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92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "FlacPcm.hxx"
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#include "pcm/CheckAudioFormat.hxx"
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#include "lib/xiph/FlacAudioFormat.hxx"
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#include "lib/fmt/RuntimeError.hxx"
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#include <utility> // for std::unreachable()
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void
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FlacPcmImport::Open(unsigned sample_rate, unsigned bits_per_sample,
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unsigned channels)
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{
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auto sample_format = FlacSampleFormat(bits_per_sample);
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if (sample_format == SampleFormat::UNDEFINED)
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throw FmtRuntimeError("Unsupported FLAC bit depth: {}",
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bits_per_sample);
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audio_format = CheckAudioFormat(sample_rate, sample_format, channels);
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}
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template<typename T>
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static void
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FlacImportStereo(T *dest, const FLAC__int32 *const src[],
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size_t n_frames) noexcept
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{
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for (size_t i = 0; i != n_frames; ++i) {
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*dest++ = (T)src[0][i];
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*dest++ = (T)src[1][i];
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}
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}
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template<typename T>
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static void
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FlacImportAny(T *dest, const FLAC__int32 *const src[], size_t n_frames,
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unsigned n_channels) noexcept
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{
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for (size_t i = 0; i != n_frames; ++i)
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for (unsigned c = 0; c != n_channels; ++c)
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*dest++ = src[c][i];
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}
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template<typename T>
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static void
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FlacImport(T *dest, const FLAC__int32 *const src[], size_t n_frames,
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unsigned n_channels) noexcept
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{
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if (n_channels == 2)
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FlacImportStereo(dest, src, n_frames);
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else
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FlacImportAny(dest, src, n_frames, n_channels);
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}
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template<typename T>
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static std::span<const std::byte>
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FlacImport(PcmBuffer &buffer, const FLAC__int32 *const src[], size_t n_frames,
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unsigned n_channels) noexcept
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{
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size_t n_samples = n_frames * n_channels;
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size_t dest_size = n_samples * sizeof(T);
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T *dest = (T *)buffer.Get(dest_size);
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FlacImport(dest, src, n_frames, n_channels);
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return std::as_bytes(std::span{dest, n_samples});
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}
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std::span<const std::byte>
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FlacPcmImport::Import(const FLAC__int32 *const src[], size_t n_frames) noexcept
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{
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switch (audio_format.format) {
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case SampleFormat::S16:
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return FlacImport<int16_t>(buffer, src, n_frames,
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audio_format.channels);
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case SampleFormat::S24_P32:
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case SampleFormat::S32:
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return FlacImport<int32_t>(buffer, src, n_frames,
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audio_format.channels);
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case SampleFormat::S8:
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return FlacImport<int8_t>(buffer, src, n_frames,
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audio_format.channels);
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case SampleFormat::FLOAT:
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case SampleFormat::DSD:
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case SampleFormat::UNDEFINED:
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break;
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}
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std::unreachable();
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}
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