111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
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/*
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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 internal.h
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/// Definitions and structures used only internally by the libmpcdec.
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#ifndef _MPCDEC_INTERNAL_H_
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#define _MPCDEC_INTERNAL_H_
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#ifdef WIN32
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#pragma once
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <mpcdec/mpcdec.h>
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/// Big/little endian 32 bit byte swapping routine.
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static mpc_inline
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mpc_uint32_t mpc_swap32(mpc_uint32_t val) {
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return (((val & 0xFF000000) >> 24) | ((val & 0x00FF0000) >> 8)
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| ((val & 0x0000FF00) << 8) | ((val & 0x000000FF) << 24));
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}
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typedef struct mpc_block_t {
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char key[2]; // block key
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mpc_uint64_t size; // block size minus the block header size
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} mpc_block;
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#define MAX_FRAME_SIZE 4352
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#define DEMUX_BUFFER_SIZE (65536 - MAX_FRAME_SIZE) // need some space as sand box
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struct mpc_demux_t {
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mpc_reader * r;
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mpc_decoder * d;
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mpc_streaminfo si;
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// buffer
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mpc_uint8_t buffer[DEMUX_BUFFER_SIZE + MAX_FRAME_SIZE];
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mpc_size_t bytes_total;
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mpc_bits_reader bits_reader;
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mpc_int32_t block_bits; /// bits remaining in current audio block
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mpc_uint_t block_frames; /// frames remaining in current audio block
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// seeking
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mpc_seek_t * seek_table;
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mpc_uint_t seek_pwr; /// distance between 2 frames in seek_table = 2^seek_pwr
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mpc_uint32_t seek_table_size; /// used size in seek_table
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// chapters
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mpc_seek_t chap_pos; /// supposed position of the first chapter block
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mpc_int_t chap_nb; /// number of chapters (-1 if unknown, 0 if no chapter)
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mpc_chap_info * chap; /// chapters position and tag
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};
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/**
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* checks if a block key is valid
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* @param key the two caracters key to check
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* @return MPC_STATUS_FAIL if the key is invalid, MPC_STATUS_OK else
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*/
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static mpc_inline mpc_status mpc_check_key(char * key)
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{
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if (key[0] < 65 || key[0] > 90 || key[1] < 65 || key[1] > 90)
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return MPC_STATUS_FAIL;
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return MPC_STATUS_OK;
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}
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/// helper functions used by multiple files
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mpc_uint32_t mpc_random_int(mpc_decoder *d); // in synth_filter.c
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void mpc_decoder_init_quant(mpc_decoder *d, double scale_factor);
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void mpc_decoder_synthese_filter_float(mpc_decoder *d, MPC_SAMPLE_FORMAT* OutData, mpc_int_t channels);
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#define MPC_IS_FAILURE(X) ((int)(X) < (int)MPC_STATUS_OK)
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#define MPC_AUTO_FAIL(X) { mpc_status s = (X); if (MPC_IS_FAILURE(s)) return s; }
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#ifdef __cplusplus
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}
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#endif
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#endif
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