libcamera/vivid.git - libcamera pipeline handler for VIVID

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019-2021, Google Inc.
 *
 * camera_request.cpp - libcamera Android Camera Request Descriptor
 */

#include "camera_request.h"

#include <libcamera/base/span.h>

#include "camera_buffer.h"

using namespace libcamera;

/*
 * \class Camera3RequestDescriptor
 *
 * A utility class that groups information about a capture request to be later
 * reused at request complete time to notify the framework.
 *
 *******************************************************************************
 * Lifetime of a Camera3RequestDescriptor tracking a capture request placed by
 * Android Framework
 *******************************************************************************
 *
 *
 *  Android Framework
 *     │
 *     │    ┌──────────────────────────────────┐
 *     │    │camera3_capture_request_t         │
 *     │    │                                  │
 *     │    │Requested output streams          │
 *     │    │  stream1   stream2   stream3 ... │
 *     │    └──────────────────────────────────┘
 *     ▼
 * ┌─────────────────────────────────────────────────────────────┐
 * │ libcamera HAL                                               │
 * ├─────────────────────────────────────────────────────────────┤
 * │  CameraDevice                                               │
 * │                                                             │
 * │  processCaptureRequest(camera3_capture_request_t request)   │
 * │                                                             │
 * │   - Create Camera3RequestDescriptor tracking this request   │
 * │   - Streams requiring post-processing are stored in the     │
 * │     pendingStreamsToProcess map                             │
 * │   - Add this Camera3RequestDescriptor to descriptors' queue │
 * │     CameraDevice::descriptors_                              │
 * │                                                             │ ┌─────────────────────────┐
 * │   - Queue the capture request to libcamera core ────────────┤►│libcamera core           │
 * │                                                             │ ├─────────────────────────┤
 * │                                                             │ │- Capture from Camera    │
 * │                                                             │ │                         │
 * │                                                             │ │- Emit                   │
 * │                                                             │ │  Camera::requestComplete│
 * │  requestCompleted(Request *request) ◄───────────────────────┼─┼────                     │
 * │                                                             │ │                         │
 * │   - Check request completion status                         │ └─────────────────────────┘
 * │                                                             │
 * │   - if (pendingStreamsToProcess > 0)                        │
 * │      Queue all entries from pendingStreamsToProcess         │
 * │    else                                   │                 │
 * │      completeDescriptor()                 │                 └──────────────────────┐
 * │                                           │                                        │
 * │                ┌──────────────────────────┴───┬──────────────────┐                 │
 * │                │                              │                  │                 │
 * │     ┌──────────▼────────────┐     ┌───────────▼─────────┐        ▼                 │
 * │     │CameraStream1          │     │CameraStream2        │      ....                │
 * │     ├┬───┬───┬──────────────┤     ├┬───┬───┬────────────┤                          │
 * │     ││   │   │              │     ││   │   │            │                          │
 * │     │▼───▼───▼──────────────┤     │▼───▼───▼────────────┤                          │
 * │     │PostProcessorWorker    │     │PostProcessorWorker  │                          │
 * │     │                       │     │                     │                          │
 * │     │ +------------------+  │     │ +------------------+│                          │
 * │     │ | PostProcessor    |  │     │ | PostProcessor    |│                          │
 * │     │ |     process()    |  │     │ |     process()    |│                          │
 * │     │ |                  |  │     │ |                  |│                          │
 * │     │ | Emit             |  │     │ | Emit             |│                          │
 * │     │ | processComplete  |  │     │ | processComplete  |│                          │
 * │     │ |                  |  │     │ |                  |│                          │
 * │     │ +--------------│---+  │     │ +--------------│---+│                          │
 * │     │                │      │     │                │    │                          │
 * │     │                │      │     │                │    │                          │
 * │     └────────────────┼──────┘     └────────────────┼────┘                          │
 * │                      │                             │                               │
 * │                      │                             │                               │
 * │                      │                             │                               │
 * │                      ▼                             ▼                               │
 * │ +---------------------------------------+     +--------------+                     │
 * │ | CameraDevice                          |     |              |                     │
 * │ |                                       |     |              |                     │
 * │ | streamProcessingComplete()            |     |              |                     │
 * │ |                                       |     |              |                     │
 * │ | - Check and set buffer status         |     |     ....     |                     │
 * │ | - Remove post+processing entry        |     |              |                     │
 * │ |   from pendingStreamsToProcess        |     |              |                     │
 * │ |                                       |     |              |                     │
 * │ | - if (pendingStreamsToProcess.empty())|     |              |                     │
 * │ |        completeDescriptor             |     |              |                     │
 * │ |                                       |     |              |                     │

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