120 lines
3.2 KiB
C++
120 lines
3.2 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 "ConvertFilterPlugin.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 "conf.h"
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#include "PcmConvert.hxx"
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#include "util/Manual.hxx"
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#include "audio_format.h"
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#include "poison.h"
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#include <assert.h>
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#include <string.h>
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class ConvertFilter final : public Filter {
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/**
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* The input audio format; PCM data is passed to the filter()
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* method in this format.
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*/
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audio_format in_audio_format;
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/**
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* The output audio format; the consumer of this plugin
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* expects PCM data in this format. This defaults to
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* #in_audio_format, and can be set with convert_filter_set().
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*/
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audio_format out_audio_format;
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Manual<PcmConvert> state;
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public:
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void Set(const audio_format &_out_audio_format) {
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assert(audio_format_valid(&in_audio_format));
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assert(audio_format_valid(&out_audio_format));
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assert(audio_format_valid(&_out_audio_format));
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out_audio_format = _out_audio_format;
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}
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virtual const audio_format *Open(audio_format &af, GError **error_r);
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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, GError **error_r);
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};
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static Filter *
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convert_filter_init(gcc_unused const struct config_param *param,
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gcc_unused GError **error_r)
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{
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return new ConvertFilter();
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}
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const struct audio_format *
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ConvertFilter::Open(audio_format &audio_format, gcc_unused GError **error_r)
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{
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assert(audio_format_valid(&audio_format));
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in_audio_format = out_audio_format = audio_format;
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state.Construct();
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return &in_audio_format;
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}
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void
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ConvertFilter::Close()
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{
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state.Destruct();
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poison_undefined(&in_audio_format, sizeof(in_audio_format));
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poison_undefined(&out_audio_format, sizeof(out_audio_format));
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}
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const void *
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ConvertFilter::FilterPCM(const void *src, size_t src_size,
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size_t *dest_size_r, GError **error_r)
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{
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if (audio_format_equals(&in_audio_format, &out_audio_format)) {
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/* optimized special case: no-op */
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*dest_size_r = src_size;
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return src;
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}
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return state->Convert(&in_audio_format,
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src, src_size,
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&out_audio_format, dest_size_r,
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error_r);
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}
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const struct filter_plugin convert_filter_plugin = {
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"convert",
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convert_filter_init,
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};
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void
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convert_filter_set(Filter *_filter, const audio_format &out_audio_format)
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{
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ConvertFilter *filter = (ConvertFilter *)_filter;
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filter->Set(out_audio_format);
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}
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