Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 581:2264b134b7ac
merged
| author | Eric Wing <ewing . public |-at-| gmail . com> |
|---|---|
| date | Tue, 23 Nov 2010 18:25:44 -0800 |
| parents | 2e8907ff98e9 |
| children |
| 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 LICENSE.txt in the source's root directory. |
| 155 | 28 * |
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29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) |
| 155 | 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 #include <FLAC/export.h> |
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48 |
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49 /* FLAC 1.1.3 has FLAC_API_VERSION_CURRENT == 8 */ |
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50 #if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT < 8 |
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51 #define LEGACY_FLAC |
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52 #else |
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53 #undef LEGACY_FLAC |
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54 #endif |
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55 |
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56 #ifdef LEGACY_FLAC |
| 443 | 57 #include <FLAC/seekable_stream_decoder.h> |
| 312 | 58 |
| 59 #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM | |
| 60 | |
| 61 #define d_new() FLAC__seekable_stream_decoder_new() | |
| 62 #define d_init(x) FLAC__seekable_stream_decoder_init(x) | |
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63 #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_until_end_of_metadata(x) |
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64 #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_single(x) |
| 312 | 65 #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) |
| 66 #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) | |
| 67 #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) | |
| 68 #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) | |
| 69 #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) | |
| 70 #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) | |
| 71 #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) | |
| 72 #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) | |
| 73 | |
| 74 typedef FLAC__SeekableStreamDecoder decoder_t; | |
| 75 typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; | |
| 76 | |
| 77 #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK | |
| 78 #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR | |
| 79 #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK | |
| 80 #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR | |
| 81 #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK | |
| 82 #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR | |
| 83 | |
| 84 #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) | |
| 85 #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) | |
| 86 #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) | |
| 87 #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) | |
| 88 #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) | |
| 89 | |
| 90 typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; | |
| 91 typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; | |
| 92 typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; | |
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93 #else |
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94 #include <FLAC/stream_decoder.h> |
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95 |
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96 #define D_END_OF_STREAM FLAC__STREAM_DECODER_END_OF_STREAM |
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97 |
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98 #define d_new() FLAC__stream_decoder_new() |
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99 #define d_process_metadata(x) FLAC__stream_decoder_process_until_end_of_metadata(x) |
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100 #define d_process_one_frame(x) FLAC__stream_decoder_process_single(x) |
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101 #define d_get_state(x) FLAC__stream_decoder_get_state(x) |
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102 #define d_finish(x) FLAC__stream_decoder_finish(x) |
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103 #define d_delete(x) FLAC__stream_decoder_delete(x) |
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104 |
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105 typedef FLAC__StreamDecoder decoder_t; |
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106 typedef FLAC__StreamDecoderReadStatus d_read_status_t; |
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107 |
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108 #define D_SEEK_STATUS_OK FLAC__STREAM_DECODER_SEEK_STATUS_OK |
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109 #define D_SEEK_STATUS_ERROR FLAC__STREAM_DECODER_SEEK_STATUS_ERROR |
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110 #define D_TELL_STATUS_OK FLAC__STREAM_DECODER_TELL_STATUS_OK |
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111 #define D_TELL_STATUS_ERROR FLAC__STREAM_DECODER_TELL_STATUS_ERROR |
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112 #define D_LENGTH_STATUS_OK FLAC__STREAM_DECODER_LENGTH_STATUS_OK |
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113 #define D_LENGTH_STATUS_ERROR FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR |
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114 |
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115 #define d_seek_absolute(x, y) FLAC__stream_decoder_seek_absolute(x, y) |
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116 |
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117 typedef FLAC__StreamDecoderSeekStatus d_seek_status_t; |
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118 typedef FLAC__StreamDecoderTellStatus d_tell_status_t; |
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119 typedef FLAC__StreamDecoderLengthStatus d_length_status_t; |
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120 #endif |
| 312 | 121 |
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122 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE |
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123 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM |
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124 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_STATUS_ABORT |
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125 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_STATUS_CONTINUE |
| 312 | 126 |
| 127 #define d_error_status_string FLAC__StreamDecoderErrorStatusString | |
| 128 | |
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129 typedef FLAC__StreamDecoderErrorStatus d_error_status_t; |
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130 typedef FLAC__StreamMetadata d_metadata_t; |
| 312 | 131 typedef FLAC__StreamDecoderWriteStatus d_write_status_t; |
| 132 | |
| 155 | 133 |
| 134 static int FLAC_init(void); | |
| 135 static void FLAC_quit(void); | |
| 136 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
| 137 static void FLAC_close(Sound_Sample *sample); | |
| 138 static Uint32 FLAC_read(Sound_Sample *sample); | |
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139 static int FLAC_rewind(Sound_Sample *sample); |
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140 static int FLAC_seek(Sound_Sample *sample, Uint32 ms); |
| 155 | 141 |
| 142 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
| 143 | |
| 144 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
| 145 { | |
| 146 { | |
| 147 extensions_flac, | |
| 148 "Free Lossless Audio Codec", | |
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149 "Torbjörn Andersson <d91tan@Update.UU.SE>", |
| 155 | 150 "http://flac.sourceforge.net/" |
| 151 }, | |
| 152 | |
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153 FLAC_init, /* init() method */ |
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154 FLAC_quit, /* quit() method */ |
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155 FLAC_open, /* open() method */ |
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156 FLAC_close, /* close() method */ |
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157 FLAC_read, /* read() method */ |
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158 FLAC_rewind, /* rewind() method */ |
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159 FLAC_seek /* seek() method */ |
| 155 | 160 }; |
| 161 | |
| 162 /* This is what we store in our internal->decoder_private field. */ | |
| 163 typedef struct | |
| 164 { | |
| 312 | 165 decoder_t *decoder; |
| 155 | 166 SDL_RWops *rw; |
| 167 Sound_Sample *sample; | |
| 168 Uint32 frame_size; | |
|
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169 Uint8 is_flac; |
| 312 | 170 Uint32 stream_length; |
| 155 | 171 } flac_t; |
| 172 | |
| 173 | |
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174 static void free_flac(flac_t *f) |
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175 { |
| 312 | 176 d_finish(f->decoder); |
| 177 d_delete(f->decoder); | |
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178 free(f); |
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179 } /* free_flac */ |
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180 |
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181 |
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182 #ifdef LEGACY_FLAC |
| 312 | 183 static d_read_status_t read_callback( |
| 184 const decoder_t *decoder, FLAC__byte buffer[], | |
| 155 | 185 unsigned int *bytes, void *client_data) |
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186 #else |
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187 static d_read_status_t read_callback( |
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188 const decoder_t *decoder, FLAC__byte buffer[], |
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189 size_t *bytes, void *client_data) |
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190 #endif |
| 155 | 191 { |
| 192 flac_t *f = (flac_t *) client_data; | |
| 193 Uint32 retval; | |
| 194 | |
| 195 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
| 196 | |
| 197 if (retval == 0) | |
| 198 { | |
| 199 *bytes = 0; | |
| 200 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 312 | 201 return(D_READ_END_OF_STREAM); |
| 155 | 202 } /* if */ |
| 203 | |
| 204 if (retval == -1) | |
| 205 { | |
| 206 *bytes = 0; | |
| 207 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 312 | 208 return(D_READ_ABORT); |
| 155 | 209 } /* if */ |
| 210 | |
| 211 if (retval < *bytes) | |
| 212 { | |
| 213 *bytes = retval; | |
| 214 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 215 } /* if */ | |
| 216 | |
| 312 | 217 return(D_READ_CONTINUE); |
| 218 } /* read_callback */ | |
| 155 | 219 |
| 220 | |
| 312 | 221 static d_write_status_t write_callback( |
| 222 const decoder_t *decoder, const FLAC__Frame *frame, | |
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223 const FLAC__int32 * const buffer[], |
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224 void *client_data) |
| 155 | 225 { |
| 226 flac_t *f = (flac_t *) client_data; | |
| 227 Uint32 i, j; | |
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228 Uint32 sample; |
| 155 | 229 Uint8 *dst; |
| 230 | |
| 231 f->frame_size = frame->header.channels * frame->header.blocksize | |
| 232 * frame->header.bits_per_sample / 8; | |
| 233 | |
| 234 if (f->frame_size > f->sample->buffer_size) | |
| 235 Sound_SetBufferSize(f->sample, f->frame_size); | |
| 236 | |
| 237 dst = f->sample->buffer; | |
| 238 | |
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239 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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240 * be converted. Unfortunately the buffer is read-only, so we either |
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241 * have to check for each sample, or make a copy of the buffer. I'm |
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242 * not sure which way is best, so I've arbitrarily picked the former. |
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243 */ |
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244 if (f->sample->actual.format == AUDIO_S8) |
| 155 | 245 { |
| 246 for (i = 0; i < frame->header.blocksize; i++) | |
| 247 for (j = 0; j < frame->header.channels; j++) | |
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248 { |
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249 sample = buffer[j][i]; |
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250 if (frame->header.bits_per_sample < 8) |
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251 sample <<= (8 - frame->header.bits_per_sample); |
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252 *dst++ = sample & 0x00ff; |
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253 } /* for */ |
| 155 | 254 } /* if */ |
| 255 else | |
| 256 { | |
| 257 for (i = 0; i < frame->header.blocksize; i++) | |
| 258 for (j = 0; j < frame->header.channels; j++) | |
| 259 { | |
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260 sample = buffer[j][i]; |
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261 if (frame->header.bits_per_sample < 16) |
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262 sample <<= (16 - frame->header.bits_per_sample); |
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263 else if (frame->header.bits_per_sample > 16) |
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264 sample >>= (frame->header.bits_per_sample - 16); |
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265 *dst++ = (sample & 0xff00) >> 8; |
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266 *dst++ = sample & 0x00ff; |
| 155 | 267 } /* for */ |
| 268 } /* else */ | |
| 269 | |
| 312 | 270 return(D_WRITE_CONTINUE); |
| 271 } /* write_callback */ | |
| 155 | 272 |
| 273 | |
| 312 | 274 static void metadata_callback( |
| 275 const decoder_t *decoder, | |
| 276 const d_metadata_t *metadata, | |
| 155 | 277 void *client_data) |
| 278 { | |
| 279 flac_t *f = (flac_t *) client_data; | |
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280 Sound_Sample *sample = f->sample; |
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281 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
| 312 | 282 |
| 155 | 283 SNDDBG(("FLAC: Metadata callback.\n")); |
| 284 | |
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285 /* There are several kinds of metadata, but STREAMINFO is the only |
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286 * one that always has to be there. |
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287 */ |
| 155 | 288 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
| 289 { | |
| 290 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
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291 |
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292 f->is_flac = 1; |
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293 sample->actual.channels = metadata->data.stream_info.channels; |
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294 sample->actual.rate = metadata->data.stream_info.sample_rate; |
| 155 | 295 |
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296 if (metadata->data.stream_info.sample_rate == 0 || |
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297 metadata->data.stream_info.total_samples == 0) |
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298 { |
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299 internal->total_time = -1; |
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300 } /* if */ |
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301 else |
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302 { |
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303 internal->total_time = (metadata->data.stream_info.total_samples) |
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304 / metadata->data.stream_info.sample_rate * 1000; |
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305 internal->total_time += (metadata->data.stream_info.total_samples |
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306 % metadata->data.stream_info.sample_rate) * 1000 |
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307 / metadata->data.stream_info.sample_rate; |
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308 } /* else */ |
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309 |
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310 if (metadata->data.stream_info.bits_per_sample > 8) |
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311 sample->actual.format = AUDIO_S16MSB; |
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312 else |
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313 sample->actual.format = AUDIO_S8; |
| 155 | 314 } /* if */ |
| 312 | 315 } /* metadata_callback */ |
| 155 | 316 |
| 317 | |
| 312 | 318 static void error_callback( |
| 319 const decoder_t *decoder, | |
| 320 d_error_status_t status, | |
| 155 | 321 void *client_data) |
| 322 { | |
| 323 flac_t *f = (flac_t *) client_data; | |
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324 |
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325 __Sound_SetError(d_error_status_string[status]); |
| 155 | 326 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
| 312 | 327 } /* error_callback */ |
| 328 | |
| 329 | |
| 330 static d_seek_status_t seek_callback( | |
| 331 const decoder_t *decoder, | |
| 332 FLAC__uint64 absolute_byte_offset, | |
| 333 void *client_data) | |
| 334 { | |
| 335 flac_t *f = (flac_t *) client_data; | |
| 336 | |
| 337 if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) | |
| 338 { | |
| 339 return(D_SEEK_STATUS_OK); | |
| 340 } /* if */ | |
| 341 | |
| 342 return(D_SEEK_STATUS_ERROR); | |
| 343 } /* seek_callback*/ | |
| 344 | |
| 345 | |
| 346 static d_tell_status_t tell_callback( | |
| 347 const decoder_t *decoder, | |
| 348 FLAC__uint64 *absolute_byte_offset, | |
| 349 void *client_data) | |
| 350 { | |
| 351 flac_t *f = (flac_t *) client_data; | |
| 400 | 352 int pos; |
| 312 | 353 |
| 354 pos = SDL_RWtell(f->rw); | |
| 355 | |
| 356 if (pos < 0) | |
| 357 { | |
| 358 return(D_TELL_STATUS_ERROR); | |
| 359 } /* if */ | |
| 155 | 360 |
| 312 | 361 *absolute_byte_offset = pos; |
| 362 return(D_TELL_STATUS_OK); | |
| 363 } /* tell_callback */ | |
| 364 | |
| 365 | |
| 366 static d_length_status_t length_callback( | |
| 367 const decoder_t *decoder, | |
| 368 FLAC__uint64 *stream_length, | |
| 369 void *client_data) | |
| 370 { | |
| 371 flac_t *f = (flac_t *) client_data; | |
| 372 | |
| 373 if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) | |
| 374 { | |
| 375 *stream_length = f->stream_length; | |
| 376 return(D_LENGTH_STATUS_OK); | |
| 377 } /* if */ | |
| 378 | |
| 379 return(D_LENGTH_STATUS_ERROR); | |
| 380 } /* length_callback */ | |
| 381 | |
| 382 | |
| 383 static FLAC__bool eof_callback( | |
| 384 const decoder_t *decoder, | |
| 385 void *client_data) | |
| 386 { | |
| 387 flac_t *f = (flac_t *) client_data; | |
| 400 | 388 int pos; |
| 312 | 389 |
| 390 /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ | |
| 391 pos = SDL_RWtell(f->rw); | |
| 392 | |
| 393 if (pos >= 0 && pos >= f->stream_length) | |
| 394 { | |
| 395 return(true); | |
| 396 } /* if */ | |
| 397 | |
| 398 return(false); | |
| 399 } /* eof_callback */ | |
| 400 | |
| 155 | 401 |
| 402 static int FLAC_init(void) | |
| 403 { | |
| 404 return(1); /* always succeeds. */ | |
| 405 } /* FLAC_init */ | |
| 406 | |
| 407 | |
| 408 static void FLAC_quit(void) | |
| 409 { | |
| 410 /* it's a no-op. */ | |
| 411 } /* FLAC_quit */ | |
| 412 | |
| 413 | |
|
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414 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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415 |
| 155 | 416 static int FLAC_open(Sound_Sample *sample, const char *ext) |
| 417 { | |
| 418 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 419 SDL_RWops *rw = internal->rw; | |
| 312 | 420 decoder_t *decoder; |
| 155 | 421 flac_t *f; |
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422 int i; |
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423 int has_extension = 0; |
| 312 | 424 Uint32 pos; |
|
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425 |
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426 /* |
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427 * If the extension is "flac", we'll believe that this is really meant |
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428 * to be a FLAC stream, and will try to grok it from existing metadata. |
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429 * metadata searching can be a very expensive operation, however, so |
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430 * unless the user swears that it is a FLAC stream through the extension, |
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431 * we decide what to do based on the existance of a 32-bit magic number. |
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432 */ |
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433 for (i = 0; extensions_flac[i] != NULL; i++) |
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434 { |
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435 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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436 { |
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437 has_extension = 1; |
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438 break; |
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439 } /* if */ |
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440 } /* for */ |
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441 |
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442 if (!has_extension) |
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443 { |
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444 int rc; |
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445 Uint32 flac_magic = SDL_ReadLE32(rw); |
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446 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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447 |
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448 /* move back over magic number for metadata scan... */ |
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449 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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450 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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451 } /* if */ |
| 155 | 452 |
| 453 f = (flac_t *) malloc(sizeof (flac_t)); | |
| 454 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 455 | |
| 312 | 456 decoder = d_new(); |
| 155 | 457 if (decoder == NULL) |
| 458 { | |
| 459 free(f); | |
|
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460 BAIL_MACRO(ERR_OUT_OF_MEMORY, 0); |
| 155 | 461 } /* if */ |
| 462 | |
|
516
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463 #ifdef LEGACY_FLAC |
| 312 | 464 d_set_read_callback(decoder, read_callback); |
| 465 d_set_write_callback(decoder, write_callback); | |
| 466 d_set_metadata_callback(decoder, metadata_callback); | |
| 467 d_set_error_callback(decoder, error_callback); | |
| 468 d_set_seek_callback(decoder, seek_callback); | |
| 469 d_set_tell_callback(decoder, tell_callback); | |
| 470 d_set_length_callback(decoder, length_callback); | |
| 471 d_set_eof_callback(decoder, eof_callback); | |
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472 |
| 312 | 473 d_set_client_data(decoder, f); |
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474 #endif |
| 155 | 475 |
| 476 f->rw = internal->rw; | |
| 477 f->sample = sample; | |
| 478 f->decoder = decoder; | |
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479 f->sample->actual.format = 0; |
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480 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
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481 |
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482 internal->decoder_private = f; |
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483 /* really should check the init return value here: */ |
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484 #ifdef LEGACY_FLAC |
| 312 | 485 d_init(decoder); |
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486 #else |
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487 FLAC__stream_decoder_init_stream(decoder, read_callback, seek_callback, |
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488 tell_callback, length_callback, |
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489 eof_callback, write_callback, |
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490 metadata_callback, error_callback, f); |
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491 #endif |
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492 |
| 400 | 493 sample->flags = SOUND_SAMPLEFLAG_NONE; |
| 494 | |
| 495 pos = SDL_RWtell(f->rw); | |
| 496 if (SDL_RWseek(f->rw, 0, SEEK_END) > 0) | |
| 497 { | |
| 498 f->stream_length = SDL_RWtell(f->rw); | |
| 499 if (SDL_RWseek(f->rw, pos, SEEK_SET) == -1) | |
| 500 { | |
| 501 free_flac(f); | |
| 502 BAIL_MACRO(ERR_IO_ERROR, 0); | |
| 503 } /* if */ | |
| 504 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; | |
| 505 } /* if */ | |
| 506 | |
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507 /* |
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508 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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509 * metadata block. If not, we'd have to peek at the first audio frame |
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510 * and get the sound format from there, but that is not yet |
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511 * implemented. |
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512 */ |
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513 if (!f->is_flac) |
| 155 | 514 { |
| 312 | 515 d_process_metadata(decoder); |
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516 |
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517 /* Still not FLAC? Give up. */ |
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518 if (!f->is_flac) |
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519 { |
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520 free_flac(f); |
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521 BAIL_MACRO("FLAC: No metadata found. Not a FLAC stream?", 0); |
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522 } /* if */ |
| 155 | 523 } /* if */ |
| 524 | |
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525 SNDDBG(("FLAC: Accepting data stream.\n")); |
| 155 | 526 return(1); |
| 527 } /* FLAC_open */ | |
| 528 | |
| 529 | |
| 530 static void FLAC_close(Sound_Sample *sample) | |
| 531 { | |
| 532 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 533 flac_t *f = (flac_t *) internal->decoder_private; | |
| 534 | |
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535 free_flac(f); |
| 155 | 536 } /* FLAC_close */ |
| 537 | |
| 538 | |
| 539 static Uint32 FLAC_read(Sound_Sample *sample) | |
| 540 { | |
| 541 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 542 flac_t *f = (flac_t *) internal->decoder_private; | |
| 543 Uint32 len; | |
| 544 | |
| 312 | 545 if (!d_process_one_frame(f->decoder)) |
| 155 | 546 { |
| 547 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
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548 BAIL_MACRO("FLAC: Couldn't decode frame.", 0); |
| 155 | 549 } /* if */ |
| 550 | |
| 312 | 551 if (d_get_state(f->decoder) == D_END_OF_STREAM) |
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552 { |
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553 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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554 return(0); |
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555 } /* if */ |
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556 |
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557 /* An error may have been signalled through the error callback. */ |
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558 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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559 return(0); |
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560 |
| 155 | 561 return(f->frame_size); |
| 562 } /* FLAC_read */ | |
| 563 | |
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564 |
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565 static int FLAC_rewind(Sound_Sample *sample) |
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566 { |
| 312 | 567 return FLAC_seek(sample, 0); |
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568 } /* FLAC_rewind */ |
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569 |
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570 |
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571 static int FLAC_seek(Sound_Sample *sample, Uint32 ms) |
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572 { |
| 312 | 573 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
| 574 flac_t *f = (flac_t *) internal->decoder_private; | |
| 575 | |
| 576 d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); | |
| 577 return(1); | |
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578 } /* FLAC_seek */ |
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579 |
| 155 | 580 #endif /* SOUND_SUPPORTS_FLAC */ |
| 581 | |
| 582 /* end of flac.c ... */ |