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Diffstat (limited to 'src/filter/plugins/VolumeFilterPlugin.cxx')
-rw-r--r-- | src/filter/plugins/VolumeFilterPlugin.cxx | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/filter/plugins/VolumeFilterPlugin.cxx b/src/filter/plugins/VolumeFilterPlugin.cxx new file mode 100644 index 000000000..17e061476 --- /dev/null +++ b/src/filter/plugins/VolumeFilterPlugin.cxx @@ -0,0 +1,104 @@ +/* + * Copyright (C) 2003-2014 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 "VolumeFilterPlugin.hxx" +#include "filter/FilterPlugin.hxx" +#include "filter/FilterInternal.hxx" +#include "filter/FilterRegistry.hxx" +#include "pcm/Volume.hxx" +#include "AudioFormat.hxx" +#include "util/ConstBuffer.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" + +#include <assert.h> +#include <string.h> + +class VolumeFilter final : public Filter { + PcmVolume pv; + +public: + unsigned GetVolume() const { + return pv.GetVolume(); + } + + void SetVolume(unsigned _volume) { + pv.SetVolume(_volume); + } + + /* virtual methods from class Filter */ + AudioFormat Open(AudioFormat &af, Error &error) override; + void Close() override; + ConstBuffer<void> FilterPCM(ConstBuffer<void> src, + Error &error) override; +}; + +static constexpr Domain volume_domain("pcm_volume"); + +static Filter * +volume_filter_init(gcc_unused const config_param ¶m, + gcc_unused Error &error) +{ + return new VolumeFilter(); +} + +AudioFormat +VolumeFilter::Open(AudioFormat &audio_format, Error &error) +{ + if (!pv.Open(audio_format.format, error)) + return AudioFormat::Undefined(); + + return audio_format; +} + +void +VolumeFilter::Close() +{ + pv.Close(); +} + +ConstBuffer<void> +VolumeFilter::FilterPCM(ConstBuffer<void> src, gcc_unused Error &error) +{ + return pv.Apply(src); +} + +const struct filter_plugin volume_filter_plugin = { + "volume", + volume_filter_init, +}; + +unsigned +volume_filter_get(const Filter *_filter) +{ + const VolumeFilter *filter = + (const VolumeFilter *)_filter; + + return filter->GetVolume(); +} + +void +volume_filter_set(Filter *_filter, unsigned volume) +{ + VolumeFilter *filter = (VolumeFilter *)_filter; + + filter->SetVolume(volume); +} + |