125 lines
4.5 KiB
C
125 lines
4.5 KiB
C
/*
|
|
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 "mpcdec.h"
|
|
#include "reader.h"
|
|
#include "streaminfo.h"
|
|
|
|
#define MPC_SUPPORT_SV456
|
|
|
|
#define SEEKING_TABLE_SIZE 256u
|
|
// set it to SLOW_SEEKING_WINDOW to not use fast seeking
|
|
#define FAST_SEEKING_WINDOW 32
|
|
// set it to FAST_SEEKING_WINDOW to only use fast seeking
|
|
#define SLOW_SEEKING_WINDOW 0x80000000
|
|
|
|
enum {
|
|
MPC_V_MEM = 2304,
|
|
MPC_DECODER_MEMSIZE = 16384, // overall buffer size
|
|
};
|
|
|
|
typedef struct {
|
|
mpc_int32_t L [36];
|
|
mpc_int32_t R [36];
|
|
} QuantTyp;
|
|
|
|
typedef struct mpc_decoder_t {
|
|
mpc_reader *r;
|
|
|
|
/// @name internal state variables
|
|
//@{
|
|
|
|
mpc_uint32_t dword; /// currently decoded 32bit-word
|
|
mpc_uint32_t pos; /// bit-position within dword
|
|
mpc_uint32_t Speicher[MPC_DECODER_MEMSIZE]; /// read-buffer
|
|
mpc_uint32_t Zaehler; /// actual index within read-buffer
|
|
|
|
mpc_uint32_t samples_to_skip;
|
|
|
|
mpc_uint32_t DecodedFrames;
|
|
mpc_uint32_t OverallFrames;
|
|
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;
|
|
|
|
// seeking
|
|
mpc_uint32_t seeking_table[SEEKING_TABLE_SIZE];
|
|
mpc_uint32_t seeking_pwr; // distance between 2 frames in seeking_table = 2^seeking_pwr
|
|
mpc_uint32_t seeking_table_frames; // last frame in seaking table
|
|
mpc_uint32_t seeking_window; // number of frames to look for scalefactors
|
|
|
|
mpc_int32_t SCF_Index_L [32] [3];
|
|
mpc_int32_t SCF_Index_R [32] [3]; // holds scalefactor-indices
|
|
QuantTyp Q [32]; // holds quantized samples
|
|
mpc_int32_t Res_L [32];
|
|
mpc_int32_t Res_R [32]; // holds the chosen quantizer for each subband
|
|
mpc_bool_t DSCF_Flag_L [32];
|
|
mpc_bool_t DSCF_Flag_R [32]; // differential SCF used?
|
|
mpc_int32_t SCFI_L [32];
|
|
mpc_int32_t SCFI_R [32]; // describes order of transmitted SCF
|
|
mpc_bool_t MS_Flag[32]; // MS used?
|
|
#ifdef MPC_FIXED_POINT
|
|
unsigned char 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[36][32];
|
|
MPC_SAMPLE_FORMAT Y_R[36][32];
|
|
MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
|
|
//@}
|
|
|
|
} mpc_decoder;
|
|
|
|
#endif // _mpc_decoder_h
|