248 lines
8.7 KiB
C++
248 lines
8.7 KiB
C++
#include "stdafx.h"
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#include "packet_decoder_aac_common.h"
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#include "../SDK/filesystem_helper.h"
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#include "bitreader_helper.h"
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size_t packet_decoder_aac_common::skipADTSHeader( const uint8_t * data,size_t size ) {
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if ( size < 7 ) throw exception_io_data();
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PFC_ASSERT( bitreader_helper::extract_int(data, 0, 12) == 0xFFF);
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if (bitreader_helper::extract_bit(data, 12+1+2)) {
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return 7; // ABSENT flag
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}
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if (size < 9) throw exception_io_data();
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return 9;
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}
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pfc::array_t<uint8_t> packet_decoder_aac_common::parseDecoderSetup( const GUID & p_owner,t_size p_param1,const void * p_param2,t_size p_param2size) {
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if ( p_owner == owner_ADTS ) {
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pfc::array_t<uint8_t> ret;
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ret.resize( 2 );
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ret[0] = 0; ret[1] = 0;
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// ret:
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// 5 bits AOT
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// 4 bits freqindex
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// 4 bits channelconfig
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// source:
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// 12 bits 0xFFF
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// 4 bits disregard
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// 2 bits AOT-1 @ 16
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// 4 bits freqindex @ 18
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// 1 bit disregard
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// 3 bits channelconfig @ 23
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// 26 bits total, 4 bytes minimum
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if ( p_param2size < 4 ) throw exception_io_data();
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const uint8_t * source = (const uint8_t*) p_param2;
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if ( bitreader_helper::extract_int(source, 0, 12) != 0xFFF ) throw exception_io_data();
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size_t aot = bitreader_helper::extract_int(source, 16, 2) + 1;
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if ( aot >= 31 ) throw exception_io_data();
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size_t freqindex = bitreader_helper::extract_int(source, 18, 4);
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if ( freqindex > 12 ) throw exception_io_data();
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size_t channelconfig = bitreader_helper::extract_bits( source, 23, 3);
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bitreader_helper::write_int(ret.get_ptr(), 0, 5, aot);
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bitreader_helper::write_int(ret.get_ptr(), 5, 4, freqindex);
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bitreader_helper::write_int(ret.get_ptr(), 9, 4, channelconfig);
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return ret;
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} else if ( p_owner == owner_ADIF ) {
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// bah
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} else if ( p_owner == owner_MP4 )
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{
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if ( p_param1 == 0x40 || p_param1 == 0x66 || p_param1 == 0x67 || p_param1 == 0x68 ) {
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pfc::array_t<uint8_t> ret;
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ret.set_data_fromptr( (const uint8_t*) p_param2, p_param2size);
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return ret;
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}
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}
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else if ( p_owner == owner_matroska )
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{
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const matroska_setup * setup = ( const matroska_setup * ) p_param2;
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if ( p_param2size == sizeof(*setup) )
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{
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if ( !strcmp(setup->codec_id, "A_AAC") || !strncmp(setup->codec_id, "A_AAC/", 6) ) {
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pfc::array_t<uint8_t> ret;
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ret.set_data_fromptr( (const uint8_t*) setup->codec_private, setup->codec_private_size );
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return ret;
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}
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}
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}
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throw exception_io_data();
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}
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#if 0
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bool packet_decoder_aac_common::parseDecoderSetup(const GUID &p_owner, t_size p_param1, const void *p_param2, t_size p_param2size, const void *&outCodecPrivate, size_t &outCodecPrivateSize) {
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outCodecPrivate = NULL;
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outCodecPrivateSize = 0;
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if ( p_owner == owner_ADTS ) { return true; }
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else if ( p_owner == owner_ADIF ) { return true; }
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else if ( p_owner == owner_MP4 )
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{
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if ( p_param1 == 0x40 || p_param1 == 0x66 || p_param1 == 0x67 || p_param1 == 0x68 ) {
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outCodecPrivate = p_param2; outCodecPrivateSize = p_param2size;
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return true;
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}
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}
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else if ( p_owner == owner_matroska )
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{
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const matroska_setup * setup = ( const matroska_setup * ) p_param2;
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if ( p_param2size == sizeof(*setup) )
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{
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if ( !strcmp(setup->codec_id, "A_AAC") || !strncmp(setup->codec_id, "A_AAC/", 6) ) {
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outCodecPrivate = (const uint8_t *) setup->codec_private;
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outCodecPrivateSize = setup->codec_private_size;
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return true;
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}
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}
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}
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return false;
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}
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#endif
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bool packet_decoder_aac_common::testDecoderSetup( const GUID & p_owner, t_size p_param1, const void * p_param2, t_size p_param2size ) {
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if ( p_owner == owner_ADTS ) { return true; }
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else if ( p_owner == owner_ADIF ) { return true; }
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else if ( p_owner == owner_MP4 )
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{
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if ( p_param1 == 0x40 || p_param1 == 0x66 || p_param1 == 0x67 || p_param1 == 0x68 ) {
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return true;
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}
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}
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else if ( p_owner == owner_matroska )
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{
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const matroska_setup * setup = ( const matroska_setup * ) p_param2;
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if ( p_param2size == sizeof(*setup) )
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{
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if ( !strcmp(setup->codec_id, "A_AAC") || !strncmp(setup->codec_id, "A_AAC/", 6) ) {
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return true;
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}
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}
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}
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return false;
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}
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namespace {
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class esds_maker : public stream_writer_buffer_simple {
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public:
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void write_esds_obj( uint8_t code, const void * data, size_t size, abort_callback & aborter ) {
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if ( size >= ( 1 << 28 ) ) throw pfc::exception_overflow();
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write_byte(code, aborter);
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for ( int i = 3; i >= 0; -- i ) {
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uint8_t c = (uint8_t)( 0x7F & ( size >> 7 * i ) );
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if ( i > 0 ) c |= 0x80;
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write_byte(c, aborter);
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}
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write( data, size, aborter );
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}
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void write_esds_obj( uint8_t code, esds_maker const & other, abort_callback & aborter ) {
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write_esds_obj( code, other.m_buffer.get_ptr(), other.m_buffer.get_size(), aborter );
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}
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void write_byte( uint8_t byte , abort_callback & aborter ) {
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write( &byte, 1, aborter );
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}
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};
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}
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void packet_decoder_aac_common::make_ESDS( pfc::array_t<uint8_t> & outESDS, const void * inCodecPrivate, size_t inCodecPrivateSize ) {
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if (inCodecPrivateSize > 1024*1024) throw exception_io_data(); // sanity
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auto & p_abort = fb2k::noAbort;
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esds_maker esds4;
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const uint8_t crap[] = {0x40, 0x15, 0x00, 0x00, 0x00, 0x00, 0x05, 0x34, 0x08, 0x00, 0x02, 0x3D, 0x55};
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esds4.write( crap, sizeof(crap), p_abort );
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{
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esds_maker esds5;
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esds5.write( inCodecPrivate, inCodecPrivateSize, p_abort );
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esds4.write_esds_obj(5, esds5, p_abort);
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}
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esds_maker esds3;
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esds3.write_byte( 0, p_abort );
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esds3.write_byte( 1, p_abort );
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esds3.write_byte( 0, p_abort );
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esds3.write_esds_obj(4, esds4, p_abort);
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// esds6 after esds4, but doesn't seem that important
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esds_maker final;
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final.write_esds_obj(3, esds3, p_abort);
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outESDS.set_data_fromptr( final.m_buffer.get_ptr(), final.m_buffer.get_size() );
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/*
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static const uint8_t esdsTemplate[] = {
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0x03, 0x80, 0x80, 0x80, 0x25, 0x00, 0x01, 0x00, 0x04, 0x80, 0x80, 0x80, 0x17, 0x40, 0x15, 0x00,
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0x00, 0x00, 0x00, 0x05, 0x34, 0x08, 0x00, 0x02, 0x3D, 0x55, 0x05, 0x80, 0x80, 0x80, 0x05, 0x12,
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0x30, 0x56, 0xE5, 0x00, 0x06, 0x80, 0x80, 0x80, 0x01, 0x02
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};
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*/
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// ESDS: 03 80 80 80 25 00 01 00 04 80 80 80 17 40 15 00 00 00 00 05 34 08 00 02 3D 55 05 80 80 80 05 12 30 56 E5 00 06 80 80 80 01 02
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// For: 12 30 56 E5 00
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}
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const uint32_t aac_sample_rates[] = {
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96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350
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};
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static unsigned readSamplingFreq(bitreader_helper::bitreader_limited& r) {
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unsigned samplingRateIndex = (unsigned)r.read(4);
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if (samplingRateIndex == 15) {
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return (unsigned)r.read(24);
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} else {
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if (samplingRateIndex >= PFC_TABSIZE(aac_sample_rates)) throw exception_io_data();
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return aac_sample_rates[samplingRateIndex];
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}
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}
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packet_decoder_aac_common::audioSpecificConfig_t packet_decoder_aac_common::parseASC(const void * p_, size_t s) {
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// Source: https://wiki.multimedia.cx/index.php?title=MPEG-4_Audio
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bitreader_helper::bitreader_limited r((const uint8_t*)p_, 0, s * 8);
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audioSpecificConfig_t cfg = {};
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cfg.m_objectType = (unsigned) r.read(5);
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if (cfg.m_objectType == 31) {
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cfg.m_objectType = 32 + (unsigned) r.read(6);
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}
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cfg.m_sampleRate = readSamplingFreq(r);
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cfg.m_channels = (unsigned) r.read( 4 );
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if (cfg.m_objectType == 5 || cfg.m_objectType == 29) {
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cfg.m_explicitSBR = true;
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cfg.m_explicitPS = (cfg.m_objectType == 29);
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cfg.m_sbrRate = readSamplingFreq(r);
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cfg.m_objectType = (unsigned)r.read(5);
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}
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switch (cfg.m_objectType) {
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case 1: case 2: case 3: case 4: case 17: case 23:
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cfg.m_shortWindow = (r.read(1) != 0);
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break;
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}
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return cfg;
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}
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unsigned packet_decoder_aac_common::get_ASC_object_type(const void * p_, size_t s) {
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// Source: https://wiki.multimedia.cx/index.php?title=MPEG-4_Audio
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bitreader_helper::bitreader_limited r((const uint8_t*)p_, 0, s * 8);
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unsigned objectType = (unsigned) r.read(5);
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if (objectType == 31) {
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objectType = 32 + (unsigned) r.read(6);
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}
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return objectType;
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}
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