summaryrefslogtreecommitdiff
path: root/src/liblame_wrapper.cc
blob: 87b2f11ac65f40d0b4493179c0aca5db7a0bb6fe (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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            liblame_wrapper.cc
 *
 *  Sat Jul  2 11:11:34 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 "liblame_wrapper.h"
#include "miav_config.h"

LibLAMEWrapper::LibLAMEWrapper(Info *i)
{
  info = i;

  // Init library.
  if( (gfp = lame_init()) == NULL) {
    info->error("LAME initialization failed (due to malloc failure!)");
    return;
  }

	lame_set_in_samplerate(gfp, INPUT_SAMPLE_RATE);
	lame_set_out_samplerate(gfp, OUTPUT_SAMPLE_RATE);

 	lame_set_num_channels(gfp, CHANNELS);
  //  lame_set_num_samples(gfp, 1152);
  //  lame_set_num_samples(gfp, SAMPLES);
  //  lame_set_num_samples(gfp, 0);

	lame_set_quality(gfp, config->readInt("mp3_quality"));
	lame_set_mode(gfp, STEREO);
	lame_set_brate(gfp, config->readInt("mp3_bitrate"));

  lame_set_strict_ISO(gfp, 1);

  // 1 = write a Xing VBR header frame.
  lame_set_bWriteVbrTag(gfp, 0);

  // Types of VBR.  default = vbr_off = CBR
  //  lame_set_VBR(gfp, vbr_rh);

  // VBR quality level.  0=highest  9=lowest
  //  lame_set_VBR_q(gfp, 6);
  
  lame_set_copyright(gfp, 0);       // is there a copyright on the encoded data?
  lame_set_original(gfp, 1);        // is the encoded data on the original media?
  lame_set_error_protection(gfp, 0);// add 2 byte CRC protection to each frame?
  lame_set_padding_type(gfp, PAD_NO); // PAD_NO, PAD_ALL, PAD_ADJUST, PAD_MAX_INDICATOR 
                                    // 0 = do not pad frames
                                    // 1 = always pad frames
                                    // 2 = adjust padding to satisfy bit rate
  lame_set_extension(gfp, 0);       // private extension bit


	if (lame_init_params(gfp) < 0) {
    info->error("LAME parameter initialization failed.");
    return;
  }

  audio_buffer[0] = new int16_t[AUDIO_BUFFER_SIZE];
  audio_buffer[1] = new int16_t[AUDIO_BUFFER_SIZE];

  // And now for the dv decoder!
  decoder = NULL;

  calc_bitrate = 0;
  frame_number = 0;
}

LibLAMEWrapper::~LibLAMEWrapper()
{
  delete audio_buffer[0];
  delete audio_buffer[1];
}

Frame *LibLAMEWrapper::close(Frame *oldframe)
{
  Frame *frame = new Frame(NULL, oldframe->size + 7200);
  frame->number = oldframe->number;

  memcpy(frame->data, oldframe->data, oldframe->size);

  int flush;

  flush = lame_encode_finish(gfp, frame->data + oldframe->size, 7200);
     
  frame->size = oldframe->size + flush;

  calc_bitrate += flush;
  frame->bitrate = (unsigned int)((double)calc_bitrate / (double)(frame_number)) * 25;

  delete oldframe;

  return frame;
}

Frame *LibLAMEWrapper::encode(Frame *dvframe)
{

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

  /**
   * Decode audio using libdv
   */
  dv_decode_full_audio( decoder, dvframe->data, audio_buffer );

  /**
   * input pcm data, output (maybe) mp3 frames.
   * This routine handles all buffering, resampling and filtering for you.
   * 
   * The required mp3buf_size can be computed from num_samples, 
   * samplerate and encoding rate, but here is a worst case estimate:
   *
   * return code     number of bytes output in mp3buffer.  can be 0 
   *                 if return code = -1:  mp3buffer was too small
   *
   * mp3buf_size in bytes = 1.25*num_samples + 7200
   *
   * I think a tighter bound could be:  (mt, March 2000)
   * MPEG1:
   *    num_samples*(bitrate/8)/samplerate + 4*1152*(bitrate/8)/samplerate + 512
   * MPEG2:
   *    num_samples*(bitrate/8)/samplerate + 4*576*(bitrate/8)/samplerate + 256
   *
   * but test first if you use that!
   *
   * set mp3buf_size = 0 and LAME will not check if mp3buf_size is
   * large enough.
   *
   * NOTE:
   * if gfp->num_channels=2, but gfp->mode = 3 (mono), the L & R channels
   * will be averaged into the L channel before encoding only the L channel
   * This will overwrite the data in buffer_l[] and buffer_r[].
   * 
   */
  Frame* audio_frame = new Frame(NULL, (int)(1.25 * SAMPLES + 7200));

  const short int    *buffer_l = audio_buffer[0];   // PCM data for left channel
  const short int    *buffer_r = audio_buffer[1];   // PCM data for right channel
  const int           nsamples = SAMPLES;      // number of samples per channel
  unsigned char*      mp3buf = audio_frame->data;        // pointer to encoded MP3 stream
  const int           mp3buf_size = audio_frame->size;   // number of valid octets in this

  int val;
  val = lame_encode_buffer(gfp, buffer_l, buffer_r, nsamples, mp3buf, mp3buf_size);
  // val = lame_encode_mp3_frame(gfp, buffer_l, buffer_r, mp3buf, mp3buf_size);
  
  //  info->info("Framenr: %d", lame_get_frameNum(gfp));

  if(val < 0) {
    switch(val) {
    case -1:  // mp3buf was too small
      info->error("Lame encoding failed, mp3buf was too small.");
      break;
    case -2:  // malloc() problem
      info->error("Lame encoding failed, due to malloc() problem.");
      break;
    case -3:  // lame_init_params() not called
      info->error("Lame encoding failed, lame_init_params() not called.");
      break;
    case -4:  // psycho acoustic problems 
      info->error("Lame encoding failed, due to psycho acoustic problems.");
      break;
    default:
      info->error("Lame encoding failed, due to unknown error.");
      break;
    }
  }

  /**
   * OPTIONAL:
   * lame_encode_flush_nogap will flush the internal mp3 buffers and pad
   * the last frame with ancillary data so it is a complete mp3 frame.
   * 
   * 'mp3buf' should be at least 7200 bytes long
   * to hold all possible emitted data.
   *
   * After a call to this routine, the outputed mp3 data is complete, but
   * you may continue to encode new PCM samples and write future mp3 data
   * to a different file.  The two mp3 files will play back with no gaps
   * if they are concatenated together.
   *
   * This routine will NOT write id3v1 tags into the bitstream.
   *
   * return code = number of bytes output to mp3buf. Can be 0
   */
  
  int flush_sz = 0;

  /*
  flush_sz = lame_encode_flush_nogap(gfp,    // global context handle
                                     mp3buf + val, // pointer to encoded MP3 stream
                                     mp3buf_size - val);  // number of valid octets in this stream
  */

  info->info("VAL: %d  - FLUSH_SZ: %d - TOTAL: %d", val, flush_sz, (val + flush_sz));

  audio_frame->size = val + flush_sz;

  /*

  int bitrate_kbps[14];
  //  lame_bitrate_kbps(gfp, bitrate_kbps);
  lame_bitrate_hist(gfp, bitrate_kbps);
  // 32 40 48 56 64 80 96 112 128 160 192 224 256 320
  info->info("%d %d %d %d %d %d %d %d %d %d %d %d %d %d",
             bitrate_kbps[0],
             bitrate_kbps[1],
             bitrate_kbps[2],
             bitrate_kbps[3],
             bitrate_kbps[4],
             bitrate_kbps[5],
             bitrate_kbps[6],
             bitrate_kbps[7],
             bitrate_kbps[8],
             bitrate_kbps[9],
             bitrate_kbps[10],
             bitrate_kbps[11],
             bitrate_kbps[12],
             bitrate_kbps[13]);
  */
  //  while(frame_number != lame_get_frameNum(gfp)) {

  calc_bitrate += audio_frame->size;//lame_get_framesize(gfp);
  frame_number ++;//= 1;//lame_get_frameNum(gfp);

    //    info->info("lame_get_frameNum(gfp) %d ?= frame_number %d", lame_get_frameNum(gfp), frame_number);
    //  }

  // Bits pr. second
  // 25 * 7 frames pr.second (it seems!)
  audio_frame->bitrate = (unsigned int)((double)calc_bitrate / (double)(frame_number)) * 25;
  /*
  info->info("Audio size: %d, bitrate: %.4f", 
             audio_frame->bitrate, 
             (float)(config->readInt("mp3_bitrate") * 1000)/(float)(audio_frame->bitrate));
  */

  return audio_frame;
}