Mercurial > SDL_sound_CoreAudio
annotate SDL_sound.h @ 305:c345a40a8a99
VERY preliminary work on Sound_Seek() API.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 21 Apr 2002 17:48:11 +0000 |
| parents | c54eae85f5f1 |
| children | 2740fad98dfe |
| rev | line source |
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| 0 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /** | |
|
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21 * @overview |
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22 * |
| 0 | 23 * The basic gist of SDL_sound is that you use an SDL_RWops to get sound data |
| 24 * into this library, and SDL_sound will take that data, in one of several | |
| 25 * popular formats, and decode it into raw waveform data in the format of | |
| 26 * your choice. This gives you a nice abstraction for getting sound into your | |
| 27 * game or application; just feed it to SDL_sound, and it will handle | |
| 28 * decoding and converting, so you can just pass it to your SDL audio | |
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29 * callback (or whatever). Since it gets data from an SDL_RWops, you can get |
| 0 | 30 * the initial sound data from any number of sources: file, memory buffer, |
| 31 * network connection, etc. | |
| 32 * | |
| 33 * As the name implies, this library depends on SDL: Simple Directmedia Layer, | |
| 34 * which is a powerful, free, and cross-platform multimedia library. It can | |
| 35 * be found at http://www.libsdl.org/ | |
| 36 * | |
| 37 * Support is in place or planned for the following sound formats: | |
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38 * - .WAV (Microsoft WAVfile RIFF data, internal.) |
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39 * - .VOC (Creative Labs' Voice format, internal.) |
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40 * - .MP3 (MPEG-1 Layer 3 support, via the SMPEG and mpglib libraries.) |
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41 * - .MID (MIDI music converted to Waveform data, internal.) |
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42 * - .MOD (MOD files, via MikMod and ModPlug.) |
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43 * - .OGG (Ogg files, via Ogg Vorbis libraries.) |
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44 * - .SHN (Shorten files, internal.) |
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45 * - .RAW (Raw sound data in any format, internal.) |
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46 * - .AU (Sun's Audio format, internal.) |
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47 * - .AIFF (Audio Interchange format, internal.) |
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48 * - .FLAC (Lossless audio compression, via libFLAC.) |
| 0 | 49 * |
| 50 * (...and more to come...) | |
| 51 * | |
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52 * Please see the file COPYING in the source's root directory. |
| 0 | 53 * |
| 54 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 55 */ | |
| 56 | |
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57 #ifndef _INCLUDE_SDL_SOUND_H_ |
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58 #define _INCLUDE_SDL_SOUND_H_ |
| 0 | 59 |
| 60 #include "SDL.h" | |
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61 #include "SDL_endian.h" |
| 0 | 62 |
| 63 #ifdef __cplusplus | |
| 64 extern "C" { | |
| 65 #endif | |
| 66 | |
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67 #ifdef SDL_SOUND_DLL_EXPORTS |
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68 # undef DECLSPEC |
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69 # define DECLSPEC __declspec(dllexport) |
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70 #endif |
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71 |
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72 |
| 29 | 73 #define SOUND_VER_MAJOR 0 |
| 74 #define SOUND_VER_MINOR 1 | |
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75 #define SOUND_VER_PATCH 5 |
| 29 | 76 |
| 77 | |
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78 /** |
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79 * These are flags that are used in a Sound_Sample to show various states. |
| 0 | 80 * |
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81 * To use: "if (sample->flags & SOUND_SAMPLEFLAG_ERROR) { dosomething(); }" |
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82 * |
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83 * @param SOUND_SAMPLEFLAG_NONE null flag. |
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84 * @param SOUND_SAMPLEFLAG_CANSEEK sample can seek to arbitrary points. |
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85 * @param SOUND_SAMPLEFLAG_EOF end of input stream. |
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86 * @param SOUND_SAMPLEFLAG_ERROR unrecoverable error. |
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87 * @param SOUND_SAMPLEFLAG_EAGAIN function would block, or temp error. |
| 0 | 88 */ |
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89 typedef enum __SOUND_SAMPLEFLAGS__ |
| 0 | 90 { |
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91 SOUND_SAMPLEFLAG_NONE = 0, |
| 0 | 92 |
| 93 /* these are set at sample creation time... */ | |
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94 SOUND_SAMPLEFLAG_CANSEEK = 1, |
| 0 | 95 |
| 96 /* these are set during decoding... */ | |
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97 SOUND_SAMPLEFLAG_EOF = 1 << 29, |
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98 SOUND_SAMPLEFLAG_ERROR = 1 << 30, |
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99 SOUND_SAMPLEFLAG_EAGAIN = 1 << 31 |
| 0 | 100 } Sound_SampleFlags; |
| 101 | |
| 102 | |
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103 /** |
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104 * These are the basics of a decoded sample's data structure: data format |
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105 * (see AUDIO_U8 and friends in SDL_audio.h), number of channels, and sample |
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106 * rate. If you need more explanation than that, you should stop developing |
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107 * sound code right now. |
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108 * |
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109 * @param format Equivalent of SDL_AudioSpec.format. |
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110 * @param channels Number of sound channels. 1 == mono, 2 == stereo. |
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111 * @param rate Sample rate; frequency of sample points per second (44100, |
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112 * 22050, 8000, etc.) |
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113 */ |
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114 typedef struct __SOUND_AUDIOINFO__ |
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115 { |
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116 Uint16 format; |
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117 Uint8 channels; |
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118 Uint32 rate; |
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119 } Sound_AudioInfo; |
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120 |
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121 |
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122 /** |
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123 * Each decoder sets up one of these structs, which can be retrieved via |
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124 * the Sound_AvailableDecoders() function. EVERY FIELD IN THIS IS READ-ONLY. |
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125 * |
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126 * @param extensions File extensions, list ends with NULL. Read it like this: |
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127 * const char **ext; |
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128 * for (ext = info->extensions; *ext != NULL; ext++) |
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129 * printf(" File extension \"%s\"\n", *ext); |
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130 * @param description Human readable description of decoder. |
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131 * @param author "Name Of Author <email@emailhost.dom>" |
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132 * @param url URL specific to this decoder. |
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133 */ |
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134 typedef struct __SOUND_DECODERINFO__ |
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135 { |
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136 const char **extensions; |
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137 const char *description; |
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138 const char *author; |
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139 const char *url; |
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140 } Sound_DecoderInfo; |
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141 |
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142 |
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143 |
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144 /** |
| 0 | 145 * The Sound_Sample structure is the heart of SDL_sound. This holds |
| 146 * information about a source of sound data as it is being decoded. | |
| 147 * EVERY FIELD IN THIS IS READ-ONLY. Please use the API functions to | |
| 148 * change them. | |
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149 * |
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150 * @param opaque Internal use only. Don't touch. |
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151 * @param decoder Decoder used for this sample. |
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152 * @param desired Desired audio format for conversion. |
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153 * @param actual Actual audio format of sample. |
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154 * @param buffer Decoded sound data lands in here. |
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155 * @param buffer_size Current size of (buffer), in bytes (Uint8). |
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156 * @param flags Flags relating to this sample. |
| 0 | 157 */ |
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158 typedef struct __SOUND_SAMPLE__ |
| 0 | 159 { |
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160 void *opaque; |
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161 const Sound_DecoderInfo *decoder; |
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162 Sound_AudioInfo desired; |
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163 Sound_AudioInfo actual; |
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164 void *buffer; |
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165 Uint32 buffer_size; |
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166 Sound_SampleFlags flags; |
| 0 | 167 } Sound_Sample; |
| 168 | |
| 169 | |
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170 /** |
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171 * Just what it says: a major.minor.patch style version number... |
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172 * |
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173 * @param major The major version number. |
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174 * @param minor The minor version number. |
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175 * @param patch The patchlevel version number. |
| 0 | 176 */ |
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177 typedef struct __SOUND_VERSION__ |
| 0 | 178 { |
| 179 int major; | |
| 180 int minor; | |
| 181 int patch; | |
| 182 } Sound_Version; | |
| 183 | |
| 184 | |
| 185 | |
| 186 /* functions and macros... */ | |
| 187 | |
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188 #define SOUND_VERSION(x) { \ |
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189 (x)->major = SOUND_VER_MAJOR; \ |
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190 (x)->minor = SOUND_VER_MINOR; \ |
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191 (x)->patch = SOUND_VER_PATCH; \ |
| 0 | 192 } |
| 193 | |
| 194 /** | |
| 195 * Get the version of SDL_sound that is linked against your program. If you | |
| 196 * are using a shared library (DLL) version of SDL_sound, then it is possible | |
| 197 * that it will be different than the version you compiled against. | |
| 198 * | |
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199 * This is a real function; the macro SOUND_VERSION tells you what version |
| 0 | 200 * of SDL_sound you compiled against: |
| 201 * | |
| 202 * Sound_Version compiled; | |
| 203 * Sound_Version linked; | |
| 204 * | |
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205 * SOUND_VERSION(&compiled); |
| 0 | 206 * Sound_GetLinkedVersion(&linked); |
| 207 * printf("We compiled against SDL_sound version %d.%d.%d ...\n", | |
| 208 * compiled.major, compiled.minor, compiled.patch); | |
| 209 * printf("But we linked against SDL_sound version %d.%d.%d.\n", | |
| 210 * linked.major, linked.minor, linked.patch); | |
| 211 * | |
| 212 * This function may be called safely at any time, even before Sound_Init(). | |
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213 * |
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214 * @param ver Sound_Version structure to fill with shared library's version. |
| 0 | 215 */ |
| 216 extern DECLSPEC void Sound_GetLinkedVersion(Sound_Version *ver); | |
| 217 | |
| 218 | |
| 219 /** | |
| 220 * Initialize SDL_sound. This must be called before any other SDL_sound | |
| 221 * function (except perhaps Sound_GetLinkedVersion()). You should call | |
| 222 * SDL_Init() before calling this. Sound_Init() will attempt to call | |
| 223 * SDL_Init(SDL_INIT_AUDIO), just in case. This is a safe behaviour, but it | |
| 224 * may not configure SDL to your liking by itself. | |
| 225 * | |
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226 * @returns nonzero on success, zero on error. Specifics of the |
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227 * error can be gleaned from Sound_GetError(). |
| 0 | 228 */ |
| 229 extern DECLSPEC int Sound_Init(void); | |
| 230 | |
| 231 | |
| 232 /** | |
| 233 * Shutdown SDL_sound. This closes any SDL_RWops that were being used as | |
| 234 * sound sources, and frees any resources in use by SDL_sound. | |
| 235 * | |
| 236 * All Sound_Sample pointers you had prior to this call are INVALIDATED. | |
| 237 * | |
| 238 * Once successfully deinitialized, Sound_Init() can be called again to | |
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239 * restart the subsystem. All default API states are restored at this |
| 0 | 240 * point. |
| 241 * | |
| 242 * You should call this BEFORE SDL_Quit(). This will NOT call SDL_Quit() | |
| 243 * for you! | |
| 244 * | |
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245 * @returns nonzero on success, zero on error. Specifics of the error |
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246 * can be gleaned from Sound_GetError(). If failure, state of |
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247 * SDL_sound is undefined, and probably badly screwed up. |
| 0 | 248 */ |
| 249 extern DECLSPEC int Sound_Quit(void); | |
| 250 | |
| 251 | |
| 252 /** | |
| 253 * Get a list of sound formats supported by this implementation of SDL_sound. | |
| 254 * This is for informational purposes only. Note that the extension listed is | |
| 11 | 255 * merely convention: if we list "MP3", you can open an MPEG-1 Layer 3 audio |
| 0 | 256 * file with an extension of "XYZ", if you like. The file extensions are |
| 257 * informational, and only required as a hint to choosing the correct | |
| 258 * decoder, since the sound data may not be coming from a file at all, thanks | |
| 259 * to the abstraction that an SDL_RWops provides. | |
| 260 * | |
| 261 * The returned value is an array of pointers to Sound_DecoderInfo structures, | |
| 262 * with a NULL entry to signify the end of the list: | |
| 263 * | |
| 264 * Sound_DecoderInfo **i; | |
| 265 * | |
| 266 * for (i = Sound_AvailableDecoders(); *i != NULL; i++) | |
| 267 * { | |
| 268 * printf("Supported sound format: [%s], which is [%s].\n", | |
| 269 * i->extension, i->description); | |
| 270 * // ...and other fields... | |
| 271 * } | |
| 272 * | |
| 273 * The return values are pointers to static internal memory, and should | |
| 274 * be considered READ ONLY, and never freed. | |
| 275 * | |
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276 * @returns READ ONLY Null-terminated array of READ ONLY structures. |
| 0 | 277 */ |
| 278 extern DECLSPEC const Sound_DecoderInfo **Sound_AvailableDecoders(void); | |
| 279 | |
| 280 | |
| 281 /** | |
| 282 * Get the last SDL_sound error message as a null-terminated string. | |
| 283 * This will be NULL if there's been no error since the last call to this | |
| 284 * function. The pointer returned by this call points to an internal buffer. | |
| 285 * Each thread has a unique error state associated with it, but each time | |
| 286 * a new error message is set, it will overwrite the previous one associated | |
| 287 * with that thread. It is safe to call this function at anytime, even | |
| 288 * before Sound_Init(). | |
| 289 * | |
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290 * @returns READ ONLY string of last error message. |
| 0 | 291 */ |
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292 extern DECLSPEC const char *Sound_GetError(void); |
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293 |
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294 |
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295 /** |
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296 * Clear the current error message, so the next call to Sound_GetError() will |
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297 * return NULL. |
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298 */ |
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299 extern DECLSPEC void Sound_ClearError(void); |
| 0 | 300 |
| 301 | |
| 302 /** | |
| 303 * Start decoding a new sound sample. The data is read via an SDL_RWops | |
| 304 * structure (see SDL_rwops.h in the SDL include directory), so it may be | |
| 305 * coming from memory, disk, network stream, etc. The (ext) parameter is | |
| 306 * merely a hint to determining the correct decoder; if you specify, for | |
| 307 * example, "mp3" for an extension, and one of the decoders lists that | |
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308 * as a handled extension, then that decoder is given first shot at trying |
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309 * to claim the data for decoding. If none of the extensions match (or the |
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310 * extension is NULL), then every decoder examines the data to determine if |
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311 * it can handle it, until one accepts it. In such a case your SDL_RWops will |
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312 * need to be capable of rewinding to the start of the stream. |
| 0 | 313 * If no decoders can handle the data, a NULL value is returned, and a human |
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314 * readable error message can be fetched from Sound_GetError(). |
| 0 | 315 * Optionally, a desired audio format can be specified. If the incoming data |
| 316 * is in a different format, SDL_sound will convert it to the desired format | |
| 317 * on the fly. Note that this can be an expensive operation, so it may be | |
| 318 * wise to convert data before you need to play it back, if possible, or | |
| 319 * make sure your data is initially in the format that you need it in. | |
| 320 * If you don't want to convert the data, you can specify NULL for a desired | |
| 321 * format. The incoming format of the data, preconversion, can be found | |
| 322 * in the Sound_Sample structure. | |
| 323 * Note that the raw sound data "decoder" needs you to specify both the | |
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324 * extension "RAW" and a "desired" format, or it will refuse to handle |
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325 * the data. This is to prevent it from catching all formats unsupported |
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326 * by the other decoders. |
| 0 | 327 * Finally, specify an initial buffer size; this is the number of bytes that |
| 328 * will be allocated to store each read from the sound buffer. The more you | |
| 329 * can safely allocate, the more decoding can be done in one block, but the | |
| 330 * more resources you have to use up, and the longer each decoding call will | |
| 331 * take. Note that different data formats require more or less space to | |
| 332 * store. This buffer can be resized via Sound_SetBufferSize() ... | |
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333 * The buffer size specified must be a multiple of the size of a single |
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334 * sample point. So, if you want 16-bit, stereo samples, then your sample |
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335 * point size is (2 channels * 16 bits), or 32 bits per sample, which is four |
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336 * bytes. In such a case, you could specify 128 or 132 bytes for a buffer, |
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337 * but not 129, 130, or 131 (although in reality, you'll want to specify a |
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338 * MUCH larger buffer). |
| 0 | 339 * When you are done with this Sound_Sample pointer, you can dispose of it |
| 340 * via Sound_FreeSample(). | |
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341 * You do not have to keep a reference to (rw) around. If this function |
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342 * suceeds, it stores (rw) internally (and disposes of it during the call |
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343 * to Sound_FreeSample()). If this function fails, it will dispose of the |
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344 * SDL_RWops for you. |
| 0 | 345 * |
| 346 * @param rw SDL_RWops with sound data. | |
| 347 * @param ext File extension normally associated with a data format. | |
| 348 * Can usually be NULL. | |
| 349 * @param desired Format to convert sound data into. Can usually be NULL, | |
| 350 * if you don't need conversion. | |
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351 * @returns Sound_Sample pointer, which is used as a handle to several other |
| 0 | 352 * SDL_sound APIs. NULL on error. If error, use |
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353 * Sound_GetError() to see what went wrong. |
| 0 | 354 */ |
| 355 extern DECLSPEC Sound_Sample *Sound_NewSample(SDL_RWops *rw, const char *ext, | |
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356 Sound_AudioInfo *desired, |
| 0 | 357 Uint32 bufferSize); |
| 358 | |
| 359 /** | |
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360 * This is identical to Sound_NewSample(), but it creates an SDL_RWops for you |
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361 * from the file located in (filename). Note that (filename) is specified in |
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362 * platform-dependent notation. ("C:\\music\\mysong.mp3" on windows, and |
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363 * "/home/icculus/music/mysong.mp3" or whatever on Unix, etc.) |
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364 * Sound_NewSample()'s "ext" parameter is gleaned from the contents of |
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365 * (filename). |
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366 * |
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367 * @param filename file containing sound data. |
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368 * @param desired Format to convert sound data into. Can usually be NULL, |
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369 * if you don't need conversion. |
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370 * @param bufferSize size, in bytes, of initial read buffer. |
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371 * @returns Sound_Sample pointer, which is used as a handle to several other |
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372 * SDL_sound APIs. NULL on error. If error, use |
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373 * Sound_GetError() to see what went wrong. |
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374 */ |
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375 extern DECLSPEC Sound_Sample *Sound_NewSampleFromFile(const char *filename, |
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376 Sound_AudioInfo *desired, |
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377 Uint32 bufferSize); |
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378 |
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379 /** |
| 0 | 380 * Dispose of a Sound_Sample pointer that was returned from Sound_NewSample(). |
| 381 * This will also close/dispose of the SDL_RWops that was used at creation | |
| 382 * time, so there's no need to keep a reference to that around. | |
| 383 * The Sound_Sample pointer is invalid after this call, and will almost | |
| 384 * certainly result in a crash if you attempt to keep using it. | |
| 385 * | |
| 386 * @param sample The Sound_Sample to delete. | |
| 387 */ | |
| 388 extern DECLSPEC void Sound_FreeSample(Sound_Sample *sample); | |
| 389 | |
| 390 | |
| 391 /** | |
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392 * Change the current buffer size for a sample. If the buffer size could |
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393 * be changed, then the sample->buffer and sample->buffer_size fields will |
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394 * reflect that. If they could not be changed, then your original sample |
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395 * state is preserved. If the buffer is shrinking, the data at the end of |
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396 * buffer is truncated. If the buffer is growing, the contents of the new |
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397 * space at the end is undefined until you decode more into it or initialize |
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398 * it yourself. |
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399 * |
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400 * The buffer size specified must be a multiple of the size of a single |
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401 * sample point. So, if you want 16-bit, stereo samples, then your sample |
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402 * point size is (2 channels * 16 bits), or 32 bits per sample, which is four |
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403 * bytes. In such a case, you could specify 128 or 132 bytes for a buffer, |
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404 * but not 129, 130, or 131 (although in reality, you'll want to specify a |
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405 * MUCH larger buffer). |
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406 * |
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407 * @param sample The Sound_Sample whose buffer to modify. |
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408 * @param new_size The desired size, in bytes, of the new buffer. |
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409 * @returns non-zero if buffer size changed, zero on failure. |
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410 */ |
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411 extern DECLSPEC int Sound_SetBufferSize(Sound_Sample *sample, Uint32 new_size); |
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412 |
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413 |
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414 /** |
| 0 | 415 * Decode more of the sound data in a Sound_Sample. It will decode at most |
| 416 * sample->buffer_size bytes into sample->buffer in the desired format, and | |
| 417 * return the number of decoded bytes. | |
| 418 * If sample->buffer_size bytes could not be decoded, then please refer to | |
| 419 * sample->flags to determine if this was an End-of-stream or error condition. | |
| 420 * | |
| 421 * @param sample Do more decoding to this Sound_Sample. | |
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422 * @returns number of bytes decoded into sample->buffer. If it is less than |
| 0 | 423 * sample->buffer_size, then you should check sample->flags to see |
| 424 * what the current state of the sample is (EOF, error, read again). | |
| 425 */ | |
| 426 extern DECLSPEC Uint32 Sound_Decode(Sound_Sample *sample); | |
| 427 | |
| 428 | |
| 429 /** | |
| 430 * Decode the remainder of the sound data in a Sound_Sample. This will | |
| 431 * dynamically allocate memory for the ENTIRE remaining sample. | |
| 432 * sample->buffer_size and sample->buffer will be updated to reflect the | |
| 433 * new buffer. Please refer to sample->flags to determine if the decoding | |
| 434 * finished due to an End-of-stream or error condition. | |
| 435 * | |
| 436 * Be aware that sound data can take a large amount of memory, and that | |
| 437 * this function may block for quite awhile while processing. Also note | |
| 438 * that a streaming source (for example, from a SDL_RWops that is getting | |
| 439 * fed from an Internet radio feed that doesn't end) may fill all available | |
| 440 * memory before giving up...be sure to use this on finite sound sources | |
| 441 * only! | |
| 442 * | |
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443 * When decoding the sample in its entirety, the work is done one buffer at a |
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444 * time. That is, sound is decoded in sample->buffer_size blocks, and |
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445 * appended to a continually-growing buffer until the decoding completes. |
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446 * That means that this function will need enough RAM to hold approximately |
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447 * sample->buffer_size bytes plus the complete decoded sample at most. The |
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448 * larger your buffer size, the less overhead this function needs, but beware |
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449 * the possibility of paging to disk. Best to make this user-configurable if |
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450 * the sample isn't specific and small. |
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451 * |
| 0 | 452 * @param sample Do all decoding for this Sound_Sample. |
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453 * @returns number of bytes decoded into sample->buffer. You should check |
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454 * sample->flags to see what the current state of the sample is |
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455 * (EOF, error, read again). |
| 0 | 456 */ |
| 457 extern DECLSPEC Uint32 Sound_DecodeAll(Sound_Sample *sample); | |
| 458 | |
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459 |
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460 /** |
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461 * Restart a sample at the start of its waveform data, as if newly |
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462 * created with Sound_NewSample(). If successful, the next call to |
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463 * Sound_Decode[All]() will give audio data from the earliest point |
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464 * in the stream. |
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465 * |
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466 * Beware that this function will fail if the SDL_RWops that feeds the |
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467 * decoder can not be rewound via it's seek method, but this can |
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468 * theoretically be avoided by wrapping it in some sort of buffering |
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469 * SDL_RWops. |
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470 * |
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471 * This function should ONLY fail if the RWops is not seekable, or |
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472 * SDL_sound is not initialized. Both can be controlled by the application, |
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473 * and thus, it is up to the developer's paranoia to dictate whether this |
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474 * function's return value need be checked at all. |
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475 * |
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476 * If this function fails, the state of the sample is undefined, but it |
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477 * is still safe to call Sound_FreeSample() to dispose of it. |
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478 * |
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479 * On success, ERROR, EOF, and EAGAIN are cleared from sample->flags. The |
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480 * ERROR flag is set on error. |
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481 * |
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482 * @param sample The Sound_Sample to rewind. |
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483 * @return nonzero on success, zero on error. Specifics of the |
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484 * error can be gleaned from Sound_GetError(). |
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485 */ |
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486 extern DECLSPEC int Sound_Rewind(Sound_Sample *sample); |
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487 |
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488 |
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489 /** |
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490 * Reposition a sample's stream. If successful, the next call to |
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491 * Sound_Decode[All]() will give audio data from the offset you |
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492 * specified. |
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493 * |
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494 * The offset is specified in milliseconds from the start of the |
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495 * sample. |
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496 * |
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497 * Beware that this function can fail for several reasons. If the |
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498 * SDL_RWops that feeds the decoder can not seek, this call will almost |
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499 * certainly fail, but this can theoretically be avoided by wrapping it |
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500 * in some sort of buffering SDL_RWops. Some decoders can never seek, |
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501 * others can only seek with certain files. The decoders will set a flag |
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502 * in the sample at creation time to help you determine this. |
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503 * |
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504 * You should check sample->flags & SOUND_SAMPLEFLAG_CANSEEK |
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505 * before attempting. Sound_Seek() reports failure immediately if this |
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506 * flag isn't set. This function can still fail for other reasons if the |
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507 * flag is set. |
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508 * |
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509 * This function can be emulated in the application with Sound_Rewind() |
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510 * and predecoding a specific amount of the sample, but this can be |
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511 * extremely inefficient. Sound_Seek() accelerates the seek on a |
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512 * with decoder-specific code. |
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513 * |
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514 * If this function fails, the sample should continue to function as if |
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515 * this call was never made. If there was an unrecoverable error, |
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516 * sample->flags & SOUND_SAMPLEFLAG_ERROR will be set, which you regular |
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517 * decoding loop can pick up. |
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518 * |
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519 * On success, ERROR, EOF, and EAGAIN are cleared from sample->flags. |
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520 * |
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521 * @param sample The Sound_Sample to seek. |
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522 * @param ms The new position, in milliseconds from start of sample. |
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523 * @return nonzero on success, zero on error. Specifics of the |
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524 * error can be gleaned from Sound_GetError(). |
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525 */ |
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526 extern DECLSPEC int Sound_Seek(Sound_Sample *sample, Uint32 ms); |
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527 |
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528 |
| 0 | 529 #ifdef __cplusplus |
| 530 } | |
| 531 #endif | |
| 532 | |
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533 #endif /* !defined _INCLUDE_SDL_SOUND_H_ */ |
| 0 | 534 |
| 535 /* end of SDL_sound.h ... */ | |
| 536 |