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https://git.libcamera.org/libcamera/libcamera.git
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e3393f147e
Fetch the format and size of the libcamera::StreamConfiguration associated with a CameraStream by accessing the configuration by index. This removes the need to store the libcamera stream format and sizes as class members and avoid duplicating information that might get out of sync. It also allows to remove the StreamConfiguration from the constructor parameters list, as it can be identified by its index. While at it, re-order the constructor parameters order. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2020, Google Inc.
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*
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* camera_stream.h - Camera HAL stream
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*/
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#ifndef __ANDROID_CAMERA_STREAM_H__
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#define __ANDROID_CAMERA_STREAM_H__
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#include <memory>
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#include <hardware/camera3.h>
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#include <libcamera/buffer.h>
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#include <libcamera/camera.h>
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#include <libcamera/geometry.h>
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#include <libcamera/pixel_format.h>
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class Encoder;
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class CameraDevice;
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class CameraMetadata;
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class MappedCamera3Buffer;
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class CameraStream
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{
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public:
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/*
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* Enumeration of CameraStream types.
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*
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* A camera stream associates an Android stream to a libcamera stream.
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* This enumeration describes how the two streams are associated and how
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* and where data produced from libcamera are delivered to the
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* Android framework.
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*
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* Direct:
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*
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* The Android stream is directly mapped onto a libcamera stream: frames
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* are delivered by the library directly in the memory location
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* specified by the Android stream (buffer_handle_t->data) and provided
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* to the framework as they are. The Android stream characteristics are
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* directly translated to the libcamera stream configuration.
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*
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* +-----+ +-----+
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* | A | | L |
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* +-----+ +-----+
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* | |
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* V V
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* +-----+ +------+
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* | B |<---------------| FB |
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* +-----+ +------+
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*
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*
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* Internal:
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*
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* Data for the Android stream is produced by processing a libcamera
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* stream created by the HAL for that purpose. The libcamera stream
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* needs to be supplied with intermediate buffers where the library
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* delivers frames to be processed and then provided to the framework.
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* The libcamera stream configuration is not a direct translation of the
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* Android stream characteristics, but it describes the format and size
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* required for the processing procedure to produce frames in the
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* Android required format.
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*
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* +-----+ +-----+
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* | A | | L |
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* +-----+ +-----+
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* | |
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* V V
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* +-----+ +------+
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* | B | | FB |
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* +-----+ +------+
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* ^ |
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* |-------Processing------|
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*
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*
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* Mapped:
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*
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* Data for the Android stream is produced by processing a libcamera
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* stream associated with another CameraStream. Mapped camera streams do
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* not need any memory to be reserved for them as they process data
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* produced by libcamera for a different stream whose format and size
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* are compatible with the processing procedure requirements to produce
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* frames in the Android required format.
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*
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* +-----+ +-----+ +-----+
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* | A | | A' | | L |
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* +-----+ +-----+ +-----+
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* | | |
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* V V V
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* +-----+ +-----+ +------+
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* | B | | B' |<---------| FB |
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* +-----+ +-----+ +------+
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* ^ |
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* |--Processing--|
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*
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*
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* --------------------------------------------------------------------
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* A = Android stream
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* L = libcamera stream
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* B = memory buffer
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* FB = libcamera FrameBuffer
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* "Processing" = Frame processing procedure (Encoding, scaling etc)
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*/
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enum class Type {
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Direct,
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Internal,
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Mapped,
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};
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CameraStream(CameraDevice *cameraDevice, Type type,
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camera3_stream_t *camera3Stream, unsigned int index);
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Type type() const { return type_; }
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const camera3_stream_t &camera3Stream() const { return *camera3Stream_; }
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const libcamera::StreamConfiguration &configuration() const;
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libcamera::Stream *stream() const;
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int configure(const libcamera::StreamConfiguration &cfg);
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int process(const libcamera::FrameBuffer &source,
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MappedCamera3Buffer *dest, CameraMetadata *metadata);
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private:
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CameraDevice *cameraDevice_;
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libcamera::CameraConfiguration *config_;
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Type type_;
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camera3_stream_t *camera3Stream_;
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/*
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* The index of the libcamera StreamConfiguration as added during
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* configureStreams(). A single libcamera Stream may be used to deliver
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* one or more streams to the Android framework.
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*/
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unsigned int index_;
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std::unique_ptr<Encoder> encoder_;
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};
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#endif /* __ANDROID_CAMERA_STREAM__ */
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