Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 393:b12c4483815e
Handles all versions of libFLAC up to version 1.0.3, now.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 11 Jul 2002 04:33:08 +0000 |
| parents | fb519e6028e3 |
| children | 9d0b5ec9cc26 |
| 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 | |
| 42 #include "SDL_sound.h" | |
| 43 | |
| 44 #define __SDL_SOUND_INTERNAL__ | |
| 45 #include "SDL_sound_internal.h" | |
| 46 | |
|
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47 /* |
| 312 | 48 * FLAC 1.0.1 added a seekable stream decoder. To be able to reuse as much as |
| 49 * possible of the non-seekable FLAC decoder, we define a set of wrapper | |
| 50 * macros and typedefs to map onto the right set of functions and data types. | |
| 51 * | |
| 52 * An added benefit is that we get identifiers of manageable length. | |
|
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53 */ |
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54 |
| 312 | 55 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 56 | |
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57 #define FLAC_IS_SEEKABLE 1 |
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58 |
| 312 | 59 #include "FLAC/seekable_stream_decoder.h" |
| 60 | |
| 61 #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM | |
| 62 | |
| 63 #define d_new() FLAC__seekable_stream_decoder_new() | |
| 64 #define d_init(x) FLAC__seekable_stream_decoder_init(x) | |
| 65 #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_metadata(x) | |
| 66 #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_one_frame(x) | |
| 67 #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) | |
| 68 #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) | |
| 69 #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) | |
| 70 #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) | |
| 71 #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) | |
| 72 #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) | |
| 73 #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) | |
| 74 #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) | |
| 75 | |
| 76 typedef FLAC__SeekableStreamDecoder decoder_t; | |
| 77 typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; | |
| 78 | |
| 79 /* Only in the seekable decoder */ | |
| 80 | |
| 81 #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK | |
| 82 #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR | |
| 83 #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK | |
| 84 #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR | |
| 85 #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK | |
| 86 #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR | |
| 87 | |
| 88 #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) | |
| 89 #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) | |
| 90 #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) | |
| 91 #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) | |
| 92 #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) | |
| 93 | |
| 94 typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; | |
| 95 typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; | |
| 96 typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; | |
| 97 | |
| 98 #else | |
| 99 | |
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100 #include "FLAC/stream_decoder.h" |
| 155 | 101 |
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102 #define FLAC_IS_SEEKABLE 0 |
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103 |
| 312 | 104 #define D_END_OF_STREAM FLAC__STREAM_DECODER_END_OF_STREAM |
| 105 | |
| 106 #define d_new() FLAC__stream_decoder_new() | |
| 107 #define d_init(x) FLAC__stream_decoder_init(x) | |
| 108 #define d_process_metadata(x) FLAC__stream_decoder_process_metadata(x) | |
| 109 #define d_process_one_frame(x) FLAC__stream_decoder_process_one_frame(x) | |
| 110 #define d_get_state(x) FLAC__stream_decoder_get_state(x) | |
| 111 #define d_finish(x) FLAC__stream_decoder_finish(x) | |
| 112 #define d_delete(x) FLAC__stream_decoder_delete(x) | |
| 113 #define d_set_read_callback(x, y) FLAC__stream_decoder_set_read_callback(x, y) | |
| 114 #define d_set_write_callback(x, y) FLAC__stream_decoder_set_write_callback(x, y) | |
| 115 #define d_set_metadata_callback(x, y) FLAC__stream_decoder_set_metadata_callback(x, y) | |
| 116 #define d_set_error_callback(x, y) FLAC__stream_decoder_set_error_callback(x, y) | |
| 117 #define d_set_client_data(x, y) FLAC__stream_decoder_set_client_data(x, y) | |
| 118 | |
| 119 typedef FLAC__StreamDecoder decoder_t; | |
| 120 typedef FLAC__StreamDecoderReadStatus d_read_status_t; | |
| 121 | |
| 122 /* Only in the non-seekable decoder */ | |
| 123 | |
| 124 #define d_reset(x) FLAC__stream_decoder_reset(x) | |
| 125 | |
| 126 #endif | |
| 127 | |
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128 /* |
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129 * FLAC 1.0.3 changed some symbol names, so we need to change what we |
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130 * reference depending on what version of their headers we compile against. |
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131 * We check for a #define that was included in FLAC 1.0.3 but doesn't exist |
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132 * in 1.0.2 and earlier. Fun. --ryan. |
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133 */ |
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134 #if (defined FLAC__STREAM_SYNC_LENGTH) |
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135 #define FLAC_VERSION_102_OR_LESS 0 |
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136 #else |
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137 #define FLAC_VERSION_102_OR_LESS 1 |
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138 #endif |
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139 |
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140 |
| 312 | 141 /* These are the same for both decoders, so they're just cosmetics. */ |
| 142 | |
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143 #if FLAC_VERSION_102_OR_LESS |
| 312 | 144 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_CONTINUE |
| 145 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_END_OF_STREAM | |
| 146 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_ABORT | |
| 147 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_CONTINUE | |
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148 #else |
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149 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE |
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150 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM |
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151 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_STATUS_ABORT |
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152 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_STATUS_CONTINUE |
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153 #endif |
| 312 | 154 |
| 155 #define d_error_status_string FLAC__StreamDecoderErrorStatusString | |
| 156 | |
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157 typedef FLAC__StreamDecoderErrorStatus d_error_status_t; |
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158 #if FLAC_VERSION_102_OR_LESS |
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159 typedef FLAC__StreamMetaData d_metadata_t; |
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160 #else |
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161 typedef FLAC__StreamMetadata d_metadata_t; |
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162 #endif |
| 312 | 163 typedef FLAC__StreamDecoderWriteStatus d_write_status_t; |
| 164 | |
| 155 | 165 |
| 166 static int FLAC_init(void); | |
| 167 static void FLAC_quit(void); | |
| 168 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
| 169 static void FLAC_close(Sound_Sample *sample); | |
| 170 static Uint32 FLAC_read(Sound_Sample *sample); | |
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171 static int FLAC_rewind(Sound_Sample *sample); |
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172 static int FLAC_seek(Sound_Sample *sample, Uint32 ms); |
| 155 | 173 |
| 174 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
| 175 | |
| 176 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
| 177 { | |
| 178 { | |
| 179 extensions_flac, | |
| 180 "Free Lossless Audio Codec", | |
| 181 "Torbjörn Andersson <d91tan@Update.UU.SE>", | |
| 182 "http://flac.sourceforge.net/" | |
| 183 }, | |
| 184 | |
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185 FLAC_init, /* init() method */ |
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186 FLAC_quit, /* quit() method */ |
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187 FLAC_open, /* open() method */ |
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188 FLAC_close, /* close() method */ |
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189 FLAC_read, /* read() method */ |
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190 FLAC_rewind, /* rewind() method */ |
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191 FLAC_seek /* seek() method */ |
| 155 | 192 }; |
| 193 | |
| 194 /* This is what we store in our internal->decoder_private field. */ | |
| 195 typedef struct | |
| 196 { | |
| 312 | 197 decoder_t *decoder; |
| 155 | 198 SDL_RWops *rw; |
| 199 Sound_Sample *sample; | |
| 200 Uint32 frame_size; | |
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201 Uint8 is_flac; |
| 312 | 202 |
| 203 #if !SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 204 Uint32 data_offset; | |
| 205 #else | |
| 206 Uint32 stream_length; | |
| 207 #endif | |
| 155 | 208 } flac_t; |
| 209 | |
| 210 | |
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211 static void free_flac(flac_t *f) |
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212 { |
| 312 | 213 d_finish(f->decoder); |
| 214 d_delete(f->decoder); | |
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215 free(f); |
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216 } /* free_flac */ |
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217 |
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218 |
| 312 | 219 static d_read_status_t read_callback( |
| 220 const decoder_t *decoder, FLAC__byte buffer[], | |
| 155 | 221 unsigned int *bytes, void *client_data) |
| 222 { | |
| 223 flac_t *f = (flac_t *) client_data; | |
| 224 Uint32 retval; | |
| 225 | |
| 226 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 227 | |
| 228 if (retval == 0) | |
| 229 { | |
| 230 *bytes = 0; | |
| 231 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 312 | 232 return(D_READ_END_OF_STREAM); |
| 155 | 233 } /* if */ |
| 234 | |
| 235 if (retval == -1) | |
| 236 { | |
| 237 *bytes = 0; | |
| 238 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 312 | 239 return(D_READ_ABORT); |
| 155 | 240 } /* if */ |
| 241 | |
| 242 if (retval < *bytes) | |
| 243 { | |
| 244 *bytes = retval; | |
| 245 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 246 } /* if */ | |
| 247 | |
| 312 | 248 return(D_READ_CONTINUE); |
| 249 } /* read_callback */ | |
| 155 | 250 |
| 251 | |
| 312 | 252 static d_write_status_t write_callback( |
| 253 const decoder_t *decoder, const FLAC__Frame *frame, | |
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254 #if FLAC_VERSION_102_OR_LESS |
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255 const FLAC__int32 * buffer[], |
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256 #else |
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257 const FLAC__int32 * const buffer[], |
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258 #endif |
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259 void *client_data) |
| 155 | 260 { |
| 261 flac_t *f = (flac_t *) client_data; | |
| 262 Uint32 i, j; | |
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263 Uint32 sample; |
| 155 | 264 Uint8 *dst; |
| 265 | |
| 266 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 267 * frame->header.bits_per_sample / 8; | |
| 268 | |
| 269 if (f->frame_size > f->sample->buffer_size) | |
| 270 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 271 | |
| 272 dst = f->sample->buffer; | |
| 273 | |
|
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274 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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275 * be converted. Unfortunately the buffer is read-only, so we either |
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276 * have to check for each sample, or make a copy of the buffer. I'm |
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277 * not sure which way is best, so I've arbitrarily picked the former. |
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278 */ |
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279 if (f->sample->actual.format == AUDIO_S8) |
| 155 | 280 { |
| 281 for (i = 0; i < frame->header.blocksize; i++) | |
| 282 for (j = 0; j < frame->header.channels; j++) | |
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283 { |
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284 sample = buffer[j][i]; |
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285 if (frame->header.bits_per_sample < 8) |
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286 sample <<= (8 - frame->header.bits_per_sample); |
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287 *dst++ = sample & 0x00ff; |
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288 } /* for */ |
| 155 | 289 } /* if */ |
| 290 else | |
| 291 { | |
| 292 for (i = 0; i < frame->header.blocksize; i++) | |
| 293 for (j = 0; j < frame->header.channels; j++) | |
| 294 { | |
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295 sample = buffer[j][i]; |
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296 if (frame->header.bits_per_sample < 16) |
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297 sample <<= (16 - frame->header.bits_per_sample); |
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298 else if (frame->header.bits_per_sample > 16) |
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299 sample >>= (frame->header.bits_per_sample - 16); |
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300 *dst++ = (sample & 0xff00) >> 8; |
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301 *dst++ = sample & 0x00ff; |
| 155 | 302 } /* for */ |
| 303 } /* else */ | |
| 304 | |
| 312 | 305 return(D_WRITE_CONTINUE); |
| 306 } /* write_callback */ | |
| 155 | 307 |
| 308 | |
| 312 | 309 static void metadata_callback( |
| 310 const decoder_t *decoder, | |
| 311 const d_metadata_t *metadata, | |
| 155 | 312 void *client_data) |
| 313 { | |
| 314 flac_t *f = (flac_t *) client_data; | |
| 312 | 315 |
| 155 | 316 SNDDBG(("FLAC: Metadata callback.\n")); |
| 317 | |
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318 /* There are several kinds of metadata, but STREAMINFO is the only |
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319 * one that always has to be there. |
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320 */ |
| 155 | 321 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 322 { | |
| 323 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
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324 |
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325 f->is_flac = 1; |
| 155 | 326 f->sample->actual.channels = metadata->data.stream_info.channels; |
| 327 f->sample->actual.rate = metadata->data.stream_info.sample_rate; | |
| 328 | |
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329 if (metadata->data.stream_info.bits_per_sample > 8) |
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330 f->sample->actual.format = AUDIO_S16MSB; |
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331 else |
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332 f->sample->actual.format = AUDIO_S8; |
| 155 | 333 } /* if */ |
| 312 | 334 } /* metadata_callback */ |
| 155 | 335 |
| 336 | |
| 312 | 337 static void error_callback( |
| 338 const decoder_t *decoder, | |
| 339 d_error_status_t status, | |
| 155 | 340 void *client_data) |
| 341 { | |
| 342 flac_t *f = (flac_t *) client_data; | |
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343 |
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344 __Sound_SetError(d_error_status_string[status]); |
| 155 | 345 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 312 | 346 } /* error_callback */ |
| 347 | |
| 348 | |
| 349 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 350 | |
| 351 static d_seek_status_t seek_callback( | |
| 352 const decoder_t *decoder, | |
| 353 FLAC__uint64 absolute_byte_offset, | |
| 354 void *client_data) | |
| 355 { | |
| 356 flac_t *f = (flac_t *) client_data; | |
| 357 | |
| 358 if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) | |
| 359 { | |
| 360 return(D_SEEK_STATUS_OK); | |
| 361 } /* if */ | |
| 362 | |
| 363 return(D_SEEK_STATUS_ERROR); | |
| 364 } /* seek_callback*/ | |
| 365 | |
| 366 | |
| 367 static d_tell_status_t tell_callback( | |
| 368 const decoder_t *decoder, | |
| 369 FLAC__uint64 *absolute_byte_offset, | |
| 370 void *client_data) | |
| 371 { | |
| 372 flac_t *f = (flac_t *) client_data; | |
| 373 int pos; /* !!! FIXME: int? Really? */ | |
| 374 | |
| 375 pos = SDL_RWtell(f->rw); | |
| 376 | |
| 377 if (pos < 0) | |
| 378 { | |
| 379 return(D_TELL_STATUS_ERROR); | |
| 380 } /* if */ | |
| 155 | 381 |
| 312 | 382 *absolute_byte_offset = pos; |
| 383 return(D_TELL_STATUS_OK); | |
| 384 } /* tell_callback */ | |
| 385 | |
| 386 | |
| 387 static d_length_status_t length_callback( | |
| 388 const decoder_t *decoder, | |
| 389 FLAC__uint64 *stream_length, | |
| 390 void *client_data) | |
| 391 { | |
| 392 flac_t *f = (flac_t *) client_data; | |
| 393 | |
| 394 if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) | |
| 395 { | |
| 396 *stream_length = f->stream_length; | |
| 397 return(D_LENGTH_STATUS_OK); | |
| 398 } /* if */ | |
| 399 | |
| 400 return(D_LENGTH_STATUS_ERROR); | |
| 401 } /* length_callback */ | |
| 402 | |
| 403 | |
| 404 static FLAC__bool eof_callback( | |
| 405 const decoder_t *decoder, | |
| 406 void *client_data) | |
| 407 { | |
| 408 flac_t *f = (flac_t *) client_data; | |
| 409 int pos; /* !!! FIXME: int? Really? */ | |
| 410 | |
| 411 /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ | |
| 412 pos = SDL_RWtell(f->rw); | |
| 413 | |
| 414 if (pos >= 0 && pos >= f->stream_length) | |
| 415 { | |
| 416 return(true); | |
| 417 } /* if */ | |
| 418 | |
| 419 return(false); | |
| 420 } /* eof_callback */ | |
| 421 | |
| 422 #endif | |
| 155 | 423 |
| 424 static int FLAC_init(void) | |
| 425 { | |
|
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426 SNDDBG(("FLAC: we are using libFLAC version %s 1.0.2.\n", |
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427 FLAC_VERSION_102_OR_LESS ? "<=" : ">")); |
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428 SNDDBG(("FLAC: We %shave seeking support.\n", |
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429 FLAC_IS_SEEKABLE ? "" : "do NOT ")); |
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430 |
| 155 | 431 return(1); /* always succeeds. */ |
| 432 } /* FLAC_init */ | |
| 433 | |
| 434 | |
| 435 static void FLAC_quit(void) | |
| 436 { | |
| 437 /* it's a no-op. */ | |
| 438 } /* FLAC_quit */ | |
| 439 | |
| 440 | |
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441 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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442 |
| 155 | 443 static int FLAC_open(Sound_Sample *sample, const char *ext) |
| 444 { | |
| 445 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 446 SDL_RWops *rw = internal->rw; | |
| 312 | 447 decoder_t *decoder; |
| 155 | 448 flac_t *f; |
|
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449 int i; |
|
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450 int has_extension = 0; |
| 312 | 451 |
| 452 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 453 Uint32 pos; | |
| 454 #endif | |
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455 |
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456 /* |
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457 * If the extension is "flac", we'll believe that this is really meant |
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458 * to be a FLAC stream, and will try to grok it from existing metadata. |
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459 * metadata searching can be a very expensive operation, however, so |
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460 * unless the user swears that it is a FLAC stream through the extension, |
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461 * we decide what to do based on the existance of a 32-bit magic number. |
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462 */ |
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463 for (i = 0; extensions_flac[i] != NULL; i++) |
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464 { |
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465 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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466 { |
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467 has_extension = 1; |
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468 break; |
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469 } /* if */ |
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470 } /* for */ |
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471 |
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472 if (!has_extension) |
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473 { |
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474 int rc; |
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475 Uint32 flac_magic = SDL_ReadLE32(rw); |
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476 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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477 |
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478 /* move back over magic number for metadata scan... */ |
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479 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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480 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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481 } /* if */ |
| 155 | 482 |
| 483 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 484 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 485 | |
| 312 | 486 decoder = d_new(); |
| 155 | 487 if (decoder == NULL) |
| 488 { | |
| 489 free(f); | |
|
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490 BAIL_MACRO(ERR_OUT_OF_MEMORY, 0); |
| 155 | 491 } /* if */ |
| 492 | |
| 312 | 493 d_set_read_callback(decoder, read_callback); |
| 494 d_set_write_callback(decoder, write_callback); | |
| 495 d_set_metadata_callback(decoder, metadata_callback); | |
| 496 d_set_error_callback(decoder, error_callback); | |
| 497 | |
| 498 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 499 d_set_seek_callback(decoder, seek_callback); | |
| 500 d_set_tell_callback(decoder, tell_callback); | |
| 501 d_set_length_callback(decoder, length_callback); | |
| 502 d_set_eof_callback(decoder, eof_callback); | |
| 503 #endif | |
| 504 | |
| 505 d_set_client_data(decoder, f); | |
| 155 | 506 |
| 507 f->rw = internal->rw; | |
| 508 f->sample = sample; | |
| 509 f->decoder = decoder; | |
|
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510 f->sample->actual.format = 0; |
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511 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
|
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512 |
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513 internal->decoder_private = f; |
| 312 | 514 d_init(decoder); |
|
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515 |
| 312 | 516 #if !SOUND_SUPPORTS_SEEKABLE_FLAC |
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517 /* |
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518 * Annoyingly, the rewind method will put the FLAC decoder in a state |
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519 * where it expects to read metadata, so we have to set this marker |
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520 * before the metadata block. |
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521 */ |
| 312 | 522 f->data_offset = SDL_RWtell(f->rw); |
| 523 #endif | |
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524 |
| 312 | 525 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 526 | |
| 527 #if SOUND_SUPPORTS_SEEKABLE_FLAC | |
| 528 /* | |
| 529 * FIXME?: For the seekable stream decoder to work, we need to know | |
| 530 * the length of the stream. This is so ugly... | |
| 531 */ | |
| 532 pos = SDL_RWtell(f->rw); | |
| 533 if (SDL_RWseek(f->rw, 0, SEEK_END)) | |
| 534 { | |
| 535 f->stream_length = SDL_RWtell(f->rw); | |
| 536 SDL_RWseek(f->rw, pos, SEEK_SET); | |
| 537 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; | |
| 538 } /* if */ | |
| 539 #endif | |
| 540 | |
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541 /* |
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542 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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543 * metadata block. If not, we'd have to peek at the first audio frame |
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544 * and get the sound format from there, but that is not yet |
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545 * implemented. |
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546 */ |
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547 if (!f->is_flac) |
| 155 | 548 { |
| 312 | 549 d_process_metadata(decoder); |
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550 |
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551 /* Still not FLAC? Give up. */ |
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552 if (!f->is_flac) |
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553 { |
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554 free_flac(f); |
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555 BAIL_MACRO("FLAC: No metadata found. Not a FLAC stream?", 0); |
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556 } /* if */ |
| 155 | 557 } /* if */ |
| 558 | |
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559 SNDDBG(("FLAC: Accepting data stream.\n")); |
| 155 | 560 return(1); |
| 561 } /* FLAC_open */ | |
| 562 | |
| 563 | |
| 564 static void FLAC_close(Sound_Sample *sample) | |
| 565 { | |
| 566 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 567 flac_t *f = (flac_t *) internal->decoder_private; | |
| 568 | |
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569 free_flac(f); |
| 155 | 570 } /* FLAC_close */ |
| 571 | |
| 572 | |
| 573 static Uint32 FLAC_read(Sound_Sample *sample) | |
| 574 { | |
| 575 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 576 flac_t *f = (flac_t *) internal->decoder_private; | |
| 577 Uint32 len; | |
| 578 | |
| 312 | 579 if (!d_process_one_frame(f->decoder)) |
| 155 | 580 { |
| 581 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
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582 BAIL_MACRO("FLAC: Couldn't decode frame.", 0); |
| 155 | 583 } /* if */ |
| 584 | |
| 312 | 585 if (d_get_state(f->decoder) == D_END_OF_STREAM) |
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586 { |
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587 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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588 return(0); |
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589 } /* if */ |
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590 |
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591 /* An error may have been signalled through the error callback. */ |
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592 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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593 return(0); |
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594 |
| 155 | 595 return(f->frame_size); |
| 596 } /* FLAC_read */ | |
| 597 | |
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598 |
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599 static int FLAC_rewind(Sound_Sample *sample) |
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600 { |
| 312 | 601 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 602 return FLAC_seek(sample, 0); | |
| 603 #else | |
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604 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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605 flac_t *f = (flac_t *) internal->decoder_private; |
| 312 | 606 int rc = SDL_RWseek(f->rw, f->data_offset, SEEK_SET); |
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607 |
| 312 | 608 BAIL_IF_MACRO(rc != f->data_offset, ERR_IO_ERROR, 0); |
| 609 BAIL_IF_MACRO(!d_reset(f->decoder), "FLAC: could not reset decoder", 0); | |
| 610 d_process_metadata(f->decoder); | |
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611 return(1); |
| 312 | 612 #endif |
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613 } /* FLAC_rewind */ |
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614 |
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615 |
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616 static int FLAC_seek(Sound_Sample *sample, Uint32 ms) |
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617 { |
| 312 | 618 #if SOUND_SUPPORTS_SEEKABLE_FLAC |
| 619 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 620 flac_t *f = (flac_t *) internal->decoder_private; | |
| 621 | |
| 622 d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); | |
| 623 return(1); | |
| 624 #else | |
| 625 BAIL_MACRO("FLAC: This is the non-seekable version of the decoder!", 0); | |
| 626 #endif | |
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627 } /* FLAC_seek */ |
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628 |
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629 |
| 155 | 630 #endif /* SOUND_SUPPORTS_FLAC */ |
| 631 | |
| 632 | |
| 633 /* end of flac.c ... */ |