summaryrefslogtreecommitdiff
path: root/server/libfame_wrapper.cc
blob: a663df6cc32c0f9929f82f05ca3d6eebbbe579a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            libfame_wrapper.cc
 *
 *  Sat Jul  2 11:11:31 CEST 2005
 *  Copyright  2005 Bent Bisballe
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  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 <config.h>
#include "libfame_wrapper.h"

#include <errno.h>

#include "miav_config.h"
#include "frame.h"

LibFAMEWrapper::LibFAMEWrapper(Info *i)
{
  info = i;
  
  // FIXME: Hmmm... should this be detected somewhere?!
  int w = 720;
  int h = 576;

  // Initialize yuv structure.
  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]
  
  calc_bitrate = 0;
  frame_number = 0;

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

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

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

  // 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) {
    info->error("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.
  fame_par.coding = config->readString("frame_sequence")->c_str();

  // quality is a percentage, which controls compression versus quality.
  fame_par.quality = config->readInt("video_quality");

  // Bitrate
  fame_par.bitrate = config->readInt("video_bitrate") * 1000; // video bitrate in bytes pr second (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 = 1;//fame_par.height / 16;

  // frames_per_sequence is the maximum number of frames contained in a video 
  // sequence.
  fame_par.frames_per_sequence = 0xffffffff; // Unlimited length

  // 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 = 100; // Original shape

  // 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 = 0; // Adaptive search range

  // 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[] = "MIaV\0";
  fame_par.profile = profilename;              // profile name
  fame_par.total_frames = 0;        // total number of frames

  if(strcmp(config->readString("encoding_codec")->c_str(), "mpeg4") == 0) {

    info->info("Using mpeg4 compression.");
    fame_object_t *object;
    
    object = fame_get_object(fame_context, "profile/mpeg4/simple");
    if(object) fame_register(fame_context, "profile", object);

  } else if(strcmp(config->readString("encoding_codec")->c_str(), "mpeg1") == 0) {

    info->info("Using mpeg1 compression.");
    fame_object_t *object;
    
    object = fame_get_object(fame_context, "profile/mpeg1");
    if(object) fame_register(fame_context, "profile", object);

  } else if(strcmp(config->readString("encoding_codec")->c_str(), "mpeg1") == 0) {
  } else {
    info->info("Using default (mpeg1) compression.");
  }

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

LibFAMEWrapper::~LibFAMEWrapper()
{
  delete [] yuv.y;
  delete [] yuv.u;
  delete [] yuv.v;
}

Frame *LibFAMEWrapper::encode(Frame *dvframe)
{
  //  if(!f) return; // The file was not opened.

  // Decode DV Frame to YUV422
  int w = 720;
  int h = 576;

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

  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;
  }

  pixels[ 0 ] = picture; // We use this as the output buffer
  pitches[ 0 ] = w * 2;
 
  dv_decode_full_frame(dvdecoder, 
                       dvframe->data, 
                       e_dv_color_yuv,
                       pixels,
                       pitches);

  // Convert YUV422 to YUV420p
  int w2 = w / 2;
  uint8_t *y = yuv.y;
  uint8_t *cb = yuv.u;
  uint8_t *cr = yuv.v;
  uint8_t *p = picture;
 
  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++;
    }
  }

  // Allocate a new frame for the output
  Frame *output = new Frame(NULL, FAME_BUFFER_SIZE);

  // Init frame params
  dv_get_timestamp(dvdecoder, output->timecode); // Set timecode
  output->size = 0;                              // Init size (incremented as we read)
  unsigned char* pt = output->data;              // Set pointer to start of data buffer

  // Encode YUV frame and write it to disk.
  fame_start_frame(fame_context, &yuv, 0);
  int written;
  
  while((written = fame_encode_slice(fame_context))) {
    memcpy(pt, fame_buffer, written);
    pt += written;
    output->size += written;
  }

  //  fame_frame_statistics_t stats;

  //  fame_end_frame(fame_context, &stats);
  /*
  info->info("frame_number: %d, coding: %c, target_bits: %d, actual_bits: %d, spatial_activity: %d, quant_scale: %f",
             stats.frame_number,
             stats.coding,
             stats.target_bits,
             stats.actual_bits,
             stats.spatial_activity,
             stats.quant_scale);
  */
  /*
    fame_frame_statistics_t_ {
       unsigned int frame_number;
       char coding;
       signed int target_bits;
       unsigned int actual_bits;
       unsigned int spatial_activity;
       float quant_scale;
    }
  */
  frame_number++;
  calc_bitrate += output->size; //stats.actual_bits;
  output->bitrate = (unsigned int)((double)calc_bitrate / (double)frame_number) * 25;

  return output;
}