bool nuiAiffReader::ReadInfo()
{
ScanAllChunks();
//there are 8 unused bytes at the beginning of the "SSND" chunk in an AIFF file
Chunk* pSSNDChunk = GetChunk("SSND");
if (!pSSNDChunk)
return false;
pSSNDChunk->mDataPosition += 8;
bool res = false;
res = GoToChunk("FORM");
if (!res)
return false;
std::vector<char> fileFormat(4);
char* waveFormat = "AIFF";
for(uint32 i = 0; i < 4; i++)
{
if( 1 != mrStream.ReadUInt8((uint8*)&(fileFormat[i]), 1))
return false;
if (fileFormat[i] != waveFormat[i])
return false; // this stream is not a wave stream
}
mInfo.SetFileFormat(eAudioWave);
res = GoToChunk("COMM");
if (!res)
return false;
int16 Channels = 0;
uint32 SampleFrames = 0;
int16 SampleSize = 0;
extended SampleRate;
//Read all parameters given in "COMM" chunk
if( 1 != mrStream.ReadInt16(&Channels,1))
return false;
if( 1 != mrStream.ReadUInt32(&SampleFrames,1))
return false;
if( 1 != mrStream.ReadInt16(&SampleSize,1))
return false;
//read SampleRate exponent
if( 1 != mrStream.ReadInt16(SampleRate.exp,1))
return false;
//read Samplerate Mantisse
if( 4 != mrStream.ReadInt16(SampleRate.man,4))
return false;
mInfo.SetFormatTag(AIFF_FORMAT_TAG);
mInfo.SetSampleRate(ExtendedToDouble(SampleRate));
mInfo.SetChannels(Channels);
mInfo.SetBitsPerSample(SampleSize);
mInfo.SetSampleFrames(SampleFrames);
mInfo.SetStartFrame(0);
mInfo.SetStopFrame(mInfo.GetSampleFrames());
return true;
}
bool nuiWaveReader::ReadInfo()
{
ScanAllChunks();
uint16 Format = eWaveFormatUnknown;
uint16 NbChannels = 0;
uint32 SamplesPerSec = 0;
uint32 AvgBytesPerSec = 0;
uint16 BlockAlign = 0;
uint16 BitsPerSample = 0;
uint32 NbSamples = 0;
bool res = false;
res = GoToChunk("RIFF");
if (!res)
return false;
std::vector<char> fileFormat(4);
char* waveFormat = "WAVE";
for (int32 i = 0; i < 4; i++)
{
if( 1 != mrStream.ReadUInt8((uint8*)&(fileFormat[i]), 1))
return false;
if (fileFormat[i] != waveFormat[i])
return false; // this stream is not a wave stream
}
mInfo.SetFileFormat(eAudioWave);
res = GoToChunk("fmt ");
if (!res)
return false;
//Read all parameters given in "fmt" chunk
if( 1 != mrStream.ReadUInt16(&Format,1))
return false;
if( 1 != mrStream.ReadUInt16(&NbChannels,1))
return false;
if( 1 != mrStream.ReadUInt32(&SamplesPerSec,1))
return false;
if( 1 != mrStream.ReadUInt32(&AvgBytesPerSec,1))
return false;
if( 1 != mrStream.ReadUInt16(&BlockAlign,1))
return false;
if( 1 != mrStream.ReadUInt16(&BitsPerSample,1))
return false;
mInfo.SetFormatTag(Format);
mInfo.SetSampleRate(SamplesPerSec);
mInfo.SetChannels(NbChannels);
mInfo.SetBitsPerSample(BitsPerSample);
//get number of sample frames
for(int32 i = 0; i < mChunks.size(); i++)
{
if(mChunks[i]->CompareId("data")) //attempt to reach "data" Chunk
{
NbSamples = (int32)mChunks[i]->mDataSize;
mInfo.SetSampleFrames(NbSamples * 8 / BitsPerSample / NbChannels);
break;
}
}
mInfo.SetStartFrame(0);
mInfo.SetStopFrame(mInfo.GetSampleFrames());
return true;
}
