as3_jpeg.c

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/*
 * This file is part of the OpenKinect Project. http://www.openkinect.org
 *
 * Copyright (c) 2010 individual OpenKinect contributors. See the CONTRIB file
 * for details.
 *
 * This code is licensed to you under the terms of the Apache License, version
 * 2.0, or, at your option, the terms of the GNU General Public License,
 * version 2.0. See the APACHE20 and GPL2 files for the text of the licenses,
 * or the following URLs:
 * http://www.apache.org/licenses/LICENSE-2.0
 * http://www.gnu.org/licenses/gpl-2.0.txt
 *
 * If you redistribute this file in source form, modified or unmodified, you
 * may:
 *   1) Leave this header intact and distribute it under the same terms,
 *      accompanying it with the APACHE20 and GPL20 files, or
 *   2) Delete the Apache 2.0 clause and accompany it with the GPL2 file, or
 *   3) Delete the GPL v2 clause and accompany it with the APACHE20 file
 * In all cases you must keep the copyright notice intact and include a copy
 * of the CONTRIB file.
 *
 * Binary distributions must follow the binary distribution requirements of
 * either License.
 */

#include "as3_jpeg.h"

/*
 * Compress RGB buffer in memory
 */
int RGB_2_JPEG(unsigned char *buffer, unsigned char **compressed, long unsigned int *new_len, int quality) {
        struct jpeg_compress_struct cinfo = {0};
        struct jpeg_error_mgr jerr;
        JSAMPROW row_ptr[1];
        int row_stride;

        *compressed = NULL;
        *new_len = 0;

        cinfo.err = jpeg_std_error(&jerr);
        jpeg_create_compress(&cinfo);
        jpeg_mem_dest(&cinfo, compressed, new_len);

        cinfo.image_width = 640;
        cinfo.image_height = 480;
        cinfo.input_components = 3;
        cinfo.in_color_space = JCS_RGB;

        jpeg_set_defaults(&cinfo);
        jpeg_set_quality(&cinfo, quality, TRUE);
        jpeg_start_compress(&cinfo, TRUE);
        row_stride = 640 * 3;

        while (cinfo.next_scanline < cinfo.image_height) {
                row_ptr[0] = &buffer[cinfo.next_scanline * row_stride];
                jpeg_write_scanlines(&cinfo, row_ptr, 1);
        }

        jpeg_finish_compress(&cinfo);
        jpeg_destroy_compress(&cinfo);

        return 1;
}