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f8f8039f RK |
1 | /* |
2 | * This file is part of DisOrder | |
5aff007d | 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
f8f8039f | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
f8f8039f | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
f8f8039f RK |
8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
10 | * This program 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 | |
13 | * GNU General Public License for more details. | |
14 | * | |
f8f8039f | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
f8f8039f RK |
17 | */ |
18 | /** @file server/decode.c | |
19 | * @brief General-purpose decoder for use by speaker process | |
20 | */ | |
21 | ||
05b75f8d | 22 | #include "disorder-server.h" |
f8f8039f | 23 | |
f8f8039f | 24 | #include <mad.h> |
572c2899 | 25 | #include <vorbis/vorbisfile.h> |
762806f1 RK |
26 | |
27 | /* libFLAC has had an API change and stupidly taken away the old API */ | |
28 | #if HAVE_FLAC_FILE_DECODER_H | |
29 | # include <FLAC/file_decoder.h> | |
30 | #else | |
31 | # include <FLAC/stream_decoder.h> | |
32 | #define FLAC__FileDecoder FLAC__StreamDecoder | |
33 | #define FLAC__FileDecoderState FLAC__StreamDecoderState | |
34 | #endif | |
f8f8039f | 35 | |
ce6c36be | 36 | #include "wav.h" |
39492555 | 37 | #include "speaker-protocol.h" |
f8f8039f | 38 | |
e7eb3a27 | 39 | |
f8f8039f RK |
40 | /** @brief Encoding lookup table type */ |
41 | struct decoder { | |
42 | /** @brief Glob pattern matching file */ | |
43 | const char *pattern; | |
44 | /** @brief Decoder function */ | |
45 | void (*decode)(void); | |
46 | }; | |
47 | ||
48 | /** @brief Input file */ | |
49 | static int inputfd; | |
50 | ||
51 | /** @brief Output file */ | |
52 | static FILE *outputfp; | |
53 | ||
54 | /** @brief Filename */ | |
55 | static const char *path; | |
56 | ||
57 | /** @brief Input buffer */ | |
75db8354 | 58 | static char input_buffer[1048576]; |
f8f8039f | 59 | |
87b5259b | 60 | /** @brief Number of bytes read into buffer */ |
61 | static int input_count; | |
f8f8039f | 62 | |
75db8354 | 63 | /** @brief Write an 8-bit word */ |
64 | static inline void output_8(int n) { | |
65 | if(putc(n, outputfp) < 0) | |
66 | fatal(errno, "decoding %s: output error", path); | |
67 | } | |
68 | ||
f8f8039f RK |
69 | /** @brief Write a 16-bit word in bigendian format */ |
70 | static inline void output_16(uint16_t n) { | |
71 | if(putc(n >> 8, outputfp) < 0 | |
75db8354 | 72 | || putc(n, outputfp) < 0) |
73 | fatal(errno, "decoding %s: output error", path); | |
74 | } | |
75 | ||
76 | /** @brief Write a 24-bit word in bigendian format */ | |
77 | static inline void output_24(uint32_t n) { | |
78 | if(putc(n >> 16, outputfp) < 0 | |
79 | || putc(n >> 8, outputfp) < 0 | |
80 | || putc(n, outputfp) < 0) | |
f8f8039f RK |
81 | fatal(errno, "decoding %s: output error", path); |
82 | } | |
83 | ||
75db8354 | 84 | /** @brief Write a 32-bit word in bigendian format */ |
85 | static inline void output_32(uint32_t n) { | |
86 | if(putc(n >> 24, outputfp) < 0 | |
87 | || putc(n >> 16, outputfp) < 0 | |
88 | || putc(n >> 8, outputfp) < 0 | |
89 | || putc(n, outputfp) < 0) | |
90 | fatal(errno, "decoding %s: output error", path); | |
91 | } | |
92 | ||
93 | /** @brief Write a block header | |
94 | * @param rate Sample rate in Hz | |
95 | * @param channels Channel count (currently only 1 or 2 supported) | |
96 | * @param bits Bits per sample (must be a multiple of 8, no more than 64) | |
97 | * @param nbytes Total number of data bytes | |
98 | * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE | |
99 | * | |
100 | * Checks that the sample format is a supported one (so other calls do not have | |
101 | * to) and calls fatal() on error. | |
f8f8039f RK |
102 | */ |
103 | static void output_header(int rate, | |
104 | int channels, | |
39492555 | 105 | int bits, |
ce6c36be | 106 | int nbytes, |
107 | int endian) { | |
39492555 | 108 | struct stream_header header; |
109 | ||
75db8354 | 110 | if(bits <= 0 || bits % 8 || bits > 64) |
111 | fatal(0, "decoding %s: unsupported sample size %d bits", path, bits); | |
112 | if(channels <= 0 || channels > 2) | |
113 | fatal(0, "decoding %s: unsupported channel count %d", path, channels); | |
114 | if(rate <= 0) | |
115 | fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate); | |
39492555 | 116 | header.rate = rate; |
117 | header.bits = bits; | |
118 | header.channels = channels; | |
ce6c36be | 119 | header.endian = endian; |
39492555 | 120 | header.nbytes = nbytes; |
121 | if(fwrite(&header, sizeof header, 1, outputfp) < 1) | |
122 | fatal(errno, "decoding %s: writing format header", path); | |
f8f8039f RK |
123 | } |
124 | ||
125 | /** @brief Dithering state | |
126 | * Filched from mpg321, which credits it to Robert Leslie */ | |
127 | struct audio_dither { | |
128 | mad_fixed_t error[3]; | |
129 | mad_fixed_t random; | |
130 | }; | |
131 | ||
132 | /** @brief 32-bit PRNG | |
133 | * Filched from mpg321, which credits it to Robert Leslie */ | |
134 | static inline unsigned long prng(unsigned long state) | |
135 | { | |
136 | return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; | |
137 | } | |
138 | ||
139 | /** @brief Generic linear sample quantize and dither routine | |
140 | * Filched from mpg321, which credits it to Robert Leslie */ | |
f8f8039f RK |
141 | static long audio_linear_dither(mad_fixed_t sample, |
142 | struct audio_dither *dither) { | |
143 | unsigned int scalebits; | |
144 | mad_fixed_t output, mask, rnd; | |
87b5259b | 145 | const int bits = 16; |
f8f8039f RK |
146 | |
147 | enum { | |
148 | MIN = -MAD_F_ONE, | |
149 | MAX = MAD_F_ONE - 1 | |
150 | }; | |
151 | ||
152 | /* noise shape */ | |
153 | sample += dither->error[0] - dither->error[1] + dither->error[2]; | |
154 | ||
155 | dither->error[2] = dither->error[1]; | |
156 | dither->error[1] = dither->error[0] / 2; | |
157 | ||
158 | /* bias */ | |
159 | output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1)); | |
160 | ||
161 | scalebits = MAD_F_FRACBITS + 1 - bits; | |
162 | mask = (1L << scalebits) - 1; | |
163 | ||
164 | /* dither */ | |
165 | rnd = prng(dither->random); | |
166 | output += (rnd & mask) - (dither->random & mask); | |
167 | ||
168 | dither->random = rnd; | |
169 | ||
170 | /* clip */ | |
171 | if (output > MAX) { | |
172 | output = MAX; | |
173 | ||
174 | if (sample > MAX) | |
175 | sample = MAX; | |
176 | } | |
177 | else if (output < MIN) { | |
178 | output = MIN; | |
179 | ||
180 | if (sample < MIN) | |
181 | sample = MIN; | |
182 | } | |
183 | ||
184 | /* quantize */ | |
185 | output &= ~mask; | |
186 | ||
187 | /* error feedback */ | |
188 | dither->error[0] = sample - output; | |
189 | ||
190 | /* scale */ | |
191 | return output >> scalebits; | |
192 | } | |
f8f8039f RK |
193 | |
194 | /** @brief MP3 output callback */ | |
195 | static enum mad_flow mp3_output(void attribute((unused)) *data, | |
196 | struct mad_header const *header, | |
197 | struct mad_pcm *pcm) { | |
198 | size_t n = pcm->length; | |
199 | const mad_fixed_t *l = pcm->samples[0], *r = pcm->samples[1]; | |
200 | static struct audio_dither ld[1], rd[1]; | |
201 | ||
202 | output_header(header->samplerate, | |
203 | pcm->channels, | |
39492555 | 204 | 16, |
ce6c36be | 205 | 2 * pcm->channels * pcm->length, |
206 | ENDIAN_BIG); | |
f8f8039f RK |
207 | switch(pcm->channels) { |
208 | case 1: | |
209 | while(n--) | |
210 | output_16(audio_linear_dither(*l++, ld)); | |
211 | break; | |
212 | case 2: | |
213 | while(n--) { | |
214 | output_16(audio_linear_dither(*l++, ld)); | |
215 | output_16(audio_linear_dither(*r++, rd)); | |
216 | } | |
217 | break; | |
f8f8039f RK |
218 | } |
219 | return MAD_FLOW_CONTINUE; | |
220 | } | |
221 | ||
222 | /** @brief MP3 input callback */ | |
223 | static enum mad_flow mp3_input(void attribute((unused)) *data, | |
224 | struct mad_stream *stream) { | |
87b5259b | 225 | int used, remain, n; |
226 | ||
227 | /* libmad requires its caller to do ALL the buffering work, including coping | |
228 | * with partial frames. Given that it appears to be completely undocumented | |
229 | * you could perhaps be forgiven for not discovering this... */ | |
230 | if(input_count) { | |
231 | /* Compute total number of bytes consumed */ | |
232 | used = (char *)stream->next_frame - input_buffer; | |
233 | /* Compute number of bytes left to consume */ | |
234 | remain = input_count - used; | |
235 | memmove(input_buffer, input_buffer + used, remain); | |
236 | } else { | |
237 | remain = 0; | |
238 | } | |
239 | /* Read new data */ | |
240 | n = read(inputfd, input_buffer + remain, (sizeof input_buffer) - remain); | |
241 | if(n < 0) | |
242 | fatal(errno, "reading from %s", path); | |
243 | /* Compute total number of bytes available */ | |
244 | input_count = remain + n; | |
245 | if(input_count) | |
246 | mad_stream_buffer(stream, (unsigned char *)input_buffer, input_count); | |
247 | if(n) | |
248 | return MAD_FLOW_CONTINUE; | |
249 | else | |
f8f8039f | 250 | return MAD_FLOW_STOP; |
f8f8039f RK |
251 | } |
252 | ||
f8f8039f RK |
253 | /** @brief MP3 error callback */ |
254 | static enum mad_flow mp3_error(void attribute((unused)) *data, | |
255 | struct mad_stream *stream, | |
256 | struct mad_frame attribute((unused)) *frame) { | |
39492555 | 257 | if(0) |
258 | /* Just generates pointless verbosity l-( */ | |
259 | error(0, "decoding %s: %s (%#04x)", | |
260 | path, mad_stream_errorstr(stream), stream->error); | |
f8f8039f RK |
261 | return MAD_FLOW_CONTINUE; |
262 | } | |
263 | ||
264 | /** @brief MP3 decoder */ | |
265 | static void decode_mp3(void) { | |
266 | struct mad_decoder mad[1]; | |
267 | ||
87b5259b | 268 | if((inputfd = open(path, O_RDONLY)) < 0) |
269 | fatal(errno, "opening %s", path); | |
39492555 | 270 | mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/, |
f8f8039f RK |
271 | mp3_output, mp3_error, 0/*message*/); |
272 | if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC)) | |
273 | exit(1); | |
274 | mad_decoder_finish(mad); | |
275 | } | |
276 | ||
572c2899 | 277 | /** @brief OGG decoder */ |
278 | static void decode_ogg(void) { | |
279 | FILE *fp; | |
280 | OggVorbis_File vf[1]; | |
281 | int err; | |
282 | long n; | |
283 | int bitstream; | |
284 | vorbis_info *vi; | |
285 | ||
286 | if(!(fp = fopen(path, "rb"))) | |
287 | fatal(errno, "cannot open %s", path); | |
288 | /* There doesn't seem to be any standard function for mapping the error codes | |
289 | * to strings l-( */ | |
290 | if((err = ov_open(fp, vf, 0/*initial*/, 0/*ibytes*/))) | |
291 | fatal(0, "ov_fopen %s: %d", path, err); | |
292 | if(!(vi = ov_info(vf, 0/*link*/))) | |
293 | fatal(0, "ov_info %s: failed", path); | |
75db8354 | 294 | while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/, |
572c2899 | 295 | 2/*bytes/word*/, 1/*signed*/, &bitstream))) { |
296 | if(n < 0) | |
297 | fatal(0, "ov_read %s: %ld", path, n); | |
298 | if(bitstream > 0) | |
299 | fatal(0, "only single-bitstream ogg files are supported"); | |
ce6c36be | 300 | output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG); |
75db8354 | 301 | if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n) |
572c2899 | 302 | fatal(errno, "decoding %s: writing sample data", path); |
303 | } | |
304 | } | |
305 | ||
ce6c36be | 306 | /** @brief Sample data callback used by decode_wav() */ |
307 | static int wav_write(struct wavfile attribute((unused)) *f, | |
308 | const char *data, | |
309 | size_t nbytes, | |
310 | void attribute((unused)) *u) { | |
311 | if(fwrite(data, 1, nbytes, outputfp) < nbytes) | |
312 | fatal(errno, "decoding %s: writing sample data", path); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /** @brief WAV file decoder */ | |
317 | static void decode_wav(void) { | |
318 | struct wavfile f[1]; | |
319 | int err; | |
320 | ||
321 | if((err = wav_init(f, path))) | |
322 | fatal(err, "opening %s", path); | |
ce6c36be | 323 | output_header(f->rate, f->channels, f->bits, f->datasize, ENDIAN_LITTLE); |
324 | if((err = wav_data(f, wav_write, 0))) | |
325 | fatal(err, "error decoding %s", path); | |
326 | } | |
327 | ||
75db8354 | 328 | /** @brief Metadata callback for FLAC decoder |
329 | * | |
330 | * This is a no-op here. | |
331 | */ | |
332 | static void flac_metadata(const FLAC__FileDecoder attribute((unused)) *decoder, | |
333 | const FLAC__StreamMetadata attribute((unused)) *metadata, | |
334 | void attribute((unused)) *client_data) { | |
335 | } | |
336 | ||
337 | /** @brief Error callback for FLAC decoder */ | |
338 | static void flac_error(const FLAC__FileDecoder attribute((unused)) *decoder, | |
339 | FLAC__StreamDecoderErrorStatus status, | |
340 | void attribute((unused)) *client_data) { | |
341 | fatal(0, "error decoding %s: %s", path, | |
342 | FLAC__StreamDecoderErrorStatusString[status]); | |
343 | } | |
344 | ||
345 | /** @brief Write callback for FLAC decoder */ | |
346 | static FLAC__StreamDecoderWriteStatus flac_write | |
347 | (const FLAC__FileDecoder attribute((unused)) *decoder, | |
348 | const FLAC__Frame *frame, | |
349 | const FLAC__int32 *const buffer[], | |
350 | void attribute((unused)) *client_data) { | |
351 | size_t n, c; | |
352 | ||
353 | output_header(frame->header.sample_rate, | |
354 | frame->header.channels, | |
355 | frame->header.bits_per_sample, | |
356 | (frame->header.channels * frame->header.blocksize | |
357 | * frame->header.bits_per_sample) / 8, | |
358 | ENDIAN_BIG); | |
359 | for(n = 0; n < frame->header.blocksize; ++n) { | |
360 | for(c = 0; c < frame->header.channels; ++c) { | |
361 | switch(frame->header.bits_per_sample) { | |
362 | case 8: output_8(buffer[c][n]); break; | |
363 | case 16: output_16(buffer[c][n]); break; | |
364 | case 24: output_24(buffer[c][n]); break; | |
365 | case 32: output_32(buffer[c][n]); break; | |
366 | } | |
367 | } | |
368 | } | |
369 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; | |
370 | } | |
371 | ||
372 | ||
373 | /** @brief FLAC file decoder */ | |
374 | static void decode_flac(void) { | |
762806f1 | 375 | #if HAVE_FLAC_FILE_DECODER_H |
75db8354 | 376 | FLAC__FileDecoder *fd = 0; |
377 | FLAC__FileDecoderState fs; | |
378 | ||
379 | if(!(fd = FLAC__file_decoder_new())) | |
380 | fatal(0, "FLAC__file_decoder_new failed"); | |
381 | if(!(FLAC__file_decoder_set_filename(fd, path))) | |
382 | fatal(0, "FLAC__file_set_filename failed"); | |
383 | FLAC__file_decoder_set_metadata_callback(fd, flac_metadata); | |
384 | FLAC__file_decoder_set_error_callback(fd, flac_error); | |
385 | FLAC__file_decoder_set_write_callback(fd, flac_write); | |
386 | if((fs = FLAC__file_decoder_init(fd))) | |
387 | fatal(0, "FLAC__file_decoder_init: %s", FLAC__FileDecoderStateString[fs]); | |
388 | FLAC__file_decoder_process_until_end_of_file(fd); | |
762806f1 RK |
389 | #else |
390 | FLAC__StreamDecoder *sd = 0; | |
391 | FLAC__StreamDecoderInitStatus is; | |
392 | ||
393 | if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata, | |
394 | flac_error, 0))) | |
395 | fatal(0, "FLAC__stream_decoder_init_file %s: %s", | |
396 | path, FLAC__StreamDecoderInitStatusString[is]); | |
397 | #endif | |
75db8354 | 398 | } |
399 | ||
f8f8039f RK |
400 | /** @brief Lookup table of decoders */ |
401 | static const struct decoder decoders[] = { | |
402 | { "*.mp3", decode_mp3 }, | |
403 | { "*.MP3", decode_mp3 }, | |
572c2899 | 404 | { "*.ogg", decode_ogg }, |
405 | { "*.OGG", decode_ogg }, | |
75db8354 | 406 | { "*.flac", decode_flac }, |
407 | { "*.FLAC", decode_flac }, | |
ce6c36be | 408 | { "*.wav", decode_wav }, |
409 | { "*.WAV", decode_wav }, | |
f8f8039f RK |
410 | { 0, 0 } |
411 | }; | |
412 | ||
413 | static const struct option options[] = { | |
414 | { "help", no_argument, 0, 'h' }, | |
415 | { "version", no_argument, 0, 'V' }, | |
416 | { 0, 0, 0, 0 } | |
417 | }; | |
418 | ||
419 | /* Display usage message and terminate. */ | |
420 | static void help(void) { | |
421 | xprintf("Usage:\n" | |
422 | " disorder-decode [OPTIONS] PATH\n" | |
423 | "Options:\n" | |
424 | " --help, -h Display usage message\n" | |
425 | " --version, -V Display version number\n" | |
426 | "\n" | |
427 | "Audio decoder for DisOrder. Only intended to be used by speaker\n" | |
428 | "process, not for normal users.\n"); | |
429 | xfclose(stdout); | |
430 | exit(0); | |
431 | } | |
432 | ||
f8f8039f RK |
433 | int main(int argc, char **argv) { |
434 | int n; | |
435 | const char *e; | |
436 | ||
437 | set_progname(argv); | |
438 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale"); | |
439 | while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) { | |
440 | switch(n) { | |
441 | case 'h': help(); | |
3fbdc96d | 442 | case 'V': version("disorder-decode"); |
f8f8039f RK |
443 | default: fatal(0, "invalid option"); |
444 | } | |
445 | } | |
446 | if(optind >= argc) | |
447 | fatal(0, "missing filename"); | |
448 | if(optind + 1 < argc) | |
449 | fatal(0, "excess arguments"); | |
450 | if((e = getenv("DISORDER_RAW_FD"))) { | |
451 | if(!(outputfp = fdopen(atoi(e), "wb"))) | |
452 | fatal(errno, "fdopen"); | |
453 | } else | |
454 | outputfp = stdout; | |
455 | path = argv[optind]; | |
456 | for(n = 0; | |
457 | decoders[n].pattern | |
458 | && fnmatch(decoders[n].pattern, path, 0) != 0; | |
459 | ++n) | |
460 | ; | |
461 | if(!decoders[n].pattern) | |
462 | fatal(0, "cannot determine file type for %s", path); | |
463 | decoders[n].decode(); | |
464 | xfclose(outputfp); | |
465 | return 0; | |
466 | } | |
467 | ||
468 | /* | |
469 | Local Variables: | |
470 | c-basic-offset:2 | |
471 | comment-column:40 | |
472 | fill-column:79 | |
473 | indent-tabs-mode:nil | |
474 | End: | |
475 | */ |