/*  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