94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
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#include "AACFrame.h"
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#include "api__in_mp3.h"
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#include "resource.h"
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#include "in2.h"
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extern In_Module mod;
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void AACFrame::ReadBuffer( unsigned __int8 *buffer )
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{
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syncword = ( buffer[ 0 ] << 4 ) | ( buffer[ 1 ] >> 4 );
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id = ( buffer[ 1 ] >> 3 ) & 1;
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layer = ( buffer[ 1 ] >> 1 ) & 3;
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protection = ( buffer[ 1 ] ) & 1;
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profile = ( buffer[ 2 ] >> 6 ) & 3;
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sampleRateIndex = ( buffer[ 2 ] >> 2 ) & 0xF;
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privateBit = ( buffer[ 2 ] >> 1 ) & 1;
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channelConfiguration = ( ( buffer[ 2 ] & 1 ) << 2 ) | ( ( buffer[ 3 ] >> 6 ) & 3 );
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original = ( buffer[ 3 ] >> 5 ) & 1;
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home = ( buffer[ 3 ] >> 4 ) & 1;
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//copyright_identification_bit = (buffer[3] >> 3) & 1;
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//copyright_identification_start = (buffer[3] >> 2) & 1;
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frameLength = ( ( buffer[ 3 ] & 3 ) << 11 ) | ( buffer[ 4 ] << 3 ) | ( ( buffer[ 5 ] >> 5 ) & 7 );
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bufferFullness = ( ( buffer[ 5 ] & 0xF8 ) << 5 ) | ( ( buffer[ 6 ] >> 2 ) & 0x3F );
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numDataBlocks = buffer[ 6 ] & 3;
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}
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bool AACFrame::OK()
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{
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if (syncword == SYNC
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&& layer == 0
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&& sampleRateIndex < 13
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//&& profile != LTP // TODO: can coding technologies decoder do LTP?
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)
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return true;
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else
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return false;
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}
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static const unsigned int aac_sratetab[] =
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{
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96000,
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88200,
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64000,
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48000,
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44100,
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32000,
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24000,
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22050,
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16000,
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12000,
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11025,
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8000,
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7350,
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};
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int AACFrame::GetSampleRate()
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{
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return aac_sratetab[sampleRateIndex];
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}
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static const wchar_t *aac_profiletab[] = {L"Main", L"LC", L"SSR", L"LTP"};
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const wchar_t *AACFrame::GetProfileName()
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{
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return aac_profiletab[profile];
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}
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//static const char *aac_channels[] = {"Custom", "Mono", "Stereo", "3 channel", "4 channel", "surround", "5.1", "7.1"};
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static wchar_t aac_channels_str[64];
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static int aac_channels_id[] = {IDS_CUSTOM, IDS_MONO, IDS_STEREO, IDS_3_CHANNEL, IDS_4_CHANNEL, IDS_SURROUND, IDS_5_1, IDS_7_1};
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const wchar_t *AACFrame::GetChannelConfigurationName()
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{
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return WASABI_API_LNGSTRINGW_BUF(aac_channels_id[channelConfiguration],aac_channels_str,64);
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}
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int AACFrame::GetNumChannels()
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{
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switch(channelConfiguration)
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{
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case 7:
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return 8;
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default:
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return channelConfiguration;
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}
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}
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int AACFrame::GetMPEGVersion()
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{
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if (id == 0)
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return 2;
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else
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return 4;
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}
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