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 "mpcdec.h" 43 #include "reader.h" 44 #include "streaminfo.h" 45 46 #define MPC_SUPPORT_SV456 47 48 #define SEEKING_TABLE_SIZE 256u 49 // set it to SLOW_SEEKING_WINDOW to not use fast seeking 50 #define FAST_SEEKING_WINDOW 32 51 // set it to FAST_SEEKING_WINDOW to only use fast seeking 52 #define SLOW_SEEKING_WINDOW 0x80000000 53 54 enum { 55 MPC_V_MEM = 2304, 56 MPC_DECODER_MEMSIZE = 16384, // overall buffer size 57 }; 58 59 typedef struct { 60 mpc_int32_t L [36]; 61 mpc_int32_t R [36]; 62 } QuantTyp; 63 64 typedef struct mpc_decoder_t { 65 mpc_reader *r; 66 67 /// @name internal state variables 68 //@{ 69 70 mpc_uint32_t dword; /// currently decoded 32bit-word 71 mpc_uint32_t pos; /// bit-position within dword 72 mpc_uint32_t Speicher[MPC_DECODER_MEMSIZE]; /// read-buffer 73 mpc_uint32_t Zaehler; /// actual index within read-buffer 74 75 mpc_uint32_t samples_to_skip; 76 77 mpc_uint32_t DecodedFrames; 78 mpc_uint32_t OverallFrames; 79 mpc_int32_t SampleRate; // Sample frequency 80 81 mpc_uint32_t StreamVersion; // version of bitstream 82 mpc_int32_t Max_Band; 83 mpc_uint32_t MPCHeaderPos; // AB: needed to support ID3v2 84 85 mpc_uint32_t FrameWasValid; 86 mpc_uint32_t MS_used; // MS-coding used ? 87 mpc_uint32_t TrueGaplessPresent; 88 89 mpc_uint32_t WordsRead; // counts amount of decoded dwords 90 91 // randomizer state variables 92 mpc_uint32_t __r1; 93 mpc_uint32_t __r2; 94 95 // seeking 96 mpc_uint32_t seeking_table[SEEKING_TABLE_SIZE]; 97 mpc_uint32_t seeking_pwr; // distance between 2 frames in seeking_table = 2^seeking_pwr 98 mpc_uint32_t seeking_table_frames; // last frame in seaking table 99 mpc_uint32_t seeking_window; // number of frames to look for scalefactors 100 101 mpc_int32_t SCF_Index_L [32] [3]; 102 mpc_int32_t SCF_Index_R [32] [3]; // holds scalefactor-indices 103 QuantTyp Q [32]; // holds quantized samples 104 mpc_int32_t Res_L [32]; 105 mpc_int32_t Res_R [32]; // holds the chosen quantizer for each subband 106 mpc_bool_t DSCF_Flag_L [32]; 107 mpc_bool_t DSCF_Flag_R [32]; // differential SCF used? 108 mpc_int32_t SCFI_L [32]; 109 mpc_int32_t SCFI_R [32]; // describes order of transmitted SCF 110 mpc_bool_t MS_Flag[32]; // MS used? 111 #ifdef MPC_FIXED_POINT 112 unsigned char SCF_shift[256]; 113 #endif 114 115 MPC_SAMPLE_FORMAT V_L[MPC_V_MEM + 960]; 116 MPC_SAMPLE_FORMAT V_R[MPC_V_MEM + 960]; 117 MPC_SAMPLE_FORMAT Y_L[36][32]; 118 MPC_SAMPLE_FORMAT Y_R[36][32]; 119 MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention) 120 //@} 121 122 } mpc_decoder; 123 124 #endif // _mpc_decoder_h 125