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authorMax Kellermann <max@duempel.org>2010-02-14 17:04:39 +0100
committerMax Kellermann <max@duempel.org>2010-02-17 07:23:13 +0100
commit752dfb3d95482c562e5d24c6ea839c4815de9a6d (patch)
tree46b62f26c4c68ebe81b72b9ca30366ffa14af1a5 /src/filter
parent5e0117b4441f257fcb1aab48b42a787567ebcbe6 (diff)
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replay_gain: reimplement as a filter plugin
Apply the replay gain in the output thread. This means a new setting will be active instantly, without going through the whole music pipe. And we might have different replay gain settings for each audio output device.
Diffstat (limited to 'src/filter')
-rw-r--r--src/filter/replay_gain_filter_plugin.c193
-rw-r--r--src/filter/replay_gain_filter_plugin.h37
2 files changed, 230 insertions, 0 deletions
diff --git a/src/filter/replay_gain_filter_plugin.c b/src/filter/replay_gain_filter_plugin.c
new file mode 100644
index 000000000..396f185cc
--- /dev/null
+++ b/src/filter/replay_gain_filter_plugin.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2003-2010 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 "filter/replay_gain_filter_plugin.h"
+#include "filter_plugin.h"
+#include "filter_internal.h"
+#include "filter_registry.h"
+#include "audio_format.h"
+#include "pcm_buffer.h"
+#include "pcm_volume.h"
+#include "replay_gain_info.h"
+#include "replay_gain_config.h"
+
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "replay_gain"
+
+struct replay_gain_filter {
+ struct filter filter;
+
+ enum replay_gain_mode mode;
+
+ struct replay_gain_info info;
+
+ /**
+ * The current volume, between 0 and #PCM_VOLUME_1 (both
+ * including).
+ */
+ unsigned volume;
+
+ struct audio_format audio_format;
+
+ struct pcm_buffer buffer;
+};
+
+static inline GQuark
+replay_gain_quark(void)
+{
+ return g_quark_from_static_string("replay_gain");
+}
+
+/**
+ * Recalculates the new volume after a property was changed.
+ */
+static void
+replay_gain_filter_update(struct replay_gain_filter *filter)
+{
+ if (filter->mode != REPLAY_GAIN_OFF) {
+ const struct replay_gain_tuple *tuple =
+ &filter->info.tuples[filter->mode];
+ float scale = replay_gain_tuple_defined(tuple)
+ ? replay_gain_tuple_scale(tuple, replay_gain_preamp)
+ : replay_gain_missing_preamp;
+ g_debug("scale=%f\n", (double)scale);
+
+ filter->volume = pcm_float_to_volume(scale);
+ } else
+ filter->volume = PCM_VOLUME_1;
+}
+
+static struct filter *
+replay_gain_filter_init(G_GNUC_UNUSED const struct config_param *param,
+ G_GNUC_UNUSED GError **error_r)
+{
+ struct replay_gain_filter *filter = g_new(struct replay_gain_filter, 1);
+
+ filter_init(&filter->filter, &replay_gain_filter_plugin);
+
+ filter->mode = replay_gain_mode;
+ replay_gain_info_init(&filter->info);
+ filter->volume = PCM_VOLUME_1;
+
+ return &filter->filter;
+}
+
+static void
+replay_gain_filter_finish(struct filter *filter)
+{
+ g_free(filter);
+}
+
+static const struct audio_format *
+replay_gain_filter_open(struct filter *_filter,
+ struct audio_format *audio_format,
+ G_GNUC_UNUSED GError **error_r)
+{
+ struct replay_gain_filter *filter =
+ (struct replay_gain_filter *)_filter;
+
+ audio_format->reverse_endian = false;
+
+ filter->audio_format = *audio_format;
+ pcm_buffer_init(&filter->buffer);
+
+ return &filter->audio_format;
+}
+
+static void
+replay_gain_filter_close(struct filter *_filter)
+{
+ struct replay_gain_filter *filter =
+ (struct replay_gain_filter *)_filter;
+
+ pcm_buffer_deinit(&filter->buffer);
+}
+
+static const void *
+replay_gain_filter_filter(struct filter *_filter,
+ const void *src, size_t src_size,
+ size_t *dest_size_r, GError **error_r)
+{
+ struct replay_gain_filter *filter =
+ (struct replay_gain_filter *)_filter;
+ bool success;
+ void *dest;
+
+ /* check if the mode has been changed since the last call */
+ if (filter->mode != replay_gain_mode) {
+ filter->mode = replay_gain_mode;
+ replay_gain_filter_update(filter);
+ }
+
+ *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);
+ *dest_size_r = 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, &filter->audio_format,
+ filter->volume);
+ if (!success) {
+ g_set_error(error_r, replay_gain_quark(), 0,
+ "pcm_volume() has failed");
+ return NULL;
+ }
+
+ return dest;
+}
+
+const struct filter_plugin replay_gain_filter_plugin = {
+ .name = "replay_gain",
+ .init = replay_gain_filter_init,
+ .finish = replay_gain_filter_finish,
+ .open = replay_gain_filter_open,
+ .close = replay_gain_filter_close,
+ .filter = replay_gain_filter_filter,
+};
+
+void
+replay_gain_filter_set_info(struct filter *_filter,
+ const struct replay_gain_info *info)
+{
+ struct replay_gain_filter *filter =
+ (struct replay_gain_filter *)_filter;
+
+ if (info != NULL)
+ filter->info = *info;
+ else
+ replay_gain_info_init(&filter->info);
+
+ replay_gain_filter_update(filter);
+}
diff --git a/src/filter/replay_gain_filter_plugin.h b/src/filter/replay_gain_filter_plugin.h
new file mode 100644
index 000000000..4ab9f42a6
--- /dev/null
+++ b/src/filter/replay_gain_filter_plugin.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2003-2010 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.
+ */
+
+#ifndef REPLAY_GAIN_FILTER_PLUGIN_H
+#define REPLAY_GAIN_FILTER_PLUGIN_H
+
+#include "replay_gain_info.h"
+
+struct filter;
+
+/**
+ * Sets a new #replay_gain_info at the beginning of a new song.
+ *
+ * @param info the new #replay_gain_info value, or NULL if no replay
+ * gain data is available for the current song
+ */
+void
+replay_gain_filter_set_info(struct filter *filter,
+ const struct replay_gain_info *info);
+
+#endif