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authorMax Kellermann <max@duempel.org>2009-12-25 16:41:01 +0100
committerMax Kellermann <max@duempel.org>2009-12-25 17:51:05 +0100
commit6a17233f78d177bacc3b13fa4e8ac15fe08a4f51 (patch)
tree41a740e0bed19e3062a82479af3de7e7ac02140d /src
parentb54bde6f2b9f826cd7189182d733aada66c95dd8 (diff)
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filter: added the "autoconvert" filter plugin
Diffstat (limited to 'src')
-rw-r--r--src/filter/autoconvert_filter_plugin.c169
-rw-r--r--src/filter/autoconvert_filter_plugin.h34
2 files changed, 203 insertions, 0 deletions
diff --git a/src/filter/autoconvert_filter_plugin.c b/src/filter/autoconvert_filter_plugin.c
new file mode 100644
index 000000000..c862ffe23
--- /dev/null
+++ b/src/filter/autoconvert_filter_plugin.c
@@ -0,0 +1,169 @@
+/*
+ * 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 "config.h"
+#include "filter/autoconvert_filter_plugin.h"
+#include "filter/convert_filter_plugin.h"
+#include "filter_plugin.h"
+#include "filter_internal.h"
+#include "filter_registry.h"
+#include "conf.h"
+#include "pcm_convert.h"
+#include "audio_format.h"
+#include "poison.h"
+
+#include <assert.h>
+#include <string.h>
+
+struct autoconvert_filter {
+ 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. NULL
+ * if unused.
+ */
+ struct filter *convert;
+};
+
+static void
+autoconvert_filter_finish(struct filter *_filter)
+{
+ struct autoconvert_filter *filter =
+ (struct autoconvert_filter *)_filter;
+
+ filter_free(filter->filter);
+ g_free(filter);
+}
+
+static const struct audio_format *
+autoconvert_filter_open(struct filter *_filter,
+ struct audio_format *in_audio_format,
+ GError **error_r)
+{
+ struct autoconvert_filter *filter =
+ (struct autoconvert_filter *)_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 == NULL)
+ return NULL;
+
+ /* 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, NULL,
+ error_r);
+ if (filter->convert == NULL) {
+ filter_close(filter->filter);
+ return NULL;
+ }
+
+ audio_format3 = filter_open(filter->convert, &audio_format2,
+ error_r);
+ if (audio_format3 == NULL) {
+ filter_free(filter->convert);
+ filter_close(filter->filter);
+ return NULL;
+ }
+
+ assert(audio_format_equals(&audio_format2, in_audio_format));
+
+ convert_filter_set(filter->convert, &filter->in_audio_format);
+ } else
+ /* no */
+ filter->convert = NULL;
+
+ return out_audio_format;
+}
+
+static void
+autoconvert_filter_close(struct filter *_filter)
+{
+ struct autoconvert_filter *filter =
+ (struct autoconvert_filter *)_filter;
+
+ if (filter->convert != NULL) {
+ 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)
+{
+ struct autoconvert_filter *filter =
+ (struct autoconvert_filter *)_filter;
+
+ if (filter->convert != NULL) {
+ src = filter_filter(filter->convert, src, src_size, &src_size,
+ error_r);
+ if (src == NULL)
+ return NULL;
+ }
+
+ return filter_filter(filter->filter, src, src_size, dest_size_r,
+ error_r);
+}
+
+static const struct filter_plugin autoconvert_filter_plugin = {
+ .name = "convert",
+ .finish = autoconvert_filter_finish,
+ .open = autoconvert_filter_open,
+ .close = autoconvert_filter_close,
+ .filter = autoconvert_filter_filter,
+};
+
+struct filter *
+autoconvert_filter_new(struct filter *_filter)
+{
+ struct autoconvert_filter *filter =
+ g_new(struct autoconvert_filter, 1);
+
+ filter_init(&filter->base, &autoconvert_filter_plugin);
+ filter->filter = _filter;
+
+ return &filter->base;
+}
diff --git a/src/filter/autoconvert_filter_plugin.h b/src/filter/autoconvert_filter_plugin.h
new file mode 100644
index 000000000..cb98d6af2
--- /dev/null
+++ b/src/filter/autoconvert_filter_plugin.h
@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+
+#ifndef AUTOCONVERT_FILTER_PLUGIN_H
+#define AUTOCONVERT_FILTER_PLUGIN_H
+
+struct filter;
+
+/**
+ * Creates a new "autoconvert" filter. When opened, it ensures that
+ * the input audio format isn't changed. If the underlying filter
+ * requests a different format, it automatically creates a
+ * convert_filter.
+ */
+struct filter *
+autoconvert_filter_new(struct filter *filter);
+
+#endif