Mercurial > SDL_sound_CoreAudio
annotate decoders/au.c @ 294:9828311da44b
Minor cleanups.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 17 Mar 2002 21:17:23 +0000 |
| parents | 7c4f6ee02cd0 |
| children | c97be6e1bd27 |
| rev | line source |
|---|---|
| 213 | 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 * Sun/NeXT .au decoder for SDL_sound. | |
| 22 * Formats supported: 8 and 16 bit linear PCM, 8 bit µ-law. | |
| 23 * Files without valid header are assumed to be 8 bit µ-law, 8kHz, mono. | |
| 24 * | |
| 25 * Please see the file COPYING in the source's root directory. | |
| 26 * | |
| 27 * This file written by Mattias Engdegård. (f91-men@nada.kth.se) | |
| 28 */ | |
| 29 | |
| 30 #if HAVE_CONFIG_H | |
| 31 # include <config.h> | |
| 32 #endif | |
| 33 | |
| 34 #ifdef SOUND_SUPPORTS_AU | |
| 35 | |
| 36 #include <stdio.h> | |
| 37 #include <stdlib.h> | |
| 38 #include <string.h> | |
| 39 #include <assert.h> | |
| 40 | |
| 41 #include "SDL_sound.h" | |
| 42 | |
| 43 #define __SDL_SOUND_INTERNAL__ | |
| 44 #include "SDL_sound_internal.h" | |
| 45 | |
| 46 static int AU_init(void); | |
| 47 static void AU_quit(void); | |
| 48 static int AU_open(Sound_Sample *sample, const char *ext); | |
| 49 static void AU_close(Sound_Sample *sample); | |
| 50 static Uint32 AU_read(Sound_Sample *sample); | |
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51 static int AU_rewind(Sound_Sample *sample); |
| 213 | 52 |
| 53 /* | |
| 54 * Sometimes the extension ".snd" is used for these files (mostly on the NeXT), | |
| 55 * and the magic number comes from this. However it may clash with other | |
| 56 * formats and is somewhat of an anachronism, so only .au is used here. | |
| 57 */ | |
| 58 static const char *extensions_au[] = { "AU", NULL }; | |
| 59 const Sound_DecoderFunctions __Sound_DecoderFunctions_AU = | |
| 60 { | |
| 61 { | |
| 62 extensions_au, | |
| 63 "Sun/NeXT audio file format", | |
| 64 "Mattias Engdegård <f91-men@nada.kth.se>", | |
| 65 "http://www.icculus.org/SDL_sound/" | |
| 66 }, | |
| 67 | |
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68 AU_init, /* init() method */ |
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69 AU_quit, /* quit() method */ |
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70 AU_open, /* open() method */ |
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71 AU_close, /* close() method */ |
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72 AU_read, /* read() method */ |
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73 AU_rewind /* rewind() method */ |
| 213 | 74 }; |
| 75 | |
| 76 /* no init/deinit needed */ | |
| 77 static int AU_init(void) | |
| 78 { | |
| 79 return(1); | |
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80 } /* AU_init */ |
| 213 | 81 |
| 82 static void AU_quit(void) | |
| 83 { | |
| 84 /* no-op. */ | |
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85 } /* AU_quit */ |
| 213 | 86 |
| 87 struct au_file_hdr | |
| 88 { | |
| 89 Uint32 magic; | |
| 90 Uint32 hdr_size; | |
| 91 Uint32 data_size; | |
| 92 Uint32 encoding; | |
| 93 Uint32 sample_rate; | |
| 94 Uint32 channels; | |
| 95 }; | |
| 96 | |
| 97 #define HDR_SIZE 24 | |
| 98 | |
| 99 enum | |
| 100 { | |
| 101 AU_ENC_ULAW_8 = 1, /* 8-bit ISDN µ-law */ | |
| 102 AU_ENC_LINEAR_8 = 2, /* 8-bit linear PCM */ | |
| 103 AU_ENC_LINEAR_16 = 3, /* 16-bit linear PCM */ | |
| 104 | |
| 105 /* the rest are unsupported (I have never seen them in the wild) */ | |
| 106 AU_ENC_LINEAR_24 = 4, /* 24-bit linear PCM */ | |
| 107 AU_ENC_LINEAR_32 = 5, /* 32-bit linear PCM */ | |
| 108 AU_ENC_FLOAT = 6, /* 32-bit IEEE floating point */ | |
| 109 AU_ENC_DOUBLE = 7, /* 64-bit IEEE floating point */ | |
| 110 /* more Sun formats, not supported either */ | |
| 111 AU_ENC_ADPCM_G721 = 23, | |
| 112 AU_ENC_ADPCM_G722 = 24, | |
| 113 AU_ENC_ADPCM_G723_3 = 25, | |
| 114 AU_ENC_ADPCM_G723_5 = 26, | |
| 115 AU_ENC_ALAW_8 = 27 | |
| 116 }; | |
| 117 | |
| 118 struct audec | |
| 119 { | |
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120 Uint32 total; |
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121 Uint32 remaining; |
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122 Uint32 start_offset; |
| 213 | 123 int encoding; |
| 124 }; | |
| 125 | |
| 126 | |
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127 #define AU_MAGIC 0x2E736E64 /* ".snd", in ASCII (bigendian number) */ |
| 213 | 128 |
| 129 static int AU_open(Sound_Sample *sample, const char *ext) | |
| 130 { | |
| 131 Sound_SampleInternal *internal = sample->opaque; | |
| 132 SDL_RWops *rw = internal->rw; | |
| 133 int r, skip, hsize, i; | |
| 134 struct au_file_hdr hdr; | |
| 135 char c; | |
| 136 struct audec *dec = malloc(sizeof *dec); | |
| 137 BAIL_IF_MACRO(dec == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 138 internal->decoder_private = dec; | |
| 139 | |
| 140 r = SDL_RWread(rw, &hdr, 1, HDR_SIZE); | |
| 141 if (r < HDR_SIZE) | |
| 142 { | |
| 294 | 143 Sound_SetError("AU: Not an .au file (bad header)"); |
| 213 | 144 free(dec); |
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145 return(0); |
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146 } /* if */ |
| 213 | 147 |
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148 if (SDL_SwapBE32(hdr.magic) == AU_MAGIC) |
| 213 | 149 { |
| 150 /* valid magic */ | |
| 151 dec->encoding = SDL_SwapBE32(hdr.encoding); | |
| 152 switch(dec->encoding) | |
| 153 { | |
| 154 case AU_ENC_ULAW_8: | |
| 155 /* Convert 8-bit µ-law to 16-bit linear on the fly. This is | |
| 156 slightly wasteful if the audio driver must convert them | |
| 157 back, but µ-law only devices are rare (mostly _old_ Suns) */ | |
| 158 sample->actual.format = AUDIO_S16SYS; | |
| 159 break; | |
| 160 | |
| 161 case AU_ENC_LINEAR_8: | |
| 162 sample->actual.format = AUDIO_S8; | |
| 163 break; | |
| 164 | |
| 165 case AU_ENC_LINEAR_16: | |
| 166 sample->actual.format = AUDIO_S16MSB; | |
| 167 break; | |
| 168 | |
| 169 default: | |
| 294 | 170 Sound_SetError("AU: Unsupported .au encoding"); |
| 213 | 171 free(dec); |
| 172 return 0; | |
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173 } /* switch */ |
| 213 | 174 |
| 175 sample->actual.rate = SDL_SwapBE32(hdr.sample_rate); | |
| 176 sample->actual.channels = SDL_SwapBE32(hdr.channels); | |
| 177 dec->remaining = SDL_SwapBE32(hdr.data_size); | |
| 178 hsize = SDL_SwapBE32(hdr.hdr_size); | |
| 179 | |
| 180 /* skip remaining part of header (input may be unseekable) */ | |
| 181 for (i = HDR_SIZE; i < hsize; i++) | |
| 182 SDL_RWread(rw, &c, 1, 1); | |
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183 } /* if */ |
| 213 | 184 |
| 185 else if (__Sound_strcasecmp(ext, "au") == 0) | |
| 186 { | |
| 187 /* | |
| 188 * A number of files in the wild have the .au extension but no valid | |
| 189 * header; these are traditionally assumed to be 8kHz µ-law. Handle | |
| 190 * them here only if the extension is recognized. | |
| 191 */ | |
| 192 | |
| 193 SNDDBG(("AU: Invalid header, assuming raw 8kHz µ-law.\n")); | |
| 194 /* if seeking fails, we lose 24 samples. big deal */ | |
| 195 SDL_RWseek(rw, -HDR_SIZE, SEEK_CUR); | |
| 196 dec->encoding = AU_ENC_ULAW_8; | |
| 197 dec->remaining = (Uint32)-1; /* no limit */ | |
| 198 sample->actual.format = AUDIO_S16SYS; | |
| 199 sample->actual.rate = 8000; | |
| 200 sample->actual.channels = 1; | |
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201 } /* else if */ |
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202 |
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203 else |
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204 { |
| 294 | 205 Sound_SetError("AU: Not an .AU stream."); |
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206 free(dec); |
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207 return(0); |
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208 } /* else */ |
| 213 | 209 |
| 210 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
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211 dec->total = dec->remaining; |
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212 dec->start_offset = SDL_RWtell(rw); |
| 213 | 213 |
| 214 SNDDBG(("AU: Accepting data stream.\n")); | |
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215 return(1); |
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216 } /* AU_open */ |
| 213 | 217 |
| 218 | |
| 219 static void AU_close(Sound_Sample *sample) | |
| 220 { | |
| 221 Sound_SampleInternal *internal = sample->opaque; | |
| 222 free(internal->decoder_private); | |
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223 } /* AU_close */ |
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224 |
| 213 | 225 |
| 226 /* table to convert from µ-law encoding to signed 16-bit samples, | |
| 227 generated by a throwaway perl script */ | |
| 228 static Sint16 ulaw_to_linear[256] = { | |
| 229 -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956, | |
| 230 -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764, | |
| 231 -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412, | |
| 232 -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316, | |
| 233 -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140, | |
| 234 -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, | |
| 235 -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004, | |
| 236 -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980, | |
| 237 -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, | |
| 238 -1372, -1308, -1244, -1180, -1116, -1052, -988, -924, | |
| 239 -876, -844, -812, -780, -748, -716, -684, -652, | |
| 240 -620, -588, -556, -524, -492, -460, -428, -396, | |
| 241 -372, -356, -340, -324, -308, -292, -276, -260, | |
| 242 -244, -228, -212, -196, -180, -164, -148, -132, | |
| 243 -120, -112, -104, -96, -88, -80, -72, -64, | |
| 244 -56, -48, -40, -32, -24, -16, -8, 0, | |
| 245 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, | |
| 246 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, | |
| 247 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, | |
| 248 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, | |
| 249 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, | |
| 250 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, | |
| 251 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, | |
| 252 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, | |
| 253 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, | |
| 254 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, | |
| 255 876, 844, 812, 780, 748, 716, 684, 652, | |
| 256 620, 588, 556, 524, 492, 460, 428, 396, | |
| 257 372, 356, 340, 324, 308, 292, 276, 260, | |
| 258 244, 228, 212, 196, 180, 164, 148, 132, | |
| 259 120, 112, 104, 96, 88, 80, 72, 64, | |
| 260 56, 48, 40, 32, 24, 16, 8, 0 | |
| 261 }; | |
| 262 | |
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263 |
| 213 | 264 static Uint32 AU_read(Sound_Sample *sample) |
| 265 { | |
| 266 int ret; | |
| 267 Sound_SampleInternal *internal = sample->opaque; | |
| 268 struct audec *dec = internal->decoder_private; | |
| 269 int maxlen; | |
| 270 Uint8 *buf; | |
| 271 | |
| 272 maxlen = internal->buffer_size; | |
| 273 buf = internal->buffer; | |
| 274 if (dec->encoding == AU_ENC_ULAW_8) | |
| 275 { | |
| 276 /* We read µ-law samples into the second half of the buffer, so | |
| 277 we can expand them to 16-bit samples afterwards */ | |
| 278 maxlen >>= 1; | |
| 279 buf += maxlen; | |
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280 } /* if */ |
| 213 | 281 |
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282 if (maxlen > dec->remaining) |
| 213 | 283 maxlen = dec->remaining; |
| 284 ret = SDL_RWread(internal->rw, buf, 1, maxlen); | |
| 285 if (ret == 0) | |
| 286 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 287 else if (ret == -1) | |
| 288 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 289 else | |
| 290 { | |
| 291 dec->remaining -= ret; | |
| 292 if (ret < maxlen) | |
| 293 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 294 | |
| 295 if (dec->encoding == AU_ENC_ULAW_8) | |
| 296 { | |
| 297 int i; | |
| 298 Sint16 *dst = internal->buffer; | |
| 299 for (i = 0; i < ret; i++) | |
| 300 dst[i] = ulaw_to_linear[buf[i]]; | |
| 301 ret <<= 1; /* return twice as much as read */ | |
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302 } /* if */ |
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303 } /* else */ |
| 213 | 304 |
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305 return(ret); |
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306 } /* AU_read */ |
| 213 | 307 |
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308 |
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309 static int AU_rewind(Sound_Sample *sample) |
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310 { |
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311 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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312 struct audec *dec = (struct audec *) internal->decoder_private; |
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313 int rc = SDL_RWseek(internal->rw, dec->start_offset, SEEK_SET); |
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314 BAIL_IF_MACRO(rc != dec->start_offset, ERR_IO_ERROR, 0); |
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315 dec->remaining = dec->total; |
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316 return(1); |
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317 } /* AU_rewind */ |
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318 |
| 213 | 319 #endif /* SOUND_SUPPORTS_AU */ |
| 320 |