winamp/Src/Plugins/Input/in_mp3/AACFrame.cpp

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2024-09-24 12:54:57 +00:00
#include "AACFrame.h"
#include "api__in_mp3.h"
#include "resource.h"
#include "in2.h"
extern In_Module mod;
void AACFrame::ReadBuffer( unsigned __int8 *buffer )
{
syncword = ( buffer[ 0 ] << 4 ) | ( buffer[ 1 ] >> 4 );
id = ( buffer[ 1 ] >> 3 ) & 1;
layer = ( buffer[ 1 ] >> 1 ) & 3;
protection = ( buffer[ 1 ] ) & 1;
profile = ( buffer[ 2 ] >> 6 ) & 3;
sampleRateIndex = ( buffer[ 2 ] >> 2 ) & 0xF;
privateBit = ( buffer[ 2 ] >> 1 ) & 1;
channelConfiguration = ( ( buffer[ 2 ] & 1 ) << 2 ) | ( ( buffer[ 3 ] >> 6 ) & 3 );
original = ( buffer[ 3 ] >> 5 ) & 1;
home = ( buffer[ 3 ] >> 4 ) & 1;
//copyright_identification_bit = (buffer[3] >> 3) & 1;
//copyright_identification_start = (buffer[3] >> 2) & 1;
frameLength = ( ( buffer[ 3 ] & 3 ) << 11 ) | ( buffer[ 4 ] << 3 ) | ( ( buffer[ 5 ] >> 5 ) & 7 );
bufferFullness = ( ( buffer[ 5 ] & 0xF8 ) << 5 ) | ( ( buffer[ 6 ] >> 2 ) & 0x3F );
numDataBlocks = buffer[ 6 ] & 3;
}
bool AACFrame::OK()
{
if (syncword == SYNC
&& layer == 0
&& sampleRateIndex < 13
//&& profile != LTP // TODO: can coding technologies decoder do LTP?
)
return true;
else
return false;
}
static const unsigned int aac_sratetab[] =
{
96000,
88200,
64000,
48000,
44100,
32000,
24000,
22050,
16000,
12000,
11025,
8000,
7350,
};
int AACFrame::GetSampleRate()
{
return aac_sratetab[sampleRateIndex];
}
static const wchar_t *aac_profiletab[] = {L"Main", L"LC", L"SSR", L"LTP"};
const wchar_t *AACFrame::GetProfileName()
{
return aac_profiletab[profile];
}
//static const char *aac_channels[] = {"Custom", "Mono", "Stereo", "3 channel", "4 channel", "surround", "5.1", "7.1"};
static wchar_t aac_channels_str[64];
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};
const wchar_t *AACFrame::GetChannelConfigurationName()
{
return WASABI_API_LNGSTRINGW_BUF(aac_channels_id[channelConfiguration],aac_channels_str,64);
}
int AACFrame::GetNumChannels()
{
switch(channelConfiguration)
{
case 7:
return 8;
default:
return channelConfiguration;
}
}
int AACFrame::GetMPEGVersion()
{
if (id == 0)
return 2;
else
return 4;
}