Mercurial > SDL_sound_CoreAudio
annotate decoders/speex.c @ 492:1b91006ebfef stable-1.0
Added playsound_simple.c, which is a better example
than the monster playsound.c.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 01 Oct 2005 15:35:09 +0000 |
| parents | 6bd7ca7d218b |
| children | 1841bdcf2122 50bb9a6cebfe |
| rev | line source |
|---|---|
| 451 | 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 * Speex decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles Speex audio data. Speex is a codec for speech that is | |
| 24 * meant to be transmitted over narrowband network connections. Epic Games | |
| 25 * estimates that their VoIP solution, built on top of Speex, uses around | |
| 26 * 500 bytes per second or less to transmit relatively good sounding speech. | |
| 27 * | |
| 28 * This decoder processes the .spx files that the speexenc program produces. | |
| 29 * | |
| 30 * Speex isn't meant for general audio compression. Something like Ogg Vorbis | |
| 31 * will give better results in that case. | |
| 32 * | |
| 33 * Further Speex information can be found at http://www.speex.org/ | |
| 34 * | |
| 35 * This code is based on speexdec.c (see the Speex website). | |
| 36 * | |
| 37 * Please see the file COPYING in the source's root directory. | |
| 38 * | |
| 39 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 40 */ | |
| 41 | |
| 42 #if HAVE_CONFIG_H | |
| 43 # include <config.h> | |
| 44 #endif | |
| 45 | |
| 46 #ifdef SOUND_SUPPORTS_SPEEX | |
| 47 | |
| 48 #include <stdio.h> | |
| 49 #include <stdlib.h> | |
| 50 #include <string.h> | |
| 51 #include <assert.h> | |
| 52 | |
| 53 #include <ogg/ogg.h> | |
| 54 #include <speex.h> | |
| 55 #include <speex_header.h> | |
| 56 | |
| 57 #include "SDL_sound.h" | |
| 58 | |
| 59 #define __SDL_SOUND_INTERNAL__ | |
| 60 #include "SDL_sound_internal.h" | |
| 61 | |
| 62 static int SPEEX_init(void); | |
| 63 static void SPEEX_quit(void); | |
| 64 static int SPEEX_open(Sound_Sample *sample, const char *ext); | |
| 65 static void SPEEX_close(Sound_Sample *sample); | |
| 66 static Uint32 SPEEX_read(Sound_Sample *sample); | |
| 67 static int SPEEX_rewind(Sound_Sample *sample); | |
| 68 static int SPEEX_seek(Sound_Sample *sample, Uint32 ms); | |
| 69 | |
| 70 static const char *extensions_speex[] = { "spx", NULL }; | |
| 71 const Sound_DecoderFunctions __Sound_DecoderFunctions_SPEEX = | |
| 72 { | |
| 73 { | |
| 74 extensions_speex, | |
| 75 "SPEEX speech compression format", | |
| 76 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 77 "http://www.icculus.org/SDL_sound/" | |
| 78 }, | |
| 79 | |
| 80 SPEEX_init, /* init() method */ | |
| 81 SPEEX_quit, /* quit() method */ | |
| 82 SPEEX_open, /* open() method */ | |
| 83 SPEEX_close, /* close() method */ | |
| 84 SPEEX_read, /* read() method */ | |
| 85 SPEEX_rewind, /* rewind() method */ | |
| 86 SPEEX_seek /* seek() method */ | |
| 87 }; | |
| 88 | |
| 89 #define SPEEX_USE_PERCEPTUAL_ENHANCER 1 | |
| 90 #define SPEEX_MAGIC 0x5367674F /* "OggS" in ASCII (littleendian) */ | |
| 91 #define SPEEX_OGG_BUFSIZE 200 | |
| 92 | |
| 93 /* this is what we store in our internal->decoder_private field... */ | |
| 94 typedef struct | |
| 95 { | |
| 96 ogg_sync_state oy; | |
| 97 ogg_page og; | |
| 98 ogg_packet op; | |
| 99 ogg_stream_state os; | |
| 100 void *state; | |
| 101 SpeexBits bits; | |
| 102 int header_count; | |
| 103 int frame_size; | |
| 104 int nframes; | |
| 105 int frames_avail; | |
| 106 float *decode_buf; | |
| 107 int decode_total; | |
| 108 int decode_pos; | |
| 109 int have_ogg_packet; | |
| 110 } speex_t; | |
| 111 | |
| 112 | |
| 113 static int SPEEX_init(void) | |
| 114 { | |
| 115 return(1); /* no-op. */ | |
| 116 } /* SPEEX_init */ | |
| 117 | |
| 118 | |
| 119 static void SPEEX_quit(void) | |
| 120 { | |
| 121 /* no-op. */ | |
| 122 } /* SPEEX_quit */ | |
| 123 | |
| 124 | |
| 125 static int process_header(speex_t *speex, Sound_Sample *sample) | |
| 126 { | |
| 127 SpeexMode *mode; | |
| 128 SpeexHeader *hptr; | |
| 129 SpeexHeader header; | |
| 130 int enh_enabled = SPEEX_USE_PERCEPTUAL_ENHANCER; | |
| 131 int tmp; | |
| 132 | |
| 133 hptr = speex_packet_to_header((char*) speex->op.packet, speex->op.bytes); | |
| 134 BAIL_IF_MACRO(!hptr, "SPEEX: Cannot read header", 0); | |
| 135 memcpy(&header, hptr, sizeof (SpeexHeader)); /* move to stack. */ | |
| 136 free(hptr); /* lame that this forces you to malloc... */ | |
| 137 | |
| 138 BAIL_IF_MACRO(header.mode >= SPEEX_NB_MODES, "SPEEX: Unknown mode", 0); | |
| 139 mode = speex_mode_list[header.mode]; | |
| 140 BAIL_IF_MACRO(header.speex_version_id > 1, "SPEEX: Unknown version", 0); | |
| 141 BAIL_IF_MACRO(mode->bitstream_version < header.mode_bitstream_version, | |
| 142 "SPEEX: Unsupported bitstream version", 0); | |
| 143 BAIL_IF_MACRO(mode->bitstream_version > header.mode_bitstream_version, | |
| 144 "SPEEX: Unsupported bitstream version", 0); | |
| 145 | |
| 146 speex->state = speex_decoder_init(mode); | |
| 147 BAIL_IF_MACRO(!speex->state, "SPEEX: Decoder initialization error", 0); | |
| 148 | |
| 149 speex_decoder_ctl(speex->state, SPEEX_SET_ENH, &enh_enabled); | |
| 150 speex_decoder_ctl(speex->state, SPEEX_GET_FRAME_SIZE, &speex->frame_size); | |
| 151 | |
| 152 speex->decode_buf = (float *) malloc(speex->frame_size * sizeof (float)); | |
| 153 BAIL_IF_MACRO(!speex->decode_buf, ERR_OUT_OF_MEMORY, 0); | |
| 154 | |
| 155 speex->nframes = header.frames_per_packet; | |
| 156 if (!speex->nframes) | |
| 157 speex->nframes = 1; | |
| 158 | |
| 159 /* !!! FIXME: Write converters to match desired format. | |
| 160 !!! FIXME: We have to convert from Float32 anyhow. */ | |
| 161 /* !!! FIXME: Is it a performance hit to alter sampling rate? | |
| 162 !!! FIXME: If not, try to match desired rate. */ | |
| 163 /* !!! FIXME: We force mono output, but speexdec.c has code for stereo. | |
| 164 !!! FIXME: Use that if sample->desired.channels == 2? */ | |
| 165 tmp = header.rate; | |
| 166 speex_decoder_ctl(speex->state, SPEEX_SET_SAMPLING_RATE, &tmp); | |
| 167 speex_decoder_ctl(speex->state, SPEEX_GET_SAMPLING_RATE, &tmp); | |
| 168 sample->actual.rate = tmp; | |
| 169 sample->actual.channels = 1; | |
| 170 sample->actual.format = AUDIO_S16SYS; | |
| 171 | |
| 172 SNDDBG(("SPEEX: %dHz, mono, %svbr, %s mode.\n", | |
| 173 (int) sample->actual.rate, | |
| 174 header.vbr ? "" : "not ", | |
| 175 mode->modeName)); | |
| 176 | |
| 177 /* plus 2: one for this header, one for the comment header. */ | |
| 178 speex->header_count = header.extra_headers + 2; | |
| 179 return(1); | |
| 180 } /* process_header */ | |
| 181 | |
| 182 | |
| 183 /* !!! FIXME: this code sucks. */ | |
| 184 static int SPEEX_open(Sound_Sample *sample, const char *ext) | |
| 185 { | |
| 186 int set_error_str = 1; | |
| 187 int bitstream_initialized = 0; | |
| 188 Uint8 *buffer = NULL; | |
| 189 int packet_count = 0; | |
| 190 speex_t *speex = NULL; | |
| 191 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 192 SDL_RWops *rw = internal->rw; | |
| 193 Uint32 magic; | |
| 194 | |
| 195 /* Quick rejection. */ | |
| 196 /* | |
| 197 * !!! FIXME: If (ext) is .spx, ignore bad magic number and assume | |
| 198 * !!! FIXME: this is a corrupted file...try to sync up further in | |
| 199 * !!! FIXME: stream. But for general purposes we can't read the | |
| 200 * !!! FIXME: whole RWops here in case it's not a Speex file at all. | |
| 201 */ | |
| 202 magic = SDL_ReadLE32(rw); /* make sure this is an ogg stream. */ | |
| 203 BAIL_IF_MACRO(magic != SPEEX_MAGIC, "SPEEX: Not a complete ogg stream", 0); | |
| 204 BAIL_IF_MACRO(SDL_RWseek(rw, -4, SEEK_CUR) < 0, ERR_IO_ERROR, 0); | |
| 205 | |
| 206 speex = (speex_t *) malloc(sizeof (speex_t)); | |
| 207 BAIL_IF_MACRO(speex == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 208 memset(speex, '\0', sizeof (speex_t)); | |
| 209 | |
| 210 speex_bits_init(&speex->bits); | |
| 211 if (ogg_sync_init(&speex->oy) != 0) goto speex_open_failed; | |
| 212 | |
| 213 while (1) | |
| 214 { | |
| 215 int rc; | |
| 216 Uint8 *buffer = (Uint8*)ogg_sync_buffer(&speex->oy, SPEEX_OGG_BUFSIZE); | |
| 217 if (buffer == NULL) goto speex_open_failed; | |
| 218 rc = SDL_RWread(rw, buffer, 1, SPEEX_OGG_BUFSIZE); | |
| 219 if (rc <= 0) goto speex_open_failed; | |
| 220 if (ogg_sync_wrote(&speex->oy, rc) != 0) goto speex_open_failed; | |
| 221 while (ogg_sync_pageout(&speex->oy, &speex->og) == 1) | |
| 222 { | |
| 223 if (!bitstream_initialized) | |
| 224 { | |
| 225 if (ogg_stream_init(&speex->os, ogg_page_serialno(&speex->og))) | |
| 226 goto speex_open_failed; | |
| 227 bitstream_initialized = 1; | |
| 228 } /* if */ | |
| 229 | |
| 230 if (ogg_stream_pagein(&speex->os, &speex->og) != 0) | |
| 231 goto speex_open_failed; | |
| 232 | |
| 233 while (ogg_stream_packetout(&speex->os, &speex->op) == 1) | |
| 234 { | |
| 235 if (speex->op.e_o_s) | |
| 236 goto speex_open_failed; /* end of stream already?! */ | |
| 237 | |
| 238 packet_count++; | |
| 239 if (packet_count == 1) /* need speex header. */ | |
| 240 { | |
| 241 if (!process_header(speex, sample)) | |
| 242 { | |
| 243 set_error_str = 0; /* process_header will set error string. */ | |
| 244 goto speex_open_failed; | |
| 245 } /* if */ | |
| 246 } /* if */ | |
| 247 | |
| 248 if (packet_count > speex->header_count) | |
| 249 { | |
| 250 /* if you made it here, you're ready to get a waveform. */ | |
| 251 SNDDBG(("SPEEX: Accepting data stream.\n")); | |
| 252 | |
| 253 /* sample->actual is configured in process_header()... */ | |
| 254 speex->have_ogg_packet = 1; | |
| 255 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 256 internal->decoder_private = speex; | |
| 257 return(1); /* we'll handle this data. */ | |
| 258 } /* if */ | |
| 259 } /* while */ | |
| 260 | |
| 261 } /* while */ | |
| 262 | |
| 263 } /* while */ | |
| 264 | |
| 265 assert(0); /* shouldn't hit this point. */ | |
| 266 | |
| 267 speex_open_failed: | |
| 268 if (speex != NULL) | |
| 269 { | |
| 270 if (speex->state != NULL) | |
| 271 speex_decoder_destroy(speex->state); | |
| 272 if (bitstream_initialized) | |
| 273 ogg_stream_clear(&speex->os); | |
| 274 speex_bits_destroy(&speex->bits); | |
| 275 ogg_sync_clear(&speex->oy); | |
| 276 free(speex->decode_buf); | |
| 277 free(speex); | |
| 278 } /* if */ | |
| 279 | |
| 280 if (set_error_str) | |
| 281 BAIL_MACRO("SPEEX: decoding error", 0); | |
| 282 | |
| 283 return(0); | |
| 284 } /* SPEEX_open */ | |
| 285 | |
| 286 | |
| 287 static void SPEEX_close(Sound_Sample *sample) | |
| 288 { | |
| 289 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 290 speex_t *speex = (speex_t *) internal->decoder_private; | |
| 291 speex_decoder_destroy(speex->state); | |
| 292 ogg_stream_clear(&speex->os); | |
| 293 speex_bits_destroy(&speex->bits); | |
| 294 ogg_sync_clear(&speex->oy); | |
| 295 free(speex->decode_buf); | |
| 296 free(speex); | |
| 297 } /* SPEEX_close */ | |
| 298 | |
| 299 | |
| 300 static Uint32 copy_from_decoded(speex_t *speex, | |
| 301 Sound_SampleInternal *internal, | |
| 302 Uint32 _cpypos) | |
| 303 { | |
| 304 /* | |
| 305 * !!! FIXME: Obviously, this all needs to change if we allow for | |
| 306 * !!! FIXME: more than mono, S16SYS data. | |
| 307 */ | |
| 308 Uint32 cpypos = _cpypos >> 1; | |
| 309 Sint16 *dst = ((Sint16 *) internal->buffer) + cpypos; | |
| 310 Sint16 *max; | |
| 311 Uint32 maxoutput = (internal->buffer_size >> 1) - cpypos; | |
| 312 Uint32 maxavail = speex->decode_total - speex->decode_pos; | |
| 313 float *src = speex->decode_buf + speex->decode_pos; | |
| 314 | |
| 315 if (maxavail < maxoutput) | |
| 316 maxoutput = maxavail; | |
| 317 | |
| 318 speex->decode_pos += maxoutput; | |
| 319 cpypos += maxoutput; | |
| 320 | |
| 321 for (max = dst + maxoutput; dst < max; dst++, src++) | |
| 322 { | |
|
454
6bd7ca7d218b
Took out a C++-style comment.
Ryan C. Gordon <icculus@icculus.org>
parents:
451
diff
changeset
|
323 /* !!! FIXME: This screams for vectorization. */ |
| 451 | 324 register float f = *src; |
| 325 if (f > 32000.0f) /* eh, speexdec.c clamps like this, too. */ | |
| 326 f = 32000.0f; | |
| 327 else if (f < -32000.0f) | |
| 328 f = -32000.0f; | |
|
454
6bd7ca7d218b
Took out a C++-style comment.
Ryan C. Gordon <icculus@icculus.org>
parents:
451
diff
changeset
|
329 *dst = (Sint16) (0.5f + f); |
| 451 | 330 } /* for */ |
| 331 | |
| 332 return(cpypos << 1); | |
| 333 } /* copy_from_decoded */ | |
| 334 | |
| 335 | |
| 336 /* !!! FIXME: this code sucks. */ | |
| 337 static Uint32 SPEEX_read(Sound_Sample *sample) | |
| 338 { | |
| 339 Uint32 retval = 0; | |
| 340 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 341 speex_t *speex = (speex_t *) internal->decoder_private; | |
| 342 SDL_RWops *rw = internal->rw; | |
| 343 Uint8 *buffer; | |
| 344 int rc; | |
| 345 | |
| 346 while (1) | |
| 347 { | |
| 348 /* see if there's some already-decoded leftovers... */ | |
| 349 if (speex->decode_total != speex->decode_pos) | |
| 350 { | |
| 351 retval = copy_from_decoded(speex, internal, retval); | |
| 352 if (retval >= internal->buffer_size) | |
| 353 return(retval); /* whee. */ | |
| 354 } /* if */ | |
| 355 | |
| 356 /* okay, decoded buffer is spent. What else do we have? */ | |
| 357 speex->decode_total = speex->decode_pos = 0; | |
| 358 | |
| 359 if (speex->frames_avail) /* have more frames to decode? */ | |
| 360 { | |
| 361 rc = speex_decode(speex->state, &speex->bits, speex->decode_buf); | |
| 362 if (rc < 0) goto speex_read_failed; | |
| 363 if (speex_bits_remaining(&speex->bits) < 0) goto speex_read_failed; | |
| 364 speex->frames_avail--; | |
| 365 speex->decode_total = speex->frame_size; | |
| 366 continue; /* go fill the output buffer... */ | |
| 367 } /* if */ | |
| 368 | |
| 369 /* need to get more speex frames from available ogg packets... */ | |
| 370 if (speex->have_ogg_packet) | |
| 371 { | |
| 372 speex_bits_read_from(&speex->bits, | |
| 373 (char *) speex->op.packet, | |
| 374 speex->op.bytes); | |
| 375 | |
| 376 speex->frames_avail += speex->nframes; | |
| 377 if (ogg_stream_packetout(&speex->os, &speex->op) <= 0) | |
| 378 speex->have_ogg_packet = 0; | |
| 379 continue; /* go decode these frames. */ | |
| 380 } /* if */ | |
| 381 | |
| 382 /* need to get more ogg packets from bitstream... */ | |
| 383 | |
| 384 if (speex->op.e_o_s) /* okay, we're really spent. */ | |
| 385 { | |
| 386 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 387 return(retval); | |
| 388 } /* if */ | |
| 389 | |
| 390 while ((!speex->op.e_o_s) && (!speex->have_ogg_packet)) | |
| 391 { | |
| 392 buffer = (Uint8 *) ogg_sync_buffer(&speex->oy, SPEEX_OGG_BUFSIZE); | |
| 393 if (buffer == NULL) goto speex_read_failed; | |
| 394 rc = SDL_RWread(rw, buffer, 1, SPEEX_OGG_BUFSIZE); | |
| 395 if (rc <= 0) goto speex_read_failed; | |
| 396 if (ogg_sync_wrote(&speex->oy, rc) != 0) goto speex_read_failed; | |
| 397 | |
| 398 /* got complete ogg page? */ | |
| 399 if (ogg_sync_pageout(&speex->oy, &speex->og) == 1) | |
| 400 { | |
| 401 if (ogg_stream_pagein(&speex->os, &speex->og) != 0) | |
| 402 goto speex_read_failed; | |
| 403 | |
| 404 /* got complete ogg packet? */ | |
| 405 if (ogg_stream_packetout(&speex->os, &speex->op) == 1) | |
| 406 speex->have_ogg_packet = 1; | |
| 407 } /* if */ | |
| 408 } /* while */ | |
| 409 } /* while */ | |
| 410 | |
| 411 assert(0); /* never hit this. Either return or goto speex_read_failed */ | |
| 412 | |
| 413 speex_read_failed: | |
| 414 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 415 /* !!! FIXME: "i/o error" is better in some situations. */ | |
| 416 BAIL_MACRO("SPEEX: Decoding error", retval); | |
| 417 } /* SPEEX_read */ | |
| 418 | |
| 419 | |
| 420 static int SPEEX_rewind(Sound_Sample *sample) | |
| 421 { | |
| 422 /* !!! FIXME */ return(0); | |
| 423 } /* SPEEX_rewind */ | |
| 424 | |
| 425 | |
| 426 static int SPEEX_seek(Sound_Sample *sample, Uint32 ms) | |
| 427 { | |
| 428 /* !!! FIXME */ return(0); | |
| 429 } /* SPEEX_seek */ | |
| 430 | |
| 431 | |
| 432 #endif /* SOUND_SUPPORTS_SPEEX */ | |
| 433 | |
| 434 /* end of speex.c ... */ | |
| 435 |