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ffmpeg/libavformat/mpegtsenc.c
Devin Heitmueller 19798229df avformat/mpegts: add support for preserving SMPTE 2038 when transcoding MPEG-TS streams 
Add the appropriate descriptors to the MPEG-TS demux and mux to
ensure that SMPTE 2038 VANC streams are properly preserved
when using codec copy (including adding the appropriate PMT
descriptors).

The focus of this patch is TS input to TS output.  A separate
patch adds support for output of 2038 VANC over decklink SDI.

Thanks to Marton Balint for feedback to preserve ABI compatibility.

Signed-off-by: Devin Heitmueller <dheitmueller@ltnglobal.com>
Signed-off-by: Marton Balint <cus@passwd.hu>
2023-03-26 18:51:25 +02:00

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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/opt.h"
#include "libavcodec/ac3_parser_internal.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/h264.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 FF_PROFILE_ARIB_PROFILE_A:
stream_identifier = 0x30;
data_component_id = 0x0008;
break;
case FF_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_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 == FF_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);
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->pcr_period_ms >= 0) {
int pcr_period_ms = ts->pcr_period_ms == -1 ? PCR_RETRANS_TIME : ts->pcr_period_ms;
ts_st->pcr_period = av_rescale(pcr_period_ms, PCR_TIME_BASE, 1000);
} else {
/* By default, 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;
AVDictionaryEntry *provider;
const char *provider_name;
int i, j;
int ret;
if (ts->m2ts_mode == -1) {
if (av_match_ext(s->url, "m2ts")) {
ts->m2ts_mode = 1;
} else {
ts->m2ts_mode = 0;
}
}
ts->m2ts_video_pid = M2TS_VIDEO_PID;
ts->m2ts_audio_pid = M2TS_AUDIO_START_PID;
ts->m2ts_pgssub_pid = M2TS_PGSSUB_START_PID;
ts->m2ts_textsub_pid = M2TS_TEXTSUB_PID;
if (ts->m2ts_mode) {
ts->pmt_start_pid = M2TS_PMT_PID;
if (s->nb_programs > 1) {
av_log(s, AV_LOG_ERROR, "Only one program is allowed in m2ts mode!\n");
return AVERROR(EINVAL);
}
}
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;
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;
ts->nit.pid = NIT_PID;
ts->nit.cc = 15;
ts->nit.discontinuity= ts->flags & MPEGTS_FLAG_DISCONT;
ts->nit.write_packet = section_write_packet;
ts->nit.opaque = s;
ts->pkt = ffformatcontext(s)->pkt;
/* 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) {
return AVERROR(ENOMEM);
}
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) {
return AVERROR(ENOMEM);
}
/* MPEG pid values < 16 are reserved. Applications which set st->id in
* this range are assigned a calculated pid. */
if (st->id < 16) {
if (ts->m2ts_mode) {
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
ts_st->pid = ts->m2ts_video_pid++;
break;
case AVMEDIA_TYPE_AUDIO:
ts_st->pid = ts->m2ts_audio_pid++;
break;
case AVMEDIA_TYPE_SUBTITLE:
switch (st->codecpar->codec_id) {
case AV_CODEC_ID_HDMV_PGS_SUBTITLE:
ts_st->pid = ts->m2ts_pgssub_pid++;
break;
case AV_CODEC_ID_HDMV_TEXT_SUBTITLE:
ts_st->pid = ts->m2ts_textsub_pid++;
break;
}
break;
}
if (ts->m2ts_video_pid > M2TS_VIDEO_PID + 1 ||
ts->m2ts_audio_pid > M2TS_AUDIO_START_PID + 32 ||
ts->m2ts_pgssub_pid > M2TS_PGSSUB_START_PID + 32 ||
ts->m2ts_textsub_pid > M2TS_TEXTSUB_PID + 1 ||
ts_st->pid < 16) {
av_log(s, AV_LOG_ERROR, "Cannot automatically assign PID for stream %d\n", st->index);
return AVERROR(EINVAL);
}
} else {
ts_st->pid = ts->start_pid + i;
}
} else {
ts_st->pid = st->id;
}
if (ts_st->pid >= 0x1FFF) {
av_log(s, AV_LOG_ERROR,
"Invalid stream id %d, must be less than 8191\n", st->id);
return AVERROR(EINVAL);
}
for (j = 0; j < ts->nb_services; j++) {
if (ts->services[j]->pmt.pid > LAST_OTHER_PID) {
av_log(s, AV_LOG_ERROR,
"Invalid PMT PID %d, must be less than %d\n", ts->services[j]->pmt.pid, LAST_OTHER_PID + 1);
return AVERROR(EINVAL);
}
if (ts_st->pid == ts->services[j]->pmt.pid) {
av_log(s, AV_LOG_ERROR, "PID %d cannot be both elementary and PMT PID\n", ts_st->pid);
return AVERROR(EINVAL);
}
}
for (j = 0; j < i; j++) {
MpegTSWriteStream *ts_st_prev = s->streams[j]->priv_data;
if (ts_st_prev->pid == ts_st->pid) {
av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
return AVERROR(EINVAL);
}
}
ts_st->payload_pts = AV_NOPTS_VALUE;
ts_st->payload_dts = AV_NOPTS_VALUE;
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) {
return AVERROR(ENOMEM);
}
ts_st->amux->oformat =
av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",
NULL, NULL);
if (!ts_st->amux->oformat) {
return AVERROR(EINVAL);
}
if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {
return AVERROR(ENOMEM);
}
ret = avcodec_parameters_copy(ast->codecpar, st->codecpar);
if (ret != 0)
return ret;
ast->time_base = st->time_base;
ret = avformat_write_header(ts_st->amux, NULL);
if (ret < 0)
return ret;
}
if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
ts_st->opus_pending_trim_start = st->codecpar->initial_padding * 48000 / st->codecpar->sample_rate;
}
}
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;
ts->last_nit_ts = AV_NOPTS_VALUE;
ts->pat_period = av_rescale(ts->pat_period_us, PCR_TIME_BASE, AV_TIME_BASE);
ts->sdt_period = av_rescale(ts->sdt_period_us, PCR_TIME_BASE, AV_TIME_BASE);
ts->nit_period = av_rescale(ts->nit_period_us, PCR_TIME_BASE, AV_TIME_BASE);
/* assign provider name */
provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
if (encode_str8(ts->provider_name, provider_name) < 0) {
av_log(s, AV_LOG_ERROR, "Too long provider name\n");
return AVERROR(EINVAL);
}
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 %"PRId64" ms, pat/pmt every %"PRId64" ms",
av_rescale(ts->sdt_period, 1000, PCR_TIME_BASE),
av_rescale(ts->pat_period, 1000, PCR_TIME_BASE));
if (ts->flags & MPEGTS_FLAG_NIT)
av_log(s, AV_LOG_VERBOSE, ", nit every %"PRId64" ms", av_rescale(ts->nit_period, 1000, PCR_TIME_BASE));
av_log(s, AV_LOG_VERBOSE, "\n");
return 0;
}
/* send SDT, NIT, PAT and PMT tables regularly */
static void retransmit_si_info(AVFormatContext *s, int force_pat, int force_sdt, int force_nit, int64_t pcr)
{
MpegTSWrite *ts = s->priv_data;
int i;
if ((pcr != AV_NOPTS_VALUE && ts->last_sdt_ts == AV_NOPTS_VALUE) ||
(pcr != AV_NOPTS_VALUE && pcr - ts->last_sdt_ts >= ts->sdt_period) ||
force_sdt
) {
if (pcr != AV_NOPTS_VALUE)
ts->last_sdt_ts = FFMAX(pcr, ts->last_sdt_ts);
mpegts_write_sdt(s);
}
if ((pcr != AV_NOPTS_VALUE && ts->last_pat_ts == AV_NOPTS_VALUE) ||
(pcr != AV_NOPTS_VALUE && pcr - ts->last_pat_ts >= ts->pat_period) ||
force_pat) {
if (pcr != AV_NOPTS_VALUE)
ts->last_pat_ts = FFMAX(pcr, ts->last_pat_ts);
mpegts_write_pat(s);
for (i = 0; i < ts->nb_services; i++)
mpegts_write_pmt(s, ts->services[i]);
}
if ((pcr != AV_NOPTS_VALUE && ts->last_nit_ts == AV_NOPTS_VALUE) ||
(pcr != AV_NOPTS_VALUE && pcr - ts->last_nit_ts >= ts->nit_period) ||
force_nit
) {
if (pcr != AV_NOPTS_VALUE)
ts->last_nit_ts = FFMAX(pcr, ts->last_nit_ts);
if (ts->flags & MPEGTS_FLAG_NIT)
mpegts_write_nit(s);
}
}
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));
write_packet(s, buf);
}
/* 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));
/* stuffing bytes */
memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
write_packet(s, buf);
}
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;
}
static int get_pes_stream_id(AVFormatContext *s, AVStream *st, int stream_id, int *async)
{
MpegTSWrite *ts = s->priv_data;
*async = 0;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC)
return STREAM_ID_EXTENDED_STREAM_ID;
else
return STREAM_ID_VIDEO_STREAM_0;
} 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)) {
return STREAM_ID_AUDIO_STREAM_0;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
st->codecpar->codec_id == AV_CODEC_ID_AC3 &&
ts->m2ts_mode) {
return STREAM_ID_EXTENDED_STREAM_ID;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA &&
st->codecpar->codec_id == AV_CODEC_ID_TIMED_ID3) {
return STREAM_ID_PRIVATE_STREAM_1;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA) {
if (st->codecpar->codec_id == AV_CODEC_ID_SMPTE_KLV &&
stream_id == STREAM_ID_PRIVATE_STREAM_1) /* asynchronous KLV */
*async = 1;
return stream_id != -1 ? stream_id : STREAM_ID_METADATA_STREAM;
} else {
return STREAM_ID_PRIVATE_STREAM_1;
}
}
/* 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, flags;
int afc_len, stuffing_len;
int is_dvb_subtitle = (st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE);
int is_dvb_teletext = (st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT);
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;
int force_sdt = 0;
int force_nit = 0;
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;
}
if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
force_pat = 1;
force_sdt = 1;
force_nit = 1;
ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
}
is_start = 1;
while (payload_size > 0) {
int64_t pcr = AV_NOPTS_VALUE;
if (ts->mux_rate > 1)
pcr = get_pcr(ts);
else if (dts != AV_NOPTS_VALUE)
pcr = (dts - delay) * 300;
retransmit_si_info(s, force_pat, force_sdt, force_nit, pcr);
force_pat = 0;
force_sdt = 0;
force_nit = 0;
write_pcr = 0;
if (ts->mux_rate > 1) {
/* Send PCR packets for all PCR streams if needed */
pcr = get_pcr(ts);
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);
} else {
write_pcr = 1;
}
}
next_pcr = FFMIN(next_pcr, ts_st2->last_pcr + ts_st2->pcr_period);
}
}
ts->next_pcr = next_pcr;
}
if (dts != AV_NOPTS_VALUE && (dts - pcr / 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;
}
} else if (ts_st->pcr_period && pcr != AV_NOPTS_VALUE) {
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;
}
}
/* prepare packet header */
q = buf;
*q++ = 0x47;
val = ts_st->pid >> 8;
if (ts->m2ts_mode && st->codecpar->codec_id == AV_CODEC_ID_AC3)
val |= 0x20;
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 (!(ts->flags & MPEGTS_FLAG_OMIT_RAI) &&
key && is_start && pts != AV_NOPTS_VALUE &&
!is_dvb_teletext /* adaptation+payload forbidden for teletext (ETSI EN 300 472 V1.3.1 4.1) */) {
// 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;
int async;
/* write PES header */
*q++ = 0x00;
*q++ = 0x00;
*q++ = 0x01;
*q++ = stream_id = get_pes_stream_id(s, st, stream_id, &async);
if (async)
pts = dts = AV_NOPTS_VALUE;
header_len = 0;
if (stream_id != STREAM_ID_PROGRAM_STREAM_MAP &&
stream_id != STREAM_ID_PADDING_STREAM &&
stream_id != STREAM_ID_PRIVATE_STREAM_2 &&
stream_id != STREAM_ID_ECM_STREAM &&
stream_id != STREAM_ID_EMM_STREAM &&
stream_id != STREAM_ID_PROGRAM_STREAM_DIRECTORY &&
stream_id != STREAM_ID_DSMCC_STREAM &&
stream_id != STREAM_ID_TYPE_E_STREAM) {
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;
}
} else {
len = payload_size;
*q++ = len >> 8;
*q++ = len;
}
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;
write_packet(s, buf);
}
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 <vincent.penquerch@collabora.co.uk>
*/
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;
const 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;
const int64_t max_audio_delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) / 2;
int64_t dts = pkt->dts, pts = pkt->pts;
int opus_samples = 0;
size_t 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->first_dts_checked && dts != AV_NOPTS_VALUE) {
ts->first_pcr += dts * 300;
ts->first_dts_checked = 1;
}
if (ts->copyts < 1) {
if (pts != AV_NOPTS_VALUE)
pts += delay;
if (dts != AV_NOPTS_VALUE)
dts += delay;
}
if (!ts_st->first_timestamp_checked && (pts == AV_NOPTS_VALUE || dts == AV_NOPTS_VALUE)) {
av_log(s, AV_LOG_ERROR, "first pts and dts value must be set\n");
return AVERROR_INVALIDDATA;
}
ts_st->first_timestamp_checked = 1;
if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
const uint8_t *p = buf, *buf_end = p + size;
const uint8_t *found_aud = NULL, *found_aud_end = NULL;
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;
/* Ensure that all pictures are prefixed with an AUD, and that
* IDR pictures are also prefixed with SPS and PPS. SPS and PPS
* are assumed to be available in 'extradata' if not found in-band. */
do {
p = avpriv_find_start_code(p, buf_end, &state);
av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", state & 0x1f);
if ((state & 0x1f) == H264_NAL_SPS)
extradd = 0;
if ((state & 0x1f) == H264_NAL_AUD) {
found_aud = p - 4; // start of the 0x000001 start code.
found_aud_end = p + 1; // first byte past the AUD.
if (found_aud < buf)
found_aud = buf;
if (buf_end < found_aud_end)
found_aud_end = buf_end;
}
} while (p < buf_end
&& (state & 0x1f) != H264_NAL_IDR_SLICE
&& (state & 0x1f) != H264_NAL_SLICE
&& (extradd > 0 || !found_aud));
if ((state & 0x1f) != H264_NAL_IDR_SLICE)
extradd = 0;
if (!found_aud) {
/* Prefix 'buf' with the missing AUD, and extradata if needed. */
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] = H264_NAL_AUD;
data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
buf = data;
size = pkt->size + 6 + extradd;
} else if (extradd != 0) {
/* Move the AUD up to the beginning of the frame, where the H.264
* spec requires it to appear. Emit the extradata after it. */
PutByteContext pb;
const int new_pkt_size = pkt->size + 1 + extradd;
data = av_malloc(new_pkt_size);
if (!data)
return AVERROR(ENOMEM);
bytestream2_init_writer(&pb, data, new_pkt_size);
bytestream2_put_byte(&pb, 0x00);
bytestream2_put_buffer(&pb, found_aud, found_aud_end - found_aud);
bytestream2_put_buffer(&pb, st->codecpar->extradata, extradd);
bytestream2_put_buffer(&pb, pkt->data, found_aud - pkt->data);
bytestream2_put_buffer(&pb, found_aud_end, buf_end - found_aud_end);
av_assert0(new_pkt_size == bytestream2_tell_p(&pb));
buf = data;
size = new_pkt_size;
}
} 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 = ts->pkt;
if (!ts_st->amux) {
av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
"and extradata missing\n");
} else {
av_packet_unref(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 ret;
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;
size_t 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");
}
} else if (st->codecpar->codec_id == AV_CODEC_ID_AC3 && !ts_st->dvb_ac3_desc) {
AC3HeaderInfo *hdr = NULL;
if (avpriv_ac3_parse_header(&hdr, pkt->data, pkt->size) >= 0) {
uint8_t number_of_channels_flag;
uint8_t service_type_flag;
uint8_t full_service_flag = 1;
DVBAC3Descriptor *dvb_ac3_desc;
dvb_ac3_desc = av_mallocz(sizeof(*dvb_ac3_desc));
if (!dvb_ac3_desc) {
av_free(hdr);
return AVERROR(ENOMEM);
}
service_type_flag = hdr->bitstream_mode;
switch (hdr->channel_mode) {
case AC3_CHMODE_DUALMONO:
number_of_channels_flag = 1;
break;
case AC3_CHMODE_MONO:
number_of_channels_flag = 0;
break;
case AC3_CHMODE_STEREO:
if (hdr->dolby_surround_mode == AC3_DSURMOD_ON)
number_of_channels_flag = 3;
else
number_of_channels_flag = 2;
break;
case AC3_CHMODE_3F:
case AC3_CHMODE_2F1R:
case AC3_CHMODE_3F1R:
case AC3_CHMODE_2F2R:
case AC3_CHMODE_3F2R:
number_of_channels_flag = 4;
break;
default: /* reserved */
number_of_channels_flag = 7;
break;
}
if (service_type_flag == 1 || service_type_flag == 4 ||
(service_type_flag == 7 && !number_of_channels_flag))
full_service_flag = 0;
dvb_ac3_desc->component_type_flag = 1;
dvb_ac3_desc->component_type = (full_service_flag << 6) |
((service_type_flag & 0x7) << 3) |
(number_of_channels_flag & 0x7);
dvb_ac3_desc->bsid_flag = 1;
dvb_ac3_desc->bsid = hdr->bitstream_id;
dvb_ac3_desc->mainid_flag = 0;
dvb_ac3_desc->asvc_flag = 0;
ts_st->dvb_ac3_desc = dvb_ac3_desc;
}
av_free(hdr);
} else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_BLURAY && ts->m2ts_mode) {
mpegts_write_pes(s, st, buf, size, pts, dts,
pkt->flags & AV_PKT_FLAG_KEY, stream_id);
return 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 &&
dts - ts_st->payload_dts >= max_audio_delay) ||
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)
{
MpegTSWrite *ts = s->priv_data;
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;
}
}
if (ts->m2ts_mode) {
int packets = (avio_tell(s->pb) / (TS_PACKET_SIZE + 4)) % 32;
while (packets++ < 32)
mpegts_insert_null_packet(s);
}
}
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->dvb_ac3_desc);
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(AVFormatContext *s, AVStream *st,
const AVPacket *pkt)
{
int ret = 1;
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;
}
#define OFFSET(x) offsetof(MpegTSWrite, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "mpegts_transport_stream_id", "Set transport_stream_id field.",
OFFSET(transport_stream_id), AV_OPT_TYPE_INT, { .i64 = 0x0001 }, 0x0001, 0xffff, ENC },
{ "mpegts_original_network_id", "Set original_network_id field.",
OFFSET(original_network_id), AV_OPT_TYPE_INT, { .i64 = DVB_PRIVATE_NETWORK_START }, 0x0001, 0xffff, ENC },
{ "mpegts_service_id", "Set service_id field.",
OFFSET(service_id), AV_OPT_TYPE_INT, { .i64 = 0x0001 }, 0x0001, 0xffff, ENC },
{ "mpegts_service_type", "Set service_type field.",
OFFSET(service_type), AV_OPT_TYPE_INT, { .i64 = 0x01 }, 0x01, 0xff, ENC, "mpegts_service_type" },
{ "digital_tv", "Digital Television.",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_TV }, 0x01, 0xff, ENC, "mpegts_service_type" },
{ "digital_radio", "Digital Radio.",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_DIGITAL_RADIO }, 0x01, 0xff, ENC, "mpegts_service_type" },
{ "teletext", "Teletext.",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_TELETEXT }, 0x01, 0xff, ENC, "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, ENC, "mpegts_service_type" },
{ "mpeg2_digital_hdtv", "MPEG2 Digital HDTV.",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_MPEG2_DIGITAL_HDTV }, 0x01, 0xff, ENC, "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, ENC, "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, ENC, "mpegts_service_type" },
{ "hevc_digital_hdtv", "HEVC Digital Television Service.",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_SERVICE_TYPE_HEVC_DIGITAL_HDTV }, 0x01, 0xff, ENC, "mpegts_service_type" },
{ "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
OFFSET(pmt_start_pid), AV_OPT_TYPE_INT, { .i64 = 0x1000 }, FIRST_OTHER_PID, LAST_OTHER_PID, ENC },
{ "mpegts_start_pid", "Set the first pid.",
OFFSET(start_pid), AV_OPT_TYPE_INT, { .i64 = 0x0100 }, FIRST_OTHER_PID, LAST_OTHER_PID, ENC },
{ "mpegts_m2ts_mode", "Enable m2ts mode.", OFFSET(m2ts_mode), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, ENC },
{ "muxrate", NULL, OFFSET(mux_rate), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, INT_MAX, ENC },
{ "pes_payload_size", "Minimum PES packet payload in bytes",
OFFSET(pes_payload_size), AV_OPT_TYPE_INT, { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, ENC },
{ "mpegts_flags", "MPEG-TS muxing flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX, ENC, "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, ENC, "mpegts_flags" },
{ "latm", "Use LATM packetization for AAC",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX, ENC, "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, ENC, "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, ENC, "mpegts_flags" },
{ "initial_discontinuity", "Mark initial packets as discontinuous",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_DISCONT }, 0, INT_MAX, ENC, "mpegts_flags" },
{ "nit", "Enable NIT transmission",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_NIT}, 0, INT_MAX, ENC, "mpegts_flags" },
{ "omit_rai", "Disable writing of random access indicator",
0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_OMIT_RAI }, 0, INT_MAX, ENC, "mpegts_flags" },
{ "mpegts_copyts", "don't offset dts/pts", OFFSET(copyts), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, ENC },
{ "tables_version", "set PAT, PMT, SDT and NIT version", OFFSET(tables_version), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 31, ENC },
{ "omit_video_pes_length", "Omit the PES packet length for video packets",
OFFSET(omit_video_pes_length), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, ENC },
{ "pcr_period", "PCR retransmission time in milliseconds",
OFFSET(pcr_period_ms), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, ENC },
{ "pat_period", "PAT/PMT retransmission time limit in seconds",
OFFSET(pat_period_us), AV_OPT_TYPE_DURATION, { .i64 = PAT_RETRANS_TIME * 1000LL }, 0, INT64_MAX, ENC },
{ "sdt_period", "SDT retransmission time limit in seconds",
OFFSET(sdt_period_us), AV_OPT_TYPE_DURATION, { .i64 = SDT_RETRANS_TIME * 1000LL }, 0, INT64_MAX, ENC },
{ "nit_period", "NIT retransmission time limit in seconds",
OFFSET(nit_period_us), AV_OPT_TYPE_DURATION, { .i64 = NIT_RETRANS_TIME * 1000LL }, 0, INT64_MAX, ENC },
{ NULL },
};
static const AVClass mpegts_muxer_class = {
.class_name = "MPEGTS muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFOutputFormat ff_mpegts_muxer = {
.p.name = "mpegts",
.p.long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
.p.mime_type = "video/MP2T",
.p.extensions = "ts,m2t,m2ts,mts",
.priv_data_size = sizeof(MpegTSWrite),
.p.audio_codec = AV_CODEC_ID_MP2,
.p.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,
.p.flags = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS | AVFMT_NODIMENSIONS,
.p.priv_class = &mpegts_muxer_class,
};
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