apps/codecs/libmusepack/mpcdec.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 mpcdec.h
  35 /// Top level include file for libmpcdec.
  36 #ifndef _MPCDEC_H_
  37 #define _MPCDEC_H_
  38 #ifdef WIN32
  39 #pragma once
  40 #endif
  41
  42 #include "reader.h"
  43 #include "streaminfo.h"
  44 #include "config.h"
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49
  50 #if   (CONFIG_CPU == MCF5250) || defined(CPU_S5L870X)
  51 /* Enough IRAM but performance suffers with ICODE_ATTR. */
  52 #define IBSS_ATTR_MPC_LARGE_IRAM   IBSS_ATTR
  53 #define ICODE_ATTR_MPC_LARGE_IRAM
  54 #define ICONST_ATTR_MPC_LARGE_IRAM ICONST_ATTR
  55
  56 #elif (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024)
  57 /* Enough IRAM to move additional data and code to it. */
  58 #define IBSS_ATTR_MPC_LARGE_IRAM   IBSS_ATTR
  59 #define ICODE_ATTR_MPC_LARGE_IRAM  ICODE_ATTR
  60 #define ICONST_ATTR_MPC_LARGE_IRAM ICONST_ATTR
  61
  62 #else
  63 /* Not enough IRAM available. */
  64 #define IBSS_ATTR_MPC_LARGE_IRAM
  65 #define ICODE_ATTR_MPC_LARGE_IRAM
  66 #define ICONST_ATTR_MPC_LARGE_IRAM
  67 #endif
  68
  69 enum {
  70     MPC_FRAME_LENGTH          = (36 * 32),              ///< Samples per mpc frame
  71     MPC_DECODER_BUFFER_LENGTH = (MPC_FRAME_LENGTH * 2), ///< Required buffer size for decoder (2 channels)
  72     MPC_DECODER_SYNTH_DELAY   = 481
  73 };
  74
  75 typedef struct mpc_decoder_t mpc_decoder;
  76 typedef struct mpc_demux_t mpc_demux;
  77
  78 typedef struct mpc_bits_reader_t {
  79     unsigned char * buff;       /// pointer on current byte
  80     unsigned int count;         /// unread bits in current byte
  81     mpc_uint8_t *buffered_addr; /// used for rockbox Coldfire optimization only
  82     mpc_uint32_t buffered_code; /// used for rockbox Coldfire optimization only
  83 } mpc_bits_reader;
  84
  85 typedef struct mpc_frame_info_t {
  86     mpc_uint32_t samples;       /// number of samples in the frame (counting once for multiple channels)
  87     mpc_int32_t bits;           /// number of bits consumed by this frame (-1) if end of stream
  88     MPC_SAMPLE_FORMAT * buffer; /// frame samples buffer (size = samples * channels * sizeof(MPC_SAMPLE_FORMAT))
  89     mpc_bool_t is_key_frame;    /// 1 if this frame is a key frame (first in block) 0 else. Set by the demuxer.
  90 } mpc_frame_info;
  91
  92 typedef struct mpc_chap_info_t {
  93     mpc_uint64_t sample;    /// sample where the chapter starts
  94     mpc_uint16_t gain;      /// replaygain chapter value
  95     mpc_uint16_t peak;      /// peak chapter loudness level
  96     mpc_uint_t tag_size;    /// size of the tag element (0 if no tag is present for this chapter)
  97     char * tag;             /// pointer to an APEv2 tag without the preamble
  98 } mpc_chap_info;
  99
 100 /// Initializes mpc decoder with the supplied stream info parameters.
 101 /// \param si streaminfo structure indicating format of source stream
 102 /// \return pointer on the initialized decoder structure if successful, 0 if not
 103 MPC_API mpc_decoder * mpc_decoder_init(mpc_streaminfo *si);
 104
 105 /// Releases input mpc decoder
 106 MPC_API void mpc_decoder_exit(mpc_decoder *p_dec);
 107
 108 /**
 109  * Sets decoder sample scaling factor.  All decoded samples will be multiplied
 110  * by this factor. Useful for applying replay gain.
 111  * @param scale_factor multiplicative scaling factor
 112  */
 113 MPC_API void mpc_decoder_scale_output(mpc_decoder *p_dec, double scale_factor);
 114
 115 MPC_API void mpc_decoder_decode_frame(mpc_decoder * d, mpc_bits_reader * r, mpc_frame_info * i);
 116
 117 // This is the gain reference used in old replaygain
 118 #define MPC_OLD_GAIN_REF 64.82
 119
 120 /**
 121  * init demuxer
 122  * @param p_reader initialized mpc_reader pointer
 123  * @return an initialized mpc_demux pointer
 124  */
 125 MPC_API mpc_demux * mpc_demux_init(mpc_reader * p_reader);
 126 /// free demuxer
 127 MPC_API void mpc_demux_exit(mpc_demux * d);
 128 /**
 129  * Calls mpc_decoder_scale_output to set the scaling factor according to the
 130  * replay gain stream information and the supplied ouput level
 131  * @param d pointer to a musepack demuxer
 132  * @param level the desired ouput level (in db). Must be MPC_OLD_GAIN_REF (64.82 db) if you want to get the old replaygain behavior
 133  * @param use_gain set it to MPC_TRUE if you want to set the scaling factor according to the stream gain
 134  * @param use_title MPC_TRUE : uses the title gain, MPC_FALSE : uses the album gain
 135  * @param clip_prevention MPC_TRUE : uses cliping prevention
 136  */
 137 /* rockbox: not used
 138 MPC_API void mpc_set_replay_level(mpc_demux * d, float level, mpc_bool_t use_gain,
 139                           mpc_bool_t use_title, mpc_bool_t clip_prevention);
 140 */
 141 /// decode frame
 142 MPC_API mpc_status mpc_demux_decode(mpc_demux * d, mpc_frame_info * i);
 143 /// get streaminfo
 144 MPC_API void mpc_demux_get_info(mpc_demux * d, mpc_streaminfo * i);
 145 /// seeks to a given sample
 146 MPC_API mpc_status mpc_demux_seek_sample(mpc_demux * d, mpc_uint64_t destsample);
 147 /// seeks to a given second
 148 MPC_API mpc_status mpc_demux_seek_second(mpc_demux * d, double seconds);
 149
 150 /// \return the current position in the stream (in bits) from the beginning of the file
 151 MPC_API mpc_seek_t mpc_demux_pos(mpc_demux * d);
 152
 153 /// chapters : only for sv8 streams
 154 /**
 155  * Gets the number of chapters in the stream
 156  * @param d pointer to a musepack demuxer
 157  * @return the number of chapters found in the stream
 158  */
 159 /* rockbox: not used
 160 MPC_API mpc_int_t mpc_demux_chap_nb(mpc_demux * d);
 161 */
 162 /**
 163  * Gets datas associated to a given chapter
 164  * The chapter tag is an APEv2 tag without the preamble
 165  * @param d pointer to a musepack demuxer
 166  * @param chap_nb chapter number you want datas (from 0 to mpc_demux_chap_nb(d) - 1)
 167  * @return the chapter information structure
 168  */
 169 /* rockbox: not used
 170 MPC_API mpc_chap_info const * mpc_demux_chap(mpc_demux * d, int chap_nb);
 171 */
 172 #ifdef __cplusplus
 173 }
 174 #endif
 175 #endif