145 lines
3.7 KiB
C++
145 lines
3.7 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 "filter_plugin.h"
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#include "filter_internal.h"
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#include "filter_registry.h"
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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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struct ConvertFilter {
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struct filter base;
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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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struct 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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struct audio_format out_audio_format;
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Manual<PcmConvert> state;
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ConvertFilter() {
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filter_init(&base, &convert_filter_plugin);
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}
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};
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static struct 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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ConvertFilter *filter = new ConvertFilter();
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return &filter->base;
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}
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static void
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convert_filter_finish(struct filter *filter)
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{
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delete filter;
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}
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static const struct audio_format *
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convert_filter_open(struct filter *_filter, struct audio_format *audio_format,
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gcc_unused GError **error_r)
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{
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ConvertFilter *filter = (ConvertFilter *)_filter;
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assert(audio_format_valid(audio_format));
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filter->in_audio_format = filter->out_audio_format = *audio_format;
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filter->state.Construct();
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return &filter->in_audio_format;
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}
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static void
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convert_filter_close(struct filter *_filter)
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{
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ConvertFilter *filter = (ConvertFilter *)_filter;
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filter->state.Destruct();
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poison_undefined(&filter->in_audio_format,
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sizeof(filter->in_audio_format));
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poison_undefined(&filter->out_audio_format,
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sizeof(filter->out_audio_format));
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}
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static const void *
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convert_filter_filter(struct filter *_filter, 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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ConvertFilter *filter = (ConvertFilter *)_filter;
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const void *dest;
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if (audio_format_equals(&filter->in_audio_format,
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&filter->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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dest = filter->state->Convert(&filter->in_audio_format,
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src, src_size,
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&filter->out_audio_format, dest_size_r,
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error_r);
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if (dest == NULL)
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return NULL;
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return dest;
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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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convert_filter_finish,
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convert_filter_open,
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convert_filter_close,
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convert_filter_filter,
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};
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void
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convert_filter_set(struct filter *_filter,
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const struct audio_format *out_audio_format)
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{
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ConvertFilter *filter = (ConvertFilter *)_filter;
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assert(filter != NULL);
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assert(audio_format_valid(&filter->in_audio_format));
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assert(audio_format_valid(&filter->out_audio_format));
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assert(out_audio_format != NULL);
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assert(audio_format_valid(out_audio_format));
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filter->out_audio_format = *out_audio_format;
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}
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