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// Copyright 2017 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/capture/video/chromeos/local_gpu_memory_buffer_manager.h"
#include <drm_fourcc.h>
#include <xf86drm.h>
#include <memory>
namespace media {
namespace {
const int32_t kDrmNumNodes = 64;
const int32_t kMinNodeNumber = 128;
gbm_device* CreateGbmDevice() {
int fd;
int32_t min_node = kMinNodeNumber;
int32_t max_node = kMinNodeNumber + kDrmNumNodes;
struct gbm_device* gbm = nullptr;
for (int i = min_node; i < max_node; i++) {
fd = drmOpenRender(i);
if (fd < 0) {
continue;
}
drmVersionPtr version = drmGetVersion(fd);
if (!strcmp("vgem", version->name)) {
drmFreeVersion(version);
close(fd);
continue;
}
gbm = gbm_create_device(fd);
if (!gbm) {
drmFreeVersion(version);
close(fd);
continue;
}
VLOG(1) << "Opened gbm device on render node " << version->name;
drmFreeVersion(version);
return gbm;
}
return nullptr;
}
uint32_t GetDrmFormat(gfx::BufferFormat gfx_format) {
switch (gfx_format) {
case gfx::BufferFormat::R_8:
return DRM_FORMAT_R8;
case gfx::BufferFormat::YUV_420_BIPLANAR:
return DRM_FORMAT_NV12;
// Add more formats when needed.
default:
return 0;
}
}
class GpuMemoryBufferImplGbm : public gfx::GpuMemoryBuffer {
public:
GpuMemoryBufferImplGbm(gfx::BufferFormat format, gbm_bo* buffer_object)
: format_(format), buffer_object_(buffer_object), mapped_(false) {
handle_.type = gfx::NATIVE_PIXMAP;
// Set a dummy id since this is for testing only.
handle_.id = gfx::GpuMemoryBufferId(0);
handle_.native_pixmap_handle.fds.push_back(
base::FileDescriptor(gbm_bo_get_fd(buffer_object), false));
for (size_t i = 0; i < gbm_bo_get_num_planes(buffer_object); ++i) {
handle_.native_pixmap_handle.planes.push_back(
gfx::NativePixmapPlane(gbm_bo_get_plane_stride(buffer_object, i),
gbm_bo_get_plane_offset(buffer_object, i),
gbm_bo_get_plane_size(buffer_object, i)));
}
}
~GpuMemoryBufferImplGbm() override {
if (mapped_) {
Unmap();
}
close(gbm_bo_get_fd(buffer_object_));
gbm_bo_destroy(buffer_object_);
}
bool Map() override {
if (mapped_) {
return true;
}
size_t num_planes = gbm_bo_get_num_planes(buffer_object_);
uint32_t stride;
mapped_planes_.resize(num_planes);
for (size_t i = 0; i < num_planes; ++i) {
void* mapped_data;
void* addr =
gbm_bo_map(buffer_object_, 0, 0, gbm_bo_get_width(buffer_object_),
gbm_bo_get_height(buffer_object_),
GBM_BO_TRANSFER_READ_WRITE, &stride, &mapped_data, i);
if (!addr) {
LOG(ERROR) << "Failed to map GpuMemoryBufferImplGbm plane " << i;
Unmap();
return false;
}
mapped_planes_[i].addr = addr;
mapped_planes_[i].mapped_data = mapped_data;
}
mapped_ = true;
return true;
};
void* memory(size_t plane) override {
if (!mapped_) {
LOG(ERROR) << "Buffer is not mapped";
return nullptr;
}
if (plane > mapped_planes_.size()) {
LOG(ERROR) << "Invalid plane: " << plane;
return nullptr;
}
return mapped_planes_[plane].addr;
}
void Unmap() override {
for (size_t i = 0; i < mapped_planes_.size(); ++i) {
if (mapped_planes_[i].addr) {
gbm_bo_unmap(buffer_object_, mapped_planes_[i].mapped_data);
mapped_planes_[i].addr = nullptr;
mapped_planes_[i].mapped_data = nullptr;
}
}
mapped_planes_.clear();
mapped_ = false;
}
gfx::Size GetSize() const override {
return gfx::Size(gbm_bo_get_width(buffer_object_),
gbm_bo_get_height(buffer_object_));
}
gfx::BufferFormat GetFormat() const override { return format_; }
int stride(size_t plane) const override {
return gbm_bo_get_plane_stride(buffer_object_, plane);
}
void SetColorSpace(const gfx::ColorSpace& color_space) override {}
gfx::GpuMemoryBufferId GetId() const override { return handle_.id; }
gfx::GpuMemoryBufferHandle GetHandle() const override { return handle_; }
ClientBuffer AsClientBuffer() override {
return reinterpret_cast<ClientBuffer>(this);
}
private:
struct MappedPlane {
void* addr;
void* mapped_data;
};
gfx::BufferFormat format_;
gbm_bo* buffer_object_;
gfx::GpuMemoryBufferHandle handle_;
bool mapped_;
std::vector<MappedPlane> mapped_planes_;
DISALLOW_IMPLICIT_CONSTRUCTORS(GpuMemoryBufferImplGbm);
};
} // namespace
LocalGpuMemoryBufferManager::LocalGpuMemoryBufferManager()
: gbm_device_(CreateGbmDevice()) {}
LocalGpuMemoryBufferManager::~LocalGpuMemoryBufferManager() {
if (gbm_device_) {
close(gbm_device_get_fd(gbm_device_));
gbm_device_destroy(gbm_device_);
}
}
std::unique_ptr<gfx::GpuMemoryBuffer>
LocalGpuMemoryBufferManager::CreateGpuMemoryBuffer(
const gfx::Size& size,
gfx::BufferFormat format,
gfx::BufferUsage usage,
gpu::SurfaceHandle surface_handle) {
if (usage != gfx::BufferUsage::SCANOUT_CAMERA_READ_WRITE &&
usage != gfx::BufferUsage::CAMERA_AND_CPU_READ_WRITE) {
LOG(ERROR) << "Unsupported gfx::BufferUsage" << static_cast<int>(usage);
return std::unique_ptr<gfx::GpuMemoryBuffer>();
}
if (!gbm_device_) {
LOG(ERROR) << "Invalid GBM device";
return std::unique_ptr<gfx::GpuMemoryBuffer>();
}
uint32_t drm_format = GetDrmFormat(format);
uint32_t camera_gbm_usage =
GBM_BO_USE_LINEAR | GBM_BO_USE_CAMERA_READ | GBM_BO_USE_CAMERA_WRITE;
if (!drm_format) {
LOG(ERROR) << "Unable to convert gfx::BufferFormat "
<< static_cast<int>(format) << " to DRM format";
return std::unique_ptr<gfx::GpuMemoryBuffer>();
}
if (!gbm_device_is_format_supported(gbm_device_, drm_format,
camera_gbm_usage)) {
return std::unique_ptr<gfx::GpuMemoryBuffer>();
}
gbm_bo* buffer_object = gbm_bo_create(
gbm_device_, size.width(), size.height(), drm_format, camera_gbm_usage);
if (!buffer_object) {
LOG(ERROR) << "Failed to create GBM buffer object";
return std::unique_ptr<gfx::GpuMemoryBuffer>();
}
return std::make_unique<GpuMemoryBufferImplGbm>(format, buffer_object);
}
void LocalGpuMemoryBufferManager::SetDestructionSyncToken(
gfx::GpuMemoryBuffer* buffer,
const gpu::SyncToken& sync_token) {}
} // namespace media
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