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Diffstat (limited to '')
-rw-r--r-- | src/filter/ConvertFilterPlugin.cxx | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/filter/ConvertFilterPlugin.cxx b/src/filter/ConvertFilterPlugin.cxx new file mode 100644 index 000000000..2c6907655 --- /dev/null +++ b/src/filter/ConvertFilterPlugin.cxx @@ -0,0 +1,119 @@ +/* + * Copyright (C) 2003-2013 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 "FilterPlugin.hxx" +#include "FilterInternal.hxx" +#include "FilterRegistry.hxx" +#include "conf.h" +#include "PcmConvert.hxx" +#include "util/Manual.hxx" +#include "audio_format.h" +#include "poison.h" + +#include <assert.h> +#include <string.h> + +class ConvertFilter final : public Filter { + /** + * The input audio format; PCM data is passed to the filter() + * method in this format. + */ + audio_format in_audio_format; + + /** + * The output audio format; the consumer of this plugin + * expects PCM data in this format. This defaults to + * #in_audio_format, and can be set with convert_filter_set(). + */ + audio_format out_audio_format; + + Manual<PcmConvert> state; + +public: + void Set(const audio_format &_out_audio_format) { + assert(audio_format_valid(&in_audio_format)); + assert(audio_format_valid(&out_audio_format)); + assert(audio_format_valid(&_out_audio_format)); + + out_audio_format = _out_audio_format; + } + + virtual const audio_format *Open(audio_format &af, GError **error_r); + virtual void Close(); + virtual const void *FilterPCM(const void *src, size_t src_size, + size_t *dest_size_r, GError **error_r); +}; + +static Filter * +convert_filter_init(gcc_unused const struct config_param *param, + gcc_unused GError **error_r) +{ + return new ConvertFilter(); +} + +const struct audio_format * +ConvertFilter::Open(audio_format &audio_format, gcc_unused GError **error_r) +{ + assert(audio_format_valid(&audio_format)); + + in_audio_format = out_audio_format = audio_format; + state.Construct(); + + return &in_audio_format; +} + +void +ConvertFilter::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, GError **error_r) +{ + if (audio_format_equals(&in_audio_format, &out_audio_format)) { + /* optimized special case: no-op */ + *dest_size_r = src_size; + return src; + } + + return state->Convert(&in_audio_format, + src, src_size, + &out_audio_format, dest_size_r, + error_r); +} + +const struct filter_plugin convert_filter_plugin = { + "convert", + convert_filter_init, +}; + +void +convert_filter_set(Filter *_filter, const audio_format &out_audio_format) +{ + ConvertFilter *filter = (ConvertFilter *)_filter; + + filter->Set(out_audio_format); +} |