Mercurial > SDL_sound_CoreAudio
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 |
|---|---|
| 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 | |
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401
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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__ |
| 301 | 41 #endif |
| 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 |
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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 |
| 4 | 76 typedef struct __SOUND_DECODERFUNCTIONS__ |
| 77 { | |
| 78 /* This is a block of info about your decoder. See SDL_sound.h. */ | |
| 79 const Sound_DecoderInfo info; | |
| 80 | |
| 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 | 105 * Returns non-zero if (sample) has a valid fileformat that this |
| 106 * driver can handle. Zero if this driver can NOT handle the data. | |
| 107 * | |
| 108 * Extension, which may be NULL, is just a hint as to the form of | |
| 109 * data that is being passed in. Most decoders should determine if | |
| 110 * they can handle the data by the data itself, but others, like | |
| 111 * the raw data handler, need this hint to know if they should | |
| 112 * accept the data in the first place. | |
| 113 * | |
| 114 * (sample)'s (opaque) field should be cast to a Sound_SampleInternal | |
| 115 * pointer: | |
| 116 * | |
| 117 * Sound_SampleInternal *internal; | |
| 118 * internal = (Sound_SampleInternal *) sample->opaque; | |
| 119 * | |
| 120 * Certain fields of sample will be filled in for the decoder before | |
| 121 * this call, and others should be filled in by the decoder. Some | |
| 122 * fields are offlimits, and should NOT be modified. The list: | |
| 123 * | |
| 124 * in Sound_SampleInternal section: | |
| 125 * Sound_Sample *next; (offlimits) | |
| 126 * Sound_Sample *prev; (offlimits) | |
| 127 * SDL_RWops *rw; (can use, but do NOT close it) | |
| 128 * const Sound_DecoderFunctions *funcs; (that's this structure) | |
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129 * Sound_AudioCVT sdlcvt; (offlimits) |
| 4 | 130 * void *buffer; (offlimits until read() method) |
| 131 * Uint32 buffer_size; (offlimits until read() method) | |
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132 * void *decoder_private; (read and write access) |
| 4 | 133 * |
| 134 * in rest of Sound_Sample: | |
| 135 * void *opaque; (this was internal section, above) | |
| 136 * const Sound_DecoderInfo *decoder; (read only) | |
| 137 * Sound_AudioInfo desired; (read only, usually not needed here) | |
| 138 * Sound_AudioInfo actual; (please fill this in) | |
| 139 * void *buffer; (offlimits) | |
| 140 * Uint32 buffer_size; (offlimits) | |
| 141 * Sound_SampleFlags flags; (set appropriately) | |
| 142 */ | |
| 143 int (*open)(Sound_Sample *sample, const char *ext); | |
| 144 | |
| 145 /* | |
| 146 * Clean up. SDL_sound is done with this sample, so the decoder should | |
| 147 * clean up any resources it allocated. Anything that wasn't | |
| 148 * explicitly allocated by the decoder should be LEFT ALONE, since | |
| 149 * the higher-level SDL_sound layer will clean up its own mess. | |
| 150 */ | |
| 151 void (*close)(Sound_Sample *sample); | |
| 152 | |
| 153 /* | |
| 154 * Get more data from (sample). The decoder should get a pointer to | |
| 155 * the internal structure... | |
| 156 * | |
| 157 * Sound_SampleInternal *internal; | |
| 158 * internal = (Sound_SampleInternal *) sample->opaque; | |
| 159 * | |
| 160 * ...and then start decoding. Fill in up to internal->buffer_size | |
| 161 * bytes of decoded sound in the space pointed to by | |
| 162 * internal->buffer. The encoded data is read in from internal->rw. | |
| 163 * Data should be decoded in the format specified during the | |
| 164 * decoder's open() method in the sample->actual field. The | |
| 165 * conversion to the desired format is done at a higher level. | |
| 166 * | |
| 167 * The return value is the number of bytes decoded into | |
| 168 * internal->buffer, which can be no more than internal->buffer_size, | |
| 169 * but can be less. If it is less, you should set a state flag: | |
| 170 * | |
| 171 * If there's just no more data (end of file, etc), then do: | |
| 172 * sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 173 * | |
| 174 * If there's an unrecoverable error, then do: | |
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175 * __Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG); |
| 4 | 176 * sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 177 * | |
| 178 * If there's more data, but you'd have to block for considerable | |
| 179 * amounts of time to get at it, or there's a recoverable error, | |
| 180 * then do: | |
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181 * __Sound_SetError(ERR_EXPLAIN_WHAT_WENT_WRONG); |
| 4 | 182 * sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; |
| 183 * | |
| 184 * SDL_sound will not call your read() method for any samples with | |
| 185 * SOUND_SAMPLEFLAG_EOF or SOUND_SAMPLEFLAG_ERROR set. The | |
| 186 * SOUND_SAMPLEFLAG_EAGAIN flag is reset before each call to this | |
| 187 * method. | |
| 188 */ | |
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189 Uint32 (*read)(Sound_Sample *sample); |
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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 |
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196 * an application could get by just recreating the sample externally; |
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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); |
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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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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 | 224 } Sound_DecoderFunctions; |
| 225 | |
| 226 | |
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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 |
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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 |
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251 typedef void (*MixFunc)(float *dst, void *src, Uint32 frames, float *gains); |
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252 |
| 4 | 253 typedef struct __SOUND_SAMPLEINTERNAL__ |
| 254 { | |
| 255 Sound_Sample *next; | |
| 256 Sound_Sample *prev; | |
| 257 SDL_RWops *rw; | |
| 258 const Sound_DecoderFunctions *funcs; | |
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259 Sound_AudioCVT sdlcvt; |
| 4 | 260 void *buffer; |
| 261 Uint32 buffer_size; | |
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262 void *decoder_private; |
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263 Sint32 total_time; |
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264 Uint32 mix_position; |
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265 MixFunc mix; |
| 4 | 266 } Sound_SampleInternal; |
| 267 | |
| 268 | |
| 269 /* error messages... */ | |
| 270 #define ERR_IS_INITIALIZED "Already initialized" | |
| 271 #define ERR_NOT_INITIALIZED "Not initialized" | |
| 272 #define ERR_INVALID_ARGUMENT "Invalid argument" | |
| 273 #define ERR_OUT_OF_MEMORY "Out of memory" | |
| 274 #define ERR_NOT_SUPPORTED "Operation not supported" | |
| 275 #define ERR_UNSUPPORTED_FORMAT "Sound format unsupported" | |
| 276 #define ERR_NOT_A_HANDLE "Not a file handle" | |
| 277 #define ERR_NO_SUCH_FILE "No such file" | |
| 278 #define ERR_PAST_EOF "Past end of file" | |
| 279 #define ERR_IO_ERROR "I/O error" | |
| 280 #define ERR_COMPRESSION "(De)compression error" | |
| 281 #define ERR_PREV_ERROR "Previous decoding already caused an error" | |
| 282 #define ERR_PREV_EOF "Previous decoding already triggered EOF" | |
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283 #define ERR_CANNOT_SEEK "Sample is not seekable" |
| 4 | 284 |
| 285 /* | |
| 286 * Call this to set the message returned by Sound_GetError(). | |
| 287 * Please only use the ERR_* constants above, or add new constants to the | |
| 288 * above group, but I want these all in one place. | |
| 289 * | |
| 290 * Calling this with a NULL argument is a safe no-op. | |
| 291 */ | |
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292 void __Sound_SetError(const char *err); |
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293 |
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294 /* |
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295 * Call this to convert milliseconds to an actual byte position, based on |
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296 * audio data characteristics. |
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297 */ |
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298 Uint32 __Sound_convertMsToBytePos(Sound_AudioInfo *info, Uint32 ms); |
| 4 | 299 |
| 300 /* | |
| 301 * Use this if you need a cross-platform stricmp(). | |
| 302 */ | |
| 303 int __Sound_strcasecmp(const char *x, const char *y); | |
| 304 | |
| 305 | |
| 306 /* These get used all over for lessening code clutter. */ | |
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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 | 309 |
| 310 | |
| 311 | |
| 312 | |
| 313 /*--------------------------------------------------------------------------*/ | |
| 314 /*--------------------------------------------------------------------------*/ | |
| 315 /*------------ ----------------*/ | |
| 316 /*------------ You MUST implement the following functions ----------------*/ | |
| 317 /*------------ if porting to a new platform. ----------------*/ | |
| 318 /*------------ (see platform/unix.c for an example) ----------------*/ | |
| 319 /*------------ ----------------*/ | |
| 320 /*--------------------------------------------------------------------------*/ | |
| 321 /*--------------------------------------------------------------------------*/ | |
| 322 | |
| 323 | |
| 324 /* (None, right now.) */ | |
| 325 | |
| 326 | |
| 327 #ifdef __cplusplus | |
| 328 extern "C" { | |
| 329 #endif | |
| 330 | |
| 331 #endif /* defined _INCLUDE_SDL_SOUND_INTERNAL_H_ */ | |
| 332 | |
| 333 /* end of SDL_sound_internal.h ... */ | |
| 334 |