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cog/Libraries/MAC/Files/Source/MACLib/APEInfo.cpp

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/*****************************************************************************************
CAPEInfo:
-a class to make working with APE files and getting information about them simple
*****************************************************************************************/
#include "All.h"
#include "APEInfo.h"
#include IO_HEADER_FILE
#include "APECompress.h"
#include "APEHeader.h"
#include "CharacterHelper.h"
/*****************************************************************************************
Construction
*****************************************************************************************/
CAPEInfo::CAPEInfo(int * pErrorCode, const char * pFilename, CAPETag * pTag)
{
*pErrorCode = ERROR_SUCCESS;
CloseFile();
// open the file
m_spIO.Assign(new IO_CLASS_NAME);
if (m_spIO->Open(pFilename) != 0)
{
CloseFile();
*pErrorCode = ERROR_INVALID_INPUT_FILE;
return;
}
// get the file information
if (GetFileInformation(TRUE) != 0)
{
CloseFile();
*pErrorCode = ERROR_INVALID_INPUT_FILE;
return;
}
// get the tag (do this second so that we don't do it on failure)
if (pTag == NULL)
{
// we don't want to analyze right away for non-local files
// since a single I/O object is shared, we can't tag and read at the same time (i.e. in multiple threads)
BOOL bAnalyzeNow = TRUE;
if ((strncasecmp(pFilename, "http://", 7) == 0) || (strncasecmp(pFilename, "m01p://", 7) == 0))
bAnalyzeNow = FALSE;
m_spAPETag.Assign(new CAPETag(m_spIO, bAnalyzeNow));
}
else
{
m_spAPETag.Assign(pTag);
}
}
CAPEInfo::CAPEInfo(int * pErrorCode, CIO * pIO, CAPETag * pTag)
{
*pErrorCode = ERROR_SUCCESS;
CloseFile();
m_spIO.Assign(pIO, FALSE, FALSE);
// get the file information
if (GetFileInformation(TRUE) != 0)
{
CloseFile();
*pErrorCode = ERROR_INVALID_INPUT_FILE;
return;
}
// get the tag (do this second so that we don't do it on failure)
if (pTag == NULL)
m_spAPETag.Assign(new CAPETag(m_spIO, TRUE));
else
m_spAPETag.Assign(pTag);
}
/*****************************************************************************************
Destruction
*****************************************************************************************/
CAPEInfo::~CAPEInfo()
{
CloseFile();
}
/*****************************************************************************************
Close the file
*****************************************************************************************/
int CAPEInfo::CloseFile()
{
m_spIO.Delete();
m_APEFileInfo.spWaveHeaderData.Delete();
m_APEFileInfo.spSeekBitTable.Delete();
m_APEFileInfo.spSeekByteTable.Delete();
m_APEFileInfo.spAPEDescriptor.Delete();
m_spAPETag.Delete();
// re-initialize variables
m_APEFileInfo.nSeekTableElements = 0;
m_bHasFileInformationLoaded = FALSE;
return ERROR_SUCCESS;
}
/*****************************************************************************************
Get the file information about the file
*****************************************************************************************/
int CAPEInfo::GetFileInformation(BOOL bGetTagInformation)
{
// quit if there is no simple file
if (m_spIO == NULL) { return -1; }
// quit if the file information has already been loaded
if (m_bHasFileInformationLoaded) { return ERROR_SUCCESS; }
// use a CAPEHeader class to help us analyze the file
CAPEHeader APEHeader(m_spIO);
int nRetVal = APEHeader.Analyze(&m_APEFileInfo);
// update our internal state
if (nRetVal == ERROR_SUCCESS){
m_bHasFileInformationLoaded = TRUE;
}
// return
return nRetVal;
}
/*****************************************************************************************
Primary query function
*****************************************************************************************/
int CAPEInfo::GetInfo(APE_DECOMPRESS_FIELDS Field, int nParam1, int nParam2)
{
int nRetVal = -1;
switch (Field)
{
case APE_INFO_FILE_VERSION:
nRetVal = m_APEFileInfo.nVersion;
break;
case APE_INFO_COMPRESSION_LEVEL:
nRetVal = m_APEFileInfo.nCompressionLevel;
break;
case APE_INFO_FORMAT_FLAGS:
nRetVal = m_APEFileInfo.nFormatFlags;
break;
case APE_INFO_SAMPLE_RATE:
nRetVal = m_APEFileInfo.nSampleRate;
break;
case APE_INFO_BITS_PER_SAMPLE:
nRetVal = m_APEFileInfo.nBitsPerSample;
break;
case APE_INFO_BYTES_PER_SAMPLE:
nRetVal = m_APEFileInfo.nBytesPerSample;
break;
case APE_INFO_CHANNELS:
nRetVal = m_APEFileInfo.nChannels;
break;
case APE_INFO_BLOCK_ALIGN:
nRetVal = m_APEFileInfo.nBlockAlign;
break;
case APE_INFO_BLOCKS_PER_FRAME:
nRetVal = m_APEFileInfo.nBlocksPerFrame;
break;
case APE_INFO_FINAL_FRAME_BLOCKS:
nRetVal = m_APEFileInfo.nFinalFrameBlocks;
break;
case APE_INFO_TOTAL_FRAMES:
nRetVal = m_APEFileInfo.nTotalFrames;
break;
case APE_INFO_WAV_HEADER_BYTES:
nRetVal = m_APEFileInfo.nWAVHeaderBytes;
break;
case APE_INFO_WAV_TERMINATING_BYTES:
nRetVal = m_APEFileInfo.nWAVTerminatingBytes;
break;
case APE_INFO_WAV_DATA_BYTES:
nRetVal = m_APEFileInfo.nWAVDataBytes;
break;
case APE_INFO_WAV_TOTAL_BYTES:
nRetVal = m_APEFileInfo.nWAVTotalBytes;
break;
case APE_INFO_APE_TOTAL_BYTES:
nRetVal = m_APEFileInfo.nAPETotalBytes;
break;
case APE_INFO_TOTAL_BLOCKS:
nRetVal = m_APEFileInfo.nTotalBlocks;
break;
case APE_INFO_LENGTH_MS:
nRetVal = m_APEFileInfo.nLengthMS;
break;
case APE_INFO_AVERAGE_BITRATE:
nRetVal = m_APEFileInfo.nAverageBitrate;
break;
case APE_INFO_FRAME_BITRATE:
{
int nFrame = nParam1;
nRetVal = 0;
int nFrameBytes = GetInfo(APE_INFO_FRAME_BYTES, nFrame);
int nFrameBlocks = GetInfo(APE_INFO_FRAME_BLOCKS, nFrame);
if ((nFrameBytes > 0) && (nFrameBlocks > 0) && m_APEFileInfo.nSampleRate > 0)
{
int nFrameMS = (nFrameBlocks * 1000) / m_APEFileInfo.nSampleRate;
if (nFrameMS != 0)
{
nRetVal = (nFrameBytes * 8) / nFrameMS;
}
}
break;
}
case APE_INFO_DECOMPRESSED_BITRATE:
nRetVal = m_APEFileInfo.nDecompressedBitrate;
break;
case APE_INFO_PEAK_LEVEL:
nRetVal = -1; // no longer supported
break;
case APE_INFO_SEEK_BIT:
{
int nFrame = nParam1;
if (GET_FRAMES_START_ON_BYTES_BOUNDARIES(this))
{
nRetVal = 0;
}
else
{
if (nFrame < 0 || nFrame >= m_APEFileInfo.nTotalFrames)
nRetVal = 0;
else
nRetVal = m_APEFileInfo.spSeekBitTable[nFrame];
}
break;
}
case APE_INFO_SEEK_BYTE:
{
int nFrame = nParam1;
if (nFrame < 0 || nFrame >= m_APEFileInfo.nTotalFrames)
nRetVal = 0;
else
nRetVal = m_APEFileInfo.spSeekByteTable[nFrame] + m_APEFileInfo.nJunkHeaderBytes;
break;
}
case APE_INFO_WAV_HEADER_DATA:
{
char * pBuffer = (char *) nParam1;
int nMaxBytes = nParam2;
if (m_APEFileInfo.nFormatFlags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)
{
if (sizeof(WAVE_HEADER) > nMaxBytes)
{
nRetVal = -1;
}
else
{
WAVEFORMATEX wfeFormat; GetInfo(APE_INFO_WAVEFORMATEX, (int) &wfeFormat, 0);
WAVE_HEADER WAVHeader; FillWaveHeader(&WAVHeader, m_APEFileInfo.nWAVDataBytes, &wfeFormat,
m_APEFileInfo.nWAVTerminatingBytes);
WAVHeader.nRIFFBytes = swap_endian32(WAVHeader.nRIFFBytes);
WAVHeader.nFormatBytes = swap_endian32(WAVHeader.nFormatBytes);
WAVHeader.nFormatTag = swap_endian16(WAVHeader.nFormatTag);
WAVHeader.nChannels = swap_endian16(WAVHeader.nChannels);
WAVHeader.nSamplesPerSec = swap_endian32(WAVHeader.nSamplesPerSec);
WAVHeader.nAvgBytesPerSec = swap_endian32(WAVHeader.nAvgBytesPerSec);
WAVHeader.nBlockAlign = swap_endian16(WAVHeader.nBlockAlign);
WAVHeader.nBitsPerSample = swap_endian16(WAVHeader.nBitsPerSample);
WAVHeader.nDataBytes = swap_endian32(WAVHeader.nDataBytes);
memcpy(pBuffer, &WAVHeader, sizeof(WAVE_HEADER));
nRetVal = 0;
}
}
else
{
if (m_APEFileInfo.nWAVHeaderBytes > nMaxBytes)
{
nRetVal = -1;
}
else
{
memcpy(pBuffer, m_APEFileInfo.spWaveHeaderData, m_APEFileInfo.nWAVHeaderBytes);
nRetVal = 0;
}
}
break;
}
case APE_INFO_WAV_TERMINATING_DATA:
{
char * pBuffer = (char *) nParam1;
int nMaxBytes = nParam2;
if (m_APEFileInfo.nWAVTerminatingBytes > nMaxBytes)
{
nRetVal = -1;
}
else
{
if (m_APEFileInfo.nWAVTerminatingBytes > 0)
{
// variables
int nOriginalFileLocation = m_spIO->GetPosition();
unsigned int nBytesRead = 0;
// check for a tag
m_spIO->Seek(-(m_spAPETag->GetTagBytes() + m_APEFileInfo.nWAVTerminatingBytes), FILE_END);
m_spIO->Read(pBuffer, m_APEFileInfo.nWAVTerminatingBytes, &nBytesRead);
// restore the file pointer
m_spIO->Seek(nOriginalFileLocation, FILE_BEGIN);
}
nRetVal = 0;
}
break;
}
case APE_INFO_WAVEFORMATEX:
{
WAVEFORMATEX * pWaveFormatEx = (WAVEFORMATEX *) nParam1;
FillWaveFormatEx(pWaveFormatEx, m_APEFileInfo.nSampleRate, m_APEFileInfo.nBitsPerSample, m_APEFileInfo.nChannels);
nRetVal = 0;
break;
}
case APE_INFO_IO_SOURCE:
nRetVal = (int) m_spIO.GetPtr();
break;
case APE_INFO_FRAME_BYTES:
{
int nFrame = nParam1;
// bound-check the frame index
if ((nFrame < 0) || (nFrame >= m_APEFileInfo.nTotalFrames))
{
nRetVal = -1;
}
else
{
if (nFrame != (m_APEFileInfo.nTotalFrames - 1))
nRetVal = GetInfo(APE_INFO_SEEK_BYTE, nFrame + 1) - GetInfo(APE_INFO_SEEK_BYTE, nFrame);
else
nRetVal = m_spIO->GetSize() - m_spAPETag->GetTagBytes() - m_APEFileInfo.nWAVTerminatingBytes - GetInfo(APE_INFO_SEEK_BYTE, nFrame);
}
break;
}
case APE_INFO_FRAME_BLOCKS:
{
int nFrame = nParam1;
// bound-check the frame index
if ((nFrame < 0) || (nFrame >= m_APEFileInfo.nTotalFrames))
{
nRetVal = -1;
}
else
{
if (nFrame != (m_APEFileInfo.nTotalFrames - 1))
nRetVal = m_APEFileInfo.nBlocksPerFrame;
else
nRetVal = m_APEFileInfo.nFinalFrameBlocks;
}
break;
}
case APE_INFO_TAG:
nRetVal = (int) m_spAPETag.GetPtr();
break;
case APE_INTERNAL_INFO:
nRetVal = (int) &m_APEFileInfo;
break;
}
return nRetVal;
}
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