2 * This file is part of DisOrder
3 * Copyright (C) 2007, 2008 Richard Kettlewell
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.
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.
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
20 /** @file server/decode.c
21 * @brief General-purpose decoder for use by speaker process
24 #include "disorder-server.h"
27 #include <vorbis/vorbisfile.h>
29 /* libFLAC has had an API change and stupidly taken away the old API */
30 #if HAVE_FLAC_FILE_DECODER_H
31 # include <FLAC/file_decoder.h>
33 # include <FLAC/stream_decoder.h>
34 #define FLAC__FileDecoder FLAC__StreamDecoder
35 #define FLAC__FileDecoderState FLAC__StreamDecoderState
39 #include "speaker-protocol.h"
41 /** @brief Encoding lookup table type */
43 /** @brief Glob pattern matching file */
45 /** @brief Decoder function */
49 /** @brief Input file */
52 /** @brief Output file */
53 static FILE *outputfp;
55 /** @brief Filename */
56 static const char *path;
58 /** @brief Input buffer */
59 static char input_buffer[1048576];
61 /** @brief Number of bytes read into buffer */
62 static int input_count;
64 /** @brief Write an 8-bit word */
65 static inline void output_8(int n) {
66 if(putc(n, outputfp) < 0)
67 fatal(errno, "decoding %s: output error", path);
70 /** @brief Write a 16-bit word in bigendian format */
71 static inline void output_16(uint16_t n) {
72 if(putc(n >> 8, outputfp) < 0
73 || putc(n, outputfp) < 0)
74 fatal(errno, "decoding %s: output error", path);
77 /** @brief Write a 24-bit word in bigendian format */
78 static inline void output_24(uint32_t n) {
79 if(putc(n >> 16, outputfp) < 0
80 || putc(n >> 8, outputfp) < 0
81 || putc(n, outputfp) < 0)
82 fatal(errno, "decoding %s: output error", path);
85 /** @brief Write a 32-bit word in bigendian format */
86 static inline void output_32(uint32_t n) {
87 if(putc(n >> 24, outputfp) < 0
88 || putc(n >> 16, outputfp) < 0
89 || putc(n >> 8, outputfp) < 0
90 || putc(n, outputfp) < 0)
91 fatal(errno, "decoding %s: output error", path);
94 /** @brief Write a block header
95 * @param rate Sample rate in Hz
96 * @param channels Channel count (currently only 1 or 2 supported)
97 * @param bits Bits per sample (must be a multiple of 8, no more than 64)
98 * @param nbytes Total number of data bytes
99 * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE
101 * Checks that the sample format is a supported one (so other calls do not have
102 * to) and calls fatal() on error.
104 static void output_header(int rate,
109 struct stream_header header;
111 if(bits <= 0 || bits % 8 || bits > 64)
112 fatal(0, "decoding %s: unsupported sample size %d bits", path, bits);
113 if(channels <= 0 || channels > 2)
114 fatal(0, "decoding %s: unsupported channel count %d", path, channels);
116 fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate);
119 header.channels = channels;
120 header.endian = endian;
121 header.nbytes = nbytes;
122 if(fwrite(&header, sizeof header, 1, outputfp) < 1)
123 fatal(errno, "decoding %s: writing format header", path);
126 /** @brief Dithering state
127 * Filched from mpg321, which credits it to Robert Leslie */
128 struct audio_dither {
129 mad_fixed_t error[3];
133 /** @brief 32-bit PRNG
134 * Filched from mpg321, which credits it to Robert Leslie */
135 static inline unsigned long prng(unsigned long state)
137 return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
140 /** @brief Generic linear sample quantize and dither routine
141 * Filched from mpg321, which credits it to Robert Leslie */
142 static long audio_linear_dither(mad_fixed_t sample,
143 struct audio_dither *dither) {
144 unsigned int scalebits;
145 mad_fixed_t output, mask, rnd;
154 sample += dither->error[0] - dither->error[1] + dither->error[2];
156 dither->error[2] = dither->error[1];
157 dither->error[1] = dither->error[0] / 2;
160 output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1));
162 scalebits = MAD_F_FRACBITS + 1 - bits;
163 mask = (1L << scalebits) - 1;
166 rnd = prng(dither->random);
167 output += (rnd & mask) - (dither->random & mask);
169 dither->random = rnd;
178 else if (output < MIN) {
189 dither->error[0] = sample - output;
192 return output >> scalebits;
195 /** @brief MP3 output callback */
196 static enum mad_flow mp3_output(void attribute((unused)) *data,
197 struct mad_header const *header,
198 struct mad_pcm *pcm) {
199 size_t n = pcm->length;
200 const mad_fixed_t *l = pcm->samples[0], *r = pcm->samples[1];
201 static struct audio_dither ld[1], rd[1];
203 output_header(header->samplerate,
206 2 * pcm->channels * pcm->length,
208 switch(pcm->channels) {
211 output_16(audio_linear_dither(*l++, ld));
215 output_16(audio_linear_dither(*l++, ld));
216 output_16(audio_linear_dither(*r++, rd));
220 return MAD_FLOW_CONTINUE;
223 /** @brief MP3 input callback */
224 static enum mad_flow mp3_input(void attribute((unused)) *data,
225 struct mad_stream *stream) {
228 /* libmad requires its caller to do ALL the buffering work, including coping
229 * with partial frames. Given that it appears to be completely undocumented
230 * you could perhaps be forgiven for not discovering this... */
232 /* Compute total number of bytes consumed */
233 used = (char *)stream->next_frame - input_buffer;
234 /* Compute number of bytes left to consume */
235 remain = input_count - used;
236 memmove(input_buffer, input_buffer + used, remain);
241 n = read(inputfd, input_buffer + remain, (sizeof input_buffer) - remain);
243 fatal(errno, "reading from %s", path);
244 /* Compute total number of bytes available */
245 input_count = remain + n;
247 mad_stream_buffer(stream, (unsigned char *)input_buffer, input_count);
249 return MAD_FLOW_CONTINUE;
251 return MAD_FLOW_STOP;
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) {
259 /* Just generates pointless verbosity l-( */
260 error(0, "decoding %s: %s (%#04x)",
261 path, mad_stream_errorstr(stream), stream->error);
262 return MAD_FLOW_CONTINUE;
265 /** @brief MP3 decoder */
266 static void decode_mp3(void) {
267 struct mad_decoder mad[1];
269 if((inputfd = open(path, O_RDONLY)) < 0)
270 fatal(errno, "opening %s", path);
271 mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/,
272 mp3_output, mp3_error, 0/*message*/);
273 if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC))
275 mad_decoder_finish(mad);
278 /** @brief OGG decoder */
279 static void decode_ogg(void) {
281 OggVorbis_File vf[1];
287 if(!(fp = fopen(path, "rb")))
288 fatal(errno, "cannot open %s", path);
289 /* There doesn't seem to be any standard function for mapping the error codes
291 if((err = ov_open(fp, vf, 0/*initial*/, 0/*ibytes*/)))
292 fatal(0, "ov_fopen %s: %d", path, err);
293 if(!(vi = ov_info(vf, 0/*link*/)))
294 fatal(0, "ov_info %s: failed", path);
295 while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/,
296 2/*bytes/word*/, 1/*signed*/, &bitstream))) {
298 fatal(0, "ov_read %s: %ld", path, n);
300 fatal(0, "only single-bitstream ogg files are supported");
301 output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG);
302 if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n)
303 fatal(errno, "decoding %s: writing sample data", path);
307 /** @brief Sample data callback used by decode_wav() */
308 static int wav_write(struct wavfile attribute((unused)) *f,
311 void attribute((unused)) *u) {
312 if(fwrite(data, 1, nbytes, outputfp) < nbytes)
313 fatal(errno, "decoding %s: writing sample data", path);
317 /** @brief WAV file decoder */
318 static void decode_wav(void) {
322 if((err = wav_init(f, path)))
323 fatal(err, "opening %s", path);
324 output_header(f->rate, f->channels, f->bits, f->datasize, ENDIAN_LITTLE);
325 if((err = wav_data(f, wav_write, 0)))
326 fatal(err, "error decoding %s", path);
329 /** @brief Metadata callback for FLAC decoder
331 * This is a no-op here.
333 static void flac_metadata(const FLAC__FileDecoder attribute((unused)) *decoder,
334 const FLAC__StreamMetadata attribute((unused)) *metadata,
335 void attribute((unused)) *client_data) {
338 /** @brief Error callback for FLAC decoder */
339 static void flac_error(const FLAC__FileDecoder attribute((unused)) *decoder,
340 FLAC__StreamDecoderErrorStatus status,
341 void attribute((unused)) *client_data) {
342 fatal(0, "error decoding %s: %s", path,
343 FLAC__StreamDecoderErrorStatusString[status]);
346 /** @brief Write callback for FLAC decoder */
347 static FLAC__StreamDecoderWriteStatus flac_write
348 (const FLAC__FileDecoder attribute((unused)) *decoder,
349 const FLAC__Frame *frame,
350 const FLAC__int32 *const buffer[],
351 void attribute((unused)) *client_data) {
354 output_header(frame->header.sample_rate,
355 frame->header.channels,
356 frame->header.bits_per_sample,
357 (frame->header.channels * frame->header.blocksize
358 * frame->header.bits_per_sample) / 8,
360 for(n = 0; n < frame->header.blocksize; ++n) {
361 for(c = 0; c < frame->header.channels; ++c) {
362 switch(frame->header.bits_per_sample) {
363 case 8: output_8(buffer[c][n]); break;
364 case 16: output_16(buffer[c][n]); break;
365 case 24: output_24(buffer[c][n]); break;
366 case 32: output_32(buffer[c][n]); break;
370 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
374 /** @brief FLAC file decoder */
375 static void decode_flac(void) {
376 #if HAVE_FLAC_FILE_DECODER_H
377 FLAC__FileDecoder *fd = 0;
378 FLAC__FileDecoderState fs;
380 if(!(fd = FLAC__file_decoder_new()))
381 fatal(0, "FLAC__file_decoder_new failed");
382 if(!(FLAC__file_decoder_set_filename(fd, path)))
383 fatal(0, "FLAC__file_set_filename failed");
384 FLAC__file_decoder_set_metadata_callback(fd, flac_metadata);
385 FLAC__file_decoder_set_error_callback(fd, flac_error);
386 FLAC__file_decoder_set_write_callback(fd, flac_write);
387 if((fs = FLAC__file_decoder_init(fd)))
388 fatal(0, "FLAC__file_decoder_init: %s", FLAC__FileDecoderStateString[fs]);
389 FLAC__file_decoder_process_until_end_of_file(fd);
391 FLAC__StreamDecoder *sd = 0;
392 FLAC__StreamDecoderInitStatus is;
394 if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata,
396 fatal(0, "FLAC__stream_decoder_init_file %s: %s",
397 path, FLAC__StreamDecoderInitStatusString[is]);
401 /** @brief Lookup table of decoders */
402 static const struct decoder decoders[] = {
403 { "*.mp3", decode_mp3 },
404 { "*.MP3", decode_mp3 },
405 { "*.ogg", decode_ogg },
406 { "*.OGG", decode_ogg },
407 { "*.flac", decode_flac },
408 { "*.FLAC", decode_flac },
409 { "*.wav", decode_wav },
410 { "*.WAV", decode_wav },
414 static const struct option options[] = {
415 { "help", no_argument, 0, 'h' },
416 { "version", no_argument, 0, 'V' },
420 /* Display usage message and terminate. */
421 static void help(void) {
423 " disorder-decode [OPTIONS] PATH\n"
425 " --help, -h Display usage message\n"
426 " --version, -V Display version number\n"
428 "Audio decoder for DisOrder. Only intended to be used by speaker\n"
429 "process, not for normal users.\n");
434 int main(int argc, char **argv) {
439 if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale");
440 while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) {
443 case 'V': version("disorder-decode");
444 default: fatal(0, "invalid option");
448 fatal(0, "missing filename");
449 if(optind + 1 < argc)
450 fatal(0, "excess arguments");
451 if((e = getenv("DISORDER_RAW_FD"))) {
452 if(!(outputfp = fdopen(atoi(e), "wb")))
453 fatal(errno, "fdopen");
459 && fnmatch(decoders[n].pattern, path, 0) != 0;
462 if(!decoders[n].pattern)
463 fatal(0, "cannot determine file type for %s", path);
464 decoders[n].decode();