1d28fe7d79
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17584 a1c6a512-1295-4272-9138-f99709370657
129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*
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Copyright (c) 2005, The Musepack Development Team
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of the The Musepack Development Team nor the
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names of its contributors may be used to endorse or promote
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products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/// \file decoder.h
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#ifndef _mpcdec_decoder_h_
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#define _mpcdec_decoder_h_
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#include "huffman.h"
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#include "math.h"
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#include "musepack.h"
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#include "reader.h"
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#include "streaminfo.h"
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//#define MPC_SUPPORT_SV456
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#define SCF_HACK
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enum {
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MPC_V_MEM = 2304,
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MPC_DECODER_MEMSIZE = 16384, // overall buffer size (words)
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MPC_SEEK_BUFFER_SIZE = 65536, // seek buffer size (words)
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};
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typedef struct {
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mpc_int16_t L [36];
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mpc_int16_t R [36];
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} QuantTyp;
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typedef struct mpc_decoder_t {
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mpc_reader *r;
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/// @name internal state variables
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//@{
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mpc_uint32_t next;
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mpc_uint32_t dword; /// currently decoded 32bit-word
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mpc_uint32_t pos; /// bit-position within dword
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mpc_uint32_t *Speicher; /// read-buffer
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mpc_uint32_t Zaehler; /// actual index within read-buffer
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mpc_uint32_t Ring;
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mpc_uint32_t samples_to_skip;
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mpc_uint32_t last_block_samples;
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mpc_uint32_t FwdJumpInfo;
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mpc_uint32_t ActDecodePos;
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mpc_uint32_t DecodedFrames;
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mpc_uint32_t OverallFrames;
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mpc_uint32_t MaxDecodedFrames; // Maximum frames decoded (indicates usable seek table entries)
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mpc_uint16_t SeekTableIndex;
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mpc_uint32_t SeekTableCounter;
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mpc_int32_t SampleRate; // Sample frequency
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mpc_uint32_t StreamVersion; // version of bitstream
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mpc_int32_t Max_Band;
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mpc_uint32_t MPCHeaderPos; // AB: needed to support ID3v2
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mpc_uint32_t FrameWasValid;
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mpc_uint32_t MS_used; // MS-coding used ?
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mpc_uint32_t TrueGaplessPresent;
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mpc_uint32_t WordsRead; // counts amount of decoded dwords
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// randomizer state variables
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mpc_uint32_t __r1;
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mpc_uint32_t __r2;
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mpc_int8_t SCF_Index_L [32] [3];
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mpc_int8_t SCF_Index_R [32] [3]; // holds scalefactor-indices
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QuantTyp Q [32]; // holds quantized samples
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mpc_int8_t Res_L [32];
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mpc_int8_t Res_R [32]; // holds the chosen quantizer for each subband
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#ifdef MPC_SUPPORT_SV456
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mpc_bool_t DSCF_Flag_L [32];
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mpc_bool_t DSCF_Flag_R [32]; // differential SCF used?
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#endif
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mpc_int8_t SCFI_L [32];
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mpc_int8_t SCFI_R [32]; // describes order of transmitted SCF
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mpc_bool_t MS_Flag[32]; // MS used?
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mpc_uint32_t* SeekTable;
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mpc_uint8_t SeekTable_Step;
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#ifdef MPC_FIXED_POINT
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mpc_uint8_t SCF_shift[256];
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#endif
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MPC_SAMPLE_FORMAT V_L[MPC_V_MEM + 960];
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MPC_SAMPLE_FORMAT V_R[MPC_V_MEM + 960];
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MPC_SAMPLE_FORMAT (*Y_L)[32];
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MPC_SAMPLE_FORMAT (*Y_R)[32];
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MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
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//@}
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} mpc_decoder;
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#endif // _mpc_decoder_h
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