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