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libmpegts.c
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libmpegts.c
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/*****************************************************************************
* libmpegts.c :
*****************************************************************************
* Copyright (C) 2010 Kieran Kunhya
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*****************************************************************************/
#include "common.h"
#include "codecs.h"
#include "atsc/atsc.h"
#include "cablelabs/cablelabs.h"
#include "dvb/dvb.h"
#include "hdmv/hdmv.h"
#include "isdb/isdb.h"
#include "smpte/smpte.h"
#include "crc/crc.h"
#include <math.h>
static const int steam_type_table[27][2] =
{
{ LIBMPEGTS_VIDEO_MPEG2, VIDEO_MPEG2 },
{ LIBMPEGTS_VIDEO_AVC, VIDEO_AVC },
{ LIBMPEGTS_AUDIO_MPEG1, AUDIO_MPEG1 },
{ LIBMPEGTS_AUDIO_MPEG2, AUDIO_MPEG2 },
{ LIBMPEGTS_AUDIO_ADTS, AUDIO_ADTS },
{ LIBMPEGTS_AUDIO_LATM, AUDIO_LATM },
{ LIBMPEGTS_AUDIO_AC3, AUDIO_AC3 }, /* ATSC/Generic */
{ LIBMPEGTS_AUDIO_AC3, PRIVATE_DATA }, /* DVB */
{ LIBMPEGTS_AUDIO_EAC3, AUDIO_EAC3 }, /* ATSC/Generic */
{ LIBMPEGTS_AUDIO_EAC3, PRIVATE_DATA }, /* DVB */
{ LIBMPEGTS_AUDIO_LPCM, AUDIO_LPCM },
{ LIBMPEGTS_AUDIO_DTS, AUDIO_DTS },
{ LIBMPEGTS_AUDIO_DOLBY_LOSSLESS, AUDIO_DOLBY_LOSSLESS },
{ LIBMPEGTS_AUDIO_DTS_HD, AUDIO_DTS_HD },
{ LIBMPEGTS_AUDIO_DTS_HD_XLL, AUDIO_DTS_HD_XLL },
{ LIBMPEGTS_AUDIO_EAC3_SECONDARY, AUDIO_EAC3_SECONDARY },
{ LIBMPEGTS_AUDIO_DTS_HD_SECONDARY, AUDIO_DTS_HD_SECONDARY },
{ LIBMPEGTS_SUB_PRESENTATION_GRAPHICS, SUB_PRESENTATION_GRAPHICS },
{ LIBMPEGTS_SUB_INTERACTIVE_GRAPHICS, SUB_INTERACTIVE_GRAPHICS },
{ LIBMPEGTS_SUB_TEXT, SUB_TEXT },
{ LIBMPEGTS_AUDIO_302M, PRIVATE_DATA },
{ LIBMPEGTS_DVB_SUB, PRIVATE_DATA },
{ LIBMPEGTS_DVB_TELETEXT, PRIVATE_DATA },
{ LIBMPEGTS_DVB_VBI, PRIVATE_DATA },
{ LIBMPEGTS_ANCILLARY_RDD11, PRIVATE_DATA },
{ LIBMPEGTS_ANCILLARY_2038, PRIVATE_DATA },
{ 0 },
};
/**** Descriptors ****/
/** MPEG-2 Systems Descriptors **/
/* Registration Descriptor */
void write_registration_descriptor( bs_t *s, int descriptor_tag, int descriptor_length, char *format_id )
{
bs_write( s, 8, descriptor_tag ); // descriptor_tag
bs_write( s, 8, descriptor_length ); // descriptor_length
while( *format_id != '\0' )
bs_write( s, 8, *format_id++ ); // format_identifier
}
/* First loop of PMT Descriptors */
static void write_smoothing_buffer_descriptor( bs_t *s, ts_int_program_t *program )
{
bs_write( s, 8, SMOOTHING_BUFFER_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 0x4 ); // descriptor_length
bs_write( s, 2, 0x3 ); // reserved
bs_write( s, 22, program->sb_leak_rate ); // sb_leak_rate
bs_write( s, 2, 0x3 ); // reserved
bs_write( s, 22, program->sb_size ); // sb_size
}
/* Second loop of PMT Descriptors */
#if 0
static void write_video_stream_descriptor( bs_t *s, ts_int_stream_t *stream )
{
bs_write( s, 8, VIDEO_STREAM_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 0x04 ); // descriptor_length
bs_write1( s, 0 ); // multiple_frame_rate_flag
bs_write( s, 4, 0 ); // frame_rate_code FIXME
bs_write1( s, 0 ); // MPEG_1_only_flag
bs_write1( s, 0 ); // constrained_parameter_flag
bs_write1( s, 0 ); // still_picture_flag
bs_write( s, 8, 0 ); // profile_and_level_indication FIXME
bs_write( s, 2, 0 ); // chroma_format FIXME
bs_write1( s, 0 ); // frame_rate_extension_flag FIXME
bs_write( s, 5, 0x1f ); // reserved
}
#endif
static void write_avc_descriptor( bs_t *s, ts_int_program_t *program, ts_int_stream_t *stream )
{
bs_write( s, 8, AVC_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 0x04 ); // descriptor_length
bs_write( s, 8, avc_profiles[stream->mpegvideo_ctx->profile] ); // profile_idc
bs_write1( s, stream->mpegvideo_ctx->profile == AVC_BASELINE ); // constraint_set0_flag
bs_write1( s, stream->mpegvideo_ctx->profile <= AVC_MAIN ); // constraint_set1_flag
bs_write1( s, 0 ); // constraint_set2_flag
if( stream->mpegvideo_ctx->level == 9 && stream->mpegvideo_ctx->profile <= AVC_MAIN ) // level 1b
bs_write1( s, 1 ); // constraint_set3_flag
else if( stream->mpegvideo_ctx->profile == AVC_HIGH_10_INTRA ||
stream->mpegvideo_ctx->profile == AVC_CAVLC_444_INTRA ||
stream->mpegvideo_ctx->profile == AVC_HIGH_444_INTRA )
bs_write1( s, 1 ); // constraint_set3_flag
else
bs_write1( s, 0 ); // constraint_set3_flag
bs_write1( s, 0 ); // constraint_set4_flag
bs_write1( s, 0 ); // constraint_set5_flag
bs_write( s, 2, 0 ); // reserved
bs_write( s, 8, stream->mpegvideo_ctx->level & 0xff ); // level_idc
bs_write( s, 1, 0 ); // AVC_still_present
bs_write( s, 1, 0 ); // AVC_24_hour_picture_flag
bs_write( s, 1, !program->is_3dtv ); // Frame_Packing_SEI_not_present_flag
bs_write( s, 5, 0x1f ); // reserved
}
static void write_data_stream_alignment_descriptor( bs_t *s )
{
bs_write( s, 8, DATA_STREAM_ALIGNMENT_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 1 ); // descriptor_length
// FIXME make UK-DTG compliant
bs_write( s, 8, 1 ); // alignment_type
}
static void write_mpeg2_aac_descriptor( bs_t *s, ts_int_stream_t *stream )
{
bs_write( s, 8, MPEG2_AAC_AUDIO_DESCRIPTOR ); // descriptor_tag
bs_write( s, 8, 0x3 ); // descriptor_length
bs_write( s, 8, stream->aac_profile ); // MPEG-2_AAC_profile
bs_write( s, 8, stream->aac_channel_map ); // MPEG-2_AAC_channel_configuration
bs_write( s, 8, 0 ); // MPEG-2_AAC_additional_information (anybody use this?)
}
/* AC-3 Descriptor for DVB and Blu-Ray */
static void write_ac3_descriptor( ts_writer_t *w, bs_t *s, int e_ac3 )
{
if( w->ts_type == TS_TYPE_BLU_RAY )
bs_write( s, 8, HDMV_AC3_DESCRIPTOR_TAG ); // descriptor_tag
else if( e_ac3 )
bs_write( s, 8, DVB_EAC3_DESCRIPTOR_TAG ); // descriptor_tag
else
bs_write( s, 8, DVB_AC3_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 1 ); // descriptor_length
/* does anything need these set? */
bs_write1( s, 0 ); // component_type_flag
bs_write1( s, 0 ); // bsid_flag
bs_write1( s, 0 ); // mainid_flag
bs_write1( s, 0 ); // asvc_flag
if( e_ac3 )
{
bs_write1( s, 0 ); // mixinfoexists
bs_write1( s, 0 ); // substream1_flag
bs_write1( s, 0 ); // substream2_flag
bs_write1( s, 0 ); // substream3_flag
}
else
bs_write( s, 4, 0 ); // reserved
}
static void write_iso_lang_descriptor( bs_t *s, ts_int_stream_t *stream )
{
bs_write( s, 8, ISO_693_LANGUAGE_DESCRIPTOR_TAG ); // descriptor_tag
bs_write( s, 8, 0x4 ); // descriptor_length
for( int i = 0; i < 3; i++ )
bs_write( s, 8, stream->lang_code[i] );
bs_write(s, 8, stream->audio_type ); // audio_type
}
/**** PCR functions ****/
static int check_pcr( ts_writer_t *w, ts_int_program_t *program )
{
// if the next packet written goes over the max pcr retransmit boundary, write the pcr in the next packet
double next_pkt_pcr = ((w->packets_written * TS_PACKET_SIZE) + (TS_PACKET_SIZE + 7)) * 8.0 / w->ts_muxrate -
(double)program->last_pcr / TS_CLOCK;
next_pkt_pcr += TS_START;
if( next_pkt_pcr >= (double)w->pcr_period / 1000 )
{
return 1;
}
return 0;
}
static int64_t get_pcr_int( ts_writer_t *w, double offset )
{
return (int64_t)((8.0 * (w->packets_written * TS_PACKET_SIZE + offset) / w->ts_muxrate) * TS_CLOCK + 0.5) + TS_START * TS_CLOCK;
}
static double get_pcr_double( ts_writer_t *w, double offset )
{
return (8.0 * (w->packets_written * TS_PACKET_SIZE + offset) / w->ts_muxrate) + TS_START;
}
/**** Buffer management ****/
static void add_to_buffer( buffer_t *buffer )
{
buffer->cur_buf += TS_PACKET_SIZE * 8;
}
static void drip_buffer( ts_writer_t *w, ts_int_program_t *program, int rx, buffer_t *buffer, double next_pcr )
{
int iters;
double offset;
/* Although this uses floating point arithmetic, the values are backed by integers
* Transport buffer fullness does not need to be exact */
double cur_pcr = get_pcr_double( w, 0 );
if( buffer->last_byte_removal_time == 0.0 )
{
buffer->last_byte_removal_time = cur_pcr;
buffer->cur_buf -= 8;
}
iters = floor( (next_pcr - buffer->last_byte_removal_time) / (8.0 / rx) );
buffer->cur_buf -= 8*iters;
/* Avoid compounded error from floating point addition by making calculations relative to next_pcr */
offset = next_pcr - (buffer->last_byte_removal_time + 8.0 * iters / rx);
buffer->last_byte_removal_time = next_pcr - offset;
buffer->cur_buf = MAX( buffer->cur_buf, 0 );
}
static int write_adaptation_field( ts_writer_t *w, bs_t *s, ts_int_program_t *program, ts_int_pes_t *pes,
int write_pcr, int flags, int stuffing, int discontinuity )
{
int private_data_flag, write_dvb_au, random_access, priority;
int start = bs_pos( s );
uint8_t temp[512], temp2[256];
bs_t q, r;
private_data_flag = write_dvb_au = random_access = priority = 0;
if( pes && ( pes->data == pes->cur_pos ) )
{
ts_int_stream_t *stream = pes->stream;
random_access = pes->random_access;
if( IS_VIDEO( stream ) )
{
if( !write_pcr )
random_access = 0;
if( stream->dvb_au )
private_data_flag = write_dvb_au = 1;
}
priority = pes->priority;
pes->random_access = 0; /* don't write this flag again */
}
/* initialise temporary bitstream */
bs_init( &q, temp, 256 );
if( flags )
{
int64_t pcr = get_pcr_int( w, 7 ); /* 7 bytes until end of PCR field */
bs_write1( &q, discontinuity ); // discontinuity_indicator
bs_write1( &q, random_access ); // random_access_indicator
bs_write1( &q, priority ); // elementary_stream_priority_indicator
bs_write1( &q, write_pcr ); // PCR_flag
bs_write1( &q, 0 ); // OPCR_flag
bs_write1( &q, 0 ); // splicing_point_flag
bs_write1( &q, private_data_flag ); // transport_private_data_flag
bs_write1( &q, 0 ); // adaptation_field_extension_flag
if( write_pcr )
{
uint64_t base, extension;
int64_t mod = (int64_t)1 << 33;
program->last_pcr = pcr;
base = (pcr / 300) % mod;
extension = pcr % 300;
// program_clock_reference_base
bs_write32( &q, base >> 1 );
bs_write1( &q, (base & 1) );
// reserved
bs_write( &q, 6, 0x3f );
// program_clock_reference_extension
bs_write( &q, 8, (extension >> 1) & 0xff );
bs_write1( &q, (extension & 1 ) );
}
}
if( private_data_flag )
{
/* initialise another temporary bitstream */
bs_init( &r, temp2, 128 );
if( write_dvb_au )
write_dvb_au_information( &r, pes );
bs_flush ( &r );
bs_write( &q, 8, bs_pos( &r ) >> 3 ); // transport_private_data_length
write_bytes( &q, temp2, bs_pos( &r ) >> 3 );
}
for( int i = 0; i < stuffing; i++ )
bs_write( &q, 8, 0xff );
bs_flush( &q );
bs_write( s, 8, bs_pos( &q ) >> 3 ); // adaptation_field_length
write_bytes( s, temp, bs_pos( &q ) >> 3 );
return (bs_pos( s ) - start) >> 3;
}
static int write_pcr_empty( ts_writer_t *w, ts_int_program_t *program, int first )
{
bs_t *s = &w->out.bs;
write_packet_header( w, s, 0, program->pcr_stream->pid, ADAPT_FIELD_ONLY, &program->pcr_stream->cc );
int stuffing = 184 - 6 - 2; /* pcr, flags and length */
write_adaptation_field( w, s, program, NULL, 1, 1, stuffing, first );
add_to_buffer( &program->pcr_stream->tb );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
return 0;
}
/**** PSI ****/
static int write_pat( ts_writer_t *w )
{
int start;
bs_t *s = &w->out.bs;
write_packet_header( w, s, 1, PAT_PID, PAYLOAD_ONLY, &w->pat_cc );
bs_write( s, 8, 0 ); // pointer field
start = bs_pos( s );
bs_write( s, 8, PAT_TID ); // table_id
bs_write1( s, 1 ); // section_syntax_indicator
bs_write1( s, 0 ); // '0'
bs_write( s, 2, 0x03 ); // reserved`
// FIXME when multiple programs are allowed do this properly
int section_length = w->num_programs * 4 + w->network_pid * 4 + 9;
bs_write( s, 12, section_length & 0x3ff );
bs_write( s, 16, w->ts_id & 0xffff ); // transport_stream_id
bs_write( s, 2, 0x03 ); // reserved
bs_write( s, 5, w->pat_version ); // version_number
bs_write1( s, 1 ); // current_next_indicator
bs_write( s, 8, 0 ); // section_number
bs_write( s, 8, 0 ); // last_section_number
if( w->network_pid )
{
bs_write( s, 16, 0 ); // program_number
bs_write( s, 3, 0x07 ); // reserved
bs_write( s, 13, w->network_pid & 0x1fff ); // network_PID
}
for( int i = 0; i < w->num_programs; i++ )
{
bs_write( s, 16, w->programs[i]->program_num & 0xffff ); // program_number
bs_write( s, 3, 0x07 ); // reserved
bs_write( s, 13, w->programs[i]->pmt.pid & 0x1fff ); // program_map_PID
}
bs_flush( s );
write_crc( s, start );
// -40 to include header and pointer field
write_padding( s, start - 40 );
add_to_buffer( &w->tb );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
return 0;
}
static int eject_queued_pmt( ts_writer_t *w, ts_int_program_t *program, bs_t *s )
{
uint8_t **temp;
write_bytes( s, program->pmt_packets[0], TS_PACKET_SIZE );
if( program->num_queued_pmt > 1 )
memmove( &program->pmt_packets[0], &program->pmt_packets[1], (program->num_queued_pmt-1) * sizeof(uint8_t*) );
temp = realloc( program->pmt_packets, (program->num_queued_pmt-1) * sizeof(uint8_t*) );
if( !temp )
{
fprintf( stderr, "malloc failed\n" );
return -1;
}
program->pmt_packets = temp;
program->num_queued_pmt--;
add_to_buffer( &w->tb );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
return 0;
};
static int write_pmt( ts_writer_t *w, ts_int_program_t *program )
{
int start;
bs_t *s = &w->out.bs;
uint8_t pmt_buf[2048] = {0}, temp[2048] = {0}, temp1[2048] = {0};
bs_t o, p, q;
int section_length;
uint8_t **temp2;
/* this should never happen */
if( program->num_queued_pmt )
return eject_queued_pmt( w, program, s );
start = bs_pos( s );
write_packet_header( w, s, 1, program->pmt.pid, PAYLOAD_ONLY, &program->pmt.cc );
bs_write( s, 8, 0 ); // pointer field
bs_init( &o, pmt_buf, 2048 );
bs_write( &o, 8, PMT_TID ); // table_id = program_map_section
bs_write1( &o, 1 ); // section_syntax_indicator
bs_write1( &o, 0 ); // '0'
bs_write( &o, 2, 0x3 ); // reserved
bs_init( &p, temp, 2048 );
bs_write( &p, 16, program->program_num & 0xffff ); // program_number
bs_write( &p, 2, 0x3 ); // reserved
bs_write( &p, 5, program->pmt_version ); // version_number
bs_write1( &p, 1 ); // current_next_indicator
bs_write( &p, 8, 0 ); // section_number
bs_write( &p, 8, 0 ); // last_section_number
bs_write( &p, 3, 0x7 ); // reserved
bs_write( &p, 13, program->pcr_stream[0].pid & 0x1fff ); // PCR PID
bs_write( &p, 4, 0xf ); // reserved
/* setup temporary bitstream context */
bs_init( &q, temp1, 2048 );
if( w->ts_type == TS_TYPE_ATSC )
{
write_registration_descriptor( &q, REGISTRATION_DESCRIPTOR_TAG, 4, "GA94" );
write_smoothing_buffer_descriptor( &q, program );
}
else if( w->ts_type == TS_TYPE_CABLELABS )
{
write_registration_descriptor( &q, REGISTRATION_DESCRIPTOR_TAG, 4, "SCTE" );
if( program->is_3dtv )
write_cablelabs_3d_descriptor( &q );
}
else if( w->ts_type == TS_TYPE_BLU_RAY )
write_registration_descriptor( &q, REGISTRATION_DESCRIPTOR_TAG, 4, "HDMV" );
/* Optional descriptor(s) here */
bs_flush( &q );
bs_write( &p, 12, bs_pos( &q ) >> 3 ); // program_info_length
write_bytes( &p, temp1, bs_pos( &q ) >> 3 );
for( int i = 0; i < program->num_streams; i++ )
{
ts_int_stream_t *stream = program->streams[i];
bs_write( &p, 8, stream->stream_type & 0xff ); // stream_type
bs_write( &p, 3, 0x7 ); // reserved
bs_write( &p, 13, stream->pid & 0x1fff ); // elementary_PID
bs_write( &p, 4, 0xf ); // reserved
/* reset temporary bitstream context for streams loop */
bs_init( &q, temp1, 512 );
if( stream->stream_format != LIBMPEGTS_ANCILLARY_RDD11 )
write_data_stream_alignment_descriptor( &q );
if( stream->dvb_au )
{
if( w->ts_type == TS_TYPE_DVB )
write_adaptation_field_data_descriptor( &q, AU_INFORMATION_DATA_FIELD );
else if( w->ts_type == TS_TYPE_CABLELABS )
write_scte_adaptation_descriptor( &q );
}
if( stream->write_lang_code )
write_iso_lang_descriptor( &q, stream );
if( stream->has_stream_identifier )
write_stream_identifier_descriptor( &q, stream->stream_identifier );
if( stream->stream_format == LIBMPEGTS_VIDEO_MPEG2 )
{
if( w->ts_type == TS_TYPE_BLU_RAY )
write_hdmv_video_registration_descriptor( &q, stream );
}
else if( stream->stream_format == LIBMPEGTS_VIDEO_AVC )
{
write_avc_descriptor( &q, program, stream );
if( w->ts_type == TS_TYPE_BLU_RAY )
write_hdmv_video_registration_descriptor( &q, stream );
}
else if( stream->stream_format == LIBMPEGTS_AUDIO_MPEG1 ||
stream->stream_format == LIBMPEGTS_AUDIO_MPEG2 )
{
// TODO
}
else if( stream->stream_format == LIBMPEGTS_AUDIO_ADTS || stream->stream_format == LIBMPEGTS_AUDIO_LATM )
{
/* strictly speaking in DVB only LATM is allowed for MPEG-4 AAC audio. ADTS is commonly used however */
if( !stream->aac_is_mpeg4 )
write_mpeg2_aac_descriptor( &q, stream );
else if( w->ts_type == TS_TYPE_DVB )
write_aac_descriptor( &q, stream );
}
else if( stream->stream_format == LIBMPEGTS_AUDIO_AC3 )
{
write_registration_descriptor( &q, REGISTRATION_DESCRIPTOR_TAG, 4, "AC-3" );
if( stream->atsc_ac3_ctx && ( w->ts_type == TS_TYPE_ATSC || w->ts_type == TS_TYPE_CABLELABS ) )
write_atsc_ac3_descriptor( &q, stream->atsc_ac3_ctx );
else
write_ac3_descriptor( w, &q, 0 );
}
else if( stream->stream_format == LIBMPEGTS_AUDIO_EAC3 || stream->stream_format == LIBMPEGTS_AUDIO_EAC3_SECONDARY )
write_ac3_descriptor( w, &q, 1 );
else if( stream->stream_format == LIBMPEGTS_AUDIO_DTS )
{
// TODO
}
else if( stream->stream_format == LIBMPEGTS_AUDIO_302M )
write_registration_descriptor( &q, PRIVATE_DATA_DESCRIPTOR_TAG, 4, "BSSD" );
else if( stream->stream_format == LIBMPEGTS_DVB_SUB )
write_dvb_subtitling_descriptor( &q, stream );
else if( stream->stream_format == LIBMPEGTS_DVB_TELETEXT )
write_teletext_descriptor( &q, stream, 0 );
else if( stream->stream_format == LIBMPEGTS_DVB_VBI )
{
write_vbi_descriptor( &q, stream );
if( stream->num_dvb_ttx )
write_teletext_descriptor( &q, stream, 1 );
}
else if( stream->stream_format == LIBMPEGTS_ANCILLARY_RDD11 )
write_registration_descriptor( &q, PRIVATE_DATA_DESCRIPTOR_TAG, 4, "LU-A" );
else if( stream->stream_format == LIBMPEGTS_ANCILLARY_2038 )
{
write_registration_descriptor( &q, PRIVATE_DATA_DESCRIPTOR_TAG, 4, "VANC" );
write_anc_data_descriptor( &q );
}
// TODO other stream_type descriptors
/* Optional descriptor(s) here */
bs_flush( &q );
bs_write( &p, 12, bs_pos( &q ) >> 3 ); // ES_info_length
write_bytes( &p, temp1, bs_pos( &q ) >> 3 );
}
/* section length includes crc */
section_length = (bs_pos( &p ) >> 3) + 4;
bs_write( &o, 12, section_length & 0x3ff );
/* write main chunk into pmt array */
bs_flush( &p );
write_bytes( &o, temp, bs_pos( &p ) >> 3 );
/* take crc of the whole program map section */
bs_flush( &o );
write_crc( &o, 0 );
int length = bs_pos( &o ) >> 3;
int bytes_left = TS_PACKET_SIZE - ((bs_pos( s ) - start) >> 3);
bs_flush( &o );
write_bytes( s, pmt_buf, MIN( bytes_left, length ) );
bs_flush( s );
write_padding( s, start );
add_to_buffer( &w->tb );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
int pos = MIN( bytes_left, length );
length -= pos;
bytes_left = 184;
/* queue up pmt packets for spaced output */
while( length > 0 )
{
bs_t z;
temp2 = realloc( program->pmt_packets, (program->num_queued_pmt + 1) * sizeof(uint8_t*));
if( !temp2 )
{
fprintf( stderr, "malloc failed" );
return -1;
}
program->pmt_packets = temp2;
program->pmt_packets[program->num_queued_pmt] = malloc( TS_PACKET_SIZE );
if( !program->pmt_packets[program->num_queued_pmt] )
{
fprintf( stderr, "malloc failed" );
return -1;
}
bs_init( &z, program->pmt_packets[program->num_queued_pmt], 188 );
write_packet_header( w, &z, 0, program->pmt.pid, PAYLOAD_ONLY, &program->pmt.cc );
write_bytes( &z, &temp[pos], MIN( bytes_left, length ) );
bs_flush( &z );
write_padding( &z, 0 );
pos += MIN( bytes_left, length );
length -= MIN( bytes_left, length );
program->num_queued_pmt++;
}
return 0;
}
static void retransmit_psi_and_si( ts_writer_t *w, ts_int_program_t *program, int first )
{
// TODO make this work with multiple programs
int64_t cur_pcr = get_pcr_int( w, 0 );
if( cur_pcr - w->last_pat >= w->pat_period * 27000LL || first )
{
/* Although it is not in line with the mux strategy it is good practice to write PAT and PMT together */
w->last_pat = cur_pcr;
write_pat( w ); // FIXME handle failure
write_pmt( w, program ); // FIXME handle failure
}
cur_pcr = get_pcr_int( w, 0 );
if( w->sdt && ( cur_pcr - w->last_sdt >= w->sdt_period * 27000LL || first ) )
{
w->last_sdt = cur_pcr;
write_sdt( w );
}
}
/* DVB / Blu-Ray Service Information */
static int write_sit( ts_writer_t *w )
{
int start;
int len = 0; // FIXME
bs_t *s = &w->out.bs;
write_packet_header( w, s, 1, SIT_PID, PAYLOAD_ONLY, &w->sit->cc );
bs_write( s, 8, 0 ); // pointer field
start = bs_pos( s );
bs_write( s, 8, SIT_TID ); // table_id
bs_write1( s, 1 ); // section_syntax_indicator
bs_write1( s, 1 ); // DVB_reserved_future_use
bs_write( s, 2, 0x03 ); // ISO_reserved
// FIXME do length properly
bs_write( s, 12, 11 + len ); // section_length
bs_write( s, 16, 0xffff ); // DVB_reserved_future_use
bs_write( s, 2, 0x03 ); // ISO_reserved
bs_write( s, 5, w->sit->version_number ); // version_number
bs_write1( s, 1 ); // current_next_indicator
bs_write( s, 8, 0 ); // section_number
bs_write( s, 8, 0 ); // last_section_number
bs_write( s, 4, 0x0f ); // DVB_reserved_for_future_use
bs_write( s, 12, len ); // transmission_info_loop_length
if( w->ts_type == TS_TYPE_BLU_RAY )
write_partial_ts_descriptor( w, s );
for( int i = 0; i < w->num_programs; i++ )
{
bs_write( s, 16, w->programs[i]->program_num & 0xffff ); // service_id (equivalent to program_number)
bs_write1( s, 1 ); // DVB_reserved_future_use
bs_write( s, 3, 0x07 ); // running_status
bs_write( s, 12, 0 ); // service_loop_length
}
bs_flush( s );
write_crc( s, start );
// -40 to include header and pointer field
write_padding( s, start - 40 );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
return 0;
}
static void write_timestamp( bs_t *s, uint64_t timestamp )
{
bs_write( s, 3, (timestamp >> 30) & 0x07 ); // timestamp [32..30]
bs_write1( s, 1 ); // marker_bit
bs_write( s, 8, (timestamp >> 22) & 0xff ); // timestamp [29..15]
bs_write( s, 7, (timestamp >> 15) & 0x7f ); // timestamp [29..15]
bs_write1( s, 1 ); // marker_bit
bs_write( s, 8, (timestamp >> 7) & 0xff ); // timestamp [14..0]
bs_write( s, 7, timestamp & 0x7f ); // timestamp [14..0]
bs_write1( s, 1 ); // marker_bit
}
static int write_pes( ts_writer_t *w, ts_int_program_t *program, ts_frame_t *in_frame, ts_int_pes_t *out_pes )
{
bs_t s, q;
uint8_t temp[1024];
int header_size, total_size;
int64_t mod = (int64_t)1 << 33;
if( out_pes->dts > out_pes->pts )
fprintf( stderr, "\nError: DTS > PTS\n" );
bs_init( &s, out_pes->data, in_frame->size + 200 );
ts_int_stream_t *stream = out_pes->stream;
bs_write( &s, 24, 1 ); // packet_start_code_prefix
bs_write( &s, 8, stream->stream_id ); // stream_id
/* Initialise temp buffer */
bs_init( &q, temp, 1024 );
bs_write( &q, 2, 0x2 ); // '10'
bs_write( &q, 2, 0 ); // PES_scrambling_control
bs_write1( &q, 0 ); // PES_priority
bs_write1( &q, stream->stream_format != LIBMPEGTS_ANCILLARY_RDD11 ); // data_alignment_indicator
bs_write1( &q, 1 ); // copyright
bs_write1( &q, 1 ); // original_or_copy
int same_timestamps = out_pes->dts == out_pes->pts;
bs_write( &q, 2, 0x02 + !same_timestamps ); // pts_dts_flags
bs_write1( &q, 0 ); // ESCR_flag
bs_write1( &q, 0 ); // ES_rate_flag
bs_write1( &q, 0 ); // DSM_trick_mode_flag
bs_write1( &q, 0 ); // additional_copy_info_flag
bs_write1( &q, 0 ); // PES_CRC_flag
bs_write1( &q, 0 ); // PES_extension_flag
if( stream->stream_format == LIBMPEGTS_DVB_TELETEXT || stream->stream_format == LIBMPEGTS_DVB_VBI )
bs_write( &q, 8, 0x24 ); // PES_header_data_length
else if( same_timestamps )
bs_write( &q, 8, 0x05 ); // PES_header_data_length (PTS only)
else
bs_write( &q, 8, 0x0a ); // PES_header_data_length (PTS and DTS)
bs_write( &q, 4, 0x02 + !same_timestamps ); // '0010' or '0011'
write_timestamp( &q, out_pes->pts % mod ); // PTS
if( !same_timestamps )
{
bs_write( &q, 4, 1 ); // '0001'
write_timestamp( &q, out_pes->dts % mod ); // DTS
}
/* TTX and VBI require extra stuffing */
if( stream->stream_format == LIBMPEGTS_DVB_TELETEXT || stream->stream_format == LIBMPEGTS_DVB_VBI )
{
/* Total PES header is 45 bytes but don't count 6 bytes for the startcode, stream_id and length */
int num_stuffing = 45 - 6 - (bs_pos( &q ) >> 3);
for( int i = 0; i < num_stuffing; i++ )
bs_write( &q, 8, 0xff );
}
bs_flush( &q );
total_size = in_frame->size + (bs_pos( &q ) >> 3);
if( stream->stream_format == LIBMPEGTS_VIDEO_MPEG2 || stream->stream_format == LIBMPEGTS_VIDEO_AVC )
bs_write( &s, 16, 0 ); // PES_packet_length
else
bs_write( &s, 16, total_size ); // PES_packet_length
write_bytes( &s, temp, bs_pos( &q ) >> 3 );
header_size = bs_pos( &s ) >> 3;
write_bytes( &s, in_frame->data, in_frame->size );
bs_flush( &s );
out_pes->size = out_pes->bytes_left = bs_pos( &s ) >> 3;
out_pes->cur_pos = out_pes->data;
return header_size;
}
static int write_null_packet( ts_writer_t *w )
{
int start;
int cc = 0;
bs_t *s = &w->out.bs;
start = bs_pos( s );
write_packet_header( w, s, 0, NULL_PID, PAYLOAD_ONLY, &cc );
write_padding( s, start );
if( increase_pcr( w, 1, 0 ) < 0 )
return -1;
return 0;
}
static int check_bitstream( ts_writer_t *w )
{
if( w->out.bs.p_end - w->out.bs.p < 18800 )
{
bs_flush( &w->out.bs );
uint8_t *bs_bak = w->out.p_bitstream;
w->out.i_bitstream += 100000;
uint8_t *temp2 = realloc( w->out.p_bitstream, w->out.i_bitstream );
if( !temp2 )
{
fprintf( stderr, "realloc failed\n" );
return -1;
}
w->out.p_bitstream = temp2;
intptr_t delta = w->out.p_bitstream - bs_bak;
w->out.bs.p_start += delta;
w->out.bs.p += delta;
w->out.bs.p_end = w->out.p_bitstream + w->out.i_bitstream;
bs_realign( &w->out.bs );
}
return 0;
}
ts_writer_t *ts_create_writer( void )
{
ts_writer_t *w = calloc( 1, sizeof(*w) );
if( !w )
{
fprintf( stderr, "Malloc failed\n" );
return NULL;
}
return w;
}
int ts_setup_transport_stream( ts_writer_t *w, ts_main_t *params )
{
// TODO check for PID collisions, add MPTS support
if( params->ts_type < TS_TYPE_GENERIC || params->ts_type > TS_TYPE_BLU_RAY )
{
fprintf( stderr, "Invalid Transport Stream type.\n" );
return -1;
}
if( params->num_programs > 1 )
{
fprintf( stderr, "Multiple program transport streams are not yet supported.\n" );
return -1;
}
if( !params->cbr && params->num_programs > 1 )
{
fprintf( stderr, "Multiple program transport streams cannot be variable bitrate.\n" );
return -1;
}
if( params->network_pid && ( params->network_pid < 0x10 || params->network_pid == 0x1fff ) )
{
fprintf( stderr, "Invalid network_PID.\n" );
return -1;
}
if( !params->muxrate )
{
fprintf( stderr, "Muxrate must be nonzero\n" );
return -1;
}
BOOLIFY( params->cbr );
BOOLIFY( params->legacy_constraints );
int internal_pcr_pid, video_stream;
internal_pcr_pid = video_stream = 0;
ts_int_program_t *cur_program = calloc( 1, sizeof(*cur_program) );
if( !cur_program )
{
fprintf( stderr, "Malloc failed\n" );
return -1;
}
w->num_programs = 1;
w->programs[0] = cur_program;
cur_program->pmt.pid = params->programs[0].pmt_pid;
cur_program->program_num = params->programs[0].program_num;
cur_program->is_3dtv = params->programs[0].is_3dtv;
cur_program->sb_leak_rate = params->programs[0].sb_leak_rate;
cur_program->sb_size = params->programs[0].sb_size;
cur_program->video_dts = -1;
cur_program->sdt_ctx.service_type = params->programs[0].sdt.service_type;
if( params->programs[0].sdt.service_name )
{
cur_program->sdt_ctx.service_name = malloc( strlen( params->programs[0].sdt.service_name ) + 1 );
if( !cur_program->sdt_ctx.service_name )
{
fprintf( stderr, "Malloc failed\n" );
return -1;
}
strcpy( cur_program->sdt_ctx.service_name, params->programs[0].sdt.service_name );
}
if( params->programs[0].sdt.provider_name )
{
cur_program->sdt_ctx.provider_name = malloc( strlen( params->programs[0].sdt.provider_name ) + 1 );
if( !cur_program->sdt_ctx.provider_name )
{
fprintf( stderr, "Malloc failed\n" );
return -1;
}
strcpy( cur_program->sdt_ctx.provider_name, params->programs[0].sdt.provider_name );
}
for( int i = 0; i < params->programs[0].num_streams; i++ )
{
ts_stream_t *stream_in = ¶ms->programs[0].streams[i];
if( stream_in->stream_format == LIBMPEGTS_VIDEO_MPEG2 || stream_in->stream_format == LIBMPEGTS_VIDEO_AVC )
{
if( !video_stream )
video_stream = 1;
else
{
fprintf( stderr, "Multiple video streams not allowed\n" );
return -1;
}
}
ts_int_stream_t *cur_stream = calloc( 1, sizeof(*cur_stream) );
if( !cur_stream )
{
fprintf( stderr, "Malloc failed\n" );
return -1;
}
cur_stream->pid = stream_in->pid;
cur_stream->stream_format = stream_in->stream_format;
for( int j = 0; steam_type_table[j][0] != 0; j++ )
{
if( cur_stream->stream_format == steam_type_table[j][0] )
{
/* DVB AC-3 and EAC-3 are different */
if( w->ts_type == TS_TYPE_DVB &&
( cur_stream->stream_format == LIBMPEGTS_AUDIO_AC3 || cur_stream->stream_format == LIBMPEGTS_AUDIO_EAC3 ) )
j++;
cur_stream->stream_type = steam_type_table[j][1];
break;
}
}
if( !cur_stream->stream_type )
{
fprintf( stderr, "Unsupported Stream Format\n" );
free( cur_stream );
return -1;
}
if( stream_in->write_lang_code )
{
cur_stream->write_lang_code = 1;
memcpy( cur_stream->lang_code, stream_in->lang_code, 4 );
}
cur_stream->audio_type = stream_in->audio_type;
if( cur_stream->pid == params->programs[0].pcr_pid )