/* * MPEG2 transport stream (aka DVB) muxer * Copyright (c) 2003 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/bswap.h" #include "libavutil/crc.h" #include "libavutil/dict.h" #include "libavutil/mathematics.h" #include "libavutil/opt.h" #include "libavcodec/mpegvideo.h" #include "avformat.h" #include "internal.h" #include "mpegts.h" #define PCR_TIME_BASE 27000000 /* write DVB SI sections */ /*********************************************/ /* mpegts section writer */ typedef struct MpegTSSection { int pid; int cc; void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); void *opaque; } MpegTSSection; typedef struct MpegTSService { MpegTSSection pmt; /* MPEG2 pmt table context */ int sid; /* service ID */ char *name; char *provider_name; int pcr_pid; int pcr_packet_count; int pcr_packet_period; } MpegTSService; typedef struct MpegTSWrite { const AVClass *av_class; MpegTSSection pat; /* MPEG2 pat table */ MpegTSSection sdt; /* MPEG2 sdt table context */ MpegTSService **services; int sdt_packet_count; int sdt_packet_period; int pat_packet_count; int pat_packet_period; int nb_services; int onid; int tsid; int64_t first_pcr; int mux_rate; ///< set to 1 when VBR int pes_payload_size; int transport_stream_id; int original_network_id; int service_id; int pmt_start_pid; int start_pid; int reemit_pat_pmt; // backward compatibility #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01 #define MPEGTS_FLAG_AAC_LATM 0x02 int flags; } MpegTSWrite; /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ #define DEFAULT_PES_HEADER_FREQ 16 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) static const AVOption options[] = { { "mpegts_transport_stream_id", "Set transport_stream_id field.", offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, { "mpegts_original_network_id", "Set original_network_id field.", offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, { "mpegts_service_id", "Set service_id field.", offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, { "mpegts_pmt_start_pid", "Set the first pid of the PMT.", offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM}, { "mpegts_start_pid", "Set the first pid.", offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM}, { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM}, { "pes_payload_size", "Minimum PES packet payload in bytes", offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM}, { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" }, { "resend_headers", "Reemit PAT/PMT before writing the next packet", 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"}, { "latm", "Use LATM packetization for AAC", 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"}, // backward compatibility { "resend_headers", "Reemit PAT/PMT before writing the next packet", offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM}, { NULL }, }; static const AVClass mpegts_muxer_class = { .class_name = "MPEGTS muxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; /* NOTE: 4 bytes must be left at the end for the crc32 */ static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) { unsigned int crc; unsigned char packet[TS_PACKET_SIZE]; const unsigned char *buf_ptr; unsigned char *q; int first, b, len1, left; crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); buf[len - 4] = (crc >> 24) & 0xff; buf[len - 3] = (crc >> 16) & 0xff; buf[len - 2] = (crc >> 8) & 0xff; buf[len - 1] = (crc) & 0xff; /* send each packet */ buf_ptr = buf; while (len > 0) { first = (buf == buf_ptr); q = packet; *q++ = 0x47; b = (s->pid >> 8); if (first) b |= 0x40; *q++ = b; *q++ = s->pid; s->cc = (s->cc + 1) & 0xf; *q++ = 0x10 | s->cc; if (first) *q++ = 0; /* 0 offset */ len1 = TS_PACKET_SIZE - (q - packet); if (len1 > len) len1 = len; memcpy(q, buf_ptr, len1); q += len1; /* add known padding data */ left = TS_PACKET_SIZE - (q - packet); if (left > 0) memset(q, 0xff, left); s->write_packet(s, packet); buf_ptr += len1; len -= len1; } } static inline void put16(uint8_t **q_ptr, int val) { uint8_t *q; q = *q_ptr; *q++ = val >> 8; *q++ = val; *q_ptr = q; } static int mpegts_write_section1(MpegTSSection *s, int tid, int id, int version, int sec_num, int last_sec_num, uint8_t *buf, int len) { uint8_t section[1024], *q; unsigned int tot_len; /* reserved_future_use field must be set to 1 for SDT */ unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000; tot_len = 3 + 5 + len + 4; /* check if not too big */ if (tot_len > 1024) return -1; q = section; *q++ = tid; put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ put16(&q, id); *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ *q++ = sec_num; *q++ = last_sec_num; memcpy(q, buf, len); mpegts_write_section(s, section, tot_len); return 0; } /*********************************************/ /* mpegts writer */ #define DEFAULT_PROVIDER_NAME "Libav" #define DEFAULT_SERVICE_NAME "Service01" /* we retransmit the SI info at this rate */ #define SDT_RETRANS_TIME 500 #define PAT_RETRANS_TIME 100 #define PCR_RETRANS_TIME 20 typedef struct MpegTSWriteStream { struct MpegTSService *service; int pid; /* stream associated pid */ int cc; int payload_size; int first_pts_check; ///< first pts check needed int64_t payload_pts; int64_t payload_dts; int payload_flags; uint8_t *payload; AVFormatContext *amux; } MpegTSWriteStream; static void mpegts_write_pat(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[1012], *q; int i; q = data; for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; put16(&q, service->sid); put16(&q, 0xe000 | service->pmt.pid); } mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, data, q - data); } static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) { MpegTSWrite *ts = s->priv_data; uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; int val, stream_type, i; q = data; put16(&q, 0xe000 | service->pcr_pid); program_info_length_ptr = q; q += 2; /* patched after */ /* put program info here */ val = 0xf000 | (q - program_info_length_ptr - 2); program_info_length_ptr[0] = val >> 8; program_info_length_ptr[1] = val; for(i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *ts_st = st->priv_data; AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0); switch(st->codec->codec_id) { case AV_CODEC_ID_MPEG1VIDEO: case AV_CODEC_ID_MPEG2VIDEO: stream_type = STREAM_TYPE_VIDEO_MPEG2; break; case AV_CODEC_ID_MPEG4: stream_type = STREAM_TYPE_VIDEO_MPEG4; break; case AV_CODEC_ID_H264: stream_type = STREAM_TYPE_VIDEO_H264; break; case AV_CODEC_ID_CAVS: stream_type = STREAM_TYPE_VIDEO_CAVS; break; case AV_CODEC_ID_DIRAC: stream_type = STREAM_TYPE_VIDEO_DIRAC; break; case AV_CODEC_ID_MP2: case AV_CODEC_ID_MP3: stream_type = STREAM_TYPE_AUDIO_MPEG1; break; case AV_CODEC_ID_AAC: stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC; break; case AV_CODEC_ID_AAC_LATM: stream_type = STREAM_TYPE_AUDIO_AAC_LATM; break; case AV_CODEC_ID_AC3: stream_type = STREAM_TYPE_AUDIO_AC3; break; default: stream_type = STREAM_TYPE_PRIVATE_DATA; break; } *q++ = stream_type; put16(&q, 0xe000 | ts_st->pid); desc_length_ptr = q; q += 2; /* patched after */ /* write optional descriptors here */ switch(st->codec->codec_type) { case AVMEDIA_TYPE_AUDIO: if (lang) { char *p; char *next = lang->value; uint8_t *len_ptr; *q++ = 0x0a; /* ISO 639 language descriptor */ len_ptr = q++; *len_ptr = 0; for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) { next = strchr(p, ','); if (strlen(p) != 3 && (!next || next != p + 3)) continue; /* not a 3-letter code */ *q++ = *p++; *q++ = *p++; *q++ = *p++; if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS) *q++ = 0x01; else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) *q++ = 0x02; else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED) *q++ = 0x03; else *q++ = 0; /* undefined type */ *len_ptr += 4; } if (*len_ptr == 0) q -= 2; /* no language codes were written */ } break; case AVMEDIA_TYPE_SUBTITLE: { const char *language; language = lang && strlen(lang->value)==3 ? lang->value : "eng"; *q++ = 0x59; *q++ = 8; *q++ = language[0]; *q++ = language[1]; *q++ = language[2]; *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ if(st->codec->extradata_size == 4) { memcpy(q, st->codec->extradata, 4); q += 4; } else { put16(&q, 1); /* page id */ put16(&q, 1); /* ancillary page id */ } } break; case AVMEDIA_TYPE_VIDEO: if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { *q++ = 0x05; /*MPEG-2 registration descriptor*/ *q++ = 4; *q++ = 'd'; *q++ = 'r'; *q++ = 'a'; *q++ = 'c'; } break; } val = 0xf000 | (q - desc_length_ptr - 2); desc_length_ptr[0] = val >> 8; desc_length_ptr[1] = val; } mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, data, q - data); } /* NOTE: str == NULL is accepted for an empty string */ static void putstr8(uint8_t **q_ptr, const char *str) { uint8_t *q; int len; q = *q_ptr; if (!str) len = 0; else len = strlen(str); *q++ = len; memcpy(q, str, len); q += len; *q_ptr = q; } static void mpegts_write_sdt(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; int i, running_status, free_ca_mode, val; q = data; put16(&q, ts->onid); *q++ = 0xff; for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; put16(&q, service->sid); *q++ = 0xfc | 0x00; /* currently no EIT info */ desc_list_len_ptr = q; q += 2; running_status = 4; /* running */ free_ca_mode = 0; /* write only one descriptor for the service name and provider */ *q++ = 0x48; desc_len_ptr = q; q++; *q++ = 0x01; /* digital television service */ putstr8(&q, service->provider_name); putstr8(&q, service->name); desc_len_ptr[0] = q - desc_len_ptr - 1; /* fill descriptor length */ val = (running_status << 13) | (free_ca_mode << 12) | (q - desc_list_len_ptr - 2); desc_list_len_ptr[0] = val >> 8; desc_list_len_ptr[1] = val; } mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, data, q - data); } static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid, const char *provider_name, const char *name) { MpegTSService *service; service = av_mallocz(sizeof(MpegTSService)); if (!service) return NULL; service->pmt.pid = ts->pmt_start_pid + ts->nb_services; service->sid = sid; service->provider_name = av_strdup(provider_name); service->name = av_strdup(name); service->pcr_pid = 0x1fff; dynarray_add(&ts->services, &ts->nb_services, service); return service; } static void section_write_packet(MpegTSSection *s, const uint8_t *packet) { AVFormatContext *ctx = s->opaque; avio_write(ctx->pb, packet, TS_PACKET_SIZE); } static int mpegts_write_header(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st; MpegTSService *service; AVStream *st, *pcr_st = NULL; AVDictionaryEntry *title, *provider; int i, j; const char *service_name; const char *provider_name; int *pids; int ret; if (s->max_delay < 0) /* Not set by the caller */ s->max_delay = 0; // round up to a whole number of TS packets ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14; ts->tsid = ts->transport_stream_id; ts->onid = ts->original_network_id; /* allocate a single DVB service */ title = av_dict_get(s->metadata, "service_name", NULL, 0); if (!title) title = av_dict_get(s->metadata, "title", NULL, 0); service_name = title ? title->value : DEFAULT_SERVICE_NAME; provider = av_dict_get(s->metadata, "service_provider", NULL, 0); provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME; service = mpegts_add_service(ts, ts->service_id, provider_name, service_name); service->pmt.write_packet = section_write_packet; service->pmt.opaque = s; service->pmt.cc = 15; ts->pat.pid = PAT_PID; ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write ts->pat.write_packet = section_write_packet; ts->pat.opaque = s; ts->sdt.pid = SDT_PID; ts->sdt.cc = 15; ts->sdt.write_packet = section_write_packet; ts->sdt.opaque = s; pids = av_malloc(s->nb_streams * sizeof(*pids)); if (!pids) return AVERROR(ENOMEM); /* assign pids to each stream */ for(i = 0;i < s->nb_streams; i++) { st = s->streams[i]; avpriv_set_pts_info(st, 33, 1, 90000); ts_st = av_mallocz(sizeof(MpegTSWriteStream)); if (!ts_st) { ret = AVERROR(ENOMEM); goto fail; } st->priv_data = ts_st; ts_st->payload = av_mallocz(ts->pes_payload_size); if (!ts_st->payload) { ret = AVERROR(ENOMEM); goto fail; } ts_st->service = service; /* MPEG pid values < 16 are reserved. Applications which set st->id in * this range are assigned a calculated pid. */ if (st->id < 16) { ts_st->pid = ts->start_pid + i; } else if (st->id < 0x1FFF) { ts_st->pid = st->id; } else { av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id); ret = AVERROR(EINVAL); goto fail; } if (ts_st->pid == service->pmt.pid) { av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); ret = AVERROR(EINVAL); goto fail; } for (j = 0; j < i; j++) if (pids[j] == ts_st->pid) { av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); ret = AVERROR(EINVAL); goto fail; } pids[i] = ts_st->pid; ts_st->payload_pts = AV_NOPTS_VALUE; ts_st->payload_dts = AV_NOPTS_VALUE; ts_st->first_pts_check = 1; ts_st->cc = 15; /* update PCR pid by using the first video stream */ if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && service->pcr_pid == 0x1fff) { service->pcr_pid = ts_st->pid; pcr_st = st; } if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size > 0) { AVStream *ast; ts_st->amux = avformat_alloc_context(); if (!ts_st->amux) { ret = AVERROR(ENOMEM); goto fail; } ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL); if (!ts_st->amux->oformat) { ret = AVERROR(EINVAL); goto fail; } ast = avformat_new_stream(ts_st->amux, NULL); ret = avcodec_copy_context(ast->codec, st->codec); if (ret != 0) goto fail; ret = avformat_write_header(ts_st->amux, NULL); if (ret < 0) goto fail; } } av_free(pids); /* if no video stream, use the first stream as PCR */ if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { pcr_st = s->streams[0]; ts_st = pcr_st->priv_data; service->pcr_pid = ts_st->pid; } if (ts->mux_rate > 1) { service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / (TS_PACKET_SIZE * 8 * 1000); ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / (TS_PACKET_SIZE * 8 * 1000); ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / (TS_PACKET_SIZE * 8 * 1000); ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE); } else { /* Arbitrary values, PAT/PMT could be written on key frames */ ts->sdt_packet_period = 200; ts->pat_packet_period = 40; if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { if (!pcr_st->codec->frame_size) { av_log(s, AV_LOG_WARNING, "frame size not set\n"); service->pcr_packet_period = pcr_st->codec->sample_rate/(10*512); } else { service->pcr_packet_period = pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size); } } else { // max delta PCR 0.1s service->pcr_packet_period = pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num); } } // output a PCR as soon as possible service->pcr_packet_count = service->pcr_packet_period; ts->pat_packet_count = ts->pat_packet_period-1; ts->sdt_packet_count = ts->sdt_packet_period-1; if (ts->mux_rate == 1) av_log(s, AV_LOG_VERBOSE, "muxrate VBR, "); else av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate); av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, " "sdt every %d, pat/pmt every %d pkts\n", service->pcr_packet_period, ts->sdt_packet_period, ts->pat_packet_period); avio_flush(s->pb); return 0; fail: av_free(pids); for(i = 0;i < s->nb_streams; i++) { MpegTSWriteStream *ts_st; st = s->streams[i]; ts_st = st->priv_data; if (ts_st) { av_freep(&ts_st->payload); if (ts_st->amux) { avformat_free_context(ts_st->amux); ts_st->amux = NULL; } } av_freep(&st->priv_data); } return ret; } /* send SDT, PAT and PMT tables regulary */ static void retransmit_si_info(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; int i; if (++ts->sdt_packet_count == ts->sdt_packet_period) { ts->sdt_packet_count = 0; mpegts_write_sdt(s); } if (++ts->pat_packet_count == ts->pat_packet_period) { ts->pat_packet_count = 0; mpegts_write_pat(s); for(i = 0; i < ts->nb_services; i++) { mpegts_write_pmt(s, ts->services[i]); } } } static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb) { return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) + ts->first_pcr; } static int write_pcr_bits(uint8_t *buf, int64_t pcr) { int64_t pcr_low = pcr % 300, pcr_high = pcr / 300; *buf++ = pcr_high >> 25; *buf++ = pcr_high >> 17; *buf++ = pcr_high >> 9; *buf++ = pcr_high >> 1; *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e; *buf++ = pcr_low; return 6; } /* Write a single null transport stream packet */ static void mpegts_insert_null_packet(AVFormatContext *s) { uint8_t *q; uint8_t buf[TS_PACKET_SIZE]; q = buf; *q++ = 0x47; *q++ = 0x00 | 0x1f; *q++ = 0xff; *q++ = 0x10; memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf)); avio_write(s->pb, buf, TS_PACKET_SIZE); } /* Write a single transport stream packet with a PCR and no payload */ static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st = st->priv_data; uint8_t *q; uint8_t buf[TS_PACKET_SIZE]; q = buf; *q++ = 0x47; *q++ = ts_st->pid >> 8; *q++ = ts_st->pid; *q++ = 0x20 | ts_st->cc; /* Adaptation only */ /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */ *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ *q++ = 0x10; /* Adaptation flags: PCR present */ /* PCR coded into 6 bytes */ q += write_pcr_bits(q, get_pcr(ts, s->pb)); /* stuffing bytes */ memset(q, 0xFF, TS_PACKET_SIZE - (q - buf)); avio_write(s->pb, buf, TS_PACKET_SIZE); } static void write_pts(uint8_t *q, int fourbits, int64_t pts) { int val; val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; *q++ = val; val = (((pts >> 15) & 0x7fff) << 1) | 1; *q++ = val >> 8; *q++ = val; val = (((pts) & 0x7fff) << 1) | 1; *q++ = val >> 8; *q++ = val; } /* Set an adaptation field flag in an MPEG-TS packet*/ static void set_af_flag(uint8_t *pkt, int flag) { // expect at least one flag to set assert(flag); if ((pkt[3] & 0x20) == 0) { // no AF yet, set adaptation field flag pkt[3] |= 0x20; // 1 byte length, no flags pkt[4] = 1; pkt[5] = 0; } pkt[5] |= flag; } /* Extend the adaptation field by size bytes */ static void extend_af(uint8_t *pkt, int size) { // expect already existing adaptation field assert(pkt[3] & 0x20); pkt[4] += size; } /* Get a pointer to MPEG-TS payload (right after TS packet header) */ static uint8_t *get_ts_payload_start(uint8_t *pkt) { if (pkt[3] & 0x20) return pkt + 5 + pkt[4]; else return pkt + 4; } /* Add a pes header to the front of payload, and segment into an integer number of * ts packets. The final ts packet is padded using an over-sized adaptation header * to exactly fill the last ts packet. * NOTE: 'payload' contains a complete PES payload. */ static void mpegts_write_pes(AVFormatContext *s, AVStream *st, const uint8_t *payload, int payload_size, int64_t pts, int64_t dts, int key) { MpegTSWriteStream *ts_st = st->priv_data; MpegTSWrite *ts = s->priv_data; uint8_t buf[TS_PACKET_SIZE]; uint8_t *q; int val, is_start, len, header_len, write_pcr, private_code, flags; int afc_len, stuffing_len; int64_t pcr = -1; /* avoid warning */ int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); is_start = 1; while (payload_size > 0) { retransmit_si_info(s); write_pcr = 0; if (ts_st->pid == ts_st->service->pcr_pid) { if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames ts_st->service->pcr_packet_count++; if (ts_st->service->pcr_packet_count >= ts_st->service->pcr_packet_period) { ts_st->service->pcr_packet_count = 0; write_pcr = 1; } } if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE && (dts - get_pcr(ts, s->pb)/300) > delay) { /* pcr insert gets priority over null packet insert */ if (write_pcr) mpegts_insert_pcr_only(s, st); else mpegts_insert_null_packet(s); continue; /* recalculate write_pcr and possibly retransmit si_info */ } /* prepare packet header */ q = buf; *q++ = 0x47; val = (ts_st->pid >> 8); if (is_start) val |= 0x40; *q++ = val; *q++ = ts_st->pid; ts_st->cc = (ts_st->cc + 1) & 0xf; *q++ = 0x10 | ts_st->cc; // payload indicator + CC if (key && is_start && pts != AV_NOPTS_VALUE) { // set Random Access for key frames if (ts_st->pid == ts_st->service->pcr_pid) write_pcr = 1; set_af_flag(buf, 0x40); q = get_ts_payload_start(buf); } if (write_pcr) { set_af_flag(buf, 0x10); q = get_ts_payload_start(buf); // add 11, pcr references the last byte of program clock reference base if (ts->mux_rate > 1) pcr = get_pcr(ts, s->pb); else pcr = (dts - delay)*300; if (dts != AV_NOPTS_VALUE && dts < pcr / 300) av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); extend_af(buf, write_pcr_bits(q, pcr)); q = get_ts_payload_start(buf); } if (is_start) { int pes_extension = 0; /* write PES header */ *q++ = 0x00; *q++ = 0x00; *q++ = 0x01; private_code = 0; if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { if (st->codec->codec_id == AV_CODEC_ID_DIRAC) { *q++ = 0xfd; } else *q++ = 0xe0; } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && (st->codec->codec_id == AV_CODEC_ID_MP2 || st->codec->codec_id == AV_CODEC_ID_MP3 || st->codec->codec_id == AV_CODEC_ID_AAC)) { *q++ = 0xc0; } else { *q++ = 0xbd; if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) { private_code = 0x20; } } header_len = 0; flags = 0; if (pts != AV_NOPTS_VALUE) { header_len += 5; flags |= 0x80; } if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { header_len += 5; flags |= 0x40; } if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->codec->codec_id == AV_CODEC_ID_DIRAC) { /* set PES_extension_flag */ pes_extension = 1; flags |= 0x01; /* * One byte for PES2 extension flag + * one byte for extension length + * one byte for extension id */ header_len += 3; } len = payload_size + header_len + 3; if (private_code != 0) len++; if (len > 0xffff) len = 0; *q++ = len >> 8; *q++ = len; val = 0x80; /* data alignment indicator is required for subtitle data */ if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) val |= 0x04; *q++ = val; *q++ = flags; *q++ = header_len; if (pts != AV_NOPTS_VALUE) { write_pts(q, flags >> 6, pts); q += 5; } if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { write_pts(q, 1, dts); q += 5; } if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) { flags = 0x01; /* set PES_extension_flag_2 */ *q++ = flags; *q++ = 0x80 | 0x01; /* marker bit + extension length */ /* * Set the stream id extension flag bit to 0 and * write the extended stream id */ *q++ = 0x00 | 0x60; } if (private_code != 0) *q++ = private_code; is_start = 0; } /* header size */ header_len = q - buf; /* data len */ len = TS_PACKET_SIZE - header_len; if (len > payload_size) len = payload_size; stuffing_len = TS_PACKET_SIZE - header_len - len; if (stuffing_len > 0) { /* add stuffing with AFC */ if (buf[3] & 0x20) { /* stuffing already present: increase its size */ afc_len = buf[4] + 1; memmove(buf + 4 + afc_len + stuffing_len, buf + 4 + afc_len, header_len - (4 + afc_len)); buf[4] += stuffing_len; memset(buf + 4 + afc_len, 0xff, stuffing_len); } else { /* add stuffing */ memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); buf[3] |= 0x20; buf[4] = stuffing_len - 1; if (stuffing_len >= 2) { buf[5] = 0x00; memset(buf + 6, 0xff, stuffing_len - 2); } } } memcpy(buf + TS_PACKET_SIZE - len, payload, len); payload += len; payload_size -= len; avio_write(s->pb, buf, TS_PACKET_SIZE); } avio_flush(s->pb); } static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt) { AVStream *st = s->streams[pkt->stream_index]; int size = pkt->size; uint8_t *buf= pkt->data; uint8_t *data= NULL; MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st = st->priv_data; const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2; int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; if (ts->reemit_pat_pmt) { av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n"); ts->reemit_pat_pmt = 0; ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT; } if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) { ts->pat_packet_count = ts->pat_packet_period - 1; ts->sdt_packet_count = ts->sdt_packet_period - 1; ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT; } if (pkt->pts != AV_NOPTS_VALUE) pts = pkt->pts + delay; if (pkt->dts != AV_NOPTS_VALUE) dts = pkt->dts + delay; if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { av_log(s, AV_LOG_ERROR, "first pts value must set\n"); return AVERROR(EINVAL); } ts_st->first_pts_check = 0; if (st->codec->codec_id == AV_CODEC_ID_H264) { const uint8_t *p = buf, *buf_end = p+size; uint32_t state = -1; if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, " "no startcode found, use -bsf h264_mp4toannexb\n"); return AVERROR(EINVAL); } do { p = avpriv_mpv_find_start_code(p, buf_end, &state); av_dlog(s, "nal %d\n", state & 0x1f); } while (p < buf_end && (state & 0x1f) != 9 && (state & 0x1f) != 5 && (state & 0x1f) != 1); if ((state & 0x1f) != 9) { // AUD NAL data = av_malloc(pkt->size+6); if (!data) return AVERROR(ENOMEM); memcpy(data+6, pkt->data, pkt->size); AV_WB32(data, 0x00000001); data[4] = 0x09; data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit buf = data; size = pkt->size+6; } } else if (st->codec->codec_id == AV_CODEC_ID_AAC) { if (pkt->size < 2) { av_log(s, AV_LOG_ERROR, "AAC packet too short\n"); return AVERROR(EINVAL); } if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) { int ret; AVPacket pkt2; if (!ts_st->amux) { av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format " "and extradata missing\n"); return AVERROR(EINVAL); } av_init_packet(&pkt2); pkt2.data = pkt->data; pkt2.size = pkt->size; ret = avio_open_dyn_buf(&ts_st->amux->pb); if (ret < 0) return AVERROR(ENOMEM); ret = av_write_frame(ts_st->amux, &pkt2); if (ret < 0) { avio_close_dyn_buf(ts_st->amux->pb, &data); ts_st->amux->pb = NULL; av_free(data); return ret; } size = avio_close_dyn_buf(ts_st->amux->pb, &data); ts_st->amux->pb = NULL; buf = data; } } if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) { // for video and subtitle, write a single pes packet mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY); av_free(data); return 0; } if (ts_st->payload_size + size > ts->pes_payload_size) { if (ts_st->payload_size) { mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size, ts_st->payload_pts, ts_st->payload_dts, ts_st->payload_flags & AV_PKT_FLAG_KEY); ts_st->payload_size = 0; } if (size > ts->pes_payload_size) { mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY); av_free(data); return 0; } } if (!ts_st->payload_size) { ts_st->payload_pts = pts; ts_st->payload_dts = dts; ts_st->payload_flags = pkt->flags; } memcpy(ts_st->payload + ts_st->payload_size, buf, size); ts_st->payload_size += size; av_free(data); return 0; } static void mpegts_write_flush(AVFormatContext *s) { int i; /* flush current packets */ for(i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *ts_st = st->priv_data; if (ts_st->payload_size > 0) { mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size, ts_st->payload_pts, ts_st->payload_dts, ts_st->payload_flags & AV_PKT_FLAG_KEY); ts_st->payload_size = 0; } } avio_flush(s->pb); } static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) { if (!pkt) { mpegts_write_flush(s); return 1; } else { return mpegts_write_packet_internal(s, pkt); } } static int mpegts_write_end(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; int i; mpegts_write_flush(s); for(i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *ts_st = st->priv_data; av_freep(&ts_st->payload); if (ts_st->amux) { avformat_free_context(ts_st->amux); ts_st->amux = NULL; } } for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; av_freep(&service->provider_name); av_freep(&service->name); av_free(service); } av_free(ts->services); return 0; } AVOutputFormat ff_mpegts_muxer = { .name = "mpegts", .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"), .mime_type = "video/x-mpegts", .extensions = "ts,m2t", .priv_data_size = sizeof(MpegTSWrite), .audio_codec = AV_CODEC_ID_MP2, .video_codec = AV_CODEC_ID_MPEG2VIDEO, .write_header = mpegts_write_header, .write_packet = mpegts_write_packet, .write_trailer = mpegts_write_end, .flags = AVFMT_ALLOW_FLUSH, .priv_class = &mpegts_muxer_class, };