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LibsamplerateResampler.hxx
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1 /*
2 * Copyright 2003-2017 The Music Player Daemon Project
3 * http://www.musicpd.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #ifndef MPD_PCM_LIBSAMPLERATE_RESAMPLER_HXX
21 #define MPD_PCM_LIBSAMPLERATE_RESAMPLER_HXX
22
23 #include "Resampler.hxx"
24 #include "PcmBuffer.hxx"
25 #include "AudioFormat.hxx"
26 #include "Compiler.h"
27
28 #include <samplerate.h>
29
30 struct ConfigBlock;
31
35 class LibsampleratePcmResampler final : public PcmResampler {
36 unsigned src_rate, dest_rate;
37 unsigned channels;
38
39 SRC_STATE *state;
40 SRC_DATA data;
41
42 PcmBuffer buffer;
43
44 public:
45 AudioFormat Open(AudioFormat &af, unsigned new_sample_rate) override;
46 void Close() override;
47 void Reset() override;
48 ConstBuffer<void> Resample(ConstBuffer<void> src) override;
49
50 private:
51 ConstBuffer<float> Resample2(ConstBuffer<float> src);
52 };
53
54 void
55 pcm_resample_lsr_global_init(const ConfigBlock &block);
56
57 #endif
AudioFormat
This structure describes the format of a raw PCM stream.
Definition: AudioFormat.hxx:37
LibsampleratePcmResampler::Reset
void Reset() override
Reset the filter's state, e.g.
ConstBuffer< void >
Definition: ConstBuffer.hxx:45
AudioFormat.hxx
pcm_resample_lsr_global_init
void pcm_resample_lsr_global_init(const ConfigBlock &block)
Resampler.hxx
PcmBuffer.hxx
ConfigBlock
Definition: Block.hxx:57
LibsampleratePcmResampler::Close
void Close() override
Closes the resampler.
LibsampleratePcmResampler
A resampler using libsamplerate.
Definition: LibsamplerateResampler.hxx:35
Compiler.h
PcmResampler
This is an interface for plugins that convert PCM data to a specific sample rate. ...
Definition: Resampler.hxx:32
PcmBuffer
Manager for a temporary buffer which grows as needed.
Definition: PcmBuffer.hxx:33
ConstBuffer
A reference to a memory area that is read-only.
Definition: FlacPcm.hxx:29
LibsampleratePcmResampler::Resample
ConstBuffer< void > Resample(ConstBuffer< void > src) override
Resamples a block of PCM data.
LibsampleratePcmResampler::Open
AudioFormat Open(AudioFormat &af, unsigned new_sample_rate) override
Opens the resampler, preparing it for Resample().