Mercurial > SDL_sound_CoreAudio
annotate decoders/wav.c @ 47:ea58bc3b15d7
Added init() and quit() methods.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 22 Sep 2001 14:41:38 +0000 |
| parents | c15396fc0e55 |
| children | b13fafb976be |
| rev | line source |
|---|---|
| 17 | 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 * WAV decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles Microsoft .WAVs, in as many of the thousands of | |
| 24 * variations as we can. | |
| 25 * | |
| 26 * Please see the file LICENSE in the source's root directory. | |
| 27 * | |
| 28 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 29 */ | |
| 30 | |
| 31 #include <stdio.h> | |
| 32 #include <stdlib.h> | |
| 33 #include <string.h> | |
| 34 #include <assert.h> | |
| 35 #include "SDL_sound.h" | |
| 36 | |
| 37 #define __SDL_SOUND_INTERNAL__ | |
| 38 #include "SDL_sound_internal.h" | |
| 39 | |
| 40 #if (!defined SOUND_SUPPORTS_WAV) | |
| 41 #error SOUND_SUPPORTS_WAV must be defined. | |
| 42 #endif | |
| 43 | |
|
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ea58bc3b15d7
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44 static int WAV_init(void); |
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ea58bc3b15d7
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45 static void WAV_quit(void); |
| 17 | 46 static int WAV_open(Sound_Sample *sample, const char *ext); |
| 47 static void WAV_close(Sound_Sample *sample); | |
| 48 static Uint32 WAV_read(Sound_Sample *sample); | |
| 49 | |
| 50 const Sound_DecoderFunctions __Sound_DecoderFunctions_WAV = | |
| 51 { | |
| 52 { | |
| 53 "WAV", | |
| 54 "Microsoft WAVE audio format", | |
| 55 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 56 "http://www.icculus.org/SDL_sound/" | |
| 57 }, | |
| 58 | |
|
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59 WAV_init, /* init() method */ |
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60 WAV_quit, /* quit() method */ |
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61 WAV_open, /* open() method */ |
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62 WAV_close, /* close() method */ |
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63 WAV_read /* read() method */ |
| 17 | 64 }; |
| 65 | |
| 66 | |
| 67 /* this is what we store in our internal->decoder_private field... */ | |
| 68 typedef struct | |
| 69 { | |
| 70 Sint32 bytesLeft; | |
| 71 } wav_t; | |
| 72 | |
| 73 | |
| 74 /* Chunk management code... */ | |
| 75 | |
| 76 #define riffID 0x46464952 /* "RIFF", in ascii. */ | |
| 77 #define waveID 0x45564157 /* "WAVE", in ascii. */ | |
| 78 | |
| 79 | |
| 80 #define fmtID 0x20746D66 /* "fmt ", in ascii. */ | |
| 81 | |
| 82 #define FMT_NORMAL 1 /* Uncompressed waveform data. */ | |
| 83 | |
| 84 typedef struct | |
| 85 { | |
| 86 Uint32 chunkID; | |
| 87 Sint32 chunkSize; | |
| 88 Sint16 wFormatTag; | |
| 89 Uint16 wChannels; | |
| 90 Uint32 dwSamplesPerSec; | |
| 91 Uint32 dwAvgBytesPerSec; | |
| 92 Uint16 wBlockAlign; | |
| 93 Uint16 wBitsPerSample; | |
| 94 } fmt_t; | |
| 95 | |
| 96 | |
|
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97 static int WAV_init(void) |
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98 { |
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99 return(1); /* always succeeds. */ |
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100 } /* WAV_init */ |
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101 |
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102 |
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103 static void WAV_quit(void) |
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104 { |
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105 /* it's a no-op. */ |
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106 } /* WAV_quit */ |
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107 |
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108 |
| 17 | 109 /* |
| 110 * Read in a fmt_t from disk. This makes this process safe regardless of | |
| 111 * the processor's byte order or how the fmt_t structure is packed. | |
| 112 */ | |
| 113 static int read_fmt_chunk(SDL_RWops *rw, fmt_t *fmt) | |
| 114 { | |
| 115 /* skip reading the chunk ID, since it was already read at this point... */ | |
| 116 fmt->chunkID = fmtID; | |
| 117 | |
| 118 if (SDL_RWread(rw, &fmt->chunkSize, sizeof (fmt->chunkSize), 1) != 1) | |
| 119 return(0); | |
| 120 fmt->chunkSize = SDL_SwapLE32(fmt->chunkSize); | |
| 121 | |
| 122 if (SDL_RWread(rw, &fmt->wFormatTag, sizeof (fmt->wFormatTag), 1) != 1) | |
| 123 return(0); | |
| 124 fmt->wFormatTag = SDL_SwapLE16(fmt->wFormatTag); | |
| 125 | |
| 126 if (SDL_RWread(rw, &fmt->wChannels, sizeof (fmt->wChannels), 1) != 1) | |
| 127 return(0); | |
| 128 fmt->wChannels = SDL_SwapLE16(fmt->wChannels); | |
| 129 | |
| 130 if (SDL_RWread(rw, &fmt->dwSamplesPerSec, | |
| 131 sizeof (fmt->dwSamplesPerSec), 1) != 1) | |
| 132 return(0); | |
| 133 fmt->dwSamplesPerSec = SDL_SwapLE32(fmt->dwSamplesPerSec); | |
| 134 | |
| 135 if (SDL_RWread(rw, &fmt->dwAvgBytesPerSec, | |
| 136 sizeof (fmt->dwAvgBytesPerSec), 1) != 1) | |
| 137 return(0); | |
| 138 fmt->dwAvgBytesPerSec = SDL_SwapLE32(fmt->dwAvgBytesPerSec); | |
| 139 | |
| 140 if (SDL_RWread(rw, &fmt->wBlockAlign, sizeof (fmt->wBlockAlign), 1) != 1) | |
| 141 return(0); | |
| 142 fmt->wBlockAlign = SDL_SwapLE16(fmt->wBlockAlign); | |
| 143 | |
| 144 if (SDL_RWread(rw, &fmt->wBitsPerSample, | |
| 145 sizeof (fmt->wBitsPerSample), 1) != 1) | |
| 146 return(0); | |
| 147 fmt->wBitsPerSample = SDL_SwapLE16(fmt->wBitsPerSample); | |
| 148 | |
| 149 return(1); | |
| 150 } /* read_fmt_chunk */ | |
| 151 | |
| 152 | |
| 153 #define dataID 0x61746164 /* "data", in ascii. */ | |
| 154 | |
| 155 typedef struct | |
| 156 { | |
| 157 Uint32 chunkID; | |
| 158 Sint32 chunkSize; | |
| 159 /* Then, (chunkSize) bytes of waveform data... */ | |
| 160 } data_t; | |
| 161 | |
| 162 | |
| 163 /* | |
| 164 * Read in a fmt_t from disk. This makes this process safe regardless of | |
| 165 * the processor's byte order or how the fmt_t structure is packed. | |
| 166 */ | |
| 167 static int read_data_chunk(SDL_RWops *rw, data_t *data) | |
| 168 { | |
| 169 /* skip reading the chunk ID, since it was already read at this point... */ | |
| 170 data->chunkID = dataID; | |
| 171 | |
| 172 if (SDL_RWread(rw, &data->chunkSize, sizeof (data->chunkSize), 1) != 1) | |
| 173 return(0); | |
| 174 data->chunkSize = SDL_SwapLE32(data->chunkSize); | |
| 175 | |
| 176 return(1); | |
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177 } /* read_data_chunk */ |
| 17 | 178 |
| 179 | |
| 180 static int find_chunk(SDL_RWops *rw, Uint32 id) | |
| 181 { | |
| 182 Sint32 siz = 0; | |
| 183 Uint32 _id = 0; | |
| 184 | |
| 185 while (1) | |
| 186 { | |
| 187 BAIL_IF_MACRO(SDL_RWread(rw, &_id, sizeof (_id), 1) != 1, NULL, 0); | |
| 188 if (SDL_SwapLE32(_id) == id) | |
| 189 return(1); | |
| 190 | |
| 191 BAIL_IF_MACRO(SDL_RWread(rw, &siz, sizeof (siz), 1) != 1, NULL, 0); | |
| 192 siz = SDL_SwapLE32(siz); | |
| 193 assert(siz > 0); | |
| 194 BAIL_IF_MACRO(SDL_RWseek(rw, siz, SEEK_SET) != siz, NULL, 0); | |
| 195 } /* while */ | |
| 196 | |
| 197 return(0); /* shouldn't hit this, but just in case... */ | |
| 198 } /* find_chunk */ | |
| 199 | |
| 200 | |
| 201 static int WAV_open(Sound_Sample *sample, const char *ext) | |
| 202 { | |
| 203 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 204 SDL_RWops *rw = internal->rw; | |
| 205 fmt_t f; | |
| 206 data_t d; | |
| 207 wav_t *w; | |
| 208 | |
| 209 BAIL_IF_MACRO(SDL_ReadLE32(rw) != riffID, "WAV: Not a RIFF file.", 0); | |
| 210 SDL_ReadLE32(rw); /* throw the length away; we get this info later. */ | |
| 211 BAIL_IF_MACRO(SDL_ReadLE32(rw) != waveID, "WAV: Not a WAVE file.", 0); | |
| 212 BAIL_IF_MACRO(!find_chunk(rw, fmtID), "WAV: No format chunk.", 0); | |
| 213 BAIL_IF_MACRO(!read_fmt_chunk(rw, &f), "WAV: Can't read format chunk.", 0); | |
| 214 | |
| 215 /* !!! FIXME: This will have to change for compression types... */ | |
| 216 BAIL_IF_MACRO(f.wFormatTag != FMT_NORMAL, "WAV: Unsupported encoding.", 0); | |
| 217 | |
| 218 sample->actual.channels = (Uint8) f.wChannels; | |
| 219 sample->actual.rate = f.dwSamplesPerSec; | |
| 220 | |
| 221 if (f.wBitsPerSample <= 8) | |
| 222 sample->actual.format = AUDIO_U8; | |
| 223 else if (f.wBitsPerSample <= 16) | |
| 224 sample->actual.format = AUDIO_S16LSB; | |
| 225 else | |
| 226 BAIL_MACRO("WAV: Unsupported sample size.", 0); | |
| 227 | |
| 228 BAIL_IF_MACRO(!find_chunk(rw, dataID), "WAV: No data chunk.", 0); | |
| 229 BAIL_IF_MACRO(!read_data_chunk(rw, &d), "WAV: Can't read data chunk.", 0); | |
| 230 | |
| 231 w = (wav_t *) malloc(sizeof(wav_t)); | |
| 232 BAIL_IF_MACRO(w == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 233 w->bytesLeft = d.chunkSize; | |
| 234 internal->decoder_private = (void *) w; | |
| 235 | |
| 236 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 237 | |
| 238 _D(("WAV: Accepting data stream.\n")); | |
| 239 return(1); /* we'll handle this data. */ | |
| 240 } /* WAV_open */ | |
| 241 | |
| 242 | |
| 243 static void WAV_close(Sound_Sample *sample) | |
| 244 { | |
| 245 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 246 free(internal->decoder_private); | |
| 247 } /* WAV_close */ | |
| 248 | |
| 249 | |
| 250 static Uint32 WAV_read(Sound_Sample *sample) | |
| 251 { | |
| 252 Uint32 retval; | |
| 253 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 254 wav_t *w = (wav_t *) internal->decoder_private; | |
| 255 Uint32 max = (internal->buffer_size < (Uint32) w->bytesLeft) ? | |
| 256 internal->buffer_size : (Uint32) w->bytesLeft; | |
| 257 | |
| 258 assert(max > 0); | |
| 259 | |
| 260 /* | |
| 261 * We don't actually do any decoding, so we read the wav data | |
| 262 * directly into the internal buffer... | |
| 263 */ | |
| 264 retval = SDL_RWread(internal->rw, internal->buffer, 1, max); | |
| 265 | |
| 266 w->bytesLeft -= retval; | |
| 267 | |
| 268 /* Make sure the read went smoothly... */ | |
| 269 if ((retval == 0) || (w->bytesLeft == 0)) | |
| 270 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 271 | |
| 272 else if (retval == -1) | |
| 273 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 274 | |
| 275 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 276 else if (retval < internal->buffer_size) | |
| 277 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 278 | |
| 279 return(retval); | |
| 280 } /* WAV_read */ | |
| 281 | |
| 282 | |
| 283 /* end of wav.c ... */ | |
| 284 |