Mercurial > SDL_sound_CoreAudio
annotate SDL_sound_internal.h @ 340:5a72981b8cba
Added optional, experimental audio conversion routines by Frank Ranostaj.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 20 May 2002 16:21:58 +0000 |
| parents | 31cc49d7d0ce |
| children | cbb15ecf423a |
| rev | line source |
|---|---|
| 4 | 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 /* | |
| 21 * Internal function/structure declaration. Do NOT include in your | |
| 22 * application. | |
| 23 * | |
|
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24 * Please see the file COPYING in the source's root directory. |
| 4 | 25 * |
| 26 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 27 */ | |
| 28 | |
| 29 #ifndef _INCLUDE_SDL_SOUND_INTERNAL_H_ | |
| 30 #define _INCLUDE_SDL_SOUND_INTERNAL_H_ | |
| 31 | |
| 32 #ifndef __SDL_SOUND_INTERNAL__ | |
| 33 #error Do not include this header from your applications. | |
| 34 #endif | |
| 35 | |
| 36 #include "SDL.h" | |
| 37 | |
| 322 | 38 #if (defined(_MSC_VER) && !defined(inline)) |
| 301 | 39 # define inline __inline__ |
| 40 #endif | |
| 41 | |
|
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42 #if (defined DEBUG_CHATTER) |
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43 #define SNDDBG(x) printf x |
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44 #else |
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45 #define SNDDBG(x) |
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46 #endif |
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47 |
| 4 | 48 typedef struct __SOUND_DECODERFUNCTIONS__ |
| 49 { | |
| 50 /* This is a block of info about your decoder. See SDL_sound.h. */ | |
| 51 const Sound_DecoderInfo info; | |
| 52 | |
| 53 /* | |
|
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54 * This is called during the Sound_Init() function. Use this to |
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55 * set up any global state that your decoder needs, such as |
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56 * initializing an external library, etc. |
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57 * |
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58 * Return non-zero if initialization is successful, zero if there's |
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59 * a fatal error. If this method fails, then this decoder is |
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60 * flagged as unavailable until SDL_sound() is shut down and |
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61 * reinitialized, in which case this method will be tried again. |
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62 * |
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63 * Note that the decoders quit() method won't be called if this |
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64 * method fails, so if you can't intialize, you'll have to clean |
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65 * up the half-initialized state in this method. |
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66 */ |
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67 int (*init)(void); |
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68 |
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69 /* |
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70 * This is called during the Sound_Quit() function. Use this to |
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71 * clean up any global state that your decoder has used during its |
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72 * lifespan. |
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73 */ |
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74 void (*quit)(void); |
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75 |
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76 /* |
| 4 | 77 * Returns non-zero if (sample) has a valid fileformat that this |
| 78 * driver can handle. Zero if this driver can NOT handle the data. | |
| 79 * | |
| 80 * Extension, which may be NULL, is just a hint as to the form of | |
| 81 * data that is being passed in. Most decoders should determine if | |
| 82 * they can handle the data by the data itself, but others, like | |
| 83 * the raw data handler, need this hint to know if they should | |
| 84 * accept the data in the first place. | |
| 85 * | |
| 86 * (sample)'s (opaque) field should be cast to a Sound_SampleInternal | |
| 87 * pointer: | |
| 88 * | |
| 89 * Sound_SampleInternal *internal; | |
| 90 * internal = (Sound_SampleInternal *) sample->opaque; | |
| 91 * | |
| 92 * Certain fields of sample will be filled in for the decoder before | |
| 93 * this call, and others should be filled in by the decoder. Some | |
| 94 * fields are offlimits, and should NOT be modified. The list: | |
| 95 * | |
| 96 * in Sound_SampleInternal section: | |
| 97 * Sound_Sample *next; (offlimits) | |
| 98 * Sound_Sample *prev; (offlimits) | |
| 99 * SDL_RWops *rw; (can use, but do NOT close it) | |
| 100 * const Sound_DecoderFunctions *funcs; (that's this structure) | |
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101 * Sound_AudioCVT sdlcvt; (offlimits) |
| 4 | 102 * void *buffer; (offlimits until read() method) |
| 103 * Uint32 buffer_size; (offlimits until read() method) | |
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104 * void *decoder_private; (read and write access) |
| 4 | 105 * |
| 106 * in rest of Sound_Sample: | |
| 107 * void *opaque; (this was internal section, above) | |
| 108 * const Sound_DecoderInfo *decoder; (read only) | |
| 109 * Sound_AudioInfo desired; (read only, usually not needed here) | |
| 110 * Sound_AudioInfo actual; (please fill this in) | |
| 111 * void *buffer; (offlimits) | |
| 112 * Uint32 buffer_size; (offlimits) | |
| 113 * Sound_SampleFlags flags; (set appropriately) | |
| 114 */ | |
| 115 int (*open)(Sound_Sample *sample, const char *ext); | |
| 116 | |
| 117 /* | |
| 118 * Clean up. SDL_sound is done with this sample, so the decoder should | |
| 119 * clean up any resources it allocated. Anything that wasn't | |
| 120 * explicitly allocated by the decoder should be LEFT ALONE, since | |
| 121 * the higher-level SDL_sound layer will clean up its own mess. | |
| 122 */ | |
| 123 void (*close)(Sound_Sample *sample); | |
| 124 | |
| 125 /* | |
| 126 * Get more data from (sample). The decoder should get a pointer to | |
| 127 * the internal structure... | |
| 128 * | |
| 129 * Sound_SampleInternal *internal; | |
| 130 * internal = (Sound_SampleInternal *) sample->opaque; | |
| 131 * | |
| 132 * ...and then start decoding. Fill in up to internal->buffer_size | |
| 133 * bytes of decoded sound in the space pointed to by | |
| 134 * internal->buffer. The encoded data is read in from internal->rw. | |
| 135 * Data should be decoded in the format specified during the | |
| 136 * decoder's open() method in the sample->actual field. The | |
| 137 * conversion to the desired format is done at a higher level. | |
| 138 * | |
| 139 * The return value is the number of bytes decoded into | |
| 140 * internal->buffer, which can be no more than internal->buffer_size, | |
| 141 * but can be less. If it is less, you should set a state flag: | |
| 142 * | |
| 143 * If there's just no more data (end of file, etc), then do: | |
| 144 * sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 145 * | |
| 146 * If there's an unrecoverable error, then do: | |
| 147 * Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG); | |
| 148 * sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 149 * | |
| 150 * If there's more data, but you'd have to block for considerable | |
| 151 * amounts of time to get at it, or there's a recoverable error, | |
| 152 * then do: | |
| 153 * Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG); | |
| 154 * sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 155 * | |
| 156 * SDL_sound will not call your read() method for any samples with | |
| 157 * SOUND_SAMPLEFLAG_EOF or SOUND_SAMPLEFLAG_ERROR set. The | |
| 158 * SOUND_SAMPLEFLAG_EAGAIN flag is reset before each call to this | |
| 159 * method. | |
| 160 */ | |
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161 Uint32 (*read)(Sound_Sample *sample); |
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162 |
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163 /* |
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164 * Reset the decoding to the beginning of the stream. Nonzero on |
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165 * success, zero on failure. |
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166 * |
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167 * The purpose of this method is to allow for higher efficiency than |
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168 * an application could get by just recreating the sample externally; |
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169 * not only do they not have to reopen the RWops, reallocate buffers, |
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170 * and potentially pass the data through several rejecting decoders, |
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171 * but certain decoders will not have to recreate their existing |
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172 * state (search for metadata, etc) since they already know they |
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173 * have a valid audio stream with a given set of characteristics. |
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174 * |
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175 * The decoder is responsible for calling seek() on the associated |
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176 * SDL_RWops. A failing call to seek() should be the ONLY reason that |
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177 * this method should ever fail! |
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178 */ |
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179 int (*rewind)(Sound_Sample *sample); |
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180 |
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181 /* |
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182 * Reposition the decoding to an arbitrary point. Nonzero on |
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183 * success, zero on failure. |
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184 * |
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185 * The purpose of this method is to allow for higher efficiency than |
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186 * an application could get by just rewinding the sample and |
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187 * decoding to a given point. |
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188 * |
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189 * The decoder is responsible for calling seek() on the associated |
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190 * SDL_RWops. |
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191 * |
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192 * If there is an error, try to recover so that the next read will |
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193 * continue as if nothing happened. |
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194 */ |
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195 int (*seek)(Sound_Sample *sample, Uint32 ms); |
| 4 | 196 } Sound_DecoderFunctions; |
| 197 | |
| 198 | |
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199 /* A structure to hold a set of audio conversion filters and buffers */ |
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200 #if (defined SOUND_USE_ALTCVT) |
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201 #include "alt_audio_convert.h" |
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202 #else |
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203 typedef struct Sound_AudioCVT |
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204 { |
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205 int needed; /* Set to 1 if conversion possible */ |
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206 Uint16 src_format; /* Source audio format */ |
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207 Uint16 dst_format; /* Target audio format */ |
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208 double rate_incr; /* Rate conversion increment */ |
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209 Uint8 *buf; /* Buffer to hold entire audio data */ |
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210 int len; /* Length of original audio buffer */ |
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211 int len_cvt; /* Length of converted audio buffer */ |
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212 int len_mult; /* buffer must be len*len_mult big */ |
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213 double len_ratio; /* Given len, final size is len*len_ratio */ |
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214 void (*filters[20])(struct Sound_AudioCVT *cvt, Uint16 *format); |
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215 int filter_index; /* Current audio conversion function */ |
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216 } Sound_AudioCVT; |
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217 #endif |
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218 |
| 4 | 219 typedef struct __SOUND_SAMPLEINTERNAL__ |
| 220 { | |
| 221 Sound_Sample *next; | |
| 222 Sound_Sample *prev; | |
| 223 SDL_RWops *rw; | |
| 224 const Sound_DecoderFunctions *funcs; | |
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225 Sound_AudioCVT sdlcvt; |
| 4 | 226 void *buffer; |
| 227 Uint32 buffer_size; | |
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228 void *decoder_private; |
| 4 | 229 } Sound_SampleInternal; |
| 230 | |
| 231 | |
| 232 /* error messages... */ | |
| 233 #define ERR_IS_INITIALIZED "Already initialized" | |
| 234 #define ERR_NOT_INITIALIZED "Not initialized" | |
| 235 #define ERR_INVALID_ARGUMENT "Invalid argument" | |
| 236 #define ERR_OUT_OF_MEMORY "Out of memory" | |
| 237 #define ERR_NOT_SUPPORTED "Operation not supported" | |
| 238 #define ERR_UNSUPPORTED_FORMAT "Sound format unsupported" | |
| 239 #define ERR_NOT_A_HANDLE "Not a file handle" | |
| 240 #define ERR_NO_SUCH_FILE "No such file" | |
| 241 #define ERR_PAST_EOF "Past end of file" | |
| 242 #define ERR_IO_ERROR "I/O error" | |
| 243 #define ERR_COMPRESSION "(De)compression error" | |
| 244 #define ERR_PREV_ERROR "Previous decoding already caused an error" | |
| 245 #define ERR_PREV_EOF "Previous decoding already triggered EOF" | |
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246 #define ERR_CANNOT_SEEK "Sample is not seekable" |
| 4 | 247 |
| 248 /* | |
| 249 * Call this to set the message returned by Sound_GetError(). | |
| 250 * Please only use the ERR_* constants above, or add new constants to the | |
| 251 * above group, but I want these all in one place. | |
| 252 * | |
| 253 * Calling this with a NULL argument is a safe no-op. | |
| 254 */ | |
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255 void __Sound_SetError(const char *err); |
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256 |
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257 /* !!! FIXME: Clean up elsewhere and get rid of this. */ |
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258 #define Sound_SetError __Sound_SetError |
| 4 | 259 |
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260 /* |
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261 * Call this to convert milliseconds to an actual byte position, based on |
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262 * audio data characteristics. |
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263 */ |
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264 Uint32 __Sound_convertMsToBytePos(Sound_AudioInfo *info, Uint32 ms); |
| 4 | 265 |
| 266 /* | |
| 267 * Use this if you need a cross-platform stricmp(). | |
| 268 */ | |
| 269 int __Sound_strcasecmp(const char *x, const char *y); | |
| 270 | |
| 271 | |
| 272 /* These get used all over for lessening code clutter. */ | |
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273 #define BAIL_MACRO(e, r) { __Sound_SetError(e); return r; } |
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274 #define BAIL_IF_MACRO(c, e, r) if (c) { __Sound_SetError(e); return r; } |
| 4 | 275 |
| 276 | |
| 277 | |
| 278 | |
| 279 /*--------------------------------------------------------------------------*/ | |
| 280 /*--------------------------------------------------------------------------*/ | |
| 281 /*------------ ----------------*/ | |
| 282 /*------------ You MUST implement the following functions ----------------*/ | |
| 283 /*------------ if porting to a new platform. ----------------*/ | |
| 284 /*------------ (see platform/unix.c for an example) ----------------*/ | |
| 285 /*------------ ----------------*/ | |
| 286 /*--------------------------------------------------------------------------*/ | |
| 287 /*--------------------------------------------------------------------------*/ | |
| 288 | |
| 289 | |
| 290 /* (None, right now.) */ | |
| 291 | |
| 292 | |
| 293 #ifdef __cplusplus | |
| 294 extern "C" { | |
| 295 #endif | |
| 296 | |
| 297 #endif /* defined _INCLUDE_SDL_SOUND_INTERNAL_H_ */ | |
| 298 | |
| 299 /* end of SDL_sound_internal.h ... */ | |
| 300 |