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cobalt / cobalt / 25902c6cb1ab9cfd8ae2ee6b0fb52953f73deda5 / . / media / gpu / v4l2 / v4l2_device.cc
blob: a4c83a40fb149619c866181e19610643780b0f68 [file] [log] [blame]
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/gpu/v4l2/v4l2_device.h"
#include <errno.h>
#include <fcntl.h>
#include <linux/media.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <algorithm>
#include <set>
#include <libdrm/drm_fourcc.h>
#include <linux/media.h>
#include <linux/videodev2.h>
#include <string.h>
#include <sys/mman.h>
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/numerics/checked_math.h"
#include "base/numerics/safe_conversions.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/string_number_conversions.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "media/base/color_plane_layout.h"
#include "media/base/media_switches.h"
#include "media/base/video_types.h"
#include "media/gpu/chromeos/fourcc.h"
#include "media/gpu/chromeos/platform_video_frame_utils.h"
#include "media/gpu/macros.h"
#include "media/gpu/v4l2/buffer_affinity_tracker.h"
#include "media/gpu/v4l2/generic_v4l2_device.h"
#include "ui/gfx/generic_shared_memory_id.h"
#include "ui/gfx/native_pixmap_handle.h"
#if defined(AML_V4L2)
#include "media/gpu/v4l2/aml_v4l2_device.h"
#endif
namespace media {
namespace {
// Maximum number of requests that can be created.
constexpr size_t kMaxNumRequests = 32;
gfx::Rect V4L2RectToGfxRect(const v4l2_rect& rect) {
return gfx::Rect(rect.left, rect.top, rect.width, rect.height);
}
struct v4l2_format BuildV4L2Format(const enum v4l2_buf_type type,
uint32_t fourcc,
const gfx::Size& size,
size_t buffer_size) {
struct v4l2_format format;
memset(&format, 0, sizeof(format));
format.type = type;
format.fmt.pix_mp.pixelformat = fourcc;
format.fmt.pix_mp.width = size.width();
format.fmt.pix_mp.height = size.height();
format.fmt.pix_mp.num_planes = V4L2Device::GetNumPlanesOfV4L2PixFmt(fourcc);
format.fmt.pix_mp.plane_fmt[0].sizeimage = buffer_size;
return format;
}
const char* V4L2BufferTypeToString(const enum v4l2_buf_type buf_type) {
switch (buf_type) {
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
return "OUTPUT";
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
return "CAPTURE";
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
return "OUTPUT_MPLANE";
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
return "CAPTURE_MPLANE";
default:
return "UNKNOWN";
}
}
int64_t V4L2BufferTimestampInMilliseconds(
const struct v4l2_buffer* v4l2_buffer) {
struct timespec ts;
TIMEVAL_TO_TIMESPEC(&v4l2_buffer->timestamp, &ts);
return base::TimeDelta::FromTimeSpec(ts).InMilliseconds();
}
// For decoding and encoding data to be processed is enqueued in the
// V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE queue. Once that data has been either
// decompressed or compressed, the finished buffer is dequeued from the
// V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE queue. This occurs asynchronously so
// there is no way to measure how long the hardware took to process the data.
// We can use the length of time that a buffer is enqueued as a proxy for
// how busy the hardware is.
void V4L2ProcessingTrace(const struct v4l2_buffer* v4l2_buffer, bool start) {
constexpr char kTracingCategory[] = "media,gpu";
constexpr char kQueueBuffer[] = "V4L2 Queue Buffer";
constexpr char kDequeueBuffer[] = "V4L2 Dequeue Buffer";
constexpr char kVideoDecoding[] = "V4L2 Video Decoding";
bool tracing_enabled = false;
TRACE_EVENT_CATEGORY_GROUP_ENABLED(kTracingCategory, &tracing_enabled);
if (!tracing_enabled)
return;
const char* name = start ? kQueueBuffer : kDequeueBuffer;
TRACE_EVENT_INSTANT1(kTracingCategory, name, TRACE_EVENT_SCOPE_THREAD, "type",
v4l2_buffer->type);
const int64_t timestamp = V4L2BufferTimestampInMilliseconds(v4l2_buffer);
if (timestamp <= 0)
return;
if (start && v4l2_buffer->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
TRACE_EVENT_NESTABLE_ASYNC_BEGIN1(kTracingCategory, kVideoDecoding,
TRACE_ID_LOCAL(timestamp), "timestamp",
timestamp);
} else if (!start &&
v4l2_buffer->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
TRACE_EVENT_NESTABLE_ASYNC_END1(kTracingCategory, kVideoDecoding,
TRACE_ID_LOCAL(timestamp), "timestamp",
timestamp);
}
}
bool LibV4L2Exists() {
#if BUILDFLAG(USE_LIBV4L2)
return true;
#elif BUILDFLAG(IS_CHROMEOS_LACROS)
if (access(V4L2Device::kLibV4l2Path, F_OK) == 0)
return true;
PLOG_IF(FATAL, errno != ENOENT)
<< "access() failed for a reason other than ENOENT";
return false;
#else
return false;
#endif
}
} // namespace
V4L2ExtCtrl::V4L2ExtCtrl(uint32_t id) {
memset(&ctrl, 0, sizeof(ctrl));
ctrl.id = id;
}
V4L2ExtCtrl::V4L2ExtCtrl(uint32_t id, int32_t val) : V4L2ExtCtrl(id) {
ctrl.value = val;
}
// Class used to store the state of a buffer that should persist between
// reference creations. This includes:
// * Result of initial VIDIOC_QUERYBUF ioctl,
// * Plane mappings.
//
// Also provides helper functions.
class V4L2Buffer {
public:
static std::unique_ptr<V4L2Buffer> Create(scoped_refptr<V4L2Device> device,
enum v4l2_buf_type type,
enum v4l2_memory memory,
const struct v4l2_format& format,
size_t buffer_id);
V4L2Buffer(const V4L2Buffer&) = delete;
V4L2Buffer& operator=(const V4L2Buffer&) = delete;
~V4L2Buffer();
void* GetPlaneMapping(const size_t plane);
size_t GetMemoryUsage() const;
const struct v4l2_buffer& v4l2_buffer() const { return v4l2_buffer_; }
scoped_refptr<VideoFrame> GetVideoFrame();
private:
V4L2Buffer(scoped_refptr<V4L2Device> device,
enum v4l2_buf_type type,
enum v4l2_memory memory,
const struct v4l2_format& format,
size_t buffer_id);
bool Query();
scoped_refptr<VideoFrame> CreateVideoFrame();
scoped_refptr<V4L2Device> device_;
std::vector<void*> plane_mappings_;
// V4L2 data as queried by QUERYBUF.
struct v4l2_buffer v4l2_buffer_;
// WARNING: do not change this to a vector or something smaller than
// VIDEO_MAX_PLANES (the maximum number of planes V4L2 supports). The
// element overhead is small and may avoid memory corruption bugs.
struct v4l2_plane v4l2_planes_[VIDEO_MAX_PLANES];
struct v4l2_format format_;
scoped_refptr<VideoFrame> video_frame_;
};
std::unique_ptr<V4L2Buffer> V4L2Buffer::Create(scoped_refptr<V4L2Device> device,
enum v4l2_buf_type type,
enum v4l2_memory memory,
const struct v4l2_format& format,
size_t buffer_id) {
// Not using std::make_unique because constructor is private.
std::unique_ptr<V4L2Buffer> buffer(
new V4L2Buffer(device, type, memory, format, buffer_id));
if (!buffer->Query())
return nullptr;
return buffer;
}
V4L2Buffer::V4L2Buffer(scoped_refptr<V4L2Device> device,
enum v4l2_buf_type type,
enum v4l2_memory memory,
const struct v4l2_format& format,
size_t buffer_id)
: device_(device), format_(format) {
DCHECK(V4L2_TYPE_IS_MULTIPLANAR(type));
DCHECK_LE(format.fmt.pix_mp.num_planes, std::size(v4l2_planes_));
memset(&v4l2_buffer_, 0, sizeof(v4l2_buffer_));
memset(v4l2_planes_, 0, sizeof(v4l2_planes_));
v4l2_buffer_.m.planes = v4l2_planes_;
// Just in case we got more planes than we want.
v4l2_buffer_.length =
std::min(static_cast<size_t>(format.fmt.pix_mp.num_planes),
std::size(v4l2_planes_));
v4l2_buffer_.index = buffer_id;
v4l2_buffer_.type = type;
v4l2_buffer_.memory = memory;
plane_mappings_.resize(v4l2_buffer_.length);
}
V4L2Buffer::~V4L2Buffer() {
if (v4l2_buffer_.memory == V4L2_MEMORY_MMAP) {
for (size_t i = 0; i < plane_mappings_.size(); i++)
if (plane_mappings_[i] != nullptr)
device_->Munmap(plane_mappings_[i], v4l2_buffer_.m.planes[i].length);
}
}
bool V4L2Buffer::Query() {
int ret = device_->Ioctl(VIDIOC_QUERYBUF, &v4l2_buffer_);
if (ret) {
VPLOGF(1) << "VIDIOC_QUERYBUF failed: ";
return false;
}
DCHECK(plane_mappings_.size() == v4l2_buffer_.length);
return true;
}
void* V4L2Buffer::GetPlaneMapping(const size_t plane) {
if (plane >= plane_mappings_.size()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return nullptr;
}
void* p = plane_mappings_[plane];
if (p)
return p;
// Do this check here to avoid repeating it after a buffer has been
// successfully mapped (we know we are of MMAP type by then).
if (v4l2_buffer_.memory != V4L2_MEMORY_MMAP) {
VLOGF(1) << "Cannot create mapping on non-MMAP buffer";
return nullptr;
}
p = device_->Mmap(nullptr, v4l2_buffer_.m.planes[plane].length,
PROT_READ | PROT_WRITE, MAP_SHARED,
v4l2_buffer_.m.planes[plane].m.mem_offset);
if (p == MAP_FAILED) {
VPLOGF(1) << "mmap() failed: ";
return nullptr;
}
plane_mappings_[plane] = p;
return p;
}
size_t V4L2Buffer::GetMemoryUsage() const {
size_t usage = 0;
for (size_t i = 0; i < v4l2_buffer_.length; i++) {
usage += v4l2_buffer_.m.planes[i].length;
}
return usage;
}
scoped_refptr<VideoFrame> V4L2Buffer::CreateVideoFrame() {
auto layout = V4L2Device::V4L2FormatToVideoFrameLayout(format_);
if (!layout) {
VLOGF(1) << "Cannot create frame layout for V4L2 buffers";
return nullptr;
}
std::vector<base::ScopedFD> dmabuf_fds = device_->GetDmabufsForV4L2Buffer(
v4l2_buffer_.index, v4l2_buffer_.length,
static_cast<enum v4l2_buf_type>(v4l2_buffer_.type));
if (dmabuf_fds.empty()) {
VLOGF(1) << "Failed to get DMABUFs of V4L2 buffer";
return nullptr;
}
// DMA buffer fds should not be invalid
for (const auto& dmabuf_fd : dmabuf_fds) {
if (!dmabuf_fd.is_valid()) {
DLOG(ERROR) << "Fail to get DMABUFs of V4L2 buffer - invalid fd";
return nullptr;
}
}
// Duplicate the fd of the last v4l2 plane until the number of fds are the
// same as the number of color planes.
while (dmabuf_fds.size() < layout->planes().size()) {
int duped_fd = HANDLE_EINTR(dup(dmabuf_fds.back().get()));
if (duped_fd == -1) {
DLOG(ERROR) << "Failed duplicating dmabuf fd";
return nullptr;
}
dmabuf_fds.emplace_back(duped_fd);
}
gfx::Size size(format_.fmt.pix_mp.width, format_.fmt.pix_mp.height);
return VideoFrame::WrapExternalDmabufs(
*layout, gfx::Rect(size), size, std::move(dmabuf_fds), base::TimeDelta());
}
scoped_refptr<VideoFrame> V4L2Buffer::GetVideoFrame() {
// We can create the VideoFrame only when using MMAP buffers.
if (v4l2_buffer_.memory != V4L2_MEMORY_MMAP) {
VLOGF(1) << "Cannot create video frame from non-MMAP buffer";
// Allow NOTREACHED() on invalid argument because this is an internal
// method.
NOTREACHED();
}
// Create the video frame instance if requiring it for the first time.
if (!video_frame_)
video_frame_ = CreateVideoFrame();
return video_frame_;
}
// A thread-safe pool of buffer indexes, allowing buffers to be obtained and
// returned from different threads. All the methods of this class are
// thread-safe. Users should keep a scoped_refptr to instances of this class
// in order to ensure the list remains alive as long as they need it.
class V4L2BuffersList : public base::RefCountedThreadSafe<V4L2BuffersList> {
public:
V4L2BuffersList() = default;
V4L2BuffersList(const V4L2BuffersList&) = delete;
V4L2BuffersList& operator=(const V4L2BuffersList&) = delete;
// Return a buffer to this list. Also can be called to set the initial pool
// of buffers.
// Note that it is illegal to return the same buffer twice.
void ReturnBuffer(size_t buffer_id);
// Get any of the buffers in the list. There is no order guarantee whatsoever.
absl::optional<size_t> GetFreeBuffer();
// Get the buffer with specified index.
absl::optional<size_t> GetFreeBuffer(size_t requested_buffer_id);
// Number of buffers currently in this list.
size_t size() const;
private:
friend class base::RefCountedThreadSafe<V4L2BuffersList>;
~V4L2BuffersList() = default;
mutable base::Lock lock_;
std::set<size_t> free_buffers_ GUARDED_BY(lock_);
};
void V4L2BuffersList::ReturnBuffer(size_t buffer_id) {
base::AutoLock auto_lock(lock_);
auto inserted = free_buffers_.emplace(buffer_id);
DCHECK(inserted.second);
}
absl::optional<size_t> V4L2BuffersList::GetFreeBuffer() {
base::AutoLock auto_lock(lock_);
auto iter = free_buffers_.begin();
if (iter == free_buffers_.end()) {
DVLOGF(4) << "No free buffer available!";
return absl::nullopt;
}
size_t buffer_id = *iter;
free_buffers_.erase(iter);
return buffer_id;
}
absl::optional<size_t> V4L2BuffersList::GetFreeBuffer(
size_t requested_buffer_id) {
base::AutoLock auto_lock(lock_);
return (free_buffers_.erase(requested_buffer_id) > 0)
? absl::make_optional(requested_buffer_id)
: absl::nullopt;
}
size_t V4L2BuffersList::size() const {
base::AutoLock auto_lock(lock_);
return free_buffers_.size();
}
// Module-private class that let users query/write V4L2 buffer information.
// It also makes some private V4L2Queue methods available to this module only.
class V4L2BufferRefBase {
public:
V4L2BufferRefBase(const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue);
V4L2BufferRefBase(const V4L2BufferRefBase&) = delete;
V4L2BufferRefBase& operator=(const V4L2BufferRefBase&) = delete;
~V4L2BufferRefBase();
bool QueueBuffer(scoped_refptr<VideoFrame> video_frame);
void* GetPlaneMapping(const size_t plane);
scoped_refptr<VideoFrame> GetVideoFrame();
// Checks that the number of passed FDs is adequate for the current format
// and buffer configuration. Only useful for DMABUF buffers.
bool CheckNumFDsForFormat(const size_t num_fds) const;
// Data from the buffer, that users can query and/or write.
struct v4l2_buffer v4l2_buffer_;
// WARNING: do not change this to a vector or something smaller than
// VIDEO_MAX_PLANES (the maximum number of planes V4L2 supports). The
// element overhead is small and may avoid memory corruption bugs.
struct v4l2_plane v4l2_planes_[VIDEO_MAX_PLANES];
private:
size_t BufferId() const { return v4l2_buffer_.index; }
friend class V4L2WritableBufferRef;
// A weak pointer to the queue this buffer belongs to. Will remain valid as
// long as the underlying V4L2 buffer is valid too.
// This can only be accessed from the sequence protected by sequence_checker_.
// Thread-safe methods (like ~V4L2BufferRefBase) must *never* access this.
base::WeakPtr<V4L2Queue> queue_;
// Where to return this buffer if it goes out of scope without being queued.
scoped_refptr<V4L2BuffersList> return_to_;
bool queued = false;
SEQUENCE_CHECKER(sequence_checker_);
};
V4L2BufferRefBase::V4L2BufferRefBase(const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue)
: queue_(std::move(queue)), return_to_(queue_->free_buffers_) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(V4L2_TYPE_IS_MULTIPLANAR(v4l2_buffer.type));
DCHECK_LE(v4l2_buffer.length, std::size(v4l2_planes_));
DCHECK(return_to_);
memcpy(&v4l2_buffer_, &v4l2_buffer, sizeof(v4l2_buffer_));
memcpy(v4l2_planes_, v4l2_buffer.m.planes,
sizeof(struct v4l2_plane) * v4l2_buffer.length);
v4l2_buffer_.m.planes = v4l2_planes_;
}
V4L2BufferRefBase::~V4L2BufferRefBase() {
// We are the last reference and are only accessing the thread-safe
// return_to_, so we are safe to call from any sequence.
// If we have been queued, then the queue is our owner so we don't need to
// return to the free buffers list.
if (!queued)
return_to_->ReturnBuffer(BufferId());
}
bool V4L2BufferRefBase::QueueBuffer(scoped_refptr<VideoFrame> video_frame) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!queue_)
return false;
queued = queue_->QueueBuffer(&v4l2_buffer_, std::move(video_frame));
return queued;
}
void* V4L2BufferRefBase::GetPlaneMapping(const size_t plane) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!queue_)
return nullptr;
return queue_->buffers_[BufferId()]->GetPlaneMapping(plane);
}
scoped_refptr<VideoFrame> V4L2BufferRefBase::GetVideoFrame() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Used so we can return a const scoped_refptr& in all cases.
static const scoped_refptr<VideoFrame> null_videoframe;
if (!queue_)
return null_videoframe;
DCHECK_LE(BufferId(), queue_->buffers_.size());
return queue_->buffers_[BufferId()]->GetVideoFrame();
}
bool V4L2BufferRefBase::CheckNumFDsForFormat(const size_t num_fds) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!queue_)
return false;
// We have not used SetFormat(), assume this is ok.
// Hopefully we standardize SetFormat() in the future.
if (!queue_->current_format_)
return true;
const size_t required_fds = queue_->current_format_->fmt.pix_mp.num_planes;
// Sanity check.
DCHECK_EQ(v4l2_buffer_.length, required_fds);
if (num_fds < required_fds) {
VLOGF(1) << "Insufficient number of FDs given for the current format. "
<< num_fds << " provided, " << required_fds << " required.";
return false;
}
const auto* planes = v4l2_buffer_.m.planes;
for (size_t i = v4l2_buffer_.length - 1; i >= num_fds; --i) {
// Assume that an fd is a duplicate of a previous plane's fd if offset != 0.
// Otherwise, if offset == 0, return error as it is likely pointing to
// a new plane.
if (planes[i].data_offset == 0) {
VLOGF(1) << "Additional dmabuf fds point to a new buffer.";
return false;
}
}
return true;
}
V4L2WritableBufferRef::V4L2WritableBufferRef(
const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue)
: buffer_data_(
std::make_unique<V4L2BufferRefBase>(v4l2_buffer, std::move(queue))) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
V4L2WritableBufferRef::V4L2WritableBufferRef(V4L2WritableBufferRef&& other)
: buffer_data_(std::move(other.buffer_data_)) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_CALLED_ON_VALID_SEQUENCE(other.sequence_checker_);
}
V4L2WritableBufferRef::~V4L2WritableBufferRef() {
// Only valid references should be sequence-checked
if (buffer_data_) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
}
V4L2WritableBufferRef& V4L2WritableBufferRef::operator=(
V4L2WritableBufferRef&& other) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_CALLED_ON_VALID_SEQUENCE(other.sequence_checker_);
if (this == &other)
return *this;
buffer_data_ = std::move(other.buffer_data_);
return *this;
}
scoped_refptr<VideoFrame> V4L2WritableBufferRef::GetVideoFrame() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->GetVideoFrame();
}
enum v4l2_memory V4L2WritableBufferRef::Memory() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return static_cast<enum v4l2_memory>(buffer_data_->v4l2_buffer_.memory);
}
bool V4L2WritableBufferRef::DoQueue(V4L2RequestRef* request_ref,
scoped_refptr<VideoFrame> video_frame) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (request_ref && buffer_data_->queue_->SupportsRequests() &&
!request_ref->ApplyQueueBuffer(&(buffer_data_->v4l2_buffer_))) {
return false;
}
bool queued = buffer_data_->QueueBuffer(std::move(video_frame));
// Clear our own reference.
buffer_data_.reset();
return queued;
}
bool V4L2WritableBufferRef::QueueMMap(
V4L2RequestRef* request_ref) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
// Move ourselves so our data gets freed no matter when we return
V4L2WritableBufferRef self(std::move(*this));
if (self.Memory() != V4L2_MEMORY_MMAP) {
VLOGF(1) << "Called on invalid buffer type!";
return false;
}
return std::move(self).DoQueue(request_ref, nullptr);
}
bool V4L2WritableBufferRef::QueueUserPtr(
const std::vector<void*>& ptrs,
V4L2RequestRef* request_ref) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
// Move ourselves so our data gets freed no matter when we return
V4L2WritableBufferRef self(std::move(*this));
if (self.Memory() != V4L2_MEMORY_USERPTR) {
VLOGF(1) << "Called on invalid buffer type!";
return false;
}
if (ptrs.size() != self.PlanesCount()) {
VLOGF(1) << "Provided " << ptrs.size() << " pointers while we require "
<< self.buffer_data_->v4l2_buffer_.length << ".";
return false;
}
for (size_t i = 0; i < ptrs.size(); i++)
self.buffer_data_->v4l2_buffer_.m.planes[i].m.userptr =
reinterpret_cast<unsigned long>(ptrs[i]);
return std::move(self).DoQueue(request_ref, nullptr);
}
bool V4L2WritableBufferRef::QueueDMABuf(
const std::vector<base::ScopedFD>& fds,
V4L2RequestRef* request_ref) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
// Move ourselves so our data gets freed no matter when we return
V4L2WritableBufferRef self(std::move(*this));
if (self.Memory() != V4L2_MEMORY_DMABUF) {
VLOGF(1) << "Called on invalid buffer type!";
return false;
}
if (!self.buffer_data_->CheckNumFDsForFormat(fds.size()))
return false;
size_t num_planes = self.PlanesCount();
for (size_t i = 0; i < num_planes; i++)
self.buffer_data_->v4l2_buffer_.m.planes[i].m.fd = fds[i].get();
return std::move(self).DoQueue(request_ref, nullptr);
}
bool V4L2WritableBufferRef::QueueDMABuf(scoped_refptr<VideoFrame> video_frame,
V4L2RequestRef* request_ref) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
// Move ourselves so our data gets freed no matter when we return
V4L2WritableBufferRef self(std::move(*this));
if (self.Memory() != V4L2_MEMORY_DMABUF) {
VLOGF(1) << "Called on invalid buffer type!";
return false;
}
// TODO(andrescj): consider replacing this by a DCHECK.
if (video_frame->storage_type() != VideoFrame::STORAGE_GPU_MEMORY_BUFFER &&
video_frame->storage_type() != VideoFrame::STORAGE_DMABUFS) {
VLOGF(1) << "Only GpuMemoryBuffer and dma-buf VideoFrames are supported";
return false;
}
// The FDs duped by CreateGpuMemoryBufferHandle() will be closed after the
// call to DoQueue() which uses the VIDIOC_QBUF ioctl and so ends up
// increasing the reference count of the dma-buf. Thus, closing the FDs is
// safe.
// TODO(andrescj): for dma-buf VideoFrames, duping the FDs is unnecessary.
// Consider handling that path separately.
gfx::GpuMemoryBufferHandle gmb_handle =
CreateGpuMemoryBufferHandle(video_frame.get());
if (gmb_handle.type != gfx::GpuMemoryBufferType::NATIVE_PIXMAP) {
VLOGF(1) << "Failed to create GpuMemoryBufferHandle for frame!";
return false;
}
const std::vector<gfx::NativePixmapPlane>& planes =
gmb_handle.native_pixmap_handle.planes;
if (!self.buffer_data_->CheckNumFDsForFormat(planes.size()))
return false;
size_t num_planes = self.PlanesCount();
for (size_t i = 0; i < num_planes; i++)
self.buffer_data_->v4l2_buffer_.m.planes[i].m.fd = planes[i].fd.get();
return std::move(self).DoQueue(request_ref, std::move(video_frame));
}
bool V4L2WritableBufferRef::QueueDMABuf(
const std::vector<gfx::NativePixmapPlane>& planes,
V4L2RequestRef* request_ref) && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
// Move ourselves so our data gets freed no matter when we return
V4L2WritableBufferRef self(std::move(*this));
if (self.Memory() != V4L2_MEMORY_DMABUF) {
VLOGF(1) << "Called on invalid buffer type!";
return false;
}
if (!self.buffer_data_->CheckNumFDsForFormat(planes.size()))
return false;
size_t num_planes = self.PlanesCount();
for (size_t i = 0; i < num_planes; i++)
self.buffer_data_->v4l2_buffer_.m.planes[i].m.fd = planes[i].fd.get();
return std::move(self).DoQueue(request_ref, nullptr);
}
size_t V4L2WritableBufferRef::PlanesCount() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.length;
}
size_t V4L2WritableBufferRef::GetPlaneSize(const size_t plane) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return 0;
}
return buffer_data_->v4l2_buffer_.m.planes[plane].length;
}
void V4L2WritableBufferRef::SetPlaneSize(const size_t plane,
const size_t size) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
enum v4l2_memory memory = Memory();
if (memory == V4L2_MEMORY_MMAP) {
DCHECK_EQ(buffer_data_->v4l2_buffer_.m.planes[plane].length, size);
return;
}
DCHECK(memory == V4L2_MEMORY_USERPTR || memory == V4L2_MEMORY_DMABUF);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return;
}
buffer_data_->v4l2_buffer_.m.planes[plane].length = size;
}
void* V4L2WritableBufferRef::GetPlaneMapping(const size_t plane) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->GetPlaneMapping(plane);
}
void V4L2WritableBufferRef::SetTimeStamp(const struct timeval& timestamp) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
buffer_data_->v4l2_buffer_.timestamp = timestamp;
}
const struct timeval& V4L2WritableBufferRef::GetTimeStamp() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.timestamp;
}
void V4L2WritableBufferRef::SetPlaneBytesUsed(const size_t plane,
const size_t bytes_used) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return;
}
if (bytes_used > GetPlaneSize(plane)) {
VLOGF(1) << "Set bytes used " << bytes_used << " larger than plane size "
<< GetPlaneSize(plane) << ".";
return;
}
buffer_data_->v4l2_buffer_.m.planes[plane].bytesused = bytes_used;
}
size_t V4L2WritableBufferRef::GetPlaneBytesUsed(const size_t plane) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return 0;
}
return buffer_data_->v4l2_buffer_.m.planes[plane].bytesused;
}
void V4L2WritableBufferRef::SetPlaneDataOffset(const size_t plane,
const size_t data_offset) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return;
}
buffer_data_->v4l2_buffer_.m.planes[plane].data_offset = data_offset;
}
size_t V4L2WritableBufferRef::BufferId() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.index;
}
V4L2ReadableBuffer::V4L2ReadableBuffer(const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue,
scoped_refptr<VideoFrame> video_frame)
: buffer_data_(
std::make_unique<V4L2BufferRefBase>(v4l2_buffer, std::move(queue))),
video_frame_(std::move(video_frame)) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
scoped_refptr<VideoFrame> V4L2ReadableBuffer::GetVideoFrame() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (buffer_data_->v4l2_buffer_.memory == V4L2_MEMORY_DMABUF && video_frame_)
return video_frame_;
return buffer_data_->GetVideoFrame();
}
V4L2ReadableBuffer::~V4L2ReadableBuffer() {
// This method is thread-safe. Since we are the destructor, we are guaranteed
// to be called from the only remaining reference to us. Also, we are just
// calling the destructor of buffer_data_, which is also thread-safe.
DCHECK(buffer_data_);
}
bool V4L2ReadableBuffer::IsLast() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.flags & V4L2_BUF_FLAG_LAST;
}
bool V4L2ReadableBuffer::IsKeyframe() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.flags & V4L2_BUF_FLAG_KEYFRAME;
}
struct timeval V4L2ReadableBuffer::GetTimeStamp() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.timestamp;
}
size_t V4L2ReadableBuffer::PlanesCount() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.length;
}
const void* V4L2ReadableBuffer::GetPlaneMapping(const size_t plane) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->GetPlaneMapping(plane);
}
size_t V4L2ReadableBuffer::GetPlaneBytesUsed(const size_t plane) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return 0;
}
return buffer_data_->v4l2_planes_[plane].bytesused;
}
size_t V4L2ReadableBuffer::GetPlaneDataOffset(const size_t plane) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
if (plane >= PlanesCount()) {
VLOGF(1) << "Invalid plane " << plane << " requested.";
return 0;
}
return buffer_data_->v4l2_planes_[plane].data_offset;
}
size_t V4L2ReadableBuffer::BufferId() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(buffer_data_);
return buffer_data_->v4l2_buffer_.index;
}
// This class is used to expose buffer reference classes constructors to
// this module. This is to ensure that nobody else can create buffer references.
class V4L2BufferRefFactory {
public:
static V4L2WritableBufferRef CreateWritableRef(
const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue) {
return V4L2WritableBufferRef(v4l2_buffer, std::move(queue));
}
static V4L2ReadableBufferRef CreateReadableRef(
const struct v4l2_buffer& v4l2_buffer,
base::WeakPtr<V4L2Queue> queue,
scoped_refptr<VideoFrame> video_frame) {
return new V4L2ReadableBuffer(v4l2_buffer, std::move(queue),
std::move(video_frame));
}
};
// Helper macros that print the queue type with logs.
#define VPQLOGF(level) \
VPLOGF(level) << "(" << V4L2BufferTypeToString(type_) << ") "
#define VQLOGF(level) \
VLOGF(level) << "(" << V4L2BufferTypeToString(type_) << ") "
#define DVQLOGF(level) \
DVLOGF(level) << "(" << V4L2BufferTypeToString(type_) << ") "
V4L2Queue::V4L2Queue(scoped_refptr<V4L2Device> dev,
enum v4l2_buf_type type,
base::OnceClosure destroy_cb)
: type_(type),
affinity_tracker_(0),
device_(dev),
destroy_cb_(std::move(destroy_cb)),
weak_this_factory_(this) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Check if this queue support requests.
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = 0;
reqbufs.type = type;
reqbufs.memory = V4L2_MEMORY_MMAP;
if (device_->Ioctl(VIDIOC_REQBUFS, &reqbufs) != 0) {
VPLOGF(1) << "Request support checks's VIDIOC_REQBUFS ioctl failed.";
return;
}
if (reqbufs.capabilities & V4L2_BUF_CAP_SUPPORTS_REQUESTS) {
supports_requests_ = true;
DVLOGF(4) << "Queue supports request API.";
}
}
V4L2Queue::~V4L2Queue() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (is_streaming_) {
VQLOGF(1) << "Queue is still streaming, trying to stop it...";
if (!Streamoff())
VQLOGF(1) << "Failed to stop queue";
}
DCHECK(queued_buffers_.empty());
DCHECK(!free_buffers_);
if (!buffers_.empty()) {
VQLOGF(1) << "Buffers are still allocated, trying to deallocate them...";
if (!DeallocateBuffers())
VQLOGF(1) << "Failed to deallocate queue buffers";
}
std::move(destroy_cb_).Run();
}
absl::optional<struct v4l2_format> V4L2Queue::SetFormat(uint32_t fourcc,
const gfx::Size& size,
size_t buffer_size) {
struct v4l2_format format = BuildV4L2Format(type_, fourcc, size, buffer_size);
if (device_->Ioctl(VIDIOC_S_FMT, &format) != 0 ||
format.fmt.pix_mp.pixelformat != fourcc) {
VPQLOGF(2) << "Failed to set format fourcc: " << FourccToString(fourcc);
return absl::nullopt;
}
current_format_ = format;
return current_format_;
}
absl::optional<struct v4l2_format> V4L2Queue::TryFormat(uint32_t fourcc,
const gfx::Size& size,
size_t buffer_size) {
struct v4l2_format format = BuildV4L2Format(type_, fourcc, size, buffer_size);
if (device_->Ioctl(VIDIOC_TRY_FMT, &format) != 0 ||
format.fmt.pix_mp.pixelformat != fourcc) {
VPQLOGF(2) << "Failed to try format fourcc: " << FourccToString(fourcc);
return absl::nullopt;
}
return format;
}
std::pair<absl::optional<struct v4l2_format>, int> V4L2Queue::GetFormat() {
struct v4l2_format format;
memset(&format, 0, sizeof(format));
format.type = type_;
if (device_->Ioctl(VIDIOC_G_FMT, &format) != 0) {
VPQLOGF(2) << "Failed to get format";
return std::make_pair(absl::nullopt, errno);
}
return std::make_pair(format, 0);
}
absl::optional<gfx::Rect> V4L2Queue::GetVisibleRect() {
// Some drivers prior to 4.13 only accept the non-MPLANE variant when using
// VIDIOC_G_SELECTION. This block can be removed once we stop supporting
// kernels < 4.13.
// For details, see the note at
// https://www.kernel.org/doc/html/latest/media/uapi/v4l/vidioc-g-selection.html
enum v4l2_buf_type compose_type;
switch (type_) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
compose_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
compose_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
break;
default:
compose_type = type_;
break;
}
struct v4l2_selection selection;
memset(&selection, 0, sizeof(selection));
selection.type = compose_type;
selection.target = V4L2_SEL_TGT_COMPOSE;
if (device_->Ioctl(VIDIOC_G_SELECTION, &selection) == 0) {
DVQLOGF(3) << "VIDIOC_G_SELECTION is supported";
return V4L2RectToGfxRect(selection.r);
}
// TODO(acourbot) using VIDIOC_G_CROP is considered legacy and can be
// removed once no active devices use it anymore.
DVQLOGF(3) << "Fallback to VIDIOC_G_CROP";
struct v4l2_crop crop;
memset(&crop, 0, sizeof(crop));
crop.type = type_;
if (device_->Ioctl(VIDIOC_G_CROP, &crop) == 0) {
return V4L2RectToGfxRect(crop.c);
}
VQLOGF(1) << "Failed to get visible rect";
return absl::nullopt;
}
size_t V4L2Queue::AllocateBuffers(size_t count,
enum v4l2_memory memory,
bool incoherent) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!free_buffers_);
DCHECK(queued_buffers_.empty());
incoherent_ = incoherent;
if (IsStreaming()) {
VQLOGF(1) << "Cannot allocate buffers while streaming.";
return 0;
}
if (buffers_.size() != 0) {
VQLOGF(1)
<< "Cannot allocate new buffers while others are still allocated.";
return 0;
}
if (count == 0) {
VQLOGF(1) << "Attempting to allocate 0 buffers.";
return 0;
}
// First query the number of planes in the buffers we are about to request.
absl::optional<v4l2_format> format = GetFormat().first;
if (!format) {
VQLOGF(1) << "Cannot get format.";
return 0;
}
planes_count_ = format->fmt.pix_mp.num_planes;
DCHECK_LE(planes_count_, static_cast<size_t>(VIDEO_MAX_PLANES));
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = count;
reqbufs.type = type_;
reqbufs.memory = memory;
reqbufs.flags = incoherent ? V4L2_MEMORY_FLAG_NON_COHERENT : 0;
DVQLOGF(3) << "Requesting " << count << " buffers.";
DVQLOGF(3) << "Incoherent flag is " << incoherent << ".";
int ret = device_->Ioctl(VIDIOC_REQBUFS, &reqbufs);
if (ret) {
VPQLOGF(1) << "VIDIOC_REQBUFS failed";
return 0;
}
DVQLOGF(3) << "queue " << type_ << ": got " << reqbufs.count << " buffers.";
memory_ = memory;
free_buffers_ = new V4L2BuffersList();
// Now query all buffer information.
for (size_t i = 0; i < reqbufs.count; i++) {
auto buffer = V4L2Buffer::Create(device_, type_, memory_, *format, i);
if (!buffer) {
if (!DeallocateBuffers())
VQLOGF(1) << "Failed to deallocate queue buffers";
return 0;
}
buffers_.emplace_back(std::move(buffer));
free_buffers_->ReturnBuffer(i);
}
affinity_tracker_.resize(buffers_.size());
DCHECK(free_buffers_);
DCHECK_EQ(free_buffers_->size(), buffers_.size());
DCHECK(queued_buffers_.empty());
return buffers_.size();
}
bool V4L2Queue::DeallocateBuffers() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (IsStreaming()) {
VQLOGF(1) << "Cannot deallocate buffers while streaming.";
return false;
}
if (buffers_.size() == 0)
return true;
weak_this_factory_.InvalidateWeakPtrs();
buffers_.clear();
affinity_tracker_.resize(0);
free_buffers_ = nullptr;
// Free all buffers.
struct v4l2_requestbuffers reqbufs;
memset(&reqbufs, 0, sizeof(reqbufs));
reqbufs.count = 0;
reqbufs.type = type_;
reqbufs.memory = memory_;
reqbufs.flags = incoherent_ ? V4L2_MEMORY_FLAG_NON_COHERENT : 0;
int ret = device_->Ioctl(VIDIOC_REQBUFS, &reqbufs);
if (ret) {
VPQLOGF(1) << "VIDIOC_REQBUFS failed";
return false;
}
DCHECK(!free_buffers_);
DCHECK(queued_buffers_.empty());
return true;
}
size_t V4L2Queue::GetMemoryUsage() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
size_t usage = 0;
for (const auto& buf : buffers_) {
usage += buf->GetMemoryUsage();
}
return usage;
}
v4l2_memory V4L2Queue::GetMemoryType() const {
return memory_;
}
absl::optional<V4L2WritableBufferRef> V4L2Queue::GetFreeBuffer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// No buffers allocated at the moment?
if (!free_buffers_)
return absl::nullopt;
auto buffer_id = free_buffers_->GetFreeBuffer();
if (!buffer_id.has_value())
return absl::nullopt;
return V4L2BufferRefFactory::CreateWritableRef(
buffers_[buffer_id.value()]->v4l2_buffer(),
weak_this_factory_.GetWeakPtr());
}
absl::optional<V4L2WritableBufferRef> V4L2Queue::GetFreeBuffer(
size_t requested_buffer_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// No buffers allocated at the moment?
if (!free_buffers_)
return absl::nullopt;
auto buffer_id = free_buffers_->GetFreeBuffer(requested_buffer_id);
if (!buffer_id.has_value())
return absl::nullopt;
return V4L2BufferRefFactory::CreateWritableRef(
buffers_[buffer_id.value()]->v4l2_buffer(),
weak_this_factory_.GetWeakPtr());
}
absl::optional<V4L2WritableBufferRef> V4L2Queue::GetFreeBufferForFrame(
const VideoFrame& frame) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// No buffers allocated at the moment?
if (!free_buffers_)
return absl::nullopt;
if (memory_ != V4L2_MEMORY_DMABUF) {
DVLOGF(1) << "Queue is not DMABUF";
return absl::nullopt;
}
gfx::GenericSharedMemoryId id;
if (auto* gmb = frame.GetGpuMemoryBuffer()) {
id = gmb->GetId();
} else if (frame.HasDmaBufs()) {
id = gfx::GenericSharedMemoryId(frame.DmabufFds()[0].get());
} else {
DVLOGF(1) << "Unsupported frame provided";
return absl::nullopt;
}
const auto v4l2_id = affinity_tracker_.get_buffer_for_id(id);
if (!v4l2_id) {
return absl::nullopt;
}
return GetFreeBuffer(*v4l2_id);
}
bool V4L2Queue::QueueBuffer(struct v4l2_buffer* v4l2_buffer,
scoped_refptr<VideoFrame> video_frame) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
V4L2ProcessingTrace(v4l2_buffer, /*start=*/true);
int ret = device_->Ioctl(VIDIOC_QBUF, v4l2_buffer);
if (ret) {
VPQLOGF(1) << "VIDIOC_QBUF failed";
return false;
}
const auto inserted =
queued_buffers_.emplace(v4l2_buffer->index, std::move(video_frame));
DCHECK(inserted.second);
device_->SchedulePoll();
return true;
}
std::pair<bool, V4L2ReadableBufferRef> V4L2Queue::DequeueBuffer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// No need to dequeue if no buffers queued.
if (QueuedBuffersCount() == 0)
return std::make_pair(true, nullptr);
if (!IsStreaming()) {
VQLOGF(1) << "Attempting to dequeue a buffer while not streaming.";
return std::make_pair(true, nullptr);
}
struct v4l2_buffer v4l2_buffer;
memset(&v4l2_buffer, 0, sizeof(v4l2_buffer));
// WARNING: do not change this to a vector or something smaller than
// VIDEO_MAX_PLANES (the maximum number of planes V4L2 supports). The
// element overhead is small and may avoid memory corruption bugs.
struct v4l2_plane planes[VIDEO_MAX_PLANES];
memset(planes, 0, sizeof(planes));
v4l2_buffer.type = type_;
v4l2_buffer.memory = memory_;
v4l2_buffer.m.planes = planes;
v4l2_buffer.length = planes_count_;
int ret = device_->Ioctl(VIDIOC_DQBUF, &v4l2_buffer);
if (ret) {
// TODO(acourbot): we should not have to check for EPIPE as codec clients
// should not call this method after the last buffer is dequeued.
switch (errno) {
case EAGAIN:
case EPIPE:
// This is not an error so we'll need to continue polling but won't
// provide a buffer.
device_->SchedulePoll();
return std::make_pair(true, nullptr);
default:
VPQLOGF(1) << "VIDIOC_DQBUF failed";
return std::make_pair(false, nullptr);
}
}
auto it = queued_buffers_.find(v4l2_buffer.index);
DCHECK(it != queued_buffers_.end());
scoped_refptr<VideoFrame> queued_frame = std::move(it->second);
queued_buffers_.erase(it);
V4L2ProcessingTrace(&v4l2_buffer, /*start=*/false);
if (QueuedBuffersCount() > 0)
device_->SchedulePoll();
DCHECK(free_buffers_);
return std::make_pair(true, V4L2BufferRefFactory::CreateReadableRef(
v4l2_buffer, weak_this_factory_.GetWeakPtr(),
std::move(queued_frame)));
}
bool V4L2Queue::IsStreaming() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return is_streaming_;
}
bool V4L2Queue::Streamon() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (is_streaming_)
return true;
int arg = static_cast<int>(type_);
int ret = device_->Ioctl(VIDIOC_STREAMON, &arg);
if (ret) {
VPQLOGF(1) << "VIDIOC_STREAMON failed";
return false;
}
is_streaming_ = true;
return true;
}
bool V4L2Queue::Streamoff() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// We do not check the value of IsStreaming(), because we may have queued
// buffers to the queue and wish to get them back - in such as case, we may
// need to do a VIDIOC_STREAMOFF on a stopped queue.
int arg = static_cast<int>(type_);
int ret = device_->Ioctl(VIDIOC_STREAMOFF, &arg);
if (ret) {
VPQLOGF(1) << "VIDIOC_STREAMOFF failed";
return false;
}
for (const auto& it : queued_buffers_) {
DCHECK(free_buffers_);
free_buffers_->ReturnBuffer(it.first);
}
queued_buffers_.clear();
is_streaming_ = false;
return true;
}
size_t V4L2Queue::AllocatedBuffersCount() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return buffers_.size();
}
size_t V4L2Queue::FreeBuffersCount() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return free_buffers_ ? free_buffers_->size() : 0;
}
size_t V4L2Queue::QueuedBuffersCount() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return queued_buffers_.size();
}
#undef VDQLOGF
#undef VPQLOGF
#undef VQLOGF
bool V4L2Queue::SupportsRequests() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return supports_requests_;
}
absl::optional<struct v4l2_format> V4L2Queue::SetModifierFormat(
uint64_t modifier,
const gfx::Size& size) {
if (DRM_FORMAT_MOD_QCOM_COMPRESSED == modifier) {
auto format = SetFormat(V4L2_PIX_FMT_QC08C, size, 0);
if (!format)
VPLOGF(1) << "Failed to set magic modifier format.";
return format;
}
return absl::nullopt;
}
// This class is used to expose V4L2Queue's constructor to this module. This is
// to ensure that nobody else can create instances of it.
class V4L2QueueFactory {
public:
static scoped_refptr<V4L2Queue> CreateQueue(scoped_refptr<V4L2Device> dev,
enum v4l2_buf_type type,
base::OnceClosure destroy_cb) {
return new V4L2Queue(std::move(dev), type, std::move(destroy_cb));
}
};
V4L2Device::V4L2Device() {
DETACH_FROM_SEQUENCE(client_sequence_checker_);
}
V4L2Device::~V4L2Device() = default;
scoped_refptr<V4L2Queue> V4L2Device::GetQueue(enum v4l2_buf_type type) {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
switch (type) {
// Supported queue types.
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
break;
default:
VLOGF(1) << "Unsupported V4L2 queue type: " << type;
return nullptr;
}
// TODO(acourbot): we should instead query the device for available queues,
// and allocate them accordingly. This will do for now though.
auto it = queues_.find(type);
if (it != queues_.end())
return scoped_refptr<V4L2Queue>(it->second);
scoped_refptr<V4L2Queue> queue = V4L2QueueFactory::CreateQueue(
this, type, base::BindOnce(&V4L2Device::OnQueueDestroyed, this, type));
queues_[type] = queue.get();
return queue;
}
void V4L2Device::OnQueueDestroyed(v4l2_buf_type buf_type) {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
auto it = queues_.find(buf_type);
DCHECK(it != queues_.end());
queues_.erase(it);
}
// static
scoped_refptr<V4L2Device> V4L2Device::Create() {
DVLOGF(3);
scoped_refptr<V4L2Device> device;
#if defined(AML_V4L2)
device = new AmlV4L2Device();
if (device->Initialize())
return device;
#endif
device = new GenericV4L2Device();
if (device->Initialize())
return device;
VLOGF(1) << "Failed to create a V4L2Device";
return nullptr;
}
std::string V4L2Device::GetDriverName() {
struct v4l2_capability caps;
memset(&caps, 0, sizeof(caps));
if (Ioctl(VIDIOC_QUERYCAP, &caps) != 0) {
VPLOGF(1) << "ioctl() failed: VIDIOC_QUERYCAP"
<< ", caps check failed: 0x" << std::hex << caps.capabilities;
return "";
}
return std::string(reinterpret_cast<const char*>(caps.driver));
}
// static
uint32_t V4L2Device::VideoCodecProfileToV4L2PixFmt(VideoCodecProfile profile,
bool slice_based) {
if (profile >= H264PROFILE_MIN && profile <= H264PROFILE_MAX) {
if (slice_based)
return V4L2_PIX_FMT_H264_SLICE;
else
return V4L2_PIX_FMT_H264;
#if BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
} else if (profile >= HEVCPROFILE_MIN && profile <= HEVCPROFILE_MAX) {
if (slice_based) {
return V4L2_PIX_FMT_HEVC_SLICE;
} else {
return V4L2_PIX_FMT_HEVC;
}
#endif // BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
} else if (profile >= VP8PROFILE_MIN && profile <= VP8PROFILE_MAX) {
if (slice_based)
return V4L2_PIX_FMT_VP8_FRAME;
else
return V4L2_PIX_FMT_VP8;
} else if (profile >= VP9PROFILE_MIN && profile <= VP9PROFILE_MAX) {
if (slice_based)
return V4L2_PIX_FMT_VP9_FRAME;
else
return V4L2_PIX_FMT_VP9;
} else if (profile >= AV1PROFILE_MIN && profile <= AV1PROFILE_MAX) {
if (slice_based)
return V4L2_PIX_FMT_AV1_FRAME;
else
return V4L2_PIX_FMT_AV1;
} else {
DVLOGF(1) << "Unsupported profile: " << GetProfileName(profile);
return 0;
}
}
namespace {
VideoCodecProfile V4L2ProfileToVideoCodecProfile(VideoCodec codec,
uint32_t v4l2_profile) {
switch (codec) {
case VideoCodec::kH264:
switch (v4l2_profile) {
// H264 Stereo amd Multiview High are not tested and the use is
// minuscule, skip.
case V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE:
case V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE:
return H264PROFILE_BASELINE;
case V4L2_MPEG_VIDEO_H264_PROFILE_MAIN:
return H264PROFILE_MAIN;
case V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED:
return H264PROFILE_EXTENDED;
case V4L2_MPEG_VIDEO_H264_PROFILE_HIGH:
return H264PROFILE_HIGH;
}
break;
case VideoCodec::kVP8:
switch (v4l2_profile) {
case V4L2_MPEG_VIDEO_VP8_PROFILE_0:
case V4L2_MPEG_VIDEO_VP8_PROFILE_1:
case V4L2_MPEG_VIDEO_VP8_PROFILE_2:
case V4L2_MPEG_VIDEO_VP8_PROFILE_3:
return VP8PROFILE_ANY;
}
break;
case VideoCodec::kVP9:
switch (v4l2_profile) {
// VP9 Profile 1 and 3 are not tested and the use is minuscule, skip.
case V4L2_MPEG_VIDEO_VP9_PROFILE_0:
return VP9PROFILE_PROFILE0;
case V4L2_MPEG_VIDEO_VP9_PROFILE_2:
return VP9PROFILE_PROFILE2;
}
break;
#if BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
case VideoCodec::kHEVC:
switch (v4l2_profile) {
case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN:
return HEVCPROFILE_MAIN;
case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE:
return HEVCPROFILE_MAIN_STILL_PICTURE;
case V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10:
return HEVCPROFILE_MAIN10;
}
break;
#endif
#if BUILDFLAG(IS_CHROMEOS)
case VideoCodec::kAV1:
switch (v4l2_profile) {
case V4L2_MPEG_VIDEO_AV1_PROFILE_MAIN:
return AV1PROFILE_PROFILE_MAIN;
case V4L2_MPEG_VIDEO_AV1_PROFILE_HIGH:
return AV1PROFILE_PROFILE_HIGH;
case V4L2_MPEG_VIDEO_AV1_PROFILE_PROFESSIONAL:
return AV1PROFILE_PROFILE_PRO;
}
break;
#endif
default:
VLOGF(2) << "Unsupported codec: " << GetCodecName(codec);
}
VLOGF(2) << "Unsupported V4L2 profile: " << v4l2_profile;
return VIDEO_CODEC_PROFILE_UNKNOWN;
}
} // namespace
std::vector<VideoCodecProfile> V4L2Device::V4L2PixFmtToVideoCodecProfiles(
uint32_t pix_fmt) {
auto get_supported_profiles = [this](
VideoCodec codec,
std::vector<VideoCodecProfile>* profiles) {
uint32_t query_id = 0;
switch (codec) {
case VideoCodec::kH264:
query_id = V4L2_CID_MPEG_VIDEO_H264_PROFILE;
break;
#if BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
case VideoCodec::kHEVC:
query_id = V4L2_CID_MPEG_VIDEO_HEVC_PROFILE;
break;
#endif // BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
case VideoCodec::kVP8:
query_id = V4L2_CID_MPEG_VIDEO_VP8_PROFILE;
break;
case VideoCodec::kVP9:
query_id = V4L2_CID_MPEG_VIDEO_VP9_PROFILE;
break;
#if BUILDFLAG(IS_CHROMEOS)
case VideoCodec::kAV1:
query_id = V4L2_CID_MPEG_VIDEO_AV1_PROFILE;
break;
#endif
default:
return false;
}
v4l2_queryctrl query_ctrl;
memset(&query_ctrl, 0, sizeof(query_ctrl));
query_ctrl.id = query_id;
if (Ioctl(VIDIOC_QUERYCTRL, &query_ctrl) != 0)
return false;
v4l2_querymenu query_menu;
memset(&query_menu, 0, sizeof(query_menu));
query_menu.id = query_ctrl.id;
for (query_menu.index = query_ctrl.minimum;
static_cast<int>(query_menu.index) <= query_ctrl.maximum;
query_menu.index++) {
if (Ioctl(VIDIOC_QUERYMENU, &query_menu) == 0) {
const VideoCodecProfile profile =
V4L2ProfileToVideoCodecProfile(codec, query_menu.index);
if (profile != VIDEO_CODEC_PROFILE_UNKNOWN)
profiles->push_back(profile);
}
}
return true;
};
std::vector<VideoCodecProfile> profiles;
switch (pix_fmt) {
case V4L2_PIX_FMT_H264:
case V4L2_PIX_FMT_H264_SLICE:
if (!get_supported_profiles(VideoCodec::kH264, &profiles)) {
DLOG(WARNING) << "Driver doesn't support QUERY H264 profiles, "
<< "use default values, Base, Main, High";
profiles = {
H264PROFILE_BASELINE,
H264PROFILE_MAIN,
H264PROFILE_HIGH,
};
}
break;
#if BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
case V4L2_PIX_FMT_HEVC:
case V4L2_PIX_FMT_HEVC_SLICE:
if (!get_supported_profiles(VideoCodec::kHEVC, &profiles)) {
DLOG(WARNING) << "Driver doesn't support QUERY HEVC profiles, "
<< "use default value, Main";
profiles = {
HEVCPROFILE_MAIN,
};
}
break;
#endif // BUILDFLAG(ENABLE_HEVC_PARSER_AND_HW_DECODER)
case V4L2_PIX_FMT_VP8:
case V4L2_PIX_FMT_VP8_FRAME:
profiles = {VP8PROFILE_ANY};
break;
case V4L2_PIX_FMT_VP9:
case V4L2_PIX_FMT_VP9_FRAME:
if (!get_supported_profiles(VideoCodec::kVP9, &profiles)) {
DLOG(WARNING) << "Driver doesn't support QUERY VP9 profiles, "
<< "use default values, Profile0";
profiles = {VP9PROFILE_PROFILE0};
}
break;
case V4L2_PIX_FMT_AV1:
case V4L2_PIX_FMT_AV1_FRAME:
if (!get_supported_profiles(VideoCodec::kAV1, &profiles)) {
DLOG(WARNING) << "Driver doesn't support QUERY AV1 profiles, "
<< "use default values, Main";
profiles = {AV1PROFILE_PROFILE_MAIN};
}
break;
default:
VLOGF(1) << "Unhandled pixelformat " << FourccToString(pix_fmt);
return {};
}
// Erase duplicated profiles.
std::sort(profiles.begin(), profiles.end());
profiles.erase(std::unique(profiles.begin(), profiles.end()), profiles.end());
return profiles;
}
// static
int32_t V4L2Device::VideoCodecProfileToV4L2H264Profile(
VideoCodecProfile profile) {
switch (profile) {
case H264PROFILE_BASELINE:
return V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE;
case H264PROFILE_MAIN:
return V4L2_MPEG_VIDEO_H264_PROFILE_MAIN;
case H264PROFILE_EXTENDED:
return V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED;
case H264PROFILE_HIGH:
return V4L2_MPEG_VIDEO_H264_PROFILE_HIGH;
case H264PROFILE_HIGH10PROFILE:
return V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10;
case H264PROFILE_HIGH422PROFILE:
return V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422;
case H264PROFILE_HIGH444PREDICTIVEPROFILE:
return V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE;
case H264PROFILE_SCALABLEBASELINE:
return V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE;
case H264PROFILE_SCALABLEHIGH:
return V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH;
case H264PROFILE_STEREOHIGH:
return V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH;
case H264PROFILE_MULTIVIEWHIGH:
return V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH;
default:
DVLOGF(1) << "Add more cases as needed";
return -1;
}
}
// static
int32_t V4L2Device::H264LevelIdcToV4L2H264Level(uint8_t level_idc) {
switch (level_idc) {
case 10:
return V4L2_MPEG_VIDEO_H264_LEVEL_1_0;
case 9:
return V4L2_MPEG_VIDEO_H264_LEVEL_1B;
case 11:
return V4L2_MPEG_VIDEO_H264_LEVEL_1_1;
case 12:
return V4L2_MPEG_VIDEO_H264_LEVEL_1_2;
case 13:
return V4L2_MPEG_VIDEO_H264_LEVEL_1_3;
case 20:
return V4L2_MPEG_VIDEO_H264_LEVEL_2_0;
case 21:
return V4L2_MPEG_VIDEO_H264_LEVEL_2_1;
case 22:
return V4L2_MPEG_VIDEO_H264_LEVEL_2_2;
case 30:
return V4L2_MPEG_VIDEO_H264_LEVEL_3_0;
case 31:
return V4L2_MPEG_VIDEO_H264_LEVEL_3_1;
case 32:
return V4L2_MPEG_VIDEO_H264_LEVEL_3_2;
case 40:
return V4L2_MPEG_VIDEO_H264_LEVEL_4_0;
case 41:
return V4L2_MPEG_VIDEO_H264_LEVEL_4_1;
case 42:
return V4L2_MPEG_VIDEO_H264_LEVEL_4_2;
case 50:
return V4L2_MPEG_VIDEO_H264_LEVEL_5_0;
case 51:
return V4L2_MPEG_VIDEO_H264_LEVEL_5_1;
default:
DVLOGF(1) << "Unrecognized level_idc: " << static_cast<int>(level_idc);
return -1;
}
}
// static
gfx::Size V4L2Device::AllocatedSizeFromV4L2Format(
const struct v4l2_format& format) {
gfx::Size coded_size;
gfx::Size visible_size;
VideoPixelFormat frame_format = PIXEL_FORMAT_UNKNOWN;
size_t bytesperline = 0;
// Total bytes in the frame.
size_t sizeimage = 0;
if (V4L2_TYPE_IS_MULTIPLANAR(format.type)) {
DCHECK_GT(format.fmt.pix_mp.num_planes, 0);
bytesperline =
base::checked_cast<int>(format.fmt.pix_mp.plane_fmt[0].bytesperline);
for (size_t i = 0; i < format.fmt.pix_mp.num_planes; ++i) {
sizeimage +=
base::checked_cast<int>(format.fmt.pix_mp.plane_fmt[i].sizeimage);
}
visible_size.SetSize(base::checked_cast<int>(format.fmt.pix_mp.width),
base::checked_cast<int>(format.fmt.pix_mp.height));
const uint32_t pix_fmt = format.fmt.pix_mp.pixelformat;
const auto frame_fourcc = Fourcc::FromV4L2PixFmt(pix_fmt);
if (!frame_fourcc) {
VLOGF(1) << "Unsupported format " << FourccToString(pix_fmt);
return coded_size;
}
frame_format = frame_fourcc->ToVideoPixelFormat();
} else {
bytesperline = base::checked_cast<int>(format.fmt.pix.bytesperline);
sizeimage = base::checked_cast<int>(format.fmt.pix.sizeimage);
visible_size.SetSize(base::checked_cast<int>(format.fmt.pix.width),
base::checked_cast<int>(format.fmt.pix.height));
const uint32_t fourcc = format.fmt.pix.pixelformat;
const auto frame_fourcc = Fourcc::FromV4L2PixFmt(fourcc);
if (!frame_fourcc) {
VLOGF(1) << "Unsupported format " << FourccToString(fourcc);
return coded_size;
}
frame_format = frame_fourcc ? frame_fourcc->ToVideoPixelFormat()
: PIXEL_FORMAT_UNKNOWN;
}
// V4L2 does not provide per-plane bytesperline (bpl) when different
// components are sharing one physical plane buffer. In this case, it only
// provides bpl for the first component in the plane. So we can't depend on it
// for calculating height, because bpl may vary within one physical plane
// buffer. For example, YUV420 contains 3 components in one physical plane,
// with Y at 8 bits per pixel, and Cb/Cr at 4 bits per pixel per component,
// but we only get 8 pits per pixel from bytesperline in physical plane 0.
// So we need to get total frame bpp from elsewhere to calculate coded height.
// We need bits per pixel for one component only to calculate
// coded_width from bytesperline.
int plane_horiz_bits_per_pixel =
VideoFrame::PlaneHorizontalBitsPerPixel(frame_format, 0);
// Adding up bpp for each component will give us total bpp for all components.
int total_bpp = 0;
for (size_t i = 0; i < VideoFrame::NumPlanes(frame_format); ++i)
total_bpp += VideoFrame::PlaneBitsPerPixel(frame_format, i);
if (sizeimage == 0 || bytesperline == 0 || plane_horiz_bits_per_pixel == 0 ||
total_bpp == 0 || (bytesperline * 8) % plane_horiz_bits_per_pixel != 0) {
VLOGF(1) << "Invalid format provided";
return coded_size;
}
// Coded width can be calculated by taking the first component's bytesperline,
// which in V4L2 always applies to the first component in physical plane
// buffer.
int coded_width = bytesperline * 8 / plane_horiz_bits_per_pixel;
// Sizeimage is coded_width * coded_height * total_bpp. In the case that we
// don't have exact alignment due to padding in the driver, round up so that
// the buffer is large enough.
std::div_t res = std::div(sizeimage * 8, coded_width * total_bpp);
int coded_height = res.quot + std::min(res.rem, 1);
coded_size.SetSize(coded_width, coded_height);
DVLOGF(3) << "coded_size=" << coded_size.ToString();
// Sanity checks. Calculated coded size has to contain given visible size
// and fulfill buffer byte size requirements.
DCHECK(gfx::Rect(coded_size).Contains(gfx::Rect(visible_size)));
DCHECK_LE(sizeimage, VideoFrame::AllocationSize(frame_format, coded_size));
return coded_size;
}
// static
absl::optional<VideoFrameLayout> V4L2Device::V4L2FormatToVideoFrameLayout(
const struct v4l2_format& format) {
if (!V4L2_TYPE_IS_MULTIPLANAR(format.type)) {
VLOGF(1) << "v4l2_buf_type is not multiplanar: " << std::hex << "0x"
<< format.type;
return absl::nullopt;
}
const v4l2_pix_format_mplane& pix_mp = format.fmt.pix_mp;
const uint32_t& pix_fmt = pix_mp.pixelformat;
const auto video_fourcc = Fourcc::FromV4L2PixFmt(pix_fmt);
if (!video_fourcc) {
VLOGF(1) << "Failed to convert pixel format to VideoPixelFormat: "
<< FourccToString(pix_fmt);
return absl::nullopt;
}
const VideoPixelFormat video_format = video_fourcc->ToVideoPixelFormat();
const size_t num_buffers = pix_mp.num_planes;
const size_t num_color_planes = VideoFrame::NumPlanes(video_format);
if (num_color_planes == 0) {
VLOGF(1) << "Unsupported video format for NumPlanes(): "
<< VideoPixelFormatToString(video_format);
return absl::nullopt;
}
if (num_buffers > num_color_planes) {
VLOGF(1) << "pix_mp.num_planes: " << num_buffers
<< " should not be larger than NumPlanes("
<< VideoPixelFormatToString(video_format)
<< "): " << num_color_planes;
return absl::nullopt;
}
// Reserve capacity in advance to prevent unnecessary vector reallocation.
std::vector<ColorPlaneLayout> planes;
planes.reserve(num_color_planes);
for (size_t i = 0; i < num_buffers; ++i) {
const v4l2_plane_pix_format& plane_format = pix_mp.plane_fmt[i];
planes.emplace_back(static_cast<int32_t>(plane_format.bytesperline), 0u,
plane_format.sizeimage);
}
// For the case that #color planes > #buffers, it fills stride of color
// plane which does not map to buffer.
// Right now only some pixel formats are supported: NV12, YUV420, YVU420.
if (num_color_planes > num_buffers) {
const int32_t y_stride = planes[0].stride;
// Note that y_stride is from v4l2 bytesperline and its type is uint32_t.
// It is safe to cast to size_t.
const size_t y_stride_abs = static_cast<size_t>(y_stride);
switch (pix_fmt) {
case V4L2_PIX_FMT_NV12:
// The stride of UV is the same as Y in NV12.
// The height is half of Y plane.
planes.emplace_back(y_stride, y_stride_abs * pix_mp.height,
y_stride_abs * pix_mp.height / 2);
DCHECK_EQ(2u, planes.size());
break;
case V4L2_PIX_FMT_YUV420:
case V4L2_PIX_FMT_YVU420: {
// The spec claims that two Cx rows (including padding) is exactly as
// long as one Y row (including padding). So stride of Y must be even
// number.
if (y_stride % 2 != 0 || pix_mp.height % 2 != 0) {
VLOGF(1) << "Plane-Y stride and height should be even; stride: "
<< y_stride << ", height: " << pix_mp.height;
return absl::nullopt;
}
const int32_t half_stride = y_stride / 2;
const size_t plane_0_area = y_stride_abs * pix_mp.height;
const size_t plane_1_area = plane_0_area / 4;
planes.emplace_back(half_stride, plane_0_area, plane_1_area);
planes.emplace_back(half_stride, plane_0_area + plane_1_area,
plane_1_area);
DCHECK_EQ(3u, planes.size());
break;
}
default:
VLOGF(1) << "Cannot derive stride for each plane for pixel format "
<< FourccToString(pix_fmt);
return absl::nullopt;
}
}
// Some V4L2 devices expect buffers to be page-aligned. We cannot detect
// such devices individually, so set this as a video frame layout property.
constexpr size_t buffer_alignment = 0x1000;
if (num_buffers == 1) {
return VideoFrameLayout::CreateWithPlanes(
video_format, gfx::Size(pix_mp.width, pix_mp.height), std::move(planes),
buffer_alignment);
} else {
return VideoFrameLayout::CreateMultiPlanar(
video_format, gfx::Size(pix_mp.width, pix_mp.height), std::move(planes),
buffer_alignment);
}
}
// static
size_t V4L2Device::GetNumPlanesOfV4L2PixFmt(uint32_t pix_fmt) {
absl::optional<Fourcc> fourcc = Fourcc::FromV4L2PixFmt(pix_fmt);
if (fourcc && fourcc->IsMultiPlanar()) {
return VideoFrame::NumPlanes(fourcc->ToVideoPixelFormat());
}
return 1u;
}
// static
bool V4L2Device::UseLibV4L2() {
static const bool use_libv4l2 = LibV4L2Exists();
return use_libv4l2;
}
void V4L2Device::GetSupportedResolution(uint32_t pixelformat,
gfx::Size* min_resolution,
gfx::Size* max_resolution) {
max_resolution->SetSize(0, 0);
min_resolution->SetSize(0, 0);
v4l2_frmsizeenum frame_size;
memset(&frame_size, 0, sizeof(frame_size));
frame_size.pixel_format = pixelformat;
for (; Ioctl(VIDIOC_ENUM_FRAMESIZES, &frame_size) == 0; ++frame_size.index) {
if (frame_size.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
if (frame_size.discrete.width >=
base::checked_cast<uint32_t>(max_resolution->width()) &&
frame_size.discrete.height >=
base::checked_cast<uint32_t>(max_resolution->height())) {
max_resolution->SetSize(frame_size.discrete.width,
frame_size.discrete.height);
}
if (min_resolution->IsEmpty() ||
(frame_size.discrete.width <=
base::checked_cast<uint32_t>(min_resolution->width()) &&
frame_size.discrete.height <=
base::checked_cast<uint32_t>(min_resolution->height()))) {
min_resolution->SetSize(frame_size.discrete.width,
frame_size.discrete.height);
}
} else if (frame_size.type == V4L2_FRMSIZE_TYPE_STEPWISE ||
frame_size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
max_resolution->SetSize(frame_size.stepwise.max_width,
frame_size.stepwise.max_height);
min_resolution->SetSize(frame_size.stepwise.min_width,
frame_size.stepwise.min_height);
break;
}
}
if (max_resolution->IsEmpty()) {
max_resolution->SetSize(1920, 1088);
VLOGF(1) << "GetSupportedResolution failed to get maximum resolution for "
<< "fourcc " << FourccToString(pixelformat) << ", fall back to "
<< max_resolution->ToString();
}
if (min_resolution->IsEmpty()) {
min_resolution->SetSize(16, 16);
VLOGF(1) << "GetSupportedResolution failed to get minimum resolution for "
<< "fourcc " << FourccToString(pixelformat) << ", fall back to "
<< min_resolution->ToString();
}
}
VideoEncodeAccelerator::SupportedRateControlMode
V4L2Device::GetSupportedRateControlMode() {
auto rate_control_mode = VideoEncodeAccelerator::kNoMode;
v4l2_queryctrl query_ctrl;
memset(&query_ctrl, 0, sizeof(query_ctrl));
query_ctrl.id = V4L2_CID_MPEG_VIDEO_BITRATE_MODE;
if (Ioctl(VIDIOC_QUERYCTRL, &query_ctrl)) {
DPLOG(WARNING) << "QUERYCTRL for bitrate mode failed";
return rate_control_mode;
}
v4l2_querymenu query_menu;
memset(&query_menu, 0, sizeof(query_menu));
query_menu.id = query_ctrl.id;
for (query_menu.index = query_ctrl.minimum;
base::checked_cast<int>(query_menu.index) <= query_ctrl.maximum;
query_menu.index++) {
if (Ioctl(VIDIOC_QUERYMENU, &query_menu) == 0) {
switch (query_menu.index) {
case V4L2_MPEG_VIDEO_BITRATE_MODE_CBR:
rate_control_mode |= VideoEncodeAccelerator::kConstantMode;
break;
case V4L2_MPEG_VIDEO_BITRATE_MODE_VBR:
if (!base::FeatureList::IsEnabled(kChromeOSHWVBREncoding)) {
DVLOGF(3) << "Skip VBR capability";
break;
}
rate_control_mode |= VideoEncodeAccelerator::kVariableMode;
break;
default:
DVLOGF(4) << "Skip bitrate mode: " << query_menu.index;
break;
}
}
}
return rate_control_mode;
}
std::vector<uint32_t> V4L2Device::EnumerateSupportedPixelformats(
v4l2_buf_type buf_type) {
std::vector<uint32_t> pixelformats;
v4l2_fmtdesc fmtdesc;
memset(&fmtdesc, 0, sizeof(fmtdesc));
fmtdesc.type = buf_type;
for (; Ioctl(VIDIOC_ENUM_FMT, &fmtdesc) == 0; ++fmtdesc.index) {
DVLOGF(3) << "Found " << FourccToString(fmtdesc.pixelformat) << " ("
<< fmtdesc.description << ")";
pixelformats.push_back(fmtdesc.pixelformat);
}
return pixelformats;
}
VideoDecodeAccelerator::SupportedProfiles
V4L2Device::EnumerateSupportedDecodeProfiles(const size_t num_formats,
const uint32_t pixelformats[]) {
VideoDecodeAccelerator::SupportedProfiles profiles;
const auto& supported_pixelformats =
EnumerateSupportedPixelformats(V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
for (uint32_t pixelformat : supported_pixelformats) {
if (std::find(pixelformats, pixelformats + num_formats, pixelformat) ==
pixelformats + num_formats)
continue;
// Skip AV1 decoder profiles if kChromeOSHWAV1Decoder is disabled.
if ((pixelformat == V4L2_PIX_FMT_AV1 ||
pixelformat == V4L2_PIX_FMT_AV1_FRAME) &&
!base::FeatureList::IsEnabled(kChromeOSHWAV1Decoder)) {
continue;
}
VideoDecodeAccelerator::SupportedProfile profile;
GetSupportedResolution(pixelformat, &profile.min_resolution,
&profile.max_resolution);
const auto video_codec_profiles =
V4L2PixFmtToVideoCodecProfiles(pixelformat);
for (const auto& video_codec_profile : video_codec_profiles) {
profile.profile = video_codec_profile;
profiles.push_back(profile);
DVLOGF(3) << "Found decoder profile " << GetProfileName(profile.profile)
<< ", resolutions: " << profile.min_resolution.ToString() << " "
<< profile.max_resolution.ToString();
}
}
return profiles;
}
VideoEncodeAccelerator::SupportedProfiles
V4L2Device::EnumerateSupportedEncodeProfiles() {
VideoEncodeAccelerator::SupportedProfiles profiles;
const auto& supported_pixelformats =
EnumerateSupportedPixelformats(V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);
for (const auto& pixelformat : supported_pixelformats) {
VideoEncodeAccelerator::SupportedProfile profile;
profile.max_framerate_numerator = 30;
profile.max_framerate_denominator = 1;
profile.rate_control_modes = GetSupportedRateControlMode();
if (profile.rate_control_modes == VideoEncodeAccelerator::kNoMode) {
DLOG(ERROR) << "Skipped because no bitrate mode is supported for "
<< FourccToString(pixelformat);
continue;
}
gfx::Size min_resolution;
GetSupportedResolution(pixelformat, &min_resolution,
&profile.max_resolution);
const auto video_codec_profiles =
V4L2PixFmtToVideoCodecProfiles(pixelformat);
for (const auto& video_codec_profile : video_codec_profiles) {
profile.profile = video_codec_profile;
profiles.push_back(profile);
DVLOGF(3) << "Found encoder profile " << GetProfileName(profile.profile)
<< ", max resolution: " << profile.max_resolution.ToString();
}
}
return profiles;
}
bool V4L2Device::StartPolling(V4L2DevicePoller::EventCallback event_callback,
base::RepeatingClosure error_callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
if (!device_poller_) {
device_poller_ =
std::make_unique<V4L2DevicePoller>(this, "V4L2DevicePollerThread");
}
bool ret = device_poller_->StartPolling(std::move(event_callback),
std::move(error_callback));
if (!ret)
device_poller_ = nullptr;
return ret;
}
bool V4L2Device::StopPolling() {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
return !device_poller_ || device_poller_->StopPolling();
}
void V4L2Device::SchedulePoll() {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
if (!device_poller_ || !device_poller_->IsPolling())
return;
device_poller_->SchedulePoll();
}
absl::optional<struct v4l2_event> V4L2Device::DequeueEvent() {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
struct v4l2_event event;
memset(&event, 0, sizeof(event));
if (Ioctl(VIDIOC_DQEVENT, &event) != 0) {
// The ioctl will fail if there are no pending events. This is part of the
// normal flow, so keep this log level low.
VPLOGF(4) << "Failed to dequeue event";
return absl::nullopt;
}
return event;
}
V4L2RequestsQueue* V4L2Device::GetRequestsQueue() {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
if (requests_queue_creation_called_)
return requests_queue_.get();
requests_queue_creation_called_ = true;
struct v4l2_capability caps;
if (Ioctl(VIDIOC_QUERYCAP, &caps)) {
VPLOGF(1) << "Failed to query device capabilities.";
return nullptr;
}
// Some devices, namely the RK3399, have multiple hardware decoder blocks.
// We have to find and use the matching media device, or the kernel gets
// confused.
// Note that the match persists for the lifetime of V4L2Device. In practice
// this should be fine, since |GetRequestsQueue()| is only called after
// the codec format is configured, and the VD/VDA instance is always tied
// to a specific format, so it will never need to switch media devices.
static const std::string kRequestDevicePrefix = "/dev/media-dec";
// We are sandboxed, so we can't query directory contents to check which
// devices are actually available. Try to open the first 10; if not present,
// we will just fail to open immediately.
base::ScopedFD media_fd;
for (int i = 0; i < 10; ++i) {
const auto path = kRequestDevicePrefix + base::NumberToString(i);
base::ScopedFD candidate_media_fd(
HANDLE_EINTR(open(path.c_str(), O_RDWR, 0)));
if (!candidate_media_fd.is_valid()) {
VPLOGF(2) << "Failed to open media device: " << path;
continue;
}
struct media_device_info media_info;
if (HANDLE_EINTR(ioctl(candidate_media_fd.get(), MEDIA_IOC_DEVICE_INFO,
&media_info)) < 0) {
VPLOGF(2) << "Failed to Query media device info.";
continue;
}
// Match the video device and the media controller by the bus_info
// field. This works better than the driver field if there are multiple
// instances of the same decoder driver in the system. However old MediaTek
// drivers didn't fill in the bus_info field for the media device.
if (strlen(reinterpret_cast<const char*>(caps.bus_info)) > 0 &&
strlen(reinterpret_cast<const char*>(media_info.bus_info)) > 0 &&
strncmp(reinterpret_cast<const char*>(caps.bus_info),
reinterpret_cast<const char*>(media_info.bus_info),
sizeof(caps.bus_info))) {
continue;
}
// Fall back to matching the video device and the media controller by the
// driver field. The mtk-vcodec driver does not fill the card and bus fields
// properly, so those won't work.
if (strncmp(reinterpret_cast<const char*>(caps.driver),
reinterpret_cast<const char*>(media_info.driver),
sizeof(caps.driver))) {
continue;
}
media_fd = std::move(candidate_media_fd);
break;
}
if (!media_fd.is_valid()) {
VLOGF(1) << "Failed to open matching media device.";
return nullptr;
}
// Not using std::make_unique because constructor is private.
std::unique_ptr<V4L2RequestsQueue> requests_queue(
new V4L2RequestsQueue(std::move(media_fd)));
requests_queue_ = std::move(requests_queue);
return requests_queue_.get();
}
bool V4L2Device::IsCtrlExposed(uint32_t ctrl_id) {
struct v4l2_queryctrl query_ctrl;
memset(&query_ctrl, 0, sizeof(query_ctrl));
query_ctrl.id = ctrl_id;
return Ioctl(VIDIOC_QUERYCTRL, &query_ctrl) == 0;
}
bool V4L2Device::SetExtCtrls(uint32_t ctrl_class,
std::vector<V4L2ExtCtrl> ctrls,
V4L2RequestRef* request_ref) {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
if (ctrls.empty())
return true;
struct v4l2_ext_controls ext_ctrls;
memset(&ext_ctrls, 0, sizeof(ext_ctrls));
ext_ctrls.which = V4L2_CTRL_WHICH_CUR_VAL;
ext_ctrls.count = 0;
const bool use_modern_s_ext_ctrls =
Ioctl(VIDIOC_S_EXT_CTRLS, &ext_ctrls) == 0;
ext_ctrls.which =
use_modern_s_ext_ctrls ? V4L2_CTRL_WHICH_CUR_VAL : ctrl_class;
ext_ctrls.count = ctrls.size();
ext_ctrls.controls = &ctrls[0].ctrl;
if (request_ref)
request_ref->ApplyCtrls(&ext_ctrls);
const int result = Ioctl(VIDIOC_S_EXT_CTRLS, &ext_ctrls);
if (result < 0) {
if (ext_ctrls.error_idx == ext_ctrls.count)
VPLOGF(1) << "VIDIOC_S_EXT_CTRLS: validation failed while trying to set "
"controls";
else
VPLOGF(1) << "VIDIOC_S_EXT_CTRLS: unable to set control (0x" << std::hex
<< ctrls[ext_ctrls.error_idx].ctrl.id << ") at index ("
<< ext_ctrls.error_idx << ") to 0x"
<< ctrls[ext_ctrls.error_idx].ctrl.value;
}
return result == 0;
}
absl::optional<struct v4l2_ext_control> V4L2Device::GetCtrl(uint32_t ctrl_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(client_sequence_checker_);
struct v4l2_ext_control ctrl;
memset(&ctrl, 0, sizeof(ctrl));
struct v4l2_ext_controls ext_ctrls;
memset(&ext_ctrls, 0, sizeof(ext_ctrls));
ctrl.id = ctrl_id;
ext_ctrls.controls = &ctrl;
ext_ctrls.count = 1;
if (Ioctl(VIDIOC_G_EXT_CTRLS, &ext_ctrls) != 0) {
VPLOGF(3) << "Failed to get control";
return absl::nullopt;
}
return ctrl;
}
bool V4L2Device::SetGOPLength(uint32_t gop_length) {
if (!SetExtCtrls(V4L2_CTRL_CLASS_MPEG,
{V4L2ExtCtrl(V4L2_CID_MPEG_VIDEO_GOP_SIZE, gop_length)})) {
// Some platforms allow setting the GOP length to 0 as
// a way of turning off keyframe placement. If the platform
// does not support turning off periodic keyframe placement,
// set the GOP to the maximum supported value.
if (gop_length == 0) {
v4l2_query_ext_ctrl queryctrl;
memset(&queryctrl, 0, sizeof(queryctrl));
queryctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CID_MPEG_VIDEO_GOP_SIZE;
if (Ioctl(VIDIOC_QUERY_EXT_CTRL, &queryctrl) == 0) {
VPLOGF(3) << "Unable to set GOP to 0, instead using max : "
<< queryctrl.maximum;
return SetExtCtrls(
V4L2_CTRL_CLASS_MPEG,
{V4L2ExtCtrl(V4L2_CID_MPEG_VIDEO_GOP_SIZE, queryctrl.maximum)});
}
}
return false;
}
return true;
}
class V4L2Request {
public:
V4L2Request(const V4L2Request&) = delete;
V4L2Request& operator=(const V4L2Request&) = delete;
// Apply the passed controls to the request.
bool ApplyCtrls(struct v4l2_ext_controls* ctrls);
// Apply the passed buffer to the request..
bool ApplyQueueBuffer(struct v4l2_buffer* buffer);
// Submits the request to the driver.
bool Submit();
// Indicates if the request has completed.
bool IsCompleted();
// Waits for the request to complete for a determined timeout. Returns false
// if the request is not ready or other error. Default timeout is 500ms.
bool WaitForCompletion(int poll_timeout_ms = 500);
// Resets the request.
bool Reset();
private:
V4L2RequestsQueue* request_queue_;
int ref_counter_ = 0;
base::ScopedFD request_fd_;
friend class V4L2RequestsQueue;
V4L2Request(base::ScopedFD&& request_fd, V4L2RequestsQueue* request_queue) :
request_queue_(request_queue), request_fd_(std::move(request_fd)) {}
friend class V4L2RequestRefBase;
// Increases the number of request references.
void IncRefCounter();
// Decreases the number of request references.
// When the counters reaches zero, the request is returned to the queue.
int DecRefCounter();
SEQUENCE_CHECKER(sequence_checker_);
};
void V4L2Request::IncRefCounter() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
ref_counter_++;
}
int V4L2Request::DecRefCounter() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
ref_counter_--;
if (ref_counter_< 1)
request_queue_->ReturnRequest(this);
return ref_counter_;
}
bool V4L2Request::ApplyCtrls(struct v4l2_ext_controls* ctrls) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(ctrls, nullptr);
if (!request_fd_.is_valid()) {
VPLOGF(1) << "Invalid request";
return false;
}
ctrls->which = V4L2_CTRL_WHICH_REQUEST_VAL;
ctrls->request_fd = request_fd_.get();
return true;
}
bool V4L2Request::ApplyQueueBuffer(struct v4l2_buffer* buffer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(buffer, nullptr);
if (!request_fd_.is_valid()) {
VPLOGF(1) << "Invalid request";
return false;
}
buffer->flags |= V4L2_BUF_FLAG_REQUEST_FD;
buffer->request_fd = request_fd_.get();
return true;
}
bool V4L2Request::Submit() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!request_fd_.is_valid()) {
VPLOGF(1) << "No valid request file descriptor to submit request.";
return false;
}
return HANDLE_EINTR(ioctl(request_fd_.get(), MEDIA_REQUEST_IOC_QUEUE)) == 0;
}
bool V4L2Request::IsCompleted() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return WaitForCompletion(0);
}
bool V4L2Request::WaitForCompletion(int poll_timeout_ms) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!request_fd_.is_valid()) {
VPLOGF(1) << "Invalid request";
return false;
}
struct pollfd poll_fd = {request_fd_.get(), POLLPRI, 0};
// Poll the request to ensure its previous task is done
switch (poll(&poll_fd, 1, poll_timeout_ms)) {
case 1:
return true;
case 0:
// Not an error - we just timed out.
DVLOGF(4) << "Request poll(" << poll_timeout_ms << ") timed out";
return false;
case -1:
VPLOGF(1) << "Failed to poll request";
return false;
default:
NOTREACHED();
return false;
}
}
bool V4L2Request::Reset() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!request_fd_.is_valid()) {
VPLOGF(1) << "Invalid request";
return false;
}
// Reinit the request to make sure we can use it for a new submission.
if (HANDLE_EINTR(ioctl(request_fd_.get(), MEDIA_REQUEST_IOC_REINIT)) < 0) {
VPLOGF(1) << "Failed to reinit request.";
return false;
}
return true;
}
V4L2RequestRefBase::V4L2RequestRefBase(V4L2RequestRefBase&& req_base) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
request_ = req_base.request_;
req_base.request_ = nullptr;
}
V4L2RequestRefBase::V4L2RequestRefBase(V4L2Request* request) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (request) {
request_ = request;
request_->IncRefCounter();
}
}
V4L2RequestRefBase::~V4L2RequestRefBase() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (request_)
request_->DecRefCounter();
}
bool V4L2RequestRef::ApplyCtrls(struct v4l2_ext_controls* ctrls) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(request_, nullptr);
return request_->ApplyCtrls(ctrls);
}
bool V4L2RequestRef::ApplyQueueBuffer(struct v4l2_buffer* buffer) const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(request_, nullptr);
return request_->ApplyQueueBuffer(buffer);
}
absl::optional<V4L2SubmittedRequestRef> V4L2RequestRef::Submit() && {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(request_, nullptr);
V4L2RequestRef self(std::move(*this));
if (!self.request_->Submit())
return absl::nullopt;
return V4L2SubmittedRequestRef(self.request_);
}
bool V4L2SubmittedRequestRef::IsCompleted() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_NE(request_, nullptr);
return request_->IsCompleted();
}
V4L2RequestsQueue::V4L2RequestsQueue(base::ScopedFD&& media_fd) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
media_fd_ = std::move(media_fd);
}
V4L2RequestsQueue::~V4L2RequestsQueue() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
requests_.clear();
media_fd_.reset();
}
absl::optional<base::ScopedFD> V4L2RequestsQueue::CreateRequestFD() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
int request_fd;
int ret = HANDLE_EINTR(
ioctl(media_fd_.get(), MEDIA_IOC_REQUEST_ALLOC, &request_fd));
if (ret < 0) {
VPLOGF(1) << "Failed to create request";
return absl::nullopt;
}
return base::ScopedFD(request_fd);
}
absl::optional<V4L2RequestRef> V4L2RequestsQueue::GetFreeRequest() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
V4L2Request* request_ptr =
free_requests_.empty() ? nullptr : free_requests_.front();
if (request_ptr && request_ptr->IsCompleted()) {
// Previous request is already completed, just recycle it.
free_requests_.pop();
} else if (requests_.size() < kMaxNumRequests) {
// No request yet, or not completed, but we can allocate a new one.
auto request_fd = CreateRequestFD();
if (!request_fd.has_value()) {
VLOGF(1) << "Error while creating a new request FD!";
return absl::nullopt;
}
// Not using std::make_unique because constructor is private.
std::unique_ptr<V4L2Request> request(
new V4L2Request(std::move(*request_fd), this));
request_ptr = request.get();
requests_.push_back(std::move(request));
VLOGF(4) << "Allocated new request, total number: " << requests_.size();
} else {
// Request is not completed and we have reached the maximum number.
// Wait for it to complete.
VLOGF(1) << "Waiting for request completion. This probably means a "
<< "request is blocking.";
if (!request_ptr->WaitForCompletion()) {
VLOG(1) << "Timeout while waiting for request to complete.";
return absl::nullopt;
}
free_requests_.pop();
}
DCHECK(request_ptr);
if (!request_ptr->Reset()) {
VPLOGF(1) << "Failed to reset request";
return absl::nullopt;
}
return V4L2RequestRef(request_ptr);
}
void V4L2RequestsQueue::ReturnRequest(V4L2Request* request) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(request);
if (request)
free_requests_.push(request);
}
} // namespace media