+/** @brief OGG decoder */
+static void decode_ogg(void) {
+ FILE *fp;
+ OggVorbis_File vf[1];
+ int err;
+ long n;
+ int bitstream;
+ vorbis_info *vi;
+
+ if(!(fp = fopen(path, "rb")))
+ fatal(errno, "cannot open %s", path);
+ /* There doesn't seem to be any standard function for mapping the error codes
+ * to strings l-( */
+ if((err = ov_open(fp, vf, 0/*initial*/, 0/*ibytes*/)))
+ fatal(0, "ov_fopen %s: %d", path, err);
+ if(!(vi = ov_info(vf, 0/*link*/)))
+ fatal(0, "ov_info %s: failed", path);
+ while((n = ov_read(vf, input_buffer, sizeof input_buffer, 1/*bigendianp*/,
+ 2/*bytes/word*/, 1/*signed*/, &bitstream))) {
+ if(n < 0)
+ fatal(0, "ov_read %s: %ld", path, n);
+ if(bitstream > 0)
+ fatal(0, "only single-bitstream ogg files are supported");
+ output_header(vi->rate, vi->channels, 16/*bits*/, n, ENDIAN_BIG);
+ if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n)
+ fatal(errno, "decoding %s: writing sample data", path);
+ }
+}
+
+/** @brief Sample data callback used by decode_wav() */
+static int wav_write(struct wavfile attribute((unused)) *f,
+ const char *data,
+ size_t nbytes,
+ void attribute((unused)) *u) {
+ if(fwrite(data, 1, nbytes, outputfp) < nbytes)
+ fatal(errno, "decoding %s: writing sample data", path);
+ return 0;
+}
+
+/** @brief WAV file decoder */
+static void decode_wav(void) {
+ struct wavfile f[1];
+ int err;
+
+ if((err = wav_init(f, path)))
+ fatal(err, "opening %s", path);
+ output_header(f->rate, f->channels, f->bits, f->datasize, ENDIAN_LITTLE);
+ if((err = wav_data(f, wav_write, 0)))
+ fatal(err, "error decoding %s", path);
+}
+
+/** @brief Metadata callback for FLAC decoder
+ *
+ * This is a no-op here.
+ */
+static void flac_metadata(const FLAC__FileDecoder attribute((unused)) *decoder,
+ const FLAC__StreamMetadata attribute((unused)) *metadata,
+ void attribute((unused)) *client_data) {
+}
+
+/** @brief Error callback for FLAC decoder */
+static void flac_error(const FLAC__FileDecoder attribute((unused)) *decoder,
+ FLAC__StreamDecoderErrorStatus status,
+ void attribute((unused)) *client_data) {
+ fatal(0, "error decoding %s: %s", path,
+ FLAC__StreamDecoderErrorStatusString[status]);
+}
+
+/** @brief Write callback for FLAC decoder */
+static FLAC__StreamDecoderWriteStatus flac_write
+ (const FLAC__FileDecoder attribute((unused)) *decoder,
+ const FLAC__Frame *frame,
+ const FLAC__int32 *const buffer[],
+ void attribute((unused)) *client_data) {
+ size_t n, c;
+
+ output_header(frame->header.sample_rate,
+ frame->header.channels,
+ frame->header.bits_per_sample,
+ (frame->header.channels * frame->header.blocksize
+ * frame->header.bits_per_sample) / 8,
+ ENDIAN_BIG);
+ for(n = 0; n < frame->header.blocksize; ++n) {
+ for(c = 0; c < frame->header.channels; ++c) {
+ switch(frame->header.bits_per_sample) {
+ case 8: output_8(buffer[c][n]); break;
+ case 16: output_16(buffer[c][n]); break;
+ case 24: output_24(buffer[c][n]); break;
+ case 32: output_32(buffer[c][n]); break;
+ }
+ }
+ }
+ return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
+}
+
+
+/** @brief FLAC file decoder */
+static void decode_flac(void) {
+#if HAVE_FLAC_FILE_DECODER_H
+ FLAC__FileDecoder *fd = 0;
+ FLAC__FileDecoderState fs;
+
+ if(!(fd = FLAC__file_decoder_new()))
+ fatal(0, "FLAC__file_decoder_new failed");
+ if(!(FLAC__file_decoder_set_filename(fd, path)))
+ fatal(0, "FLAC__file_set_filename failed");
+ FLAC__file_decoder_set_metadata_callback(fd, flac_metadata);
+ FLAC__file_decoder_set_error_callback(fd, flac_error);
+ FLAC__file_decoder_set_write_callback(fd, flac_write);
+ if((fs = FLAC__file_decoder_init(fd)))
+ fatal(0, "FLAC__file_decoder_init: %s", FLAC__FileDecoderStateString[fs]);
+ FLAC__file_decoder_process_until_end_of_file(fd);
+#else
+ FLAC__StreamDecoder *sd = 0;
+ FLAC__StreamDecoderInitStatus is;
+
+ if((is = FLAC__stream_decoder_init_file(sd, path, flac_write, flac_metadata,
+ flac_error, 0)))
+ fatal(0, "FLAC__stream_decoder_init_file %s: %s",
+ path, FLAC__StreamDecoderInitStatusString[is]);
+#endif
+}
+