| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ANDROID_AUDIO_HARDWARE_INTERFACE_H |
| #define ANDROID_AUDIO_HARDWARE_INTERFACE_H |
| |
| #include <stdint.h> |
| #include <sys/types.h> |
| |
| #include <utils/Errors.h> |
| #include <utils/Vector.h> |
| #include <utils/String16.h> |
| |
| #include <media/IAudioFlinger.h> |
| #include "media/AudioSystem.h" |
| |
| |
| namespace android { |
| |
| // ---------------------------------------------------------------------------- |
| |
| /** |
| * This is the abstraction interface for the audio output hardware. It provides |
| * information about various properties of the audio output hardware driver. |
| */ |
| class AudioStreamOut { |
| public: |
| virtual ~AudioStreamOut() = 0; |
| |
| /** return audio sampling rate in hz - eg. 44100 */ |
| virtual uint32_t sampleRate() const = 0; |
| |
| /** returns size of output buffer - eg. 4800 */ |
| virtual size_t bufferSize() const = 0; |
| |
| /** |
| * return number of output audio channels. |
| * Acceptable values are 1 (mono) or 2 (stereo) |
| */ |
| virtual int channelCount() const = 0; |
| |
| /** |
| * return audio format in 8bit or 16bit PCM format - |
| * eg. AudioSystem:PCM_16_BIT |
| */ |
| virtual int format() const = 0; |
| |
| /** |
| * This method can be used in situations where audio mixing is done in the |
| * hardware. It is a direct interface to the hardware to set the volume as |
| * as opposed to controlling this via the framework. It could be multiple |
| * PCM outputs or hardware accelerated codecs such as MP3 or AAC |
| */ |
| virtual status_t setVolume(float volume) = 0; |
| |
| /** write audio buffer to driver. Returns number of bytes written */ |
| virtual ssize_t write(const void* buffer, size_t bytes) = 0; |
| |
| /** dump the state of the audio output device */ |
| virtual status_t dump(int fd, const Vector<String16>& args) = 0; |
| }; |
| |
| /** |
| * This is the abstraction interface for the audio input hardware. It defines |
| * the various properties of the audio hardware input driver. |
| */ |
| class AudioStreamIn { |
| public: |
| virtual ~AudioStreamIn() = 0; |
| |
| /** return the input buffer size allowed by audio driver */ |
| virtual size_t bufferSize() const = 0; |
| |
| /** return the number of audio input channels */ |
| virtual int channelCount() const = 0; |
| |
| /** |
| * return audio format in 8bit or 16bit PCM format - |
| * eg. AudioSystem:PCM_16_BIT |
| */ |
| virtual int format() const = 0; |
| |
| /** set the input gain for the audio driver. This method is for |
| * for future use */ |
| virtual status_t setGain(float gain) = 0; |
| |
| /** read audio buffer in from audio driver */ |
| virtual ssize_t read(void* buffer, ssize_t bytes) = 0; |
| |
| /** dump the state of the audio input device */ |
| virtual status_t dump(int fd, const Vector<String16>& args) = 0; |
| }; |
| |
| /** |
| * This defines the interface to the audio hardware abstraction layer. It |
| * supports setting and getting parameters, selecting audio routing paths and |
| * defining input and output streams. |
| * |
| * AudioFlinger initializes the audio hardware and immediately opens an output |
| * stream. Audio routing can be set to output to handset, speaker, bluetooth or |
| * headset. |
| * |
| * The audio input stream is initialized when AudioFlinger is called to carry |
| * out a record operation. |
| */ |
| class AudioHardwareInterface |
| { |
| public: |
| AudioHardwareInterface(); |
| virtual ~AudioHardwareInterface() { } |
| |
| /** |
| * check to see if the audio hardware interface has been initialized. |
| * return status based on values defined in include/utils/Errors.h |
| */ |
| virtual status_t initCheck() = 0; |
| |
| /** |
| * put the audio hardware into standby mode to conserve power. Returns |
| * status based on include/utils/Errors.h |
| */ |
| virtual status_t standby() = 0; |
| |
| /** set the audio volume of a voice call. Range is between 0.0 and 1.0 */ |
| virtual status_t setVoiceVolume(float volume) = 0; |
| |
| /** |
| * set the audio volume for all audio activities other than voice call. |
| * Range between 0.0 and 1.0. IF any value other than NO_ERROR is returned, |
| * the software mixer will emulate this capability. |
| */ |
| virtual status_t setMasterVolume(float volume) = 0; |
| |
| /** |
| * Audio routing methods. Routes defined in include/hardware/AudioSystem.h. |
| * Audio routes can be (ROUTE_EARPIECE | ROUTE_SPEAKER | ROUTE_BLUETOOTH |
| * | ROUTE_HEADSET) |
| * |
| * setRouting sets the routes for a mode. This is called at startup. It is |
| * also called when a new device is connected, such as a wired headset is |
| * plugged in or a Bluetooth headset is paired |
| */ |
| virtual status_t setRouting(int mode, uint32_t routes); |
| |
| virtual status_t getRouting(int mode, uint32_t* routes); |
| |
| /** |
| * setMode is called when the audio mode changes. NORMAL mode is for |
| * standard audio playback, RINGTONE when a ringtone is playing and IN_CALL |
| * when a call is in progress. |
| */ |
| virtual status_t setMode(int mode); |
| virtual status_t getMode(int* mode); |
| |
| // mic mute |
| virtual status_t setMicMute(bool state) = 0; |
| virtual status_t getMicMute(bool* state) = 0; |
| |
| // Temporary interface, do not use |
| // TODO: Replace with a more generic key:value get/set mechanism |
| virtual status_t setParameter(const char* key, const char* value); |
| |
| /** This method creates and opens the audio hardware output stream */ |
| virtual AudioStreamOut* openOutputStream( |
| int format=0, |
| int channelCount=0, |
| uint32_t sampleRate=0) = 0; |
| |
| /** This method creates and opens the audio hardware input stream */ |
| virtual AudioStreamIn* openInputStream( |
| int format, |
| int channelCount, |
| uint32_t sampleRate) = 0; |
| |
| /**This method dumps the state of the audio hardware */ |
| virtual status_t dumpState(int fd, const Vector<String16>& args); |
| |
| static AudioHardwareInterface* create(); |
| |
| protected: |
| /** |
| * doRouting actually initiates the routing to occur. A call to setRouting |
| * or setMode may result in a routing change. The generic logic will call |
| * doRouting when required. If the device has any special requirements these |
| * methods can be overriden. |
| */ |
| virtual status_t doRouting() = 0; |
| |
| virtual status_t dump(int fd, const Vector<String16>& args) = 0; |
| |
| int mMode; |
| uint32_t mRoutes[AudioSystem::NUM_MODES]; |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| |
| extern "C" AudioHardwareInterface* createAudioHardware(void); |
| |
| }; // namespace android |
| |
| #endif // ANDROID_AUDIO_HARDWARE_INTERFACE_H |