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 #include <list>
22 
23 #include "device_port_proxy.h"
24 
25 constexpr unsigned int kBluetoothDefaultSampleRate = 44100;
26 constexpr audio_format_t kBluetoothDefaultAudioFormatBitsPerSample =
27     AUDIO_FORMAT_PCM_16_BIT;
28 
29 constexpr unsigned int kBluetoothDefaultInputBufferMs = 20;
30 constexpr unsigned int kBluetoothDefaultInputStateTimeoutMs = 20;
31 
32 constexpr unsigned int kBluetoothDefaultOutputBufferMs = 10;
33 constexpr audio_channel_mask_t kBluetoothDefaultOutputChannelModeMask =
34     AUDIO_CHANNEL_OUT_STEREO;
35 constexpr audio_channel_mask_t kBluetoothDefaultInputChannelModeMask =
36     AUDIO_CHANNEL_IN_MONO;
37 
38 enum class BluetoothStreamState : uint8_t {
39   DISABLED = 0,  // This stream is closing or set param "suspend=true"
40   STANDBY,
41   STARTING,
42   STARTED,
43   SUSPENDING,
44   UNKNOWN,
45 };
46 
47 std::ostream& operator<<(std::ostream& os, const BluetoothStreamState& state);
48 
49 struct BluetoothStreamOut {
50   // Must be the first member so it can be cast from audio_stream
51   // or audio_stream_out pointer
52   audio_stream_out stream_out_{};
53   ::android::bluetooth::audio::BluetoothAudioPortOut bluetooth_output_;
54   int64_t last_write_time_us_;
55   // Audio PCM Configs
56   uint32_t sample_rate_;
57   audio_channel_mask_t channel_mask_;
58   audio_format_t format_;
59   // frame is the number of samples per channel
60   // frames count per tick
61   size_t frames_count_;
62   // total frames written, reset on standby
63   uint64_t frames_rendered_;
64   // total frames written after opened, never reset
65   uint64_t frames_presented_;
66   mutable std::mutex mutex_;
67 };
68 
69 struct BluetoothAudioDevice {
70   // Important: device must be first as an audio_hw_device* may be cast to
71   // BluetoothAudioDevice* when the type is implicitly known.
72   audio_hw_device audio_device_{};
73   // protect against device->output and stream_out from being inconsistent
74   std::mutex mutex_;
75   std::list<BluetoothStreamOut*> opened_stream_outs_ =
76       std::list<BluetoothStreamOut*>(0);
77 };
78 
79 struct BluetoothStreamIn {
80   // Must be the first member so it can be cast from audio_stream
81   // or audio_stream_in pointer
82   audio_stream_in stream_in_;
83   ::android::bluetooth::audio::BluetoothAudioPortIn bluetooth_input_;
84   int64_t last_read_time_us_;
85   // Audio PCM Configs
86   uint32_t sample_rate_;
87   audio_channel_mask_t channel_mask_;
88   audio_format_t format_;
89   // frame is the number of samples per channel
90   // frames count per tick
91   size_t frames_count_;
92   // total frames read after opened, never reset
93   uint64_t frames_presented_;
94   mutable std::mutex mutex_;
95 };
96 
97 int adev_open_output_stream(struct audio_hw_device* dev,
98                             audio_io_handle_t handle, audio_devices_t devices,
99                             audio_output_flags_t flags,
100                             struct audio_config* config,
101                             struct audio_stream_out** stream_out,
102                             const char* address __unused);
103 
104 void adev_close_output_stream(struct audio_hw_device* dev,
105                               struct audio_stream_out* stream);
106 
107 size_t adev_get_input_buffer_size(const struct audio_hw_device* dev,
108                                   const struct audio_config* config);
109 
110 int adev_open_input_stream(struct audio_hw_device* dev,
111                            audio_io_handle_t handle, audio_devices_t devices,
112                            struct audio_config* config,
113                            struct audio_stream_in** stream_in,
114                            audio_input_flags_t flags __unused,
115                            const char* address __unused,
116                            audio_source_t source __unused);
117 
118 void adev_close_input_stream(struct audio_hw_device* dev,
119                              struct audio_stream_in* in);
120