AudioPolicyHelper.h revision 275e8e9de2e11b4b344f5a201f1f0e51fda02d9c 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#ifndef AUDIO_POLICY_HELPER_H_
17#define AUDIO_POLICY_HELPER_H_
18
19#include <system/audio.h>
20
21static audio_stream_type_t audio_attributes_to_stream_type(const audio_attributes_t *attr)
22{
23    // flags to stream type mapping
24    if ((attr->flags & AUDIO_FLAG_AUDIBILITY_ENFORCED) == AUDIO_FLAG_AUDIBILITY_ENFORCED) {
25        return AUDIO_STREAM_ENFORCED_AUDIBLE;
26    }
27    if ((attr->flags & AUDIO_FLAG_SCO) == AUDIO_FLAG_SCO) {
28        return AUDIO_STREAM_BLUETOOTH_SCO;
29    }
30
31    // usage to stream type mapping
32    switch (attr->usage) {
33    case AUDIO_USAGE_MEDIA:
34    case AUDIO_USAGE_GAME:
35    case AUDIO_USAGE_ASSISTANCE_ACCESSIBILITY:
36    case AUDIO_USAGE_ASSISTANCE_NAVIGATION_GUIDANCE:
37        return AUDIO_STREAM_MUSIC;
38    case AUDIO_USAGE_ASSISTANCE_SONIFICATION:
39        return AUDIO_STREAM_SYSTEM;
40    case AUDIO_USAGE_VOICE_COMMUNICATION:
41        return AUDIO_STREAM_VOICE_CALL;
42
43    case AUDIO_USAGE_VOICE_COMMUNICATION_SIGNALLING:
44        return AUDIO_STREAM_DTMF;
45
46    case AUDIO_USAGE_ALARM:
47        return AUDIO_STREAM_ALARM;
48    case AUDIO_USAGE_NOTIFICATION_TELEPHONY_RINGTONE:
49        return AUDIO_STREAM_RING;
50
51    case AUDIO_USAGE_NOTIFICATION:
52    case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_REQUEST:
53    case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_INSTANT:
54    case AUDIO_USAGE_NOTIFICATION_COMMUNICATION_DELAYED:
55    case AUDIO_USAGE_NOTIFICATION_EVENT:
56        return AUDIO_STREAM_NOTIFICATION;
57
58    case AUDIO_USAGE_UNKNOWN:
59    default:
60        return AUDIO_STREAM_MUSIC;
61    }
62}
63
64static void stream_type_to_audio_attributes(audio_stream_type_t streamType,
65                                     audio_attributes_t *attr) {
66    memset(attr, 0, sizeof(audio_attributes_t));
67
68    switch (streamType) {
69    case AUDIO_STREAM_DEFAULT:
70    case AUDIO_STREAM_MUSIC:
71        attr->content_type = AUDIO_CONTENT_TYPE_MUSIC;
72        attr->usage = AUDIO_USAGE_MEDIA;
73        break;
74    case AUDIO_STREAM_VOICE_CALL:
75        attr->content_type = AUDIO_CONTENT_TYPE_SPEECH;
76        attr->usage = AUDIO_USAGE_VOICE_COMMUNICATION;
77        break;
78    case AUDIO_STREAM_ENFORCED_AUDIBLE:
79        attr->flags  |= AUDIO_FLAG_AUDIBILITY_ENFORCED;
80        // intended fall through, attributes in common with STREAM_SYSTEM
81    case AUDIO_STREAM_SYSTEM:
82        attr->content_type = AUDIO_CONTENT_TYPE_SONIFICATION;
83        attr->usage = AUDIO_USAGE_ASSISTANCE_SONIFICATION;
84        break;
85    case AUDIO_STREAM_RING:
86        attr->content_type = AUDIO_CONTENT_TYPE_SONIFICATION;
87        attr->usage = AUDIO_USAGE_NOTIFICATION_TELEPHONY_RINGTONE;
88        break;
89    case AUDIO_STREAM_ALARM:
90        attr->content_type = AUDIO_CONTENT_TYPE_SONIFICATION;
91        attr->usage = AUDIO_USAGE_ALARM;
92        break;
93    case AUDIO_STREAM_NOTIFICATION:
94        attr->content_type = AUDIO_CONTENT_TYPE_SONIFICATION;
95        attr->usage = AUDIO_USAGE_NOTIFICATION;
96        break;
97    case AUDIO_STREAM_BLUETOOTH_SCO:
98        attr->content_type = AUDIO_CONTENT_TYPE_SPEECH;
99        attr->usage = AUDIO_USAGE_VOICE_COMMUNICATION;
100        attr->flags |= AUDIO_FLAG_SCO;
101        break;
102    case AUDIO_STREAM_DTMF:
103        attr->content_type = AUDIO_CONTENT_TYPE_SONIFICATION;
104        attr->usage = AUDIO_USAGE_VOICE_COMMUNICATION_SIGNALLING;
105        break;
106    case AUDIO_STREAM_TTS:
107        attr->content_type = AUDIO_CONTENT_TYPE_SPEECH;
108        attr->usage = AUDIO_USAGE_ASSISTANCE_ACCESSIBILITY;
109        break;
110    default:
111        ALOGE("invalid stream type %d when converting to attributes", streamType);
112    }
113}
114
115#endif //AUDIO_POLICY_HELPER_H_
116