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/*
* 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 "pcm/PcmConvert.hxx"
#include "util/Manual.hxx"
#include "AudioFormat.hxx"
#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.
*/
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);
}
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