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decoder/dsdiff: reverse bits to most significant bit first

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Allow to remove this complexity from the MPD core.
This commit is contained in:
Max Kellermann
2012-03-21 09:01:56 +01:00
parent c1d0a8b5ce
commit 238c3adad1
2 changed files with 18 additions and 6 deletions
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21
src/decoder/dsdiff_decoder_plugin.c
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@@ -28,6 +28,7 @@
#include "dsdiff_decoder_plugin.h"
#include "decoder_api.h"
#include "audio_check.h"
#include "util/bit_reverse.h"
#include <unistd.h>
#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
@@ -54,14 +55,12 @@ struct dsdiff_metadata {
unsigned sample_rate, channels;
};
static enum sample_format dsd_sample_format;
static bool lsbitfirst;
static bool
dsdiff_init(const struct config_param *param)
{
dsd_sample_format = config_get_block_bool(param, "lsbitfirst", false)
? SAMPLE_FORMAT_DSD_LSBFIRST
: SAMPLE_FORMAT_DSD;
lsbitfirst = config_get_block_bool(param, "lsbitfirst", false);
return true;
}
@@ -301,6 +300,13 @@ dsdiff_read_metadata(struct decoder *decoder, struct input_stream *is,
}
}
static void
bit_reverse_buffer(uint8_t *p, uint8_t *end)
{
for (; p < end; ++p)
*p = bit_reverse(*p);
}
/**
* Decode one "DSD" chunk.
*/
@@ -332,6 +338,9 @@ dsdiff_decode_chunk(struct decoder *decoder, struct input_stream *is,
chunk_size -= nbytes;
if (lsbitfirst)
bit_reverse_buffer(buffer, buffer + nbytes);
enum decoder_command cmd =
decoder_data(decoder, is, buffer, nbytes, 0);
switch (cmd) {
@@ -367,7 +376,7 @@ dsdiff_stream_decode(struct decoder *decoder, struct input_stream *is)
GError *error = NULL;
struct audio_format audio_format;
if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
dsd_sample_format,
SAMPLE_FORMAT_DSD,
metadata.channels, &error)) {
g_warning("%s", error->message);
g_error_free(error);
@@ -420,7 +429,7 @@ dsdiff_scan_stream(struct input_stream *is,
struct audio_format audio_format;
if (!audio_format_init_checked(&audio_format, metadata.sample_rate / 8,
dsd_sample_format,
SAMPLE_FORMAT_DSD,
metadata.channels, NULL))
/* refuse to parse files which we cannot play anyway */
return false;