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
|
/*
* Copyright (C) 2018 "IoT.bzh"
* Author Fulup Ar Foll <fulup@iot.bzh>
*
* 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 _GNU_SOURCE // needed for vasprintf
#include "alsa-softmixer.h"
PUBLIC snd_pcm_t* AlsaCreateCapture(CtlSourceT *source, const char* sndDevPath, unsigned int deviceIdx, unsigned int subpcmNamex, unsigned int channelCount) {
char pcmName[32];
int error;
snd_pcm_t *pcmHandle;
snd_pcm_hw_params_t *pcmParams;
AFB_ApiNotice(source->api, "AlsaCreateCapture: start ");
// get card info from /dev/snd/xxx
snd_ctl_card_info_t *cardInfo = AlsaByPathInfo(source, sndDevPath);
if (!cardInfo) {
AFB_ApiError(source->api,"AlsaCreateCapture: fail to find sndcard by path= %s", sndDevPath);
goto OnErrorExit;
}
// extract useful info from cardInfo handle
int cardIdx = snd_ctl_card_info_get_card(cardInfo);
const char *cardName = snd_ctl_card_info_get_name(cardInfo);
// build a valid name and open sndcard
snprintf(pcmName, sizeof (pcmName), "hw:%i,%i,%i", cardIdx, deviceIdx, subpcmNamex);
error= snd_pcm_open(&pcmHandle, pcmName, SND_PCM_STREAM_CAPTURE, SND_PCM_ASYNC);
if (error) {
AFB_ApiError(source->api,"AlsaCreateCapture: fail openpcm (hw:%d -> %s pcmNamex=%i subpcmNamex=%d): %s"
, cardIdx, cardName, deviceIdx, subpcmNamex, snd_strerror(error));
goto OnErrorExit;
}
// set default to param object
snd_pcm_hw_params_alloca(&pcmParams);
snd_pcm_hw_params_any(pcmHandle, pcmParams);
error= snd_pcm_hw_params_set_channels (pcmHandle, pcmParams, channelCount);
if (error) {
AFB_ApiError(source->api,"lsaCreateCapture: fail set channel count (hw:%d -> %s pcmNamex=%i subpcmNamex=%d channelCount=%d): %s"
, cardIdx, cardName, deviceIdx, subpcmNamex, channelCount, snd_strerror(error));
goto OnErrorExit;
}
// push selected params to PCM
error= snd_pcm_hw_params(pcmHandle, pcmParams);
if (error) {
AFB_ApiError(source->api,"lsaCreateCapture: fail pushing params (hw:%d -> %s pcmNamex=%i subpcmNamex=%d): %s"
, cardIdx, cardName, deviceIdx, subpcmNamex, snd_strerror(error));
goto OnErrorExit;
}
AFB_ApiNotice(source->api, "AlsaCreateCapture: done");
free (cardInfo);
return NULL;
OnErrorExit:
AFB_ApiNotice(source->api, "AlsaCreateCapture: OnErrorExit");
return NULL;
}
|
