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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 "AutoConvertFilterPlugin.hxx"
#include "ConvertFilterPlugin.hxx"
#include "filter_plugin.h"
#include "filter_internal.h"
#include "filter_registry.h"
#include "audio_format.h"
#include <assert.h>
struct AutoConvertFilter {
struct filter base;
/**
* The audio format being fed to the underlying filter. This
* plugin actually doesn't need this variable, we have it here
* just so our open() method doesn't return a stack pointer.
*/
struct audio_format in_audio_format;
/**
* The underlying filter.
*/
struct filter *filter;
/**
* A convert_filter, just in case conversion is needed. nullptr
* if unused.
*/
struct filter *convert;
AutoConvertFilter(const filter_plugin &plugin, struct filter *_filter)
:filter(_filter) {
filter_init(&base, &plugin);
}
~AutoConvertFilter() {
filter_free(filter);
}
};
static void
autoconvert_filter_finish(struct filter *_filter)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
delete filter;
}
static const struct audio_format *
autoconvert_filter_open(struct filter *_filter,
struct audio_format *in_audio_format,
GError **error_r)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
const struct audio_format *out_audio_format;
assert(audio_format_valid(in_audio_format));
/* open the "real" filter */
filter->in_audio_format = *in_audio_format;
out_audio_format = filter_open(filter->filter,
&filter->in_audio_format, error_r);
if (out_audio_format == nullptr)
return nullptr;
/* need to convert? */
if (!audio_format_equals(&filter->in_audio_format, in_audio_format)) {
/* yes - create a convert_filter */
struct audio_format audio_format2 = *in_audio_format;
const struct audio_format *audio_format3;
filter->convert = filter_new(&convert_filter_plugin, nullptr,
error_r);
if (filter->convert == nullptr) {
filter_close(filter->filter);
return nullptr;
}
audio_format3 = filter_open(filter->convert, &audio_format2,
error_r);
if (audio_format3 == nullptr) {
filter_free(filter->convert);
filter_close(filter->filter);
return nullptr;
}
assert(audio_format_equals(&audio_format2, in_audio_format));
convert_filter_set(filter->convert, &filter->in_audio_format);
} else
/* no */
filter->convert = nullptr;
return out_audio_format;
}
static void
autoconvert_filter_close(struct filter *_filter)
{
AutoConvertFilter *filter =
(AutoConvertFilter *)_filter;
if (filter->convert != nullptr) {
filter_close(filter->convert);
filter_free(filter->convert);
}
filter_close(filter->filter);
}
static const void *
autoconvert_filter_filter(struct filter *_filter, const void *src,
size_t src_size, size_t *dest_size_r,
GError **error_r)
{
AutoConvertFilter *filter = (AutoConvertFilter *)_filter;
if (filter->convert != nullptr) {
src = filter_filter(filter->convert, src, src_size, &src_size,
error_r);
if (src == nullptr)
return nullptr;
}
return filter_filter(filter->filter, src, src_size, dest_size_r,
error_r);
}
static const struct filter_plugin autoconvert_filter_plugin = {
"convert",
nullptr,
autoconvert_filter_finish,
autoconvert_filter_open,
autoconvert_filter_close,
autoconvert_filter_filter,
};
struct filter *
autoconvert_filter_new(struct filter *_filter)
{
AutoConvertFilter *filter =
new AutoConvertFilter(autoconvert_filter_plugin,
_filter);
return &filter->base;
}
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