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
160
161
162
163
164
|
// Copyright (c) 2011 The Chromium 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 "media/audio/linux/alsa_wrapper.h"
#include <alsa/asoundlib.h>
AlsaWrapper::AlsaWrapper() {
}
AlsaWrapper::~AlsaWrapper() {
}
int AlsaWrapper::PcmOpen(snd_pcm_t** handle, const char* name,
snd_pcm_stream_t stream, int mode) {
return snd_pcm_open(handle, name, stream, mode);
}
int AlsaWrapper::DeviceNameHint(int card, const char* iface, void*** hints) {
return snd_device_name_hint(card, iface, hints);
}
char* AlsaWrapper::DeviceNameGetHint(const void* hint, const char* id) {
return snd_device_name_get_hint(hint, id);
}
int AlsaWrapper::DeviceNameFreeHint(void** hints) {
return snd_device_name_free_hint(hints);
}
int AlsaWrapper::CardNext(int* rcard) {
return snd_card_next(rcard);
}
int AlsaWrapper::PcmClose(snd_pcm_t* handle) {
return snd_pcm_close(handle);
}
int AlsaWrapper::PcmPrepare(snd_pcm_t* handle) {
return snd_pcm_prepare(handle);
}
int AlsaWrapper::PcmDrop(snd_pcm_t* handle) {
return snd_pcm_drop(handle);
}
int AlsaWrapper::PcmDelay(snd_pcm_t* handle, snd_pcm_sframes_t* delay) {
return snd_pcm_delay(handle, delay);
}
snd_pcm_sframes_t AlsaWrapper::PcmWritei(snd_pcm_t* handle,
const void* buffer,
snd_pcm_uframes_t size) {
return snd_pcm_writei(handle, buffer, size);
}
snd_pcm_sframes_t AlsaWrapper::PcmReadi(snd_pcm_t* handle,
void* buffer,
snd_pcm_uframes_t size) {
return snd_pcm_readi(handle, buffer, size);
}
int AlsaWrapper::PcmRecover(snd_pcm_t* handle, int err, int silent) {
return snd_pcm_recover(handle, err, silent);
}
const char* AlsaWrapper::PcmName(snd_pcm_t* handle) {
return snd_pcm_name(handle);
}
int AlsaWrapper::ConfigureHwParams(snd_pcm_t* handle,
snd_pcm_hw_params_t* hw_params,
snd_pcm_format_t format,
snd_pcm_access_t access,
unsigned int channels,
unsigned int rate,
int soft_resample,
unsigned int latency) {
int err = 0;
if ((err = snd_pcm_hw_params_any(handle, hw_params)) < 0)
return err;
if ((err = snd_pcm_hw_params_set_rate_resample(handle, hw_params,
soft_resample)) < 0) {
return err;
}
if ((err = snd_pcm_hw_params_set_format(handle, hw_params, format)) < 0)
return err;
int dir = 0;
unsigned new_rate = rate;
if ((err = snd_pcm_hw_params_set_rate_near(handle, hw_params,
&new_rate, &dir)) < 0) {
return err;
}
if ((err = snd_pcm_hw_params_set_access(handle, hw_params, access)) < 0)
return err;
if ((err = snd_pcm_hw_params_set_channels(handle, hw_params, channels)) < 0)
return err;
unsigned buffer_time = latency;
if (buffer_time == 0) {
if ((err = snd_pcm_hw_params_get_buffer_time_max(hw_params,
&buffer_time, 0)) < 0) {
return err;
}
if (buffer_time > 500000)
buffer_time = 500000;
}
unsigned period_time = buffer_time / 4;
if ((err = snd_pcm_hw_params_set_period_time_near(handle, hw_params,
&period_time, 0)) < 0) {
return err;
}
err = snd_pcm_hw_params_set_buffer_time_near(handle, hw_params,
&buffer_time, 0);
return err;
}
int AlsaWrapper::PcmSetParams(snd_pcm_t* handle, snd_pcm_format_t format,
snd_pcm_access_t access, unsigned int channels,
unsigned int rate, int soft_resample,
unsigned int latency) {
int err = 0;
snd_pcm_hw_params_t *hw_params;
if ((err = snd_pcm_hw_params_malloc(&hw_params)) < 0)
return err;
if ((err = ConfigureHwParams(handle, hw_params, format, access, channels,
rate, soft_resample, latency)) >= 0) {
err = snd_pcm_hw_params(handle, hw_params);
}
snd_pcm_hw_params_free(hw_params);
return err;
}
int AlsaWrapper::PcmGetParams(snd_pcm_t* handle, snd_pcm_uframes_t* buffer_size,
snd_pcm_uframes_t* period_size) {
return snd_pcm_get_params(handle, buffer_size, period_size);
}
snd_pcm_sframes_t AlsaWrapper::PcmAvailUpdate(snd_pcm_t* handle) {
return snd_pcm_avail_update(handle);
}
snd_pcm_state_t AlsaWrapper::PcmState(snd_pcm_t* handle) {
return snd_pcm_state(handle);
}
const char* AlsaWrapper::StrError(int errnum) {
return snd_strerror(errnum);
}
int AlsaWrapper::PcmStart(snd_pcm_t* handle) {
return snd_pcm_start(handle);
}
|
