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v4l2: v4l2_compat: Add V4L2 compatibility layer

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Add libcamera V4L2 compatibility layer.

This initial implementation supports the minimal set of V4L2 operations,
which allows getting, setting, and enumerating formats, and streaming
frames from a video device. Some data about the wrapped V4L2 video
device are hardcoded.

Add a build option named 'v4l2' and adjust the build system to
selectively compile the V4L2 compatibility layer.

For now we match the V4L2 device node to a libcamera camera based on a
devnum that a pipeline handler may optionally map to a libcamera
camera.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Paul Elder 2019-12-06 04:14:52 -05:00
parent a3b80f3af8
commit 0ce8f2390b
10 changed files with 1486 additions and 0 deletions
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5
meson_options.txt
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@ -10,3 +10,8 @@ option('documentation',
option('test', option('test',
type : 'boolean', type : 'boolean',
description: 'Compile and include the tests') description: 'Compile and include the tests')
option('v4l2',
type : 'boolean',
value : false,
description : 'Compile the V4L2 compatibility layer')

4
src/meson.build
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@ -6,3 +6,7 @@ subdir('libcamera')
subdir('ipa') subdir('ipa')
subdir('cam') subdir('cam')
subdir('qcam') subdir('qcam')
if get_option('v4l2')
subdir('v4l2')
endif

31
src/v4l2/meson.build Normal file
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@ -0,0 +1,31 @@
v4l2_compat_sources = files([
'v4l2_camera.cpp',
'v4l2_camera_proxy.cpp',
'v4l2_compat.cpp',
'v4l2_compat_manager.cpp',
])
v4l2_compat_includes = [
libcamera_includes,
libcamera_internal_includes,
]
v4l2_compat_cpp_args = [
# Meson enables large file support unconditionally, which redirect file
# operations to 64-bit versions. This results in some symbols being
# renamed, for instance open() being renamed to open64(). As the V4L2
# adaptation wrapper needs to provide both 32-bit and 64-bit versions of
# file operations, disable transparent large file support.
'-U_FILE_OFFSET_BITS',
'-D_FILE_OFFSET_BITS=32',
'-fvisibility=hidden',
]
v4l2_compat = shared_library('v4l2-compat',
v4l2_compat_sources,
name_prefix : '',
install : true,
link_with : libcamera,
include_directories : v4l2_compat_includes,
dependencies : libcamera_deps,
cpp_args : v4l2_compat_cpp_args)

224
src/v4l2/v4l2_camera.cpp Normal file
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@ -0,0 +1,224 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera.cpp - V4L2 compatibility camera
*/
#include "v4l2_camera.h"
#include <errno.h>
#include "log.h"
#include "utils.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(V4L2Compat);
FrameMetadata::FrameMetadata(Buffer *buffer)
: index_(buffer->index()), bytesused_(buffer->bytesused()),
timestamp_(buffer->timestamp()), sequence_(buffer->sequence()),
status_(buffer->status())
{
}
V4L2Camera::V4L2Camera(std::shared_ptr<Camera> camera)
: camera_(camera), isRunning_(false)
{
camera_->requestCompleted.connect(this, &V4L2Camera::requestComplete);
}
V4L2Camera::~V4L2Camera()
{
camera_->release();
}
void V4L2Camera::open(int *ret)
{
/* \todo Support multiple open. */
if (camera_->acquire() < 0) {
LOG(V4L2Compat, Error) << "Failed to acquire camera";
*ret = -EINVAL;
return;
}
config_ = camera_->generateConfiguration({ StreamRole::Viewfinder });
if (!config_) {
camera_->release();
*ret = -EINVAL;
return;
}
*ret = 0;
}
void V4L2Camera::close()
{
camera_->release();
}
void V4L2Camera::getStreamConfig(StreamConfiguration *streamConfig)
{
*streamConfig = config_->at(0);
}
std::vector<FrameMetadata> V4L2Camera::completedBuffers()
{
std::vector<FrameMetadata> v;
bufferLock_.lock();
for (std::unique_ptr<FrameMetadata> &metadata : completedBuffers_)
v.push_back(*metadata.get());
completedBuffers_.clear();
bufferLock_.unlock();
return v;
}
void V4L2Camera::requestComplete(Request *request)
{
if (request->status() == Request::RequestCancelled)
return;
/* We only have one stream at the moment. */
bufferLock_.lock();
Buffer *buffer = request->buffers().begin()->second;
std::unique_ptr<FrameMetadata> metadata =
utils::make_unique<FrameMetadata>(buffer);
completedBuffers_.push_back(std::move(metadata));
bufferLock_.unlock();
bufferSema_.release();
}
void V4L2Camera::configure(int *ret, StreamConfiguration *streamConfigOut,
const Size &size, PixelFormat pixelformat,
unsigned int bufferCount)
{
StreamConfiguration &streamConfig = config_->at(0);
streamConfig.size.width = size.width;
streamConfig.size.height = size.height;
streamConfig.pixelFormat = pixelformat;
streamConfig.bufferCount = bufferCount;
/* \todo memoryType (interval vs external) */
CameraConfiguration::Status validation = config_->validate();
if (validation == CameraConfiguration::Invalid) {
LOG(V4L2Compat, Debug) << "Configuration invalid";
*ret = -EINVAL;
return;
}
if (validation == CameraConfiguration::Adjusted)
LOG(V4L2Compat, Debug) << "Configuration adjusted";
LOG(V4L2Compat, Debug) << "Validated configuration is: "
<< streamConfig.toString();
*ret = camera_->configure(config_.get());
if (*ret < 0)
return;
*streamConfigOut = config_->at(0);
}
void V4L2Camera::mmap(void **ret, unsigned int index)
{
Stream *stream = *camera_->streams().begin();
*ret = stream->buffers()[index].planes()[0].mem();
}
void V4L2Camera::allocBuffers(int *ret, unsigned int count)
{
*ret = camera_->allocateBuffers();
if (*ret == -EACCES)
*ret = -EBUSY;
}
void V4L2Camera::freeBuffers()
{
camera_->freeBuffers();
}
void V4L2Camera::streamOn(int *ret)
{
*ret = 0;
if (isRunning_)
return;
*ret = camera_->start();
if (*ret < 0) {
if (*ret == -EACCES)
*ret = -EBUSY;
return;
}
isRunning_ = true;
for (std::unique_ptr<Request> &req : pendingRequests_) {
/* \todo What should we do if this returns -EINVAL? */
*ret = camera_->queueRequest(req.release());
if (*ret < 0) {
if (*ret == -EACCES)
*ret = -EBUSY;
return;
}
}
pendingRequests_.clear();
}
void V4L2Camera::streamOff(int *ret)
{
*ret = 0;
/* \todo Restore buffers to reqbufs state? */
if (!isRunning_)
return;
*ret = camera_->stop();
if (*ret < 0) {
if (*ret == -EACCES)
*ret = -EBUSY;
return;
}
isRunning_ = false;
}
void V4L2Camera::qbuf(int *ret, unsigned int index)
{
Stream *stream = config_->at(0).stream();
std::unique_ptr<Buffer> buffer = stream->createBuffer(index);
if (!buffer) {
LOG(V4L2Compat, Error) << "Can't create buffer";
*ret = -ENOMEM;
return;
}
std::unique_ptr<Request> request =
std::unique_ptr<Request>(camera_->createRequest());
if (!request) {
LOG(V4L2Compat, Error) << "Can't create request";
*ret = -ENOMEM;
return;
}
*ret = request->addBuffer(std::move(buffer));
if (*ret < 0) {
LOG(V4L2Compat, Error) << "Can't set buffer for request";
*ret = -ENOMEM;
return;
}
if (!isRunning_) {
pendingRequests_.push_back(std::move(request));
return;
}
*ret = camera_->queueRequest(request.release());
if (*ret < 0) {
LOG(V4L2Compat, Error) << "Can't queue request";
if (*ret == -EACCES)
*ret = -EBUSY;
}
}

85
src/v4l2/v4l2_camera.h Normal file
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@ -0,0 +1,85 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera.h - V4L2 compatibility camera
*/
#ifndef __V4L2_CAMERA_H__
#define __V4L2_CAMERA_H__
#include <deque>
#include <linux/videodev2.h>
#include <mutex>
#include <libcamera/buffer.h>
#include <libcamera/camera.h>
#include "semaphore.h"
using namespace libcamera;
class FrameMetadata
{
public:
FrameMetadata(Buffer *buffer);
int index() const { return index_; }
unsigned int bytesused() const { return bytesused_; }
uint64_t timestamp() const { return timestamp_; }
unsigned int sequence() const { return sequence_; }
Buffer::Status status() const { return status_; }
private:
int index_;
unsigned int bytesused_;
uint64_t timestamp_;
unsigned int sequence_;
Buffer::Status status_;
};
class V4L2Camera : public Object
{
public:
V4L2Camera(std::shared_ptr<Camera> camera);
~V4L2Camera();
void open(int *ret);
void close();
void getStreamConfig(StreamConfiguration *streamConfig);
std::vector<FrameMetadata> completedBuffers();
void mmap(void **ret, unsigned int index);
void configure(int *ret, StreamConfiguration *streamConfigOut,
const Size &size, PixelFormat pixelformat,
unsigned int bufferCount);
void allocBuffers(int *ret, unsigned int count);
void freeBuffers();
void streamOn(int *ret);
void streamOff(int *ret);
void qbuf(int *ret, unsigned int index);
Semaphore bufferSema_;
private:
void requestComplete(Request *request);
std::shared_ptr<Camera> camera_;
std::unique_ptr<CameraConfiguration> config_;
bool isRunning_;
std::mutex bufferLock_;
std::deque<std::unique_ptr<Request>> pendingRequests_;
std::deque<std::unique_ptr<FrameMetadata>> completedBuffers_;
};
#endif /* __V4L2_CAMERA_H__ */

644
src/v4l2/v4l2_camera_proxy.cpp Normal file
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@ -0,0 +1,644 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera_proxy.cpp - Proxy to V4L2 compatibility camera
*/
#include "v4l2_camera_proxy.h"
#include <algorithm>
#include <errno.h>
#include <linux/drm_fourcc.h>
#include <linux/videodev2.h>
#include <string.h>
#include <sys/mman.h>
#include <libcamera/camera.h>
#include <libcamera/object.h>
#include "log.h"
#include "utils.h"
#include "v4l2_camera.h"
#include "v4l2_compat_manager.h"
#define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
using namespace libcamera;
LOG_DECLARE_CATEGORY(V4L2Compat);
V4L2CameraProxy::V4L2CameraProxy(unsigned int index,
std::shared_ptr<Camera> camera)
: refcount_(0), index_(index), bufferCount_(0), currentBuf_(0),
vcam_(utils::make_unique<V4L2Camera>(camera))
{
querycap(camera);
}
int V4L2CameraProxy::open(bool nonBlocking)
{
LOG(V4L2Compat, Debug) << "Servicing open";
int ret;
vcam_->invokeMethod(&V4L2Camera::open, ConnectionTypeBlocking,
&ret);
if (ret < 0) {
errno = -ret;
return -1;
}
nonBlocking_ = nonBlocking;
vcam_->invokeMethod(&V4L2Camera::getStreamConfig,
ConnectionTypeBlocking, &streamConfig_);
setFmtFromConfig(streamConfig_);
sizeimage_ = calculateSizeImage(streamConfig_);
refcount_++;
return 0;
}
void V4L2CameraProxy::dup()
{
refcount_++;
}
void V4L2CameraProxy::close()
{
LOG(V4L2Compat, Debug) << "Servicing close";
if (--refcount_ > 0)
return;
vcam_->invokeMethod(&V4L2Camera::close, ConnectionTypeBlocking);
}
void *V4L2CameraProxy::mmap(size_t length, int prot, int flags, off_t offset)
{
LOG(V4L2Compat, Debug) << "Servicing mmap";
/* \todo Validate prot and flags properly. */
if (prot != (PROT_READ | PROT_WRITE)) {
errno = EINVAL;
return MAP_FAILED;
}
unsigned int index = offset / sizeimage_;
if (index * sizeimage_ != offset || length != sizeimage_) {
errno = EINVAL;
return MAP_FAILED;
}
void *val;
vcam_->invokeMethod(&V4L2Camera::mmap, ConnectionTypeBlocking,
&val, index);
buffers_[index].flags |= V4L2_BUF_FLAG_MAPPED;
mmaps_[val] = index;
return val;
}
int V4L2CameraProxy::munmap(void *addr, size_t length)
{
LOG(V4L2Compat, Debug) << "Servicing munmap";
auto iter = mmaps_.find(addr);
if (iter == mmaps_.end() || length != sizeimage_) {
errno = EINVAL;
return -1;
}
buffers_[iter->second].flags &= ~V4L2_BUF_FLAG_MAPPED;
mmaps_.erase(iter);
return 0;
}
bool V4L2CameraProxy::validateBufferType(uint32_t type)
{
return type == V4L2_BUF_TYPE_VIDEO_CAPTURE;
}
bool V4L2CameraProxy::validateMemoryType(uint32_t memory)
{
return memory == V4L2_MEMORY_MMAP;
}
void V4L2CameraProxy::setFmtFromConfig(StreamConfiguration &streamConfig)
{
curV4L2Format_.fmt.pix.width = streamConfig.size.width;
curV4L2Format_.fmt.pix.height = streamConfig.size.height;
curV4L2Format_.fmt.pix.pixelformat = drmToV4L2(streamConfig.pixelFormat);
curV4L2Format_.fmt.pix.field = V4L2_FIELD_NONE;
curV4L2Format_.fmt.pix.bytesperline =
bplMultiplier(curV4L2Format_.fmt.pix.pixelformat) *
curV4L2Format_.fmt.pix.width;
curV4L2Format_.fmt.pix.sizeimage =
imageSize(curV4L2Format_.fmt.pix.pixelformat,
curV4L2Format_.fmt.pix.width,
curV4L2Format_.fmt.pix.height);
curV4L2Format_.fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
}
unsigned int V4L2CameraProxy::calculateSizeImage(StreamConfiguration &streamConfig)
{
/*
* \todo Merge this method with setFmtFromConfig (need imageSize to
* support all libcamera formats first, or filter out MJPEG for now).
*/
return imageSize(drmToV4L2(streamConfig.pixelFormat),
streamConfig.size.width,
streamConfig.size.height);
}
void V4L2CameraProxy::querycap(std::shared_ptr<Camera> camera)
{
std::string driver = "libcamera";
std::string bus_info = driver + ":" + std::to_string(index_);
utils::strlcpy(reinterpret_cast<char *>(capabilities_.driver), driver.c_str(),
sizeof(capabilities_.driver));
utils::strlcpy(reinterpret_cast<char *>(capabilities_.card), camera->name().c_str(),
sizeof(capabilities_.card));
utils::strlcpy(reinterpret_cast<char *>(capabilities_.bus_info), bus_info.c_str(),
sizeof(capabilities_.bus_info));
/* \todo Put this in a header/config somewhere. */
capabilities_.version = KERNEL_VERSION(5, 2, 0);
capabilities_.device_caps = V4L2_CAP_VIDEO_CAPTURE;
capabilities_.capabilities = capabilities_.device_caps
| V4L2_CAP_DEVICE_CAPS;
memset(capabilities_.reserved, 0, sizeof(capabilities_.reserved));
}
void V4L2CameraProxy::updateBuffers()
{
std::vector<FrameMetadata> completedBuffers = vcam_->completedBuffers();
for (FrameMetadata &fmd : completedBuffers) {
struct v4l2_buffer &buf = buffers_[fmd.index()];
switch (fmd.status()) {
case Buffer::Status::BufferSuccess:
buf.bytesused = fmd.bytesused();
buf.field = V4L2_FIELD_NONE;
buf.timestamp.tv_sec = fmd.timestamp() / 1000000000;
buf.timestamp.tv_usec = fmd.timestamp() % 1000000;
buf.sequence = fmd.sequence();
buf.flags |= V4L2_BUF_FLAG_DONE;
break;
case Buffer::Status::BufferError:
buf.flags |= V4L2_BUF_FLAG_ERROR;
break;
default:
break;
}
}
}
int V4L2CameraProxy::vidioc_querycap(struct v4l2_capability *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_querycap";
*arg = capabilities_;
return 0;
}
int V4L2CameraProxy::vidioc_enum_fmt(struct v4l2_fmtdesc *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_enum_fmt";
if (!validateBufferType(arg->type) ||
arg->index > streamConfig_.formats().pixelformats().size())
return -EINVAL;
/* \todo Add map from format to description. */
utils::strlcpy(reinterpret_cast<char *>(arg->description), "Video Format Description",
sizeof(arg->description));
arg->pixelformat = drmToV4L2(streamConfig_.formats().pixelformats()[arg->index]);
return 0;
}
int V4L2CameraProxy::vidioc_g_fmt(struct v4l2_format *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_g_fmt";
if (!validateBufferType(arg->type))
return -EINVAL;
memset(&arg->fmt, 0, sizeof(arg->fmt));
arg->fmt.pix = curV4L2Format_.fmt.pix;
return 0;
}
int V4L2CameraProxy::vidioc_s_fmt(struct v4l2_format *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_s_fmt";
int ret = vidioc_try_fmt(arg);
if (ret < 0)
return ret;
Size size(arg->fmt.pix.width, arg->fmt.pix.height);
vcam_->invokeMethod(&V4L2Camera::configure, ConnectionTypeBlocking,
&ret, &streamConfig_, size,
v4l2ToDrm(arg->fmt.pix.pixelformat), bufferCount_);
if (ret < 0)
return -EINVAL;
unsigned int sizeimage = calculateSizeImage(streamConfig_);
if (sizeimage == 0)
return -EINVAL;
sizeimage_ = sizeimage;
setFmtFromConfig(streamConfig_);
return 0;
}
int V4L2CameraProxy::vidioc_try_fmt(struct v4l2_format *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_try_fmt";
if (!validateBufferType(arg->type))
return -EINVAL;
PixelFormat format = v4l2ToDrm(arg->fmt.pix.pixelformat);
const std::vector<PixelFormat> &formats =
streamConfig_.formats().pixelformats();
if (std::find(formats.begin(), formats.end(), format) == formats.end())
format = streamConfig_.formats().pixelformats()[0];
Size size(arg->fmt.pix.width, arg->fmt.pix.height);
const std::vector<Size> &sizes = streamConfig_.formats().sizes(format);
if (std::find(sizes.begin(), sizes.end(), size) == sizes.end())
size = streamConfig_.formats().sizes(format)[0];
arg->fmt.pix.width = size.width;
arg->fmt.pix.height = size.height;
arg->fmt.pix.pixelformat = v4l2ToDrm(format);
arg->fmt.pix.field = V4L2_FIELD_NONE;
arg->fmt.pix.bytesperline = bplMultiplier(drmToV4L2(format)) *
arg->fmt.pix.width;
arg->fmt.pix.sizeimage = imageSize(drmToV4L2(format),
arg->fmt.pix.width,
arg->fmt.pix.height);
arg->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
return 0;
}
int V4L2CameraProxy::freeBuffers()
{
LOG(V4L2Compat, Debug) << "Freeing libcamera bufs";
int ret;
vcam_->invokeMethod(&V4L2Camera::streamOff,
ConnectionTypeBlocking, &ret);
if (ret < 0) {
LOG(V4L2Compat, Error) << "Failed to stop stream";
return ret;
}
vcam_->invokeMethod(&V4L2Camera::freeBuffers, ConnectionTypeBlocking);
bufferCount_ = 0;
return 0;
}
int V4L2CameraProxy::vidioc_reqbufs(struct v4l2_requestbuffers *arg)
{
int ret;
LOG(V4L2Compat, Debug) << "Servicing vidioc_reqbufs";
if (!validateBufferType(arg->type) ||
!validateMemoryType(arg->memory))
return -EINVAL;
LOG(V4L2Compat, Debug) << arg->count << " buffers requested ";
arg->capabilities = V4L2_BUF_CAP_SUPPORTS_MMAP;
if (arg->count == 0)
return freeBuffers();
Size size(curV4L2Format_.fmt.pix.width, curV4L2Format_.fmt.pix.height);
vcam_->invokeMethod(&V4L2Camera::configure, ConnectionTypeBlocking,
&ret, &streamConfig_, size,
v4l2ToDrm(curV4L2Format_.fmt.pix.pixelformat),
arg->count);
if (ret < 0)
return -EINVAL;
sizeimage_ = calculateSizeImage(streamConfig_);
if (sizeimage_ == 0)
return -EINVAL;
setFmtFromConfig(streamConfig_);
arg->count = streamConfig_.bufferCount;
bufferCount_ = arg->count;
vcam_->invokeMethod(&V4L2Camera::allocBuffers,
ConnectionTypeBlocking, &ret, arg->count);
if (ret < 0) {
arg->count = 0;
return ret;
}
buffers_.resize(arg->count);
for (unsigned int i = 0; i < arg->count; i++) {
struct v4l2_buffer buf = {};
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.length = curV4L2Format_.fmt.pix.sizeimage;
buf.memory = V4L2_MEMORY_MMAP;
buf.m.offset = i * curV4L2Format_.fmt.pix.sizeimage;
buf.index = i;
buffers_[i] = buf;
}
LOG(V4L2Compat, Debug) << "Allocated " << arg->count << " buffers";
return 0;
}
int V4L2CameraProxy::vidioc_querybuf(struct v4l2_buffer *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_querybuf";
if (!validateBufferType(arg->type) ||
arg->index >= bufferCount_)
return -EINVAL;
updateBuffers();
*arg = buffers_[arg->index];
return 0;
}
int V4L2CameraProxy::vidioc_qbuf(struct v4l2_buffer *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_qbuf, index = "
<< arg->index;
if (!validateBufferType(arg->type) ||
!validateMemoryType(arg->memory) ||
arg->index >= bufferCount_)
return -EINVAL;
int ret;
vcam_->invokeMethod(&V4L2Camera::qbuf, ConnectionTypeBlocking,
&ret, arg->index);
if (ret < 0)
return ret;
arg->flags |= V4L2_BUF_FLAG_QUEUED;
arg->flags &= ~V4L2_BUF_FLAG_DONE;
return ret;
}
int V4L2CameraProxy::vidioc_dqbuf(struct v4l2_buffer *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_dqbuf";
if (!validateBufferType(arg->type) ||
!validateMemoryType(arg->memory))
return -EINVAL;
if (nonBlocking_ && !vcam_->bufferSema_.tryAcquire())
return -EAGAIN;
else
vcam_->bufferSema_.acquire();
updateBuffers();
struct v4l2_buffer &buf = buffers_[currentBuf_];
buf.flags &= ~V4L2_BUF_FLAG_QUEUED;
buf.length = sizeimage_;
*arg = buf;
currentBuf_ = (currentBuf_ + 1) % bufferCount_;
return 0;
}
int V4L2CameraProxy::vidioc_streamon(int *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_streamon";
if (!validateBufferType(*arg))
return -EINVAL;
int ret;
vcam_->invokeMethod(&V4L2Camera::streamOn,
ConnectionTypeBlocking, &ret);
return ret;
}
int V4L2CameraProxy::vidioc_streamoff(int *arg)
{
LOG(V4L2Compat, Debug) << "Servicing vidioc_streamoff";
if (!validateBufferType(*arg))
return -EINVAL;
int ret;
vcam_->invokeMethod(&V4L2Camera::streamOff,
ConnectionTypeBlocking, &ret);
for (struct v4l2_buffer &buf : buffers_)
buf.flags &= ~(V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE);
return ret;
}
int V4L2CameraProxy::ioctl(unsigned long request, void *arg)
{
int ret;
switch (request) {
case VIDIOC_QUERYCAP:
ret = vidioc_querycap(static_cast<struct v4l2_capability *>(arg));
break;
case VIDIOC_ENUM_FMT:
ret = vidioc_enum_fmt(static_cast<struct v4l2_fmtdesc *>(arg));
break;
case VIDIOC_G_FMT:
ret = vidioc_g_fmt(static_cast<struct v4l2_format *>(arg));
break;
case VIDIOC_S_FMT:
ret = vidioc_s_fmt(static_cast<struct v4l2_format *>(arg));
break;
case VIDIOC_TRY_FMT:
ret = vidioc_try_fmt(static_cast<struct v4l2_format *>(arg));
break;
case VIDIOC_REQBUFS:
ret = vidioc_reqbufs(static_cast<struct v4l2_requestbuffers *>(arg));
break;
case VIDIOC_QUERYBUF:
ret = vidioc_querybuf(static_cast<struct v4l2_buffer *>(arg));
break;
case VIDIOC_QBUF:
ret = vidioc_qbuf(static_cast<struct v4l2_buffer *>(arg));
break;
case VIDIOC_DQBUF:
ret = vidioc_dqbuf(static_cast<struct v4l2_buffer *>(arg));
break;
case VIDIOC_STREAMON:
ret = vidioc_streamon(static_cast<int *>(arg));
break;
case VIDIOC_STREAMOFF:
ret = vidioc_streamoff(static_cast<int *>(arg));
break;
default:
ret = -ENOTTY;
break;
}
if (ret < 0) {
errno = -ret;
return -1;
}
return ret;
}
/* \todo make libcamera export these */
int V4L2CameraProxy::bplMultiplier(unsigned int format)
{
switch (format) {
case V4L2_PIX_FMT_NV12:
case V4L2_PIX_FMT_NV21:
case V4L2_PIX_FMT_NV16:
case V4L2_PIX_FMT_NV61:
case V4L2_PIX_FMT_NV24:
case V4L2_PIX_FMT_NV42:
return 1;
case V4L2_PIX_FMT_BGR24:
case V4L2_PIX_FMT_RGB24:
return 3;
case V4L2_PIX_FMT_ARGB32:
return 4;
case V4L2_PIX_FMT_VYUY:
case V4L2_PIX_FMT_YVYU:
case V4L2_PIX_FMT_UYVY:
case V4L2_PIX_FMT_YUYV:
return 2;
default:
return 0;
};
}
int V4L2CameraProxy::imageSize(unsigned int format,
unsigned int width, unsigned int height)
{
switch (format) {
case V4L2_PIX_FMT_NV12:
case V4L2_PIX_FMT_NV21:
return width * height * 3 / 2;
case V4L2_PIX_FMT_NV16:
case V4L2_PIX_FMT_NV61:
return width * height * 2;
case V4L2_PIX_FMT_NV24:
case V4L2_PIX_FMT_NV42:
return width * height * 3;
case V4L2_PIX_FMT_BGR24:
case V4L2_PIX_FMT_RGB24:
return width * height * 3;
case V4L2_PIX_FMT_ARGB32:
return width * height * 4;
case V4L2_PIX_FMT_VYUY:
case V4L2_PIX_FMT_YVYU:
case V4L2_PIX_FMT_UYVY:
case V4L2_PIX_FMT_YUYV:
return width * height * 2;
default:
return 0;
};
}
unsigned int V4L2CameraProxy::v4l2ToDrm(unsigned int pixelformat)
{
switch (pixelformat) {
/* RGB formats. */
case V4L2_PIX_FMT_RGB24:
return DRM_FORMAT_BGR888;
case V4L2_PIX_FMT_BGR24:
return DRM_FORMAT_RGB888;
case V4L2_PIX_FMT_ARGB32:
return DRM_FORMAT_BGRA8888;
/* YUV packed formats. */
case V4L2_PIX_FMT_YUYV:
return DRM_FORMAT_YUYV;
case V4L2_PIX_FMT_YVYU:
return DRM_FORMAT_YVYU;
case V4L2_PIX_FMT_UYVY:
return DRM_FORMAT_UYVY;
case V4L2_PIX_FMT_VYUY:
return DRM_FORMAT_VYUY;
/* YUY planar formats. */
case V4L2_PIX_FMT_NV16:
return DRM_FORMAT_NV16;
case V4L2_PIX_FMT_NV61:
return DRM_FORMAT_NV61;
case V4L2_PIX_FMT_NV12:
return DRM_FORMAT_NV12;
case V4L2_PIX_FMT_NV21:
return DRM_FORMAT_NV21;
case V4L2_PIX_FMT_NV24:
return DRM_FORMAT_NV24;
case V4L2_PIX_FMT_NV42:
return DRM_FORMAT_NV42;
default:
return pixelformat;
};
}
unsigned int V4L2CameraProxy::drmToV4L2(unsigned int pixelformat)
{
switch (pixelformat) {
/* RGB formats. */
case DRM_FORMAT_BGR888:
return V4L2_PIX_FMT_RGB24;
case DRM_FORMAT_RGB888:
return V4L2_PIX_FMT_BGR24;
case DRM_FORMAT_BGRA8888:
return V4L2_PIX_FMT_ARGB32;
/* YUV packed formats. */
case DRM_FORMAT_YUYV:
return V4L2_PIX_FMT_YUYV;
case DRM_FORMAT_YVYU:
return V4L2_PIX_FMT_YVYU;
case DRM_FORMAT_UYVY:
return V4L2_PIX_FMT_UYVY;
case DRM_FORMAT_VYUY:
return V4L2_PIX_FMT_VYUY;
/* YUY planar formats. */
case DRM_FORMAT_NV16:
return V4L2_PIX_FMT_NV16;
case DRM_FORMAT_NV61:
return V4L2_PIX_FMT_NV61;
case DRM_FORMAT_NV12:
return V4L2_PIX_FMT_NV12;
case DRM_FORMAT_NV21:
return V4L2_PIX_FMT_NV21;
case DRM_FORMAT_NV24:
return V4L2_PIX_FMT_NV24;
case DRM_FORMAT_NV42:
return V4L2_PIX_FMT_NV42;
default:
return pixelformat;
}
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_camera_proxy.h - Proxy to V4L2 compatibility camera
*/
#ifndef __V4L2_CAMERA_PROXY_H__
#define __V4L2_CAMERA_PROXY_H__
#include <linux/videodev2.h>
#include <map>
#include <memory>
#include <sys/types.h>
#include <vector>
#include <libcamera/camera.h>
#include "v4l2_camera.h"
using namespace libcamera;
class V4L2CameraProxy
{
public:
V4L2CameraProxy(unsigned int index, std::shared_ptr<Camera> camera);
int open(bool nonBlocking);
void dup();
void close();
void *mmap(size_t length, int prot, int flags, off_t offset);
int munmap(void *addr, size_t length);
int ioctl(unsigned long request, void *arg);
private:
bool validateBufferType(uint32_t type);
bool validateMemoryType(uint32_t memory);
void setFmtFromConfig(StreamConfiguration &streamConfig);
unsigned int calculateSizeImage(StreamConfiguration &streamConfig);
void querycap(std::shared_ptr<Camera> camera);
void updateBuffers();
int freeBuffers();
int vidioc_querycap(struct v4l2_capability *arg);
int vidioc_enum_fmt(struct v4l2_fmtdesc *arg);
int vidioc_g_fmt(struct v4l2_format *arg);
int vidioc_s_fmt(struct v4l2_format *arg);
int vidioc_try_fmt(struct v4l2_format *arg);
int vidioc_reqbufs(struct v4l2_requestbuffers *arg);
int vidioc_querybuf(struct v4l2_buffer *arg);
int vidioc_qbuf(struct v4l2_buffer *arg);
int vidioc_dqbuf(struct v4l2_buffer *arg);
int vidioc_streamon(int *arg);
int vidioc_streamoff(int *arg);
static int bplMultiplier(unsigned int format);
static int imageSize(unsigned int format, unsigned int width,
unsigned int height);
static unsigned int v4l2ToDrm(unsigned int pixelformat);
static unsigned int drmToV4L2(unsigned int pixelformat);
unsigned int refcount_;
unsigned int index_;
bool nonBlocking_;
struct v4l2_format curV4L2Format_;
StreamConfiguration streamConfig_;
struct v4l2_capability capabilities_;
unsigned int bufferCount_;
unsigned int currentBuf_;
unsigned int sizeimage_;
std::vector<struct v4l2_buffer> buffers_;
std::map<void *, unsigned int> mmaps_;
std::unique_ptr<V4L2Camera> vcam_;
};
#endif /* __V4L2_CAMERA_PROXY_H__ */

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_compat.cpp - V4L2 compatibility layer
*/
#include "v4l2_compat_manager.h"
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#define LIBCAMERA_PUBLIC __attribute__((visibility("default")))
using namespace libcamera;
#define extract_va_arg(type, arg, last) \
{ \
va_list ap; \
va_start(ap, last); \
arg = va_arg(ap, type); \
va_end(ap); \
}
extern "C" {
LIBCAMERA_PUBLIC int open(const char *path, int oflag, ...)
{
mode_t mode = 0;
if (oflag & O_CREAT || oflag & O_TMPFILE)
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(AT_FDCWD, path,
oflag, mode);
}
/* _FORTIFY_SOURCE redirects open to __open_2 */
LIBCAMERA_PUBLIC extern __typeof(open) __open_2 __attribute__ ((alias("open")));
LIBCAMERA_PUBLIC int openat(int dirfd, const char *path, int oflag, ...)
{
mode_t mode = 0;
if (oflag & O_CREAT || oflag & O_TMPFILE)
extract_va_arg(mode_t, mode, oflag);
return V4L2CompatManager::instance()->openat(dirfd, path, oflag, mode);
}
LIBCAMERA_PUBLIC extern __typeof(openat) __openat_2 __attribute__ ((alias("openat")));
LIBCAMERA_PUBLIC int dup(int oldfd)
{
return V4L2CompatManager::instance()->dup(oldfd);
}
LIBCAMERA_PUBLIC int close(int fd)
{
return V4L2CompatManager::instance()->close(fd);
}
LIBCAMERA_PUBLIC void *mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset)
{
return V4L2CompatManager::instance()->mmap(addr, length, prot, flags,
fd, offset);
}
LIBCAMERA_PUBLIC int munmap(void *addr, size_t length)
{
return V4L2CompatManager::instance()->munmap(addr, length);
}
LIBCAMERA_PUBLIC int ioctl(int fd, unsigned long request, ...)
{
void *arg;
extract_va_arg(void *, arg, request);
return V4L2CompatManager::instance()->ioctl(fd, request, arg);
}
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_compat_manager.cpp - V4L2 compatibility manager
*/
#include "v4l2_compat_manager.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <map>
#include <stdarg.h>
#include <string.h>
#include <sys/eventfd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <unistd.h>
#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>
#include "log.h"
using namespace libcamera;
LOG_DEFINE_CATEGORY(V4L2Compat)
V4L2CompatManager::V4L2CompatManager()
: cm_(nullptr), initialized_(false)
{
openat_func_ = (openat_func_t)dlsym(RTLD_NEXT, "openat");
dup_func_ = (dup_func_t )dlsym(RTLD_NEXT, "dup");
close_func_ = (close_func_t )dlsym(RTLD_NEXT, "close");
ioctl_func_ = (ioctl_func_t )dlsym(RTLD_NEXT, "ioctl");
mmap_func_ = (mmap_func_t )dlsym(RTLD_NEXT, "mmap");
munmap_func_ = (munmap_func_t)dlsym(RTLD_NEXT, "munmap");
}
V4L2CompatManager::~V4L2CompatManager()
{
devices_.clear();
mmaps_.clear();
if (isRunning()) {
exit(0);
/* \todo Wait with a timeout, just in case. */
wait();
}
}
int V4L2CompatManager::init()
{
start();
MutexLocker locker(mutex_);
cv_.wait(locker, [&] { return initialized_; });
return 0;
}
void V4L2CompatManager::run()
{
cm_ = new CameraManager();
int ret = cm_->start();
if (ret) {
LOG(V4L2Compat, Error) << "Failed to start camera manager: "
<< strerror(-ret);
return;
}
LOG(V4L2Compat, Debug) << "Started camera manager";
/*
* For each Camera registered in the system, a V4L2CameraProxy gets
* created here to wrap a camera device.
*/
unsigned int index = 0;
for (auto &camera : cm_->cameras()) {
V4L2CameraProxy *proxy = new V4L2CameraProxy(index, camera);
proxies_.emplace_back(proxy);
++index;
}
/*
* libcamera has been initialized. Unlock the init() caller as we're
* now ready to handle calls from the framework.
*/
mutex_.lock();
initialized_ = true;
mutex_.unlock();
cv_.notify_one();
/* Now start processing events and messages. */
exec();
proxies_.clear();
cm_->stop();
delete cm_;
cm_ = nullptr;
}
V4L2CompatManager *V4L2CompatManager::instance()
{
static V4L2CompatManager instance;
return &instance;
}
V4L2CameraProxy *V4L2CompatManager::getProxy(int fd)
{
auto device = devices_.find(fd);
if (device == devices_.end())
return nullptr;
return device->second;
}
int V4L2CompatManager::getCameraIndex(int fd)
{
struct stat statbuf;
int ret = fstat(fd, &statbuf);
if (ret < 0)
return -1;
std::shared_ptr<Camera> target = cm_->get(statbuf.st_rdev);
if (!target)
return -1;
unsigned int index = 0;
for (auto &camera : cm_->cameras()) {
if (camera == target)
return index;
++index;
}
return -1;
}
int V4L2CompatManager::openat(int dirfd, const char *path, int oflag, mode_t mode)
{
int fd = openat_func_(dirfd, path, oflag, mode);
if (fd < 0)
return fd;
struct stat statbuf;
int ret = fstat(fd, &statbuf);
if (ret < 0 || (statbuf.st_mode & S_IFMT) != S_IFCHR ||
major(statbuf.st_rdev) != 81)
return fd;
if (!isRunning())
init();
ret = getCameraIndex(fd);
if (ret < 0) {
LOG(V4L2Compat, Info) << "No camera found for " << path;
return fd;
}
close_func_(fd);
unsigned int camera_index = static_cast<unsigned int>(ret);
V4L2CameraProxy *proxy = proxies_[camera_index].get();
ret = proxy->open(oflag & O_NONBLOCK);
if (ret < 0)
return ret;
int efd = eventfd(0, oflag & (O_CLOEXEC | O_NONBLOCK));
if (efd < 0) {
proxy->close();
return efd;
}
devices_.emplace(efd, proxy);
return efd;
}
int V4L2CompatManager::dup(int oldfd)
{
int newfd = dup_func_(oldfd);
if (newfd < 0)
return newfd;
auto device = devices_.find(oldfd);
if (device != devices_.end()) {
V4L2CameraProxy *proxy = device->second;
devices_[newfd] = proxy;
proxy->dup();
}
return newfd;
}
int V4L2CompatManager::close(int fd)
{
V4L2CameraProxy *proxy = getProxy(fd);
if (proxy) {
proxy->close();
devices_.erase(fd);
return 0;
}
return close_func_(fd);
}
void *V4L2CompatManager::mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset)
{
V4L2CameraProxy *proxy = getProxy(fd);
if (!proxy)
return mmap_func_(addr, length, prot, flags, fd, offset);
void *map = proxy->mmap(length, prot, flags, offset);
if (map == MAP_FAILED)
return map;
mmaps_[map] = proxy;
return map;
}
int V4L2CompatManager::munmap(void *addr, size_t length)
{
auto device = mmaps_.find(addr);
if (device == mmaps_.end())
return munmap_func_(addr, length);
V4L2CameraProxy *proxy = device->second;
int ret = proxy->munmap(addr, length);
if (ret < 0)
return ret;
mmaps_.erase(device);
return 0;
}
int V4L2CompatManager::ioctl(int fd, unsigned long request, void *arg)
{
V4L2CameraProxy *proxy = getProxy(fd);
if (!proxy)
return ioctl_func_(fd, request, arg);
return proxy->ioctl(request, arg);
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_compat_manager.h - V4L2 compatibility manager
*/
#ifndef __V4L2_COMPAT_MANAGER_H__
#define __V4L2_COMPAT_MANAGER_H__
#include <condition_variable>
#include <fcntl.h>
#include <map>
#include <memory>
#include <mutex>
#include <sys/types.h>
#include <vector>
#include <libcamera/camera_manager.h>
#include "thread.h"
#include "v4l2_camera_proxy.h"
using namespace libcamera;
class V4L2CompatManager : public Thread
{
public:
static V4L2CompatManager *instance();
int init();
V4L2CameraProxy *getProxy(int fd);
int openat(int dirfd, const char *path, int oflag, mode_t mode);
int dup(int oldfd);
int close(int fd);
void *mmap(void *addr, size_t length, int prot, int flags,
int fd, off_t offset);
int munmap(void *addr, size_t length);
int ioctl(int fd, unsigned long request, void *arg);
private:
V4L2CompatManager();
~V4L2CompatManager();
void run() override;
int getCameraIndex(int fd);
typedef int (*openat_func_t)(int dirfd, const char *path, int oflag, ...);
typedef int (*dup_func_t)(int oldfd);
typedef int (*close_func_t)(int fd);
typedef int (*ioctl_func_t)(int fd, unsigned long request, ...);
typedef void *(*mmap_func_t)(void *addr, size_t length, int prot,
int flags, int fd, off_t offset);
typedef int (*munmap_func_t)(void *addr, size_t length);
openat_func_t openat_func_;
dup_func_t dup_func_;
close_func_t close_func_;
ioctl_func_t ioctl_func_;
mmap_func_t mmap_func_;
munmap_func_t munmap_func_;
CameraManager *cm_;
std::mutex mutex_;
std::condition_variable cv_;
bool initialized_;
std::vector<std::unique_ptr<V4L2CameraProxy>> proxies_;
std::map<int, V4L2CameraProxy *> devices_;
std::map<void *, V4L2CameraProxy *> mmaps_;
};
#endif /* __V4L2_COMPAT_MANAGER_H__ */