/* * MPEG-2 transport stream (aka DVB) muxer * Copyright (c) 2003 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/avassert.h" #include "libavutil/bswap.h" #include "libavutil/crc.h" #include "libavutil/dict.h" #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "libavutil/opt.h" #include "libavcodec/internal.h" #include "avformat.h" #include "avio_internal.h" #include "internal.h" #include "mpegts.h" #define PCR_TIME_BASE 27000000 /* write DVB SI sections */ #define DVB_PRIVATE_NETWORK_START 0xff01 /*********************************************/ /* mpegts section writer */ typedef struct MpegTSSection { int pid; int cc; int discontinuity; void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); void *opaque; } MpegTSSection; typedef struct MpegTSService { MpegTSSection pmt; /* MPEG-2 PMT table context */ int sid; /* service ID */ uint8_t name[256]; uint8_t provider_name[256]; int pcr_pid; AVProgram *program; } MpegTSService; // service_type values as defined in ETSI 300 468 enum { MPEGTS_SERVICE_TYPE_DIGITAL_TV = 0x01, MPEGTS_SERVICE_TYPE_DIGITAL_RADIO = 0x02, MPEGTS_SERVICE_TYPE_TELETEXT = 0x03, MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_RADIO = 0x0A, MPEGTS_SERVICE_TYPE_MPEG2_DIGITAL_HDTV = 0x11, MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_SDTV = 0x16, MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_HDTV = 0x19, MPEGTS_SERVICE_TYPE_HEVC_DIGITAL_HDTV = 0x1F, }; typedef struct MpegTSWrite { const AVClass *av_class; MpegTSSection pat; /* MPEG-2 PAT table */ MpegTSSection sdt; /* MPEG-2 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; int64_t next_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 service_type; int pmt_start_pid; int start_pid; int m2ts_mode; int pcr_period; #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01 #define MPEGTS_FLAG_AAC_LATM 0x02 #define MPEGTS_FLAG_PAT_PMT_AT_FRAMES 0x04 #define MPEGTS_FLAG_SYSTEM_B 0x08 #define MPEGTS_FLAG_DISCONT 0x10 int flags; int copyts; int tables_version; double pat_period; double sdt_period; int64_t last_pat_ts; int64_t last_sdt_ts; int omit_video_pes_length; } 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) /* The section length is 12 bits. The first 2 are set to 0, the remaining * 10 bits should not exceed 1021. */ #define SECTION_LENGTH 1020 /* 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 (s->discontinuity) { q[-1] |= 0x20; *q++ = 1; *q++ = 0x80; s->discontinuity = 0; } 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 AVERROR_INVALIDDATA; 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 "FFmpeg" #define DEFAULT_SERVICE_NAME "Service" /* 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 { int pid; /* stream associated pid */ int cc; int discontinuity; int payload_size; int first_pts_check; ///< first pts check needed int prev_payload_key; int64_t payload_pts; int64_t payload_dts; int payload_flags; uint8_t *payload; AVFormatContext *amux; int64_t pcr_period; /* PCR period in PCR time base */ int64_t last_pcr; /* For Opus */ int opus_queued_samples; int opus_pending_trim_start; } MpegTSWriteStream; static void mpegts_write_pat(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[SECTION_LENGTH], *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, ts->tables_version, 0, 0, data, q - data); } static void putbuf(uint8_t **q_ptr, const uint8_t *buf, size_t len) { memcpy(*q_ptr, buf, len); *q_ptr += len; } static void put_registration_descriptor(uint8_t **q_ptr, uint32_t tag) { uint8_t *q = *q_ptr; *q++ = 0x05; /* MPEG-2 registration descriptor*/ *q++ = 4; *q++ = tag; *q++ = tag >> 8; *q++ = tag >> 16; *q++ = tag >> 24; *q_ptr = q; } static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) { MpegTSWrite *ts = s->priv_data; uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr; int val, stream_type, i, err = 0; 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); if (s->nb_programs) { int k, found = 0; AVProgram *program = service->program; for (k = 0; k < program->nb_stream_indexes; k++) if (program->stream_index[k] == i) { found = 1; break; } if (!found) continue; } if (q - data > SECTION_LENGTH - 32) { err = 1; break; } switch (st->codecpar->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_HEVC: stream_type = STREAM_TYPE_VIDEO_HEVC; 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_VC1: stream_type = STREAM_TYPE_VIDEO_VC1; break; case AV_CODEC_ID_MP2: case AV_CODEC_ID_MP3: if ( st->codecpar->sample_rate > 0 && st->codecpar->sample_rate < 32000) { stream_type = STREAM_TYPE_AUDIO_MPEG2; } else { 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 = (ts->flags & MPEGTS_FLAG_SYSTEM_B) ? STREAM_TYPE_PRIVATE_DATA : STREAM_TYPE_AUDIO_AC3; break; case AV_CODEC_ID_EAC3: stream_type = (ts->flags & MPEGTS_FLAG_SYSTEM_B) ? STREAM_TYPE_PRIVATE_DATA : STREAM_TYPE_AUDIO_EAC3; break; case AV_CODEC_ID_DTS: stream_type = STREAM_TYPE_AUDIO_DTS; break; case AV_CODEC_ID_TRUEHD: stream_type = STREAM_TYPE_AUDIO_TRUEHD; break; case AV_CODEC_ID_OPUS: stream_type = STREAM_TYPE_PRIVATE_DATA; break; case AV_CODEC_ID_TIMED_ID3: stream_type = STREAM_TYPE_METADATA; 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->codecpar->codec_type) { case AVMEDIA_TYPE_AUDIO: if (st->codecpar->codec_id==AV_CODEC_ID_AC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) { *q++=0x6a; // AC3 descriptor see A038 DVB SI *q++=1; // 1 byte, all flags sets to 0 *q++=0; // omit all fields... } if (st->codecpar->codec_id==AV_CODEC_ID_EAC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) { *q++=0x7a; // EAC3 descriptor see A038 DVB SI *q++=1; // 1 byte, all flags sets to 0 *q++=0; // omit all fields... } if (st->codecpar->codec_id==AV_CODEC_ID_S302M) put_registration_descriptor(&q, MKTAG('B', 'S', 'S', 'D')); if (st->codecpar->codec_id==AV_CODEC_ID_OPUS) { /* 6 bytes registration descriptor, 4 bytes Opus audio descriptor */ if (q - data > SECTION_LENGTH - 6 - 4) { err = 1; break; } put_registration_descriptor(&q, MKTAG('O', 'p', 'u', 's')); *q++ = 0x7f; /* DVB extension descriptor */ *q++ = 2; *q++ = 0x80; if (st->codecpar->extradata && st->codecpar->extradata_size >= 19) { if (st->codecpar->extradata[18] == 0 && st->codecpar->channels <= 2) { /* RTP mapping family */ *q++ = st->codecpar->channels; } else if (st->codecpar->extradata[18] == 1 && st->codecpar->channels <= 8 && st->codecpar->extradata_size >= 21 + st->codecpar->channels) { static const uint8_t coupled_stream_counts[9] = { 1, 0, 1, 1, 2, 2, 2, 3, 3 }; static const uint8_t channel_map_a[8][8] = { {0}, {0, 1}, {0, 2, 1}, {0, 1, 2, 3}, {0, 4, 1, 2, 3}, {0, 4, 1, 2, 3, 5}, {0, 4, 1, 2, 3, 5, 6}, {0, 6, 1, 2, 3, 4, 5, 7}, }; static const uint8_t channel_map_b[8][8] = { {0}, {0, 1}, {0, 1, 2}, {0, 1, 2, 3}, {0, 1, 2, 3, 4}, {0, 1, 2, 3, 4, 5}, {0, 1, 2, 3, 4, 5, 6}, {0, 1, 2, 3, 4, 5, 6, 7}, }; /* Vorbis mapping family */ if (st->codecpar->extradata[19] == st->codecpar->channels - coupled_stream_counts[st->codecpar->channels] && st->codecpar->extradata[20] == coupled_stream_counts[st->codecpar->channels] && memcmp(&st->codecpar->extradata[21], channel_map_a[st->codecpar->channels-1], st->codecpar->channels) == 0) { *q++ = st->codecpar->channels; } else if (st->codecpar->channels >= 2 && st->codecpar->extradata[19] == st->codecpar->channels && st->codecpar->extradata[20] == 0 && memcmp(&st->codecpar->extradata[21], channel_map_b[st->codecpar->channels-1], st->codecpar->channels) == 0) { *q++ = st->codecpar->channels | 0x80; } else { /* Unsupported, could write an extended descriptor here */ av_log(s, AV_LOG_ERROR, "Unsupported Opus Vorbis-style channel mapping"); *q++ = 0xff; } } else { /* Unsupported */ av_log(s, AV_LOG_ERROR, "Unsupported Opus channel mapping for family %d", st->codecpar->extradata[18]); *q++ = 0xff; } } else if (st->codecpar->channels <= 2) { /* Assume RTP mapping family */ *q++ = st->codecpar->channels; } else { /* Unsupported */ av_log(s, AV_LOG_ERROR, "Unsupported Opus channel mapping"); *q++ = 0xff; } } 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) { if (q - data > SECTION_LENGTH - 4) { err = 1; break; } 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 default_language[] = "und"; const char *language = lang && strlen(lang->value) >= 3 ? lang->value : default_language; if (st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE) { uint8_t *len_ptr; int extradata_copied = 0; *q++ = 0x59; /* subtitling_descriptor */ len_ptr = q++; while (strlen(language) >= 3) { if (sizeof(data) - (q - data) < 8) { /* 8 bytes per DVB subtitle substream data */ err = 1; break; } *q++ = *language++; *q++ = *language++; *q++ = *language++; /* Skip comma */ if (*language != '\0') language++; if (st->codecpar->extradata_size - extradata_copied >= 5) { *q++ = st->codecpar->extradata[extradata_copied + 4]; /* subtitling_type */ memcpy(q, st->codecpar->extradata + extradata_copied, 4); /* composition_page_id and ancillary_page_id */ extradata_copied += 5; q += 4; } else { /* subtitling_type: * 0x10 - normal with no monitor aspect ratio criticality * 0x20 - for the hard of hearing with no monitor aspect ratio criticality */ *q++ = (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) ? 0x20 : 0x10; if ((st->codecpar->extradata_size == 4) && (extradata_copied == 0)) { /* support of old 4-byte extradata format */ memcpy(q, st->codecpar->extradata, 4); /* composition_page_id and ancillary_page_id */ extradata_copied += 4; q += 4; } else { put16(&q, 1); /* composition_page_id */ put16(&q, 1); /* ancillary_page_id */ } } } *len_ptr = q - len_ptr - 1; } else if (st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT) { uint8_t *len_ptr = NULL; int extradata_copied = 0; /* The descriptor tag. teletext_descriptor */ *q++ = 0x56; len_ptr = q++; while (strlen(language) >= 3 && q - data < sizeof(data) - 6) { *q++ = *language++; *q++ = *language++; *q++ = *language++; /* Skip comma */ if (*language != '\0') language++; if (st->codecpar->extradata_size - 1 > extradata_copied) { memcpy(q, st->codecpar->extradata + extradata_copied, 2); extradata_copied += 2; q += 2; } else { /* The Teletext descriptor: * teletext_type: This 5-bit field indicates the type of Teletext page indicated. (0x01 Initial Teletext page) * teletext_magazine_number: This is a 3-bit field which identifies the magazine number. * teletext_page_number: This is an 8-bit field giving two 4-bit hex digits identifying the page number. */ *q++ = 0x08; *q++ = 0x00; } } *len_ptr = q - len_ptr - 1; } } break; case AVMEDIA_TYPE_VIDEO: if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { put_registration_descriptor(&q, MKTAG('d', 'r', 'a', 'c')); } else if (stream_type == STREAM_TYPE_VIDEO_VC1) { put_registration_descriptor(&q, MKTAG('V', 'C', '-', '1')); } else if (stream_type == STREAM_TYPE_VIDEO_HEVC && s->strict_std_compliance <= FF_COMPLIANCE_NORMAL) { put_registration_descriptor(&q, MKTAG('H', 'E', 'V', 'C')); } break; case AVMEDIA_TYPE_DATA: if (st->codecpar->codec_id == AV_CODEC_ID_SMPTE_KLV) { put_registration_descriptor(&q, MKTAG('K', 'L', 'V', 'A')); } else if (st->codecpar->codec_id == AV_CODEC_ID_TIMED_ID3) { const char *tag = "ID3 "; *q++ = 0x26; /* metadata descriptor */ *q++ = 13; put16(&q, 0xffff); /* metadata application format */ putbuf(&q, tag, strlen(tag)); *q++ = 0xff; /* metadata format */ putbuf(&q, tag, strlen(tag)); *q++ = 0; /* metadata service ID */ *q++ = 0xF; /* metadata_locator_record_flag|MPEG_carriage_flags|reserved */ } break; } val = 0xf000 | (q - desc_length_ptr - 2); desc_length_ptr[0] = val >> 8; desc_length_ptr[1] = val; } if (err) av_log(s, AV_LOG_ERROR, "The PMT section cannot fit stream %d and all following streams.\n" "Try reducing the number of languages in the audio streams " "or the total number of streams.\n", i); mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0, data, q - data); return 0; } static void mpegts_write_sdt(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[SECTION_LENGTH], *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++ = ts->service_type; putbuf(&q, service->provider_name, service->provider_name[0] + 1); putbuf(&q, service->name, service->name[0] + 1); 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, ts->tables_version, 0, 0, data, q - data); } /* This stores a string in buf with the correct encoding and also sets the * first byte as the length. !str is accepted for an empty string. * If the string is already encoded, invalid UTF-8 or has no multibyte sequence * then we keep it as is, otherwise we signal UTF-8 encoding. */ static int encode_str8(uint8_t *buf, const char *str) { size_t str_len; if (!str) str = ""; str_len = strlen(str); if (str[0] && (unsigned)str[0] >= 0x20) { /* Make sure the string is not already encoded. */ const uint8_t *q = str; int has_multibyte = 0; while (*q) { uint32_t code; GET_UTF8(code, *q++, goto invalid;) /* Is it valid UTF-8? */ has_multibyte |= (code > 127); /* Does it have multibyte UTF-8 chars in it? */ } if (has_multibyte) { /* If we have multibyte chars and valid UTF-8, then encode as such! */ if (str_len > 254) return AVERROR(EINVAL); buf[0] = str_len + 1; buf[1] = 0x15; memcpy(&buf[2], str, str_len); return 0; } } invalid: /* Otherwise let's just encode the string as is! */ if (str_len > 255) return AVERROR(EINVAL); buf[0] = str_len; memcpy(&buf[1], str, str_len); return 0; } 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 void mpegts_prefix_m2ts_header(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; if (ts->m2ts_mode) { int64_t pcr = get_pcr(s->priv_data, s->pb); uint32_t tp_extra_header = pcr % 0x3fffffff; tp_extra_header = AV_RB32(&tp_extra_header); avio_write(s->pb, (unsigned char *) &tp_extra_header, sizeof(tp_extra_header)); } } static void section_write_packet(MpegTSSection *s, const uint8_t *packet) { AVFormatContext *ctx = s->opaque; mpegts_prefix_m2ts_header(ctx); avio_write(ctx->pb, packet, TS_PACKET_SIZE); } static MpegTSService *mpegts_add_service(AVFormatContext *s, int sid, const AVDictionary *metadata, AVProgram *program) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; AVDictionaryEntry *title, *provider; char default_service_name[32]; const char *service_name; const char *provider_name; title = av_dict_get(metadata, "service_name", NULL, 0); if (!title) title = av_dict_get(metadata, "title", NULL, 0); snprintf(default_service_name, sizeof(default_service_name), "%s%02d", DEFAULT_SERVICE_NAME, ts->nb_services + 1); service_name = title ? title->value : default_service_name; provider = av_dict_get(metadata, "service_provider", NULL, 0); provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME; service = av_mallocz(sizeof(MpegTSService)); if (!service) return NULL; service->pmt.pid = ts->pmt_start_pid + ts->nb_services; service->sid = sid; service->pcr_pid = 0x1fff; if (encode_str8(service->provider_name, provider_name) < 0 || encode_str8(service->name, service_name) < 0) { av_log(s, AV_LOG_ERROR, "Too long service or provider name\n"); goto fail; } if (av_dynarray_add_nofree(&ts->services, &ts->nb_services, service) < 0) goto fail; service->pmt.write_packet = section_write_packet; service->pmt.opaque = s; service->pmt.cc = 15; service->pmt.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT; service->program = program; return service; fail: av_free(service); return NULL; } static void enable_pcr_generation_for_stream(AVFormatContext *s, AVStream *pcr_st) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st = pcr_st->priv_data; if (ts->mux_rate > 1) { ts_st->pcr_period = av_rescale(ts->pcr_period, PCR_TIME_BASE, 1000); } else { /* For VBR we select the highest multiple of frame duration which is less than 100 ms. */ int64_t frame_period = 0; if (pcr_st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) { int frame_size = av_get_audio_frame_duration2(pcr_st->codecpar, 0); if (!frame_size) { av_log(s, AV_LOG_WARNING, "frame size not set\n"); frame_size = 512; } frame_period = av_rescale_rnd(frame_size, PCR_TIME_BASE, pcr_st->codecpar->sample_rate, AV_ROUND_UP); } else if (pcr_st->avg_frame_rate.num) { frame_period = av_rescale_rnd(pcr_st->avg_frame_rate.den, PCR_TIME_BASE, pcr_st->avg_frame_rate.num, AV_ROUND_UP); } if (frame_period > 0 && frame_period <= PCR_TIME_BASE / 10) ts_st->pcr_period = frame_period * (PCR_TIME_BASE / 10 / frame_period); else ts_st->pcr_period = 1; } // output a PCR as soon as possible ts_st->last_pcr = ts->first_pcr - ts_st->pcr_period; } static void select_pcr_streams(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; for (int i = 0; i < ts->nb_services; i++) { MpegTSService *service = ts->services[i]; AVStream *pcr_st = NULL; AVProgram *program = service->program; int nb_streams = program ? program->nb_stream_indexes : s->nb_streams; for (int j = 0; j < nb_streams; j++) { AVStream *st = s->streams[program ? program->stream_index[j] : j]; if (!pcr_st || pcr_st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { pcr_st = st; } } if (pcr_st) { MpegTSWriteStream *ts_st = pcr_st->priv_data; service->pcr_pid = ts_st->pid; enable_pcr_generation_for_stream(s, pcr_st); av_log(s, AV_LOG_VERBOSE, "service %i using PCR in pid=%i, pcr_period=%"PRId64"ms\n", service->sid, service->pcr_pid, av_rescale(ts_st->pcr_period, 1000, PCR_TIME_BASE)); } } } static int mpegts_init(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; int i, j; 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; if (!s->nb_programs) { /* allocate a single DVB service */ if (!mpegts_add_service(s, ts->service_id, s->metadata, NULL)) return AVERROR(ENOMEM); } else { for (i = 0; i < s->nb_programs; i++) { AVProgram *program = s->programs[i]; if (!mpegts_add_service(s, program->id, program->metadata, program)) return AVERROR(ENOMEM); } } ts->pat.pid = PAT_PID; /* Initialize at 15 so that it wraps and is equal to 0 for the * first packet we write. */ ts->pat.cc = 15; ts->pat.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT; ts->pat.write_packet = section_write_packet; ts->pat.opaque = s; ts->sdt.pid = SDT_PID; ts->sdt.cc = 15; ts->sdt.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT; ts->sdt.write_packet = section_write_packet; ts->sdt.opaque = s; pids = av_malloc_array(s->nb_streams, sizeof(*pids)); if (!pids) { ret = AVERROR(ENOMEM); goto fail; } /* assign pids to each stream */ for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *ts_st; ts_st = av_mallocz(sizeof(MpegTSWriteStream)); if (!ts_st) { ret = AVERROR(ENOMEM); goto fail; } st->priv_data = ts_st; avpriv_set_pts_info(st, 33, 1, 90000); ts_st->payload = av_mallocz(ts->pes_payload_size); if (!ts_st->payload) { ret = AVERROR(ENOMEM); goto fail; } /* 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; } for (j = 0; j < ts->nb_services; j++) { if (ts_st->pid == ts->services[j]->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; ts_st->discontinuity = ts->flags & MPEGTS_FLAG_DISCONT; if (st->codecpar->codec_id == AV_CODEC_ID_AAC && st->codecpar->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; } if (!(ast = avformat_new_stream(ts_st->amux, NULL))) { ret = AVERROR(ENOMEM); goto fail; } ret = avcodec_parameters_copy(ast->codecpar, st->codecpar); if (ret != 0) goto fail; ast->time_base = st->time_base; ret = avformat_write_header(ts_st->amux, NULL); if (ret < 0) goto fail; } if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) { ts_st->opus_pending_trim_start = st->codecpar->initial_padding * 48000 / st->codecpar->sample_rate; } } av_freep(&pids); if (ts->mux_rate > 1) { ts->sdt_packet_period = (int64_t)ts->mux_rate * SDT_RETRANS_TIME / (TS_PACKET_SIZE * 8 * 1000); ts->pat_packet_period = (int64_t)ts->mux_rate * PAT_RETRANS_TIME / (TS_PACKET_SIZE * 8 * 1000); } else { /* Arbitrary values, PAT/PMT will also be written on video key frames */ ts->sdt_packet_period = 200; ts->pat_packet_period = 40; } if (ts->copyts < 1) ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE); select_pcr_streams(s); ts->last_pat_ts = AV_NOPTS_VALUE; ts->last_sdt_ts = AV_NOPTS_VALUE; // The user specified a period, use only it if (ts->pat_period < INT_MAX/2) { ts->pat_packet_period = INT_MAX; } if (ts->sdt_period < INT_MAX/2) { ts->sdt_packet_period = INT_MAX; } 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, "sdt every %d, pat/pmt every %d pkts\n", ts->sdt_packet_period, ts->pat_packet_period); if (ts->m2ts_mode == -1) { if (av_match_ext(s->url, "m2ts")) { ts->m2ts_mode = 1; } else { ts->m2ts_mode = 0; } } return 0; fail: av_freep(&pids); return ret; } /* send SDT, PAT and PMT tables regularly */ static void retransmit_si_info(AVFormatContext *s, int force_pat, int64_t dts) { MpegTSWrite *ts = s->priv_data; int i; if (++ts->sdt_packet_count == ts->sdt_packet_period || (dts != AV_NOPTS_VALUE && ts->last_sdt_ts == AV_NOPTS_VALUE) || (dts != AV_NOPTS_VALUE && dts - ts->last_sdt_ts >= ts->sdt_period*90000.0) ) { ts->sdt_packet_count = 0; if (dts != AV_NOPTS_VALUE) ts->last_sdt_ts = FFMAX(dts, ts->last_sdt_ts); mpegts_write_sdt(s); } if (++ts->pat_packet_count == ts->pat_packet_period || (dts != AV_NOPTS_VALUE && ts->last_pat_ts == AV_NOPTS_VALUE) || (dts != AV_NOPTS_VALUE && dts - ts->last_pat_ts >= ts->pat_period*90000.0) || force_pat) { ts->pat_packet_count = 0; if (dts != AV_NOPTS_VALUE) ts->last_pat_ts = FFMAX(dts, ts->last_pat_ts); mpegts_write_pat(s); for (i = 0; i < ts->nb_services; i++) mpegts_write_pmt(s, ts->services[i]); } } 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)); mpegts_prefix_m2ts_header(s); 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 */ if (ts_st->discontinuity) { q[-1] |= 0x80; ts_st->discontinuity = 0; } /* 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)); mpegts_prefix_m2ts_header(s); 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 av_assert0(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 av_assert0(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 the payload, and segment into an integer * number of TS packets. The final TS packet is padded using an oversized * 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, int stream_id) { 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, is_dvb_subtitle, is_dvb_teletext, flags; int afc_len, stuffing_len; int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); int force_pat = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key; av_assert0(ts_st->payload != buf || st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO); if (ts->flags & MPEGTS_FLAG_PAT_PMT_AT_FRAMES && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { force_pat = 1; } is_start = 1; while (payload_size > 0) { int64_t pcr = -1; /* avoid warning */ retransmit_si_info(s, force_pat, dts); force_pat = 0; write_pcr = 0; if (ts->mux_rate > 1) { /* Send PCR packets for all PCR streams if needed */ pcr = get_pcr(ts, s->pb); if (pcr >= ts->next_pcr) { int64_t next_pcr = INT64_MAX; for (int i = 0; i < s->nb_streams; i++) { /* Make the current stream the last, because for that we * can insert the pcr into the payload later */ int st2_index = i < st->index ? i : (i + 1 == s->nb_streams ? st->index : i + 1); AVStream *st2 = s->streams[st2_index]; MpegTSWriteStream *ts_st2 = st2->priv_data; if (ts_st2->pcr_period) { if (pcr - ts_st2->last_pcr >= ts_st2->pcr_period) { ts_st2->last_pcr = FFMAX(pcr - ts_st2->pcr_period, ts_st2->last_pcr + ts_st2->pcr_period); if (st2 != st) { mpegts_insert_pcr_only(s, st2); pcr = get_pcr(ts, s->pb); } else { write_pcr = 1; } } next_pcr = FFMIN(next_pcr, ts_st2->last_pcr + ts_st2->pcr_period); } } ts->next_pcr = next_pcr; } } else if (ts_st->pcr_period && dts != AV_NOPTS_VALUE) { pcr = (dts - delay) * 300; if (pcr - ts_st->last_pcr >= ts_st->pcr_period && is_start) { ts_st->last_pcr = FFMAX(pcr - ts_st->pcr_period, ts_st->last_pcr + ts_st->pcr_period); 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); /* recalculate write_pcr and possibly retransmit si_info */ continue; } /* 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 (ts_st->discontinuity) { set_af_flag(buf, 0x80); q = get_ts_payload_start(buf); ts_st->discontinuity = 0; } if (key && is_start && pts != AV_NOPTS_VALUE) { // set Random Access for key frames if (ts_st->pcr_period) 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 (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; int pes_header_stuffing_bytes = 0; /* write PES header */ *q++ = 0x00; *q++ = 0x00; *q++ = 0x01; is_dvb_subtitle = 0; is_dvb_teletext = 0; if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC) *q++ = 0xfd; else *q++ = 0xe0; } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && (st->codecpar->codec_id == AV_CODEC_ID_MP2 || st->codecpar->codec_id == AV_CODEC_ID_MP3 || st->codecpar->codec_id == AV_CODEC_ID_AAC)) { *q++ = 0xc0; } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->codec_id == AV_CODEC_ID_AC3 && ts->m2ts_mode) { *q++ = 0xfd; } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA && st->codecpar->codec_id == AV_CODEC_ID_TIMED_ID3) { *q++ = 0xbd; } else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA) { *q++ = stream_id != -1 ? stream_id : 0xfc; if (stream_id == 0xbd) /* asynchronous KLV */ pts = dts = AV_NOPTS_VALUE; } else { *q++ = 0xbd; if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) { if (st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE) { is_dvb_subtitle = 1; } else if (st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT) { is_dvb_teletext = 1; } } } 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->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->codecpar->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; } /* for Blu-ray AC3 Audio the PES Extension flag should be as follow * otherwise it will not play sound on blu-ray */ if (ts->m2ts_mode && st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->codec_id == AV_CODEC_ID_AC3) { /* set PES_extension_flag */ pes_extension = 1; flags |= 0x01; header_len += 3; } if (is_dvb_teletext) { pes_header_stuffing_bytes = 0x24 - header_len; header_len = 0x24; } len = payload_size + header_len + 3; /* 3 extra bytes should be added to DVB subtitle payload: 0x20 0x00 at the beginning and trailing 0xff */ if (is_dvb_subtitle) { len += 3; payload_size++; } if (len > 0xffff) len = 0; if (ts->omit_video_pes_length && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { len = 0; } *q++ = len >> 8; *q++ = len; val = 0x80; /* data alignment indicator is required for subtitle and data streams */ if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codecpar->codec_type == AVMEDIA_TYPE_DATA) 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->codecpar->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; } /* For Blu-ray AC3 Audio Setting extended flags */ if (ts->m2ts_mode && pes_extension && st->codecpar->codec_id == AV_CODEC_ID_AC3) { flags = 0x01; /* set PES_extension_flag_2 */ *q++ = flags; *q++ = 0x80 | 0x01; /* marker bit + extension length */ *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */ } if (is_dvb_subtitle) { /* First two fields of DVB subtitles PES data: * data_identifier: for DVB subtitle streams shall be coded with the value 0x20 * subtitle_stream_id: for DVB subtitle stream shall be identified by the value 0x00 */ *q++ = 0x20; *q++ = 0x00; } if (is_dvb_teletext) { memset(q, 0xff, pes_header_stuffing_bytes); q += pes_header_stuffing_bytes; } 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); } } } if (is_dvb_subtitle && payload_size == len) { memcpy(buf + TS_PACKET_SIZE - len, payload, len - 1); buf[TS_PACKET_SIZE - 1] = 0xff; /* end_of_PES_data_field_marker: an 8-bit field with fixed contents 0xff for DVB subtitle */ } else { memcpy(buf + TS_PACKET_SIZE - len, payload, len); } payload += len; payload_size -= len; mpegts_prefix_m2ts_header(s); avio_write(s->pb, buf, TS_PACKET_SIZE); } ts_st->prev_payload_key = key; } int ff_check_h264_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt) { if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001 && AV_RB24(pkt->data) != 0x000001) { if (!st->nb_frames) { av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, " "no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it " "('-bsf:v h264_mp4toannexb' option with ffmpeg)\n"); return AVERROR_INVALIDDATA; } av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing, size %d", pkt->size); if (pkt->size) av_log(s, AV_LOG_WARNING, " data %08"PRIX32, AV_RB32(pkt->data)); av_log(s, AV_LOG_WARNING, "\n"); } return 0; } static int check_hevc_startcode(AVFormatContext *s, const AVStream *st, const AVPacket *pkt) { if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001 && AV_RB24(pkt->data) != 0x000001) { if (!st->nb_frames) { av_log(s, AV_LOG_ERROR, "HEVC bitstream malformed, no startcode found\n"); return AVERROR_PATCHWELCOME; } av_log(s, AV_LOG_WARNING, "HEVC bitstream error, startcode missing, size %d", pkt->size); if (pkt->size) av_log(s, AV_LOG_WARNING, " data %08"PRIX32, AV_RB32(pkt->data)); av_log(s, AV_LOG_WARNING, "\n"); } return 0; } /* Based on GStreamer's gst-plugins-base/ext/ogg/gstoggstream.c * Released under the LGPL v2.1+, written by * Vincent Penquerc'h */ static int opus_get_packet_samples(AVFormatContext *s, AVPacket *pkt) { static const int durations[32] = { 480, 960, 1920, 2880, /* Silk NB */ 480, 960, 1920, 2880, /* Silk MB */ 480, 960, 1920, 2880, /* Silk WB */ 480, 960, /* Hybrid SWB */ 480, 960, /* Hybrid FB */ 120, 240, 480, 960, /* CELT NB */ 120, 240, 480, 960, /* CELT NB */ 120, 240, 480, 960, /* CELT NB */ 120, 240, 480, 960, /* CELT NB */ }; int toc, frame_duration, nframes, duration; if (pkt->size < 1) return 0; toc = pkt->data[0]; frame_duration = durations[toc >> 3]; switch (toc & 3) { case 0: nframes = 1; break; case 1: nframes = 2; break; case 2: nframes = 2; break; case 3: if (pkt->size < 2) return 0; nframes = pkt->data[1] & 63; break; } duration = nframes * frame_duration; if (duration > 5760) { av_log(s, AV_LOG_WARNING, "Opus packet duration > 120 ms, invalid"); return 0; } return duration; } 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 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2; int64_t dts = pkt->dts, pts = pkt->pts; int opus_samples = 0; int side_data_size; uint8_t *side_data = NULL; int stream_id = -1; side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, &side_data_size); if (side_data) stream_id = side_data[0]; 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 (ts->copyts < 1) { if (pts != AV_NOPTS_VALUE) pts += delay; if (dts != AV_NOPTS_VALUE) dts += delay; } if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { av_log(s, AV_LOG_ERROR, "first pts value must be set\n"); return AVERROR_INVALIDDATA; } ts_st->first_pts_check = 0; if (st->codecpar->codec_id == AV_CODEC_ID_H264) { const uint8_t *p = buf, *buf_end = p + size; uint32_t state = -1; int extradd = (pkt->flags & AV_PKT_FLAG_KEY) ? st->codecpar->extradata_size : 0; int ret = ff_check_h264_startcode(s, st, pkt); if (ret < 0) return ret; if (extradd && AV_RB24(st->codecpar->extradata) > 1) extradd = 0; do { p = avpriv_find_start_code(p, buf_end, &state); av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", state & 0x1f); if ((state & 0x1f) == 7) extradd = 0; } while (p < buf_end && (state & 0x1f) != 9 && (state & 0x1f) != 5 && (state & 0x1f) != 1); if ((state & 0x1f) != 5) extradd = 0; if ((state & 0x1f) != 9) { // AUD NAL data = av_malloc(pkt->size + 6 + extradd); if (!data) return AVERROR(ENOMEM); memcpy(data + 6, st->codecpar->extradata, extradd); memcpy(data + 6 + extradd, 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 + extradd; } } else if (st->codecpar->codec_id == AV_CODEC_ID_AAC) { if (pkt->size < 2) { av_log(s, AV_LOG_ERROR, "AAC packet too short\n"); return AVERROR_INVALIDDATA; } 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"); } else { av_init_packet(&pkt2); pkt2.data = pkt->data; pkt2.size = pkt->size; av_assert0(pkt->dts != AV_NOPTS_VALUE); pkt2.dts = av_rescale_q(pkt->dts, st->time_base, ts_st->amux->streams[0]->time_base); 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) { ffio_free_dyn_buf(&ts_st->amux->pb); return ret; } size = avio_close_dyn_buf(ts_st->amux->pb, &data); ts_st->amux->pb = NULL; buf = data; } } } else if (st->codecpar->codec_id == AV_CODEC_ID_HEVC) { const uint8_t *p = buf, *buf_end = p + size; uint32_t state = -1; int extradd = (pkt->flags & AV_PKT_FLAG_KEY) ? st->codecpar->extradata_size : 0; int ret = check_hevc_startcode(s, st, pkt); if (ret < 0) return ret; if (extradd && AV_RB24(st->codecpar->extradata) > 1) extradd = 0; do { p = avpriv_find_start_code(p, buf_end, &state); av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", (state & 0x7e)>>1); if ((state & 0x7e) == 2*32) extradd = 0; } while (p < buf_end && (state & 0x7e) != 2*35 && (state & 0x7e) >= 2*32); if ((state & 0x7e) < 2*16 && (state & 0x7e) >= 2*24) extradd = 0; if ((state & 0x7e) != 2*35) { // AUD NAL data = av_malloc(pkt->size + 7 + extradd); if (!data) return AVERROR(ENOMEM); memcpy(data + 7, st->codecpar->extradata, extradd); memcpy(data + 7 + extradd, pkt->data, pkt->size); AV_WB32(data, 0x00000001); data[4] = 2*35; data[5] = 1; data[6] = 0x50; // any slice type (0x4) + rbsp stop one bit buf = data; size = pkt->size + 7 + extradd; } } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) { if (pkt->size < 2) { av_log(s, AV_LOG_ERROR, "Opus packet too short\n"); return AVERROR_INVALIDDATA; } /* Add Opus control header */ if ((AV_RB16(pkt->data) >> 5) != 0x3ff) { uint8_t *side_data; int side_data_size; int i, n; int ctrl_header_size; int trim_start = 0, trim_end = 0; opus_samples = opus_get_packet_samples(s, pkt); side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_data_size); if (side_data && side_data_size >= 10) { trim_end = AV_RL32(side_data + 4) * 48000 / st->codecpar->sample_rate; } ctrl_header_size = pkt->size + 2 + pkt->size / 255 + 1; if (ts_st->opus_pending_trim_start) ctrl_header_size += 2; if (trim_end) ctrl_header_size += 2; data = av_malloc(ctrl_header_size); if (!data) return AVERROR(ENOMEM); data[0] = 0x7f; data[1] = 0xe0; if (ts_st->opus_pending_trim_start) data[1] |= 0x10; if (trim_end) data[1] |= 0x08; n = pkt->size; i = 2; do { data[i] = FFMIN(n, 255); n -= 255; i++; } while (n >= 0); av_assert0(2 + pkt->size / 255 + 1 == i); if (ts_st->opus_pending_trim_start) { trim_start = FFMIN(ts_st->opus_pending_trim_start, opus_samples); AV_WB16(data + i, trim_start); i += 2; ts_st->opus_pending_trim_start -= trim_start; } if (trim_end) { trim_end = FFMIN(trim_end, opus_samples - trim_start); AV_WB16(data + i, trim_end); i += 2; } memcpy(data + i, pkt->data, pkt->size); buf = data; size = ctrl_header_size; } else { /* TODO: Can we get TS formatted data here? If so we will * need to count the samples of that too! */ av_log(s, AV_LOG_WARNING, "Got MPEG-TS formatted Opus data, unhandled"); } } if (pkt->dts != AV_NOPTS_VALUE) { int i; for(i=0; inb_streams; i++) { AVStream *st2 = s->streams[i]; MpegTSWriteStream *ts_st2 = st2->priv_data; if ( ts_st2->payload_size && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)) { mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size, ts_st2->payload_pts, ts_st2->payload_dts, ts_st2->payload_flags & AV_PKT_FLAG_KEY, stream_id); ts_st2->payload_size = 0; } } } if (ts_st->payload_size && (ts_st->payload_size + size > ts->pes_payload_size || (dts != AV_NOPTS_VALUE && ts_st->payload_dts != AV_NOPTS_VALUE && av_compare_ts(dts - ts_st->payload_dts, st->time_base, s->max_delay, AV_TIME_BASE_Q) >= 0) || ts_st->opus_queued_samples + opus_samples >= 5760 /* 120ms */)) { 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, stream_id); ts_st->payload_size = 0; ts_st->opus_queued_samples = 0; } if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) { av_assert0(!ts_st->payload_size); // for video and subtitle, write a single pes packet mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY, stream_id); ts_st->opus_queued_samples = 0; 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; ts_st->opus_queued_samples += opus_samples; 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, -1); ts_st->payload_size = 0; ts_st->opus_queued_samples = 0; } } } 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) { if (s->pb) mpegts_write_flush(s); return 0; } static void mpegts_deinit(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; int i; for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *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; } } } for (i = 0; i < ts->nb_services; i++) { service = ts->services[i]; av_freep(&service); } av_freep(&ts->services); } static int mpegts_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt) { int ret = 1; AVStream *st = s->streams[pkt->stream_index]; if (st->codecpar->codec_id == AV_CODEC_ID_H264) { if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 && (AV_RB24(pkt->data) != 0x000001 || (st->codecpar->extradata_size > 0 && st->codecpar->extradata[0] == 1))) ret = ff_stream_add_bitstream_filter(st, "h264_mp4toannexb", NULL); } else if (st->codecpar->codec_id == AV_CODEC_ID_HEVC) { if (pkt->size >= 5 && AV_RB32(pkt->data) != 0x0000001 && (AV_RB24(pkt->data) != 0x000001 || (st->codecpar->extradata_size > 0 && st->codecpar->extradata[0] == 1))) ret = ff_stream_add_bitstream_filter(st, "hevc_mp4toannexb", NULL); } return ret; } 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 = DVB_PRIVATE_NETWORK_START }, 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_service_type", "Set service_type field.", offsetof(MpegTSWrite, service_type), AV_OPT_TYPE_INT, { .i64 = 0x01 }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "digital_tv", "Digital Television.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_TV }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "digital_radio", "Digital Radio.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_RADIO }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "teletext", "Teletext.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_TELETEXT }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "advanced_codec_digital_radio", "Advanced Codec Digital Radio.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_RADIO }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "mpeg2_digital_hdtv", "MPEG2 Digital HDTV.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_MPEG2_DIGITAL_HDTV }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "advanced_codec_digital_sdtv", "Advanced Codec Digital SDTV.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_SDTV }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "advanced_codec_digital_hdtv", "Advanced Codec Digital HDTV.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_ADVANCED_CODEC_DIGITAL_HDTV }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "hevc_digital_hdtv", "HEVC Digital Television Service.", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_HEVC_DIGITAL_HDTV }, 0x01, 0xff, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_service_type" }, { "mpegts_pmt_start_pid", "Set the first pid of the PMT.", offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, { .i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM }, { "mpegts_start_pid", "Set the first pid.", offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, { .i64 = 0x0100 }, 0x0010, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM }, { "mpegts_m2ts_mode", "Enable m2ts mode.", offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, 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" }, { "pat_pmt_at_frames", "Reemit PAT and PMT at each video frame", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_PAT_PMT_AT_FRAMES}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" }, { "system_b", "Conform to System B (DVB) instead of System A (ATSC)", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_SYSTEM_B }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" }, { "initial_discontinuity", "Mark initial packets as discontinuous", 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_DISCONT }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" }, { "mpegts_copyts", "don't offset dts/pts", offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM }, { "tables_version", "set PAT, PMT and SDT version", offsetof(MpegTSWrite, tables_version), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 31, AV_OPT_FLAG_ENCODING_PARAM }, { "omit_video_pes_length", "Omit the PES packet length for video packets", offsetof(MpegTSWrite, omit_video_pes_length), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, { "pcr_period", "PCR retransmission time in milliseconds", offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT, { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, { "pat_period", "PAT/PMT retransmission time limit in seconds", offsetof(MpegTSWrite, pat_period), AV_OPT_TYPE_DOUBLE, { .dbl = INT_MAX }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, { "sdt_period", "SDT retransmission time limit in seconds", offsetof(MpegTSWrite, sdt_period), AV_OPT_TYPE_DOUBLE, { .dbl = INT_MAX }, 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, }; AVOutputFormat ff_mpegts_muxer = { .name = "mpegts", .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"), .mime_type = "video/MP2T", .extensions = "ts,m2t,m2ts,mts", .priv_data_size = sizeof(MpegTSWrite), .audio_codec = AV_CODEC_ID_MP2, .video_codec = AV_CODEC_ID_MPEG2VIDEO, .init = mpegts_init, .write_packet = mpegts_write_packet, .write_trailer = mpegts_write_end, .deinit = mpegts_deinit, .check_bitstream = mpegts_check_bitstream, .flags = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS | AVFMT_NODIMENSIONS, .priv_class = &mpegts_muxer_class, };