apps/codecs/libmusepack/internal.h

   1 /*
   2   Copyright (c) 2005-2009, The Musepack Development Team
   3   All rights reserved.
   4
   5   Redistribution and use in source and binary forms, with or without
   6   modification, are permitted provided that the following conditions are
   7   met:
   8
   9   * Redistributions of source code must retain the above copyright
  10   notice, this list of conditions and the following disclaimer.
  11
  12   * Redistributions in binary form must reproduce the above
  13   copyright notice, this list of conditions and the following
  14   disclaimer in the documentation and/or other materials provided
  15   with the distribution.
  16
  17   * Neither the name of the The Musepack Development Team nor the
  18   names of its contributors may be used to endorse or promote
  19   products derived from this software without specific prior
  20   written permission.
  21
  22   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  24   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  25   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  26   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  27   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  28   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  32   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33 */
  34 /// \file internal.h
  35 /// Definitions and structures used only internally by the libmpcdec.
  36 #ifndef _MPCDEC_INTERNAL_H_
  37 #define _MPCDEC_INTERNAL_H_
  38 #ifdef WIN32
  39 #pragma once
  40 #endif
  41 #ifdef __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 #include "mpcdec.h"
  46
  47 /* rockbox: not used, rockbox's swap32 is used now.
  48 /// Big/little endian 32 bit byte swapping routine.
  49 static mpc_inline
  50 mpc_uint32_t mpc_swap32(mpc_uint32_t val) {
  51     return (((val & 0xFF000000) >> 24) | ((val & 0x00FF0000) >> 8)
  52           | ((val & 0x0000FF00) <<  8) | ((val & 0x000000FF) << 24));
  53 }
  54 */
  55 typedef struct mpc_block_t {
  56     char key[2];    // block key
  57     mpc_uint64_t size;  // block size minus the block header size
  58 } mpc_block;
  59
  60 #define MAX_FRAME_SIZE 4352
  61 #define DEMUX_BUFFER_SIZE (65536 - MAX_FRAME_SIZE) // need some space as sand box
  62
  63 struct mpc_demux_t {
  64     mpc_reader * r;
  65     mpc_decoder * d;
  66     mpc_streaminfo si;
  67
  68     // buffer
  69     mpc_uint8_t *buffer;
  70     mpc_size_t bytes_total;
  71     mpc_bits_reader bits_reader;
  72     mpc_int32_t block_bits; /// bits remaining in current audio block
  73     mpc_uint_t block_frames; /// frames remaining in current audio block
  74
  75     // seeking
  76     mpc_seek_t * seek_table;
  77     mpc_uint_t seek_pwr; /// distance between 2 frames in seek_table = 2^seek_pwr
  78     mpc_uint32_t seek_table_size; /// used size in seek_table
  79
  80     // chapters
  81 /* rockbox: not used
  82     mpc_seek_t chap_pos; /// supposed position of the first chapter block
  83     mpc_int_t chap_nb; /// number of chapters (-1 if unknown, 0 if no chapter)
  84     mpc_chap_info * chap; /// chapters position and tag
  85 */
  86 };
  87
  88 /**
  89  * checks if a block key is valid
  90  * @param key the two caracters key to check
  91  * @return MPC_STATUS_INVALIDSV if the key is invalid, MPC_STATUS_OK else
  92  */
  93 static mpc_inline mpc_status mpc_check_key(char * key)
  94 {
  95     if (key[0] < 65 || key[0] > 90 || key[1] < 65 || key[1] > 90)
  96         return MPC_STATUS_INVALIDSV;
  97     return MPC_STATUS_OK;
  98 }
  99
 100 /// helper functions used by multiple files
 101 mpc_uint32_t mpc_random_int(mpc_decoder *d); // in synth_filter.c
 102 void mpc_decoder_init_quant(mpc_decoder *d, double scale_factor);
 103 void mpc_decoder_synthese_filter_float(mpc_decoder *d, MPC_SAMPLE_FORMAT* OutData, mpc_int_t channels);
 104 unsigned long mpc_crc32(unsigned char *buf, int len);
 105
 106 // streaminfo.c
 107 mpc_status streaminfo_read_header_sv8(mpc_streaminfo* si,
 108                                       const mpc_bits_reader * r_in,
 109                                       mpc_size_t block_size);
 110 mpc_status streaminfo_read_header_sv7(mpc_streaminfo* si, mpc_bits_reader * r_in);
 111 void  streaminfo_encoder_info(mpc_streaminfo* si, const mpc_bits_reader * r_in);
 112 void  streaminfo_gain(mpc_streaminfo* si, const mpc_bits_reader * r_in);
 113
 114 // mpc_decoder.c
 115 void mpc_decoder_reset_scf(mpc_decoder * d, int value);
 116
 117 #ifdef __cplusplus
 118 }
 119 #endif
 120 #endif