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android: camera_buffer: Map buffer in the first plane() call

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CameraBuffer implementation maps a given buffer_handle_t in
constructor. Mapping is redundant to only know the plane info like
stride and offset. Mapping should be executed later in the first
plane() call.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Hirokazu Honda 2021-08-26 17:00:20 +09:00 • committed by Laurent Pinchart
parent 7bfe7d7056
commit c5e2ed7806
2 changed files with 100 additions and 57 deletions
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86
src/android/mm/generic_camera_buffer.cpp
View file

@ -37,6 +37,18 @@ public:
size_t jpegBufferSize(size_t maxJpegBufferSize) const;
private:
struct PlaneInfo {
unsigned int offset;
unsigned int size;
};
void map();
int fd_;
int flags_;
off_t bufferLength_;
bool mapped_;
std::vector<PlaneInfo> planeInfo_;
/* \todo Remove planes_ when it will be added to MappedBuffer */
std::vector<Span<uint8_t>> planes_;
};
@ -45,6 +57,7 @@ CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
buffer_handle_t camera3Buffer,
libcamera::PixelFormat pixelFormat,
const libcamera::Size &size, int flags)
: fd_(-1), flags_(flags), bufferLength_(0), mapped_(false)
{
error_ = 0;
@ -61,43 +74,35 @@ CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
* now that the buffer is backed by a single dmabuf, with planes being
* stored contiguously.
*/
int fd = -1;
for (int i = 0; i < camera3Buffer->numFds; i++) {
if (camera3Buffer->data[i] == -1 || camera3Buffer->data[i] == fd)
if (camera3Buffer->data[i] == -1 || camera3Buffer->data[i] == fd_)
continue;
if (fd != -1) {
if (fd_ != -1) {
error_ = -EINVAL;
LOG(HAL, Error) << "Discontiguous planes are not supported";
return;
}
fd = camera3Buffer->data[i];
fd_ = camera3Buffer->data[i];
}
if (fd == -1) {
if (fd_ == -1) {
error_ = -EINVAL;
LOG(HAL, Error) << "No valid file descriptor";
return;
}
off_t bufferLength = lseek(fd, 0, SEEK_END);
if (bufferLength < 0) {
bufferLength_ = lseek(fd_, 0, SEEK_END);
if (bufferLength_ < 0) {
error_ = -errno;
LOG(HAL, Error) << "Failed to get buffer length";
return;
}
void *address = mmap(nullptr, bufferLength, flags, MAP_SHARED, fd, 0);
if (address == MAP_FAILED) {
error_ = -errno;
LOG(HAL, Error) << "Failed to mmap plane";
return;
}
maps_.emplace_back(static_cast<uint8_t *>(address), bufferLength);
const unsigned int numPlanes = info.numPlanes();
planes_.resize(numPlanes);
planeInfo_.resize(numPlanes);
unsigned int offset = 0;
for (unsigned int i = 0; i < numPlanes; ++i) {
/*
@ -109,17 +114,17 @@ CameraBuffer::Private::Private([[maybe_unused]] CameraBuffer *cameraBuffer,
const unsigned int planeSize =
stride * ((size.height + vertSubSample - 1) / vertSubSample);
planes_[i] = libcamera::Span<uint8_t>(
static_cast<uint8_t *>(address) + offset, planeSize);
planeInfo_[i].offset = offset;
planeInfo_[i].size = planeSize;
if (bufferLength < offset + planeSize) {
error_ = -EINVAL;
LOG(HAL, Error) << "Plane " << i << " is out of buffer"
<< ", buffer length=" << bufferLength
<< ", offset=" << offset
<< ", size=" << planeSize;
if (bufferLength_ < offset + planeSize) {
LOG(HAL, Error) << "Plane " << i << " is out of buffer:"
<< " plane offset=" << offset
<< ", plane size=" << planeSize
<< ", buffer length=" << bufferLength_;
return;
}
offset += planeSize;
}
}
@ -130,12 +135,14 @@ CameraBuffer::Private::~Private()
unsigned int CameraBuffer::Private::numPlanes() const
{
return planes_.size();
return planeInfo_.size();
}
Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
{
if (plane >= planes_.size())
if (!mapped_)
map();
if (!mapped_)
return {};
return planes_[plane];
@ -143,8 +150,31 @@ Span<uint8_t> CameraBuffer::Private::plane(unsigned int plane)
size_t CameraBuffer::Private::jpegBufferSize(size_t maxJpegBufferSize) const
{
return std::min<unsigned int>(maps_[0].size(),
maxJpegBufferSize);
ASSERT(bufferLength_ >= 0);
return std::min<unsigned int>(bufferLength_, maxJpegBufferSize);
}
void CameraBuffer::Private::map()
{
ASSERT(fd_ != -1);
ASSERT(bufferLength_ >= 0);
void *address = mmap(nullptr, bufferLength_, flags_, MAP_SHARED, fd_, 0);
if (address == MAP_FAILED) {
error_ = -errno;
LOG(HAL, Error) << "Failed to mmap plane";
return;
}
maps_.emplace_back(static_cast<uint8_t *>(address), bufferLength_);
planes_.reserve(planeInfo_.size());
for (const auto &info : planeInfo_) {
planes_.emplace_back(
static_cast<uint8_t *>(address) + info.offset, info.size);
}
mapped_ = true;
}
PUBLIC_CAMERA_BUFFER_IMPLEMENTATION