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