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