9 files changed, 276 insertions, 244 deletions

diff --git a/Makefile.am b/Makefile.am
index f5c02041c..b76d1722a 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1047,6 +1047,7 @@ ENCODER_LIBS = \
 
 libencoder_plugins_a_SOURCES = \
 	src/encoder/EncoderAPI.hxx \
+	src/encoder/EncoderInterface.hxx \
 	src/encoder/EncoderPlugin.hxx \
 	src/encoder/plugins/OggStream.hxx \
 	src/encoder/plugins/NullEncoderPlugin.cxx \
diff --git a/src/encoder/EncoderAPI.hxx b/src/encoder/EncoderAPI.hxx
index 01ad5609a..40e78a658 100644
--- a/src/encoder/EncoderAPI.hxx
+++ b/src/encoder/EncoderAPI.hxx
@@ -27,6 +27,7 @@
 
 // IWYU pragma: begin_exports
 
+#include "EncoderInterface.hxx"
 #include "EncoderPlugin.hxx"
 #include "AudioFormat.hxx"
 #include "tag/Tag.hxx"
diff --git a/src/encoder/EncoderInterface.hxx b/src/encoder/EncoderInterface.hxx
new file mode 100644
index 000000000..165c5eeca
--- /dev/null
+++ b/src/encoder/EncoderInterface.hxx
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2003-2015 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 MPD_ENCODER_INTERFACE_HXX
+#define MPD_ENCODER_INTERFACE_HXX
+
+#include "EncoderPlugin.hxx"
+
+#include <assert.h>
+
+struct Encoder {
+	const EncoderPlugin &plugin;
+
+#ifndef NDEBUG
+	bool open, pre_tag, tag, end;
+#endif
+
+	explicit Encoder(const EncoderPlugin &_plugin)
+		:plugin(_plugin)
+#ifndef NDEBUG
+		, open(false)
+#endif
+	{}
+};
+
+/**
+ * Frees an encoder object.
+ *
+ * @param encoder the encoder
+ */
+static inline void
+encoder_finish(Encoder *encoder)
+{
+	assert(!encoder->open);
+
+	encoder->plugin.finish(encoder);
+}
+
+/**
+ * Opens an encoder object.  You must call this prior to using it.
+ * Before you free it, you must call encoder_close().  You may open
+ * and close (reuse) one encoder any number of times.
+ *
+ * After this function returns successfully and before the first
+ * encoder_write() call, you should invoke encoder_read() to obtain
+ * the file header.
+ *
+ * @param encoder the encoder
+ * @param audio_format the encoder's input audio format; the plugin
+ * may modify the struct to adapt it to its abilities
+ * @return true on success
+ */
+static inline bool
+encoder_open(Encoder *encoder, AudioFormat &audio_format,
+	     Error &error)
+{
+	assert(!encoder->open);
+
+	bool success = encoder->plugin.open(encoder, audio_format, error);
+#ifndef NDEBUG
+	encoder->open = success;
+	encoder->pre_tag = encoder->tag = encoder->end = false;
+#endif
+	return success;
+}
+
+/**
+ * Closes an encoder object.  This disables the encoder, and readies
+ * it for reusal by calling encoder_open() again.
+ *
+ * @param encoder the encoder
+ */
+static inline void
+encoder_close(Encoder *encoder)
+{
+	assert(encoder->open);
+
+	if (encoder->plugin.close != nullptr)
+		encoder->plugin.close(encoder);
+
+#ifndef NDEBUG
+	encoder->open = false;
+#endif
+}
+
+/**
+ * Ends the stream: flushes the encoder object, generate an
+ * end-of-stream marker (if applicable), make everything which might
+ * currently be buffered available by encoder_read().
+ *
+ * After this function has been called, the encoder may not be usable
+ * for more data, and only encoder_read() and encoder_close() can be
+ * called.
+ *
+ * @param encoder the encoder
+ * @return true on success
+ */
+static inline bool
+encoder_end(Encoder *encoder, Error &error)
+{
+	assert(encoder->open);
+	assert(!encoder->end);
+
+#ifndef NDEBUG
+	encoder->end = true;
+#endif
+
+	/* this method is optional */
+	return encoder->plugin.end != nullptr
+		? encoder->plugin.end(encoder, error)
+		: true;
+}
+
+/**
+ * Flushes an encoder object, make everything which might currently be
+ * buffered available by encoder_read().
+ *
+ * @param encoder the encoder
+ * @return true on success
+ */
+static inline bool
+encoder_flush(Encoder *encoder, Error &error)
+{
+	assert(encoder->open);
+	assert(!encoder->pre_tag);
+	assert(!encoder->tag);
+	assert(!encoder->end);
+
+	/* this method is optional */
+	return encoder->plugin.flush != nullptr
+		? encoder->plugin.flush(encoder, error)
+		: true;
+}
+
+/**
+ * Prepare for sending a tag to the encoder.  This is used by some
+ * encoders to flush the previous sub-stream, in preparation to begin
+ * a new one.
+ *
+ * @param encoder the encoder
+ * @param tag the tag object
+ * @return true on success
+ */
+static inline bool
+encoder_pre_tag(Encoder *encoder, Error &error)
+{
+	assert(encoder->open);
+	assert(!encoder->pre_tag);
+	assert(!encoder->tag);
+	assert(!encoder->end);
+
+	/* this method is optional */
+	bool success = encoder->plugin.pre_tag != nullptr
+		? encoder->plugin.pre_tag(encoder, error)
+		: true;
+
+#ifndef NDEBUG
+	encoder->pre_tag = success;
+#endif
+	return success;
+}
+
+/**
+ * Sends a tag to the encoder.
+ *
+ * Instructions: call encoder_pre_tag(); then obtain flushed data with
+ * encoder_read(); finally call encoder_tag().
+ *
+ * @param encoder the encoder
+ * @param tag the tag object
+ * @return true on success
+ */
+static inline bool
+encoder_tag(Encoder *encoder, const Tag &tag, Error &error)
+{
+	assert(encoder->open);
+	assert(!encoder->pre_tag);
+	assert(encoder->tag);
+	assert(!encoder->end);
+
+#ifndef NDEBUG
+	encoder->tag = false;
+#endif
+
+	/* this method is optional */
+	return encoder->plugin.tag != nullptr
+		? encoder->plugin.tag(encoder, tag, error)
+		: true;
+}
+
+/**
+ * Writes raw PCM data to the encoder.
+ *
+ * @param encoder the encoder
+ * @param data the buffer containing PCM samples
+ * @param length the length of the buffer in bytes
+ * @return true on success
+ */
+static inline bool
+encoder_write(Encoder *encoder, const void *data, size_t length,
+	      Error &error)
+{
+	assert(encoder->open);
+	assert(!encoder->pre_tag);
+	assert(!encoder->tag);
+	assert(!encoder->end);
+
+	return encoder->plugin.write(encoder, data, length, error);
+}
+
+/**
+ * Reads encoded data from the encoder.
+ *
+ * Call this repeatedly until no more data is returned.
+ *
+ * @param encoder the encoder
+ * @param dest the destination buffer to copy to
+ * @param length the maximum length of the destination buffer
+ * @return the number of bytes written to #dest
+ */
+static inline size_t
+encoder_read(Encoder *encoder, void *dest, size_t length)
+{
+	assert(encoder->open);
+	assert(!encoder->pre_tag || !encoder->tag);
+
+#ifndef NDEBUG
+	if (encoder->pre_tag) {
+		encoder->pre_tag = false;
+		encoder->tag = true;
+	}
+#endif
+
+	return encoder->plugin.read(encoder, dest, length);
+}
+
+/**
+ * Get mime type of encoded content.
+ *
+ * @param plugin the encoder plugin
+ * @return an constant string, nullptr on failure
+ */
+static inline const char *
+encoder_get_mime_type(Encoder *encoder)
+{
+	/* this method is optional */
+	return encoder->plugin.get_mime_type != nullptr
+		? encoder->plugin.get_mime_type(encoder)
+		: nullptr;
+}
+
+#endif
diff --git a/src/encoder/EncoderPlugin.hxx b/src/encoder/EncoderPlugin.hxx
index 59dc7751f..99a68dce6 100644
--- a/src/encoder/EncoderPlugin.hxx
+++ b/src/encoder/EncoderPlugin.hxx
@@ -20,31 +20,14 @@
 #ifndef MPD_ENCODER_PLUGIN_HXX
 #define MPD_ENCODER_PLUGIN_HXX
 
-#include <assert.h>
-#include <stdbool.h>
 #include <stddef.h>
 
-struct EncoderPlugin;
+struct Encoder;
 struct AudioFormat;
 struct config_param;
 struct Tag;
 class Error;
 
-struct Encoder {
-	const EncoderPlugin &plugin;
-
-#ifndef NDEBUG
-	bool open, pre_tag, tag, end;
-#endif
-
-	explicit Encoder(const EncoderPlugin &_plugin)
-		:plugin(_plugin)
-#ifndef NDEBUG
-		, open(false)
-#endif
-	{}
-};
-
 struct EncoderPlugin {
 	const char *name;
 
@@ -92,230 +75,4 @@ encoder_init(const EncoderPlugin &plugin, const config_param &param,
 	return plugin.init(param, error_r);
 }
 
-/**
- * Frees an encoder object.
- *
- * @param encoder the encoder
- */
-static inline void
-encoder_finish(Encoder *encoder)
-{
-	assert(!encoder->open);
-
-	encoder->plugin.finish(encoder);
-}
-
-/**
- * Opens an encoder object.  You must call this prior to using it.
- * Before you free it, you must call encoder_close().  You may open
- * and close (reuse) one encoder any number of times.
- *
- * After this function returns successfully and before the first
- * encoder_write() call, you should invoke encoder_read() to obtain
- * the file header.
- *
- * @param encoder the encoder
- * @param audio_format the encoder's input audio format; the plugin
- * may modify the struct to adapt it to its abilities
- * @return true on success
- */
-static inline bool
-encoder_open(Encoder *encoder, AudioFormat &audio_format,
-	     Error &error)
-{
-	assert(!encoder->open);
-
-	bool success = encoder->plugin.open(encoder, audio_format, error);
-#ifndef NDEBUG
-	encoder->open = success;
-	encoder->pre_tag = encoder->tag = encoder->end = false;
-#endif
-	return success;
-}
-
-/**
- * Closes an encoder object.  This disables the encoder, and readies
- * it for reusal by calling encoder_open() again.
- *
- * @param encoder the encoder
- */
-static inline void
-encoder_close(Encoder *encoder)
-{
-	assert(encoder->open);
-
-	if (encoder->plugin.close != nullptr)
-		encoder->plugin.close(encoder);
-
-#ifndef NDEBUG
-	encoder->open = false;
-#endif
-}
-
-/**
- * Ends the stream: flushes the encoder object, generate an
- * end-of-stream marker (if applicable), make everything which might
- * currently be buffered available by encoder_read().
- *
- * After this function has been called, the encoder may not be usable
- * for more data, and only encoder_read() and encoder_close() can be
- * called.
- *
- * @param encoder the encoder
- * @return true on success
- */
-static inline bool
-encoder_end(Encoder *encoder, Error &error)
-{
-	assert(encoder->open);
-	assert(!encoder->end);
-
-#ifndef NDEBUG
-	encoder->end = true;
-#endif
-
-	/* this method is optional */
-	return encoder->plugin.end != nullptr
-		? encoder->plugin.end(encoder, error)
-		: true;
-}
-
-/**
- * Flushes an encoder object, make everything which might currently be
- * buffered available by encoder_read().
- *
- * @param encoder the encoder
- * @return true on success
- */
-static inline bool
-encoder_flush(Encoder *encoder, Error &error)
-{
-	assert(encoder->open);
-	assert(!encoder->pre_tag);
-	assert(!encoder->tag);
-	assert(!encoder->end);
-
-	/* this method is optional */
-	return encoder->plugin.flush != nullptr
-		? encoder->plugin.flush(encoder, error)
-		: true;
-}
-
-/**
- * Prepare for sending a tag to the encoder.  This is used by some
- * encoders to flush the previous sub-stream, in preparation to begin
- * a new one.
- *
- * @param encoder the encoder
- * @param tag the tag object
- * @return true on success
- */
-static inline bool
-encoder_pre_tag(Encoder *encoder, Error &error)
-{
-	assert(encoder->open);
-	assert(!encoder->pre_tag);
-	assert(!encoder->tag);
-	assert(!encoder->end);
-
-	/* this method is optional */
-	bool success = encoder->plugin.pre_tag != nullptr
-		? encoder->plugin.pre_tag(encoder, error)
-		: true;
-
-#ifndef NDEBUG
-	encoder->pre_tag = success;
-#endif
-	return success;
-}
-
-/**
- * Sends a tag to the encoder.
- *
- * Instructions: call encoder_pre_tag(); then obtain flushed data with
- * encoder_read(); finally call encoder_tag().
- *
- * @param encoder the encoder
- * @param tag the tag object
- * @return true on success
- */
-static inline bool
-encoder_tag(Encoder *encoder, const Tag &tag, Error &error)
-{
-	assert(encoder->open);
-	assert(!encoder->pre_tag);
-	assert(encoder->tag);
-	assert(!encoder->end);
-
-#ifndef NDEBUG
-	encoder->tag = false;
-#endif
-
-	/* this method is optional */
-	return encoder->plugin.tag != nullptr
-		? encoder->plugin.tag(encoder, tag, error)
-		: true;
-}
-
-/**
- * Writes raw PCM data to the encoder.
- *
- * @param encoder the encoder
- * @param data the buffer containing PCM samples
- * @param length the length of the buffer in bytes
- * @return true on success
- */
-static inline bool
-encoder_write(Encoder *encoder, const void *data, size_t length,
-	      Error &error)
-{
-	assert(encoder->open);
-	assert(!encoder->pre_tag);
-	assert(!encoder->tag);
-	assert(!encoder->end);
-
-	return encoder->plugin.write(encoder, data, length, error);
-}
-
-/**
- * Reads encoded data from the encoder.
- *
- * Call this repeatedly until no more data is returned.
- *
- * @param encoder the encoder
- * @param dest the destination buffer to copy to
- * @param length the maximum length of the destination buffer
- * @return the number of bytes written to #dest
- */
-static inline size_t
-encoder_read(Encoder *encoder, void *dest, size_t length)
-{
-	assert(encoder->open);
-	assert(!encoder->pre_tag || !encoder->tag);
-
-#ifndef NDEBUG
-	if (encoder->pre_tag) {
-		encoder->pre_tag = false;
-		encoder->tag = true;
-	}
-#endif
-
-	return encoder->plugin.read(encoder, dest, length);
-}
-
-/**
- * Get mime type of encoded content.
- *
- * @param plugin the encoder plugin
- * @return an constant string, nullptr on failure
- */
-static inline const char *
-encoder_get_mime_type(Encoder *encoder)
-{
-	/* this method is optional */
-	return encoder->plugin.get_mime_type != nullptr
-		? encoder->plugin.get_mime_type(encoder)
-		: nullptr;
-}
-
 #endif
diff --git a/src/output/plugins/RecorderOutputPlugin.cxx b/src/output/plugins/RecorderOutputPlugin.cxx
index 295fb948c..fb73f7b6f 100644
--- a/src/output/plugins/RecorderOutputPlugin.cxx
+++ b/src/output/plugins/RecorderOutputPlugin.cxx
@@ -21,6 +21,7 @@
 #include "RecorderOutputPlugin.hxx"
 #include "../OutputAPI.hxx"
 #include "../Wrapper.hxx"
+#include "encoder/EncoderInterface.hxx"
 #include "encoder/EncoderPlugin.hxx"
 #include "encoder/EncoderList.hxx"
 #include "config/ConfigError.hxx"
diff --git a/src/output/plugins/ShoutOutputPlugin.cxx b/src/output/plugins/ShoutOutputPlugin.cxx
index 68c44605e..e5d8b23a4 100644
--- a/src/output/plugins/ShoutOutputPlugin.cxx
+++ b/src/output/plugins/ShoutOutputPlugin.cxx
@@ -20,6 +20,7 @@
 #include "config.h"
 #include "ShoutOutputPlugin.hxx"
 #include "../OutputAPI.hxx"
+#include "encoder/EncoderInterface.hxx"
 #include "encoder/EncoderPlugin.hxx"
 #include "encoder/EncoderList.hxx"
 #include "config/ConfigError.hxx"
diff --git a/src/output/plugins/httpd/HttpdOutputPlugin.cxx b/src/output/plugins/httpd/HttpdOutputPlugin.cxx
index 9a389570e..811cdaaff 100644
--- a/src/output/plugins/httpd/HttpdOutputPlugin.cxx
+++ b/src/output/plugins/httpd/HttpdOutputPlugin.cxx
@@ -22,6 +22,7 @@
 #include "HttpdInternal.hxx"
 #include "HttpdClient.hxx"
 #include "output/OutputAPI.hxx"
+#include "encoder/EncoderInterface.hxx"
 #include "encoder/EncoderPlugin.hxx"
 #include "encoder/EncoderList.hxx"
 #include "system/Resolver.hxx"
diff --git a/test/run_encoder.cxx b/test/run_encoder.cxx
index e48bbfc9e..c500b8e1f 100644
--- a/test/run_encoder.cxx
+++ b/test/run_encoder.cxx
@@ -20,6 +20,7 @@
 #include "config.h"
 #include "encoder/EncoderList.hxx"
 #include "encoder/EncoderPlugin.hxx"
+#include "encoder/EncoderInterface.hxx"
 #include "AudioFormat.hxx"
 #include "AudioParser.hxx"
 #include "config/ConfigData.hxx"
diff --git a/test/test_vorbis_encoder.cxx b/test/test_vorbis_encoder.cxx
index e716b8536..f01331ee5 100644
--- a/test/test_vorbis_encoder.cxx
+++ b/test/test_vorbis_encoder.cxx
@@ -20,6 +20,7 @@
 #include "config.h"
 #include "encoder/EncoderList.hxx"
 #include "encoder/EncoderPlugin.hxx"
+#include "encoder/EncoderInterface.hxx"
 #include "AudioFormat.hxx"
 #include "config/ConfigData.hxx"
 #include "stdbin.h"