blob: 444183a2b1d3493fa5f3fffcf117f56afb389728 (
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
|
#include <stdint.h>
#include "ardour/interpolation.h"
using namespace ARDOUR;
Interpolation::Interpolation() : _speed (1.0L), state (0)
{
}
Interpolation::~Interpolation()
{
state = src_delete (state);
}
void
Interpolation::set_speed (double new_speed)
{
_speed = new_speed;
src_set_ratio (state, 1.0/_speed);
}
void
Interpolation::reset_state ()
{
if (state) {
src_reset (state);
} else {
state = src_new (SRC_LINEAR, 1, &error);
}
}
void
Interpolation::add_channel_to (int input_buffer_size, int output_buffer_size)
{
SRC_DATA newdata;
/* Set up sample rate converter info. */
newdata.end_of_input = 0 ;
newdata.input_frames = input_buffer_size;
newdata.output_frames = output_buffer_size;
newdata.input_frames_used = 0 ;
newdata.output_frames_gen = 0 ;
newdata.src_ratio = 1.0/_speed;
data.push_back (newdata);
reset_state ();
}
void
Interpolation::remove_channel_from ()
{
data.pop_back ();
reset_state ();
}
nframes_t
Interpolation::interpolate (int channel, nframes_t nframes, Sample *input, Sample *output)
{
data[channel].data_in = input;
data[channel].data_out = output;
data[channel].input_frames = nframes * _speed;
data[channel].output_frames = nframes;
data[channel].src_ratio = 1.0/_speed;
if ((error = src_process (state, &data[channel]))) {
printf ("\nError : %s\n\n", src_strerror (error));
exit (1);
}
return data[channel].input_frames_used;
}
|
