/*
* Copyright (C) 2012 Doubango Telecom <http://www.doubango.org>
*
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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 3 of the License, or
* (at your option) any later version.
*
* DOUBANGO 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 DOUBANGO.
*
*/

/**@file tmedia_converter_video.c
 * @brief Video converter plugin (chroma, rotation, scaling, ...)
 *
 * @author Mamadou Diop <diopmamadou(at)doubango[dot]org>
 *
 */
#include "tinymedia/tmedia_converter_video.h"

#include "tsk_debug.h"

/* pointer to all registered converter_videos */
static const tmedia_converter_video_plugin_def_t* __tmedia_converter_video_plugins[TMED_CONVERTER_VIDEO_MAX_PLUGINS] = {0};


tmedia_converter_video_t* tmedia_converter_video_create(tsk_size_t srcWidth, tsk_size_t srcHeight, tmedia_chroma_t srcChroma, tsk_size_t dstWidth, tsk_size_t dstHeight, tmedia_chroma_t dstChroma)
{
    tmedia_converter_video_t* converter = tsk_null;
    const tmedia_converter_video_plugin_def_t* plugin;
    tsk_size_t i = 0;

    while((i < TMED_CONVERTER_VIDEO_MAX_PLUGINS) && (plugin = __tmedia_converter_video_plugins[i++])) {
        if(plugin->objdef && (converter = tsk_object_new(plugin->objdef))) {
            converter->plugin = plugin;
            converter->scale_rotated_frames = tsk_true;
            // must not set other values beacause 'zero' is meaningful
            if(converter->plugin->init) {
                if(converter->plugin->init(converter, srcWidth, srcHeight, srcChroma, dstWidth, dstHeight, dstChroma)) {
                    TSK_DEBUG_ERROR("Failed to initialized the video converter");
                    TSK_OBJECT_SAFE_FREE(converter);
                    continue;
                }
            }
            converter->srcChroma = srcChroma;
            converter->dstChroma = dstChroma;
            converter->srcWidth = srcWidth ? srcWidth : dstWidth;
            converter->srcHeight = srcHeight ? srcHeight : dstHeight;
            converter->dstWidth = dstWidth ? dstWidth : srcWidth;
            converter->dstHeight = dstHeight ? dstHeight : srcHeight;
            break;
        }
    }

    return converter;
}

int tmedia_converter_video_plugin_register(const tmedia_converter_video_plugin_def_t* plugin)
{
    tsk_size_t i;
    if(!plugin) {
        TSK_DEBUG_ERROR("Invalid parameter");
        return -1;
    }

    /* add or replace the plugin */
    for(i = 0; i<TMED_CONVERTER_VIDEO_MAX_PLUGINS; i++) {
        if(!__tmedia_converter_video_plugins[i] || (__tmedia_converter_video_plugins[i] == plugin)) {
            __tmedia_converter_video_plugins[i] = plugin;
            return 0;
        }
    }

    TSK_DEBUG_ERROR("There are already %d plugins.", TMED_CONVERTER_VIDEO_MAX_PLUGINS);
    return -2;
}

tsk_size_t tmedia_converter_video_plugin_registry_count()
{
    tsk_size_t count;
    for(count = 0;
            count < TMED_CONVERTER_VIDEO_MAX_PLUGINS && __tmedia_converter_video_plugins[count];
            ++count) ;
    return count;
}

int tmedia_converter_video_plugin_unregister(const tmedia_converter_video_plugin_def_t* plugin)
{
    tsk_size_t i;
    tsk_bool_t found = tsk_false;
    if(!plugin) {
        TSK_DEBUG_ERROR("Invalid Parameter");
        return -1;
    }

    /* find the plugin to unregister */
    for(i = 0; i<TMED_CONVERTER_VIDEO_MAX_PLUGINS && __tmedia_converter_video_plugins[i]; i++) {
        if(__tmedia_converter_video_plugins[i] == plugin) {
            __tmedia_converter_video_plugins[i] = tsk_null;
            found = tsk_true;
            break;
        }
    }

    /* compact */
    if(found) {
        for(; i<(TMED_CONVERTER_VIDEO_MAX_PLUGINS - 1); i++) {
            if(__tmedia_converter_video_plugins[i+1]) {
                __tmedia_converter_video_plugins[i] = __tmedia_converter_video_plugins[i+1];
            }
            else {
                break;
            }
        }
        __tmedia_converter_video_plugins[i] = tsk_null;
    }
    return (found ? 0 : -2);
}