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/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "audio_format.h"
#include <assert.h>
#include <stdio.h>
#if G_BYTE_ORDER == G_BIG_ENDIAN
#define REVERSE_ENDIAN_SUFFIX "_le"
#else
#define REVERSE_ENDIAN_SUFFIX "_be"
#endif
void
audio_format_mask_apply(struct audio_format *af,
const struct audio_format *mask)
{
assert(audio_format_valid(af));
assert(audio_format_mask_valid(mask));
if (af->format == SAMPLE_FORMAT_DSD &&
mask->format == SAMPLE_FORMAT_DSD_OVER_USB &&
mask->sample_rate == 0)
/* each DSD-over-USB sample contains 2 DSD bytes (16
DSD bits), which means the sample rate must be
halved; this is not the real 1 bit sample rate, but
MPD's point of view */
af->sample_rate /= 2;
if (mask->sample_rate != 0)
af->sample_rate = mask->sample_rate;
if (mask->format != SAMPLE_FORMAT_UNDEFINED)
af->format = mask->format;
if (mask->channels != 0)
af->channels = mask->channels;
assert(audio_format_valid(af));
}
const char *
sample_format_to_string(enum sample_format format)
{
switch (format) {
case SAMPLE_FORMAT_UNDEFINED:
return "?";
case SAMPLE_FORMAT_S8:
return "8";
case SAMPLE_FORMAT_S16:
return "16";
case SAMPLE_FORMAT_S24:
return "24_3";
case SAMPLE_FORMAT_S24_P32:
return "24";
case SAMPLE_FORMAT_S32:
return "32";
case SAMPLE_FORMAT_FLOAT:
return "f";
case SAMPLE_FORMAT_DSD:
return "dsd";
case SAMPLE_FORMAT_DSD_OVER_USB:
return "dsdusb";
}
/* unreachable */
assert(false);
return "?";
}
const char *
audio_format_to_string(const struct audio_format *af,
struct audio_format_string *s)
{
assert(af != NULL);
assert(s != NULL);
snprintf(s->buffer, sizeof(s->buffer), "%u:%s%s:%u",
af->sample_rate, sample_format_to_string(af->format),
af->reverse_endian ? REVERSE_ENDIAN_SUFFIX : "",
af->channels);
return s->buffer;
}
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