1/*
2 * Copyright 2023 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
17syntax = "proto3";
18
19package mmc;
20
21option optimize_for = LITE_RUNTIME;
22
23// union of Lc3 config and codec parameters
24message Lc3Param {
25  // encoder/decoder config
26  int32 dt_us = 1;
27  int32 sr_hz = 2;
28  int32 sr_pcm_hz = 3;
29
30  // encode/decode parameter
31  enum PcmFmt {
32    kLc3PcmFormatS16 = 0;
33    kLc3PcmFormatS24 = 1;
34  }
35
36  PcmFmt fmt = 4;
37  int32 stride = 5;
38}
39
40// corresponding to SBC_ENC_PARAMS
41message SbcEncoderParam {
42  enum SamplingFreq {
43    kSbcSf16000 = 0;
44    kSbcSf32000 = 1;
45    kSbcSf44100 = 2;
46    kSbcSf48000 = 3;
47  }
48
49  enum ChannelMode {
50    kSbcMono = 0;
51    kSbcDual = 1;
52    kSbcStereo = 2;
53    kSbcJointStereo = 3;
54  }
55
56  enum AllocationMethod {
57    kSbcLoudNess = 0;
58    kSbcSnr = 1;
59  }
60
61  // Default to be kSbcFormatGeneral for SBC if not assigned.
62  // Assigning to kSbcFormatMsbc for MSBC.
63  enum Format {
64    kSbcFormatGeneral = 0;
65    kSbcFormatMsbc = 1;
66  }
67
68  // encoder config
69  int32 num_of_subbands = 1;
70  int32 num_of_channels = 2;
71  int32 num_of_blocks = 3;
72  int32 bit_pool = 4;
73  int32 bit_rate = 5;
74  SamplingFreq sampling_freq = 6;
75  ChannelMode channel_mode = 7;
76  AllocationMethod allocation_method = 8;
77  Format format = 9;
78}
79
80message SbcDecoderParam {
81  // decoder config
82  int32 max_channels = 1;
83  int32 stride = 2;
84  bool enhanced = 3;
85}
86
87message AacEncoderParam {
88  // encoder config
89  int32 sample_rate = 1;
90  int32 channel_count = 2;
91  int32 bit_rate = 3;
92
93  // encode parameter
94  int32 bit_depth = 4;
95  int32 effective_frame_size = 5;
96}
97
98// union of different codec parameters
99message ConfigParam {
100  // This determines the codec type and whether it is an encoder or a decoder.
101  oneof codec_param {
102    // HFP LC3 encoder and decoder have same parameter type.
103    Lc3Param hfp_lc3_encoder_param = 1;
104    Lc3Param hfp_lc3_decoder_param = 2;
105    // HFP MSBC use SBC parameters
106    SbcEncoderParam hfp_msbc_encoder_param = 3;
107    SbcDecoderParam hfp_msbc_decoder_param = 4;
108    AacEncoderParam a2dp_aac_encoder_param = 5;
109  }
110}
111