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){ |
|
MpegTSContext *ts = s->priv_data; |
|
uint8_t buf[TS_PACKET_SIZE]; |
|
int64_t pos; |
|
|
|
if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0) |
|
return -1; |
|
|
|
pos= url_ftell(&s->pb); |
|
|
|
for(;;) { |
|
url_fseek(&s->pb, pos, SEEK_SET); |
|
if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE) |
|
return -1; |
|
// pid = ((buf[1] & 0x1f) << 8) | buf[2]; |
|
if(buf[1] & 0x40) break; |
|
pos += ts->raw_packet_size; |
|
} |
|
url_fseek(&s->pb, pos, SEEK_SET); |
|
|
|
return 0; |
|
} |
|
|
|
/**************************************************************/ |
|
/* parsing functions - called from other demuxers such as RTP */ |
|
|
|
MpegTSContext *mpegts_parse_open(AVFormatContext *s) |
|
{ |
|
MpegTSContext *ts; |
|
|
|
ts = av_mallocz(sizeof(MpegTSContext)); |
|
if (!ts) |
|
return NULL; |
|
/* no stream case, currently used by RTP */ |
|
ts->raw_packet_size = TS_PACKET_SIZE; |
|
ts->stream = s; |
|
ts->auto_guess = 1; |
|
return ts; |
|
} |
|
|
|
/* return the consumed length if a packet was output, or -1 if no |
|
packet is output */ |
|
int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, |
|
const uint8_t *buf, int len) |
|
{ |
|
int len1; |
|
|
|
len1 = len; |
|
ts->pkt = pkt; |
|
ts->stop_parse = 0; |
|
for(;;) { |
|
if (ts->stop_parse) |
|
break; |
|
if (len < TS_PACKET_SIZE) |
|
return -1; |
|
if (buf[0] != 0x47) { |
|
buf++; |
|
len--; |
|
} else { |
|
handle_packet(ts, buf); |
|
buf += TS_PACKET_SIZE; |
|
len -= TS_PACKET_SIZE; |
|
} |
|
} |
|
return len1 - len; |
|
} |
|
|
|
void mpegts_parse_close(MpegTSContext *ts) |
|
{ |
|
int i; |
|
|
|
for(i=0;i<NB_PID_MAX;i++) |
|
av_free(ts->pids[i]); |
|
av_free(ts); |
|
} |
|
|
|
AVInputFormat mpegts_demuxer = { |
|
"mpegts", |
|
"MPEG2 transport stream format", |
|
sizeof(MpegTSContext), |
|
mpegts_probe, |
|
mpegts_read_header, |
|
mpegts_read_packet, |
|
mpegts_read_close, |
|
read_seek, |
|
mpegts_get_pcr, |
|
.flags = AVFMT_SHOW_IDS, |
|
};
|
|
|