1 /*
2  * Copyright 2019 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 #pragma once
18 
19 #include <hardware/audio.h>
20 #include <system/audio.h>
21 
22 #include <list>
23 
24 #include "device_port_proxy.h"
25 #include "device_port_proxy_hidl.h"
26 
27 constexpr unsigned int kBluetoothDefaultSampleRate = 44100;
28 constexpr audio_format_t kBluetoothDefaultAudioFormatBitsPerSample = AUDIO_FORMAT_PCM_16_BIT;
29 
30 constexpr unsigned int kBluetoothDefaultInputBufferMs = 20;
31 constexpr unsigned int kBluetoothDefaultInputStateTimeoutMs = 20;
32 
33 constexpr unsigned int kBluetoothDefaultOutputBufferMs = 10;
34 constexpr unsigned int kBluetoothSpatializerOutputBufferMs = 10;
35 
36 constexpr audio_channel_mask_t kBluetoothDefaultOutputChannelModeMask = AUDIO_CHANNEL_OUT_STEREO;
37 constexpr audio_channel_mask_t kBluetoothDefaultInputChannelModeMask = AUDIO_CHANNEL_IN_MONO;
38 
39 enum class BluetoothStreamState : uint8_t {
40   DISABLED = 0,  // This stream is closing or set param "suspend=true"
41   STANDBY,
42   STARTING,
43   STARTED,
44   SUSPENDING,
45   UNKNOWN,
46 };
47 
48 std::ostream& operator<<(std::ostream& os, const BluetoothStreamState& state);
49 
50 struct BluetoothStreamOut {
51   // Must be the first member so it can be cast from audio_stream
52   // or audio_stream_out pointer
53   audio_stream_out stream_out_{};
54   std::unique_ptr<::android::bluetooth::audio::BluetoothAudioPort> bluetooth_output_;
55   bool is_aidl;
56   int64_t last_write_time_us_;
57   // Audio PCM Configs
58   uint32_t sample_rate_;
59   audio_channel_mask_t channel_mask_;
60   audio_format_t format_;
61   size_t preferred_data_interval_us;
62   // frame is the number of samples per channel
63   // frames count per tick
64   size_t frames_count_;
65   // total frames written, reset on standby
66   uint64_t frames_rendered_;
67   // total frames written after opened, never reset
68   uint64_t frames_presented_;
69   mutable std::mutex mutex_;
70 };
71 
72 struct BluetoothAudioDevice {
73   // Important: device must be first as an audio_hw_device* may be cast to
74   // BluetoothAudioDevice* when the type is implicitly known.
75   audio_hw_device audio_device_{};
76   // protect against device->output and stream_out from being inconsistent
77   std::mutex mutex_;
78   std::list<BluetoothStreamOut*> opened_stream_outs_ = std::list<BluetoothStreamOut*>(0);
79   uint32_t next_unique_id = 1;
80 };
81 
82 struct BluetoothStreamIn {
83   // Must be the first member so it can be cast from audio_stream
84   // or audio_stream_in pointer
85   audio_stream_in stream_in_;
86   std::unique_ptr<::android::bluetooth::audio::BluetoothAudioPort> bluetooth_input_;
87   bool is_aidl;
88   int64_t last_read_time_us_;
89   // Audio PCM Configs
90   uint32_t sample_rate_;
91   audio_channel_mask_t channel_mask_;
92   audio_format_t format_;
93   size_t preferred_data_interval_us;
94   // frame is the number of samples per channel
95   // frames count per tick
96   size_t frames_count_;
97   // total frames read after opened, never reset
98   uint64_t frames_presented_;
99   mutable std::mutex mutex_;
100 };
101 
102 int adev_open_output_stream(struct audio_hw_device* dev, audio_io_handle_t handle,
103                             audio_devices_t devices, audio_output_flags_t flags,
104                             struct audio_config* config, struct audio_stream_out** stream_out,
105                             const char* address __unused);
106 
107 void adev_close_output_stream(struct audio_hw_device* dev, struct audio_stream_out* stream);
108 
109 size_t adev_get_input_buffer_size(const struct audio_hw_device* dev,
110                                   const struct audio_config* config);
111 
112 int adev_open_input_stream(struct audio_hw_device* dev, audio_io_handle_t handle,
113                            audio_devices_t devices, struct audio_config* config,
114                            struct audio_stream_in** stream_in, audio_input_flags_t flags __unused,
115                            const char* address __unused, audio_source_t source __unused);
116 
117 void adev_close_input_stream(struct audio_hw_device* dev, struct audio_stream_in* in);
118