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/*
Copyright (c) 2005, The Musepack Development Team
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of the The Musepack Development Team nor the
names of its contributors may be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/// \file decoder.h
#ifndef _mpcdec_decoder_h_
#define _mpcdec_decoder_h_
#include "huffman.h"
#include "math.h"
#include "musepack.h"
#include "reader.h"
#include "streaminfo.h"
//#define MPC_SUPPORT_SV456
#define SCF_HACK
enum {
MPC_V_MEM = 2304,
MPC_DECODER_MEMSIZE = 16384, // overall buffer size
};
typedef struct {
mpc_int16_t L [36];
mpc_int16_t R [36];
} QuantTyp;
typedef struct mpc_decoder_t {
mpc_reader *r;
/// @name internal state variables
//@{
mpc_uint32_t next;
mpc_uint32_t dword; /// currently decoded 32bit-word
mpc_uint32_t pos; /// bit-position within dword
mpc_uint32_t *Speicher; /// read-buffer
mpc_uint32_t Zaehler; /// actual index within read-buffer
mpc_uint32_t Ring;
mpc_uint32_t samples_to_skip;
mpc_uint32_t last_block_samples;
mpc_uint32_t FwdJumpInfo;
mpc_uint32_t ActDecodePos;
mpc_uint32_t DecodedFrames;
mpc_uint32_t OverallFrames;
mpc_uint32_t MaxDecodedFrames; // Maximum frames decoded (indicates usable seek table entries)
mpc_uint16_t SeekTableIndex;
mpc_uint32_t SeekTableCounter;
mpc_int32_t SampleRate; // Sample frequency
mpc_uint32_t StreamVersion; // version of bitstream
mpc_int32_t Max_Band;
mpc_uint32_t MPCHeaderPos; // AB: needed to support ID3v2
mpc_uint32_t FrameWasValid;
mpc_uint32_t MS_used; // MS-coding used ?
mpc_uint32_t TrueGaplessPresent;
mpc_uint32_t WordsRead; // counts amount of decoded dwords
// randomizer state variables
mpc_uint32_t __r1;
mpc_uint32_t __r2;
mpc_int8_t SCF_Index_L [32] [3];
mpc_int8_t SCF_Index_R [32] [3]; // holds scalefactor-indices
QuantTyp Q [32]; // holds quantized samples
mpc_int8_t Res_L [32];
mpc_int8_t Res_R [32]; // holds the chosen quantizer for each subband
#ifdef MPC_SUPPORT_SV456
mpc_bool_t DSCF_Flag_L [32];
mpc_bool_t DSCF_Flag_R [32]; // differential SCF used?
#endif
mpc_int8_t SCFI_L [32];
mpc_int8_t SCFI_R [32]; // describes order of transmitted SCF
mpc_bool_t MS_Flag[32]; // MS used?
mpc_uint32_t* SeekTable;
mpc_uint8_t SeekTable_Step;
#ifdef MPC_FIXED_POINT
mpc_uint8_t 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)[32];
MPC_SAMPLE_FORMAT (*Y_R)[32];
MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
//@}
} mpc_decoder;
#endif // _mpc_decoder_h
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