Merge "liboboe: initial checkin of the Oboe header files" (1c92a2ab) · Commits · e / os / android_frameworks_av

media/liboboe/README.md

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		Oboe Audio input/output API

media/liboboe/include/oboe/OboeAudio.h

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		/*
		* Copyright (C) 2016 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.
		*/

		/**
		* This is the 'C' ABI for Oboe.
		*/
		#ifndef OBOE_OBOEAUDIO_H
		#define OBOE_OBOEAUDIO_H

		#include "OboeDefinitions.h"

		typedef int32_t OboeDeviceId;
		typedef oboe_handle_t OboeStream;
		typedef oboe_handle_t OboeStreamBuilder;
		typedef oboe_handle_t OboeThread;

		#define OBOE_STREAM_NONE ((OboeStream)OBOE_HANDLE_INVALID)
		#define OBOE_STREAM_BUILDER_NONE ((OboeStreamBuilder)OBOE_HANDLE_INVALID)


		// ============================================================
		// Audio System
		// ============================================================

		/**
		* @return time in the same clock domain as the timestamps
		*/
		oboe_nanoseconds_t Oboe_getNanoseconds(oboe_clockid_t clockid);

		/**
		* The text is the ASCII symbol corresponding to the returnCode,
		* or an English message saying the returnCode is unrecognized.
		* This is intended for developers to use when debugging.
		* It is not for display to users.
		*
		* @return pointer to a text representation of an Oboe result code.
		*/
		const char * Oboe_convertResultToText(oboe_result_t returnCode);

		/**
		* The text is the ASCII symbol corresponding to the state,
		* or an English message saying the state is unrecognized.
		* This is intended for developers to use when debugging.
		* It is not for display to users.
		*
		* @return pointer to a text representation of an Oboe state.
		*/
		const char * Oboe_convertStateToText(oboe_state_t state);

		// ============================================================
		// StreamBuilder
		// ============================================================
		/**
		* Create a StreamBuilder that can be used to open a Stream.
		*
		* OboeStreamBuilder_delete() must be called when you are done using the builder.
		*/
		oboe_result_t Oboe_createStreamBuilder(OboeStreamBuilder *builder);

		/**
		* Request an audio device identified device using an ID.
		* The ID is platform specific.
		* On Android, for example, the ID could be obtained from the Java AudioManager.
		*
		* By default, the primary output device will be used.
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setDeviceId(OboeStreamBuilder builder, OboeDeviceId deviceId);

		/**
		* Request a sample rate in Hz.
		* The stream may be opened with a different sample rate.
		* So the application should query for the actual rate after the stream is opened.
		*
		* Technically, this should be called the "frame rate" or "frames per second",
		* because it refers to the number of complete frames transferred per second.
		* But it is traditionally called "sample rate". Se we use that term.
		*
		* Default is OBOE_UNSPECIFIED.
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setSampleRate(OboeStreamBuilder builder,
		oboe_sample_rate_t sampleRate);

		/**
		* Returns sample rate in Hertz (samples per second).
		* @return positive sampleRate or a negative error, zero for unspecified
		*/
		oboe_result_t OboeStreamBuilder_getSampleRate(OboeStreamBuilder builder,
		oboe_sample_rate_t *sampleRate);


		/**
		* Request a number of samples per frame.
		* The stream may be opened with a different value.
		* So the application should query for the actual value after the stream is opened.
		*
		* Default is OBOE_UNSPECIFIED.
		*
		* Note, this quantity is sometimes referred to as "channel count".
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setSamplesPerFrame(OboeStreamBuilder builder,
		int32_t samplesPerFrame);

		/**
		* Note, this quantity is sometimes referred to as "channel count".
		*
		* @param builder handle provided by Oboe_createStreamBuilder()
		* @param samplesPerFrame pointer to a variable to be set to samplesPerFrame.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_getSamplesPerFrame(OboeStreamBuilder builder,
		int32_t *samplesPerFrame);


		/**
		* Request a sample data format, for example OBOE_AUDIO_FORMAT_PCM16.
		* The application should query for the actual format after the stream is opened.
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setFormat(OboeStreamBuilder builder, oboe_audio_format_t format);

		/**
		* @return positive data format or a negative error, zero for unspecified
		*/
		oboe_result_t OboeStreamBuilder_getFormat(OboeStreamBuilder builder, oboe_audio_format_t *format);

		/**
		* Request a mode for sharing the device.
		* The requested sharing mode may not be available.
		* So the application should query for the actual mode after the stream is opened.
		*
		* @param builder handle provided by Oboe_createStreamBuilder()
		* @param sharingMode OBOE_SHARING_MODE_LEGACY or OBOE_SHARING_MODE_EXCLUSIVE
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setSharingMode(OboeStreamBuilder builder,
		oboe_sharing_mode_t sharingMode);

		/**
		* Return requested sharing mode.
		* @return OBOE_OK or a negative error
		*/
		oboe_result_t OboeStreamBuilder_getSharingMode(OboeStreamBuilder builder,
		oboe_sharing_mode_t *sharingMode);

		/**
		* Request the direction for a stream. The default is OBOE_DIRECTION_OUTPUT.
		*
		* @param builder handle provided by Oboe_createStreamBuilder()
		* @param direction OBOE_DIRECTION_OUTPUT or OBOE_DIRECTION_INPUT
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_setDirection(OboeStreamBuilder builder,
		oboe_direction_t direction);

		/**
		* @param builder handle provided by Oboe_createStreamBuilder()
		* @param direction pointer to a variable to be set to the currently requested direction.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_getDirection(OboeStreamBuilder builder,
		oboe_direction_t *direction);

		/**
		* Open a stream based on the options in the StreamBuilder.
		*
		* OboeStream_close must be called when finished with the stream to recover
		* the memory and to free the associated resources.
		*
		* @return OBOE_OK or a negative error. Also pass back a stream handle.
		*/
		oboe_result_t OboeStreamBuilder_openStream(OboeStreamBuilder builder, OboeStream *stream);

		/**
		* Delete the resources associated with the StreamBuilder.
		* @param builder handle provided by Oboe_createStreamBuilder()
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStreamBuilder_delete(OboeStreamBuilder builder);

		// ============================================================
		// Stream Control
		// ============================================================

		/**
		* Free the resources associated with a stream created by OboeStreamBuilder_openStream()
		*/
		oboe_result_t OboeStream_close(OboeStream stream);

		/**
		* Asynchronously request to start playing the stream. For output streams, one should
		* write to the stream to fill the buffer before starting.
		* Otherwise it will underflow.
		* After this call the state will be in OBOE_STATE_STARTING or OBOE_STATE_STARTED.
		*/
		oboe_result_t OboeStream_requestStart(OboeStream stream);

		/**
		* Asynchronous request for the stream to pause.
		* Pausing a stream will freeze the data flow but not flush any buffers.
		* Use OboeStream_Start() to resume playback after a pause.
		* After this call the state will be in OBOE_STATE_PAUSING or OBOE_STATE_PAUSED.
		*/
		oboe_result_t OboeStream_requestPause(OboeStream stream);

		/**
		* Asynchronous request for the stream to flush.
		* Flushing will discard any pending data.
		* This call only works if the stream is pausing or paused. TODO review
		* Frame counters are not reset by a flush. They may be advanced.
		* After this call the state will be in OBOE_STATE_FLUSHING or OBOE_STATE_FLUSHED.
		*/
		oboe_result_t OboeStream_requestFlush(OboeStream stream);

		/**
		* Asynchronous request for the stream to stop.
		* The stream will stop after all of the data currently buffered has been played.
		* After this call the state will be in OBOE_STATE_STOPPING or OBOE_STATE_STOPPED.
		*/
		oboe_result_t OboeStream_requestStop(OboeStream stream);

		/**
		* Query the current state, eg. OBOE_STATE_PAUSING
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getState(OboeStream stream, oboe_state_t *state);

		/**
		* Wait until the current state no longer matches the input state.
		*
		* <pre><code>
		* oboe_state_t currentState = OboeStream_getState(stream);
		* while (currentState >= 0 && currentState != OBOE_STATE_PAUSING) {
		* currentState = OboeStream_waitForStateChange(
		* stream, currentState, MY_TIMEOUT_MSEC);
		* }
		* </code></pre>
		*
		* @param stream A handle provided by OboeStreamBuilder_openStream()
		* @param inputState The state we want to avoid.
		* @param nextState Pointer to a variable that will be set to the new state.
		* @param timeoutNanoseconds Maximum number of nanoseconds to wait for completion.
		* @return oboe_state_t or a negative error.
		*/
		oboe_result_t OboeStream_waitForStateChange(OboeStream stream,
		oboe_state_t inputState,
		oboe_state_t *nextState,
		oboe_nanoseconds_t timeoutNanoseconds);

		// ============================================================
		// Stream I/O
		// ============================================================

		/**
		* Read data from the stream.
		*
		* The call will wait until the read is complete or until it runs out of time.
		* If timeoutNanos is zero then this call will not wait.
		*
		* Note that timeoutNanoseconds is a relative duration in wall clock time.
		* Time will not stop if the thread is asleep.
		* So it will be implemented using CLOCK_BOOTTIME.
		*
		* This call is "strong non-blocking" unless it has to wait for data.
		*
		* @param stream A stream created using OboeStreamBuilder_openStream().
		* @param buffer The address of the first sample.
		* @param numFrames Number of frames to read. Only complete frames will be written.
		* @param timeoutNanoseconds Maximum number of nanoseconds to wait for completion.
		* @return The number of frames actually written or a negative error.
		*/
		oboe_result_t OboeStream_read(OboeStream stream,
		void *buffer,
		int32_t numFrames,
		oboe_nanoseconds_t timeoutNanoseconds);

		/**
		* Write data to the stream.
		*
		* The call will wait until the write is complete or until it runs out of time.
		* If timeoutNanos is zero then this call will not wait.
		*
		* Note that timeoutNanoseconds is a relative duration in wall clock time.
		* Time will not stop if the thread is asleep.
		* So it will be implemented using CLOCK_BOOTTIME.
		*
		* This call is "strong non-blocking" unless it has to wait for room in the buffer.
		*
		* @param stream A stream created using OboeStreamBuilder_openStream().
		* @param buffer The address of the first sample.
		* @param numFrames Number of frames to write. Only complete frames will be written.
		* @param timeoutNanoseconds Maximum number of nanoseconds to wait for completion.
		* @return The number of frames actually written or a negative error.
		*/
		oboe_result_t OboeStream_write(OboeStream stream,
		const void *buffer,
		int32_t numFrames,
		oboe_nanoseconds_t timeoutNanoseconds);


		// ============================================================
		// High priority audio threads
		// ============================================================

		/**
		* Create a thread with special properties for low latency audio performance.
		* This thread can be used to implement a callback API.
		*
		* Note that this API is in flux.
		*
		* @param threadHandlePtr a pointer to receive a thread handle
		* @param periodNanoseconds the estimated period at which the audio thread will need to wake up
		* @param start_routine your thread entry point
		* @param arg an argument that will be passed to your thread entry point
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t Oboe_createAudioThread(OboeThread *threadHandlePtr,
		oboe_nanoseconds_t periodNanoseconds,
		void (start_routine)(void ), void arg);

		/**
		* Wait until the thread exits or an error occurs.
		* The thread handle will be deleted.
		*
		* @param thread the thread handle passed back from Oboe_createAudioThread()
		* @param returnArg a pointer to a variable to receive the return value
		* @param timeoutNanoseconds Maximum number of nanoseconds to wait for completion.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t Oboe_joinAudioThread(OboeThread thread,
		void **returnArg,
		oboe_nanoseconds_t timeoutNanoseconds);

		// ============================================================
		// Stream - queries
		// ============================================================


		/**
		* This can be used to adjust the latency of the buffer by changing
		* the threshold where blocking will occur.
		* By combining this with OboeStream_getUnderrunCount(), the latency can be tuned
		* at run-time for each device.
		*
		* This cannot be set higher than OboeStream_getBufferCapacity().
		*
		* @param stream handle provided by OboeStreamBuilder_openStream()
		* @param frames requested number of frames that can be filled without blocking
		* @return actual number of frames or a negative error
		*/
		oboe_result_t OboeStream_setBufferSize(OboeStream stream, oboe_size_frames_t frames);

		/**
		* Query the maximum number of frames that can be filled without blocking.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getBufferSize(OboeStream stream, oboe_size_frames_t *frames);

		/**
		* Query the number of frames that are read or written by the endpoint at one time.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getFramesPerBurst(OboeStream stream, oboe_size_frames_t *frames);

		/**
		* Query maximum buffer capacity in frames.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getBufferCapacity(OboeStream stream, oboe_size_frames_t *frames);

		/**
		* An XRun is an Underrun or an Overrun.
		* During playing, an underrun will occur if the stream is not written in time
		* and the system runs out of valid data.
		* During recording, an overrun will occur if the stream is not read in time
		* and there is no place to put the incoming data so it is discarded.
		*
		* An underrun or overrun can cause an audible "pop" or "glitch".
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getXRunCount(OboeStream stream, int32_t *xRunCount);

		/**
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getSampleRate(OboeStream stream, int32_t *sampleRate);

		/**
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getSamplesPerFrame(OboeStream stream, int32_t *samplesPerFrame);

		/**
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getFormat(OboeStream stream, oboe_audio_format_t *format);

		/**
		* Provide actual sharing mode.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getSharingMode(OboeStream stream,
		oboe_sharing_mode_t *sharingMode);

		/**
		* @param stream handle provided by OboeStreamBuilder_openStream()
		* @param direction pointer to a variable to be set to the current direction.
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getDirection(OboeStream stream, uint32_t *direction);

		/**
		* Passes back the number of frames that have been written since the stream was created.
		* For an output stream, this will be advanced by the application calling write().
		* For an input stream, this will be advanced by the device or service.
		*
		* The frame position is monotonically increasing.
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getFramesWritten(OboeStream stream, oboe_position_frames_t *frames);

		/**
		* Passes back the number of frames that have been read since the stream was created.
		* For an output stream, this will be advanced by the device or service.
		* For an input stream, this will be advanced by the application calling read().
		*
		* The frame position is monotonically increasing.
		*
		* @return OBOE_OK or a negative error.
		*/
		oboe_result_t OboeStream_getFramesRead(OboeStream stream, oboe_position_frames_t *frames);

		/**
		* Passes back the time at which a particular frame was presented.
		* This can be used to synchronize audio with video or MIDI.
		* It can also be used to align a recorded stream with a playback stream.
		*
		* Timestamps are only valid when the stream is in OBOE_STATE_STARTED.
		* OBOE_ERROR_INVALID_STATE will be returned if the stream is not started.
		* Note that because requestStart() is asynchronous, timestamps will not be valid until
		* a short time after calling requestStart().
		* So OBOE_ERROR_INVALID_STATE should not be considered a fatal error.
		* Just try calling again later.
		*
		* If an error occurs, then the position and time will not be modified.
		*
		* The position and time passed back are monotonically increasing.
		*
		* @param stream A handle provided by OboeStreamBuilder_openStream()
		* @param clockId OBOE_CLOCK_MONOTONIC or OBOE_CLOCK_BOOTTIME
		* @param framePosition pointer to a variable to receive the position
		* @param timeNanoseconds pointer to a variable to receive the time
		* @return OBOE_OK or a negative error
		*/
		oboe_result_t OboeStream_getTimestamp(OboeStream stream,
		oboe_clockid_t clockid,
		oboe_position_frames_t *framePosition,
		oboe_nanoseconds_t *timeNanoseconds);

		#endif //NATIVEOBOE_OBOEAUDIO_H

media/liboboe/include/oboe/OboeDefinitions.h

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		/*
		* Copyright (C) 2016 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 OBOE_OBOEDEFINITIONS_H
		#define OBOE_OBOEDEFINITIONS_H

		#include <stdint.h>

		typedef int32_t oboe_handle_t;
		typedef int32_t oboe_result_t;
		typedef int32_t oboe_sample_rate_t;
		/** This is used for small quantities such as the number of frames in a buffer. */
		typedef int32_t oboe_size_frames_t;
		/** This is used for large quantities, such as the number of frames that have
		* been played since a stream was started.
		* At 48000 Hz, a 32-bit integer would wrap around in just over 12 hours.
		*/
		typedef int64_t oboe_position_frames_t;

		typedef int64_t oboe_nanoseconds_t;
		typedef uint32_t oboe_audio_format_t;

		/**
		* This is used to represent a value that has not been specified.
		* For example, an application could use OBOE_UNSPECIFIED to indicate
		* that is did not not care what the specific value of a parameter was
		* and would accept whatever it was given.
		*/
		#define OBOE_UNSPECIFIED 0
		#define OBOE_NANOS_PER_MICROSECOND ((int64_t)1000)
		#define OBOE_NANOS_PER_MILLISECOND (OBOE_NANOS_PER_MICROSECOND * 1000)
		#define OBOE_MILLIS_PER_SECOND 1000
		#define OBOE_NANOS_PER_SECOND (OBOE_NANOS_PER_MILLISECOND * OBOE_MILLIS_PER_SECOND)

		#define OBOE_HANDLE_INVALID ((oboe_handle_t)-1)

		enum oboe_direction_t {
		OBOE_DIRECTION_OUTPUT,
		OBOE_DIRECTION_INPUT,
		OBOE_DIRECTION_COUNT // This should always be last.
		};

		enum {
		OBOE_AUDIO_DATATYPE_INT16,
		OBOE_AUDIO_DATATYPE_INT32,
		OBOE_AUDIO_DATATYPE_INT824,
		OBOE_AUDIO_DATATYPE_UINT8,
		OBOE_AUDIO_DATATYPE_FLOAT32, // Add new values below.
		OBOE_AUDIO_DATATYPE_COUNT // This should always be last.
		};

		enum {
		OBOE_AUDIO_CONTENT_PCM,
		OBOE_AUDIO_CONTENT_MP3,
		OBOE_AUDIO_CONTENT_AAC,
		OBOE_AUDIO_CONTENT_AC3,
		OBOE_AUDIO_CONTENT_EAC3,
		OBOE_AUDIO_CONTENT_DTS,
		OBOE_AUDIO_CONTENT_DTSHD, // Add new values below.
		OBOE_AUDIO_CONTENT_COUNT // This should always be last.
		};

		enum {
		OBOE_AUDIO_WRAPPER_NONE,
		OBOE_AUDIO_WRAPPER_IEC61937, // Add new values below.
		OBOE_AUDIO_WRAPPER_COUNT // This should always be last.
		};

		/**
		* Fields packed into oboe_audio_format_t, from most to least significant bits.
		* Reserved:8
		* Wrapper:8
		* Content:8
		* Data Type:8
		*/
		#define OBOE_AUDIO_FORMAT(dataType, content, wrapper) \
		((oboe_audio_format_t)((wrapper << 16) \| (content << 8) \| dataType))

		#define OBOE_AUDIO_FORMAT_RAW(dataType, content) \
		OBOE_AUDIO_FORMAT(dataType, content, OBOE_AUDIO_WRAPPER_NONE)

		#define OBOE_AUDIO_FORMAT_DATA_TYPE(format) \
		(format & 0x0FF)

		// Define some common formats.
		#define OBOE_AUDIO_FORMAT_PCM16 \
		OBOE_AUDIO_FORMAT_RAW(OBOE_AUDIO_DATATYPE_INT16, OBOE_AUDIO_CONTENT_PCM)
		#define OBOE_AUDIO_FORMAT_PCM_FLOAT \
		OBOE_AUDIO_FORMAT_RAW(OBOE_AUDIO_DATATYPE_FLOAT32, OBOE_AUDIO_CONTENT_PCM)
		#define OBOE_AUDIO_FORMAT_PCM824 \
		OBOE_AUDIO_FORMAT_RAW(OBOE_AUDIO_DATATYPE_INT824, OBOE_AUDIO_CONTENT_PCM)

		enum {
		OBOE_OK,
		OBOE_ERROR_BASE = -900, // TODO review
		OBOE_ERROR_DISCONNECTED,
		OBOE_ERROR_ILLEGAL_ARGUMENT,
		OBOE_ERROR_INCOMPATIBLE,
		OBOE_ERROR_INTERNAL, // an underlying API returned an error code
		OBOE_ERROR_INVALID_STATE,
		OBOE_ERROR_UNEXPECTED_STATE,
		OBOE_ERROR_UNEXPECTED_VALUE,
		OBOE_ERROR_INVALID_HANDLE,
		OBOE_ERROR_INVALID_QUERY,
		OBOE_ERROR_UNIMPLEMENTED,
		OBOE_ERROR_UNAVAILABLE,
		OBOE_ERROR_NO_FREE_HANDLES,
		OBOE_ERROR_NO_MEMORY,
		OBOE_ERROR_NULL,
		OBOE_ERROR_TIMEOUT,
		OBOE_ERROR_WOULD_BLOCK,
		OBOE_ERROR_INVALID_ORDER
		};

		typedef enum {
		OBOE_CLOCK_MONOTONIC, // Clock since booted, pauses when CPU is sleeping.
		OBOE_CLOCK_BOOTTIME, // Clock since booted, runs all the time.
		OBOE_CLOCK_COUNT // This should always be last.
		} oboe_clockid_t;

		typedef enum
		{
		OBOE_STATE_UNINITIALIZED = 0,
		OBOE_STATE_OPEN,
		OBOE_STATE_STARTING,
		OBOE_STATE_STARTED,
		OBOE_STATE_PAUSING,
		OBOE_STATE_PAUSED,
		OBOE_STATE_FLUSHING,
		OBOE_STATE_FLUSHED,
		OBOE_STATE_STOPPING,
		OBOE_STATE_STOPPED,
		OBOE_STATE_CLOSING,
		OBOE_STATE_CLOSED,
		} oboe_state_t;

		// TODO review API
		typedef enum {
		/**
		* This will use an AudioTrack object for playing audio
		* and an AudioRecord for recording data.
		*/
		OBOE_SHARING_MODE_LEGACY,
		/**
		* This will be the only stream using a particular source or sink.
		* This mode will provide the lowest possible latency.
		* You should close EXCLUSIVE streams immediately when you are not using them.
		*/
		OBOE_SHARING_MODE_EXCLUSIVE,
		/**
		* Multiple applications will be mixed by the Oboe Server.
		* This will have higher latency than the EXCLUSIVE mode.
		*/
		OBOE_SHARING_MODE_SHARED,
		/**
		* Multiple applications will do their own mixing into a memory mapped buffer.
		* It may be possible for malicious applications to read the data produced by
		* other apps. So do not use this for private data such as telephony or messaging.
		*/
		OBOE_SHARING_MODE_PUBLIC_MIX,
		OBOE_SHARING_MODE_COUNT // This should always be last.
		} oboe_sharing_mode_t;

		#endif // OBOE_OBOEDEFINITIONS_H

media/liboboe/include/oboe/README.md

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		Oboe Audio headers

		This folder contains the public header files.