/*
* 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 "VolumeFilterPlugin.hxx"
#include "FilterPlugin.hxx"
#include "FilterInternal.hxx"
#include "FilterRegistry.hxx"
#include "conf.h"
#include "pcm_buffer.h"
#include "PcmVolume.hxx"
#include "audio_format.h"
#include <assert.h>
#include <string.h>
struct volume_filter {
struct filter filter;
/**
* The current volume, from 0 to #PCM_VOLUME_1.
*/
unsigned volume;
struct audio_format audio_format;
struct pcm_buffer buffer;
};
static inline GQuark
volume_quark(void)
{
return g_quark_from_static_string("pcm_volume");
}
static struct filter *
volume_filter_init(G_GNUC_UNUSED const struct config_param *param,
G_GNUC_UNUSED GError **error_r)
{
struct volume_filter *filter = g_new(struct volume_filter, 1);
filter_init(&filter->filter, &volume_filter_plugin);
filter->volume = PCM_VOLUME_1;
return &filter->filter;
}
static void
volume_filter_finish(struct filter *filter)
{
g_free(filter);
}
static const struct audio_format *
volume_filter_open(struct filter *_filter, struct audio_format *audio_format,
G_GNUC_UNUSED GError **error_r)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
filter->audio_format = *audio_format;
pcm_buffer_init(&filter->buffer);
return &filter->audio_format;
}
static void
volume_filter_close(struct filter *_filter)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
pcm_buffer_deinit(&filter->buffer);
}
static const void *
volume_filter_filter(struct filter *_filter, const void *src, size_t src_size,
size_t *dest_size_r, GError **error_r)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
bool success;
void *dest;
*dest_size_r = src_size;
if (filter->volume >= PCM_VOLUME_1)
/* optimized special case: 100% volume = no-op */
return src;
dest = pcm_buffer_get(&filter->buffer, src_size);
if (filter->volume <= 0) {
/* optimized special case: 0% volume = memset(0) */
/* XXX is this valid for all sample formats? What
about floating point? */
memset(dest, 0, src_size);
return dest;
}
memcpy(dest, src, src_size);
success = pcm_volume(dest, src_size,
sample_format(filter->audio_format.format),
filter->volume);
if (!success) {
g_set_error(error_r, volume_quark(), 0,
"pcm_volume() has failed");
return NULL;
}
return dest;
}
const struct filter_plugin volume_filter_plugin = {
"volume",
volume_filter_init,
volume_filter_finish,
volume_filter_open,
volume_filter_close,
volume_filter_filter,
};
unsigned
volume_filter_get(const struct filter *_filter)
{
const struct volume_filter *filter =
(const struct volume_filter *)_filter;
assert(filter->filter.plugin == &volume_filter_plugin);
assert(filter->volume <= PCM_VOLUME_1);
return filter->volume;
}
void
volume_filter_set(struct filter *_filter, unsigned volume)
{
struct volume_filter *filter = (struct volume_filter *)_filter;
assert(filter->filter.plugin == &volume_filter_plugin);
assert(volume <= PCM_VOLUME_1);
filter->volume = volume;
}