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/* Copyright (c) MediaArea.net SARL. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license that can
* be found in the License.html file in the root of the source tree.
*/
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Information about MPEG-4 ALS files
// http://www.nue.tu-berlin.de/forschung/projekte/lossless/mp4als.html
// http://wiki.multimedia.cx/index.php?title=MPEG-4_Audio_Lossless_Coding_%28ALS%29
//
// Contributor: Lionel Duchateau, kurtnoise@free.fr
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//---------------------------------------------------------------------------
// Pre-compilation
#include "MediaInfo/PreComp.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Setup.h"
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#if defined(MEDIAINFO_ALS_YES)
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Audio/File_Als.h"
//---------------------------------------------------------------------------
namespace MediaInfoLib
{
//***************************************************************************
// Constructor/Destructor
//***************************************************************************
//---------------------------------------------------------------------------
File_Als::File_Als()
:File__Analyze(), File__Tags_Helper()
{
//File__Tags_Helper
Base=this;
}
//***************************************************************************
// Streams management
//***************************************************************************
//---------------------------------------------------------------------------
void File_Als::Streams_Finish()
{
//Filling
int64u CompressedSize=File_Size-TagsSize;
float32 CompressionRatio=((float32)UncompressedSize)/CompressedSize;
Fill(Stream_Audio, 0, Audio_StreamSize, CompressedSize);
Fill(Stream_Audio, 0, Audio_Compression_Ratio, CompressionRatio);
File__Tags_Helper::Streams_Finish();
}
//***************************************************************************
// Buffer - File header
//***************************************************************************
//---------------------------------------------------------------------------
bool File_Als::FileHeader_Begin()
{
if (!File__Tags_Helper::FileHeader_Begin())
return false;
//Synchro
if (Buffer_Size<4)
return false;
if (Buffer[0]!=0x41 //"ALS\0"
|| Buffer[1]!=0x4C
|| Buffer[2]!=0x53
|| Buffer[3]!=0x00)
{
File__Tags_Helper::Reject("ALS");
return false;
}
return true;
}
//---------------------------------------------------------------------------
void File_Als::FileHeader_Parse()
{
//Parsing
int32u SampleRate, Samples;
int16u Channels;
int8u BitsPerSample, FileType;
Skip_C4( "signature");
Get_B4 (SampleRate, "sample rate");
Get_B4 (Samples, "samples");
Get_B2 (Channels, "channels-1"); Param_Info2(Channels+1, " channel(s)");
BS_Begin();
Get_S1 (3, FileType, "file type"); // WAV, RIFF, AIFF
Get_S1 (3, BitsPerSample, "bits per sample"); Param_Info2((BitsPerSample+1)*8, " bits");
Skip_SB( "floating point");
Skip_SB( "samples are big-endian");
BS_End();
FILLING_BEGIN();
if (SampleRate==0)
return;
Duration=((int64u)Samples)*1000/SampleRate;
if (Duration==0)
return;
UncompressedSize=((int64u)Samples)*Channels*(BitsPerSample+1/8);
if (UncompressedSize==0)
return;
File__Tags_Helper::Accept("ALS");
File__Tags_Helper::Stream_Prepare(Stream_Audio);
Fill(Stream_Audio, 0, Audio_Format, "ALS");
Fill(Stream_Audio, 0, Audio_Codec, "ALS");
Fill(Stream_Audio, 0, Audio_BitDepth, (BitsPerSample+1)*8);
Fill(Stream_Audio, StreamPos_Last, Audio_Channel_s_, Channels+1);
Fill(Stream_Audio, StreamPos_Last, Audio_SamplingRate, SampleRate);
Fill(Stream_Audio, 0, Audio_Duration, Duration);
//No more need data
File__Tags_Helper::Finish("ALS");
FILLING_END();
}
//***************************************************************************
// C++
//***************************************************************************
} //NameSpace
#endif //MEDIAINFO_ALS_YES
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