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srs/trunk/src/srt/ts_demux.cpp

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#include "ts_demux.hpp"
#include <assert.h>
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#include <string.h>
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ts_demux::ts_demux():_data_total(0)
,_last_pid(0)
,_last_dts(0)
,_last_pts(0)
{
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}
ts_demux::~ts_demux() {
}
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int ts_demux::decode_unit(unsigned char* data_p, std::string key_path, TS_DATA_CALLBACK_PTR callback)
{
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int pos = 0;
int npos = 0;
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ts_header ts_header_info;
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ts_header_info._sync_byte = data_p[pos];
pos++;
ts_header_info._transport_error_indicator = (data_p[pos]&0x80)>>7;
ts_header_info._payload_unit_start_indicator = (data_p[pos]&0x40)>>6;
ts_header_info._transport_priority = (data_p[pos]&0x20)>>5;
ts_header_info._PID = ((data_p[pos]<<8)|data_p[pos+1])&0x1FFF;
pos += 2;
ts_header_info._transport_scrambling_control = (data_p[pos]&0xC0)>>6;
ts_header_info._adaptation_field_control = (data_p[pos]&0x30)>>4;
ts_header_info._continuity_counter = (data_p[pos]&0x0F);
pos++;
npos = pos;
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//printf("ts header(0x%02x) payload_unit_start_indicator:%d, pid:%d, adaptation_field_control:%d, pos:%d\r\n",
// ts_header_info._sync_byte,
// ts_header_info._payload_unit_start_indicator, ts_header_info._PID,
// ts_header_info._adaptation_field_control, pos);
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adaptation_field* field_p = &(ts_header_info._adaptation_field_info);
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// adaptation field
// 0x01 No adaptation_field, payload only
// 0x02 Adaptation_field only, no payload
// 0x03 Adaptation_field followed by payload
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if( ts_header_info._adaptation_field_control == 2
|| ts_header_info._adaptation_field_control == 3 ){
// adaptation_field()
field_p->_adaptation_field_length = data_p[pos];
pos++;
if( field_p->_adaptation_field_length > 0 ){
field_p->_discontinuity_indicator = (data_p[pos]&0x80)>>7;
field_p->_random_access_indicator = (data_p[pos]&0x40)>>6;
field_p->_elementary_stream_priority_indicator = (data_p[pos]&0x20)>>5;
field_p->_PCR_flag = (data_p[pos]&0x10)>>4;
field_p->_OPCR_flag = (data_p[pos]&0x08)>>3;
field_p->_splicing_point_flag = (data_p[pos]&0x04)>>2;
field_p->_transport_private_data_flag = (data_p[pos]&0x02)>>1;
field_p->_adaptation_field_extension_flag = (data_p[pos]&0x01);
pos++;
if( field_p->_PCR_flag == 1 ) { // PCR info
//program_clock_reference_base 33 uimsbf
//reserved 6 bslbf
//program_clock_reference_extension 9 uimsbf
pos += 6;
}
if( field_p->_OPCR_flag == 1 ) {
//original_program_clock_reference_base 33 uimsbf
//reserved 6 bslbf
//original_program_clock_reference_extension 9 uimsbf
pos += 6;
}
if( field_p->_splicing_point_flag == 1 ) {
//splice_countdown 8 tcimsbf
pos++;
}
if( field_p->_transport_private_data_flag == 1 ) {
//transport_private_data_length 8 uimsbf
field_p->_transport_private_data_length = data_p[pos];
pos++;
memcpy(field_p->_private_data_byte, data_p + pos, field_p->_transport_private_data_length);
}
if( field_p->_adaptation_field_extension_flag == 1 ) {
//adaptation_field_extension_length 8 uimsbf
field_p->_adaptation_field_extension_length = data_p[pos];
pos++;
//ltw_flag 1 bslbf
field_p->_ltw_flag = (data_p[pos]&0x80)>>7;
//piecewise_rate_flag 1 bslbf
field_p->_piecewise_rate_flag = (data_p[pos]&0x40)>>6;
//seamless_splice_flag 1 bslbf
field_p->_seamless_splice_flag = (data_p[pos]&0x20)>>5;
//reserved 5 bslbf
pos++;
if (field_p->_ltw_flag == 1) {
//ltw_valid_flag 1 bslbf
//ltw_offset 15 uimsbf
pos += 2;
}
if (field_p->_piecewise_rate_flag == 1) {
//reserved 2 bslbf
//piecewise_rate 22 uimsbf
pos += 3;
}
if (field_p->_seamless_splice_flag == 1) {
//splice_type 4 bslbf
//DTS_next_AU[32..30] 3 bslbf
//marker_bit 1 bslbf
//DTS_next_AU[29..15] 15 bslbf
//marker_bit 1 bslbf
//DTS_next_AU[14..0] 15 bslbf
//marker_bit 1 bslbf
pos += 5;
}
}
}
npos += sizeof(field_p->_adaptation_field_length) + field_p->_adaptation_field_length;
}
if(ts_header_info._adaptation_field_control == 1
|| ts_header_info._adaptation_field_control == 3 ) {
// data_byte with placeholder
// payload parser
if(ts_header_info._PID == 0x00){
// PAT // program association table
if(ts_header_info._payload_unit_start_indicator) {
pos++;
}
_pat._table_id = data_p[pos];
pos++;
_pat._section_syntax_indicator = (data_p[pos]>>7)&0x01;
// skip 3 bits of 1 zero and 2 reserved
_pat._section_length = ((data_p[pos]<<8)|data_p[pos+1])&0x0FFF;
pos += 2;
_pat._transport_stream_id = (data_p[pos]<<8)|data_p[pos+1];
pos += 2;
// reserved 2 bits
_pat._version_number = (data_p[pos]&0x3E)>>1;
_pat._current_next_indicator = data_p[pos]&0x01;
pos++;
_pat._section_number = data_p[pos];
pos++;
_pat._last_section_number = data_p[pos];
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assert(_pat._table_id == 0x00);
assert((188 - npos) > (_pat._section_length+3)); // PAT = section_length + 3
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pos++;
_pat._pid_vec.clear();
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for (;pos+4 <= _pat._section_length-5-4+9 + npos;) { // 4:CRC, 5:follow section_length item rpos + 4(following unit length) section_length + 9(above field and unit_start_first_byte )
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PID_INFO pid_info;
//program_number 16 uimsbf
pid_info._program_number = data_p[pos]<<8|data_p[pos+1];
pos += 2;
// reserved 3 bslbf
if (pid_info._program_number == 0) {
// // network_PID 13 uimsbf
pid_info._network_id = (data_p[pos]<<8|data_p[pos+1])&0x1FFF;
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//printf("#### network id:%d.\r\n", pid_info._network_id);
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pos += 2;
}
else {
// // program_map_PID 13 uimsbf
pid_info._pid = (data_p[pos]<<8|data_p[pos+1])&0x1FFF;
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//printf("#### pmt id:%d.\r\n", pid_info._pid);
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pos += 2;
}
_pat._pid_vec.push_back(pid_info);
// network_PID and program_map_PID save to list
}
// CRC_32 use pat to calc crc32, eq
pos += 4;
}else if(ts_header_info._PID == 0x01){
// CAT // conditional access table
}else if(ts_header_info._PID == 0x02){
//TSDT // transport stream description table
}else if(ts_header_info._PID == 0x03){
//IPMP // IPMP control information table
// 0x0004-0x000F Reserved
// 0x0010-0x1FFE May be assigned as network_PID, Program_map_PID, elementary_PID, or for other purposes
}else if(ts_header_info._PID == 0x11){
// SDT // https://en.wikipedia.org/wiki/Service_Description_Table / https://en.wikipedia.org/wiki/MPEG_transport_stream
}else if(is_pmt(ts_header_info._PID)) {
if(ts_header_info._payload_unit_start_indicator)
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pos++;
_pmt._table_id = data_p[pos];
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pos++;
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_pmt._section_syntax_indicator = (data_p[pos]>>7)&0x01;
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// skip 3 bits of 1 zero and 2 reserved
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_pmt._section_length = ((data_p[pos]<<8)|data_p[pos+1])&0x0FFF;
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pos += 2;
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_pmt._program_number = (data_p[pos]<<8)|data_p[pos+1];
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pos += 2;
// reserved 2 bits
_pmt._version_number = (data_p[pos]&0x3E)>>1;
_pmt._current_next_indicator = data_p[pos]&0x01;
pos++;
_pmt._section_number = data_p[pos];
pos++;
_pmt._last_section_number = data_p[pos];
pos++;
// skip 3 bits for reserved 3 bslbf
_pmt._PCR_PID = ((data_p[pos]<<8)|data_p[pos+1])&0x1FFF; //PCR_PID 13 uimsbf
pos += 2;
//reserved 4 bslbf
_pmt._program_info_length = ((data_p[pos]<<8)|data_p[pos+1])&0x0FFF;//program_info_length 12 uimsbf
pos += 2;
assert(_pmt._table_id==0x02); // 0x02, // TS_program_map_section
memcpy(_pmt._dscr, data_p+pos, _pmt._program_info_length);
// for (i = 0; i < N; i++) {
// descriptor()
// }
pos += _pmt._program_info_length;
_pmt._stream_pid_vec.clear();
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_pmt._pid2steamtype.clear();
for (; pos + 5 <= _pmt._section_length + 4 - 4 + npos; ) { // pos(above field length) i+5(following unit length) section_length +3(PMT begin three bytes)+1(payload_unit_start_indicator) -4(crc32)
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STREAM_PID_INFO pid_info;
pid_info._stream_type = data_p[pos];//stream_type 8 uimsbf 0x1B AVC video stream as defined in ITU-T Rec. H.264 | ISO/IEC 14496-10 Video
pos++;
//reserved 3 bslbf
pid_info._elementary_PID = ((data_p[pos]<<8)|data_p[pos+1])&0x1FFF; //elementary_PID 13 uimsbf
pos += 2;
//reserved 4 bslbf
pid_info._ES_info_length = ((data_p[pos]<<8)|data_p[pos+1])&0x0FFF; //ES_info_length 12 uimsbf
pos += 2;
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if( pos + pid_info._ES_info_length > _pmt._section_length + 4 - 4 + npos )
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break;
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int absES_info_length = pos + pid_info._ES_info_length;
for (; pos< absES_info_length; ) {
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//descriptor()
int descriptor_tag = data_p[pos];
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(void)descriptor_tag;
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pos++;
int descriptor_length = data_p[pos];
pos++;
memcpy(pid_info._dscr, data_p + pos, descriptor_length);
pos += descriptor_length;
}
// save program_number(stream num) elementary_PID(PES PID) stream_type(stream codec)
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//printf("pmt pid:%d, streamtype:%d, pos:%d\r\n", pid_info._elementary_PID, pid_info._stream_type, pos);
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_pmt._stream_pid_vec.push_back(pid_info);
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_pmt._pid2steamtype.insert(std::make_pair((unsigned short)pid_info._elementary_PID, pid_info._stream_type));
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}
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pos += 4;//CRC_32
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}else if(ts_header_info._PID == 0x0042){
// USER
}else if(ts_header_info._PID == 0x1FFF){
// Null packet
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}else{//pes packet or pure data packet
//bool isFound = false;
for (size_t i = 0; i < _pmt._stream_pid_vec.size(); i++) {
if(ts_header_info._PID == _pmt._stream_pid_vec[i]._elementary_PID){
//isFound = true;
if(ts_header_info._payload_unit_start_indicator){
unsigned char* ret_data_p = nullptr;
size_t ret_size = 0;
//callback last media data in data buffer
on_callback(callback, _last_pid, key_path, _last_dts, _last_pts);
pes_parse(data_p+npos, npos, &ret_data_p, ret_size, _last_dts, _last_pts);
if ((ret_data_p != nullptr) && (ret_size > 0)) {
insert_into_databuf(ret_data_p, ret_size, key_path, ts_header_info._PID);
}
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}else{
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//fwrite(p, 1, 188-(npos+pos), pes_info[i].fd);
insert_into_databuf(data_p + npos, 188-npos, key_path, ts_header_info._PID);
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}
}
}
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//if(!isFound){
// printf("unknown PID = %X \n", ts_header_info._PID);
//}
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}
}
return 0;
}
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int ts_demux::decode(SRT_DATA_MSG_PTR data_ptr, TS_DATA_CALLBACK_PTR callback)
{
int ret = -1;
std::string path;
if (!data_ptr || (data_ptr->data_len() < 188) || (data_ptr->data_len()%188 != 0))
{
return -1;
}
unsigned int count = data_ptr->data_len()/188;
path = data_ptr->get_path();
for (unsigned int index = 0; index < count; index++)
{
ret = decode_unit(data_ptr->get_data() + 188*index, path, callback);
if (ret < 0)
{
break;
}
}
return ret;
}
void ts_demux::insert_into_databuf(unsigned char* data_p, size_t data_size, std::string key_path, unsigned short pid) {
_last_pid = pid;
_data_total += data_size;
_data_buffer_vec.push_back(std::make_shared<SRT_DATA_MSG>(data_p, data_size, key_path));
return;
}
void ts_demux::on_callback(TS_DATA_CALLBACK_PTR callback, unsigned short pid, std::string key_path,
uint64_t dts, uint64_t pts) {
if ((_data_total <=0 ) || (_data_buffer_vec.empty())) {
return;
}
auto iter = _pmt._pid2steamtype.find(pid);
if (iter == _pmt._pid2steamtype.end()) {
return;
}
unsigned char stream_type = iter->second;
auto total_data_ptr = std::make_shared<SRT_DATA_MSG>(_data_total, key_path);
size_t pos = 0;
for (size_t index = 0; index < _data_buffer_vec.size(); index++) {
memcpy(total_data_ptr->get_data() + pos,
_data_buffer_vec[index]->get_data(),
_data_buffer_vec[index]->data_len());
pos += _data_buffer_vec[index]->data_len();
}
_data_buffer_vec.clear();
_data_total = 0;
callback->on_data_callback(total_data_ptr, stream_type, dts, pts);
return;
}
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bool ts_demux::is_pmt(unsigned short pid) {
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for (size_t index = 0; index < _pat._pid_vec.size(); index++) {
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if (_pat._pid_vec[index]._program_number != 0) {
if (_pat._pid_vec[index]._pid == pid) {
return true;
}
}
}
return false;
}
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int ts_demux::pes_parse(unsigned char* p, size_t npos,
unsigned char** ret_pp, size_t& ret_size,
uint64_t& dts, uint64_t& pts) {
int pos = 0;
int packet_start_code_prefix = (p[pos]<<16)|(p[pos+1]<<8)|p[pos+2]; //packet_start_code_prefix 24 bslbf
pos += 3;
int stream_id = p[pos]; //stream_id 8 uimsbf
pos++;
//printf("pes parse %02x %02x.\r\n", p[pos], p[pos+1]);
int PES_packet_length = ((unsigned int)p[pos]<<8)|p[pos+1]; //PES_packet_length 16 uimsbf
(void)PES_packet_length;
pos += 2;
//printf("pes parse packet_start_code_prefix:%d, npos:%lu, PES_packet_length:%d, stream_id:%d.\r\n",
// packet_start_code_prefix, npos, PES_packet_length, stream_id);
assert(0x00000001 == packet_start_code_prefix);
if (stream_id != 188//program_stream_map 1011 1100
&& stream_id != 190//padding_stream 1011 1110
&& stream_id != 191//private_stream_2 1011 1111
&& stream_id != 240//ECM 1111 0000
&& stream_id != 241//EMM 1111 0001
&& stream_id != 255//program_stream_directory 1111 1111
&& stream_id != 242//DSMCC_stream 1111 0010
&& stream_id != 248//ITU-T Rec. H.222.1 type E stream 1111 1000
)
{
assert(0x80 == p[pos]);
//skip 2bits//'10' 2 bslbf
int PES_scrambling_control = (p[pos]&30)>>4; //PES_scrambling_control 2 bslbf
(void)PES_scrambling_control;
int PES_priority = (p[pos]&0x08)>>3; //PES_priority 1 bslbf
(void)PES_priority;
int data_alignment_indicator = (p[pos]&0x04)>>2;//data_alignment_indicator 1 bslbf
(void)data_alignment_indicator;
int copyright = (p[pos]&0x02)>>1; //copyright 1 bslbf
(void)copyright;
int original_or_copy = (p[pos]&0x01);//original_or_copy 1 bslbf
(void)original_or_copy;
pos++;
int PTS_DTS_flags = (p[pos]&0xC0)>>6; //PTS_DTS_flags 2 bslbf
int ESCR_flag = (p[pos]&0x20)>>5; // ESCR_flag 1 bslbf
int ES_rate_flag = (p[pos]&0x10)>>4;//ES_rate_flag 1 bslbf
int DSM_trick_mode_flag = (p[pos]&0x08)>>3;//DSM_trick_mode_flag 1 bslbf
int additional_copy_info_flag = (p[pos]&0x04)>>2; //additional_copy_info_flag 1 bslbf
int PES_CRC_flag = (p[pos]&0x02)>>1; //PES_CRC_flag 1 bslbf
int PES_extension_flag = (p[pos]&0x01);//PES_extension_flag 1 bslbf
pos++;
int PES_header_data_length = p[pos]; //PES_header_data_length 8 uimsbf
(void)PES_header_data_length;
pos++;
if (PTS_DTS_flags == 2) {
// skip 4 bits '0010' 4 bslbf
// PTS [32..30] 3 bslbf
// marker_bit 1 bslbf
// PTS [29..15] 15 bslbf
// marker_bit 1 bslbf
// PTS [14..0] 15 bslbf
// marker_bit 1 bslbf
pts = (((p[pos]>>1)&0x07) << 30) | (p[pos+1]<<22) | (((p[pos+2]>>1)&0x7F)<<15) | (p[pos+3]<<7) | ((p[pos+4]>>1)&0x7F);
pos += 5;
}
if (PTS_DTS_flags == 3) {
// '0011' 4 bslbf
// PTS [32..30] 3 bslbf
// marker_bit 1 bslbf
//PTS [29..15] 15 bslbf
//marker_bit 1 bslbf
// PTS [14..0] 15 bslbf
// marker_bit 1 bslbf
pts = (((p[pos]>>1)&0x07) << 30) | (p[pos+1]<<22) | (((p[pos+2]>>1)&0x7F)<<15) | (p[pos+3]<<7) | ((p[pos+4]>>1)&0x7F);
pos += 5;
// '0001' 4 bslbf
// DTS [32..30] 3 bslbf
// marker_bit 1 bslbf
// DTS [29..15] 15 bslbf
// marker_bit 1 bslbf
// DTS [14..0] 15 bslbf
// marker_bit 1 bslbf
dts = (((p[pos]>>1)&0x07) << 30) | (p[pos+1]<<22) | (((p[pos+2]>>1)&0x7F)<<15) | (p[pos+3]<<7) | ((p[pos+4]>>1)&0x7F);
pos += 5;
}
if (ESCR_flag == 1) {
// reserved 2 bslbf
// ESCR_base[32..30] 3 bslbf
// marker_bit 1 bslbf
// ESCR_base[29..15] 15 bslbf
// marker_bit 1 bslbf
// ESCR_base[14..0] 15 bslbf
// marker_bit 1 bslbf
// ESCR_extension 9 uimsbf
// marker_bit 1 bslbf
uint64_t ESCR_base = ((((uint64_t)p[pos] >> 3) & 0x07) << 30) | (((uint64_t)p[pos] & 0x03) << 28) | ((uint64_t)p[pos + 1] << 20) | ((((uint64_t)p[pos + 2] >> 3) & 0x1F) << 15) | (((uint64_t)p[pos + 2] & 0x3) << 13) | ((uint64_t)p[pos + 3] << 5) | ((p[pos + 4] >> 3) & 0x1F);
int ESCR_extension = ((p[pos + 4] & 0x03) << 7) | ((p[pos + 5] >> 1) & 0x7F);
(void)ESCR_base;
(void)ESCR_extension;
pos += 6;
}
if (ES_rate_flag == 1) {
// marker_bit 1 bslbf
// ES_rate 22 uimsbf
// marker_bit 1 bslbf
int ES_rate = (p[pos]&0x7F)<<15 | (p[pos+1])<<7 | (p[pos+2]&0x7F)>>1;
(void)ES_rate;
pos += 3;
}
if (DSM_trick_mode_flag == 1) { // ignore
int trick_mode_control = (p[pos]&0xE0)>>5;//trick_mode_control 3 uimsbf
if ( trick_mode_control == 0/*fast_forward*/ ) {
// field_id 2 bslbf
// intra_slice_refresh 1 bslbf
// frequency_truncation 2 bslbf
}
else if ( trick_mode_control == 1/*slow_motion*/ ) {
//rep_cntrl 5 uimsbf
}
else if ( trick_mode_control == 2/*freeze_frame*/ ) {
// field_id 2 uimsbf
// reserved 3 bslbf
}
else if ( trick_mode_control == 3/*fast_reverse*/ ) {
// field_id 2 bslbf
// intra_slice_refresh 1 bslbf
// frequency_truncation 2 bslbf
}else if ( trick_mode_control == 4/*slow_reverse*/ ) {
// rep_cntrl 5 uimsbf
}
else{
//reserved 5 bslbf
}
pos++;
}
if ( additional_copy_info_flag == 1) { // ignore
// marker_bit 1 bslbf
// additional_copy_info 7 bslbf
pos++;
}
if ( PES_CRC_flag == 1) { // ignore
// previous_PES_packet_CRC 16 bslbf
pos += 2;
}
if ( PES_extension_flag == 1) { // ignore
int PES_private_data_flag = (p[pos]&0x80)>>7;// PES_private_data_flag 1 bslbf
int pack_header_field_flag = (p[pos]&0x40)>>6;// pack_header_field_flag 1 bslbf
int program_packet_sequence_counter_flag = (p[pos]&0x20)>>5;// program_packet_sequence_counter_flag 1 bslbf
int P_STD_buffer_flag = (p[pos]&0x10)>>4; // P-STD_buffer_flag 1 bslbf
// reserved 3 bslbf
int PES_extension_flag_2 = (p[pos]&0x01);// PES_extension_flag_2 1 bslbf
pos++;
if ( PES_private_data_flag == 1) {
// PES_private_data 128 bslbf
pos += 16;
}
if (pack_header_field_flag == 1) {
// pack_field_length 8 uimsbf
// pack_header()
}
if (program_packet_sequence_counter_flag == 1) {
// marker_bit 1 bslbf
// program_packet_sequence_counter 7 uimsbf
// marker_bit 1 bslbf
// MPEG1_MPEG2_identifier 1 bslbf
// original_stuff_length 6 uimsbf
pos += 2;
}
if ( P_STD_buffer_flag == 1) {
// '01' 2 bslbf
// P-STD_buffer_scale 1 bslbf
// P-STD_buffer_size 13 uimsbf
pos += 2;
}
if ( PES_extension_flag_2 == 1) {
// marker_bit 1 bslbf
int PES_extension_field_length = (p[pos]&0x7F);// PES_extension_field_length 7 uimsbf
pos++;
for (int i = 0; i < PES_extension_field_length; i++) {
// reserved 8 bslbf
pos++;
}
}
}
// for (int i = 0; i < N1; i++) {
//stuffing_byte 8 bslbf
// rpos++;
// }
// for (int i = 0; i < N2; i++) {
//PES_packet_data_byte 8 bslbf
// rpos++;
// }
*ret_pp = p+pos;
ret_size = 188-(npos+pos);
//printf("pes parse body size:%lu, data:0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x, dts:%lu(%lu), pts:%lu(%lu)\r\n",
// ret_size, p[pos], p[pos+1], p[pos+2], p[pos+3], p[pos+4], p[pos+5],
// dts, dts/90, pts, pts/90);
}
else if ( stream_id == 188//program_stream_map 1011 1100 BC
|| stream_id == 191//private_stream_2 1011 1111 BF
|| stream_id == 240//ECM 1111 0000 F0
|| stream_id == 241//EMM 1111 0001 F1
|| stream_id == 255//program_stream_directory 1111 1111 FF
|| stream_id == 242//DSMCC_stream 1111 0010 F2
|| stream_id == 248//ITU-T Rec. H.222.1 type E stream 1111 1000 F8
) {
// for (i = 0; i < PES_packet_length; i++) {
//PES_packet_data_byte 8 bslbf
// rpos++;
// }
*ret_pp = p+pos;
ret_size = 188-(npos+pos);
//fwrite(p, 1, 188-(npos+rpos), fd);
}
else if ( stream_id == 190//padding_stream 1011 1110
) {
// for (i = 0; i < PES_packet_length; i++) {
// padding_byte 8 bslbf
// rpos++;
*ret_pp = p+pos;
ret_size = 188-(npos+pos);
// }
}
return pos;
}
Reference in a new issue Copy permalink