VTrain/tools/jetson_multimedia/include/Argus/EGLStream.h

/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of NVIDIA CORPORATION nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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/**
 * @file
 * <b>Libargus API: EGLStream API</b>
 *
 * @b Description: This file defines an EGLStream-linked OutputStream type.
 */

#ifndef _ARGUS_EGL_STREAM_H
#define _ARGUS_EGL_STREAM_H

namespace Argus
{

/**
 * @defgroup ArgusEGLOutputStream EGLOutputStream
 * @ingroup ArgusOutputStream
 * @ref ArgusOutputStream type that generates frames as an EGLStream producer (STREAM_TYPE_EGL).
 *
 * EGLStream-linked OutputStream objects maintain a connection to an EGLStream
 * as the producer endpoint. The EGLStream implementation is responsible for
 * buffer allocation, management, and synchronization as frames are presented
 * to the EGLStream from libargus and then consumed using an EGLStream consumer.
 */
/**
 * @defgroup ArgusEGLOutputStreamSettings EGLOutputStreamSettings
 * @ingroup ArgusOutputStreamSettings
 * Settings type used to configure/create @ref ArgusEGLOutputStream streams (STREAM_TYPE_EGL).
 */

/**
 * @ref ArgusOutputStream type that generates frames as an EGLStream producer (STREAM_TYPE_EGL).
 * @ingroup ArgusOutputStream ArgusOutputStreamSettings
 */
DEFINE_UUID(StreamType, STREAM_TYPE_EGL, 3a659360,5231,11e7,9598,18,00,20,0c,9a,66);

/**
 * Defines the EGLStream queue mode of operation (see IEGLOutputStreamSettings::setMode).
 */
DEFINE_NAMED_UUID_CLASS(EGLStreamMode);
DEFINE_UUID(EGLStreamMode, EGL_STREAM_MODE_MAILBOX, 33661d40,3ee2,11e6,bdf4,08,00,20,0c,9a,66);
DEFINE_UUID(EGLStreamMode, EGL_STREAM_MODE_FIFO,    33661d41,3ee2,11e6,bdf4,08,00,20,0c,9a,66);

/**
 * @class IEGLOutputStreamSettings
 *
 * Interface that exposes the settings used for EGLStream-linked OutputStream creation.
 *
 * @ingroup ArgusEGLOutputStreamSettings
 */
DEFINE_UUID(InterfaceID, IID_EGL_OUTPUT_STREAM_SETTINGS, 3a659361,5231,11e7,9598,18,00,20,0c,9a,66);
class IEGLOutputStreamSettings : public Interface
{
public:
    static const InterfaceID& id() { return IID_EGL_OUTPUT_STREAM_SETTINGS; }

    /**
     * Set the format of the stream.
     *   Default value: PIXEL_FMT_UNKNOWN
     */
    virtual Status setPixelFormat(const PixelFormat& format) = 0;
    virtual PixelFormat getPixelFormat() const = 0;

    /**
     * Set the resolution of the stream.
     *   Default value: (0, 0)
     */
    virtual Status setResolution(const Size2D<uint32_t>& resolution) = 0;
    virtual Size2D<uint32_t> getResolution() const = 0;

    /**
     * Set the number of exposures per stream frame.
     * This number should match the number of exposures that are going to be provided
     * with each stream frame when capturing from multi-exposure WDR sources.
     * Note that the EGLStream consumer must support consuming multi-exposure/buffer
     * EGLStreams. In the case of the EGLStream::FrameConsumer consumer, the multiple
     * exposures are treated as separate buffers in the acquired Image and may be
     * accessed using any Image interface which supports multi-buffer/plane image access
     * (see EGLStream::IImage::getBufferCount()).
     *   Default value: 1
     */
    virtual Status setExposureCount(uint32_t exposureCount) = 0;
    virtual uint32_t getExposureCount() const = 0;

    /**
     * Set the EGLDisplay the created stream must belong to.
     *   Default value: EGL_NO_DISPLAY - stream is display-agnostic.
     */
    virtual Status setEGLDisplay(EGLDisplay eglDisplay) = 0;
    virtual EGLDisplay getEGLDisplay() const = 0;

    /**
     * Sets the mode of the OutputStream. Available options are:
     *
     *   MAILBOX:
     *     In this mode, only the newest frame is made available to the consumer. When Argus
     *     completes a frame it empties the mailbox and inserts the new frame into the mailbox.
     *     The consumer then retrieves the frame from the mailbox and processes it; when
     *     finished, the frame is either placed back into the mailbox (if the mailbox is empty)
     *     or discarded (if the mailbox is not empty). This mode implies 2 things:
     *
     *       - If the consumer consumes frames slower than Argus produces frames, then some
     *         frames may be lost (never seen by the consumer).
     *
     *       - If the consumer consumes frames faster than Argus produces frames, then the
     *         consumer may see some frames more than once.
     *
     *   FIFO:
     *     When using this mode, every producer frame is made available to the consumer through
     *     the use of a fifo queue for the frames. When using this mode, the fifo queue length
     *     must be specified using setFifoLength. When Argus completes a frame it inserts it to
     *     the head of the fifo queue. If the fifo is full (already contains the number of frames
     *     equal to the fifo queue length), Argus will stall until the fifo is no longer
     *     full. The consumer consumes frames from the tail of the queue; however, if the
     *     consumer releases a frame while the queue is empty, the frame is set aside and will
     *     be returned again the next time the consumer requests a frame if another new frame
     *     has not been inserted into the fifo queue before then. Once a new frame is inserted
     *     into the fifo queue, any previously released frame will be permanently discarded.
     *     This mode implies:
     *
     *       - Frames are never discarded until the consumer has processed them.
     *
     *       - If the consumer consumes frames slower than Argus produces them, Argus will stall.
     *
     *       - If the consumer consumes frames faster than Argus produces them, then the
     *         consumer may see some frames more than once.
     *
     *   Default value: STREAM_MODE_MAILBOX
     */
    virtual Status setMode(const EGLStreamMode& mode) = 0;
    virtual EGLStreamMode getMode() const = 0;

    /**
     * Sets the FIFO queue length of the stream. This value is only used if the stream is using
     * the FIFO mode (@see OutputStreamSettings::setMode). Value must be > 0.
     *   Default value: 1
     */
    virtual Status setFifoLength(uint32_t fifoLength) = 0;
    virtual uint32_t getFifoLength() const = 0;

    /**
     * Enables or disables embedding Argus CaptureMetadata within frames written to the EGLStream.
     * Enabling this will allow an EGLStream::MetadataContainer to be created from frames acquired
     * on the consumer side of the EGLStream that will expose the EGLStream::IArgusCaptureMetadata
     * interface, which in turn provides access to the CaptureMetadata corresponding to that frame.
     * This will also enable the IArgusCaptureMetadata interface directly on EGLStream::Frames
     * acquired by an EGLStream::FrameConsumer.
     *   Default value: disabled.
     */
    virtual Status setMetadataEnable(bool metadataEnable) = 0;
    virtual bool getMetadataEnable() const = 0;

    /**
     * @returns True if the output pixel format is supported by the CaptureSession for the
     * queried sensor mode. Otherwise, returns false.
     *
     * @param[in] sensorMode The sensor mode being queried for the output pixel type.
     * @param[in] outputFormat The output pixel format being queried for support.
     */
    virtual bool supportsOutputStreamFormat(const SensorMode* sensorMode,
                                            const PixelFormat& outputFormat) const = 0;

protected:
    ~IEGLOutputStreamSettings() {}
};

/**
 * @class IEGLOutputStream
 *
 * Interface that exposes the methods available to an EGLStream-linked OutputStream.
 *
 * @ingroup ArgusEGLOutputStream
 */
DEFINE_UUID(InterfaceID, IID_EGL_OUTPUT_STREAM, 3a659362,5231,11e7,9598,18,00,20,0c,9a,66);
class IEGLOutputStream : public Interface
{
public:
    static const InterfaceID& id() { return IID_EGL_OUTPUT_STREAM; }

    /**
     * Waits until both the producer and consumer endpoints of the stream are connected.
     *
     * @param[in] timeout The timeout in nanoseconds.
     *
     * @returns success/status of this call.
     */
    virtual Status waitUntilConnected(uint64_t timeout = TIMEOUT_INFINITE) const = 0;

    /**
     * Disconnects the stream from the underlying EGLStream.
     */
    virtual void disconnect() = 0;

    /**
     * Returns the format of the stream.
     */
    virtual PixelFormat getPixelFormat() const = 0;

    /**
     * Returns the image resolution of the stream, in pixels.
     */
    virtual Size2D<uint32_t> getResolution() const = 0;

    /**
     * Returns the EGLDisplay the stream's EGLStream belongs to.
     */
    virtual EGLDisplay getEGLDisplay() const = 0;

    /**
     * Returns the EGLStream backing the stream.
     */
    virtual EGLStreamKHR getEGLStream() const = 0;

protected:
    ~IEGLOutputStream() {}
};

} // namespace Argus

#endif // _ARGUS_EGL_STREAM_H