Mercurial > SDL_sound_CoreAudio
annotate decoders/au.c @ 331:e683cb99f88f
Fixed seek implementation.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 20 May 2002 09:40:59 +0000 |
| parents | a81976ed5df7 |
| children | cbb15ecf423a |
| 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); |
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52 static int AU_seek(Sound_Sample *sample, Uint32 ms); |
| 213 | 53 |
| 54 /* | |
| 55 * Sometimes the extension ".snd" is used for these files (mostly on the NeXT), | |
| 56 * and the magic number comes from this. However it may clash with other | |
| 57 * formats and is somewhat of an anachronism, so only .au is used here. | |
| 58 */ | |
| 59 static const char *extensions_au[] = { "AU", NULL }; | |
| 60 const Sound_DecoderFunctions __Sound_DecoderFunctions_AU = | |
| 61 { | |
| 62 { | |
| 63 extensions_au, | |
| 64 "Sun/NeXT audio file format", | |
| 65 "Mattias Engdegård <f91-men@nada.kth.se>", | |
| 66 "http://www.icculus.org/SDL_sound/" | |
| 67 }, | |
| 68 | |
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69 AU_init, /* init() method */ |
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70 AU_quit, /* quit() method */ |
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71 AU_open, /* open() method */ |
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72 AU_close, /* close() method */ |
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73 AU_read, /* read() method */ |
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74 AU_rewind, /* rewind() method */ |
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75 AU_seek /* seek() method */ |
| 213 | 76 }; |
| 77 | |
| 78 /* no init/deinit needed */ | |
| 79 static int AU_init(void) | |
| 80 { | |
| 81 return(1); | |
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82 } /* AU_init */ |
| 213 | 83 |
| 84 static void AU_quit(void) | |
| 85 { | |
| 86 /* no-op. */ | |
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87 } /* AU_quit */ |
| 213 | 88 |
| 89 struct au_file_hdr | |
| 90 { | |
| 91 Uint32 magic; | |
| 92 Uint32 hdr_size; | |
| 93 Uint32 data_size; | |
| 94 Uint32 encoding; | |
| 95 Uint32 sample_rate; | |
| 96 Uint32 channels; | |
| 97 }; | |
| 98 | |
| 99 #define HDR_SIZE 24 | |
| 100 | |
| 101 enum | |
| 102 { | |
| 103 AU_ENC_ULAW_8 = 1, /* 8-bit ISDN µ-law */ | |
| 104 AU_ENC_LINEAR_8 = 2, /* 8-bit linear PCM */ | |
| 105 AU_ENC_LINEAR_16 = 3, /* 16-bit linear PCM */ | |
| 106 | |
| 107 /* the rest are unsupported (I have never seen them in the wild) */ | |
| 108 AU_ENC_LINEAR_24 = 4, /* 24-bit linear PCM */ | |
| 109 AU_ENC_LINEAR_32 = 5, /* 32-bit linear PCM */ | |
| 110 AU_ENC_FLOAT = 6, /* 32-bit IEEE floating point */ | |
| 111 AU_ENC_DOUBLE = 7, /* 64-bit IEEE floating point */ | |
| 112 /* more Sun formats, not supported either */ | |
| 113 AU_ENC_ADPCM_G721 = 23, | |
| 114 AU_ENC_ADPCM_G722 = 24, | |
| 115 AU_ENC_ADPCM_G723_3 = 25, | |
| 116 AU_ENC_ADPCM_G723_5 = 26, | |
| 117 AU_ENC_ALAW_8 = 27 | |
| 118 }; | |
| 119 | |
| 120 struct audec | |
| 121 { | |
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122 Uint32 total; |
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123 Uint32 remaining; |
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124 Uint32 start_offset; |
| 213 | 125 int encoding; |
| 126 }; | |
| 127 | |
| 128 | |
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129 /* |
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130 * Read in the AU header from disk. This makes this process safe |
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131 * regardless of the processor's byte order or how the au_file_hdr |
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132 * structure is packed. |
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133 */ |
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134 static int read_au_header(SDL_RWops *rw, struct au_file_hdr *hdr) |
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135 { |
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136 if (SDL_RWread(rw, &hdr->magic, sizeof (hdr->magic), 1) != 1) |
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137 return(0); |
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138 hdr->magic = SDL_SwapBE32(hdr->magic); |
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139 |
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140 if (SDL_RWread(rw, &hdr->hdr_size, sizeof (hdr->hdr_size), 1) != 1) |
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141 return(0); |
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142 hdr->hdr_size = SDL_SwapBE32(hdr->hdr_size); |
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143 |
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144 if (SDL_RWread(rw, &hdr->data_size, sizeof (hdr->data_size), 1) != 1) |
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145 return(0); |
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146 hdr->data_size = SDL_SwapBE32(hdr->data_size); |
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147 |
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148 if (SDL_RWread(rw, &hdr->encoding, sizeof (hdr->encoding), 1) != 1) |
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149 return(0); |
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150 hdr->encoding = SDL_SwapBE32(hdr->encoding); |
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151 |
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152 if (SDL_RWread(rw, &hdr->sample_rate, sizeof (hdr->sample_rate), 1) != 1) |
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153 return(0); |
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154 hdr->sample_rate = SDL_SwapBE32(hdr->sample_rate); |
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155 |
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156 if (SDL_RWread(rw, &hdr->channels, sizeof (hdr->channels), 1) != 1) |
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157 return(0); |
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158 hdr->channels = SDL_SwapBE32(hdr->channels); |
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159 |
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160 return(1); |
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161 } /* read_au_header */ |
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162 |
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163 |
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164 #define AU_MAGIC 0x2E736E64 /* ".snd", in ASCII (bigendian number) */ |
| 213 | 165 |
| 166 static int AU_open(Sound_Sample *sample, const char *ext) | |
| 167 { | |
| 168 Sound_SampleInternal *internal = sample->opaque; | |
| 169 SDL_RWops *rw = internal->rw; | |
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170 int skip, hsize, i; |
| 213 | 171 struct au_file_hdr hdr; |
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172 struct audec *dec; |
| 213 | 173 char c; |
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174 |
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175 if (!read_au_header(rw, &hdr)) /* does byte order swapping. */ |
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176 { |
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177 Sound_SetError("AU: Not an .au file (bad header)"); |
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178 return(0); |
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179 } /* if */ |
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180 |
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181 dec = malloc(sizeof *dec); |
| 213 | 182 BAIL_IF_MACRO(dec == NULL, ERR_OUT_OF_MEMORY, 0); |
| 183 internal->decoder_private = dec; | |
| 184 | |
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185 if (hdr.magic == AU_MAGIC) |
| 213 | 186 { |
| 187 /* valid magic */ | |
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188 dec->encoding = hdr.encoding; |
| 213 | 189 switch(dec->encoding) |
| 190 { | |
| 191 case AU_ENC_ULAW_8: | |
| 192 /* Convert 8-bit µ-law to 16-bit linear on the fly. This is | |
| 193 slightly wasteful if the audio driver must convert them | |
| 194 back, but µ-law only devices are rare (mostly _old_ Suns) */ | |
| 195 sample->actual.format = AUDIO_S16SYS; | |
| 196 break; | |
| 197 | |
| 198 case AU_ENC_LINEAR_8: | |
| 199 sample->actual.format = AUDIO_S8; | |
| 200 break; | |
| 201 | |
| 202 case AU_ENC_LINEAR_16: | |
| 203 sample->actual.format = AUDIO_S16MSB; | |
| 204 break; | |
| 205 | |
| 206 default: | |
| 294 | 207 Sound_SetError("AU: Unsupported .au encoding"); |
| 213 | 208 free(dec); |
| 209 return 0; | |
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210 } /* switch */ |
| 213 | 211 |
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212 sample->actual.rate = hdr.sample_rate; |
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213 sample->actual.channels = hdr.channels; |
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214 dec->remaining = hdr.data_size; |
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215 hsize = hdr.hdr_size; |
| 213 | 216 |
| 217 /* skip remaining part of header (input may be unseekable) */ | |
| 218 for (i = HDR_SIZE; i < hsize; i++) | |
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219 { |
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220 if (SDL_RWread(rw, &c, 1, 1) != 1) |
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221 { |
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222 free(dec); |
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223 BAIL_MACRO(ERR_IO_ERROR, 0); |
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224 } /* if */ |
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225 } /* for */ |
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226 } /* if */ |
| 213 | 227 |
| 228 else if (__Sound_strcasecmp(ext, "au") == 0) | |
| 229 { | |
| 230 /* | |
| 231 * A number of files in the wild have the .au extension but no valid | |
| 232 * header; these are traditionally assumed to be 8kHz µ-law. Handle | |
| 233 * them here only if the extension is recognized. | |
| 234 */ | |
| 235 | |
| 236 SNDDBG(("AU: Invalid header, assuming raw 8kHz µ-law.\n")); | |
| 237 /* if seeking fails, we lose 24 samples. big deal */ | |
| 238 SDL_RWseek(rw, -HDR_SIZE, SEEK_CUR); | |
| 239 dec->encoding = AU_ENC_ULAW_8; | |
| 240 dec->remaining = (Uint32)-1; /* no limit */ | |
| 241 sample->actual.format = AUDIO_S16SYS; | |
| 242 sample->actual.rate = 8000; | |
| 243 sample->actual.channels = 1; | |
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244 } /* else if */ |
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245 |
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246 else |
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247 { |
| 294 | 248 Sound_SetError("AU: Not an .AU stream."); |
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249 free(dec); |
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250 return(0); |
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251 } /* else */ |
| 213 | 252 |
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253 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
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254 dec->total = dec->remaining; |
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255 dec->start_offset = SDL_RWtell(rw); |
| 213 | 256 |
| 257 SNDDBG(("AU: Accepting data stream.\n")); | |
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258 return(1); |
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259 } /* AU_open */ |
| 213 | 260 |
| 261 | |
| 262 static void AU_close(Sound_Sample *sample) | |
| 263 { | |
| 264 Sound_SampleInternal *internal = sample->opaque; | |
| 265 free(internal->decoder_private); | |
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266 } /* AU_close */ |
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267 |
| 213 | 268 |
| 269 /* table to convert from µ-law encoding to signed 16-bit samples, | |
| 270 generated by a throwaway perl script */ | |
| 271 static Sint16 ulaw_to_linear[256] = { | |
| 272 -32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956, | |
| 273 -23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764, | |
| 274 -15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412, | |
| 275 -11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316, | |
| 276 -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140, | |
| 277 -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, | |
| 278 -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004, | |
| 279 -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980, | |
| 280 -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, | |
| 281 -1372, -1308, -1244, -1180, -1116, -1052, -988, -924, | |
| 282 -876, -844, -812, -780, -748, -716, -684, -652, | |
| 283 -620, -588, -556, -524, -492, -460, -428, -396, | |
| 284 -372, -356, -340, -324, -308, -292, -276, -260, | |
| 285 -244, -228, -212, -196, -180, -164, -148, -132, | |
| 286 -120, -112, -104, -96, -88, -80, -72, -64, | |
| 287 -56, -48, -40, -32, -24, -16, -8, 0, | |
| 288 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, | |
| 289 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, | |
| 290 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, | |
| 291 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, | |
| 292 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, | |
| 293 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, | |
| 294 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, | |
| 295 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, | |
| 296 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, | |
| 297 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, | |
| 298 876, 844, 812, 780, 748, 716, 684, 652, | |
| 299 620, 588, 556, 524, 492, 460, 428, 396, | |
| 300 372, 356, 340, 324, 308, 292, 276, 260, | |
| 301 244, 228, 212, 196, 180, 164, 148, 132, | |
| 302 120, 112, 104, 96, 88, 80, 72, 64, | |
| 303 56, 48, 40, 32, 24, 16, 8, 0 | |
| 304 }; | |
| 305 | |
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306 |
| 213 | 307 static Uint32 AU_read(Sound_Sample *sample) |
| 308 { | |
| 309 int ret; | |
| 310 Sound_SampleInternal *internal = sample->opaque; | |
| 311 struct audec *dec = internal->decoder_private; | |
| 312 int maxlen; | |
| 313 Uint8 *buf; | |
| 314 | |
| 315 maxlen = internal->buffer_size; | |
| 316 buf = internal->buffer; | |
| 317 if (dec->encoding == AU_ENC_ULAW_8) | |
| 318 { | |
| 319 /* We read µ-law samples into the second half of the buffer, so | |
| 320 we can expand them to 16-bit samples afterwards */ | |
| 321 maxlen >>= 1; | |
| 322 buf += maxlen; | |
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323 } /* if */ |
| 213 | 324 |
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325 if (maxlen > dec->remaining) |
| 213 | 326 maxlen = dec->remaining; |
| 327 ret = SDL_RWread(internal->rw, buf, 1, maxlen); | |
| 328 if (ret == 0) | |
| 329 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 330 else if (ret == -1) | |
| 331 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 332 else | |
| 333 { | |
| 334 dec->remaining -= ret; | |
| 335 if (ret < maxlen) | |
| 336 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 337 | |
| 338 if (dec->encoding == AU_ENC_ULAW_8) | |
| 339 { | |
| 340 int i; | |
| 341 Sint16 *dst = internal->buffer; | |
| 342 for (i = 0; i < ret; i++) | |
| 343 dst[i] = ulaw_to_linear[buf[i]]; | |
| 344 ret <<= 1; /* return twice as much as read */ | |
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345 } /* if */ |
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346 } /* else */ |
| 213 | 347 |
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348 return(ret); |
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349 } /* AU_read */ |
| 213 | 350 |
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351 |
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352 static int AU_rewind(Sound_Sample *sample) |
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353 { |
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354 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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355 struct audec *dec = (struct audec *) internal->decoder_private; |
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356 int rc = SDL_RWseek(internal->rw, dec->start_offset, SEEK_SET); |
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357 BAIL_IF_MACRO(rc != dec->start_offset, ERR_IO_ERROR, 0); |
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358 dec->remaining = dec->total; |
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359 return(1); |
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360 } /* AU_rewind */ |
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361 |
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362 |
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363 static int AU_seek(Sound_Sample *sample, Uint32 ms) |
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364 { |
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365 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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366 struct audec *dec = (struct audec *) internal->decoder_private; |
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367 int offset = __Sound_convertMsToBytePos(&sample->actual, ms); |
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368 int rc; |
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369 int pos; |
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370 |
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371 if (dec->encoding == AU_ENC_ULAW_8) |
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372 offset >>= 1; /* halve the byte offset for compression. */ |
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373 |
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374 pos = (int) (dec->start_offset + offset); |
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375 rc = SDL_RWseek(internal->rw, pos, SEEK_SET); |
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376 BAIL_IF_MACRO(rc != pos, ERR_IO_ERROR, 0); |
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377 dec->remaining = dec->total - offset; |
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378 return(1); |
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379 } /* AU_seek */ |
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380 |
| 213 | 381 #endif /* SOUND_SUPPORTS_AU */ |
| 382 |