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mpegtsenc.c
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/*
* 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/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/ac3_parser_internal.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/defs.h"
#include "libavcodec/h264.h"
#include "libavcodec/hevc.h"
#include "libavcodec/vvc.h"
#include "libavcodec/startcode.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "mpegts.h"
#include "mux.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 */
MpegTSSection nit; /* MPEG-2 NIT table context */
MpegTSService **services;
AVPacket *pkt;
int64_t sdt_period; /* SDT period in PCR time base */
int64_t pat_period; /* PAT/PMT period in PCR time base */
int64_t nit_period; /* NIT period in PCR time base */
int nb_services;
int64_t first_pcr;
int first_dts_checked;
int64_t next_pcr;
int mux_rate; ///< set to 1 when VBR
int pes_payload_size;
int64_t total_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 m2ts_video_pid;
int m2ts_audio_pid;
int m2ts_pgssub_pid;
int m2ts_textsub_pid;
int pcr_period_ms;
#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
#define MPEGTS_FLAG_NIT 0x20
#define MPEGTS_FLAG_OMIT_RAI 0x40
int flags;
int copyts;
int tables_version;
int64_t pat_period_us;
int64_t sdt_period_us;
int64_t nit_period_us;
int64_t last_pat_ts;
int64_t last_sdt_ts;
int64_t last_nit_ts;
uint8_t provider_name[256];
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 and NIT */
unsigned int flags = (tid == SDT_TID || tid == NIT_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
#define NIT_RETRANS_TIME 500
typedef struct MpegTSWriteStream {
int pid; /* stream associated pid */
int cc;
int discontinuity;
int payload_size;
int first_timestamp_checked; ///< first pts/dts check needed
int prev_payload_key;
int64_t payload_pts;
int64_t payload_dts;
int payload_flags;
uint8_t *payload;
AVFormatContext *amux;
int data_st_warning;
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;
DVBAC3Descriptor *dvb_ac3_desc;
} 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;
if (ts->flags & MPEGTS_FLAG_NIT) {
put16(&q, 0x0000);
put16(&q, NIT_PID);
}
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->transport_stream_id, 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 int put_arib_caption_descriptor(AVFormatContext *s, uint8_t **q_ptr,
AVCodecParameters *codecpar)
{
uint8_t stream_identifier;
uint16_t data_component_id;
uint8_t *q = *q_ptr;
switch (codecpar->profile) {
case AV_PROFILE_ARIB_PROFILE_A:
stream_identifier = 0x30;
data_component_id = 0x0008;
break;
case AV_PROFILE_ARIB_PROFILE_C:
stream_identifier = 0x87;
data_component_id = 0x0012;
break;
default:
av_log(s, AV_LOG_ERROR,
"Unset/unknown ARIB caption profile %d utilized!\n",
codecpar->profile);
return AVERROR_INVALIDDATA;
}
// stream_identifier_descriptor
*q++ = 0x52; // descriptor_tag
*q++ = 1; // descriptor_length
*q++ = stream_identifier; // component_tag: stream_identifier
// data_component_descriptor, defined in ARIB STD-B10, part 2, 6.2.20
*q++ = 0xFD; // descriptor_tag: ARIB data coding type descriptor
*q++ = 3; // descriptor_length
put16(&q, data_component_id); // data_component_id
// additional_arib_caption_info: defined in ARIB STD-B24, fascicle 1, Part 3, 9.6.1
// Here we utilize a pre-defined set of values defined in ARIB TR-B14,
// Fascicle 2, 4.2.8.5 for PMT usage, with the reserved bits in the middle
// set to 1 (as that is what every broadcaster seems to be doing in
// production).
*q++ = 0x3D; // DMF('0011'), Reserved('11'), Timing('01')
*q_ptr = q;
return 0;
}
static void put_registration_descriptor(uint8_t **q_ptr, uint32_t tag)
{
uint8_t *q = *q_ptr;
*q++ = REGISTRATION_DESCRIPTOR;
*q++ = 4;
*q++ = tag;
*q++ = tag >> 8;
*q++ = tag >> 16;
*q++ = tag >> 24;
*q_ptr = q;
}
static int get_dvb_stream_type(AVFormatContext *s, AVStream *st)
{
MpegTSWrite *ts = s->priv_data;
MpegTSWriteStream *ts_st = st->priv_data;
int stream_type;
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_VVC:
stream_type = STREAM_TYPE_VIDEO_VVC;
break;
case AV_CODEC_ID_CAVS:
stream_type = STREAM_TYPE_VIDEO_CAVS;
break;
case AV_CODEC_ID_AVS2:
stream_type = STREAM_TYPE_VIDEO_AVS2;
break;
case AV_CODEC_ID_AVS3:
stream_type = STREAM_TYPE_VIDEO_AVS3;
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;
case AV_CODEC_ID_SMPTE_2038:
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
case AV_CODEC_ID_DVB_SUBTITLE:
case AV_CODEC_ID_DVB_TELETEXT:
case AV_CODEC_ID_ARIB_CAPTION:
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
case AV_CODEC_ID_SMPTE_KLV:
if (st->codecpar->profile == AV_PROFILE_KLVA_SYNC) {
stream_type = STREAM_TYPE_METADATA;
} else {
stream_type = STREAM_TYPE_PRIVATE_DATA;
}
break;
default:
av_log_once(s, AV_LOG_WARNING, AV_LOG_DEBUG, &ts_st->data_st_warning,
"Stream %d, codec %s, is muxed as a private data stream "
"and may not be recognized upon reading.\n", st->index,
avcodec_get_name(st->codecpar->codec_id));
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
}
return stream_type;
}
static int get_m2ts_stream_type(AVFormatContext *s, AVStream *st)
{
int stream_type;
MpegTSWriteStream *ts_st = st->priv_data;
switch (st->codecpar->codec_id) {
case AV_CODEC_ID_MPEG2VIDEO:
stream_type = STREAM_TYPE_VIDEO_MPEG2;
break;
case AV_CODEC_ID_H264:
stream_type = STREAM_TYPE_VIDEO_H264;
break;
case AV_CODEC_ID_VC1:
stream_type = STREAM_TYPE_VIDEO_VC1;
break;
case AV_CODEC_ID_HEVC:
stream_type = STREAM_TYPE_VIDEO_HEVC;
break;
case AV_CODEC_ID_PCM_BLURAY:
stream_type = 0x80;
break;
case AV_CODEC_ID_AC3:
stream_type = 0x81;
break;
case AV_CODEC_ID_DTS:
stream_type = (st->codecpar->ch_layout.nb_channels > 6) ? 0x85 : 0x82;
break;
case AV_CODEC_ID_TRUEHD:
stream_type = 0x83;
break;
case AV_CODEC_ID_EAC3:
stream_type = 0x84;
break;
case AV_CODEC_ID_HDMV_PGS_SUBTITLE:
stream_type = 0x90;
break;
case AV_CODEC_ID_HDMV_TEXT_SUBTITLE:
stream_type = 0x92;
break;
default:
av_log_once(s, AV_LOG_WARNING, AV_LOG_DEBUG, &ts_st->data_st_warning,
"Stream %d, codec %s, is muxed as a private data stream "
"and may not be recognized upon reading.\n", st->index,
avcodec_get_name(st->codecpar->codec_id));
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
}
return stream_type;
}
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 */
if (ts->m2ts_mode) {
put_registration_descriptor(&q, MKTAG('H', 'D', 'M', 'V'));
*q++ = 0x88; // descriptor_tag - hdmv_copy_control_descriptor
*q++ = 0x04; // descriptor_length
put16(&q, 0x0fff); // CA_System_ID
*q++ = 0xfc; // private_data_byte
*q++ = 0xfc; // private_data_byte
}
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);
const char default_language[] = "und";
const char *language = lang && strlen(lang->value) >= 3 ? lang->value : default_language;
enum AVCodecID codec_id = st->codecpar->codec_id;
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;
}
stream_type = ts->m2ts_mode ? get_m2ts_stream_type(s, st) : get_dvb_stream_type(s, st);
*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 (codec_id == AV_CODEC_ID_AC3)
put_registration_descriptor(&q, MKTAG('A', 'C', '-', '3'));
if (codec_id == AV_CODEC_ID_EAC3)
put_registration_descriptor(&q, MKTAG('E', 'A', 'C', '3'));
if (ts->flags & MPEGTS_FLAG_SYSTEM_B) {
if (codec_id == AV_CODEC_ID_AC3) {
DVBAC3Descriptor *dvb_ac3_desc = ts_st->dvb_ac3_desc;
*q++=0x6a; // AC3 descriptor see A038 DVB SI
if (dvb_ac3_desc) {
int len = 1 +
!!(dvb_ac3_desc->component_type_flag) +
!!(dvb_ac3_desc->bsid_flag) +
!!(dvb_ac3_desc->mainid_flag) +
!!(dvb_ac3_desc->asvc_flag);
*q++ = len;
*q++ = dvb_ac3_desc->component_type_flag << 7 | dvb_ac3_desc->bsid_flag << 6 |
dvb_ac3_desc->mainid_flag << 5 | dvb_ac3_desc->asvc_flag << 4;
if (dvb_ac3_desc->component_type_flag) *q++ = dvb_ac3_desc->component_type;
if (dvb_ac3_desc->bsid_flag) *q++ = dvb_ac3_desc->bsid;
if (dvb_ac3_desc->mainid_flag) *q++ = dvb_ac3_desc->mainid;
if (dvb_ac3_desc->asvc_flag) *q++ = dvb_ac3_desc->asvc;
} else {
*q++=1; // 1 byte, all flags sets to 0
*q++=0; // omit all fields...
}
} else if (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 (codec_id == AV_CODEC_ID_S302M)
put_registration_descriptor(&q, MKTAG('B', 'S', 'S', 'D'));
if (codec_id == AV_CODEC_ID_OPUS) {
int ch = st->codecpar->ch_layout.nb_channels;
/* 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 && ch <= 2) {
/* RTP mapping family */
*q++ = ch;
} else if (st->codecpar->extradata[18] == 1 && ch <= 8 &&
st->codecpar->extradata_size >= 21 + ch) {
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] == ch - coupled_stream_counts[ch] &&
st->codecpar->extradata[20] == coupled_stream_counts[ch] &&
memcmp(&st->codecpar->extradata[21], channel_map_a[ch - 1], ch) == 0) {
*q++ = ch;
} else if (ch >= 2 && st->codecpar->extradata[19] == ch &&
st->codecpar->extradata[20] == 0 &&
memcmp(&st->codecpar->extradata[21], channel_map_b[ch - 1], ch) == 0) {
*q++ = ch | 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 (ch <= 2) {
/* Assume RTP mapping family */
*q++ = ch;
} else {
/* Unsupported */
av_log(s, AV_LOG_ERROR, "Unsupported Opus channel mapping");
*q++ = 0xff;
}
}
if (language != default_language ||
st->disposition & (AV_DISPOSITION_CLEAN_EFFECTS |
AV_DISPOSITION_HEARING_IMPAIRED |
AV_DISPOSITION_VISUAL_IMPAIRED)) {
const char *p, *next;
uint8_t *len_ptr;
*q++ = ISO_639_LANGUAGE_DESCRIPTOR;
len_ptr = q++;
*len_ptr = 0;
for (p = next = language; 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:
if (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 (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;
} else if (codec_id == AV_CODEC_ID_ARIB_CAPTION) {
if (put_arib_caption_descriptor(s, &q, st->codecpar) < 0)
break;
}
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'));
} else if (stream_type == STREAM_TYPE_VIDEO_CAVS || stream_type == STREAM_TYPE_VIDEO_AVS2 ||
stream_type == STREAM_TYPE_VIDEO_AVS3) {
put_registration_descriptor(&q, MKTAG('A', 'V', 'S', 'V'));
}
break;
case AVMEDIA_TYPE_DATA:
if (codec_id == AV_CODEC_ID_SMPTE_KLV) {
put_registration_descriptor(&q, MKTAG('K', 'L', 'V', 'A'));
} else if (codec_id == AV_CODEC_ID_SMPTE_2038) {
put_registration_descriptor(&q, MKTAG('V', 'A', 'N', 'C'));
} else if (codec_id == AV_CODEC_ID_TIMED_ID3) {
const char *tag = "ID3 ";
*q++ = 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->original_network_id);
*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->transport_stream_id, ts->tables_version, 0, 0,
data, q - data);
}
static void mpegts_write_nit(AVFormatContext *s)
{
MpegTSWrite *ts = s->priv_data;
uint8_t data[SECTION_LENGTH], *q, *desc_len_ptr, *loop_len_ptr;
q = data;
//network_descriptors_length
put16(&q, 0xf000 | (ts->provider_name[0] + 2));
//network_name_descriptor
*q++ = 0x40;
putbuf(&q, ts->provider_name, ts->provider_name[0] + 1);
//transport_stream_loop_length
loop_len_ptr = q;
q += 2;
put16(&q, ts->transport_stream_id);
put16(&q, ts->original_network_id);
//transport_descriptors_length
desc_len_ptr = q;
q += 2;
//service_list_descriptor
*q++ = 0x41;
*q++ = 3 * ts->nb_services;
for (int i = 0; i < ts->nb_services; i++) {
put16(&q, ts->services[i]->sid);
*q++ = ts->service_type;
}
//calculate lengths
put16(&desc_len_ptr, 0xf000 | q - (desc_len_ptr + 2));
put16(&loop_len_ptr, 0xf000 | q - (loop_len_ptr + 2));
mpegts_write_section1(&ts->nit, NIT_TID, ts->original_network_id, 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)
{
return av_rescale(ts->total_size + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
ts->first_pcr;
}
static void write_packet(AVFormatContext *s, const uint8_t *packet)
{
MpegTSWrite *ts = s->priv_data;
if (ts->m2ts_mode) {
int64_t pcr = get_pcr(s->priv_data);
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));
}
avio_write(s->pb, packet, TS_PACKET_SIZE);
ts->total_size += TS_PACKET_SIZE;
}
static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
{
AVFormatContext *ctx = s->opaque;
write_packet(ctx, packet);
}
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);