64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright The Music Player Daemon Project
|
|
|
|
#ifndef MPD_PCM_FORMAT_CONVERTER_HXX
|
|
#define MPD_PCM_FORMAT_CONVERTER_HXX
|
|
|
|
#include "SampleFormat.hxx"
|
|
#include "Buffer.hxx"
|
|
#include "Dither.hxx"
|
|
|
|
#include <span>
|
|
|
|
#ifndef NDEBUG
|
|
#include <cassert>
|
|
#endif
|
|
|
|
/**
|
|
* A class that converts samples from one format to another.
|
|
*/
|
|
class PcmFormatConverter {
|
|
SampleFormat src_format, dest_format;
|
|
|
|
PcmBuffer buffer;
|
|
PcmDither dither;
|
|
|
|
public:
|
|
#ifndef NDEBUG
|
|
PcmFormatConverter() noexcept
|
|
:src_format(SampleFormat::UNDEFINED),
|
|
dest_format(SampleFormat::UNDEFINED) {}
|
|
|
|
~PcmFormatConverter() noexcept {
|
|
assert(src_format == SampleFormat::UNDEFINED);
|
|
assert(dest_format == SampleFormat::UNDEFINED);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Opens the object, prepare for Convert().
|
|
*
|
|
* Throws std::runtime_error on error.
|
|
*
|
|
* @param src_format the sample format of incoming data
|
|
* @param dest_format the sample format of outgoing data
|
|
*/
|
|
void Open(SampleFormat src_format, SampleFormat dest_format);
|
|
|
|
/**
|
|
* Closes the object. After that, you may call Open() again.
|
|
*/
|
|
void Close() noexcept;
|
|
|
|
/**
|
|
* Convert a block of PCM data.
|
|
*
|
|
* @param src the input buffer
|
|
* @return the destination buffer
|
|
*/
|
|
[[gnu::pure]]
|
|
std::span<const std::byte> Convert(std::span<const std::byte> src) noexcept;
|
|
};
|
|
|
|
#endif
|