/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            img_encoder.cc
 *
 *  Mon Nov 15 19:45:07 CET 2004
 *  Copyright  2004 Bent Bisballe
 *  deva@aasimon.org
 ****************************************************************************/

/*
 * Originally from:
 * RTVideoRec Realtime video recoder and encoder for Linux
 *
 * Copyright (C) 2004  B. Stultiens
 * Copyright (C) 2004  Koen Otter and Glenn van der Meyden
 */

/*
 *    This file is part of MIaV.
 *
 *    MIaV 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.
 *
 *    MIaV 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 MIaV; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */

/*
 * $Id$
 */

/*
 * $Log$
 * Revision 1.9  2005/05/26 12:48:36  deva
 * *** empty log message ***
 *
 * Revision 1.8  2005/05/07 10:25:34  deva
 *
 * Removed ffmpeg code from img_encoder and corrected decoding errors in mov_encoder
 *
 * Revision 1.7  2005/05/03 08:31:59  deva
 * Removed the error object, and replaced it with a more generic info object.
 *
 * Revision 1.6  2005/05/01 09:56:26  deva
 * Added Id and Log tags to all files
 */

#include "img_encoder.h"
#include <stdio.h>

#include "debug.h"

// Use libdv
#include <libdv/dv.h>
#include <libdv/dv_types.h>

ImgEncoder::ImgEncoder()
{
}

ImgEncoder::~ImgEncoder()
{
}

void ImgEncoder::encode(Frame *dvframe, 
                        char *filename, 
                        int quality)
{ 
  // Append suffix..
  char fname[256];
  sprintf(fname, "%s.jpg", filename);
  
  unsigned char rgb[720*576*4];

  getRGB(dvframe, rgb);
  writeJPEGFile(fname, quality, (JSAMPLE*)rgb, 720, 576);
}
///////////////////////////////////////////////////////////////////////////////////////////

void ImgEncoder::writeJPEGFile(char *filename, 
                               int quality,
                               JSAMPLE * image_buffer, // Points to large array of R,G,B-order data 
                               int image_width,        // Number of columns in image 
                               int image_height        // Number of rows in image 
)
{
    struct jpeg_compress_struct cinfo;
    struct jpeg_error_mgr jerr;
    
    FILE * outfile;               // target file
    JSAMPROW row_pointer[1];      // pointer to JSAMPLE row[s] 
    int row_stride;               // physical row width in image buffer 
    
    // Step 1: allocate and initialize JPEG compression object 
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_compress(&cinfo);
    
    // Step 2: specify data destination (eg, a file) 
    if ((outfile = fopen(filename, "wb")) == NULL) {
      fprintf(stderr, "can't open %s\n", filename);
      exit(1);
    }
    jpeg_stdio_dest(&cinfo, outfile);
    
    // Step 3: set parameters for compression 
    cinfo.image_width = image_width;      // image width and height, in pixels 
    cinfo.image_height = image_height;
    cinfo.input_components = 3;           // # of color components per pixel 
    
    //typedef enum {
    //        JCS_UNKNOWN,            // error/unspecified
    //        JCS_GRAYSCALE,          // monochrome
    //        JCS_RGB,                // red/green/blue
    //        JCS_YCbCr,              // Y/Cb/Cr (also known as YUV)
    //        JCS_CMYK,               // C/M/Y/K
    //        JCS_YCCK                // Y/Cb/Cr/K
    //} J_COLOR_SPACE;
    
    cinfo.in_color_space = JCS_RGB;       // colorspace of input image 
    
    jpeg_set_defaults(&cinfo);
    
    jpeg_set_quality(&cinfo, quality, TRUE); // limit to baseline-JPEG values
    
    // Step 4: Start compressor 
    jpeg_start_compress(&cinfo, TRUE);
    
    // Step 5: while (scan lines remain to be written) 
    row_stride = image_width * 3; // JSAMPLEs per row in image_buffer 
    
    while (cinfo.next_scanline < cinfo.image_height) {
      row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
      (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
    }
    
    // Step 6: Finish compression 
    jpeg_finish_compress(&cinfo);
    fclose(outfile);
    
    // Step 7: release JPEG compression object 
    jpeg_destroy_compress(&cinfo);
}

void ImgEncoder::getRGB(Frame *frame, unsigned char *rgb)
{
  unsigned char *pixels[3];
  int pitches[3];

  pixels[ 0 ] = rgb;
  pixels[ 1 ] = NULL;
  pixels[ 2 ] = NULL;

  pitches[ 0 ] = 720 * 3;
  pitches[ 1 ] = 0;
  pitches[ 2 ] = 0;
  
	dv_decoder_t *decoder = dv_decoder_new(FALSE/*this value is unused*/, FALSE, FALSE);
  decoder->quality = DV_QUALITY_BEST;

  dv_parse_header(decoder, frame->data);
  
  decoder->system = e_dv_system_625_50;  // PAL lines, PAL framerate
  decoder->sampling = e_dv_sample_422;  // 4 bytes y, 2 bytes u, 2 bytes v
  decoder->std = e_dv_std_iec_61834;
  decoder->num_dif_seqs = 12;
  
  // libdv img decode to rgb
  dv_decode_full_frame(decoder,
                       frame->data,
                       e_dv_color_rgb,
                       pixels,
                       pitches);
  
  dv_decoder_free(decoder);
}