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
|
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "alsa_device_proxy"
/*#define LOG_NDEBUG 0*/
/*#define LOG_PCM_PARAMS 0*/
#include <log/log.h>
#include <errno.h>
#include "alsa_device_proxy.h"
#include "audio_logging.h"
#define DEFAULT_PERIOD_SIZE 1024
#define DEFAULT_PERIOD_COUNT 2
void proxy_prepare(alsa_device_proxy * proxy, alsa_device_profile* profile,
struct pcm_config * config)
{
ALOGV("proxy_prepare(c:%d, d:%d)", profile->card, profile->device);
proxy->profile = profile;
#ifdef LOG_PCM_PARAMS
log_pcm_config(config, "proxy_setup()");
#endif
proxy->alsa_config.format =
config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)
? config->format : profile->default_config.format;
proxy->alsa_config.rate =
config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)
? config->rate : profile->default_config.rate;
proxy->alsa_config.channels =
config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)
? config->channels : profile->default_config.channels;
proxy->alsa_config.period_count = profile->default_config.period_count;
proxy->alsa_config.period_size =
profile_get_period_size(proxy->profile, proxy->alsa_config.rate);
// Hack for USB accessory audio.
// Here we set the correct value for period_count if tinyalsa fails to get it from the
// f_audio_source driver.
if (proxy->alsa_config.period_count == 0) {
proxy->alsa_config.period_count = 4;
}
proxy->pcm = NULL;
}
int proxy_open(alsa_device_proxy * proxy)
{
alsa_device_profile* profile = proxy->profile;
ALOGV("proxy_open(card:%d device:%d %s)", profile->card, profile->device,
profile->direction == PCM_OUT ? "PCM_OUT" : "PCM_IN");
if (profile->card < 0 || profile->device < 0) {
return -EINVAL;
}
proxy->pcm = pcm_open(profile->card, profile->device, profile->direction, &proxy->alsa_config);
if (proxy->pcm == NULL) {
return -ENOMEM;
}
if (!pcm_is_ready(proxy->pcm)) {
ALOGE(" proxy_open() pcm_open() failed: %s", pcm_get_error(proxy->pcm));
#if defined(LOG_PCM_PARAMS)
log_pcm_config(&proxy->alsa_config, "config");
#endif
pcm_close(proxy->pcm);
proxy->pcm = NULL;
return -ENOMEM;
}
return 0;
}
void proxy_close(alsa_device_proxy * proxy)
{
ALOGV("proxy_close() [pcm:%p]", proxy->pcm);
if (proxy->pcm != NULL) {
pcm_close(proxy->pcm);
proxy->pcm = NULL;
}
}
/*
* Sample Rate
*/
unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy)
{
return proxy->alsa_config.rate;
}
/*
* Format
*/
enum pcm_format proxy_get_format(const alsa_device_proxy * proxy)
{
return proxy->alsa_config.format;
}
/*
* Channel Count
*/
unsigned proxy_get_channel_count(const alsa_device_proxy * proxy)
{
return proxy->alsa_config.channels;
}
/*
* Other
*/
unsigned int proxy_get_period_size(const alsa_device_proxy * proxy)
{
return proxy->alsa_config.period_size;
}
unsigned int proxy_get_period_count(const alsa_device_proxy * proxy)
{
return proxy->alsa_config.period_count;
}
unsigned proxy_get_latency(const alsa_device_proxy * proxy)
{
return (proxy_get_period_size(proxy) * proxy_get_period_count(proxy) * 1000)
/ proxy_get_sample_rate(proxy);
}
/*
* I/O
*/
int proxy_write(const alsa_device_proxy * proxy, const void *data, unsigned int count)
{
return pcm_write(proxy->pcm, data, count);
}
int proxy_read(const alsa_device_proxy * proxy, void *data, unsigned int count)
{
return pcm_read(proxy->pcm, data, count);
}
|
