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android: Introduce CameraBuffer interface

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In order to provide support for different memory backends,
move the MappedCamera3Buffer class definition outside of the
CameraDevice class to its own file and rename it in CameraBuffer.

The interface defined in camera_buffer.h will be implemented by
different backends that will be placed in the src/android/mm
subdirectory.

Provide a first implementation for the 'generic android' backend
which matches the existing one.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Jacopo Mondi 2021-02-17 16:04:34 +01:00
parent ad9eee2a7d
commit 64c17f73a0
6 changed files with 79 additions and 38 deletions
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47
src/android/mm/generic_camera_buffer.cpp Normal file
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* generic_camera_buffer.cpp - Generic Android frame buffer backend
*/
#include "../camera_buffer.h"
#include "libcamera/internal/log.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(HAL)
CameraBuffer::CameraBuffer(const buffer_handle_t camera3buffer, int flags)
{
maps_.reserve(camera3buffer->numFds);
error_ = 0;
for (int i = 0; i < camera3buffer->numFds; i++) {
if (camera3buffer->data[i] == -1)
continue;
off_t length = lseek(camera3buffer->data[i], 0, SEEK_END);
if (length < 0) {
error_ = -errno;
LOG(HAL, Error) << "Failed to query plane length";
break;
}
void *address = mmap(nullptr, length, flags, MAP_SHARED,
camera3buffer->data[i], 0);
if (address == MAP_FAILED) {
error_ = -errno;
LOG(HAL, Error) << "Failed to mmap plane";
break;
}
maps_.emplace_back(static_cast<uint8_t *>(address),
static_cast<size_t>(length));
}
}
CameraBuffer::~CameraBuffer()
{
}