101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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Copyright (c) 2005-2009, 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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#ifdef WIN32
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#pragma once
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#endif
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#include <mpc/reader.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SEEKING_TABLE_SIZE 256u
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// set it to SLOW_SEEKING_WINDOW to not use fast seeking
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#define FAST_SEEKING_WINDOW 32
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// set it to FAST_SEEKING_WINDOW to only use fast seeking
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#define SLOW_SEEKING_WINDOW 0x80000000
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enum {
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MPC_V_MEM = 2304,
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MPC_DECODER_MEMSIZE = 16384, // overall buffer size
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};
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struct mpc_decoder_t {
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/// @name internal state variables
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//@{
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mpc_uint32_t stream_version; ///< Streamversion of stream
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mpc_int32_t max_band; ///< Maximum band-index used in stream (0...31)
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mpc_uint32_t ms; ///< Mid/side stereo (0: off, 1: on)
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mpc_uint32_t channels; ///< Number of channels in stream
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mpc_uint64_t samples; ///< Number of samples in stream
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mpc_uint64_t decoded_samples; ///< Number of samples decoded from file begining
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mpc_uint32_t samples_to_skip; ///< Number samples to skip (used for seeking)
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mpc_int32_t last_max_band; ///< number of bands used in the last frame
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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_int32_t SCF_Index_L [32] [3];
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mpc_int32_t SCF_Index_R [32] [3]; // holds scalefactor-indices
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mpc_quantizer Q [32]; // holds quantized samples
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mpc_int32_t Res_L [32];
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mpc_int32_t Res_R [32]; // holds the chosen quantizer for each subband
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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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mpc_int32_t SCFI_L [32];
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mpc_int32_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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#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[36][32];
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MPC_SAMPLE_FORMAT Y_R[36][32];
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MPC_SAMPLE_FORMAT SCF[256]; ///< holds adapted scalefactors (for clipping prevention)
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//@}
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};
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#ifdef __cplusplus
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}
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#endif
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#endif
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