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
|
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <stdlib.h>
#include <sys/param.h>
#include "cras_audio_area.h"
#include "cras_audio_format.h"
#include "cras_mix.h"
struct cras_audio_area *cras_audio_area_create(int num_channels)
{
struct cras_audio_area *area;
size_t sz;
sz = sizeof(*area) + num_channels * sizeof(struct cras_channel_area);
area = calloc(1, sz);
area->num_channels = num_channels;
return area;
}
unsigned int cras_audio_area_copy(const struct cras_audio_area *dst,
unsigned int dst_offset,
const struct cras_audio_format *dst_fmt,
const struct cras_audio_area *src,
unsigned int src_offset,
float software_gain_scaler)
{
unsigned int src_idx, dst_idx;
unsigned int ncopy;
uint8_t *schan, *dchan;
ncopy = MIN(src->frames - src_offset, dst->frames - dst_offset);
/* TODO(dgreid) - this replaces a memcpy, it needs to be way faster. */
for (src_idx = 0; src_idx < src->num_channels; src_idx++) {
for (dst_idx = 0; dst_idx < dst->num_channels; dst_idx++) {
if (!(src->channels[src_idx].ch_set &
dst->channels[dst_idx].ch_set))
continue;
schan = src->channels[src_idx].buf +
src_offset * src->channels[src_idx].step_bytes;
dchan = dst->channels[dst_idx].buf +
dst_offset * dst->channels[dst_idx].step_bytes;
cras_mix_add_scale_stride(
dst_fmt->format, dchan, schan, ncopy,
dst->channels[dst_idx].step_bytes,
src->channels[src_idx].step_bytes,
software_gain_scaler);
}
}
return ncopy;
}
void cras_audio_area_destroy(struct cras_audio_area *area)
{
free(area);
}
void cras_audio_area_config_channels(struct cras_audio_area *area,
const struct cras_audio_format *fmt)
{
unsigned int i, ch;
/* For mono, config the channel type to match both front
* left and front right.
* TODO(hychao): add more mapping when we have like {FL, FC}
* for mono + kb mic.
*/
if ((fmt->num_channels == 1) &&
((fmt->channel_layout[CRAS_CH_FC] == 0) ||
(fmt->channel_layout[CRAS_CH_FL] == 0))) {
channel_area_set_channel(area->channels, CRAS_CH_FL);
channel_area_set_channel(area->channels, CRAS_CH_FR);
return;
}
for (i = 0; i < fmt->num_channels; i++) {
area->channels[i].ch_set = 0;
for (ch = 0; ch < CRAS_CH_MAX; ch++)
if (fmt->channel_layout[ch] == i)
channel_area_set_channel(&area->channels[i],
ch);
}
}
void cras_audio_area_config_buf_pointers(struct cras_audio_area *area,
const struct cras_audio_format *fmt,
uint8_t *base_buffer)
{
int i;
const int sample_size = snd_pcm_format_physical_width(fmt->format) / 8;
/* TODO(dgreid) - assuming interleaved audio here for now. */
for (i = 0; i < area->num_channels; i++) {
area->channels[i].step_bytes = cras_get_format_bytes(fmt);
area->channels[i].buf = base_buffer + i * sample_size;
}
}
|
