path: root/src/mov_encoder.cc

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            mov_encoder.cc
 *
 *  Sat Feb 19 14:13:19 CET 2005
 *  Copyright  2005 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 1.17  2005/05/16 10:45:10  deva
 * Added new entries to fame parameter struct (bitrate omongst other things)
 *
 * Revision 1.16  2005/05/09 19:54:15  deva
 * *** empty log message ***
 *
 * Revision 1.15  2005/05/09 16:40:20  deva
 * Added optimize yuv conversion code
 *
 * Revision 1.14  2005/05/07 10:56:18  deva
 * Changed print outs
 *
 * Revision 1.13  2005/05/07 10:25:34  deva
 * Removed ffmpeg code from img_encoder and corrected decoding errors in mov_encoder
 *
 * Revision 1.12  2005/05/05 20:41:38  deva
 * Removed the last pieces of ffmpeg... replaced it with libfame...
 * Not quite working yet, but all the major code is in place!
 *
 * Revision 1.11  2005/05/03 17:12:53  deva
 * Fixed a bug (forgot to set the frametime).
 *
 * Revision 1.10  2005/05/03 08:31:59  deva
 * Removed the error object, and replaced it with a more generic info object.
 *
 * Revision 1.9  2005/05/02 10:59:44  deva
 * Reverted to mpg file format (accidentally used avi with mpeg2)
 *
 * Revision 1.8  2005/05/01 09:56:26  deva
 * Added Id and Log tags to all files
 */

#include "mov_encoder.h"

#include <errno.h>

#include "debug.h"
//av_alloc_format_context
//av_destruct_packet_nofree

MovEncoder::MovEncoder(const char *filename)
{
  // FIXME: Hmmm... should this be detected somewhere?!
  static int w = 720;
  static int h = 576;

  // Initialize yuv strucutre.
  yuv.w = w;
  yuv.h = h;
  yuv.p = w;
  yuv.y = new unsigned char [w*h * 2];
  yuv.u = new unsigned char [w*h];// [w*h/4]
  yuv.v = new unsigned char [w*h];// [w*h/4]

  ////////////LIBDV STUFF///////////////
  
  dvdecoder = NULL; // Initialize in encode method

  /////////LIBFAME STUFF///////////

  // Allocate the output buffer.
  fame_buffer = new unsigned char [FAME_BUFFER_SIZE];

  // Open output file
  f=fopen(filename, "wb");
  if(!f) {
    fprintf(stderr, "Failed to open output file [%s] due to teh following error: %s", filename, strerror(errno));
    return;
  }

  // Open a new session of the fame library.
  // (If initialization was successful, it returns a non-null context which 
  // can then be used for subsequent library calls.)
  fame_context = fame_open();
  if(!fame_context) {
    fprintf(stderr, "Unable to open FAME context, due to the following error: %s", strerror(errno));
    return;
  }

  /*
  typedef struct _fame_parameters_ {
    int width;                        // width of the video sequence
    int height;                       // height of the video sequence
    char const *coding;               // coding sequence
    int quality;                      // video quality
    int slices_per_frame;             // number of slices per frame
    unsigned int frames_per_sequence; // number of frames per sequence
    int frame_rate_num;               // numerator of frames per second
    int frame_rate_den;               // denominator of frames per second
    unsigned int shape_quality;       // binary shape quality
    unsigned int search_range;        // motion estimation search range
    unsigned char verbose;            // verbosity
  } fame_parameters_t;
  */
  // width and height specify the size of each frames of the video sequence. 
  // Both must be multiple of 16. width and height must be less than 4096x4096
  fame_par.width = 720;
  fame_par.height = 576;

  // coding is a string of I, P or B characters representing the sequence of 
  // frames the encoder must produce. I frames are intra-coded frames (similar 
  // to JPEG), whereas P and B frames are motion compressed, respectively 
  // predicted from past reference (I or P) frame, or bidirectionally predicted 
  // from past and future reference frame.
  static const char coding[] = "IPPPP\0";
  fame_par.coding = coding;

  // quality is a percentage, which controls compression versus quality.
  fame_par.quality = 100; // FIXME: This should be in config file!

  /////////////////////////////
  fame_par.bitrate = 0;                      /* video bitrate (0=VBR)*/

  // slices_per_frame is the number of frame slices per frame. More slices provide 
  // better error recovery. There must be at least one slice per frame, and at most 
  // height / 16
  fame_par.slices_per_frame = fame_par.height / 16;

  // frames_per_sequence is the maximum number of frames contained in a video 
  // sequence.
  fame_par.frames_per_sequence = 1024;//25 * 60 * 60 * 2; // 25 fps in two hours.

  // frame_rate_num/frame_rate_den specify the number of frames per second for 
  // playback.
  fame_par.frame_rate_num = 25; // 25 / 1 fps = 25 fps
  fame_par.frame_rate_den = 1;

  // shape_quality is percentage determing the average binary shape accuracy in 
  // video with arbitrary shape.
  fame_par.shape_quality = 1;

  // search_range specifies the motion estimation search range in pixel unit. 
  // Small search ranges work best with slow motion videos, whereas larger search 
  // ranges are rather for fast motion videos.
  fame_par.search_range = 10; // FIXME: No idea what this should be!?

  // verbose when set to 1 outputs information on copyright, modules used and 
  // current frame on standard error.
  fame_par.verbose = 0;

  static const char profilename[] = "My Profile\0";
  fame_par.profile = profilename;              /* profile name */
  fame_par.total_frames = 0;        /* total number of frames */


  fame_init(fame_context, &fame_par, fame_buffer, FAME_BUFFER_SIZE);
}

MovEncoder::~MovEncoder()
{
  if(f) { // The file was opened.
    int written = fame_close(fame_context);
    fwrite(fame_buffer, written, 1, f);
    fclose(f);
  }
  delete [] fame_buffer;
  delete [] yuv.y;
  delete [] yuv.u;
  delete [] yuv.v;
}

void MovEncoder::encode(Frame *dvframe)
{
  encode_video(dvframe);
  encode_audio(dvframe);
}

//#define RGB

#ifdef RGB
#define _CLAMP(x) (unsigned char) ((x)<0?0:(((x)>255)?255:(x)))

inline void rgb_to_yuv(unsigned char *rgb, unsigned char &y, unsigned char &u, unsigned char &v)
{
  y = _CLAMP( 0.257 * rgb[0] + 0.504 * rgb[1] + 0.098 * rgb[2] + 16);
  v = _CLAMP( 0.439 * rgb[0] - 0.368 * rgb[1] - 0.071 * rgb[2] + 128);
  u = _CLAMP(-0.148 * rgb[0] - 0.291 * rgb[1] + 0.439 * rgb[2] + 128);
}
#endif

void MovEncoder::encode_video(Frame *dvframe)
{
  if(!f) return; // The file was not opened.
  
  // Decode DV Frame to YUV
  int w = 720;
  int h = 576;

  unsigned char *pixels[3];
  int pitches[3];

#ifdef RGB
  pixels[ 0 ] = rgb;
  pixels[ 1 ] = NULL;
  pixels[ 2 ] = NULL;

  pitches[ 0 ] = 720 * 3;
  pitches[ 1 ] = 0;
  pitches[ 2 ] = 0;
#endif

  if(!dvdecoder) {
    dvdecoder = dv_decoder_new(FALSE/*this value is unused*/, FALSE, FALSE);
    dvdecoder->quality = DV_QUALITY_BEST;

    dv_parse_header(dvdecoder, dvframe->data);
    //dv_parse_packs(decoder, frame->data); // Not needed anyway!
    
    dvdecoder->system = e_dv_system_625_50;  // PAL lines, PAL framerate
    dvdecoder->sampling = e_dv_sample_422;  // 4 bytes y, 2 bytes u, 2 bytes v
    dvdecoder->std = e_dv_std_iec_61834;
    dvdecoder->num_dif_seqs = 12;
  }

#ifdef RGB
  dv_decode_full_frame(dvdecoder, 
                       dvframe->data, 
                       e_dv_color_rgb,
                       pixels,
                       pitches);

  // cvt rgb to yuv
  for (int y=0; y<h; y+=2) {
    for (int x=0; x<w; x+=2) {
      unsigned char vy[4],vu[4],vv[4];
      
      rgb_to_yuv(rgb + 3*((y+0)*w + (x+0)), vy[0],vu[0],vv[0]);
      rgb_to_yuv(rgb + 3*((y+0)*w + (x+1)), vy[1],vu[1],vv[1]);
      rgb_to_yuv(rgb + 3*((y+1)*w + (x+0)), vy[2],vu[2],vv[2]);
      rgb_to_yuv(rgb + 3*((y+1)*w + (x+1)), vy[3],vu[3],vv[3]);
      // Y
      yuv.y[(y+0)*w+(x+0)] = vy[0];
      yuv.y[(y+0)*w+(x+1)] = vy[1];
      yuv.y[(y+1)*w+(x+0)] = vy[2];
      yuv.y[(y+1)*w+(x+1)] = vy[3];
      // Cb
      yuv.u[y*w/4+x/2] = (vu[0]+vu[1]+vu[2]+vu[3])/4;
      // Cr
      yuv.v[y*w/4+x/2] = (vv[0]+vv[1]+vv[2]+vv[3])/4;
    }
  }
#else
  pixels[ 0 ] = rgb; // We use this as the output buffer
  pitches[ 0 ] = w * 2;
 
  dv_decode_full_frame(dvdecoder, 
                       dvframe->data, 
                       e_dv_color_yuv,
                       pixels,
                       pitches);

  int w2 = w / 2;
  uint8_t *y = yuv.y;
  uint8_t *cb = yuv.u;
  uint8_t *cr = yuv.v;
  uint8_t *p = rgb;
 
  for ( int i = 0; i < h; i += 2 ) {
    // process two scanlines (one from each field, interleaved)
    for ( int j = 0; j < w2; j++ ) {
      // packed YUV 422 is: Y[i] U[i] Y[i+1] V[i]
      *( y++ ) = *( p++ );
      *( cb++ ) = *( p++ );
      *( y++ ) = *( p++ );
      *( cr++ ) = *( p++ );
    }

    // process next two scanlines (one from each field, interleaved)
    for ( int j = 0; j < w2; j++ ) {
      // skip every second line for U and V
      *( y++ ) = *( p++ );
      p++;
      *( y++ ) = *( p++ );
      p++;
    }
  }
#endif

  // Encode YUV frame and write it to disk.
  fame_start_frame(fame_context, &yuv, 0);
  int written;
  while((written = fame_encode_slice(fame_context))) {
    fwrite(fame_buffer, written, 1, f);
  }
  fame_end_frame(fame_context,0);
}

void MovEncoder::encode_audio(Frame *dvframe)
{
  // TODO: Do some audio stuff here sometime!
}