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-rw-r--r--src/filter/volume_filter_plugin.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/src/filter/volume_filter_plugin.c b/src/filter/volume_filter_plugin.c
new file mode 100644
index 000000000..0a5e13a49
--- /dev/null
+++ b/src/filter/volume_filter_plugin.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2003-2009 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 "filter_plugin.h"
+#include "filter_internal.h"
+#include "filter_registry.h"
+#include "conf.h"
+#include "pcm_buffer.h"
+#include "pcm_volume.h"
+#include "volume.h"
+#include "audio_format.h"
+
+#include <assert.h>
+#include <string.h>
+
+struct volume_filter {
+ struct filter filter;
+
+ 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);
+ 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,
+ const struct audio_format *audio_format,
+ GError **error_r)
+{
+ struct volume_filter *filter = (struct volume_filter *)_filter;
+
+ if (audio_format->bits != 8 && audio_format->bits != 16 &&
+ audio_format->bits != 24) {
+ g_set_error(error_r, volume_quark(), 0,
+ "Unsupported audio format");
+ return false;
+ }
+
+ 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;
+ int volume;
+ bool success;
+ void *dest;
+
+ volume = volume_level_get(); /* XXX don't use volume_level_get() */
+ if (volume < 0 || volume >= PCM_VOLUME_1) {
+ /* optimized special case: 100% volume = no-op */
+ *dest_size_r = src_size;
+ return src;
+ }
+
+ dest = pcm_buffer_get(&filter->buffer, src_size);
+ *dest_size_r = src_size;
+
+ if (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, &filter->audio_format, 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 = {
+ .name = "volume",
+ .init = volume_filter_init,
+ .finish = volume_filter_finish,
+ .open = volume_filter_open,
+ .close = volume_filter_close,
+ .filter = volume_filter_filter,
+};