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Diffstat (limited to 'src/filter/plugins/ConvertFilterPlugin.cxx')
-rw-r--r-- | src/filter/plugins/ConvertFilterPlugin.cxx | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/filter/plugins/ConvertFilterPlugin.cxx b/src/filter/plugins/ConvertFilterPlugin.cxx new file mode 100644 index 000000000..27e6774f8 --- /dev/null +++ b/src/filter/plugins/ConvertFilterPlugin.cxx @@ -0,0 +1,149 @@ +/* + * 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 "ConvertFilterPlugin.hxx" +#include "filter/FilterPlugin.hxx" +#include "filter/FilterInternal.hxx" +#include "filter/FilterRegistry.hxx" +#include "pcm/PcmConvert.hxx" +#include "util/Manual.hxx" +#include "AudioFormat.hxx" +#include "poison.h" + +#include <assert.h> + +class ConvertFilter final : public Filter { + /** + * The input audio format; PCM data is passed to the filter() + * method in this format. + */ + AudioFormat in_audio_format; + + /** + * The output audio format; the consumer of this plugin + * expects PCM data in this format. + * + * If this is AudioFormat::Undefined(), then the #PcmConvert + * attribute is not open. This can mean that Set() has failed + * or that no conversion is necessary. + */ + AudioFormat out_audio_format; + + Manual<PcmConvert> state; + +public: + bool Set(const AudioFormat &_out_audio_format, Error &error); + + virtual AudioFormat Open(AudioFormat &af, Error &error) override; + virtual void Close() override; + virtual const void *FilterPCM(const void *src, size_t src_size, + size_t *dest_size_r, + Error &error) override; +}; + +static Filter * +convert_filter_init(gcc_unused const config_param ¶m, + gcc_unused Error &error) +{ + return new ConvertFilter(); +} + +bool +ConvertFilter::Set(const AudioFormat &_out_audio_format, Error &error) +{ + assert(in_audio_format.IsValid()); + assert(_out_audio_format.IsValid()); + + if (_out_audio_format == out_audio_format) + /* no change */ + return true; + + if (out_audio_format.IsValid()) { + out_audio_format.Clear(); + state->Close(); + } + + if (_out_audio_format == in_audio_format) + /* optimized special case: no-op */ + return true; + + if (!state->Open(in_audio_format, _out_audio_format, error)) + return false; + + out_audio_format = _out_audio_format; + return true; +} + +AudioFormat +ConvertFilter::Open(AudioFormat &audio_format, gcc_unused Error &error) +{ + assert(audio_format.IsValid()); + + in_audio_format = audio_format; + out_audio_format.Clear(); + + state.Construct(); + + return in_audio_format; +} + +void +ConvertFilter::Close() +{ + assert(in_audio_format.IsValid()); + + if (out_audio_format.IsValid()) + state->Close(); + + state.Destruct(); + + poison_undefined(&in_audio_format, sizeof(in_audio_format)); + poison_undefined(&out_audio_format, sizeof(out_audio_format)); +} + +const void * +ConvertFilter::FilterPCM(const void *src, size_t src_size, + size_t *dest_size_r, Error &error) +{ + assert(in_audio_format.IsValid()); + + if (!out_audio_format.IsValid()) { + /* optimized special case: no-op */ + *dest_size_r = src_size; + return src; + } + + return state->Convert(src, src_size, dest_size_r, + error); +} + +const struct filter_plugin convert_filter_plugin = { + "convert", + convert_filter_init, +}; + +bool +convert_filter_set(Filter *_filter, AudioFormat out_audio_format, + Error &error) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + + return filter->Set(out_audio_format, error); +} |