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pvmf_wav_parser.cpp
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pvmf_wav_parser.cpp
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/* ------------------------------------------------------------------
* Copyright (C) 1998-2010 PacketVideo
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied.
* See the License for the specific language governing permissions
* and limitations under the License.
* -------------------------------------------------------------------
*/
#ifndef PVMF_WAV_PARSER_H_INCLUDED
#include "pvmf_wav_parser.h"
#endif
#ifndef PVMF_FILEPARSER_OBSERVER_H_INCLUDED
#include "pvmf_fileparser_observer.h"
#endif
#ifndef PVLOGGER_H_INCLUDED
#include "pvlogger.h"
#endif
#define LOG_DEBUG_MSG(msg) PVLOGGER_LOGMSG(PVLOGMSG_INST_LLDBG, ipLogger, PVLOGMSG_STACK_TRACE, msg)
#define BYTES_TO_RECOGNIZE 12
#define BYTES_TO_READ_FMT_CHNK 24
const short MuLawDecompressTable[256] =
{
-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
const short ALawDecompressTable[256] =
{
-5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
-7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
-2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
-3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
-22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
-30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
-11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472,
-15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
-344, -328, -376, -360, -280, -264, -312, -296,
-472, -456, -504, -488, -408, -392, -440, -424,
-88, -72, -120, -104, -24, -8, -56, -40,
-216, -200, -248, -232, -152, -136, -184, -168,
-1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
-1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
-688, -656, -752, -720, -560, -528, -624, -592,
-944, -912, -1008, -976, -816, -784, -880, -848,
5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
344, 328, 376, 360, 280, 264, 312, 296,
472, 456, 504, 488, 408, 392, 440, 424,
88, 72, 120, 104, 24, 8, 56, 40,
216, 200, 248, 232, 152, 136, 184, 168,
1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
688, 656, 752, 720, 560, 528, 624, 592,
944, 912, 1008, 976, 816, 784, 880, 848
};
PVMFWavParser::PVMFWavParser()
{
iDataStream = NULL;
pParserUser = NULL;
iClipSize = 0;
iLittleEndian = false;
iClipFmt = PVMF_UNKNOWN;
iBitsPerSample = 16;
iChannels = 0;
iSamplesPerSec = 0;
iBytesPerSample = 0;
iStartOffset = 0;
iDuration = 0;
pLawTable = NULL;
iEndDataChnkOffset = 0;
iFramesRead = 0;
iEOSReached = false;
ipLogger = PVLogger::GetLoggerObject("wavparser");
iBytesPerSec = 0;
iWavDataReadPerFrame = 0;
}
PVMFWavParser::~PVMFWavParser()
{
ipLogger = NULL;
}
bool PVMFWavParser::Init(PvmiDataStreamInterface *aDataStream, int64 &aDuration, uint32& aTimescale,
PVMFParserFlags aFlags)
{
LOG_DEBUG_MSG((0, "PVMFWavParser::Init In..."));
iDataStream = aDataStream;
if (pParserUser)
iDataStream->SetCallbackHandler(this);
PvmiDataStreamStatus status = iDataStream->GetFileSize(iClipSize);
if (PVDS_SUCCESS != status || 0 == iClipSize)
{
LOG_DEBUG_MSG((0, "WavParser Init: DS GetFileSize failed OR Not a valid Clip"));
return false;
}
LOG_DEBUG_MSG((0, "WavParser Init: Valid ClipSize %d", iClipSize));
// Now validate the clip
uint8 buffer[BYTES_TO_RECOGNIZE + BYTES_TO_READ_FMT_CHNK];
OsclSizeT size = BYTES_TO_RECOGNIZE;
OsclOffsetT fileOffset = 0;
if (PVDS_SUCCESS != iDataStream->ReadAtOffset(0, buffer, size, fileOffset))
{
LOG_DEBUG_MSG((0, "WavParser Init: DS ReadAtOffset failed @Offset %d", fileOffset));
return false;
}
fileOffset += size;
if ('R' == buffer[0] &&
'I' == buffer[1] &&
'F' == buffer[2] &&
'F' == buffer[3])
// Little Endian format
iLittleEndian = true;
else if ('R' == buffer[0] &&
'I' == buffer[1] &&
'F' == buffer[2] &&
'X' == buffer[3])
// Big Endian Format
iLittleEndian = false;
else
return false;
// Check the WAVE Tag
if ('W' != buffer[8] ||
'A' != buffer[9] ||
'V' != buffer[10] ||
'E' != buffer[11])
{
// InValid wav tag
return false;
}
// Get the format chunk now
bool fmtChnkFound = false;
uint32 subChunkSize = 0;
size = 8;
while (!fmtChnkFound)
{
if (PVDS_SUCCESS != iDataStream->ReadAtOffset(0, buffer, size, fileOffset))
{
LOG_DEBUG_MSG((0, "WavParser Init: DS ReadAtOffset failed @Offset %d", fileOffset));
return false;
}
fileOffset += size;
subChunkSize = ((buffer[7] << 24) | (buffer[6] << 16) | (buffer[5] << 8) | (buffer[4]));
if ('f' == buffer[0] &&
'm' == buffer[1] &&
't' == buffer[2] &&
' ' == buffer[3])
{
fmtChnkFound = true;
break;
}
fileOffset += subChunkSize;
}
// We have found the fmt tag, now get the parameters
size = BYTES_TO_READ_FMT_CHNK - 8;
if (PVDS_SUCCESS != iDataStream->ReadAtOffset(0, buffer + 8, size, fileOffset))
{
LOG_DEBUG_MSG((0, "WavParser Init: DS ReadAtOffset failed @Offset %d", fileOffset));
return false;
}
fileOffset += size;
uint16 audioFmt = ((buffer[9] << 8) | (buffer[8]));
if (WAV_FORMAT_PCM == audioFmt)
{
// Data is Pulse Code Modulated
// Read the fmt specific fields, for PCM read BitsPerSample
iBitsPerSample = ((buffer[23] << 8) | (buffer[22]));
iClipFmt = PVMF_WAV_PCM;
}
else if (WAV_FORMAT_MULAW == audioFmt)
{
pLawTable = (short*)MuLawDecompressTable;
iClipFmt = PVMF_WAV_MULAW;
}
else if (WAV_FORMAT_ALAW == audioFmt)
{
pLawTable = (short*)ALawDecompressTable;
iClipFmt = PVMF_WAV_ALAW;
}
else
{
LOG_DEBUG_MSG((0, "PVMFWavParser::Init Unsupported Audio Format"));
return false;
}
uint16 BlockAlign = 0;
uint32 AvgBytesPerSec = 0;
iChannels = ((buffer[11] << 8) | (buffer[10]));
iSamplesPerSec = ((buffer[15] << 24) | (buffer[14] << 16) | (buffer[13] << 8) | (buffer[12]));
AvgBytesPerSec = ((buffer[19] << 24) | (buffer[18] << 16) | (buffer[17] << 8) | (buffer[16]));
BlockAlign = ((buffer[21] << 8) | (buffer[20]));
iBytesPerSample = (iBitsPerSample + 7) / 8;
LOG_DEBUG_MSG((0, "PVMFWavParser::Init Parameters Read from file: audioFmt %d, iChannels %d, iSamplesPerSec %d,\
AvgBytesPerSec %d, BlockAlign %d, iBitsPerSample %d ", audioFmt, iChannels, iSamplesPerSec, AvgBytesPerSec, BlockAlign, iBitsPerSample));
// Update the fileOffset based on SubChunkSize
// For PCM subChunkSize is 16
if (16 != subChunkSize)
fileOffset += (subChunkSize - 16);
// Now look for the data chunk
bool dataChnkFound = false;
size = 8; // Read just 8 bytes to get the data chunk and size
subChunkSize = 0;
while (!dataChnkFound)
{
if (PVDS_SUCCESS != iDataStream->ReadAtOffset(0, buffer, size, fileOffset))
{
LOG_DEBUG_MSG((0, "WavParser Init: DS ReadAtOffset failed @Offset %d", fileOffset));
return false;
}
fileOffset += size;
subChunkSize = (((int32)buffer[7] << 24) | ((int32)buffer[6] << 16) | ((int32)buffer[5] << 8) | (buffer[4]));
if ('d' == buffer[0] &&
'a' == buffer[1] &&
't' == buffer[2] &&
'a' == buffer[3])
{
dataChnkFound = true;
break;
}
fileOffset += subChunkSize;
}
iStartOffset = fileOffset;
iDataStream->Seek(0, iStartOffset, PVDS_SEEK_SET);
iEndDataChnkOffset = fileOffset + subChunkSize;
iBytesPerSec = iBytesPerSample * iSamplesPerSec * iChannels;
aDuration = iDuration = ((iEndDataChnkOffset - iStartOffset) / iBytesPerSec) * 1000;
aTimescale = 1000;
return true;
}
PVMFParserReturnCode PVMFWavParser::GetNextAccessUnits(GAU* aGau)
{
LOG_DEBUG_MSG((0, "PVMFWavParser::GetNextAccessUnits In"));
PvmiDataStreamStatus status = PVDS_FAILURE;
PVMFParserReturnCode retStatus = PVMFParserEverythingFine;
// Check if the buffer provided is big enough to hold the data
OsclSizeT sizeInBytes = aGau->NumberOfFrames * iBytesPerSample * iChannels;
if (sizeInBytes > aGau->BufferLen)
return PVMFParserInSufficientBuffer;
OsclOffsetT filePos = iDataStream->GetCurrentPointerPosition(0);
if ((filePos + (OsclOffsetT)aGau->BufferLen) > iEndDataChnkOffset)
{
sizeInBytes = iEndDataChnkOffset - filePos;
// last segment to read
iEOSReached = true;
}
LOG_DEBUG_MSG((0, "PVMFWavParser: Bytes to be read %d", sizeInBytes));
status = iDataStream->Read(0, aGau->MediaBuffer, sizeInBytes);
if (PVDS_SUCCESS == status)
{
iWavDataReadPerFrame = sizeInBytes;
aGau->info[0].len = sizeInBytes;
uint32 wavDataReadinMsec = (sizeInBytes * 1000) / iBytesPerSec;
aGau->info[0].ts = (iFramesRead * wavDataReadinMsec);
iFramesRead++;
if (pLawTable)
{
uint8* srcBuf = &(aGau->MediaBuffer[sizeInBytes-1]);
short* destBuf = &(((short*)aGau->MediaBuffer)[sizeInBytes-1]);
for (uint32 ii = sizeInBytes; ii > 0; ii--)
*destBuf-- = pLawTable[*srcBuf--];
}
if (iEOSReached)
retStatus = PVMFParserInSufficientData;
}
else if (PVDS_PENDING == status)
{
LOG_DEBUG_MSG((0, "DS returned Pending, means it need more data to process further read, wait for callback"));
// Check if there is an observer of this class
if (NULL != pParserUser)
{
iGau = aGau;
return PVMFParserPending;
}
// No observer, break out of the loop and just return success with already read samples
LOG_DEBUG_MSG((0, "No observer, just return success with already read samples"));
}
else if (PVDS_END_OF_STREAM == status)
{
retStatus = PVMFParserInSufficientData;
}
else
{
retStatus = PVMFParserDefaultErr;
}
aGau->BufferLen = sizeInBytes;
aGau->NumberOfFrames = 1; // All samples combined in 1 frame
LOG_DEBUG_MSG((0, "PVMFWavParser::GetNextAccessUnits Out, bytesRead %d, FramesRead %d", sizeInBytes, iFramesRead));
return retStatus;
}
PVMFParserReturnCode PVMFWavParser::Seek(int64 aSeekAt, int64& aSeekedTo)
{
LOG_DEBUG_MSG((0, "PVMFWavParser: Seek In, seekAt %d", aSeekAt));
// Get the file offset toSeekTo
OsclOffsetT offsetSeekAt = ((aSeekAt * iSamplesPerSec) / 1000) * iBytesPerSample * iChannels;
// Now add the start offset
offsetSeekAt += iStartOffset;
if (offsetSeekAt > iEndDataChnkOffset)
{
// Seek point beyond end of data, cap it to end of data
offsetSeekAt = iEndDataChnkOffset;
}
if (PVDS_SUCCESS != iDataStream->Seek(0, offsetSeekAt, PVDS_SEEK_SET))
{
LOG_DEBUG_MSG((0, "PVMFWavParser:Seek Failed"));
return PVMFParserIOErr;
}
// Seek on Datastream succedded, means we did seeked to offsetSeekAt, which means SeekAt msecs
aSeekedTo = aSeekAt;
// Set the FramesRead accordingly
if (iWavDataReadPerFrame > 0)
iFramesRead = aSeekedTo / iWavDataReadPerFrame;
// Reset EOS Boolean
iEOSReached = false;
LOG_DEBUG_MSG((0, "PVMFWavParser: Seek Out, seekedTo %d", aSeekedTo));
return PVMFParserEverythingFine;
}
void PVMFWavParser::SetCallbackHandler(PVMFFileParserObserver* aParserUser)
{
pParserUser = aParserUser;
if (iDataStream)
iDataStream->SetCallbackHandler(this);
}
void PVMFWavParser::NotifyDataAvailable(OsclSizeT bytesRead, PvmiDataStreamStatus aStatus)
{
LOG_DEBUG_MSG((0, "PVMFWavParser::NotifyDataAvailable DS returned with last read complete"));
if (NULL == pParserUser)
{
// No observer for Parser so just return.
LOG_DEBUG_MSG((0, "No observer for Parser so just return"));
return;
}
PVMFParserReturnCode retStatus = PVMFParserDefaultErr;
if (PVDS_SUCCESS == aStatus)
{
iWavDataReadPerFrame = bytesRead;
iGau->info[0].len = bytesRead;
uint32 wavDataReadinMsec = (bytesRead * 1000) / iBytesPerSec;
iGau->info[0].ts = (iFramesRead * wavDataReadinMsec);
iFramesRead++;
if (pLawTable)
{
uint8* srcBuf = &(iGau->MediaBuffer[bytesRead-1]);
short* destBuf = &(((short*)iGau->MediaBuffer)[bytesRead-1]);
for (uint32 ii = bytesRead; ii > 0; ii--)
*destBuf-- = pLawTable[*srcBuf--];
}
iGau->BufferLen = bytesRead;
iGau->NumberOfFrames = 1; // All samples combined in 1 frame
retStatus = PVMFParserEverythingFine;
if (iEOSReached)
retStatus = PVMFParserInSufficientData;
}
// Data available at data stream, send the data to the user
pParserUser->CallbackHandler(iGau, retStatus);
}
void PVMFWavParser::RetrieveFileInfo(PVFileInfo& aFileInfo)
{
aFileInfo.AudioTrkInfo.SamplingRate = iSamplesPerSec;
aFileInfo.AudioTrkInfo.NoOfChannels = iChannels;
aFileInfo.AudioTrkInfo.BitRate = iBitsPerSample * iSamplesPerSec;
aFileInfo.AudioTrkInfo.AudioFmt = iClipFmt;
aFileInfo.AudioTrkInfo.TrackDuration = iDuration;
aFileInfo.AudioTrkInfo.TrackTimescale = 1000;
aFileInfo.AudioTrkInfo.LittleEndian = iLittleEndian;
aFileInfo.AudioPresent = true;
}