1 /* 2 Copyright (c) 2005-2009, 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 /// \file decoder.h 35 #ifndef _MPCDEC_DECODER_H_ 36 #define _MPCDEC_DECODER_H_ 37 #ifdef WIN32 38 #pragma once 39 #endif 40 41 #include "reader.h" 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 #define SEEKING_TABLE_SIZE 256u 48 // set it to SLOW_SEEKING_WINDOW to not use fast seeking 49 #define FAST_SEEKING_WINDOW 32 50 // set it to FAST_SEEKING_WINDOW to only use fast seeking 51 #define SLOW_SEEKING_WINDOW 0x80000000 52 53 enum { 54 MPC_V_MEM = 2304, 55 MPC_DECODER_MEMSIZE = 16384, // overall buffer size 56 }; 57 58 struct mpc_decoder_t { 59 /// @name internal state variables 60 //@{ 61 mpc_uint32_t stream_version; ///< Streamversion of stream 62 mpc_int32_t max_band; ///< Maximum band-index used in stream (0...31) 63 mpc_uint32_t ms; ///< Mid/side stereo (0: off, 1: on) 64 mpc_uint32_t channels; ///< Number of channels in stream 65 66 mpc_uint64_t samples; ///< Number of samples in stream 67 68 mpc_uint64_t decoded_samples; ///< Number of samples decoded from file begining 69 mpc_uint32_t samples_to_skip; ///< Number samples to skip (used for seeking) 70 mpc_int32_t last_max_band; ///< number of bands used in the last frame 71 72 // randomizer state variables 73 mpc_uint32_t __r1; 74 mpc_uint32_t __r2; 75 76 mpc_int32_t SCF_Index_L [32] [3]; 77 mpc_int32_t SCF_Index_R [32] [3]; // holds scalefactor-indices 78 mpc_quantizer Q [32]; // holds quantized samples 79 mpc_int32_t Res_L [32]; 80 mpc_int32_t Res_R [32]; // holds the chosen quantizer for each subband 81 mpc_bool_t DSCF_Flag_L [32]; 82 mpc_bool_t DSCF_Flag_R [32]; // differential SCF used? 83 mpc_int32_t SCFI_L [32]; 84 mpc_int32_t SCFI_R [32]; // describes order of transmitted SCF 85 mpc_bool_t MS_Flag[32]; // MS used? 86 #ifdef MPC_FIXED_POINT 87 mpc_uint8_t SCF_shift[256]; 88 #endif 89 90 MPC_SAMPLE_FORMAT V_L[MPC_V_MEM + 960]; 91 MPC_SAMPLE_FORMAT V_R[MPC_V_MEM + 960]; 92 MPC_SAMPLE_FORMAT Y_L[36][32]; 93 MPC_SAMPLE_FORMAT Y_R[36][32]; 94 MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention) 95 //@} 96 }; 97 98 #ifdef __cplusplus 99 } 100 #endif 101 #endif 102