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|
/*****************************************************************
|
| AP4 - MPEG2 Transport Streams
|
| Copyright 2002-2015 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL 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, or (at your option)
| any later version.
|
| Bento4|GPL 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 Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "Ap4Mpeg2Ts.h"
#include "Ap4ByteStream.h"
#include "Ap4Sample.h"
#include "Ap4SampleDescription.h"
#include "Ap4Utils.h"
#include "Ap4Mp4AudioInfo.h"
#include "Ap4AvcParser.h"
/*----------------------------------------------------------------------
| constants
+---------------------------------------------------------------------*/
const unsigned int AP4_MPEG2TS_PACKET_SIZE = 188;
const unsigned int AP4_MPEG2TS_PACKET_PAYLOAD_SIZE = 184;
const unsigned int AP4_MPEG2TS_SYNC_BYTE = 0x47;
const unsigned int AP4_MPEG2TS_PCR_ADAPTATION_SIZE = 6;
static unsigned char const StuffingBytes[AP4_MPEG2TS_PACKET_SIZE] =
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF
};
const unsigned int AP4_HEVC_NALU_TYPE_VPS_NUT = 32;
const unsigned int AP4_HEVC_NALU_TYPE_SPS_NUT = 33;
const unsigned int AP4_HEVC_NALU_TYPE_PPS_NUT = 34;
/*----------------------------------------------------------------------
| GetSamplingFrequencyIndex
+---------------------------------------------------------------------*/
static unsigned int
GetSamplingFrequencyIndex(unsigned int sampling_frequency)
{
switch (sampling_frequency) {
case 96000: return 0;
case 88200: return 1;
case 64000: return 2;
case 48000: return 3;
case 44100: return 4;
case 32000: return 5;
case 24000: return 6;
case 22050: return 7;
case 16000: return 8;
case 12000: return 9;
case 11025: return 10;
case 8000: return 11;
case 7350: return 12;
default: return 0;
}
}
/*----------------------------------------------------------------------
| MakeAdtsHeader
+---------------------------------------------------------------------*/
static void
MakeAdtsHeader(unsigned char bits[7],
unsigned int frame_size,
unsigned int sampling_frequency_index,
unsigned int channel_configuration)
{
bits[0] = 0xFF;
bits[1] = 0xF1; // 0xF9 (MPEG2)
bits[2] = (AP4_UI08)(0x40 | (sampling_frequency_index << 2) | (channel_configuration >> 2));
bits[3] = (AP4_UI08)(((channel_configuration&0x3)<<6) | ((frame_size+7) >> 11));
bits[4] = ((frame_size+7) >> 3)&0xFF;
bits[5] = (((frame_size+7) << 5)&0xFF) | 0x1F;
bits[6] = 0xFC;
/*
0: syncword 12 always: '111111111111'
12: ID 1 0: MPEG-4, 1: MPEG-2
13: layer 2 always: '00'
15: protection_absent 1
16: profile 2
18: sampling_frequency_index 4
22: private_bit 1
23: channel_configuration 3
26: original/copy 1
27: home 1
28: emphasis 2 only if ID == 0
ADTS Variable header: these can change from frame to frame
28: copyright_identification_bit 1
29: copyright_identification_start 1
30: aac_frame_length 13 length of the frame including header (in bytes)
43: adts_buffer_fullness 11 0x7FF indicates VBR
54: no_raw_data_blocks_in_frame 2
ADTS Error check
crc_check 16 only if protection_absent == 0
*/
}
/*----------------------------------------------------------------------
| CRC_Table
+---------------------------------------------------------------------*/
static AP4_UI32
const CRC_Table[256] = {
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
/*----------------------------------------------------------------------
| ComputeCRC
+---------------------------------------------------------------------*/
static AP4_UI32
ComputeCRC(const unsigned char* data, unsigned int data_size)
{
AP4_UI32 crc = 0xFFFFFFFF;
for (unsigned int i=0; i<data_size; i++) {
crc = (crc << 8) ^ CRC_Table[((crc >> 24) ^ *data++) & 0xFF];
}
return crc;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::Stream::WritePacketHeader
+---------------------------------------------------------------------*/
void
AP4_Mpeg2TsWriter::Stream::WritePacketHeader(bool payload_start,
unsigned int& payload_size,
bool with_pcr,
AP4_UI64 pcr,
AP4_ByteStream& output)
{
unsigned char header[4];
header[0] = AP4_MPEG2TS_SYNC_BYTE;
header[1] = (AP4_UI08)(((payload_start?1:0)<<6) | (m_PID >> 8));
header[2] = m_PID & 0xFF;
unsigned int adaptation_field_size = 0;
if (with_pcr) adaptation_field_size += 2+AP4_MPEG2TS_PCR_ADAPTATION_SIZE;
// clamp the payload size
if (payload_size+adaptation_field_size > AP4_MPEG2TS_PACKET_PAYLOAD_SIZE) {
payload_size = AP4_MPEG2TS_PACKET_PAYLOAD_SIZE-adaptation_field_size;
}
// adjust the adaptation field to include stuffing if necessary
if (adaptation_field_size+payload_size < AP4_MPEG2TS_PACKET_PAYLOAD_SIZE) {
adaptation_field_size = AP4_MPEG2TS_PACKET_PAYLOAD_SIZE-payload_size;
}
if (adaptation_field_size == 0) {
// no adaptation field
header[3] = (1<<4) | ((m_ContinuityCounter++)&0x0F);
output.Write(header, 4);
} else {
// adaptation field present
header[3] = (3<<4) | ((m_ContinuityCounter++)&0x0F);
output.Write(header, 4);
if (adaptation_field_size == 1) {
// just one byte (stuffing)
output.WriteUI08(0);
} else {
// two or more bytes (stuffing and/or PCR)
output.WriteUI08((AP4_UI08)(adaptation_field_size-1));
output.WriteUI08(with_pcr?(1<<4):0);
unsigned int pcr_size = 0;
if (with_pcr) {
pcr_size = AP4_MPEG2TS_PCR_ADAPTATION_SIZE;
AP4_UI64 pcr_base = pcr/300;
AP4_UI32 pcr_ext = (AP4_UI32)(pcr%300);
AP4_BitWriter writer(pcr_size);
writer.Write((AP4_UI32)(pcr_base>>32), 1);
writer.Write((AP4_UI32)pcr_base, 32);
writer.Write(0x3F, 6);
writer.Write(pcr_ext, 9);
output.Write(writer.GetData(), pcr_size);
}
if (adaptation_field_size > 2) {
output.Write(StuffingBytes, adaptation_field_size-pcr_size-2);
}
}
}
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::SampleStream::WritePES
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::SampleStream::WritePES(const unsigned char* data,
unsigned int data_size,
AP4_UI64 dts,
bool with_dts,
AP4_UI64 pts,
bool with_pcr,
AP4_ByteStream& output)
{
unsigned int pes_header_size = 14+(with_dts?5:0);
AP4_BitWriter pes_header(pes_header_size);
// adjust the base timestamp so we don't start at 0
// dts += 10000;
// pts += 10000;
pes_header.Write(0x000001, 24); // packet_start_code_prefix
pes_header.Write(m_StreamId, 8); // stream_id
pes_header.Write(m_StreamId == AP4_MPEG2_TS_DEFAULT_STREAM_ID_VIDEO?0:(data_size+pes_header_size-6), 16); // PES_packet_length
pes_header.Write(2, 2); // '01'
pes_header.Write(0, 2); // PES_scrambling_control
pes_header.Write(0, 1); // PES_priority
pes_header.Write(1, 1); // data_alignment_indicator
pes_header.Write(0, 1); // copyright
pes_header.Write(0, 1); // original_or_copy
pes_header.Write(with_dts?3:2, 2); // PTS_DTS_flags
pes_header.Write(0, 1); // ESCR_flag
pes_header.Write(0, 1); // ES_rate_flag
pes_header.Write(0, 1); // DSM_trick_mode_flag
pes_header.Write(0, 1); // additional_copy_info_flag
pes_header.Write(0, 1); // PES_CRC_flag
pes_header.Write(0, 1); // PES_extension_flag
pes_header.Write(pes_header_size-9, 8);// PES_header_data_length
pes_header.Write(with_dts?3:2, 4); // '0010' or '0011'
pes_header.Write((AP4_UI32)(pts>>30), 3); // PTS[32..30]
pes_header.Write(1, 1); // marker_bit
pes_header.Write((AP4_UI32)(pts>>15), 15); // PTS[29..15]
pes_header.Write(1, 1); // marker_bit
pes_header.Write((AP4_UI32)pts, 15); // PTS[14..0]
pes_header.Write(1, 1); // market_bit
if (with_dts) {
pes_header.Write(1, 4); // '0001'
pes_header.Write((AP4_UI32)(dts>>30), 3); // DTS[32..30]
pes_header.Write(1, 1); // marker_bit
pes_header.Write((AP4_UI32)(dts>>15), 15); // DTS[29..15]
pes_header.Write(1, 1); // marker_bit
pes_header.Write((AP4_UI32)dts, 15); // DTS[14..0]
pes_header.Write(1, 1); // market_bit
}
bool first_packet = true;
data_size += pes_header_size; // add size of PES header
while (data_size) {
unsigned int payload_size = data_size;
if (payload_size > AP4_MPEG2TS_PACKET_PAYLOAD_SIZE) payload_size = AP4_MPEG2TS_PACKET_PAYLOAD_SIZE;
if (first_packet) {
WritePacketHeader(first_packet, payload_size, with_pcr, (with_dts?dts:pts)*300, output);
first_packet = false;
output.Write(pes_header.GetData(), pes_header_size);
output.Write(data, payload_size-pes_header_size);
data += payload_size-pes_header_size;
} else {
WritePacketHeader(first_packet, payload_size, false, 0, output);
output.Write(data, payload_size);
data += payload_size;
}
data_size -= payload_size;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsAudioSampleStream
+---------------------------------------------------------------------*/
class AP4_Mpeg2TsAudioSampleStream : public AP4_Mpeg2TsWriter::SampleStream
{
public:
static AP4_Result Create(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
AP4_Mpeg2TsWriter::SampleStream*& stream,
const AP4_UI08* descriptor,
AP4_Size descriptor_length);
AP4_Result WriteSample(AP4_Sample& sample,
AP4_DataBuffer& sample_data,
AP4_SampleDescription* sample_description,
bool with_pcr,
AP4_ByteStream& output);
private:
AP4_Mpeg2TsAudioSampleStream(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
const AP4_UI08* descriptor,
AP4_Size descriptor_length) :
AP4_Mpeg2TsWriter::SampleStream(pid,
stream_type,
stream_id,
timescale,
descriptor,
descriptor_length) {}
};
/*----------------------------------------------------------------------
| AP4_Mpeg2TsAudioSampleStream::Create
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsAudioSampleStream::Create(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
AP4_Mpeg2TsWriter::SampleStream*& stream,
const AP4_UI08* descriptor,
AP4_Size descriptor_length)
{
stream = new AP4_Mpeg2TsAudioSampleStream(pid, timescale, stream_type, stream_id, descriptor, descriptor_length);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsAudioSampleStream::WriteSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsAudioSampleStream::WriteSample(AP4_Sample& sample,
AP4_DataBuffer& sample_data,
AP4_SampleDescription* sample_description,
bool with_pcr,
AP4_ByteStream& output)
{
// check the sample description
if (sample_description->GetFormat() == AP4_SAMPLE_FORMAT_MP4A) {
AP4_MpegAudioSampleDescription* audio_desc = AP4_DYNAMIC_CAST(AP4_MpegAudioSampleDescription, sample_description);
if (audio_desc == NULL) return AP4_ERROR_NOT_SUPPORTED;
if (audio_desc->GetMpeg4AudioObjectType() != AP4_MPEG4_AUDIO_OBJECT_TYPE_AAC_LC &&
audio_desc->GetMpeg4AudioObjectType() != AP4_MPEG4_AUDIO_OBJECT_TYPE_AAC_MAIN &&
audio_desc->GetMpeg4AudioObjectType() != AP4_MPEG4_AUDIO_OBJECT_TYPE_SBR &&
audio_desc->GetMpeg4AudioObjectType() != AP4_MPEG4_AUDIO_OBJECT_TYPE_PS) {
return AP4_ERROR_NOT_SUPPORTED;
}
unsigned int sample_rate = audio_desc->GetSampleRate();
unsigned int channel_count = audio_desc->GetChannelCount();
const AP4_DataBuffer& dsi = audio_desc->GetDecoderInfo();
if (dsi.GetDataSize()) {
AP4_Mp4AudioDecoderConfig dec_config;
AP4_Result result = dec_config.Parse(dsi.GetData(), dsi.GetDataSize());
if (AP4_SUCCEEDED(result)) {
sample_rate = dec_config.m_SamplingFrequency;
channel_count = dec_config.m_ChannelCount;
}
}
unsigned int sampling_frequency_index = GetSamplingFrequencyIndex(sample_rate);
unsigned int channel_configuration = channel_count;
unsigned char* buffer = new unsigned char[7+sample_data.GetDataSize()];
MakeAdtsHeader(buffer, sample_data.GetDataSize(), sampling_frequency_index, channel_configuration);
AP4_CopyMemory(buffer+7, sample_data.GetData(), sample_data.GetDataSize());
AP4_UI64 ts = AP4_ConvertTime(sample.GetDts(), m_TimeScale, 90000);
WritePES(buffer, 7+sample.GetSize(), ts, false, ts, with_pcr, output);
delete[] buffer;
} else if (sample_description->GetFormat() == AP4_SAMPLE_FORMAT_AC_3 ||
sample_description->GetFormat() == AP4_SAMPLE_FORMAT_EC_3) {
AP4_UI64 ts = AP4_ConvertTime(sample.GetDts(), m_TimeScale, 90000);
WritePES(sample_data.GetData(), sample_data.GetDataSize(), ts, false, ts, with_pcr, output);
} else {
return AP4_ERROR_NOT_SUPPORTED;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsVideoSampleStream
+---------------------------------------------------------------------*/
class AP4_Mpeg2TsVideoSampleStream : public AP4_Mpeg2TsWriter::SampleStream
{
public:
static AP4_Result Create(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
AP4_Mpeg2TsWriter::SampleStream*& stream,
const AP4_UI08* descriptor,
AP4_Size descriptor_length);
AP4_Result WriteSample(AP4_Sample& sample,
AP4_DataBuffer& sample_data,
AP4_SampleDescription* sample_description,
bool with_pcr,
AP4_ByteStream& output);
private:
AP4_Mpeg2TsVideoSampleStream(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
const AP4_UI08* descriptor,
AP4_Size descriptor_size) :
AP4_Mpeg2TsWriter::SampleStream(pid,
stream_type,
stream_id,
timescale,
descriptor,
descriptor_size),
m_SampleDescriptionIndex(-1),
m_NaluLengthSize(0),
m_SamplesWritten(0) {}
int m_SampleDescriptionIndex;
AP4_DataBuffer m_Prefix;
unsigned int m_NaluLengthSize;
AP4_UI64 m_SamplesWritten;
};
/*----------------------------------------------------------------------
| AP4_Mpeg2TsVideoSampleStream::AP4_Mpeg2TsVideoSampleStream
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsVideoSampleStream::Create(AP4_UI16 pid,
AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
AP4_Mpeg2TsWriter::SampleStream*& stream,
const AP4_UI08* descriptor,
AP4_Size descriptor_length)
{
// create the stream object
stream = new AP4_Mpeg2TsVideoSampleStream(pid, timescale, stream_type, stream_id, descriptor, descriptor_length);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsVideoSampleStream::WriteSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsVideoSampleStream::WriteSample(AP4_Sample& sample,
AP4_DataBuffer& sample_data,
AP4_SampleDescription* sample_description,
bool with_pcr,
AP4_ByteStream& output)
{
if (sample_description->GetType() == AP4_SampleDescription::TYPE_AVC) {
// check the sample description
AP4_AvcSampleDescription* avc_desc = AP4_DYNAMIC_CAST(AP4_AvcSampleDescription, sample_description);
if (avc_desc == NULL) return AP4_ERROR_NOT_SUPPORTED;
if ((int)sample.GetDescriptionIndex() != m_SampleDescriptionIndex) {
m_SampleDescriptionIndex = (int)sample.GetDescriptionIndex();
m_NaluLengthSize = avc_desc->GetNaluLengthSize();
// make the SPS/PPS prefix
m_Prefix.SetDataSize(0);
for (unsigned int i=0; i<avc_desc->GetSequenceParameters().ItemCount(); i++) {
AP4_DataBuffer& buffer = avc_desc->GetSequenceParameters()[i];
unsigned int prefix_size = m_Prefix.GetDataSize();
m_Prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = m_Prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
for (unsigned int i=0; i<avc_desc->GetPictureParameters().ItemCount(); i++) {
AP4_DataBuffer& buffer = avc_desc->GetPictureParameters()[i];
unsigned int prefix_size = m_Prefix.GetDataSize();
m_Prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = m_Prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
} else if (sample_description->GetType() == AP4_SampleDescription::TYPE_HEVC) {
// check the sample description
AP4_HevcSampleDescription* hevc_desc = AP4_DYNAMIC_CAST(AP4_HevcSampleDescription, sample_description);
if (hevc_desc == NULL) return AP4_ERROR_NOT_SUPPORTED;
if ((int)sample.GetDescriptionIndex() != m_SampleDescriptionIndex) {
m_SampleDescriptionIndex = (int)sample.GetDescriptionIndex();
m_NaluLengthSize = hevc_desc->GetNaluLengthSize();
// make the VPS/SPS/PPS prefix
m_Prefix.SetDataSize(0);
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_VPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = m_Prefix.GetDataSize();
m_Prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = m_Prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_SPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = m_Prefix.GetDataSize();
m_Prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = m_Prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_PPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = m_Prefix.GetDataSize();
m_Prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = m_Prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
}
} else {
return AP4_ERROR_NOT_SUPPORTED;
}
// decide if we need to emit the prefix
bool emit_prefix = false;
if (sample.IsSync() || m_SamplesWritten == 0) {
emit_prefix = true;
}
// write the NAL units
const unsigned char* data = sample_data.GetData();
unsigned int data_size = sample_data.GetDataSize();
// allocate a buffer for the PES packet
AP4_DataBuffer pes_data;
// output all NALUs
for (unsigned int nalu_count = 0; data_size; nalu_count++) {
// sanity check
if (data_size < m_NaluLengthSize) break;
// get the next NAL unit
AP4_UI32 nalu_size;
if (m_NaluLengthSize == 1) {
nalu_size = *data++;
data_size--;
} else if (m_NaluLengthSize == 2) {
nalu_size = AP4_BytesToInt16BE(data);
data += 2;
data_size -= 2;
} else if (m_NaluLengthSize == 4) {
nalu_size = AP4_BytesToInt32BE(data);
data += 4;
data_size -= 4;
} else {
break;
}
if (nalu_size > data_size) break;
// check if we need to add a delimiter before the NALU
if (nalu_count == 0 && sample_description->GetType() == AP4_SampleDescription::TYPE_AVC) {
if (nalu_size != 2 || (data[0] & 0x1F) != AP4_AVC_NAL_UNIT_TYPE_ACCESS_UNIT_DELIMITER) {
// the first NAL unit is not an Access Unit Delimiter, we need to add one
unsigned char delimiter[6];
delimiter[0] = 0;
delimiter[1] = 0;
delimiter[2] = 0;
delimiter[3] = 1;
delimiter[4] = 9; // NAL type = Access Unit Delimiter;
delimiter[5] = 0xF0; // Slice types = ANY
pes_data.AppendData(delimiter, 6);
if (emit_prefix) {
pes_data.AppendData(m_Prefix.GetData(), m_Prefix.GetDataSize());
emit_prefix = false;
}
}
} else {
if (emit_prefix) {
pes_data.AppendData(m_Prefix.GetData(), m_Prefix.GetDataSize());
emit_prefix = false;
}
}
// add a start code before the NAL unit
unsigned char start_code[3];
start_code[0] = 0;
start_code[1] = 0;
start_code[2] = 1;
pes_data.AppendData(start_code, 3);
// add the NALU
pes_data.AppendData(data, nalu_size);
// for AVC streams that do start with a NAL unit delimiter, we need to add the prefix now
if (emit_prefix) {
pes_data.AppendData(m_Prefix.GetData(), m_Prefix.GetDataSize());
emit_prefix = false;
}
// move to the next NAL unit
data += nalu_size;
data_size -= nalu_size;
}
// compute the timestamp
AP4_UI64 dts = AP4_ConvertTime(sample.GetDts(), m_TimeScale, 90000);
AP4_UI64 pts = AP4_ConvertTime(sample.GetCts(), m_TimeScale, 90000);
// update counters
++m_SamplesWritten;
// write the packet
return WritePES(pes_data.GetData(), pes_data.GetDataSize(), dts, true, pts, with_pcr, output);
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::AP4_Mpeg2TsWriter
+---------------------------------------------------------------------*/
AP4_Mpeg2TsWriter::AP4_Mpeg2TsWriter(AP4_UI16 pmt_pid) :
m_Audio(NULL),
m_Video(NULL)
{
m_PAT = new Stream(0);
m_PMT = new Stream(pmt_pid);
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::~AP4_Mpeg2TsWriter
+---------------------------------------------------------------------*/
AP4_Mpeg2TsWriter::~AP4_Mpeg2TsWriter()
{
delete m_PAT;
delete m_PMT;
delete m_Audio;
delete m_Video;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::WritePAT
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::WritePAT(AP4_ByteStream& output)
{
unsigned int payload_size = AP4_MPEG2TS_PACKET_PAYLOAD_SIZE;
m_PAT->WritePacketHeader(true, payload_size, false, 0, output);
AP4_BitWriter writer(1024);
writer.Write(0, 8); // pointer
writer.Write(0, 8); // table_id
writer.Write(1, 1); // section_syntax_indicator
writer.Write(0, 1); // '0'
writer.Write(3, 2); // reserved
writer.Write(13, 12);// section_length
writer.Write(1, 16); // transport_stream_id
writer.Write(3, 2); // reserved
writer.Write(0, 5); // version_number
writer.Write(1, 1); // current_next_indicator
writer.Write(0, 8); // section_number
writer.Write(0, 8); // last_section_number
writer.Write(1, 16); // program number
writer.Write(7, 3); // reserved
writer.Write(m_PMT->GetPID(), 13); // program_map_PID
writer.Write(ComputeCRC(writer.GetData()+1, 17-1-4), 32);
output.Write(writer.GetData(), 17);
output.Write(StuffingBytes, AP4_MPEG2TS_PACKET_PAYLOAD_SIZE-17);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::WritePMT
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::WritePMT(AP4_ByteStream& output)
{
// check that we have at least one media stream
if (m_Audio == NULL && m_Video == NULL) {
return AP4_ERROR_INVALID_STATE;
}
unsigned int payload_size = AP4_MPEG2TS_PACKET_PAYLOAD_SIZE;
m_PMT->WritePacketHeader(true, payload_size, false, 0, output);
AP4_BitWriter writer(1024);
unsigned int section_length = 13;
unsigned int pcr_pid = 0;
if (m_Audio) {
section_length += 5+m_Audio->m_Descriptor.GetDataSize();
pcr_pid = m_Audio->GetPID();
}
if (m_Video) {
section_length += 5+m_Video->m_Descriptor.GetDataSize();;
pcr_pid = m_Video->GetPID();
}
writer.Write(0, 8); // pointer
writer.Write(2, 8); // table_id
writer.Write(1, 1); // section_syntax_indicator
writer.Write(0, 1); // '0'
writer.Write(3, 2); // reserved
writer.Write(section_length, 12); // section_length
writer.Write(1, 16); // program_number
writer.Write(3, 2); // reserved
writer.Write(0, 5); // version_number
writer.Write(1, 1); // current_next_indicator
writer.Write(0, 8); // section_number
writer.Write(0, 8); // last_section_number
writer.Write(7, 3); // reserved
writer.Write(pcr_pid, 13); // PCD_PID
writer.Write(0xF, 4); // reserved
writer.Write(0, 12); // program_info_length
if (m_Audio) {
writer.Write(m_Audio->m_StreamType, 8); // stream_type
writer.Write(0x7, 3); // reserved
writer.Write(m_Audio->GetPID(), 13); // elementary_PID
writer.Write(0xF, 4); // reserved
writer.Write(m_Audio->m_Descriptor.GetDataSize(), 12); // ES_info_length
for (unsigned int i=0; i<m_Audio->m_Descriptor.GetDataSize(); i++) {
writer.Write(m_Audio->m_Descriptor.GetData()[i], 8);
}
}
if (m_Video) {
writer.Write(m_Video->m_StreamType, 8); // stream_type
writer.Write(0x7, 3); // reserved
writer.Write(m_Video->GetPID(), 13); // elementary_PID
writer.Write(0xF, 4); // reserved
writer.Write(m_Video->m_Descriptor.GetDataSize(), 12); // ES_info_length
for (unsigned int i=0; i<m_Video->m_Descriptor.GetDataSize(); i++) {
writer.Write(m_Video->m_Descriptor.GetData()[i], 8);
}
}
writer.Write(ComputeCRC(writer.GetData()+1, section_length-1), 32); // CRC
output.Write(writer.GetData(), section_length+4);
output.Write(StuffingBytes, AP4_MPEG2TS_PACKET_PAYLOAD_SIZE-(section_length+4));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::SetAudioStream
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::SetAudioStream(AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
SampleStream*& stream,
AP4_UI16 pid,
const AP4_UI08* descriptor,
AP4_Size descriptor_length)
{
// default
stream = NULL;
AP4_Result result = AP4_Mpeg2TsAudioSampleStream::Create(pid,
timescale,
stream_type,
stream_id,
m_Audio,
descriptor,
descriptor_length);
if (AP4_FAILED(result)) return result;
stream = m_Audio;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::SetVideoStream
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::SetVideoStream(AP4_UI32 timescale,
AP4_UI08 stream_type,
AP4_UI16 stream_id,
SampleStream*& stream,
AP4_UI16 pid,
const AP4_UI08* descriptor,
AP4_Size descriptor_length)
{
// default
stream = NULL;
AP4_Result result = AP4_Mpeg2TsVideoSampleStream::Create(pid,
timescale,
stream_type,
stream_id,
m_Video,
descriptor,
descriptor_length);
if (AP4_FAILED(result)) return result;
stream = m_Video;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_Mpeg2TsWriter::SampleStream::WriteSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_Mpeg2TsWriter::SampleStream::WriteSample(AP4_Sample& sample,
AP4_SampleDescription* sample_description,
bool with_pcr,
AP4_ByteStream& output)
{
AP4_DataBuffer sample_data;
AP4_Result result = sample.ReadData(sample_data);
if (AP4_FAILED(result)) return result;
return WriteSample(sample,
sample_data,
sample_description,
with_pcr,
output);
}
|
