130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "FlacPcm.hxx"
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#include "CheckAudioFormat.hxx"
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#include "util/RuntimeError.hxx"
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#include "util/ConstBuffer.hxx"
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#include <assert.h>
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static SampleFormat
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flac_sample_format(unsigned bits_per_sample)
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{
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switch (bits_per_sample) {
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case 8:
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return SampleFormat::S8;
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case 16:
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return SampleFormat::S16;
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case 24:
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return SampleFormat::S24_P32;
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case 32:
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return SampleFormat::S32;
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default:
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return SampleFormat::UNDEFINED;
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}
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}
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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 = flac_sample_format(bits_per_sample);
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if (sample_format == SampleFormat::UNDEFINED)
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throw FormatRuntimeError("Unsupported FLAC bit depth: %u",
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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[], size_t n_frames)
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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)
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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)
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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 ConstBuffer<void>
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FlacImport(PcmBuffer &buffer, const FLAC__int32 *const src[], size_t n_frames,
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unsigned n_channels)
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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 {dest, dest_size};
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}
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ConstBuffer<void>
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FlacPcmImport::Import(const FLAC__int32 *const src[], size_t n_frames)
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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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assert(false);
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gcc_unreachable();
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}
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