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/*
* Copyright 2003-2017 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.
*/
#ifndef MPD_PCM_SAMPLE_FORMAT_HXX
#define MPD_PCM_SAMPLE_FORMAT_HXX
#include "util/Compiler.h"
#include <stdint.h>
#if defined(_WIN32)
/* on WIN32, "FLOAT" is already defined, and this triggers -Wshadow */
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wshadow"
#endif
enum class SampleFormat : uint8_t {
UNDEFINED = 0,
S8,
S16,
/**
* Signed 24 bit integer samples, packed in 32 bit integers
* (the most significant byte is filled with the sign bit).
*/
S24_P32,
S32,
/**
* 32 bit floating point samples in the host's format. The
* range is -1.0f to +1.0f.
*/
FLOAT,
/**
* Direct Stream Digital. 1-bit samples; each frame has one
* byte (8 samples) per channel.
*/
DSD,
};
#if defined(_WIN32)
#pragma GCC diagnostic pop
#endif
/**
* Checks whether the sample format is valid.
*/
constexpr bool
audio_valid_sample_format(SampleFormat format) noexcept
{
switch (format) {
case SampleFormat::S8:
case SampleFormat::S16:
case SampleFormat::S24_P32:
case SampleFormat::S32:
case SampleFormat::FLOAT:
case SampleFormat::DSD:
return true;
case SampleFormat::UNDEFINED:
break;
}
return false;
}
constexpr unsigned
sample_format_size(SampleFormat format) noexcept
{
switch (format) {
case SampleFormat::S8:
return 1;
case SampleFormat::S16:
return 2;
case SampleFormat::S24_P32:
case SampleFormat::S32:
case SampleFormat::FLOAT:
return 4;
case SampleFormat::DSD:
/* each frame has 8 samples per channel */
return 1;
case SampleFormat::UNDEFINED:
return 0;
}
gcc_unreachable();
}
/**
* Renders a #SampleFormat enum into a string, e.g. for printing it
* in a log file.
*
* @param format a #SampleFormat enum value
* @return the string
*/
gcc_pure gcc_returns_nonnull
const char *
sample_format_to_string(SampleFormat format) noexcept;
#endif
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