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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.
*/
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//
// Note : the buffer must be given in ONE call
//
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//---------------------------------------------------------------------------
// Pre-compilation
#include "MediaInfo/PreComp.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Setup.h"
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#if defined(MEDIAINFO_VORBIS_YES)
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#include "MediaInfo/Audio/File_Vorbis.h"
#include <cmath>
using namespace std;
//---------------------------------------------------------------------------
namespace MediaInfoLib
{
//---------------------------------------------------------------------------
int8u ilog(int32u Value)
{
int8u ToReturn=0;
while(Value)
{
ToReturn++;
Value>>=1;
}
return ToReturn;
}
//***************************************************************************
// Buffer - Per element
//***************************************************************************
//---------------------------------------------------------------------------
void File_Vorbis::Header_Parse()
{
//Filling
Header_Fill_Code(0, "Vorbis");
Header_Fill_Size(Buffer_Size);
}
//---------------------------------------------------------------------------
void File_Vorbis::Data_Parse()
{
//Parsing
if (Status[IsAccepted])
Setup();
else
Identification();
}
//***************************************************************************
// Elements
//***************************************************************************
//---------------------------------------------------------------------------
void File_Vorbis::Identification()
{
Element_Name("Identification");
//Parsing
int32u Version, SamplingRate, BitRate_Maximum, BitRate_Nominal, BitRate_Minimum;
int8u Channels;
Skip_B1 ( "Signature");
Skip_Local(6, "Signature");
Get_L4 (Version, "Version");
if (Version>0)
return; //Not supported
Get_L1 (Channels, "Channels");
Get_L4 (SamplingRate, "SamplingRate");
Get_L4 (BitRate_Maximum, "BitRate_Maximum");
Get_L4 (BitRate_Nominal, "BitRate_Nominal");
Get_L4 (BitRate_Minimum, "BitRate_Minimum");
BS_Begin();
Skip_BS(4, "BlockSize_0"); //2^Value
Skip_BS(4, "BlockSize_1"); //2^Value
BS_End();
Skip_L1( "Framing");
//Filling
FILLING_BEGIN();
Accept("Vorbis");
Stream_Prepare(Stream_Audio);
Fill(Stream_Audio, StreamPos_Last, Audio_Format, "Vorbis");
Fill(Stream_Audio, StreamPos_Last, Audio_Codec, "Vorbis");
if (BitRate_Maximum!=0 && BitRate_Maximum<0x80000000) //This is a signed value, and negative values are not OK
Fill(Stream_Audio, StreamPos_Last, Audio_BitRate_Maximum, BitRate_Maximum);
if (BitRate_Nominal!=0 && BitRate_Nominal<0x80000000) //This is a signed value, and negative values are not OK
Fill(Stream_Audio, StreamPos_Last, Audio_BitRate, BitRate_Nominal);
if (BitRate_Minimum!=0 && BitRate_Minimum<0x80000000) //This is a signed value, and negative values are not OK
Fill(Stream_Audio, StreamPos_Last, Audio_BitRate_Minimum, BitRate_Minimum);
if (BitRate_Nominal && BitRate_Maximum==BitRate_Nominal && BitRate_Nominal==BitRate_Minimum)
Fill(Stream_Audio, StreamPos_Last, Audio_BitRate_Mode, "CBR");
else
Fill(Stream_Audio, StreamPos_Last, Audio_BitRate_Mode, "VBR");
Fill(Stream_Audio, StreamPos_Last, Audio_Channel_s_, Channels);
Fill(Stream_Audio, StreamPos_Last, Audio_SamplingRate, SamplingRate);
FILLING_END();
}
//---------------------------------------------------------------------------
void File_Vorbis::Setup()
{
Element_Name("Setup");
//Parsing
Skip_Local(6, "Signature");
int32u codebook, codebook_dimensions, codebook_entries, ordered, codebook_lookup_type;
int8u vorbis_codebook_count;
Get_L1 (vorbis_codebook_count, "vorbis_codebook_count");
BS_Begin_LE(); //Vorbis bitstream is Little Endian
vorbis_codebook_count+=1;
for (int Pos=0; Pos<vorbis_codebook_count; Pos++)
{
Element_Begin1("codebook");
Get_T4 (24, codebook, "codebook");
if (codebook!=0x564342)
return;
Get_BT (16, codebook_dimensions, "codebook_dimensions");
Get_BT (24, codebook_entries, "codebook_entries");
Get_BT (1, ordered, "ordered");
if (!ordered)
{
int32u sparse;
Get_BT (1, sparse, "sparse");
for (int32u Pos2=0; Pos2<codebook_entries; Pos2++)
{
if (sparse)
{
int32u flag;
Get_BT (1, flag, "flag");
if (flag)
{
Info_BT(5, length, "length");
}
}
else
{
Info_BT(5, length, "length");
}
}
}
else
{
Skip_BT(5, "length");
int32u num;
for(int32u i=0; i<codebook_entries; )
{
Get_BT (ilog(codebook_entries-i), num, "num");
for(int32u j=0; j<num && i<codebook_entries; j++, i++);
}
}
Get_BT (4, codebook_lookup_type, "codebook_lookup_type");
if (codebook_lookup_type>2)
return; //Not decodable
if (codebook_lookup_type>0)
{
int8u codebook_value_bits;
Info_BT(32, codebook_minimum_value, "codebook_minimum_value");
Info_BT(32, codebook_delta_value, "codebook_delta_value");
Get_T1 ( 4, codebook_value_bits, "codebook_value_bits");
codebook_value_bits++;
Info_BT( 1, codebook_sequence_p, "codebook_sequence_p");
int32s vals;
if (codebook_lookup_type==1)
{
vals=(int32u)floor(pow((float)codebook_entries,1.f/codebook_dimensions));
for (;;)
{
int32u acc=1, acc1=1;
for(int32u i=0; i<codebook_dimensions; i++)
{
acc*=vals;
acc1*=vals+1;
}
if(acc<=codebook_entries && acc1>codebook_entries)
break;
else if(acc>codebook_entries)
vals--;
else
vals++;
}
}
else //codebook_lookup_type==2
vals=codebook_entries*codebook_dimensions;
int32u codebook_multiplicands;
for(int i=0; i<vals; i++)
Get_BT (codebook_value_bits, codebook_multiplicands, "codebook_multiplicands");
}
Element_End0();
}
//Time domain transforms
int32u vorbis_time_count;
Get_BT (6, vorbis_time_count, "vorbis_time_count");
for (int32u Pos=0; Pos<vorbis_time_count+1; Pos++)
Skip_BT(16, "zero");
//Floors
int32u vorbis_floor_count;
Get_BT (6, vorbis_floor_count, "vorbis_floor_count");
for (int32u Pos=0; Pos<vorbis_floor_count; Pos++)
{
int16u vorbis_floor_types;
Get_T2(16, vorbis_floor_types, "vorbis_floor_types");
FILLING_BEGIN();
Fill(Stream_Audio, 0, Audio_Format_Settings_Floor, vorbis_floor_types);
Fill(Stream_Audio, 0, Audio_Codec_Settings_Floor, vorbis_floor_types);
if (vorbis_floor_types==0)
{
Fill(Stream_Audio, 0, Audio_Format_Settings, "Floor0");
Fill(Stream_Audio, 0, Audio_Codec_Settings, "Floor0");
}
FILLING_END();
//Must continue parsing...
}
BS_End_LE();
Finish("Vorbis");
}
//***************************************************************************
// C++
//***************************************************************************
} //NameSpace
#endif //MEDIAINFO_VORBIS_YES
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