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ffmpeg/libavformat/mpegtsenc.c
Andreas Rheinhardt 1fc5d327e4 avformat/(mpeg|mpegts|mxf|sup)enc: Use const uint8_t* to access pkt data 
The packets muxers receive are not guaranteed to be writable,
so they must not be modified. Ergo only access the packet's data
via a const uint8_t*.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-07-04 14:56:43 +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/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
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_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_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 (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 (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;
uint32_t state = -1;
int extradd = (pkt->flags & AV_PKT_FLAG_KEY) ? st->codecpar->extradata_size : 0;
int ret = ff_check_h264_startcode(s, st, pkt);
if (ret < 0)
return ret;
if (extradd && AV_RB24(st->codecpar->extradata) > 1)
extradd = 0;
do {
p = avpriv_find_start_code(p, buf_end, &state);
av_log(s, AV_LOG_TRACE, "nal %"PRId32"\n", state & 0x1f);
if ((state & 0x1f) == 7)
extradd = 0;
} while (p < buf_end && (state & 0x1f) != 9 &&
(state & 0x1f) != 5 && (state & 0x1f) != 1);
if ((state & 0x1f) != 5)
extradd = 0;
if ((state & 0x1f) != 9) { // AUD NAL
data = av_malloc(pkt->size + 6 + extradd);
if (!data)
return AVERROR(ENOMEM);
memcpy(data + 6, st->codecpar->extradata, extradd);
memcpy(data + 6 + extradd, pkt->data, pkt->size);
AV_WB32(data, 0x00000001);
data[4] = 0x09;
data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
buf = data;
size = pkt->size + 6 + extradd;
}
} else if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
if (pkt->size < 2) {
av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
return AVERROR_INVALIDDATA;
}
if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
int ret;
AVPacket *pkt2 = 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" },
{ "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 AVOutputFormat ff_mpegts_muxer = {
.name = "mpegts",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
.mime_type = "video/MP2T",
.extensions = "ts,m2t,m2ts,mts",
.priv_data_size = sizeof(MpegTSWrite),
.audio_codec = AV_CODEC_ID_MP2,
.video_codec = AV_CODEC_ID_MPEG2VIDEO,
.init = mpegts_init,
.write_packet = mpegts_write_packet,
.write_trailer = mpegts_write_end,
.deinit = mpegts_deinit,
.check_bitstream = mpegts_check_bitstream,
.flags = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS | AVFMT_NODIMENSIONS,
.priv_class = &mpegts_muxer_class,
};
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