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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> |
f8f8039f RK |
37 | |
38 | #include "log.h" | |
39 | #include "syscalls.h" | |
40 | #include "defs.h" | |
ce6c36be | 41 | #include "wav.h" |
39492555 | 42 | #include "speaker-protocol.h" |
f8f8039f RK |
43 | |
44 | /** @brief Encoding lookup table type */ | |
45 | struct decoder { | |
46 | /** @brief Glob pattern matching file */ | |
47 | const char *pattern; | |
48 | /** @brief Decoder function */ | |
49 | void (*decode)(void); | |
50 | }; | |
51 | ||
52 | /** @brief Input file */ | |
53 | static int inputfd; | |
54 | ||
55 | /** @brief Output file */ | |
56 | static FILE *outputfp; | |
57 | ||
58 | /** @brief Filename */ | |
59 | static const char *path; | |
60 | ||
61 | /** @brief Input buffer */ | |
572c2899 | 62 | static char buffer[1048576]; |
f8f8039f RK |
63 | |
64 | /** @brief Open the input file */ | |
65 | static void open_input(void) { | |
66 | if((inputfd = open(path, O_RDONLY)) < 0) | |
67 | fatal(errno, "opening %s", path); | |
68 | } | |
69 | ||
70 | /** @brief Fill the buffer | |
71 | * @return Number of bytes read | |
72 | */ | |
73 | static size_t fill(void) { | |
74 | int n = read(inputfd, buffer, sizeof buffer); | |
75 | ||
76 | if(n < 0) | |
77 | fatal(errno, "reading from %s", path); | |
78 | return n; | |
79 | } | |
80 | ||
81 | /** @brief Write a 16-bit word in bigendian format */ | |
82 | static inline void output_16(uint16_t n) { | |
83 | if(putc(n >> 8, outputfp) < 0 | |
84 | || putc(n & 0xFF, outputfp) < 0) | |
85 | fatal(errno, "decoding %s: output error", path); | |
86 | } | |
87 | ||
88 | /** @brief Write the header | |
89 | * If called more than once, either does nothing (if you kept the same | |
90 | * output encoding) or fails (if you changed it). | |
91 | */ | |
92 | static void output_header(int rate, | |
93 | int channels, | |
39492555 | 94 | int bits, |
ce6c36be | 95 | int nbytes, |
96 | int endian) { | |
39492555 | 97 | struct stream_header header; |
98 | ||
99 | header.rate = rate; | |
100 | header.bits = bits; | |
101 | header.channels = channels; | |
ce6c36be | 102 | header.endian = endian; |
39492555 | 103 | header.nbytes = nbytes; |
104 | if(fwrite(&header, sizeof header, 1, outputfp) < 1) | |
105 | fatal(errno, "decoding %s: writing format header", path); | |
f8f8039f RK |
106 | } |
107 | ||
108 | /** @brief Dithering state | |
109 | * Filched from mpg321, which credits it to Robert Leslie */ | |
110 | struct audio_dither { | |
111 | mad_fixed_t error[3]; | |
112 | mad_fixed_t random; | |
113 | }; | |
114 | ||
115 | /** @brief 32-bit PRNG | |
116 | * Filched from mpg321, which credits it to Robert Leslie */ | |
117 | static inline unsigned long prng(unsigned long state) | |
118 | { | |
119 | return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL; | |
120 | } | |
121 | ||
122 | /** @brief Generic linear sample quantize and dither routine | |
123 | * Filched from mpg321, which credits it to Robert Leslie */ | |
124 | #define bits 16 | |
125 | static long audio_linear_dither(mad_fixed_t sample, | |
126 | struct audio_dither *dither) { | |
127 | unsigned int scalebits; | |
128 | mad_fixed_t output, mask, rnd; | |
129 | ||
130 | enum { | |
131 | MIN = -MAD_F_ONE, | |
132 | MAX = MAD_F_ONE - 1 | |
133 | }; | |
134 | ||
135 | /* noise shape */ | |
136 | sample += dither->error[0] - dither->error[1] + dither->error[2]; | |
137 | ||
138 | dither->error[2] = dither->error[1]; | |
139 | dither->error[1] = dither->error[0] / 2; | |
140 | ||
141 | /* bias */ | |
142 | output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1)); | |
143 | ||
144 | scalebits = MAD_F_FRACBITS + 1 - bits; | |
145 | mask = (1L << scalebits) - 1; | |
146 | ||
147 | /* dither */ | |
148 | rnd = prng(dither->random); | |
149 | output += (rnd & mask) - (dither->random & mask); | |
150 | ||
151 | dither->random = rnd; | |
152 | ||
153 | /* clip */ | |
154 | if (output > MAX) { | |
155 | output = MAX; | |
156 | ||
157 | if (sample > MAX) | |
158 | sample = MAX; | |
159 | } | |
160 | else if (output < MIN) { | |
161 | output = MIN; | |
162 | ||
163 | if (sample < MIN) | |
164 | sample = MIN; | |
165 | } | |
166 | ||
167 | /* quantize */ | |
168 | output &= ~mask; | |
169 | ||
170 | /* error feedback */ | |
171 | dither->error[0] = sample - output; | |
172 | ||
173 | /* scale */ | |
174 | return output >> scalebits; | |
175 | } | |
176 | #undef bits | |
177 | ||
178 | /** @brief MP3 output callback */ | |
179 | static enum mad_flow mp3_output(void attribute((unused)) *data, | |
180 | struct mad_header const *header, | |
181 | struct mad_pcm *pcm) { | |
182 | size_t n = pcm->length; | |
183 | const mad_fixed_t *l = pcm->samples[0], *r = pcm->samples[1]; | |
184 | static struct audio_dither ld[1], rd[1]; | |
185 | ||
186 | output_header(header->samplerate, | |
187 | pcm->channels, | |
39492555 | 188 | 16, |
ce6c36be | 189 | 2 * pcm->channels * pcm->length, |
190 | ENDIAN_BIG); | |
f8f8039f RK |
191 | switch(pcm->channels) { |
192 | case 1: | |
193 | while(n--) | |
194 | output_16(audio_linear_dither(*l++, ld)); | |
195 | break; | |
196 | case 2: | |
197 | while(n--) { | |
198 | output_16(audio_linear_dither(*l++, ld)); | |
199 | output_16(audio_linear_dither(*r++, rd)); | |
200 | } | |
201 | break; | |
202 | default: | |
203 | fatal(0, "decoding %s: unsupported channel count %d", path, pcm->channels); | |
204 | } | |
205 | return MAD_FLOW_CONTINUE; | |
206 | } | |
207 | ||
208 | /** @brief MP3 input callback */ | |
209 | static enum mad_flow mp3_input(void attribute((unused)) *data, | |
210 | struct mad_stream *stream) { | |
211 | const size_t n = fill(); | |
572c2899 | 212 | |
f8f8039f RK |
213 | if(!n) |
214 | return MAD_FLOW_STOP; | |
572c2899 | 215 | mad_stream_buffer(stream, (unsigned char *)buffer, n); |
f8f8039f RK |
216 | return MAD_FLOW_CONTINUE; |
217 | } | |
218 | ||
219 | ||
220 | /** @brief MP3 error callback */ | |
221 | static enum mad_flow mp3_error(void attribute((unused)) *data, | |
222 | struct mad_stream *stream, | |
223 | struct mad_frame attribute((unused)) *frame) { | |
39492555 | 224 | if(0) |
225 | /* Just generates pointless verbosity l-( */ | |
226 | error(0, "decoding %s: %s (%#04x)", | |
227 | path, mad_stream_errorstr(stream), stream->error); | |
f8f8039f RK |
228 | return MAD_FLOW_CONTINUE; |
229 | } | |
230 | ||
231 | /** @brief MP3 decoder */ | |
232 | static void decode_mp3(void) { | |
233 | struct mad_decoder mad[1]; | |
234 | ||
235 | open_input(); | |
39492555 | 236 | mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/, |
f8f8039f RK |
237 | mp3_output, mp3_error, 0/*message*/); |
238 | if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC)) | |
239 | exit(1); | |
240 | mad_decoder_finish(mad); | |
241 | } | |
242 | ||
572c2899 | 243 | /** @brief OGG decoder */ |
244 | static void decode_ogg(void) { | |
245 | FILE *fp; | |
246 | OggVorbis_File vf[1]; | |
247 | int err; | |
248 | long n; | |
249 | int bitstream; | |
250 | vorbis_info *vi; | |
251 | ||
252 | if(!(fp = fopen(path, "rb"))) | |
253 | fatal(errno, "cannot open %s", path); | |
254 | /* There doesn't seem to be any standard function for mapping the error codes | |
255 | * to strings l-( */ | |
256 | if((err = ov_open(fp, vf, 0/*initial*/, 0/*ibytes*/))) | |
257 | fatal(0, "ov_fopen %s: %d", path, err); | |
258 | if(!(vi = ov_info(vf, 0/*link*/))) | |
259 | fatal(0, "ov_info %s: failed", path); | |
260 | while((n = ov_read(vf, buffer, sizeof buffer, 1/*bigendianp*/, | |
261 | 2/*bytes/word*/, 1/*signed*/, &bitstream))) { | |
262 | if(n < 0) | |
263 | fatal(0, "ov_read %s: %ld", path, n); | |
264 | if(bitstream > 0) | |
265 | fatal(0, "only single-bitstream ogg files are supported"); | |
ce6c36be | 266 | output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG); |
572c2899 | 267 | if(fwrite(buffer, 1, n, outputfp) < (size_t)n) |
268 | fatal(errno, "decoding %s: writing sample data", path); | |
269 | } | |
270 | } | |
271 | ||
ce6c36be | 272 | /** @brief Sample data callback used by decode_wav() */ |
273 | static int wav_write(struct wavfile attribute((unused)) *f, | |
274 | const char *data, | |
275 | size_t nbytes, | |
276 | void attribute((unused)) *u) { | |
277 | if(fwrite(data, 1, nbytes, outputfp) < nbytes) | |
278 | fatal(errno, "decoding %s: writing sample data", path); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | /** @brief WAV file decoder */ | |
283 | static void decode_wav(void) { | |
284 | struct wavfile f[1]; | |
285 | int err; | |
286 | ||
287 | if((err = wav_init(f, path))) | |
288 | fatal(err, "opening %s", path); | |
289 | if(f->bits % 8) | |
290 | fatal(err, "%s: unsupported byte size %d", path, f->bits); | |
291 | output_header(f->rate, f->channels, f->bits, f->datasize, ENDIAN_LITTLE); | |
292 | if((err = wav_data(f, wav_write, 0))) | |
293 | fatal(err, "error decoding %s", path); | |
294 | } | |
295 | ||
f8f8039f RK |
296 | /** @brief Lookup table of decoders */ |
297 | static const struct decoder decoders[] = { | |
298 | { "*.mp3", decode_mp3 }, | |
299 | { "*.MP3", decode_mp3 }, | |
572c2899 | 300 | { "*.ogg", decode_ogg }, |
301 | { "*.OGG", decode_ogg }, | |
ce6c36be | 302 | { "*.wav", decode_wav }, |
303 | { "*.WAV", decode_wav }, | |
f8f8039f RK |
304 | { 0, 0 } |
305 | }; | |
306 | ||
307 | static const struct option options[] = { | |
308 | { "help", no_argument, 0, 'h' }, | |
309 | { "version", no_argument, 0, 'V' }, | |
310 | { 0, 0, 0, 0 } | |
311 | }; | |
312 | ||
313 | /* Display usage message and terminate. */ | |
314 | static void help(void) { | |
315 | xprintf("Usage:\n" | |
316 | " disorder-decode [OPTIONS] PATH\n" | |
317 | "Options:\n" | |
318 | " --help, -h Display usage message\n" | |
319 | " --version, -V Display version number\n" | |
320 | "\n" | |
321 | "Audio decoder for DisOrder. Only intended to be used by speaker\n" | |
322 | "process, not for normal users.\n"); | |
323 | xfclose(stdout); | |
324 | exit(0); | |
325 | } | |
326 | ||
327 | /* Display version number and terminate. */ | |
328 | static void version(void) { | |
329 | xprintf("disorder-decode version %s\n", disorder_version_string); | |
330 | xfclose(stdout); | |
331 | exit(0); | |
332 | } | |
333 | ||
334 | int main(int argc, char **argv) { | |
335 | int n; | |
336 | const char *e; | |
337 | ||
338 | set_progname(argv); | |
339 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale"); | |
340 | while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) { | |
341 | switch(n) { | |
342 | case 'h': help(); | |
343 | case 'V': version(); | |
344 | default: fatal(0, "invalid option"); | |
345 | } | |
346 | } | |
347 | if(optind >= argc) | |
348 | fatal(0, "missing filename"); | |
349 | if(optind + 1 < argc) | |
350 | fatal(0, "excess arguments"); | |
351 | if((e = getenv("DISORDER_RAW_FD"))) { | |
352 | if(!(outputfp = fdopen(atoi(e), "wb"))) | |
353 | fatal(errno, "fdopen"); | |
354 | } else | |
355 | outputfp = stdout; | |
356 | path = argv[optind]; | |
357 | for(n = 0; | |
358 | decoders[n].pattern | |
359 | && fnmatch(decoders[n].pattern, path, 0) != 0; | |
360 | ++n) | |
361 | ; | |
362 | if(!decoders[n].pattern) | |
363 | fatal(0, "cannot determine file type for %s", path); | |
364 | decoders[n].decode(); | |
365 | xfclose(outputfp); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | /* | |
370 | Local Variables: | |
371 | c-basic-offset:2 | |
372 | comment-column:40 | |
373 | fill-column:79 | |
374 | indent-tabs-mode:nil | |
375 | End: | |
376 | */ |