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f8f8039f RK |
1 | /* |
2 | * This file is part of DisOrder | |
3 | * Copyright (C) 2007 Richard Kettlewell | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | /** @file server/decode.c | |
21 | * @brief General-purpose decoder for use by speaker process | |
22 | */ | |
23 | ||
24 | #include <config.h> | |
25 | #include "types.h" | |
26 | ||
27 | #include <getopt.h> | |
28 | #include <unistd.h> | |
29 | #include <fcntl.h> | |
30 | #include <errno.h> | |
31 | #include <stdlib.h> | |
32 | #include <locale.h> | |
33 | #include <assert.h> | |
34 | #include <fnmatch.h> | |
35 | #include <mad.h> | |
572c2899 | 36 | #include <vorbis/vorbisfile.h> |
75db8354 | 37 | #include <FLAC/file_decoder.h> |
f8f8039f RK |
38 | |
39 | #include "log.h" | |
40 | #include "syscalls.h" | |
41 | #include "defs.h" | |
ce6c36be | 42 | #include "wav.h" |
39492555 | 43 | #include "speaker-protocol.h" |
f8f8039f RK |
44 | |
45 | /** @brief Encoding lookup table type */ | |
46 | struct decoder { | |
47 | /** @brief Glob pattern matching file */ | |
48 | const char *pattern; | |
49 | /** @brief Decoder function */ | |
50 | void (*decode)(void); | |
51 | }; | |
52 | ||
53 | /** @brief Input file */ | |
54 | static int inputfd; | |
55 | ||
56 | /** @brief Output file */ | |
57 | static FILE *outputfp; | |
58 | ||
59 | /** @brief Filename */ | |
60 | static const char *path; | |
61 | ||
62 | /** @brief Input buffer */ | |
75db8354 | 63 | static char input_buffer[1048576]; |
f8f8039f RK |
64 | |
65 | /** @brief Open the input file */ | |
66 | static void open_input(void) { | |
67 | if((inputfd = open(path, O_RDONLY)) < 0) | |
68 | fatal(errno, "opening %s", path); | |
69 | } | |
70 | ||
71 | /** @brief Fill the buffer | |
72 | * @return Number of bytes read | |
73 | */ | |
74 | static size_t fill(void) { | |
75db8354 | 75 | int n = read(inputfd, input_buffer, sizeof input_buffer); |
f8f8039f RK |
76 | |
77 | if(n < 0) | |
78 | fatal(errno, "reading from %s", path); | |
79 | return n; | |
80 | } | |
81 | ||
75db8354 | 82 | /** @brief Write an 8-bit word */ |
83 | static inline void output_8(int n) { | |
84 | if(putc(n, outputfp) < 0) | |
85 | fatal(errno, "decoding %s: output error", path); | |
86 | } | |
87 | ||
f8f8039f RK |
88 | /** @brief Write a 16-bit word in bigendian format */ |
89 | static inline void output_16(uint16_t n) { | |
90 | if(putc(n >> 8, outputfp) < 0 | |
75db8354 | 91 | || putc(n, outputfp) < 0) |
92 | fatal(errno, "decoding %s: output error", path); | |
93 | } | |
94 | ||
95 | /** @brief Write a 24-bit word in bigendian format */ | |
96 | static inline void output_24(uint32_t n) { | |
97 | if(putc(n >> 16, outputfp) < 0 | |
98 | || putc(n >> 8, outputfp) < 0 | |
99 | || putc(n, outputfp) < 0) | |
f8f8039f RK |
100 | fatal(errno, "decoding %s: output error", path); |
101 | } | |
102 | ||
75db8354 | 103 | /** @brief Write a 32-bit word in bigendian format */ |
104 | static inline void output_32(uint32_t n) { | |
105 | if(putc(n >> 24, outputfp) < 0 | |
106 | || putc(n >> 16, outputfp) < 0 | |
107 | || putc(n >> 8, outputfp) < 0 | |
108 | || putc(n, outputfp) < 0) | |
109 | fatal(errno, "decoding %s: output error", path); | |
110 | } | |
111 | ||
112 | /** @brief Write a block header | |
113 | * @param rate Sample rate in Hz | |
114 | * @param channels Channel count (currently only 1 or 2 supported) | |
115 | * @param bits Bits per sample (must be a multiple of 8, no more than 64) | |
116 | * @param nbytes Total number of data bytes | |
117 | * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE | |
118 | * | |
119 | * Checks that the sample format is a supported one (so other calls do not have | |
120 | * to) and calls fatal() on error. | |
f8f8039f RK |
121 | */ |
122 | static void output_header(int rate, | |
123 | int channels, | |
39492555 | 124 | int bits, |
ce6c36be | 125 | int nbytes, |
126 | int endian) { | |
39492555 | 127 | struct stream_header header; |
128 | ||
75db8354 | 129 | if(bits <= 0 || bits % 8 || bits > 64) |
130 | fatal(0, "decoding %s: unsupported sample size %d bits", path, bits); | |
131 | if(channels <= 0 || channels > 2) | |
132 | fatal(0, "decoding %s: unsupported channel count %d", path, channels); | |
133 | if(rate <= 0) | |
134 | fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate); | |
39492555 | 135 | header.rate = rate; |
136 | header.bits = bits; | |
137 | header.channels = channels; | |
ce6c36be | 138 | header.endian = endian; |
39492555 | 139 | header.nbytes = nbytes; |
140 | if(fwrite(&header, sizeof header, 1, outputfp) < 1) | |
141 | fatal(errno, "decoding %s: writing format header", path); | |
f8f8039f RK |
142 | } |
143 | ||
144 | /** @brief Dithering state | |
145 | * Filched from mpg321, which credits it to Robert Leslie */ | |
146 | struct audio_dither { | |
147 | mad_fixed_t error[3]; | |
148 | mad_fixed_t random; | |
149 | }; | |
150 | ||
151 | /** @brief 32-bit PRNG | |
152 | * Filched from mpg321, which credits it to Robert Leslie */ | |
153 | static inline unsigned long prng(unsigned long state) | |
154 | { | |
155 | return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; | |
156 | } | |
157 | ||
158 | /** @brief Generic linear sample quantize and dither routine | |
159 | * Filched from mpg321, which credits it to Robert Leslie */ | |
160 | #define bits 16 | |
161 | static long audio_linear_dither(mad_fixed_t sample, | |
162 | struct audio_dither *dither) { | |
163 | unsigned int scalebits; | |
164 | mad_fixed_t output, mask, rnd; | |
165 | ||
166 | enum { | |
167 | MIN = -MAD_F_ONE, | |
168 | MAX = MAD_F_ONE - 1 | |
169 | }; | |
170 | ||
171 | /* noise shape */ | |
172 | sample += dither->error[0] - dither->error[1] + dither->error[2]; | |
173 | ||
174 | dither->error[2] = dither->error[1]; | |
175 | dither->error[1] = dither->error[0] / 2; | |
176 | ||
177 | /* bias */ | |
178 | output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1)); | |
179 | ||
180 | scalebits = MAD_F_FRACBITS + 1 - bits; | |
181 | mask = (1L << scalebits) - 1; | |
182 | ||
183 | /* dither */ | |
184 | rnd = prng(dither->random); | |
185 | output += (rnd & mask) - (dither->random & mask); | |
186 | ||
187 | dither->random = rnd; | |
188 | ||
189 | /* clip */ | |
190 | if (output > MAX) { | |
191 | output = MAX; | |
192 | ||
193 | if (sample > MAX) | |
194 | sample = MAX; | |
195 | } | |
196 | else if (output < MIN) { | |
197 | output = MIN; | |
198 | ||
199 | if (sample < MIN) | |
200 | sample = MIN; | |
201 | } | |
202 | ||
203 | /* quantize */ | |
204 | output &= ~mask; | |
205 | ||
206 | /* error feedback */ | |
207 | dither->error[0] = sample - output; | |
208 | ||
209 | /* scale */ | |
210 | return output >> scalebits; | |
211 | } | |
212 | #undef bits | |
213 | ||
214 | /** @brief MP3 output callback */ | |
215 | static enum mad_flow mp3_output(void attribute((unused)) *data, | |
216 | struct mad_header const *header, | |
217 | struct mad_pcm *pcm) { | |
218 | size_t n = pcm->length; | |
219 | const mad_fixed_t *l = pcm->samples[0], *r = pcm->samples[1]; | |
220 | static struct audio_dither ld[1], rd[1]; | |
221 | ||
222 | output_header(header->samplerate, | |
223 | pcm->channels, | |
39492555 | 224 | 16, |
ce6c36be | 225 | 2 * pcm->channels * pcm->length, |
226 | ENDIAN_BIG); | |
f8f8039f RK |
227 | switch(pcm->channels) { |
228 | case 1: | |
229 | while(n--) | |
230 | output_16(audio_linear_dither(*l++, ld)); | |
231 | break; | |
232 | case 2: | |
233 | while(n--) { | |
234 | output_16(audio_linear_dither(*l++, ld)); | |
235 | output_16(audio_linear_dither(*r++, rd)); | |
236 | } | |
237 | break; | |
f8f8039f RK |
238 | } |
239 | return MAD_FLOW_CONTINUE; | |
240 | } | |
241 | ||
242 | /** @brief MP3 input callback */ | |
243 | static enum mad_flow mp3_input(void attribute((unused)) *data, | |
244 | struct mad_stream *stream) { | |
245 | const size_t n = fill(); | |
572c2899 | 246 | |
f8f8039f RK |
247 | if(!n) |
248 | return MAD_FLOW_STOP; | |
75db8354 | 249 | mad_stream_buffer(stream, (unsigned char *)input_buffer, n); |
f8f8039f RK |
250 | return MAD_FLOW_CONTINUE; |
251 | } | |
252 | ||
253 | ||
254 | /** @brief MP3 error callback */ | |
255 | static enum mad_flow mp3_error(void attribute((unused)) *data, | |
256 | struct mad_stream *stream, | |
257 | struct mad_frame attribute((unused)) *frame) { | |
39492555 | 258 | if(0) |
259 | /* Just generates pointless verbosity l-( */ | |
260 | error(0, "decoding %s: %s (%#04x)", | |
261 | path, mad_stream_errorstr(stream), stream->error); | |
f8f8039f RK |
262 | return MAD_FLOW_CONTINUE; |
263 | } | |
264 | ||
265 | /** @brief MP3 decoder */ | |
266 | static void decode_mp3(void) { | |
267 | struct mad_decoder mad[1]; | |
268 | ||
269 | open_input(); | |
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) { | |
375 | FLAC__FileDecoder *fd = 0; | |
376 | FLAC__FileDecoderState fs; | |
377 | ||
378 | if(!(fd = FLAC__file_decoder_new())) | |
379 | fatal(0, "FLAC__file_decoder_new failed"); | |
380 | if(!(FLAC__file_decoder_set_filename(fd, path))) | |
381 | fatal(0, "FLAC__file_set_filename failed"); | |
382 | FLAC__file_decoder_set_metadata_callback(fd, flac_metadata); | |
383 | FLAC__file_decoder_set_error_callback(fd, flac_error); | |
384 | FLAC__file_decoder_set_write_callback(fd, flac_write); | |
385 | if((fs = FLAC__file_decoder_init(fd))) | |
386 | fatal(0, "FLAC__file_decoder_init: %s", FLAC__FileDecoderStateString[fs]); | |
387 | FLAC__file_decoder_process_until_end_of_file(fd); | |
388 | } | |
389 | ||
f8f8039f RK |
390 | /** @brief Lookup table of decoders */ |
391 | static const struct decoder decoders[] = { | |
392 | { "*.mp3", decode_mp3 }, | |
393 | { "*.MP3", decode_mp3 }, | |
572c2899 | 394 | { "*.ogg", decode_ogg }, |
395 | { "*.OGG", decode_ogg }, | |
75db8354 | 396 | { "*.flac", decode_flac }, |
397 | { "*.FLAC", decode_flac }, | |
ce6c36be | 398 | { "*.wav", decode_wav }, |
399 | { "*.WAV", decode_wav }, | |
f8f8039f RK |
400 | { 0, 0 } |
401 | }; | |
402 | ||
403 | static const struct option options[] = { | |
404 | { "help", no_argument, 0, 'h' }, | |
405 | { "version", no_argument, 0, 'V' }, | |
406 | { 0, 0, 0, 0 } | |
407 | }; | |
408 | ||
409 | /* Display usage message and terminate. */ | |
410 | static void help(void) { | |
411 | xprintf("Usage:\n" | |
412 | " disorder-decode [OPTIONS] PATH\n" | |
413 | "Options:\n" | |
414 | " --help, -h Display usage message\n" | |
415 | " --version, -V Display version number\n" | |
416 | "\n" | |
417 | "Audio decoder for DisOrder. Only intended to be used by speaker\n" | |
418 | "process, not for normal users.\n"); | |
419 | xfclose(stdout); | |
420 | exit(0); | |
421 | } | |
422 | ||
423 | /* Display version number and terminate. */ | |
424 | static void version(void) { | |
425 | xprintf("disorder-decode version %s\n", disorder_version_string); | |
426 | xfclose(stdout); | |
427 | exit(0); | |
428 | } | |
429 | ||
430 | int main(int argc, char **argv) { | |
431 | int n; | |
432 | const char *e; | |
433 | ||
434 | set_progname(argv); | |
435 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale"); | |
436 | while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) { | |
437 | switch(n) { | |
438 | case 'h': help(); | |
439 | case 'V': version(); | |
440 | default: fatal(0, "invalid option"); | |
441 | } | |
442 | } | |
443 | if(optind >= argc) | |
444 | fatal(0, "missing filename"); | |
445 | if(optind + 1 < argc) | |
446 | fatal(0, "excess arguments"); | |
447 | if((e = getenv("DISORDER_RAW_FD"))) { | |
448 | if(!(outputfp = fdopen(atoi(e), "wb"))) | |
449 | fatal(errno, "fdopen"); | |
450 | } else | |
451 | outputfp = stdout; | |
452 | path = argv[optind]; | |
453 | for(n = 0; | |
454 | decoders[n].pattern | |
455 | && fnmatch(decoders[n].pattern, path, 0) != 0; | |
456 | ++n) | |
457 | ; | |
458 | if(!decoders[n].pattern) | |
459 | fatal(0, "cannot determine file type for %s", path); | |
460 | decoders[n].decode(); | |
461 | xfclose(outputfp); | |
462 | return 0; | |
463 | } | |
464 | ||
465 | /* | |
466 | Local Variables: | |
467 | c-basic-offset:2 | |
468 | comment-column:40 | |
469 | fill-column:79 | |
470 | indent-tabs-mode:nil | |
471 | End: | |
472 | */ |