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+/* $Id$ */
+/*
+ * Copyright (C) 2010-2011 Teluu Inc. (http://www.teluu.com)
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef __PJMEDIA_CONVERTER_H__
+#define __PJMEDIA_CONVERTER_H__
+
+
+/**
+ * @file pjmedia/converter.h Format conversion utilities
+ * @brief Format conversion utilities
+ */
+
+#include <pjmedia/frame.h>
+#include <pjmedia/format.h>
+#include <pj/list.h>
+#include <pj/pool.h>
+
+
+/**
+ * @defgroup PJMEDIA_CONVERTER Format converter
+ * @ingroup PJMEDIA_FRAME_OP
+ * @brief Audio and video converter utilities
+ * @{
+ */
+
+PJ_BEGIN_DECL
+
+/**
+ * This describes conversion parameter. It specifies the source and
+ * destination formats of the conversion.
+ */
+typedef struct pjmedia_conversion_param
+{
+    pjmedia_format	src;	/**< Source format.		*/
+    pjmedia_format	dst;	/**< Destination format.	*/
+} pjmedia_conversion_param;
+
+
+/** Forward declaration of factory operation structure */
+typedef struct pjmedia_converter_factory_op pjmedia_converter_factory_op;
+
+/**
+ * Converter priority guides. Converter priority determines which converter
+ * instance to be used if more than one converters are able to perform the
+ * requested conversion. Converter implementor can use this value to order
+ * the preference based on attributes such as quality or performance. Higher
+ * number indicates higher priority.
+ */
+typedef enum pjmedia_converter_priority_guide
+{
+    /** Lowest priority. */
+    PJMEDIA_CONVERTER_PRIORITY_LOWEST 		= 0,
+
+    /** Normal priority. */
+    PJMEDIA_CONVERTER_PRIORITY_NORMAL 		= 15000,
+
+    /** Highest priority. */
+    PJMEDIA_CONVERTER_PRIORITY_HIGHEST 		= 32000
+} pjmedia_converter_priority_guide;
+
+/**
+ * Converter factory. The converter factory registers a callback function
+ * to create converters.
+ */
+typedef struct pjmedia_converter_factory
+{
+    /**
+     * Standard list members.
+     */
+    PJ_DECL_LIST_MEMBER(struct pjmedia_converter_factory);
+
+    /**
+     * Factory name.
+     */
+    const char 			 *name;
+
+    /**
+     * Converter priority determines which converter instance to be used if
+     * more than one converters are able to perform the requested conversion.
+     * Converter implementor can use this value to order the preference based
+     * on attributes such as quality or performance. Higher number indicates
+     * higher priority. The pjmedia_converter_priority_guide enumeration shall
+     * be used as the base value to set the priority.
+     */
+    int priority;
+
+    /**
+     * Pointer to factory operation.
+     */
+    pjmedia_converter_factory_op *op;
+
+} pjmedia_converter_factory;
+
+/** Forward declaration for converter operation. */
+typedef struct pjmedia_converter_op pjmedia_converter_op;
+
+/**
+ * This structure describes a converter instance.
+ */
+typedef struct pjmedia_converter
+{
+    /**
+     * Pointer to converter operation.
+     */
+    pjmedia_converter_op *op;
+
+} pjmedia_converter;
+
+
+/**
+ * Converter factory operation.
+ */
+struct pjmedia_converter_factory_op
+{
+    /**
+     * This function creates a converter with the specified conversion format,
+     * if such format is supported.
+     *
+     * @param cf	The converter factory.
+     * @param pool	Pool to allocate memory from.
+     * @param prm	Conversion parameter.
+     * @param p_cv	Pointer to hold the created converter instance.
+     *
+     * @return		PJ_SUCCESS if converter has been created successfully.
+     */
+    pj_status_t (*create_converter)(pjmedia_converter_factory *cf,
+				    pj_pool_t *pool,
+				    const pjmedia_conversion_param *prm,
+				    pjmedia_converter **p_cv);
+
+    /**
+     * Destroy the factory.
+     *
+     * @param cf	The converter factory.
+     */
+    void (*destroy_factory)(pjmedia_converter_factory *cf);
+};
+
+/**
+ * Converter operation.
+ */
+struct pjmedia_converter_op
+{
+    /**
+     * Convert the buffer in the source frame and save the result in the
+     * buffer of the destination frame, according to conversion format that
+     * was specified when the converter was created.
+     *
+     * Note that application should use #pjmedia_converter_convert() instead
+     * of calling this function directly.
+     *
+     * @param cv	The converter instance.
+     * @param src_frame	The source frame.
+     * @param dst_frame	The destination frame.
+     *
+     * @return		PJ_SUCCESS if conversion has been performed
+     * 			successfully.
+     */
+    pj_status_t (*convert)(pjmedia_converter *cv,
+			   pjmedia_frame *src_frame,
+			   pjmedia_frame *dst_frame);
+
+    /**
+     * Destroy the converter instance.
+     *
+     * Note that application should use #pjmedia_converter_destroy() instead
+     * of calling this function directly.
+     *
+     * @param cv	The converter.
+     */
+    void (*destroy)(pjmedia_converter *cv);
+
+};
+
+
+/**
+ * Opaque data type for conversion manager. Typically, the conversion manager
+ * is a singleton instance, although application may instantiate more than one
+ * instances of this if required.
+ */
+typedef struct pjmedia_converter_mgr pjmedia_converter_mgr;
+
+
+/**
+ * Create a new conversion manager instance. This will also set the pointer
+ * to the singleton instance if the value is still NULL.
+ *
+ * @param pool		Pool to allocate memory from.
+ * @param mgr		Pointer to hold the created instance of the
+ * 			conversion manager.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_converter_mgr_create(pj_pool_t *pool,
+						  pjmedia_converter_mgr **mgr);
+
+/**
+ * Get the singleton instance of the conversion manager.
+ *
+ * @return		The instance.
+ */
+PJ_DECL(pjmedia_converter_mgr*) pjmedia_converter_mgr_instance(void);
+
+/**
+ * Manually assign a specific video manager instance as the singleton
+ * instance. Normally this is not needed if only one instance is ever
+ * going to be created, as the library automatically assign the singleton
+ * instance.
+ *
+ * @param mgr		The instance to be used as the singleton instance.
+ * 			Application may specify NULL to clear the singleton
+ * 			singleton instance.
+ */
+PJ_DECL(void) pjmedia_converter_mgr_set_instance(pjmedia_converter_mgr *mgr);
+
+/**
+ * Destroy a converter manager. If the manager happens to be the singleton
+ * instance, the singleton instance will be set to NULL.
+ *
+ * @param mgr		The converter manager. Specify NULL to use
+ * 			the singleton instance.
+ */
+PJ_DECL(void) pjmedia_converter_mgr_destroy(pjmedia_converter_mgr *mgr);
+
+/**
+ * Register a converter factory to the converter manager.
+ *
+ * @param mgr		The converter manager. Specify NULL to use
+ * 			the singleton instance.
+ * @param f		The converter factory to be registered.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t)
+pjmedia_converter_mgr_register_factory(pjmedia_converter_mgr *mgr,
+				       pjmedia_converter_factory *f);
+
+/**
+ * Unregister a previously registered converter factory from the converter
+ * manager.
+ *
+ * @param mgr		The converter manager. Specify NULL to use
+ * 			the singleton instance.
+ * @param f		The converter factory to be unregistered.
+ * @param call_destroy	If this is set to non-zero, the \a destroy_factory()
+ * 			callback of the factory will be called while
+ * 			unregistering the factory from the manager.
+ *
+ * @return		PJ_SUCCESS on success or the appropriate error code.
+ */
+PJ_DECL(pj_status_t)
+pjmedia_converter_mgr_unregister_factory(pjmedia_converter_mgr *mgr,
+				         pjmedia_converter_factory *f,
+				         pj_bool_t call_destroy);
+
+/**
+ * Create a converter instance to perform the specified format conversion
+ * as specified in \a param.
+ *
+ * @param mgr		The converter manager. Specify NULL to use
+ * 			the singleton instance.
+ * @param pool		Pool to allocate the memory from.
+ * @param param		Conversion parameter.
+ * @param p_cv		Pointer to hold the created converter.
+ *
+ * @return		PJ_SUCCESS if a converter has been created successfully
+ * 			or the appropriate error code.
+ */
+PJ_DECL(pj_status_t) pjmedia_converter_create(pjmedia_converter_mgr *mgr,
+					      pj_pool_t *pool,
+					      pjmedia_conversion_param *param,
+					      pjmedia_converter **p_cv);
+
+/**
+ * Convert the buffer in the source frame and save the result in the
+ * buffer of the destination frame, according to conversion format that
+ * was specified when the converter was created.
+ *
+ * @param cv		The converter instance.
+ * @param src_frame	The source frame.
+ * @param dst_frame	The destination frame.
+ *
+ * @return		PJ_SUCCESS if conversion has been performed
+ * 			successfully.
+ */
+PJ_DECL(pj_status_t) pjmedia_converter_convert(pjmedia_converter *cv,
+					       pjmedia_frame *src_frame,
+					       pjmedia_frame *dst_frame);
+
+/**
+ * Destroy the converter.
+ *
+ * @param cv		The converter instance.
+ */
+PJ_DECL(void) pjmedia_converter_destroy(pjmedia_converter *cv);
+
+
+PJ_END_DECL
+
+/**
+ * @}
+ */
+
+
+#endif /* __PJMEDIA_CONVERTER_H__ */
+
+