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- /*
- * MPEG2 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/bswap.h"
- #include "libavutil/crc.h"
- #include "libavutil/dict.h"
- #include "libavutil/mathematics.h"
- #include "libavutil/opt.h"
- #include "libavutil/avassert.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 m2ts_mode;
- int reemit_pat_pmt; // backward compatibility
- #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
- #define MPEGTS_FLAG_AAC_LATM 0x02
- int flags;
- int copyts;
- } 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 }, 0x0010, 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},
- {"mpegts_m2ts_mode", "Enable m2ts mode.",
- offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.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"},
- // 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},
- { "mpegts_copyts", "dont offset dts/pts",
- offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, 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 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 "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
- int prev_payload_key;
- 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 int 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_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;
- }
- if (q - data > sizeof(data) - 32)
- return AVERROR(EINVAL);
- *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(st->codec->codec_id==AV_CODEC_ID_EAC3){
- *q++=0x7a; // EAC3 descriptor see A038 DVB SI
- *q++=1; // 1 byte, all flags sets to 0
- *q++=0; // omit all fields...
- }
- if(st->codec->codec_id==AV_CODEC_ID_S302M){
- *q++ = 0x05; /* MPEG-2 registration descriptor*/
- *q++ = 4;
- *q++ = 'B';
- *q++ = 'S';
- *q++ = 'S';
- *q++ = 'D';
- }
- 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 && q - data < sizeof(data) - 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);
- return 0;
- }
- /* 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 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 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);
- if(ts->copyts < 1)
- ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
- } else {
- /* Arbitrary values, PAT/PMT will also be written on video 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);
- }
- if(!service->pcr_packet_period)
- service->pcr_packet_period = 1;
- }
- // 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_INFO, "muxrate VBR, ");
- else
- av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
- av_log(s, AV_LOG_INFO, "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);
- if (ts->m2ts_mode == -1) {
- if (av_match_ext(s->filename, "m2ts")) {
- ts->m2ts_mode = 1;
- } else {
- ts->m2ts_mode = 0;
- }
- }
- 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, int force_pat)
- {
- 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 || force_pat) {
- 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 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 */
- /* 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 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);
- int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
- is_start = 1;
- while (payload_size > 0) {
- retransmit_si_info(s, force_pat);
- force_pat = 0;
- 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 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
- st->codec->codec_id == AV_CODEC_ID_AC3 &&
- ts->m2ts_mode) {
- *q++ = 0xfd;
- } 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;
- }
- /* 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->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
- st->codec->codec_id == AV_CODEC_ID_AC3) {
- /* set PES_extension_flag */
- pes_extension = 1;
- flags |= 0x01;
- 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;
- }
- /* For Blu-ray AC3 Audio Setting extended flags */
- if (ts->m2ts_mode &&
- pes_extension &&
- st->codec->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 (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;
- mpegts_prefix_m2ts_header(s);
- avio_write(s->pb, buf, TS_PACKET_SIZE);
- }
- avio_flush(s->pb);
- ts_st->prev_payload_key = key;
- }
- 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;
- 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(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 set\n");
- return AVERROR_INVALIDDATA;
- }
- 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 the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
- return AVERROR(EINVAL);
- }
- do {
- p = avpriv_mpv_find_start_code(p, buf_end, &state);
- //av_log(s, AV_LOG_INFO, "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_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");
- return AVERROR_INVALIDDATA;
- }
- 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 (pkt->dts != AV_NOPTS_VALUE) {
- int i;
- for(i=0; i<s->nb_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);
- ts_st2->payload_size = 0;
- }
- }
- }
- if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_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 (st->codec->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);
- 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,m2ts,mts",
- .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,
- };
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