#include <fnmatch.h>
#include <mad.h>
#include <vorbis/vorbisfile.h>
+#include <FLAC/file_decoder.h>
#include "log.h"
#include "syscalls.h"
static const char *path;
/** @brief Input buffer */
-static char buffer[1048576];
+static char input_buffer[1048576];
/** @brief Open the input file */
static void open_input(void) {
* @return Number of bytes read
*/
static size_t fill(void) {
- int n = read(inputfd, buffer, sizeof buffer);
+ int n = read(inputfd, input_buffer, sizeof input_buffer);
if(n < 0)
fatal(errno, "reading from %s", path);
return n;
}
+/** @brief Write an 8-bit word */
+static inline void output_8(int n) {
+ if(putc(n, outputfp) < 0)
+ fatal(errno, "decoding %s: output error", path);
+}
+
/** @brief Write a 16-bit word in bigendian format */
static inline void output_16(uint16_t n) {
if(putc(n >> 8, outputfp) < 0
- || putc(n & 0xFF, outputfp) < 0)
+ || putc(n, outputfp) < 0)
+ fatal(errno, "decoding %s: output error", path);
+}
+
+/** @brief Write a 24-bit word in bigendian format */
+static inline void output_24(uint32_t n) {
+ if(putc(n >> 16, outputfp) < 0
+ || putc(n >> 8, outputfp) < 0
+ || putc(n, outputfp) < 0)
fatal(errno, "decoding %s: output error", path);
}
-/** @brief Write the header
- * If called more than once, either does nothing (if you kept the same
- * output encoding) or fails (if you changed it).
+/** @brief Write a 32-bit word in bigendian format */
+static inline void output_32(uint32_t n) {
+ if(putc(n >> 24, outputfp) < 0
+ || putc(n >> 16, outputfp) < 0
+ || putc(n >> 8, outputfp) < 0
+ || putc(n, outputfp) < 0)
+ fatal(errno, "decoding %s: output error", path);
+}
+
+/** @brief Write a block header
+ * @param rate Sample rate in Hz
+ * @param channels Channel count (currently only 1 or 2 supported)
+ * @param bits Bits per sample (must be a multiple of 8, no more than 64)
+ * @param nbytes Total number of data bytes
+ * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE
+ *
+ * Checks that the sample format is a supported one (so other calls do not have
+ * to) and calls fatal() on error.
*/
static void output_header(int rate,
int channels,
int endian) {
struct stream_header header;
+ if(bits <= 0 || bits % 8 || bits > 64)
+ fatal(0, "decoding %s: unsupported sample size %d bits", path, bits);
+ if(channels <= 0 || channels > 2)
+ fatal(0, "decoding %s: unsupported channel count %d", path, channels);
+ if(rate <= 0)
+ fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate);
header.rate = rate;
header.bits = bits;
header.channels = channels;
output_16(audio_linear_dither(*r++, rd));
}
break;
- default:
- fatal(0, "decoding %s: unsupported channel count %d", path, pcm->channels);
}
return MAD_FLOW_CONTINUE;
}
if(!n)
return MAD_FLOW_STOP;
- mad_stream_buffer(stream, (unsigned char *)buffer, n);
+ mad_stream_buffer(stream, (unsigned char *)input_buffer, n);
return MAD_FLOW_CONTINUE;
}
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, buffer, sizeof buffer, 1/*bigendianp*/,
+ 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(buffer, 1, n, outputfp) < (size_t)n)
+ if(fwrite(input_buffer, 1, n, outputfp) < (size_t)n)
fatal(errno, "decoding %s: writing sample data", path);
}
}
if((err = wav_init(f, path)))
fatal(err, "opening %s", path);
- if(f->bits % 8)
- fatal(err, "%s: unsupported byte size %d", path, f->bits);
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) {
+ 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);
+}
+
/** @brief Lookup table of decoders */
static const struct decoder decoders[] = {
{ "*.mp3", decode_mp3 },
{ "*.MP3", decode_mp3 },
{ "*.ogg", decode_ogg },
{ "*.OGG", decode_ogg },
+ { "*.flac", decode_flac },
+ { "*.FLAC", decode_flac },
{ "*.wav", decode_wav },
{ "*.WAV", decode_wav },
{ 0, 0 }
~mdw / disorder / commitdiff