Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 184:47cc2de2ae36
Changed reference to "LICENSE" file to "COPYING".
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Wed, 26 Dec 2001 10:40:25 +0000 |
| parents | 3849438b735e |
| children | c9772a9f5271 |
| rev | line source |
|---|---|
| 155 | 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 * FLAC decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles FLAC audio, that is to say the Free Lossless Audio | |
| 24 * Codec. It depends on libFLAC for decoding, which can be grabbed from: | |
| 25 * http://flac.sourceforge.net | |
| 26 * | |
|
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27 * Please see the file COPYING in the source's root directory. |
| 155 | 28 * |
| 29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) | |
| 30 */ | |
| 31 | |
| 32 #if HAVE_CONFIG_H | |
| 33 # include <config.h> | |
| 34 #endif | |
| 35 | |
| 36 #ifdef SOUND_SUPPORTS_FLAC | |
| 37 | |
| 38 #include <stdio.h> | |
| 39 #include <stdlib.h> | |
| 40 #include <string.h> | |
| 41 #include <assert.h> | |
| 42 | |
| 43 #include "SDL_sound.h" | |
| 44 | |
| 45 #define __SDL_SOUND_INTERNAL__ | |
| 46 #include "SDL_sound_internal.h" | |
| 47 | |
|
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48 #include "FLAC/stream_decoder.h" |
| 155 | 49 |
| 50 | |
| 51 static int FLAC_init(void); | |
| 52 static void FLAC_quit(void); | |
| 53 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
| 54 static void FLAC_close(Sound_Sample *sample); | |
| 55 static Uint32 FLAC_read(Sound_Sample *sample); | |
| 56 | |
| 57 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
| 58 | |
| 59 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
| 60 { | |
| 61 { | |
| 62 extensions_flac, | |
| 63 "Free Lossless Audio Codec", | |
| 64 "Torbjörn Andersson <d91tan@Update.UU.SE>", | |
| 65 "http://flac.sourceforge.net/" | |
| 66 }, | |
| 67 | |
| 68 FLAC_init, /* init() method */ | |
| 69 FLAC_quit, /* quit() method */ | |
| 70 FLAC_open, /* open() method */ | |
| 71 FLAC_close, /* close() method */ | |
| 72 FLAC_read /* read() method */ | |
| 73 }; | |
| 74 | |
| 75 /* This is what we store in our internal->decoder_private field. */ | |
| 76 typedef struct | |
| 77 { | |
| 78 FLAC__StreamDecoder *decoder; | |
| 79 SDL_RWops *rw; | |
| 80 Sound_Sample *sample; | |
| 81 Uint32 frame_size; | |
|
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82 Uint8 is_flac; |
| 155 | 83 } flac_t; |
| 84 | |
| 85 | |
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86 static void free_flac(flac_t *f) |
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87 { |
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88 FLAC__stream_decoder_finish(f->decoder); |
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89 FLAC__stream_decoder_delete(f->decoder); |
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90 free(f); |
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91 } /* free_flac */ |
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92 |
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93 |
| 155 | 94 static FLAC__StreamDecoderReadStatus FLAC_read_callback( |
| 95 const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], | |
| 96 unsigned int *bytes, void *client_data) | |
| 97 { | |
| 98 flac_t *f = (flac_t *) client_data; | |
| 99 Uint32 retval; | |
| 100 | |
| 101 #if 0 | |
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102 SNDDBG(("FLAC: Read callback.\n")); |
| 155 | 103 #endif |
| 104 | |
| 105 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 106 | |
| 107 if (retval == 0) | |
| 108 { | |
| 109 *bytes = 0; | |
| 110 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 111 return(FLAC__STREAM_DECODER_READ_END_OF_STREAM); | |
| 112 } /* if */ | |
| 113 | |
| 114 if (retval == -1) | |
| 115 { | |
| 116 *bytes = 0; | |
| 117 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 118 return(FLAC__STREAM_DECODER_READ_ABORT); | |
| 119 } /* if */ | |
| 120 | |
| 121 if (retval < *bytes) | |
| 122 { | |
| 123 *bytes = retval; | |
| 124 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 125 } /* if */ | |
| 126 | |
| 127 return(FLAC__STREAM_DECODER_READ_CONTINUE); | |
| 128 } /* FLAC_read_callback */ | |
| 129 | |
| 130 | |
| 131 static FLAC__StreamDecoderWriteStatus FLAC_write_callback( | |
| 132 const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, | |
| 133 const FLAC__int32 *buffer[], void *client_data) | |
| 134 { | |
| 135 flac_t *f = (flac_t *) client_data; | |
| 136 Uint32 i, j; | |
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137 Uint32 sample; |
| 155 | 138 Uint8 *dst; |
| 139 | |
| 140 #if 0 | |
| 141 SNDDBG(("FLAC: Write callback.\n")); | |
| 142 #endif | |
| 143 | |
| 144 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 145 * frame->header.bits_per_sample / 8; | |
| 146 | |
| 147 if (f->frame_size > f->sample->buffer_size) | |
| 148 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 149 | |
| 150 dst = f->sample->buffer; | |
| 151 | |
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152 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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153 * be converted. Unfortunately the buffer is read-only, so we either |
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154 * have to check for each sample, or make a copy of the buffer. I'm |
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155 * not sure which way is best, so I've arbitrarily picked the former. |
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156 */ |
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157 if (f->sample->actual.format == AUDIO_S8) |
| 155 | 158 { |
| 159 for (i = 0; i < frame->header.blocksize; i++) | |
| 160 for (j = 0; j < frame->header.channels; j++) | |
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161 { |
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162 sample = buffer[j][i]; |
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163 if (frame->header.bits_per_sample < 8) |
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164 sample <<= (8 - frame->header.bits_per_sample); |
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165 *dst++ = sample & 0x00ff; |
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166 } /* for */ |
| 155 | 167 } /* if */ |
| 168 else | |
| 169 { | |
| 170 for (i = 0; i < frame->header.blocksize; i++) | |
| 171 for (j = 0; j < frame->header.channels; j++) | |
| 172 { | |
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173 sample = buffer[j][i]; |
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174 if (frame->header.bits_per_sample < 16) |
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175 sample <<= (16 - frame->header.bits_per_sample); |
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176 else if (frame->header.bits_per_sample > 16) |
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177 sample >>= (frame->header.bits_per_sample - 16); |
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178 *dst++ = (sample & 0xff00) >> 8; |
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179 *dst++ = sample & 0x00ff; |
| 155 | 180 } /* for */ |
| 181 } /* else */ | |
| 182 | |
| 183 return(FLAC__STREAM_DECODER_WRITE_CONTINUE); | |
| 184 } /* FLAC_write_callback */ | |
| 185 | |
| 186 | |
| 187 void FLAC_metadata_callback( | |
| 188 const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, | |
| 189 void *client_data) | |
| 190 { | |
| 191 flac_t *f = (flac_t *) client_data; | |
| 192 | |
| 193 SNDDBG(("FLAC: Metadata callback.\n")); | |
| 194 | |
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195 /* There are several kinds of metadata, but STREAMINFO is the only |
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196 * one that always has to be there. |
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197 */ |
| 155 | 198 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 199 { | |
| 200 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
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201 |
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202 f->is_flac = 1; |
| 155 | 203 f->sample->actual.channels = metadata->data.stream_info.channels; |
| 204 f->sample->actual.rate = metadata->data.stream_info.sample_rate; | |
| 205 | |
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206 if (metadata->data.stream_info.bits_per_sample > 8) |
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207 f->sample->actual.format = AUDIO_S16MSB; |
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208 else |
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209 f->sample->actual.format = AUDIO_S8; |
| 155 | 210 } /* if */ |
| 211 } /* FLAC_metadata_callback */ | |
| 212 | |
| 213 | |
| 214 void FLAC_error_callback( | |
| 215 const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, | |
| 216 void *client_data) | |
| 217 { | |
| 218 flac_t *f = (flac_t *) client_data; | |
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219 |
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220 /* !!! FIXME: Is every error really fatal? I don't know... */ |
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221 Sound_SetError(FLAC__StreamDecoderErrorStatusString[status]); |
| 155 | 222 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 223 } /* FLAC_error_callback */ | |
| 224 | |
| 225 | |
| 226 static int FLAC_init(void) | |
| 227 { | |
| 228 return(1); /* always succeeds. */ | |
| 229 } /* FLAC_init */ | |
| 230 | |
| 231 | |
| 232 static void FLAC_quit(void) | |
| 233 { | |
| 234 /* it's a no-op. */ | |
| 235 } /* FLAC_quit */ | |
| 236 | |
| 237 | |
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238 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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239 |
| 155 | 240 static int FLAC_open(Sound_Sample *sample, const char *ext) |
| 241 { | |
| 242 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 243 SDL_RWops *rw = internal->rw; | |
| 244 FLAC__StreamDecoder *decoder; | |
| 245 flac_t *f; | |
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246 int i; |
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247 int has_extension = 0; |
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248 |
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249 /* |
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250 * If the extension is "flac", we'll believe that this is really meant |
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251 * to be a FLAC stream, and will try to grok it from existing metadata. |
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252 * metadata searching can be a very expensive operation, however, so |
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253 * unless the user swears that it is a FLAC stream through the extension, |
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254 * we decide what to do based on the existance of a 32-bit magic number. |
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255 */ |
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256 for (i = 0; extensions_flac[i] != NULL; i++) |
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257 { |
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258 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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259 { |
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260 has_extension = 1; |
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261 break; |
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262 } /* if */ |
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263 } /* for */ |
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264 |
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265 if (!has_extension) |
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266 { |
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267 int rc; |
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268 Uint32 flac_magic = SDL_ReadLE32(rw); |
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269 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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270 |
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271 /* move back over magic number for metadata scan... */ |
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272 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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273 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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274 } /* if */ |
| 155 | 275 |
| 276 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 277 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 278 | |
| 279 decoder = FLAC__stream_decoder_new(); | |
| 280 if (decoder == NULL) | |
| 281 { | |
| 282 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 283 free(f); | |
| 284 return(0); | |
| 285 } /* if */ | |
| 286 | |
| 287 FLAC__stream_decoder_set_read_callback(decoder, FLAC_read_callback); | |
| 288 FLAC__stream_decoder_set_write_callback(decoder, FLAC_write_callback); | |
| 289 FLAC__stream_decoder_set_metadata_callback(decoder, FLAC_metadata_callback); | |
| 290 FLAC__stream_decoder_set_error_callback(decoder, FLAC_error_callback); | |
| 291 FLAC__stream_decoder_set_client_data(decoder, f); | |
| 292 | |
| 293 f->rw = internal->rw; | |
| 294 f->sample = sample; | |
| 295 f->decoder = decoder; | |
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296 f->sample->actual.format = 0; |
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297 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
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298 |
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299 internal->decoder_private = f; |
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300 FLAC__stream_decoder_init(decoder); |
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301 |
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302 /* |
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303 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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304 * metadata block. If not, we'd have to peek at the first audio frame |
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305 * and get the sound format from there, but that is not yet |
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306 * implemented. |
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307 */ |
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308 if (!f->is_flac) |
| 155 | 309 { |
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310 FLAC__stream_decoder_process_metadata(decoder); |
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311 |
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312 /* Still not FLAC? Give up. */ |
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313 if (!f->is_flac) |
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314 { |
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315 Sound_SetError("FLAC: No metadata found. Not a FLAC stream?"); |
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316 free_flac(f); |
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317 return(0); |
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318 } /* if */ |
| 155 | 319 } /* if */ |
| 320 | |
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321 SNDDBG(("FLAC: Accepting data stream.\n")); |
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322 |
| 155 | 323 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 324 return(1); | |
| 325 } /* FLAC_open */ | |
| 326 | |
| 327 | |
| 328 static void FLAC_close(Sound_Sample *sample) | |
| 329 { | |
| 330 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 331 flac_t *f = (flac_t *) internal->decoder_private; | |
| 332 | |
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333 free_flac(f); |
| 155 | 334 } /* FLAC_close */ |
| 335 | |
| 336 | |
| 337 static Uint32 FLAC_read(Sound_Sample *sample) | |
| 338 { | |
| 339 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 340 flac_t *f = (flac_t *) internal->decoder_private; | |
| 341 Uint32 len; | |
| 342 | |
| 343 if (FLAC__stream_decoder_get_state(f->decoder) == FLAC__STREAM_DECODER_END_OF_STREAM) | |
| 344 { | |
| 345 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 346 return(0); | |
| 347 } /* if */ | |
| 348 | |
| 349 if (!FLAC__stream_decoder_process_one_frame(f->decoder)) | |
| 350 { | |
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351 Sound_SetError("FLAC: Couldn't decode frame."); |
| 155 | 352 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 353 return(0); | |
| 354 } /* if */ | |
| 355 | |
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356 /* An error may have been signalled through the error callback. */ |
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357 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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358 return(0); |
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359 |
| 155 | 360 return(f->frame_size); |
| 361 } /* FLAC_read */ | |
| 362 | |
| 363 #endif /* SOUND_SUPPORTS_FLAC */ | |
| 364 | |
| 365 | |
| 366 /* end of flac.c ... */ |