/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * RTVideoRec Realtime video recoder and encoder for Linux
 *
 * Copyright (C) 2004  Bent Bisballe
 * Copyright (C) 2004  B. Stultiens
 * Copyright (C) 2004  Koen Otter and Glenn van der Meyden
 *
 * 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
 */

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

//av_alloc_format_context
//av_destruct_packet_nofree

ImgEncoder::ImgEncoder()
{
  //////////////////// GLOBAL INIT
	av_register_all();

  //////////////////// DECODE INIT
  AVCodec *deccodec;
  
  // find the dvvideo decoder
  deccodec = avcodec_find_decoder(CODEC_ID_DVVIDEO);
  if (!deccodec) {
    fprintf(stderr, "codec not found\n");
    exit(1);
  }
  
  dcc= avcodec_alloc_context();
  
  // open it
  if (avcodec_open(dcc, deccodec) < 0) {
    fprintf(stderr, "could not open codec\n");
    exit(1);
  }
}

ImgEncoder::~ImgEncoder()
{
  // FIXME: free: deccodec and dcc
}

void ImgEncoder::encode(DVFrame *dvframe, 
                        char *filename, 
                        int quality)
{ 
  int ret;
  AVFrame *rawframe = avcodec_alloc_frame();

  ///////////////////////// DECODE
  uint8_t *ptr;
  int got_picture = 1;
  int len;

  ptr = (uint8_t *)dvframe->frame;
  len = sizeof(dvframe->frame);

  ret = avcodec_decode_video(dcc, rawframe, &got_picture, ptr, len);

  if(!ret) {
    printf("Decoder fuckup!\n");
    return;
  }
  
  // TODO: Do image convertion here!
  AVPicture pict;
  avpicture_alloc(&pict,PIX_FMT_RGB24, 720, 576);

  img_convert(&pict, PIX_FMT_RGB24, (AVPicture *)rawframe, 
              PIX_FMT_YUV420P, 720, 576);
  printf("converted\n");
  writeJPEGFile(filename, quality, (JSAMPLE*)(pict.data[0]), 720, 576);
  printf("written\n");

  avpicture_free(&pict);
  av_free(rawframe);
}
///////////////////////////////////////////////////////////////////////////////////////////

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);
  */
}