decoder.h

linux下的MPEG1

/// \file decoder.h

#ifndef _musepack_decoder_h_
#define _musepack_decoder_h_

#include "musepack/huffman.h"
#include "musepack/math.h"
#include "musepack/musepack.h"
#include "musepack/reader.h"
#include "musepack/streaminfo.h"

enum {
    MPC_V_MEM = 2304,
    MPC_DECODER_MEMSIZE = 16384,  // overall buffer size
};

typedef struct {
    mpc_int32_t  L [36];
    mpc_int32_t  R [36];
} QuantTyp;

typedef struct mpc_decoder_t {
    mpc_reader *r;

    /// @name internal state variables
    //@{

    mpc_uint32_t  dword; /// actually decoded 32bit-word
    mpc_uint32_t  pos;   /// bit-position within dword
    mpc_uint32_t  Speicher[MPC_DECODER_MEMSIZE]; /// read-buffer
    mpc_uint32_t  Zaehler; /// actual index within read-buffer

    mpc_uint32_t samples_to_skip;

    mpc_uint32_t  FwdJumpInfo;
    mpc_uint32_t  ActDecodePos;
    mpc_uint32_t  FrameWasValid;

    mpc_uint32_t  DecodedFrames;
    mpc_uint32_t  OverallFrames;
    mpc_int32_t   SampleRate;                 // Sample frequency

    mpc_uint32_t  StreamVersion;              // version of bitstream
    mpc_uint32_t  MS_used;                    // MS-coding used ?
    mpc_int32_t   Max_Band;
    mpc_uint32_t  MPCHeaderPos;               // AB: needed to support ID3v2
    mpc_uint32_t  LastValidSamples;
    mpc_uint32_t  TrueGaplessPresent;

    mpc_uint32_t  EQ_activated;

    mpc_uint32_t  WordsRead;                  // counts amount of decoded dwords

    // randomizer state variables
    mpc_uint32_t  __r1; 
    mpc_uint32_t  __r2; 

    mpc_uint32_t  Q_bit [32];     
    mpc_uint32_t  Q_res [32][16];

    // huffman table stuff
    HuffmanTyp    HuffHdr  [10];
    HuffmanTyp    HuffSCFI [ 4];
    HuffmanTyp    HuffDSCF [16];
    HuffmanTyp*   HuffQ [2] [8];

    HuffmanTyp    HuffQ1 [2] [3*3*3];
    HuffmanTyp    HuffQ2 [2] [5*5];
    HuffmanTyp    HuffQ3 [2] [ 7];
    HuffmanTyp    HuffQ4 [2] [ 9];
    HuffmanTyp    HuffQ5 [2] [15];
    HuffmanTyp    HuffQ6 [2] [31];
    HuffmanTyp    HuffQ7 [2] [63];
    const HuffmanTyp* SampleHuff [18];
    HuffmanTyp    SCFI_Bundle   [ 8];
    HuffmanTyp    DSCF_Entropie [13];
    HuffmanTyp    Region_A [16];
    HuffmanTyp    Region_B [ 8];
    HuffmanTyp    Region_C [ 4];

    HuffmanTyp    Entropie_1 [ 3];
    HuffmanTyp    Entropie_2 [ 5];
    HuffmanTyp    Entropie_3 [ 7];
    HuffmanTyp    Entropie_4 [ 9];
    HuffmanTyp    Entropie_5 [15];
    HuffmanTyp    Entropie_6 [31];
    HuffmanTyp    Entropie_7 [63];

    mpc_int32_t   SCF_Index_L [32] [3];
    mpc_int32_t   SCF_Index_R [32] [3];       // holds scalefactor-indices
    QuantTyp      Q [32];                     // holds quantized samples
    mpc_int32_t   Res_L [32];
    mpc_int32_t   Res_R [32];                 // holds the chosen quantizer for each subband
    mpc_int32_t   DSCF_Flag_L [32];
    mpc_int32_t   DSCF_Flag_R [32];           // differential SCF used?
    mpc_int32_t   SCFI_L [32];
    mpc_int32_t   SCFI_R [32];                // describes order of transmitted SCF
    mpc_int32_t   DSCF_Reference_L [32];
    mpc_int32_t   DSCF_Reference_R [32];      // holds last frames SCF
    mpc_int32_t   MS_Flag[32];                // MS used?
#ifdef MPC_FIXED_POINT
    unsigned char SCF_shift[256];
#endif

    MPC_SAMPLE_FORMAT V_L[MPC_V_MEM + 960];
    MPC_SAMPLE_FORMAT V_R[MPC_V_MEM + 960];
    MPC_SAMPLE_FORMAT Y_L[36][32];
    MPC_SAMPLE_FORMAT Y_R[36][32];
    MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
    //@}

} mpc_decoder;

#endif // _mpc_decoder_h