apps/codecs/libmusepack/decoder.h

   1 /*
   2   Copyright (c) 2005, The Musepack Development Team
   3   All rights reserved.
   4
   5   Redistribution and use in source and binary forms, with or without
   6   modification, are permitted provided that the following conditions are
   7   met:
   8
   9   * Redistributions of source code must retain the above copyright
  10   notice, this list of conditions and the following disclaimer.
  11
  12   * Redistributions in binary form must reproduce the above
  13   copyright notice, this list of conditions and the following
  14   disclaimer in the documentation and/or other materials provided
  15   with the distribution.
  16
  17   * Neither the name of the The Musepack Development Team nor the
  18   names of its contributors may be used to endorse or promote
  19   products derived from this software without specific prior
  20   written permission.
  21
  22   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34
  35 /// \file decoder.h
  36
  37 #ifndef _mpcdec_decoder_h_
  38 #define _mpcdec_decoder_h_
  39
  40 #include "huffman.h"
  41 #include "math.h"
  42 #include "musepack.h"
  43 #include "reader.h"
  44 #include "streaminfo.h"
  45
  46 //#define MPC_SUPPORT_SV456
  47 #define SCF_HACK
  48
  49 enum {
  50     MPC_V_MEM = 2304,
  51     MPC_DECODER_MEMSIZE = 16384,  // overall buffer size
  52 };
  53
  54 typedef struct {
  55     mpc_int16_t  L [36];
  56     mpc_int16_t  R [36];
  57 } QuantTyp;
  58
  59 typedef struct mpc_decoder_t {
  60     mpc_reader *r;
  61
  62     /// @name internal state variables
  63     //@{
  64
  65     mpc_uint32_t  next;
  66     mpc_uint32_t  dword; /// currently decoded 32bit-word
  67     mpc_uint32_t  pos;   /// bit-position within dword
  68     mpc_uint32_t  *Speicher; /// read-buffer
  69     mpc_uint32_t  Zaehler; /// actual index within read-buffer
  70     mpc_uint32_t  Ring;
  71
  72     mpc_uint32_t  samples_to_skip;
  73     mpc_uint32_t  last_block_samples;
  74     mpc_uint32_t  FwdJumpInfo;
  75     mpc_uint32_t  ActDecodePos;
  76
  77
  78     mpc_uint32_t  DecodedFrames;
  79     mpc_uint32_t  OverallFrames;
  80     mpc_uint32_t  MaxDecodedFrames;           // Maximum frames decoded (indicates usable seek table entries)
  81     mpc_uint16_t  SeekTableIndex;
  82     mpc_uint32_t  SeekTableCounter;
  83     mpc_int32_t   SampleRate;                 // Sample frequency
  84
  85     mpc_uint32_t  StreamVersion;              // version of bitstream
  86     mpc_int32_t   Max_Band;
  87     mpc_uint32_t  MPCHeaderPos;               // AB: needed to support ID3v2
  88
  89     mpc_uint32_t  FrameWasValid;
  90     mpc_uint32_t  MS_used;                    // MS-coding used ?
  91     mpc_uint32_t  TrueGaplessPresent;
  92
  93     mpc_uint32_t  WordsRead;                  // counts amount of decoded dwords
  94
  95     // randomizer state variables
  96     mpc_uint32_t  __r1;
  97     mpc_uint32_t  __r2;
  98
  99     mpc_int8_t    SCF_Index_L [32] [3];
 100     mpc_int8_t    SCF_Index_R [32] [3];       // holds scalefactor-indices
 101     QuantTyp      Q [32];                     // holds quantized samples
 102     mpc_int8_t    Res_L [32];
 103     mpc_int8_t    Res_R [32];                 // holds the chosen quantizer for each subband
 104 #ifdef MPC_SUPPORT_SV456
 105     mpc_bool_t    DSCF_Flag_L [32];
 106     mpc_bool_t    DSCF_Flag_R [32];           // differential SCF used?
 107 #endif
 108     mpc_int8_t    SCFI_L [32];
 109     mpc_int8_t    SCFI_R [32];                // describes order of transmitted SCF
 110     mpc_bool_t    MS_Flag[32];                // MS used?
 111
 112     mpc_uint32_t* SeekTable;
 113     mpc_uint8_t   SeekTable_Step;
 114
 115 #ifdef MPC_FIXED_POINT
 116     mpc_uint8_t   SCF_shift[256];
 117 #endif
 118
 119     MPC_SAMPLE_FORMAT V_L[MPC_V_MEM + 960];
 120     MPC_SAMPLE_FORMAT V_R[MPC_V_MEM + 960];
 121     MPC_SAMPLE_FORMAT (*Y_L)[32];
 122     MPC_SAMPLE_FORMAT (*Y_R)[32];
 123     MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
 124     //@}
 125
 126 } mpc_decoder;
 127
 128 #endif // _mpc_decoder_h