144 lines
3.1 KiB
C++
144 lines
3.1 KiB
C++
/*
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* Copyright (C) 2003-2013 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 "VolumeFilterPlugin.hxx"
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#include "FilterPlugin.hxx"
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#include "FilterInternal.hxx"
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#include "FilterRegistry.hxx"
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#include "pcm/PcmVolume.hxx"
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#include "pcm/PcmBuffer.hxx"
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#include "AudioFormat.hxx"
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#include "util/Error.hxx"
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#include "util/Domain.hxx"
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#include <assert.h>
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#include <string.h>
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class VolumeFilter final : public Filter {
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/**
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* The current volume, from 0 to #PCM_VOLUME_1.
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*/
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unsigned volume;
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AudioFormat format;
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PcmBuffer buffer;
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public:
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VolumeFilter()
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:volume(PCM_VOLUME_1) {}
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unsigned GetVolume() const {
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assert(volume <= PCM_VOLUME_1);
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return volume;
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}
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void SetVolume(unsigned _volume) {
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assert(_volume <= PCM_VOLUME_1);
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volume = _volume;
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}
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virtual AudioFormat Open(AudioFormat &af, Error &error) override;
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virtual void Close();
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virtual const void *FilterPCM(const void *src, size_t src_size,
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size_t *dest_size_r, Error &error);
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};
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static constexpr Domain volume_domain("pcm_volume");
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static Filter *
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volume_filter_init(gcc_unused const config_param ¶m,
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gcc_unused Error &error)
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{
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return new VolumeFilter();
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}
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AudioFormat
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VolumeFilter::Open(AudioFormat &audio_format, gcc_unused Error &error)
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{
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format = audio_format;
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return format;
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}
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void
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VolumeFilter::Close()
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{
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buffer.Clear();
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}
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const void *
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VolumeFilter::FilterPCM(const void *src, size_t src_size,
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size_t *dest_size_r, Error &error)
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{
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*dest_size_r = src_size;
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if (volume >= PCM_VOLUME_1)
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/* optimized special case: 100% volume = no-op */
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return src;
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void *dest = buffer.Get(src_size);
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if (volume <= 0) {
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/* optimized special case: 0% volume = memset(0) */
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/* XXX is this valid for all sample formats? What
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about floating point? */
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memset(dest, 0, src_size);
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return dest;
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}
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memcpy(dest, src, src_size);
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bool success = pcm_volume(dest, src_size,
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format.format,
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volume);
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if (!success) {
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error.Set(volume_domain, "pcm_volume() has failed");
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return NULL;
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}
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return dest;
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}
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const struct filter_plugin volume_filter_plugin = {
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"volume",
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volume_filter_init,
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};
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unsigned
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volume_filter_get(const Filter *_filter)
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{
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const VolumeFilter *filter =
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(const VolumeFilter *)_filter;
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return filter->GetVolume();
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}
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void
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volume_filter_set(Filter *_filter, unsigned volume)
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{
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VolumeFilter *filter = (VolumeFilter *)_filter;
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filter->SetVolume(volume);
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}
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