Mercurial > SDL_sound_CoreAudio
annotate decoders/au.c @ 305:c345a40a8a99
VERY preliminary work on Sound_Seek() API.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Sun, 21 Apr 2002 17:48:11 +0000 |
parents | 9828311da44b |
children | c97be6e1bd27 |
rev | line source |
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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 |
257
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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 |