test: added program "run_filter"

This program runs filter plugins in an isolated environment.

.gitignore

@@ -45,6 +45,7 @@ doc/api
 test/software_volume
 test/run_decoder
 test/read_tags
+test/run_filter
 test/run_encoder
 test/run_output
 test/read_conf

Makefile.am

@@ -171,6 +171,7 @@ src_mpd_SOURCES = \
 	$(ENCODER_SRC) \
 	$(OUTPUT_API_SRC) $(OUTPUT_SRC) \
 	$(MIXER_API_SRC) $(MIXER_SRC) \
+	$(FILTER_SRC) \
 	src/notify.c \
 	src/audio.c \
 	src/audio_parser.c \
@@ -193,8 +194,6 @@ src_mpd_SOURCES = \
 	src/fifo_buffer.c \
 	src/filter_plugin.c \
 	src/filter_registry.c \
-	src/filter/null_filter_plugin.c \
-	src/filter/volume_filter_plugin.c \
 	src/update.c \
 	src/client.c \
 	src/listen.c \
@@ -575,6 +574,15 @@ OUTPUT_SRC += src/output/solaris_output_plugin.c
 endif
 
 
+#
+# Filter plugins
+#
+
+FILTER_SRC = \
+	src/filter/null_filter_plugin.c \
+	src/filter/volume_filter_plugin.c
+
+
 #
 # Sparse code analysis
 #
@@ -606,6 +614,7 @@ noinst_PROGRAMS = \
 	test/run_input \
 	test/run_decoder \
 	test/read_tags \
+	test/run_filter \
 	test/run_encoder \
 	test/run_output \
 	test/read_mixer \
@@ -669,6 +678,17 @@ test_read_tags_SOURCES = test/read_tags.c \
 	$(TAG_SRC) \
 	$(DECODER_SRC)
 
+test_run_filter_CPPFLAGS = $(AM_CPPFLAGS)
+test_run_filter_LDADD = $(MPD_LIBS) \
+	$(GLIB_LIBS)
+test_run_filter_SOURCES = test/run_filter.c \
+	src/filter_plugin.c \
+	src/filter_registry.c \
+	src/conf.c src/buffer2array.c src/utils.c \
+	src/pcm_volume.c \
+	src/audio_parser.c \
+	$(FILTER_SRC)
+
 test_run_encoder_SOURCES = test/run_encoder.c \
 	src/conf.c src/buffer2array.c \
 	src/utils.c \

test/run_filter.c

@@ -0,0 +1,174 @@
+/*
+ * 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 "conf.h"
+#include "audio_parser.h"
+#include "audio_format.h"
+#include "filter_plugin.h"
+#include "volume.h"
+#include "pcm_volume.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+int volume_level_get(void)
+{
+	return PCM_VOLUME_1;
+}
+
+static const struct config_param *
+find_named_config_block(const char *block, const char *name)
+{
+	const struct config_param *param = NULL;
+
+	while ((param = config_get_next_param(block, param)) != NULL) {
+		const char *current_name =
+			config_get_block_string(param, "name", NULL);
+		if (current_name != NULL && strcmp(current_name, name) == 0)
+			return param;
+	}
+
+	return NULL;
+}
+
+static struct filter *
+load_filter(const char *name)
+{
+	const struct config_param *param;
+	struct filter *filter;
+	GError *error = NULL;
+
+	param = find_named_config_block("filter", name);
+	if (param == NULL) {
+		g_printerr("No such configured filter: %s\n", name);
+		return false;
+	}
+
+	filter = filter_configured_new(param, &error);
+	if (filter == NULL) {
+		g_printerr("Failed to load filter: %s\n", error->message);
+		g_error_free(error);
+		return NULL;
+	}
+
+	return filter;
+}
+
+int main(int argc, char **argv)
+{
+	struct audio_format audio_format = {
+		.sample_rate = 44100,
+		.bits = 16,
+		.channels = 2,
+	};
+	bool success;
+	GError *error = NULL;
+	struct filter *filter;
+	const struct audio_format *out_audio_format;
+	char buffer[4096];
+	size_t frame_size;
+
+	if (argc < 3 || argc > 4) {
+		g_printerr("Usage: run_filter CONFIG NAME [FORMAT] <IN\n");
+		return 1;
+	}
+
+	g_thread_init(NULL);
+
+	/* read configuration file (mpd.conf) */
+
+	config_global_init();
+	config_read_file(argv[1]);
+
+	/* parse the audio format */
+
+	if (argc > 3) {
+		success = audio_format_parse(&audio_format, argv[3], &error);
+		if (!success) {
+			g_printerr("Failed to parse audio format: %s\n",
+				   error->message);
+			g_error_free(error);
+			return 1;
+		}
+	}
+
+	/* initialize the filter */
+
+	filter = load_filter(argv[2]);
+	if (filter == NULL)
+		return 1;
+
+	/* open the filter */
+
+	out_audio_format = filter_open(filter, &audio_format, &error);
+	if (out_audio_format == NULL) {
+		g_printerr("Failed to open filter: %s\n", error->message);
+		g_error_free(error);
+		filter_free(filter);
+		return 1;
+	}
+
+
+	g_printerr("audio_format=%u:%u:%u\n", out_audio_format->sample_rate,
+		   out_audio_format->bits, out_audio_format->channels);
+
+	frame_size = audio_format_frame_size(&audio_format);
+
+	/* play */
+
+	while (true) {
+		ssize_t nbytes;
+		size_t length;
+		const void *dest;
+
+		nbytes = read(0, buffer, sizeof(buffer));
+		if (nbytes <= 0)
+			break;
+
+		dest = filter_filter(filter, buffer, (size_t)nbytes,
+				     &length, &error);
+		if (dest == NULL) {
+			g_printerr("Filter failed: %s\n", error->message);
+			filter_close(filter);
+			filter_free(filter);
+			return 1;
+		}
+
+		nbytes = write(1, dest, length);
+		if (nbytes < 0) {
+			g_printerr("Failed to write: %s\n", strerror(errno));
+			filter_close(filter);
+			filter_free(filter);
+			return 1;
+		}
+	}
+
+	/* cleanup and exit */
+
+	filter_close(filter);
+	filter_free(filter);
+
+	config_global_finish();
+
+	return 0;
+}