annotate SDL_sound_internal.h @ 486:859dd2ef3197

Added some seriously INCOMPLETE mixer code.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 27 Feb 2005 19:55:29 +0000
parents 137c0b00ea4c
children 2df1f5c62d38
rev   line source
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * Internal function/structure declaration. Do NOT include in your
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22 * application.
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23 *
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24 * Please see the file COPYING in the source's root directory.
4
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25 *
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26 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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27 */
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28
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29 #ifndef _INCLUDE_SDL_SOUND_INTERNAL_H_
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30 #define _INCLUDE_SDL_SOUND_INTERNAL_H_
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31
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32 #ifndef __SDL_SOUND_INTERNAL__
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33 #error Do not include this header from your applications.
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34 #endif
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35
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36 #include "SDL.h"
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37
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38 /* SDL 1.2.4 defines this, but better safe than sorry. */
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39 #if (!defined(__inline__))
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40 # define __inline__
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41 #endif
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42
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43 #if (defined DEBUG_CHATTER)
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44 #define SNDDBG(x) printf x
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45 #else
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46 #define SNDDBG(x)
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47 #endif
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48
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49 #if HAVE_ASSERT_H
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50 # include <assert.h>
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51 #endif
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52
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53 #ifdef _WIN32_WCE
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54 extern char *strrchr(const char *s, int c);
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55 # ifdef NDEBUG
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56 # define assert(x)
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57 # else
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58 # define assert(x) if(!x) { fprintf(stderr,"Assertion failed in %s, line %s.\n",__FILE__,__LINE__); fclose(stderr); fclose(stdout); exit(1); }
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59 # endif
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60 #endif
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61
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62
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63 #if (!defined assert) /* if all else fails. */
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64 # define assert(x)
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65 #endif
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66
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67
485
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68 /*
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69 * SDL itself only supports mono and stereo output, but hopefully we can
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70 * raise this value someday...there's probably a lot of assumptions in
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71 * SDL_sound that rely on it, though.
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72 */
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73 #define MAX_CHANNELS 2
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74
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75
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76 typedef struct __SOUND_DECODERFUNCTIONS__
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77 {
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78 /* This is a block of info about your decoder. See SDL_sound.h. */
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79 const Sound_DecoderInfo info;
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80
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81 /*
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82 * This is called during the Sound_Init() function. Use this to
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83 * set up any global state that your decoder needs, such as
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84 * initializing an external library, etc.
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85 *
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86 * Return non-zero if initialization is successful, zero if there's
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87 * a fatal error. If this method fails, then this decoder is
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88 * flagged as unavailable until SDL_sound() is shut down and
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89 * reinitialized, in which case this method will be tried again.
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90 *
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91 * Note that the decoders quit() method won't be called if this
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92 * method fails, so if you can't intialize, you'll have to clean
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93 * up the half-initialized state in this method.
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94 */
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95 int (*init)(void);
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96
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97 /*
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98 * This is called during the Sound_Quit() function. Use this to
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99 * clean up any global state that your decoder has used during its
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100 * lifespan.
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101 */
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102 void (*quit)(void);
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103
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104 /*
4
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105 * Returns non-zero if (sample) has a valid fileformat that this
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106 * driver can handle. Zero if this driver can NOT handle the data.
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107 *
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108 * Extension, which may be NULL, is just a hint as to the form of
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109 * data that is being passed in. Most decoders should determine if
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110 * they can handle the data by the data itself, but others, like
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111 * the raw data handler, need this hint to know if they should
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112 * accept the data in the first place.
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113 *
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114 * (sample)'s (opaque) field should be cast to a Sound_SampleInternal
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115 * pointer:
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116 *
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117 * Sound_SampleInternal *internal;
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118 * internal = (Sound_SampleInternal *) sample->opaque;
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119 *
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120 * Certain fields of sample will be filled in for the decoder before
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121 * this call, and others should be filled in by the decoder. Some
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122 * fields are offlimits, and should NOT be modified. The list:
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123 *
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124 * in Sound_SampleInternal section:
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125 * Sound_Sample *next; (offlimits)
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126 * Sound_Sample *prev; (offlimits)
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127 * SDL_RWops *rw; (can use, but do NOT close it)
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128 * const Sound_DecoderFunctions *funcs; (that's this structure)
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129 * Sound_AudioCVT sdlcvt; (offlimits)
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130 * void *buffer; (offlimits until read() method)
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131 * Uint32 buffer_size; (offlimits until read() method)
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132 * void *decoder_private; (read and write access)
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133 *
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134 * in rest of Sound_Sample:
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135 * void *opaque; (this was internal section, above)
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136 * const Sound_DecoderInfo *decoder; (read only)
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137 * Sound_AudioInfo desired; (read only, usually not needed here)
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138 * Sound_AudioInfo actual; (please fill this in)
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139 * void *buffer; (offlimits)
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140 * Uint32 buffer_size; (offlimits)
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141 * Sound_SampleFlags flags; (set appropriately)
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142 */
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143 int (*open)(Sound_Sample *sample, const char *ext);
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144
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145 /*
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146 * Clean up. SDL_sound is done with this sample, so the decoder should
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147 * clean up any resources it allocated. Anything that wasn't
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148 * explicitly allocated by the decoder should be LEFT ALONE, since
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149 * the higher-level SDL_sound layer will clean up its own mess.
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150 */
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151 void (*close)(Sound_Sample *sample);
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152
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153 /*
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154 * Get more data from (sample). The decoder should get a pointer to
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155 * the internal structure...
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156 *
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157 * Sound_SampleInternal *internal;
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158 * internal = (Sound_SampleInternal *) sample->opaque;
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159 *
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160 * ...and then start decoding. Fill in up to internal->buffer_size
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161 * bytes of decoded sound in the space pointed to by
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162 * internal->buffer. The encoded data is read in from internal->rw.
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163 * Data should be decoded in the format specified during the
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164 * decoder's open() method in the sample->actual field. The
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165 * conversion to the desired format is done at a higher level.
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166 *
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167 * The return value is the number of bytes decoded into
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168 * internal->buffer, which can be no more than internal->buffer_size,
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169 * but can be less. If it is less, you should set a state flag:
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170 *
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171 * If there's just no more data (end of file, etc), then do:
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172 * sample->flags |= SOUND_SAMPLEFLAG_EOF;
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173 *
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174 * If there's an unrecoverable error, then do:
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175 * __Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG);
4
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176 * sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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177 *
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178 * If there's more data, but you'd have to block for considerable
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179 * amounts of time to get at it, or there's a recoverable error,
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180 * then do:
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181 * __Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG);
4
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182 * sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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183 *
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184 * SDL_sound will not call your read() method for any samples with
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185 * SOUND_SAMPLEFLAG_EOF or SOUND_SAMPLEFLAG_ERROR set. The
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186 * SOUND_SAMPLEFLAG_EAGAIN flag is reset before each call to this
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187 * method.
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188 */
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189 Uint32 (*read)(Sound_Sample *sample);
223
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190
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191 /*
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192 * Reset the decoding to the beginning of the stream. Nonzero on
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193 * success, zero on failure.
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194 *
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195 * The purpose of this method is to allow for higher efficiency than
249186e31431 Sound_Rewind() support code.
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196 * an application could get by just recreating the sample externally;
249186e31431 Sound_Rewind() support code.
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197 * not only do they not have to reopen the RWops, reallocate buffers,
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198 * and potentially pass the data through several rejecting decoders,
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199 * but certain decoders will not have to recreate their existing
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200 * state (search for metadata, etc) since they already know they
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201 * have a valid audio stream with a given set of characteristics.
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202 *
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203 * The decoder is responsible for calling seek() on the associated
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204 * SDL_RWops. A failing call to seek() should be the ONLY reason that
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205 * this method should ever fail!
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206 */
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207 int (*rewind)(Sound_Sample *sample);
306
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208
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209 /*
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210 * Reposition the decoding to an arbitrary point. Nonzero on
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211 * success, zero on failure.
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212 *
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213 * The purpose of this method is to allow for higher efficiency than
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214 * an application could get by just rewinding the sample and
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Ryan C. Gordon <icculus@icculus.org>
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215 * decoding to a given point.
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216 *
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217 * The decoder is responsible for calling seek() on the associated
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218 * SDL_RWops.
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219 *
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220 * If there is an error, try to recover so that the next read will
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221 * continue as if nothing happened.
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222 */
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223 int (*seek)(Sound_Sample *sample, Uint32 ms);
4
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224 } Sound_DecoderFunctions;
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225
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226
143
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227 /* A structure to hold a set of audio conversion filters and buffers */
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228 typedef struct Sound_AudioCVT
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229 {
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230 int needed; /* Set to 1 if conversion possible */
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231 Uint16 src_format; /* Source audio format */
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232 Uint16 dst_format; /* Target audio format */
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233 double rate_incr; /* Rate conversion increment */
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234 Uint8 *buf; /* Buffer to hold entire audio data */
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235 int len; /* Length of original audio buffer */
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236 int len_cvt; /* Length of converted audio buffer */
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237 int len_mult; /* buffer must be len*len_mult big */
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238 double len_ratio; /* Given len, final size is len*len_ratio */
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239 void (*filters[20])(struct Sound_AudioCVT *cvt, Uint16 *format);
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240 int filter_index; /* Current audio conversion function */
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241 } Sound_AudioCVT;
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242
441
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243 extern SNDDECLSPEC int Sound_BuildAudioCVT(Sound_AudioCVT *cvt,
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244 Uint16 src_format, Uint8 src_channels, Uint32 src_rate,
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245 Uint16 dst_format, Uint8 dst_channels, Uint32 dst_rate,
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246 Uint32 dst_size);
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247
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248 extern SNDDECLSPEC int Sound_ConvertAudio(Sound_AudioCVT *cvt);
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249
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250
485
137c0b00ea4c Added Sound_NewSampleFromMem(), and implementation of RWops pooling.
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251 typedef void (*MixFunc)(float *dst, void *src, Uint32 frames, float *gains);
441
5b00e43ec23c Patches to make SDL_sound more Visual C happy.
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252
4
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253 typedef struct __SOUND_SAMPLEINTERNAL__
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254 {
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255 Sound_Sample *next;
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256 Sound_Sample *prev;
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257 SDL_RWops *rw;
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258 const Sound_DecoderFunctions *funcs;
143
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259 Sound_AudioCVT sdlcvt;
4
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260 void *buffer;
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261 Uint32 buffer_size;
12
2888101dcf98 Added _D(()) macro, decoder_private field, and changed read() method from
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diff changeset
262 void *decoder_private;
477
3e705c9180e5 Fixed binary compatibility, added Sound_GetDuration().
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
263 Sint32 total_time;
485
137c0b00ea4c Added Sound_NewSampleFromMem(), and implementation of RWops pooling.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
264 Uint32 mix_position;
137c0b00ea4c Added Sound_NewSampleFromMem(), and implementation of RWops pooling.
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265 MixFunc mix;
4
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266 } Sound_SampleInternal;
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267
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268
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269 /* error messages... */
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270 #define ERR_IS_INITIALIZED "Already initialized"
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271 #define ERR_NOT_INITIALIZED "Not initialized"
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272 #define ERR_INVALID_ARGUMENT "Invalid argument"
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273 #define ERR_OUT_OF_MEMORY "Out of memory"
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Ryan C. Gordon <icculus@icculus.org>
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274 #define ERR_NOT_SUPPORTED "Operation not supported"
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Ryan C. Gordon <icculus@icculus.org>
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275 #define ERR_UNSUPPORTED_FORMAT "Sound format unsupported"
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276 #define ERR_NOT_A_HANDLE "Not a file handle"
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277 #define ERR_NO_SUCH_FILE "No such file"
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Ryan C. Gordon <icculus@icculus.org>
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278 #define ERR_PAST_EOF "Past end of file"
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Ryan C. Gordon <icculus@icculus.org>
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279 #define ERR_IO_ERROR "I/O error"
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Ryan C. Gordon <icculus@icculus.org>
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280 #define ERR_COMPRESSION "(De)compression error"
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281 #define ERR_PREV_ERROR "Previous decoding already caused an error"
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282 #define ERR_PREV_EOF "Previous decoding already triggered EOF"
306
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283 #define ERR_CANNOT_SEEK "Sample is not seekable"
4
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284
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Ryan C. Gordon <icculus@icculus.org>
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285 /*
341cea3e13c6 Initial add.
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286 * Call this to set the message returned by Sound_GetError().
341cea3e13c6 Initial add.
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287 * Please only use the ERR_* constants above, or add new constants to the
341cea3e13c6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
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288 * above group, but I want these all in one place.
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Ryan C. Gordon <icculus@icculus.org>
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289 *
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290 * Calling this with a NULL argument is a safe no-op.
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291 */
306
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292 void __Sound_SetError(const char *err);
c97be6e1bd27 Added framework for Sound_Seek() support.
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293
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
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294 /*
c97be6e1bd27 Added framework for Sound_Seek() support.
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295 * Call this to convert milliseconds to an actual byte position, based on
c97be6e1bd27 Added framework for Sound_Seek() support.
Ryan C. Gordon <icculus@icculus.org>
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296 * audio data characteristics.
c97be6e1bd27 Added framework for Sound_Seek() support.
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297 */
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diff changeset
298 Uint32 __Sound_convertMsToBytePos(Sound_AudioInfo *info, Uint32 ms);
4
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299
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Ryan C. Gordon <icculus@icculus.org>
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300 /*
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301 * Use this if you need a cross-platform stricmp().
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302 */
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303 int __Sound_strcasecmp(const char *x, const char *y);
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304
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305
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306 /* These get used all over for lessening code clutter. */
306
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307 #define BAIL_MACRO(e, r) { __Sound_SetError(e); return r; }
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308 #define BAIL_IF_MACRO(c, e, r) if (c) { __Sound_SetError(e); return r; }
4
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309
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310
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311
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312
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313 /*--------------------------------------------------------------------------*/
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314 /*--------------------------------------------------------------------------*/
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315 /*------------ ----------------*/
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316 /*------------ You MUST implement the following functions ----------------*/
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317 /*------------ if porting to a new platform. ----------------*/
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318 /*------------ (see platform/unix.c for an example) ----------------*/
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319 /*------------ ----------------*/
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320 /*--------------------------------------------------------------------------*/
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321 /*--------------------------------------------------------------------------*/
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322
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323
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324 /* (None, right now.) */
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325
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326
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327 #ifdef __cplusplus
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328 extern "C" {
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329 #endif
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330
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331 #endif /* defined _INCLUDE_SDL_SOUND_INTERNAL_H_ */
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332
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333 /* end of SDL_sound_internal.h ... */
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334