FFmpeg
dvaudio.h
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVCODEC_DVAUDIO_H
20 #define AVCODEC_DVAUDIO_H
21 
22 #include <stdint.h>
23 
24 static inline int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
25 {
26  int samples = buffer[0] & 0x3f; /* samples in this frame - min samples */
27 
28  switch ((buffer[3] >> 3) & 0x07) {
29  case 0:
30  return samples + (dsf ? 1896 : 1580);
31  case 1:
32  return samples + (dsf ? 1742 : 1452);
33  case 2:
34  default:
35  return samples + (dsf ? 1264 : 1053);
36  }
37 }
38 
39 #endif /* AVCODEC_DVAUDIO_H */
buffer
the frame and frame reference mechanism is intended to as much as expensive copies of that data while still allowing the filters to produce correct results The data is stored in buffers represented by AVFrame structures Several references can point to the same frame buffer
Definition: filter_design.txt:49
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:8
dv_get_audio_sample_count
static int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
Definition: dvaudio.h:24