1 /* 2 ** 3 ** Copyright 2007, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #ifndef ANDROID_AUDIO_HW_DEVICE_H 19 #define ANDROID_AUDIO_HW_DEVICE_H 20 21 #include <stdint.h> 22 #include <stdlib.h> 23 #include <sys/types.h> 24 25 #include <hardware/audio.h> 26 #include <utils/Errors.h> 27 #include <system/audio.h> 28 29 30 namespace android { 31 32 class AudioStreamOut; 33 34 class AudioHwDevice { 35 public: 36 enum Flags { 37 AHWD_CAN_SET_MASTER_VOLUME = 0x1, 38 AHWD_CAN_SET_MASTER_MUTE = 0x2, 39 }; 40 AudioHwDevice(audio_module_handle_t handle,const char * moduleName,audio_hw_device_t * hwDevice,Flags flags)41 AudioHwDevice(audio_module_handle_t handle, 42 const char *moduleName, 43 audio_hw_device_t *hwDevice, 44 Flags flags) 45 : mHandle(handle) 46 , mModuleName(strdup(moduleName)) 47 , mHwDevice(hwDevice) 48 , mFlags(flags) { } ~AudioHwDevice()49 virtual ~AudioHwDevice() { free((void *)mModuleName); } 50 canSetMasterVolume()51 bool canSetMasterVolume() const { 52 return (0 != (mFlags & AHWD_CAN_SET_MASTER_VOLUME)); 53 } 54 canSetMasterMute()55 bool canSetMasterMute() const { 56 return (0 != (mFlags & AHWD_CAN_SET_MASTER_MUTE)); 57 } 58 handle()59 audio_module_handle_t handle() const { return mHandle; } moduleName()60 const char *moduleName() const { return mModuleName; } hwDevice()61 audio_hw_device_t *hwDevice() const { return mHwDevice; } version()62 uint32_t version() const { return mHwDevice->common.version; } 63 64 /** This method creates and opens the audio hardware output stream. 65 * The "address" parameter qualifies the "devices" audio device type if needed. 66 * The format format depends on the device type: 67 * - Bluetooth devices use the MAC address of the device in the form "00:11:22:AA:BB:CC" 68 * - USB devices use the ALSA card and device numbers in the form "card=X;device=Y" 69 * - Other devices may use a number or any other string. 70 */ 71 status_t openOutputStream( 72 AudioStreamOut **ppStreamOut, 73 audio_io_handle_t handle, 74 audio_devices_t devices, 75 audio_output_flags_t flags, 76 struct audio_config *config, 77 const char *address); 78 79 private: 80 const audio_module_handle_t mHandle; 81 const char * const mModuleName; 82 audio_hw_device_t * const mHwDevice; 83 const Flags mFlags; 84 }; 85 86 } // namespace android 87 88 #endif // ANDROID_AUDIO_HW_DEVICE_H 89