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
|
/*
* Copyright 2020 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.
*/
package android.hardware.bluetooth.audio@2.1;
import @2.0::BitsPerSample;
import @2.0::ChannelMode;
import @2.0::CodecCapabilities;
import @2.0::CodecConfiguration;
import @2.0::CodecType;
import @2.0::PcmParameters;
import @2.0::SampleRate;
import @2.0::SessionType;
enum SessionType : @2.0::SessionType {
/** Used when encoded by Bluetooth Stack and streaming to LE Audio device */
LE_AUDIO_SOFTWARE_ENCODING_DATAPATH,
/** Used when decoded by Bluetooth Stack and streaming to audio framework */
LE_AUDIO_SOFTWARE_DECODED_DATAPATH,
/** Encoding is done by HW an there is control only */
LE_AUDIO_HARDWARE_OFFLOAD_ENCODING_DATAPATH,
/** Decoding is done by HW an there is control only */
LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH,
};
enum CodecType : @2.0::CodecType {
LC3 = 0x20,
};
enum SampleRate : @2.0::SampleRate {
RATE_8000 = 0x100,
RATE_32000 = 0x200,
};
/** Used for Software Encoding audio feed parameters */
struct PcmParameters {
SampleRate sampleRate;
ChannelMode channelMode;
BitsPerSample bitsPerSample;
/** Data interval for data transfer */
uint32_t dataIntervalUs;
};
enum Lc3FrameDuration : uint8_t {
DURATION_10000US = 0x00,
DURATION_7500US = 0x01,
};
/**
* Used for Hardware Encoding/Decoding LC3 codec parameters.
*/
struct Lc3Parameters {
/* PCM is Input for encoder, Output for decoder */
BitsPerSample pcmBitDepth;
/* codec-specific parameters */
SampleRate samplingFrequency;
Lc3FrameDuration frameDuration;
/* length in octets of a codec frame */
uint32_t octetsPerFrame;
/* Number of blocks of codec frames per single SDU (Service Data Unit) */
uint8_t blocksPerSdu;
};
/**
* Used to specify the capabilities of the LC3 codecs supported by Hardware Encoding.
*/
struct Lc3CodecCapabilities {
/* This is bitfield, if bit N is set, HW Offloader supports N+1 channels at the same time.
* Example: 0x27 = 0b00100111: One, two, three or six channels supported.*/
uint8_t supportedChannelCounts;
Lc3Parameters lc3Capabilities;
};
/** Used to specify the capabilities of the different session types */
safe_union AudioCapabilities {
PcmParameters pcmCapabilities;
CodecCapabilities codecCapabilities;
Lc3CodecCapabilities leAudioCapabilities;
};
/**
* Used to configure a LC3 Hardware Encoding session.
*/
struct Lc3CodecConfiguration {
/* This is also bitfield, specifying how the channels are ordered in the outgoing media packet.
* Bit meaning is defined in Bluetooth Assigned Numbers. */
uint32_t audioChannelAllocation;
Lc3Parameters lc3Config;
};
/** Used to configure either a Hardware or Software Encoding session based on session type */
safe_union AudioConfiguration {
PcmParameters pcmConfig;
CodecConfiguration codecConfig;
Lc3CodecConfiguration leAudioCodecConfig;
};
|
