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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "FlacPcm.hxx"
#include "CheckAudioFormat.hxx"
#include "util/RuntimeError.hxx"
#include "util/ConstBuffer.hxx"
#include <assert.h>
static SampleFormat
flac_sample_format(unsigned bits_per_sample)
{
switch (bits_per_sample) {
case 8:
return SampleFormat::S8;
case 16:
return SampleFormat::S16;
case 24:
return SampleFormat::S24_P32;
case 32:
return SampleFormat::S32;
default:
return SampleFormat::UNDEFINED;
}
}
void
FlacPcmImport::Open(unsigned sample_rate, unsigned bits_per_sample,
unsigned channels)
{
auto sample_format = flac_sample_format(bits_per_sample);
if (sample_format == SampleFormat::UNDEFINED)
throw FormatRuntimeError("Unsupported FLAC bit depth: %u",
bits_per_sample);
audio_format = CheckAudioFormat(sample_rate, sample_format, channels);
}
template<typename T>
static void
FlacImportStereo(T *dest, const FLAC__int32 *const src[], size_t n_frames)
{
for (size_t i = 0; i != n_frames; ++i) {
*dest++ = (T)src[0][i];
*dest++ = (T)src[1][i];
}
}
template<typename T>
static void
FlacImportAny(T *dest, const FLAC__int32 *const src[], size_t n_frames,
unsigned n_channels)
{
for (size_t i = 0; i != n_frames; ++i)
for (unsigned c = 0; c != n_channels; ++c)
*dest++ = src[c][i];
}
template<typename T>
static void
FlacImport(T *dest, const FLAC__int32 *const src[], size_t n_frames,
unsigned n_channels)
{
if (n_channels == 2)
FlacImportStereo(dest, src, n_frames);
else
FlacImportAny(dest, src, n_frames, n_channels);
}
template<typename T>
static ConstBuffer<void>
FlacImport(PcmBuffer &buffer, const FLAC__int32 *const src[], size_t n_frames,
unsigned n_channels)
{
size_t n_samples = n_frames * n_channels;
size_t dest_size = n_samples * sizeof(T);
T *dest = (T *)buffer.Get(dest_size);
FlacImport(dest, src, n_frames, n_channels);
return {dest, dest_size};
}
ConstBuffer<void>
FlacPcmImport::Import(const FLAC__int32 *const src[], size_t n_frames)
{
switch (audio_format.format) {
case SampleFormat::S16:
return FlacImport<int16_t>(buffer, src, n_frames,
audio_format.channels);
case SampleFormat::S24_P32:
case SampleFormat::S32:
return FlacImport<int32_t>(buffer, src, n_frames,
audio_format.channels);
case SampleFormat::S8:
return FlacImport<int8_t>(buffer, src, n_frames,
audio_format.channels);
case SampleFormat::FLOAT:
case SampleFormat::DSD:
case SampleFormat::UNDEFINED:
break;
}
assert(false);
gcc_unreachable();
}
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