From 5fbece9fa1763af70c9e4346af2ac10b0dec0af7 Mon Sep 17 00:00:00 2001
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From: Jeffy Chen <jeffy.chen@rock-chips.com>
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Date: Mon, 1 Jul 2019 10:37:35 +0800
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Subject: [PATCH 03/17] media: capture: linux: Support libv4l2 plugins
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Allow using libv4l2 plugins for linux v4l2 capture devices.
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Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
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---
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media/capture/BUILD.gn | 14 +++++
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.../video/linux/v4l2_capture_device_impl.cc | 52 ++++++++++++++++++-
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.../video/linux/v4l2_capture_device_impl.h | 11 ++++
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3 files changed, 76 insertions(+), 1 deletion(-)
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diff --git a/media/capture/BUILD.gn b/media/capture/BUILD.gn
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index 3f80b62cb..3c6559339 100644
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--- a/media/capture/BUILD.gn
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+++ b/media/capture/BUILD.gn
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@@ -2,6 +2,7 @@
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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+import("//build/buildflag_header.gni")
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import("//build/config/chromeos/ui_mode.gni")
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import("//build/config/features.gni")
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import("//build/config/ui.gni")
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@@ -18,6 +19,14 @@ group("capture") {
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]
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}
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+buildflag_header("buildflags") {
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+ header = "buildflags.h"
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+
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+ flags = [
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+ "USE_LIBV4L2=$use_v4lplugin",
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+ ]
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+}
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+
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component("capture_switches") {
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defines = [ "CAPTURE_IMPLEMENTATION" ]
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sources = [
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@@ -266,6 +275,11 @@ component("capture_lib") {
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"video/linux/video_capture_device_linux.cc",
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"video/linux/video_capture_device_linux.h",
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]
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+ public_deps += [ ":buildflags" ]
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+
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+ if (use_v4lplugin) {
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+ deps += [ "//media/gpu/v4l2:libv4l2_stubs" ]
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+ }
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}
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if (is_chromeos_ash) {
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diff --git a/media/capture/video/linux/v4l2_capture_device_impl.cc b/media/capture/video/linux/v4l2_capture_device_impl.cc
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index c9040f5de..d05d1179e 100644
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--- a/media/capture/video/linux/v4l2_capture_device_impl.cc
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+++ b/media/capture/video/linux/v4l2_capture_device_impl.cc
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@@ -10,19 +10,61 @@
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#include <sys/poll.h>
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#include <unistd.h>
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+#if BUILDFLAG(USE_LIBV4L2)
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+// Auto-generated for dlopen libv4l2 libraries
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+#include "media/gpu/v4l2/v4l2_stubs.h"
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+#include "third_party/v4l-utils/lib/include/libv4l2.h"
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+
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+#include "base/files/file_path.h"
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+
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+using media_gpu_v4l2::kModuleV4l2;
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+using media_gpu_v4l2::InitializeStubs;
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+using media_gpu_v4l2::StubPathMap;
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+
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+static const base::FilePath::CharType kV4l2Lib[] =
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+ FILE_PATH_LITERAL("/usr/lib/libv4l2.so");
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+#endif
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+
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namespace media {
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V4L2CaptureDeviceImpl::~V4L2CaptureDeviceImpl() = default;
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+V4L2CaptureDeviceImpl::V4L2CaptureDeviceImpl() {
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+#if BUILDFLAG(USE_LIBV4L2)
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+ StubPathMap paths;
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+ paths[kModuleV4l2].push_back(kV4l2Lib);
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+
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+ has_libv4l2_ = InitializeStubs(paths);
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+#endif
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+}
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+
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int V4L2CaptureDeviceImpl::open(const char* device_name, int flags) {
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- return ::open(device_name, flags);
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+ int fd = ::open64(device_name, flags);
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+ if (fd < 0)
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+ return fd;
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+
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+#if BUILDFLAG(USE_LIBV4L2)
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+ use_libv4l2_ = false;
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+ if (has_libv4l2_ && v4l2_fd_open(fd, V4L2_DISABLE_CONVERSION) != -1) {
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+ use_libv4l2_ = true;
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+ }
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+#endif
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+ return fd;
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}
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int V4L2CaptureDeviceImpl::close(int fd) {
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+#if BUILDFLAG(USE_LIBV4L2)
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+ if (use_libv4l2_)
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+ return v4l2_close(fd);
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+#endif
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return ::close(fd);
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}
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int V4L2CaptureDeviceImpl::ioctl(int fd, int request, void* argp) {
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+#if BUILDFLAG(USE_LIBV4L2)
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+ if (use_libv4l2_)
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+ return v4l2_ioctl(fd, request, argp);
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+#endif
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return ::ioctl(fd, request, argp);
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}
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@@ -32,10 +74,18 @@ void* V4L2CaptureDeviceImpl::mmap(void* start,
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int flags,
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int fd,
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off_t offset) {
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+#if BUILDFLAG(USE_LIBV4L2)
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+ if (use_libv4l2_)
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+ return v4l2_mmap(start, length, prot, flags, fd, offset);
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+#endif
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return ::mmap(start, length, prot, flags, fd, offset);
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}
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int V4L2CaptureDeviceImpl::munmap(void* start, size_t length) {
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+#if BUILDFLAG(USE_LIBV4L2)
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+ if (use_libv4l2_)
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+ return v4l2_munmap(start, length);
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+#endif
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return ::munmap(start, length);
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}
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diff --git a/media/capture/video/linux/v4l2_capture_device_impl.h b/media/capture/video/linux/v4l2_capture_device_impl.h
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index 936c8b093..f96c2d434 100644
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--- a/media/capture/video/linux/v4l2_capture_device_impl.h
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+++ b/media/capture/video/linux/v4l2_capture_device_impl.h
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@@ -8,6 +8,7 @@
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#include <poll.h>
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#include <sys/fcntl.h>
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+#include "media/capture/buildflags.h"
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#include "media/capture/capture_export.h"
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#include "media/capture/video/linux/v4l2_capture_device.h"
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@@ -17,6 +18,8 @@ namespace media {
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// V4L2 APIs.
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class CAPTURE_EXPORT V4L2CaptureDeviceImpl : public V4L2CaptureDevice {
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public:
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+ V4L2CaptureDeviceImpl();
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+
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int open(const char* device_name, int flags) override;
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int close(int fd) override;
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int ioctl(int fd, int request, void* argp) override;
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@@ -32,6 +35,14 @@ class CAPTURE_EXPORT V4L2CaptureDeviceImpl : public V4L2CaptureDevice {
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private:
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~V4L2CaptureDeviceImpl() override;
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+
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+#if BUILDFLAG(USE_LIBV4L2)
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+ // Has libv4l2.
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+ bool has_libv4l2_;
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+ // Use libv4l2 when operating |fd|.
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+ bool use_libv4l2_;
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+#endif
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+
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};
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} // namespace media
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--
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2.20.1
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