/* -*- 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.
 */
#include "img_encoder.h"

#include <stdio.h>
#include <libdv/dv.h>
#include <libdv/dv_types.h>
extern "C" {
#include <jpeglib.h>
}

#include <hugin.hpp>

#include "jpeg_mem_dest.h"
#include "miav_config.h"

ImgEncoder::ImgEncoder(const char* cpr)
{
  // Create path and filename
  char fname[256];
  string *server_root;
  char birthmonth[3];
  char date[32];
  char encrypted_cpr[32];

  // Get server root
  server_root = config->readString("server_image_root");

  // Copy the bytes representing the birth month from the cpr
  // [dd][mm][yy]-[nn][nn]
  strncpy(birthmonth, &cpr[2], 2);
  birthmonth[2] = 0;

  // Create date (today) in [yyyy][mm][dd]
  struct tm *ltime;
  time_t t = time(NULL);
  ltime = localtime(&t);
  sprintf(date, "%.4d%.2d%.2d", 
          ltime->tm_year + 1900, 
          ltime->tm_mon, 
          ltime->tm_mday);

  // Create 'encrypted' cpr, reverse numbers, skip month, and subtract from 9
  // [d1][d2][m1][m2][y1][y2]-[n1][n2][n3][n4]
  // =>
  // [9-n4][9-n3][9-n2][9-n1][9-y2][9-y1][9-d2][9-d1]
  memset(encrypted_cpr, 0, sizeof(encrypted_cpr));
  int p = strlen(cpr) - 1;
  int cnt = 0;
  while(p) {
    encrypted_cpr[cnt] = cpr[p];
    p--;
    if(p == 2) p--;
    if(cpr[p] == '-' || p == 3) p--;
    cnt++;
  }

  sprintf(fname, "%s/%s/%s/%s-%s-", server_root->c_str(), birthmonth, encrypted_cpr, cpr, date);

  file = new File(fname, "jpg");
}


ImgEncoder::~ImgEncoder()
{
  delete file;
}


void ImgEncoder::encode(Frame *dvframe, int quality)
{ 
  unsigned char rgb[720*576*4];

  getRGB(dvframe, rgb);
  writeJPEGFile(quality, rgb, 720, 576);
}


void ImgEncoder::writeJPEGFile(int quality, unsigned char *rgb, int image_width, int image_height)
{
  JSAMPLE *image_buffer = (JSAMPLE*)rgb;

  size_t buffersize = (image_width * image_height * 3) + JPEG_HEADER_PAD;
  char *jpeg_output_buffer = new char [buffersize];
  struct jpeg_compress_struct cinfo;
  struct jpeg_error_mgr jerr;
    
  JSAMPROW row_pointer[1];      // pointer to JSAMPLE row[s] 
  int row_stride;               // physical row width in image buffer 
    
  // Allocate and initialize JPEG compression object 
  cinfo.err = jpeg_std_error(&jerr);
  jpeg_create_compress(&cinfo);
    
  // Specify data destination (see jpeg_mem_dest)
  jpeg_mem_dest(&cinfo, jpeg_output_buffer, &buffersize);
    
  // Set compression parameters
  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 
  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
    
  // Start compressor 
  jpeg_start_compress(&cinfo, TRUE);
    
  // 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);
  }
    
  // Finish compression 
  jpeg_finish_compress(&cinfo);

  // Release JPEG compression object 
  jpeg_destroy_compress(&cinfo);

  DEBUG(jpeg, "JPEG buffersize: %d", (int)buffersize);
  file->Write(jpeg_output_buffer, buffersize);
  delete jpeg_output_buffer;
}

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);
}