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 3 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file server/decode.c
19 * @brief General-purpose decoder for use by speaker process
22 #include "disorder-server.h"
25 #include <vorbis/vorbisfile.h>
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>
31 # include <FLAC/stream_decoder.h>
32 #define FLAC__FileDecoder FLAC__StreamDecoder
33 #define FLAC__FileDecoderState FLAC__StreamDecoderState
37 #include "speaker-protocol.h"
40 /** @brief Encoding lookup table type */
42 /** @brief Glob pattern matching file */
44 /** @brief Decoder function */
48 /** @brief Input file */
51 /** @brief Output file */
52 static FILE *outputfp;
54 /** @brief Filename */
55 static const char *path;
57 /** @brief Input buffer */
58 static char input_buffer[1048576];
60 /** @brief Number of bytes read into buffer */
61 static int input_count;
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);
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
72 || putc(n, outputfp) < 0)
73 fatal(errno, "decoding %s: output error", path);
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)
81 fatal(errno, "decoding %s: output error", path);
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);
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
100 * Checks that the sample format is a supported one (so other calls do not have
101 * to) and calls fatal() on error.
103 static void output_header(int rate,
108 struct stream_header header;
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);
115 fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate);
118 header.channels = channels;
119 header.endian = endian;
120 header.nbytes = nbytes;
121 if(fwrite(&header, sizeof header, 1, outputfp) < 1)
122 fatal(errno, "decoding %s: writing format header", path);
125 /** @brief Dithering state
126 * Filched from mpg321, which credits it to Robert Leslie */
127 struct audio_dither {
128 mad_fixed_t error[3];
132 /** @brief 32-bit PRNG
133 * Filched from mpg321, which credits it to Robert Leslie */
134 static inline unsigned long prng(unsigned long state)
136 return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
139 /** @brief Generic linear sample quantize and dither routine
140 * Filched from mpg321, which credits it to Robert Leslie */
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;
153 sample += dither->error[0] - dither->error[1] + dither->error[2];
155 dither->error[2] = dither->error[1];
156 dither->error[1] = dither->error[0] / 2;
159 output = sample + (1L << (MAD_F_FRACBITS + 1 - bits - 1));
161 scalebits = MAD_F_FRACBITS + 1 - bits;
162 mask = (1L << scalebits) - 1;
165 rnd = prng(dither->random);
166 output += (rnd & mask) - (dither->random & mask);
168 dither->random = rnd;
177 else if (output < MIN) {
188 dither->error[0] = sample - output;
191 return output >> scalebits;
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];
202 output_header(header->samplerate,
205 2 * pcm->channels * pcm->length,
207 switch(pcm->channels) {
210 output_16(audio_linear_dither(*l++, ld));
214 output_16(audio_linear_dither(*l++, ld));
215 output_16(audio_linear_dither(*r++, rd));
219 return MAD_FLOW_CONTINUE;
222 /** @brief MP3 input callback */
223 static enum mad_flow mp3_input(void attribute((unused)) *data,
224 struct mad_stream *stream) {
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... */
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);
240 n = read(inputfd, input_buffer + remain, (sizeof input_buffer) - remain);
242 fatal(errno, "reading from %s", path);
243 /* Compute total number of bytes available */
244 input_count = remain + n;
246 mad_stream_buffer(stream, (unsigned char *)input_buffer, input_count);
248 return MAD_FLOW_CONTINUE;
250 return MAD_FLOW_STOP;
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) {
258 /* Just generates pointless verbosity l-( */
259 error(0, "decoding %s: %s (%#04x)",
260 path, mad_stream_errorstr(stream), stream->error);
261 return MAD_FLOW_CONTINUE;
264 /** @brief MP3 decoder */
265 static void decode_mp3(void) {
266 struct mad_decoder mad[1];
268 if((inputfd = open(path, O_RDONLY)) < 0)
269 fatal(errno, "opening %s", path);
270 mad_decoder_init(mad, 0/*data*/, mp3_input, 0/*header*/, 0/*filter*/,
271 mp3_output, mp3_error, 0/*message*/);
272 if(mad_decoder_run(mad, MAD_DECODER_MODE_SYNC))
274 mad_decoder_finish(mad);
277 /** @brief OGG decoder */
278 static void decode_ogg(void) {
280 OggVorbis_File vf[1];
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
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);
294 while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/,
295 2/*bytes/word*/, 1/*signed*/, &bitstream))) {
297 fatal(0, "ov_read %s: %ld", path, n);
299 fatal(0, "only single-bitstream ogg files are supported");
300 output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG);
301 if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n)
302 fatal(errno, "decoding %s: writing sample data", path);
306 /** @brief Sample data callback used by decode_wav() */
307 static int wav_write(struct wavfile attribute((unused)) *f,
310 void attribute((unused)) *u) {
311 if(fwrite(data, 1, nbytes, outputfp) < nbytes)
312 fatal(errno, "decoding %s: writing sample data", path);
316 /** @brief WAV file decoder */
317 static void decode_wav(void) {
321 if((err = wav_init(f, path)))
322 fatal(err, "opening %s", path);
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);
328 /** @brief Metadata callback for FLAC decoder
330 * This is a no-op here.
332 static void flac_metadata(const FLAC__FileDecoder attribute((unused)) *decoder,
333 const FLAC__StreamMetadata attribute((unused)) *metadata,
334 void attribute((unused)) *client_data) {
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]);
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) {
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,
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;
369 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
373 /** @brief FLAC file decoder */
374 static void decode_flac(void) {
375 #if HAVE_FLAC_FILE_DECODER_H
376 FLAC__FileDecoder *fd = 0;
377 FLAC__FileDecoderState fs;
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);
390 FLAC__StreamDecoder *sd = 0;
391 FLAC__StreamDecoderInitStatus is;
393 if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata,
395 fatal(0, "FLAC__stream_decoder_init_file %s: %s",
396 path, FLAC__StreamDecoderInitStatusString[is]);
400 /** @brief Lookup table of decoders */
401 static const struct decoder decoders[] = {
402 { "*.mp3", decode_mp3 },
403 { "*.MP3", decode_mp3 },
404 { "*.ogg", decode_ogg },
405 { "*.OGG", decode_ogg },
406 { "*.flac", decode_flac },
407 { "*.FLAC", decode_flac },
408 { "*.wav", decode_wav },
409 { "*.WAV", decode_wav },
413 static const struct option options[] = {
414 { "help", no_argument, 0, 'h' },
415 { "version", no_argument, 0, 'V' },
419 /* Display usage message and terminate. */
420 static void help(void) {
422 " disorder-decode [OPTIONS] PATH\n"
424 " --help, -h Display usage message\n"
425 " --version, -V Display version number\n"
427 "Audio decoder for DisOrder. Only intended to be used by speaker\n"
428 "process, not for normal users.\n");
433 int main(int argc, char **argv) {
438 if(!setlocale(LC_CTYPE, "")) fatal(errno, "calling setlocale");
439 while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) {
442 case 'V': version("disorder-decode");
443 default: fatal(0, "invalid option");
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");
458 && fnmatch(decoders[n].pattern, path, 0) != 0;
461 if(!decoders[n].pattern)
462 fatal(0, "cannot determine file type for %s", path);
463 decoders[n].decode();