blob: 3a9953d70a6c237d8fa0f36ec383fd7856f66a34 (
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
|
/*
* Purpose: Local input buffer to application export routine for vmix (int)
*/
/*
*
* This file is part of Open Sound System.
*
* Copyright (C) 4Front Technologies 1996-2008.
*
* This this source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
*/
vmix_mixer_t *mixer = portc->mixer;
vmix_engine_t *eng = &mixer->record_engine;
dmap_t *dmap = audio_engines[portc->audio_dev]->dmap_in;
int frame_size;
int outptr, outmax;
int used_channels;
int i, ch;
/*
* Initial setup
*/
frame_size = sizeof (*outp);
outmax = dmap->bytes_in_use / frame_size;
outptr = portc->rec_dma_pointer / frame_size;
outp = (BUFFER_TYPE) dmap->dmabuf;
used_channels = portc->channels;
if (used_channels > eng->channels)
used_channels = eng->channels;
/* ignored_channels = portc->channels - used_channels; */
/*
* Do the mixing
*/
for (ch = 0; ch < used_channels; ch++)
{
int op = outptr + ch;
int *chbuf = eng->chbufs[ch+portc->rec_choffs];
for (i = 0; i < nsamples; i++)
{
int tmp;
tmp = *chbuf++;
/*
* Convert the sample to right endianess.
*/
outp[op] = VMIX_BYTESWAP (INT_EXPORT(tmp));
op = (op + portc->channels) % outmax;
}
}
/*
* Finally save the state variables
*/
portc->rec_dma_pointer =
(portc->rec_dma_pointer +
nsamples * frame_size * portc->channels) % dmap->bytes_in_use;
|
