blob: 57fe87a7cb63cf197a456a0aef492a2a76df69b6 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "media/gpu/generic_v4l2_device.h"
#include <errno.h>
#include <fcntl.h>
#include <libdrm/drm_fourcc.h>
#include <linux/videodev2.h>
#include <poll.h>
#include <string.h>
#include <sys/eventfd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <memory>
#include "base/files/scoped_file.h"
#include "base/macros.h"
#include "base/posix/eintr_wrapper.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "media/gpu/generic_v4l2_device.h"
#include "ui/gl/egl_util.h"
#include "ui/gl/gl_bindings.h"
#if defined(USE_LIBV4L2)
// Auto-generated for dlopen libv4l2 libraries
#include "media/gpu/v4l2_stubs.h"
#include "third_party/v4l-utils/lib/include/libv4l2.h"
using media_gpu::kModuleV4l2;
using media_gpu::InitializeStubs;
using media_gpu::StubPathMap;
static const base::FilePath::CharType kV4l2Lib[] =
FILE_PATH_LITERAL("/usr/lib/libv4l2.so");
#endif
namespace media {
namespace {
const char kDecoderDevice[] = "/dev/video-dec";
const char kEncoderDevice[] = "/dev/video-enc";
const char kImageProcessorDevice[] = "/dev/image-proc0";
const char kJpegDecoderDevice[] = "/dev/jpeg-dec";
}
GenericV4L2Device::GenericV4L2Device(Type type)
: V4L2Device(type), use_libv4l2_(false) {}
GenericV4L2Device::~GenericV4L2Device() {
#if defined(USE_LIBV4L2)
if (use_libv4l2_ && device_fd_.is_valid())
v4l2_close(device_fd_.release());
#endif
}
int GenericV4L2Device::Ioctl(int request, void* arg) {
#if defined(USE_LIBV4L2)
if (use_libv4l2_)
return HANDLE_EINTR(v4l2_ioctl(device_fd_.get(), request, arg));
#endif
return HANDLE_EINTR(ioctl(device_fd_.get(), request, arg));
}
bool GenericV4L2Device::Poll(bool poll_device, bool* event_pending) {
struct pollfd pollfds[2];
nfds_t nfds;
int pollfd = -1;
pollfds[0].fd = device_poll_interrupt_fd_.get();
pollfds[0].events = POLLIN | POLLERR;
nfds = 1;
if (poll_device) {
DVLOG(3) << "Poll(): adding device fd to poll() set";
pollfds[nfds].fd = device_fd_.get();
pollfds[nfds].events = POLLIN | POLLOUT | POLLERR | POLLPRI;
pollfd = nfds;
nfds++;
}
if (HANDLE_EINTR(poll(pollfds, nfds, -1)) == -1) {
DPLOG(ERROR) << "poll() failed";
return false;
}
*event_pending = (pollfd != -1 && pollfds[pollfd].revents & POLLPRI);
return true;
}
void* GenericV4L2Device::Mmap(void* addr,
unsigned int len,
int prot,
int flags,
unsigned int offset) {
return mmap(addr, len, prot, flags, device_fd_.get(), offset);
}
void GenericV4L2Device::Munmap(void* addr, unsigned int len) {
munmap(addr, len);
}
bool GenericV4L2Device::SetDevicePollInterrupt() {
DVLOG(3) << "SetDevicePollInterrupt()";
const uint64_t buf = 1;
if (HANDLE_EINTR(write(device_poll_interrupt_fd_.get(), &buf, sizeof(buf))) ==
-1) {
DPLOG(ERROR) << "SetDevicePollInterrupt(): write() failed";
return false;
}
return true;
}
bool GenericV4L2Device::ClearDevicePollInterrupt() {
DVLOG(3) << "ClearDevicePollInterrupt()";
uint64_t buf;
if (HANDLE_EINTR(read(device_poll_interrupt_fd_.get(), &buf, sizeof(buf))) ==
-1) {
if (errno == EAGAIN) {
// No interrupt flag set, and we're reading nonblocking. Not an error.
return true;
} else {
DPLOG(ERROR) << "ClearDevicePollInterrupt(): read() failed";
return false;
}
}
return true;
}
bool GenericV4L2Device::Initialize() {
const char* device_path = NULL;
static bool v4l2_functions_initialized = PostSandboxInitialization();
if (!v4l2_functions_initialized) {
LOG(ERROR) << "Failed to initialize LIBV4L2 libs";
return false;
}
switch (type_) {
case kDecoder:
device_path = kDecoderDevice;
break;
case kEncoder:
device_path = kEncoderDevice;
break;
case kImageProcessor:
device_path = kImageProcessorDevice;
break;
case kJpegDecoder:
device_path = kJpegDecoderDevice;
break;
}
DVLOG(2) << "Initialize(): opening device: " << device_path;
// Open the video device.
device_fd_.reset(
HANDLE_EINTR(open(device_path, O_RDWR | O_NONBLOCK | O_CLOEXEC)));
if (!device_fd_.is_valid()) {
return false;
}
#if defined(USE_LIBV4L2)
if (type_ == kEncoder &&
HANDLE_EINTR(v4l2_fd_open(device_fd_.get(), V4L2_DISABLE_CONVERSION)) !=
-1) {
DVLOG(2) << "Using libv4l2 for " << device_path;
use_libv4l2_ = true;
}
#endif
device_poll_interrupt_fd_.reset(eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC));
if (!device_poll_interrupt_fd_.is_valid()) {
return false;
}
return true;
}
std::vector<base::ScopedFD> GenericV4L2Device::GetDmabufsForV4L2Buffer(
int index,
size_t num_planes,
enum v4l2_buf_type type) {
DCHECK(V4L2_TYPE_IS_MULTIPLANAR(type));
std::vector<base::ScopedFD> dmabuf_fds;
for (size_t i = 0; i < num_planes; ++i) {
struct v4l2_exportbuffer expbuf;
memset(&expbuf, 0, sizeof(expbuf));
expbuf.type = type;
expbuf.index = index;
expbuf.plane = i;
expbuf.flags = O_CLOEXEC;
if (Ioctl(VIDIOC_EXPBUF, &expbuf) != 0) {
dmabuf_fds.clear();
break;
}
dmabuf_fds.push_back(base::ScopedFD(expbuf.fd));
}
return dmabuf_fds;
}
bool GenericV4L2Device::CanCreateEGLImageFrom(uint32_t v4l2_pixfmt) {
static uint32_t kEGLImageDrmFmtsSupported[] = {
DRM_FORMAT_ARGB8888,
#if defined(ARCH_CPU_ARMEL)
DRM_FORMAT_NV12,
#endif
};
return std::find(
kEGLImageDrmFmtsSupported,
kEGLImageDrmFmtsSupported + arraysize(kEGLImageDrmFmtsSupported),
V4L2PixFmtToDrmFormat(v4l2_pixfmt)) !=
kEGLImageDrmFmtsSupported + arraysize(kEGLImageDrmFmtsSupported);
}
EGLImageKHR GenericV4L2Device::CreateEGLImage(
EGLDisplay egl_display,
EGLContext /* egl_context */,
GLuint texture_id,
const gfx::Size& size,
unsigned int buffer_index,
uint32_t v4l2_pixfmt,
const std::vector<base::ScopedFD>& dmabuf_fds) {
DVLOG(3) << "CreateEGLImage()";
if (!CanCreateEGLImageFrom(v4l2_pixfmt)) {
LOG(ERROR) << "Unsupported V4L2 pixel format";
return EGL_NO_IMAGE_KHR;
}
media::VideoPixelFormat vf_format = V4L2PixFmtToVideoPixelFormat(v4l2_pixfmt);
// Number of components, as opposed to the number of V4L2 planes, which is
// just a buffer count.
size_t num_planes = media::VideoFrame::NumPlanes(vf_format);
DCHECK_LE(num_planes, 3u);
if (num_planes < dmabuf_fds.size()) {
// It's possible for more than one DRM plane to reside in one V4L2 plane,
// but not the other way around. We must use all V4L2 planes.
LOG(ERROR) << "Invalid plane count";
return EGL_NO_IMAGE_KHR;
}
std::vector<EGLint> attrs;
attrs.push_back(EGL_WIDTH);
attrs.push_back(size.width());
attrs.push_back(EGL_HEIGHT);
attrs.push_back(size.height());
attrs.push_back(EGL_LINUX_DRM_FOURCC_EXT);
attrs.push_back(V4L2PixFmtToDrmFormat(v4l2_pixfmt));
// For existing formats, if we have less buffers (V4L2 planes) than
// components (planes), the remaining planes are stored in the last
// V4L2 plane. Use one V4L2 plane per each component until we run out of V4L2
// planes, and use the last V4L2 plane for all remaining components, each
// with an offset equal to the size of the preceding planes in the same
// V4L2 plane.
size_t v4l2_plane = 0;
size_t plane_offset = 0;
for (size_t plane = 0; plane < num_planes; ++plane) {
attrs.push_back(EGL_DMA_BUF_PLANE0_FD_EXT + plane * 3);
attrs.push_back(dmabuf_fds[v4l2_plane].get());
attrs.push_back(EGL_DMA_BUF_PLANE0_OFFSET_EXT + plane * 3);
attrs.push_back(plane_offset);
attrs.push_back(EGL_DMA_BUF_PLANE0_PITCH_EXT + plane * 3);
attrs.push_back(
media::VideoFrame::RowBytes(plane, vf_format, size.width()));
if (v4l2_plane + 1 < dmabuf_fds.size()) {
++v4l2_plane;
plane_offset = 0;
} else {
plane_offset +=
media::VideoFrame::PlaneSize(vf_format, plane, size).GetArea();
}
}
attrs.push_back(EGL_NONE);
EGLImageKHR egl_image = eglCreateImageKHR(
egl_display, EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT, NULL, &attrs[0]);
if (egl_image == EGL_NO_IMAGE_KHR) {
LOG(ERROR) << "Failed creating EGL image: " << ui::GetLastEGLErrorString();
return egl_image;
}
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture_id);
glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, egl_image);
return egl_image;
}
EGLBoolean GenericV4L2Device::DestroyEGLImage(EGLDisplay egl_display,
EGLImageKHR egl_image) {
return eglDestroyImageKHR(egl_display, egl_image);
}
GLenum GenericV4L2Device::GetTextureTarget() {
return GL_TEXTURE_EXTERNAL_OES;
}
uint32_t GenericV4L2Device::PreferredInputFormat() {
// TODO(posciak): We should support "dontcare" returns here once we
// implement proper handling (fallback, negotiation) for this in users.
CHECK_EQ(type_, kEncoder);
return V4L2_PIX_FMT_NV12M;
}
// static
bool GenericV4L2Device::PostSandboxInitialization() {
#if defined(USE_LIBV4L2)
StubPathMap paths;
paths[kModuleV4l2].push_back(kV4l2Lib);
return InitializeStubs(paths);
#else
return true;
#endif
}
} // namespace media