encoder: new encoder plugin which just pass data through

Makefile.am

@@ -494,6 +494,7 @@ ENCODER_SRC =
 
 if ENABLE_ENCODER
 ENCODER_SRC += src/encoder_list.c
+ENCODER_SRC += src/encoder/none_encoder.c
 
 if ENABLE_VORBIS_ENCODER
 ENCODER_SRC += src/encoder/vorbis_encoder.c

src/encoder/none_encoder.c

@@ -0,0 +1,124 @@
+/*
+ * 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 "encoder_api.h"
+#include "encoder_plugin.h"
+#include "audio_format.h"
+
+#include <assert.h>
+#include <string.h>
+
+#define MAX_BUFFER 32768
+
+struct none_encoder {
+	struct encoder encoder;
+
+	struct audio_format audio_format;
+
+	unsigned char buffer[MAX_BUFFER];
+	size_t buffer_length;
+};
+
+extern const struct encoder_plugin none_encoder_plugin;
+
+static inline GQuark
+none_encoder_quark(void)
+{
+	return g_quark_from_static_string("none_encoder");
+}
+
+static struct encoder *
+none_encoder_init(G_GNUC_UNUSED const struct config_param *param,
+		  G_GNUC_UNUSED GError **error)
+{
+	struct none_encoder *encoder;
+
+	encoder = g_new(struct none_encoder, 1);
+	encoder_struct_init(&encoder->encoder, &none_encoder_plugin);
+
+	return &encoder->encoder;
+}
+
+static void
+none_encoder_finish(struct encoder *_encoder)
+{
+	struct none_encoder *encoder = (struct none_encoder *)_encoder;
+
+	g_free(encoder);
+}
+
+static bool
+none_encoder_open(struct encoder *_encoder, struct audio_format *audio_format,
+		  G_GNUC_UNUSED GError **error)
+{
+	struct none_encoder *encoder = (struct none_encoder *)_encoder;
+
+	encoder->audio_format = *audio_format;
+	encoder->buffer_length = 0;
+
+	return true;
+}
+
+static void
+none_encoder_close(G_GNUC_UNUSED struct encoder *_encoder)
+{
+}
+
+static bool
+none_encoder_write(struct encoder *_encoder,
+		   const void *data, size_t length,
+		   G_GNUC_UNUSED GError **error)
+{
+	struct none_encoder *encoder = (struct none_encoder *)_encoder;
+
+	assert(length + encoder->buffer_length < MAX_BUFFER);
+
+	memcpy(encoder->buffer+encoder->buffer_length,
+		data, length);
+
+	encoder->buffer_length += length;
+	return true;
+}
+
+static size_t
+none_encoder_read(struct encoder *_encoder, void *dest, size_t length)
+{
+	struct none_encoder *encoder = (struct none_encoder *)_encoder;
+
+	if (length > encoder->buffer_length)
+		length = encoder->buffer_length;
+
+	memcpy(dest, encoder->buffer, length);
+
+	encoder->buffer_length -= length;
+	memmove(encoder->buffer, encoder->buffer + length,
+		encoder->buffer_length);
+
+	return length;
+}
+
+const struct encoder_plugin none_encoder_plugin = {
+	.name = "none",
+	.init = none_encoder_init,
+	.finish = none_encoder_finish,
+	.open = none_encoder_open,
+	.close = none_encoder_close,
+	.write = none_encoder_write,
+	.read = none_encoder_read,
+};

src/encoder_list.c

@@ -23,11 +23,13 @@
 
 #include <string.h>
 
+extern const struct encoder_plugin none_encoder_plugin;
 extern const struct encoder_plugin vorbis_encoder_plugin;
 extern const struct encoder_plugin lame_encoder_plugin;
 extern const struct encoder_plugin twolame_encoder_plugin;
 
 static const struct encoder_plugin *encoder_plugins[] = {
+	&none_encoder_plugin,
 #ifdef ENABLE_VORBIS_ENCODER
 	&vorbis_encoder_plugin,
 #endif