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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* 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.
*
* reference :
* https://github.com/zonque/simple-alsa-loop/blob/master/loop.c
* https://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html#a31
*
*/
#define _GNU_SOURCE // needed for vasprintf
#include <pthread.h>
#include <sys/syscall.h>
#include "alsa-softmixer.h"
typedef struct {
const char *uid;
long current;
long target;
int numid;
AlsaSndCtlT *sndcard;
AlsaVolRampT *ramp;
sd_event_source *evtsrc;
SoftMixerT *mixer;
sd_event *sdLoop;
} VolRampHandleT;
STATIC int VolRampTimerCB(sd_event_source* source, uint64_t timer, void* handle) {
VolRampHandleT *rHandle = (VolRampHandleT*)handle;
int error;
uint64_t usec;
// RampDown
if (rHandle->current > rHandle->target) {
rHandle->current = rHandle->current - rHandle->ramp->stepDown;
if (rHandle->current < rHandle->target) rHandle->current = rHandle->target;
}
// RampUp
if (rHandle->current < rHandle->target) {
rHandle->current = rHandle->current + rHandle->ramp->stepUp;
if (rHandle->current > rHandle->target) rHandle->current = rHandle->target;
}
error = AlsaCtlNumidSetLong(rHandle->mixer, rHandle->sndcard, rHandle->numid, rHandle->current);
if (error) goto OnErrorExit;
// we reach target stop volram event
if (rHandle->current == rHandle->target) {
sd_event_source_unref(rHandle->evtsrc);
free(rHandle);
} else {
// otherwise validate timer for a new run
sd_event_now(rHandle->sdLoop, CLOCK_MONOTONIC, &usec);
sd_event_source_set_enabled(rHandle->evtsrc, SD_EVENT_ONESHOT);
error = sd_event_source_set_time(rHandle->evtsrc, usec + rHandle->ramp->delay);
}
return 0;
OnErrorExit:
AFB_ApiWarning(rHandle->mixer->api, "VolRampTimerCB stream=%s numid=%d value=%ld", rHandle->uid, rHandle->numid, rHandle->current);
sd_event_source_unref(source); // abandon volRamp
return -1;
}
PUBLIC int AlsaVolRampApply(SoftMixerT *mixer, AlsaSndCtlT *sndcard, AlsaStreamAudioT *stream, json_object *rampJ) {
long curvol, newvol;
const char *uid, *volS;
json_object *volJ;
int error;
uint64_t usec;
int count = 0;
error = wrap_json_unpack(rampJ, "{ss so !}"
, "uid", &uid
, "volume", &volJ
);
if (error) {
AFB_ApiError(mixer->api,
"%s: mixer=%s stream=%s invalid-json should {uid:ramp, vol:[+,-,=]value} ramp=%s",
__func__, mixer->uid, stream->uid, json_object_get_string(rampJ));
goto OnErrorExit;
}
switch (json_object_get_type(volJ)) {
case json_type_string:
volS = json_object_get_string(volJ);
switch (volS[0]) {
case '+':
count= sscanf(&volS[1], "%ld", &newvol);
newvol = curvol + newvol;
break;
case '-':
count= sscanf(&volS[1], "%ld", &newvol);
newvol = curvol - newvol;
break;
case '=':
count= sscanf(&volS[1], "%ld", &newvol);
break;
default:
// hope for int as a string and force it as relative
sscanf(&volS[0], "%ld", &newvol);
if (newvol < 0) newvol = curvol - newvol;
else newvol = curvol + newvol;
}
if (count != 1) {
AFB_ApiError(mixer->api,
"%s: mixer=%s stream=%s invalid-numeric expect {uid:%s, vol:[+,-,=]value} get vol:%s",
__func__, mixer->uid, stream->uid, uid, json_object_get_string(volJ));
goto OnErrorExit;
}
break;
case json_type_int:
newvol = json_object_get_int(volJ);
break;
default:
AFB_ApiError(mixer->api,
"%s :mixer=%s stream=%s invalid-type expect {uid:%s, vol:[+,-,=]value} get vol:%s",
__func__, mixer->uid, stream->uid, uid, json_object_get_string(volJ));
goto OnErrorExit;
}
error = AlsaCtlNumidGetLong(mixer, sndcard, stream->volume, &curvol);
if (error) {
AFB_ApiError(mixer->api,
"%s: mixer=%s stream=%s ramp=%s Fail to get volume from numid=%d",
__func__, mixer->uid, stream->uid, uid, stream->volume);
goto OnErrorExit;
}
// search for ramp uid in mixer
AlsaVolRampT * ramp;
bool found = false;
cds_list_for_each_entry(ramp, &mixer->ramps.list, list) {
if (ramp->uid && !strcasecmp(ramp->uid, uid)) {
break;
}
}
if (!found) {
AFB_ApiError(mixer->api,
"%s: mixer=%s stream=%s ramp=%s does not exit",
__func__, mixer->uid, stream->uid, uid);
goto OnErrorExit;
}
VolRampHandleT *rHandle = calloc(1, sizeof (VolRampHandleT));
if (rHandle == NULL) {
SOFTMIXER_NOMEM(mixer->api);
goto OnErrorExit;
}
rHandle->uid = stream->uid;
rHandle->numid = stream->volume;
rHandle->sndcard = sndcard;
rHandle->mixer = mixer;
rHandle->ramp = ramp;
rHandle->target = newvol;
rHandle->current = curvol;
rHandle->sdLoop = mixer->sdLoop;
// set a timer with ~250us accuracy
sd_event_now(rHandle->sdLoop, CLOCK_MONOTONIC, &usec);
(void) sd_event_add_time(rHandle->sdLoop, &rHandle->evtsrc, CLOCK_MONOTONIC, usec + 100, 250, VolRampTimerCB, rHandle);
return 0;
OnErrorExit:
return -1;
}
|
