1 /*
2 * Copyright 2022 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
17 #define LOG_TAG "BTAudioHearingAidAIDL"
18
19 #include "hearing_aid_software_encoding_aidl.h"
20
21 #include <bluetooth/log.h>
22
23 #include "audio_hearing_aid_hw/include/audio_hearing_aid_hw.h"
24 #include "client_interface_aidl.h"
25 #include "osi/include/properties.h"
26
27 namespace std {
28 template <>
29 struct formatter<audio_usage_t> : enum_formatter<audio_usage_t> {};
30 template <>
31 struct formatter<audio_content_type_t> : enum_formatter<audio_content_type_t> {};
32 } // namespace std
33
34 namespace {
35
36 using ::aidl::android::hardware::bluetooth::audio::ChannelMode;
37 using ::aidl::android::hardware::bluetooth::audio::CodecType;
38 using ::bluetooth::audio::aidl::AudioConfiguration;
39 using ::bluetooth::audio::aidl::BluetoothAudioCtrlAck;
40 using ::bluetooth::audio::aidl::LatencyMode;
41 using ::bluetooth::audio::aidl::PcmConfiguration;
42 using ::bluetooth::audio::aidl::SessionType;
43 using ::bluetooth::audio::aidl::hearing_aid::StreamCallbacks;
44 using namespace bluetooth;
45
46 // Transport implementation for Hearing Aids
47 class HearingAidTransport : public bluetooth::audio::aidl::IBluetoothSinkTransportInstance {
48 public:
HearingAidTransport(StreamCallbacks stream_cb)49 HearingAidTransport(StreamCallbacks stream_cb)
50 : IBluetoothSinkTransportInstance(SessionType::HEARING_AID_SOFTWARE_ENCODING_DATAPATH,
51 (AudioConfiguration){}),
52 stream_cb_(std::move(stream_cb)),
53 remote_delay_report_ms_(0),
54 total_bytes_read_(0),
55 data_position_({}) {}
56
StartRequest(bool)57 BluetoothAudioCtrlAck StartRequest(bool /*is_low_latency*/) override {
58 log::info("");
59 if (stream_cb_.on_resume_(true)) {
60 return BluetoothAudioCtrlAck::SUCCESS_FINISHED;
61 }
62 return BluetoothAudioCtrlAck::FAILURE;
63 }
64
SuspendRequest()65 BluetoothAudioCtrlAck SuspendRequest() override {
66 log::info("");
67 if (stream_cb_.on_suspend_()) {
68 uint8_t p_buf[AUDIO_STREAM_OUTPUT_BUFFER_SZ * 2];
69 ::bluetooth::audio::aidl::hearing_aid::read(p_buf, sizeof(p_buf));
70 return BluetoothAudioCtrlAck::SUCCESS_FINISHED;
71 } else {
72 return BluetoothAudioCtrlAck::FAILURE;
73 }
74 }
75
StopRequest()76 void StopRequest() override {
77 log::info("");
78 if (stream_cb_.on_suspend_()) {
79 // flush
80 uint8_t p_buf[AUDIO_STREAM_OUTPUT_BUFFER_SZ * 2];
81 ::bluetooth::audio::aidl::hearing_aid::read(p_buf, sizeof(p_buf));
82 }
83 }
84
SetLatencyMode(LatencyMode)85 void SetLatencyMode(LatencyMode /*latency_mode*/) override {}
86
GetPresentationPosition(uint64_t * remote_delay_report_ns,uint64_t * total_bytes_read,timespec * data_position)87 bool GetPresentationPosition(uint64_t* remote_delay_report_ns, uint64_t* total_bytes_read,
88 timespec* data_position) override {
89 log::verbose("data={} byte(s), timestamp={}.{}s, delay report={} msec.", total_bytes_read_,
90 data_position_.tv_sec, data_position_.tv_nsec, remote_delay_report_ms_);
91 if (remote_delay_report_ns != nullptr) {
92 *remote_delay_report_ns = remote_delay_report_ms_ * 1000000u;
93 }
94 if (total_bytes_read != nullptr) {
95 *total_bytes_read = total_bytes_read_;
96 }
97 if (data_position != nullptr) {
98 *data_position = data_position_;
99 }
100
101 return true;
102 }
103
SourceMetadataChanged(const source_metadata_v7_t & source_metadata)104 void SourceMetadataChanged(const source_metadata_v7_t& source_metadata) override {
105 auto track_count = source_metadata.track_count;
106 auto tracks = source_metadata.tracks;
107 log::info("{} track(s) received", track_count);
108 while (track_count) {
109 log::verbose("usage={}, content_type={}, gain={}", tracks->base.usage,
110 tracks->base.content_type, tracks->base.gain);
111 --track_count;
112 ++tracks;
113 }
114 }
115
SinkMetadataChanged(const sink_metadata_v7_t &)116 void SinkMetadataChanged(const sink_metadata_v7_t&) override {}
117
ResetPresentationPosition()118 void ResetPresentationPosition() override {
119 log::verbose("called.");
120 remote_delay_report_ms_ = 0;
121 total_bytes_read_ = 0;
122 data_position_ = {};
123 }
124
LogBytesRead(size_t bytes_read)125 void LogBytesRead(size_t bytes_read) override {
126 if (bytes_read) {
127 total_bytes_read_ += bytes_read;
128 clock_gettime(CLOCK_MONOTONIC, &data_position_);
129 }
130 }
131
SetRemoteDelay(uint16_t delay_report_ms)132 void SetRemoteDelay(uint16_t delay_report_ms) {
133 log::info("delay_report={} msec", delay_report_ms);
134 remote_delay_report_ms_ = delay_report_ms;
135 }
136
137 private:
138 StreamCallbacks stream_cb_;
139 uint16_t remote_delay_report_ms_;
140 uint64_t total_bytes_read_;
141 timespec data_position_;
142 };
143
HearingAidGetSelectedHalPcmConfig(PcmConfiguration * hal_pcm_config)144 bool HearingAidGetSelectedHalPcmConfig(PcmConfiguration* hal_pcm_config) {
145 if (hal_pcm_config == nullptr) {
146 return false;
147 }
148 // TODO: we only support one config for now!
149 hal_pcm_config->sampleRateHz = 16000;
150 hal_pcm_config->bitsPerSample = 16;
151 hal_pcm_config->channelMode = ChannelMode::STEREO;
152 return true;
153 }
154
155 // Sink instance of Hearing Aids to provide call-in APIs for Bluetooth Audio Hal
156 HearingAidTransport* hearing_aid_sink = nullptr;
157 // Common interface to call-out into Bluetooth Audio Hal
158 bluetooth::audio::aidl::BluetoothAudioSinkClientInterface* hearing_aid_hal_clientinterface =
159 nullptr;
160
161 // Save the value if the remote reports its delay before hearing_aid_sink is
162 // initialized
163 uint16_t remote_delay_ms = 0;
164
165 } // namespace
166
167 namespace bluetooth {
168 namespace audio {
169 namespace aidl {
170 namespace hearing_aid {
171
is_hal_enabled()172 bool is_hal_enabled() { return hearing_aid_hal_clientinterface != nullptr; }
173
init(StreamCallbacks stream_cb,bluetooth::common::MessageLoopThread *)174 bool init(StreamCallbacks stream_cb, bluetooth::common::MessageLoopThread* /*message_loop*/) {
175 log::info("");
176
177 if (!BluetoothAudioClientInterface::is_aidl_available()) {
178 log::error("BluetoothAudio AIDL implementation does not exist");
179 return false;
180 }
181
182 hearing_aid_sink = new HearingAidTransport(std::move(stream_cb));
183 hearing_aid_hal_clientinterface =
184 new bluetooth::audio::aidl::BluetoothAudioSinkClientInterface(hearing_aid_sink);
185 if (!hearing_aid_hal_clientinterface->IsValid()) {
186 log::warn("BluetoothAudio HAL for Hearing Aid is invalid?!");
187 delete hearing_aid_hal_clientinterface;
188 hearing_aid_hal_clientinterface = nullptr;
189 delete hearing_aid_sink;
190 hearing_aid_sink = nullptr;
191 return false;
192 }
193
194 if (remote_delay_ms != 0) {
195 log::info("restore DELAY {} ms", remote_delay_ms);
196 hearing_aid_sink->SetRemoteDelay(remote_delay_ms);
197 remote_delay_ms = 0;
198 }
199
200 return true;
201 }
202
cleanup()203 void cleanup() {
204 log::info("");
205 if (!is_hal_enabled()) {
206 return;
207 }
208 end_session();
209 delete hearing_aid_hal_clientinterface;
210 hearing_aid_hal_clientinterface = nullptr;
211 delete hearing_aid_sink;
212 hearing_aid_sink = nullptr;
213 remote_delay_ms = 0;
214 }
215
start_session()216 void start_session() {
217 log::info("");
218 if (!is_hal_enabled()) {
219 return;
220 }
221 AudioConfiguration audio_config;
222 PcmConfiguration pcm_config{};
223 if (!HearingAidGetSelectedHalPcmConfig(&pcm_config)) {
224 log::error("cannot get PCM config");
225 return;
226 }
227 audio_config.set<AudioConfiguration::pcmConfig>(pcm_config);
228 if (!hearing_aid_hal_clientinterface->UpdateAudioConfig(audio_config)) {
229 log::error("cannot update audio config to HAL");
230 return;
231 }
232 hearing_aid_hal_clientinterface->StartSession();
233 }
234
end_session()235 void end_session() {
236 log::info("");
237 if (!is_hal_enabled()) {
238 return;
239 }
240 hearing_aid_hal_clientinterface->EndSession();
241 }
242
read(uint8_t * p_buf,uint32_t len)243 size_t read(uint8_t* p_buf, uint32_t len) {
244 if (!is_hal_enabled()) {
245 return 0;
246 }
247 return hearing_aid_hal_clientinterface->ReadAudioData(p_buf, len);
248 }
249
250 // Update Hearing Aids delay report to BluetoothAudio HAL
set_remote_delay(uint16_t delay_report_ms)251 void set_remote_delay(uint16_t delay_report_ms) {
252 if (!is_hal_enabled()) {
253 log::info("not ready for DelayReport {} ms", delay_report_ms);
254 remote_delay_ms = delay_report_ms;
255 return;
256 }
257 log::info("delay_report_ms={} ms", delay_report_ms);
258 hearing_aid_sink->SetRemoteDelay(delay_report_ms);
259 }
260
261 } // namespace hearing_aid
262 } // namespace aidl
263 } // namespace audio
264 } // namespace bluetooth
265