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