Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 164:77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
stream handling; uses metadata check to see if stream is valid instead of
magic number.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 19 Nov 2001 16:39:42 +0000 |
| parents | 72ff7d3a25b6 |
| children | d8904267d23c |
| 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 * | |
| 27 * Please see the file LICENSE in the source's root directory. | |
| 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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77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
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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Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
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parents:
155
diff
changeset
|
82 Uint8 metadata_found; |
| 155 | 83 } flac_t; |
| 84 | |
| 85 | |
| 86 static FLAC__StreamDecoderReadStatus FLAC_read_callback( | |
| 87 const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], | |
| 88 unsigned int *bytes, void *client_data) | |
| 89 { | |
| 90 flac_t *f = (flac_t *) client_data; | |
| 91 Uint32 retval; | |
| 92 | |
| 93 #if 0 | |
|
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Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
94 SNDDBG(("FLAC: Read callback.\n")); |
| 155 | 95 #endif |
| 96 | |
| 97 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 98 | |
| 99 if (retval == 0) | |
| 100 { | |
| 101 *bytes = 0; | |
| 102 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 103 return(FLAC__STREAM_DECODER_READ_END_OF_STREAM); | |
| 104 } /* if */ | |
| 105 | |
| 106 if (retval == -1) | |
| 107 { | |
| 108 *bytes = 0; | |
| 109 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 110 return(FLAC__STREAM_DECODER_READ_ABORT); | |
| 111 } /* if */ | |
| 112 | |
| 113 if (retval < *bytes) | |
| 114 { | |
| 115 *bytes = retval; | |
| 116 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 117 } /* if */ | |
| 118 | |
| 119 return(FLAC__STREAM_DECODER_READ_CONTINUE); | |
| 120 } /* FLAC_read_callback */ | |
| 121 | |
| 122 | |
| 123 static FLAC__StreamDecoderWriteStatus FLAC_write_callback( | |
| 124 const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, | |
| 125 const FLAC__int32 *buffer[], void *client_data) | |
| 126 { | |
| 127 flac_t *f = (flac_t *) client_data; | |
| 128 Uint32 i, j; | |
| 129 Uint8 *dst; | |
| 130 | |
| 131 #if 0 | |
| 132 SNDDBG(("FLAC: Write callback.\n")); | |
| 133 #endif | |
| 134 | |
| 135 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 136 * frame->header.bits_per_sample / 8; | |
| 137 | |
| 138 if (f->frame_size > f->sample->buffer_size) | |
| 139 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 140 | |
| 141 dst = f->sample->buffer; | |
| 142 | |
| 143 if (frame->header.bits_per_sample == 8) | |
| 144 { | |
| 145 for (i = 0; i < frame->header.blocksize; i++) | |
| 146 for (j = 0; j < frame->header.channels; j++) | |
| 147 *dst++ = buffer[j][i] & 0x000000ff; | |
| 148 } /* if */ | |
| 149 else | |
| 150 { | |
| 151 for (i = 0; i < frame->header.blocksize; i++) | |
| 152 for (j = 0; j < frame->header.channels; j++) | |
| 153 { | |
| 154 *dst++ = (buffer[j][i] & 0x0000ff00) >> 8; | |
| 155 *dst++ = buffer[j][i] & 0x000000ff; | |
| 156 } /* for */ | |
| 157 } /* else */ | |
| 158 | |
| 159 return(FLAC__STREAM_DECODER_WRITE_CONTINUE); | |
| 160 } /* FLAC_write_callback */ | |
| 161 | |
| 162 | |
| 163 void FLAC_metadata_callback( | |
| 164 const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, | |
| 165 void *client_data) | |
| 166 { | |
| 167 flac_t *f = (flac_t *) client_data; | |
| 168 | |
| 169 SNDDBG(("FLAC: Metadata callback.\n")); | |
| 170 | |
| 171 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) | |
| 172 { | |
| 173 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
|
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77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
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parents:
155
diff
changeset
|
174 f->metadata_found = 1; |
| 155 | 175 f->sample->actual.channels = metadata->data.stream_info.channels; |
| 176 f->sample->actual.rate = metadata->data.stream_info.sample_rate; | |
| 177 | |
| 178 /* !!! FIXME: I believe bits_per_sample may be anywhere between | |
| 179 * 4 and 24. We can only handle 8 and 16 at present. | |
| 180 */ | |
| 181 switch (metadata->data.stream_info.bits_per_sample) | |
| 182 { | |
| 183 case 8: | |
| 184 f->sample->actual.format = AUDIO_S8; | |
| 185 break; | |
| 186 case 16: | |
| 187 f->sample->actual.format = AUDIO_S16MSB; | |
| 188 break; | |
| 189 default: | |
|
164
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
190 Sound_SetError("FLAC: Unsupported sample width."); |
| 155 | 191 f->sample->actual.format = 0; |
| 192 break; | |
| 193 } /* switch */ | |
| 194 } /* if */ | |
| 195 } /* FLAC_metadata_callback */ | |
| 196 | |
| 197 | |
| 198 void FLAC_error_callback( | |
| 199 const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, | |
| 200 void *client_data) | |
| 201 { | |
| 202 flac_t *f = (flac_t *) client_data; | |
|
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Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
203 |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
204 Sound_SetError(FLAC__StreamDecoderErrorStatusString[status]); |
| 155 | 205 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 206 } /* FLAC_error_callback */ | |
| 207 | |
| 208 | |
| 209 static int FLAC_init(void) | |
| 210 { | |
| 211 return(1); /* always succeeds. */ | |
| 212 } /* FLAC_init */ | |
| 213 | |
| 214 | |
| 215 static void FLAC_quit(void) | |
| 216 { | |
| 217 /* it's a no-op. */ | |
| 218 } /* FLAC_quit */ | |
| 219 | |
| 220 | |
| 221 static int FLAC_open(Sound_Sample *sample, const char *ext) | |
| 222 { | |
| 223 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 224 SDL_RWops *rw = internal->rw; | |
| 225 FLAC__StreamDecoder *decoder; | |
| 226 flac_t *f; | |
| 227 | |
| 228 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 229 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 230 | |
| 231 decoder = FLAC__stream_decoder_new(); | |
| 232 if (decoder == NULL) | |
| 233 { | |
| 234 Sound_SetError(ERR_OUT_OF_MEMORY); | |
| 235 free(f); | |
| 236 return(0); | |
| 237 } /* if */ | |
| 238 | |
| 239 FLAC__stream_decoder_set_read_callback(decoder, FLAC_read_callback); | |
| 240 FLAC__stream_decoder_set_write_callback(decoder, FLAC_write_callback); | |
| 241 FLAC__stream_decoder_set_metadata_callback(decoder, FLAC_metadata_callback); | |
| 242 FLAC__stream_decoder_set_error_callback(decoder, FLAC_error_callback); | |
| 243 FLAC__stream_decoder_set_client_data(decoder, f); | |
| 244 | |
| 245 f->rw = internal->rw; | |
| 246 f->sample = sample; | |
| 247 f->decoder = decoder; | |
| 248 | |
| 249 FLAC__stream_decoder_init(decoder); | |
| 250 internal->decoder_private = f; | |
| 251 | |
|
164
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
252 f->metadata_found = 0; |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
253 f->sample->actual.format = 0; |
| 155 | 254 FLAC__stream_decoder_process_metadata(decoder); |
| 255 | |
| 256 if (f->sample->actual.format == 0) | |
| 257 { | |
|
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Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
258 if (f->metadata_found == 0) |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
259 Sound_SetError("FLAC: No metadata found."); |
| 155 | 260 FLAC__stream_decoder_finish(decoder); |
| 261 FLAC__stream_decoder_delete(decoder); | |
| 262 free(f); | |
| 263 return(0); | |
| 264 } /* if */ | |
| 265 | |
|
164
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
266 SNDDBG(("FLAC: Accepting data stream.\n")); |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
267 |
| 155 | 268 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 269 return(1); | |
| 270 } /* FLAC_open */ | |
| 271 | |
| 272 | |
| 273 static void FLAC_close(Sound_Sample *sample) | |
| 274 { | |
| 275 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 276 flac_t *f = (flac_t *) internal->decoder_private; | |
| 277 | |
| 278 FLAC__stream_decoder_finish(f->decoder); | |
| 279 FLAC__stream_decoder_delete(f->decoder); | |
| 280 free(f); | |
| 281 } /* FLAC_close */ | |
| 282 | |
| 283 | |
| 284 static Uint32 FLAC_read(Sound_Sample *sample) | |
| 285 { | |
| 286 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 287 flac_t *f = (flac_t *) internal->decoder_private; | |
| 288 Uint32 len; | |
| 289 | |
| 290 if (FLAC__stream_decoder_get_state(f->decoder) == FLAC__STREAM_DECODER_END_OF_STREAM) | |
| 291 { | |
| 292 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 293 return(0); | |
| 294 } /* if */ | |
| 295 | |
| 296 if (!FLAC__stream_decoder_process_one_frame(f->decoder)) | |
| 297 { | |
|
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77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
298 Sound_SetError("FLAC: Couldn't decode frame."); |
| 155 | 299 sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 300 return(0); | |
| 301 } /* if */ | |
| 302 | |
|
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77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
303 /* An error may have been signalled through the error callback. */ |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
304 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
305 return(0); |
|
77482005beb6
Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents:
155
diff
changeset
|
306 |
| 155 | 307 return(f->frame_size); |
| 308 } /* FLAC_read */ | |
| 309 | |
| 310 #endif /* SOUND_SUPPORTS_FLAC */ | |
| 311 | |
| 312 | |
| 313 /* end of flac.c ... */ |