// Copyright 2013 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 "cc/resources/video_resource_updater.h"

#include <stddef.h>
#include <stdint.h>

#include <algorithm>

#include "base/bind.h"
#include "base/bit_cast.h"
#include "base/trace_event/trace_event.h"
#include "cc/base/math_util.h"
#include "cc/output/gl_renderer.h"
#include "cc/resources/resource_provider.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "media/base/video_frame.h"
#include "media/renderers/skcanvas_video_renderer.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/gfx/geometry/size_conversions.h"

namespace cc {

namespace {

const ResourceFormat kRGBResourceFormat = RGBA_8888;

VideoFrameExternalResources::ResourceType ResourceTypeForVideoFrame(
    media::VideoFrame* video_frame) {
  switch (video_frame->format()) {
    case media::PIXEL_FORMAT_ARGB:
    case media::PIXEL_FORMAT_XRGB:
    case media::PIXEL_FORMAT_UYVY:
      switch (video_frame->mailbox_holder(0).texture_target) {
        case GL_TEXTURE_2D:
          return (video_frame->format() == media::PIXEL_FORMAT_XRGB)
                     ? VideoFrameExternalResources::RGB_RESOURCE
                     : VideoFrameExternalResources::RGBA_PREMULTIPLIED_RESOURCE;
        case GL_TEXTURE_EXTERNAL_OES:
          return video_frame->metadata()->IsTrue(
                     media::VideoFrameMetadata::COPY_REQUIRED)
                     ? VideoFrameExternalResources::RGBA_RESOURCE
                     : VideoFrameExternalResources::STREAM_TEXTURE_RESOURCE;
        case GL_TEXTURE_RECTANGLE_ARB:
          return VideoFrameExternalResources::RGB_RESOURCE;
        default:
          NOTREACHED();
          break;
      }
      break;
    case media::PIXEL_FORMAT_I420:
      return VideoFrameExternalResources::YUV_RESOURCE;
      break;
    case media::PIXEL_FORMAT_NV12:
      switch (video_frame->mailbox_holder(0).texture_target) {
        case GL_TEXTURE_EXTERNAL_OES:
          return VideoFrameExternalResources::YUV_RESOURCE;
        case GL_TEXTURE_RECTANGLE_ARB:
          return VideoFrameExternalResources::RGB_RESOURCE;
        default:
          NOTREACHED();
          break;
      }
      break;
    case media::PIXEL_FORMAT_YV12:
    case media::PIXEL_FORMAT_YV16:
    case media::PIXEL_FORMAT_YV24:
    case media::PIXEL_FORMAT_YV12A:
    case media::PIXEL_FORMAT_NV21:
    case media::PIXEL_FORMAT_YUY2:
    case media::PIXEL_FORMAT_RGB24:
    case media::PIXEL_FORMAT_RGB32:
    case media::PIXEL_FORMAT_MJPEG:
    case media::PIXEL_FORMAT_MT21:
    case media::PIXEL_FORMAT_YUV420P9:
    case media::PIXEL_FORMAT_YUV422P9:
    case media::PIXEL_FORMAT_YUV444P9:
    case media::PIXEL_FORMAT_YUV420P10:
    case media::PIXEL_FORMAT_YUV422P10:
    case media::PIXEL_FORMAT_YUV444P10:
    case media::PIXEL_FORMAT_UNKNOWN:
      break;
  }
  return VideoFrameExternalResources::NONE;
}

class SyncTokenClientImpl : public media::VideoFrame::SyncTokenClient {
 public:
  SyncTokenClientImpl(gpu::gles2::GLES2Interface* gl,
                      const gpu::SyncToken& sync_token)
      : gl_(gl), sync_token_(sync_token) {}
  ~SyncTokenClientImpl() override {}
  void GenerateSyncToken(gpu::SyncToken* sync_token) override {
    if (sync_token_.HasData()) {
      *sync_token = sync_token_;
    } else {
      const uint64_t fence_sync = gl_->InsertFenceSyncCHROMIUM();
      gl_->ShallowFlushCHROMIUM();
      gl_->GenSyncTokenCHROMIUM(fence_sync, sync_token->GetData());
    }
  }
  void WaitSyncToken(const gpu::SyncToken& sync_token) override {
    if (sync_token.HasData()) {
      gl_->WaitSyncTokenCHROMIUM(sync_token.GetConstData());
      if (sync_token_.HasData() && sync_token_ != sync_token) {
        gl_->WaitSyncTokenCHROMIUM(sync_token_.GetConstData());
        sync_token_.Clear();
      }
    }
  }

 private:
  gpu::gles2::GLES2Interface* gl_;
  gpu::SyncToken sync_token_;
};

}  // namespace

VideoResourceUpdater::PlaneResource::PlaneResource(
    unsigned int resource_id,
    const gfx::Size& resource_size,
    ResourceFormat resource_format,
    gpu::Mailbox mailbox)
    : resource_id_(resource_id),
      resource_size_(resource_size),
      resource_format_(resource_format),
      mailbox_(mailbox) {}

VideoResourceUpdater::PlaneResource::PlaneResource(const PlaneResource& other) =
    default;

bool VideoResourceUpdater::PlaneResource::Matches(int unique_frame_id,
                                                  size_t plane_index) {
  return has_unique_frame_id_and_plane_index_ &&
         unique_frame_id_ == unique_frame_id && plane_index_ == plane_index;
}

void VideoResourceUpdater::PlaneResource::SetUniqueId(int unique_frame_id,
                                                      size_t plane_index) {
  DCHECK_EQ(ref_count_, 1);
  plane_index_ = plane_index;
  unique_frame_id_ = unique_frame_id;
  has_unique_frame_id_and_plane_index_ = true;
}

VideoFrameExternalResources::VideoFrameExternalResources()
    : type(NONE),
      read_lock_fences_enabled(false),
      offset(0.0f),
      multiplier(1.0f),
      bits_per_channel(8) {}

VideoFrameExternalResources::VideoFrameExternalResources(
    const VideoFrameExternalResources& other) = default;

VideoFrameExternalResources::~VideoFrameExternalResources() {}

VideoResourceUpdater::VideoResourceUpdater(ContextProvider* context_provider,
                                           ResourceProvider* resource_provider)
    : context_provider_(context_provider),
      resource_provider_(resource_provider) {
}

VideoResourceUpdater::~VideoResourceUpdater() {
  for (const PlaneResource& plane_resource : all_resources_)
    resource_provider_->DeleteResource(plane_resource.resource_id());
}

VideoResourceUpdater::ResourceList::iterator
VideoResourceUpdater::AllocateResource(const gfx::Size& plane_size,
                                       ResourceFormat format,
                                       const gfx::ColorSpace& color_space,
                                       bool has_mailbox,
                                       bool immutable_hint) {
  // TODO(danakj): Abstract out hw/sw resource create/delete from
  // ResourceProvider and stop using ResourceProvider in this class.
  const ResourceId resource_id = resource_provider_->CreateResource(
      plane_size, immutable_hint ? ResourceProvider::TEXTURE_HINT_IMMUTABLE
                                 : ResourceProvider::TEXTURE_HINT_DEFAULT,
      format, color_space);
  if (resource_id == 0)
    return all_resources_.end();

  gpu::Mailbox mailbox;
  if (has_mailbox) {
    DCHECK(context_provider_);

    gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();

    gl->GenMailboxCHROMIUM(mailbox.name);
    ResourceProvider::ScopedWriteLockGL lock(resource_provider_, resource_id,
                                             false);
    gl->ProduceTextureDirectCHROMIUM(
        lock.texture_id(),
        resource_provider_->GetResourceTextureTarget(resource_id),
        mailbox.name);
  }
  all_resources_.push_front(
      PlaneResource(resource_id, plane_size, format, mailbox));
  return all_resources_.begin();
}

void VideoResourceUpdater::DeleteResource(ResourceList::iterator resource_it) {
  DCHECK(!resource_it->has_refs());
  resource_provider_->DeleteResource(resource_it->resource_id());
  all_resources_.erase(resource_it);
}

VideoFrameExternalResources
VideoResourceUpdater::CreateExternalResourcesFromVideoFrame(
    scoped_refptr<media::VideoFrame> video_frame) {
#if defined(VIDEO_HOLE)
  if (video_frame->storage_type() == media::VideoFrame::STORAGE_HOLE) {
    VideoFrameExternalResources external_resources;
    external_resources.type = VideoFrameExternalResources::HOLE;
    return external_resources;
  }
#endif  // defined(VIDEO_HOLE)
  if (video_frame->format() == media::PIXEL_FORMAT_UNKNOWN)
    return VideoFrameExternalResources();
  DCHECK(video_frame->HasTextures() || video_frame->IsMappable());
  if (video_frame->HasTextures())
    return CreateForHardwarePlanes(std::move(video_frame));
  else
    return CreateForSoftwarePlanes(std::move(video_frame));
}

// For frames that we receive in software format, determine the dimensions of
// each plane in the frame.
static gfx::Size SoftwarePlaneDimension(media::VideoFrame* input_frame,
                                        bool software_compositor,
                                        size_t plane_index) {
  gfx::Size coded_size = input_frame->coded_size();
  if (software_compositor)
    return coded_size;

  int plane_width = media::VideoFrame::Columns(
      plane_index, input_frame->format(), coded_size.width());
  int plane_height = media::VideoFrame::Rows(plane_index, input_frame->format(),
                                             coded_size.height());
  return gfx::Size(plane_width, plane_height);
}

VideoFrameExternalResources VideoResourceUpdater::CreateForSoftwarePlanes(
    scoped_refptr<media::VideoFrame> video_frame) {
  TRACE_EVENT0("cc", "VideoResourceUpdater::CreateForSoftwarePlanes");
  const media::VideoPixelFormat input_frame_format = video_frame->format();

  // TODO(hubbe): Make this a video frame method.
  int bits_per_channel = 0;
  switch (input_frame_format) {
    case media::PIXEL_FORMAT_UNKNOWN:
      NOTREACHED();
    // Fall through!
    case media::PIXEL_FORMAT_I420:
    case media::PIXEL_FORMAT_YV12:
    case media::PIXEL_FORMAT_YV16:
    case media::PIXEL_FORMAT_YV12A:
    case media::PIXEL_FORMAT_YV24:
    case media::PIXEL_FORMAT_NV12:
    case media::PIXEL_FORMAT_NV21:
    case media::PIXEL_FORMAT_UYVY:
    case media::PIXEL_FORMAT_YUY2:
    case media::PIXEL_FORMAT_ARGB:
    case media::PIXEL_FORMAT_XRGB:
    case media::PIXEL_FORMAT_RGB24:
    case media::PIXEL_FORMAT_RGB32:
    case media::PIXEL_FORMAT_MJPEG:
    case media::PIXEL_FORMAT_MT21:
      bits_per_channel = 8;
      break;
    case media::PIXEL_FORMAT_YUV420P9:
    case media::PIXEL_FORMAT_YUV422P9:
    case media::PIXEL_FORMAT_YUV444P9:
      bits_per_channel = 9;
      break;
    case media::PIXEL_FORMAT_YUV420P10:
    case media::PIXEL_FORMAT_YUV422P10:
    case media::PIXEL_FORMAT_YUV444P10:
      bits_per_channel = 10;
      break;
  }

  // Only YUV software video frames are supported.
  if (!media::IsYuvPlanar(input_frame_format)) {
    NOTREACHED() << media::VideoPixelFormatToString(input_frame_format);
    return VideoFrameExternalResources();
  }

  const bool software_compositor = context_provider_ == NULL;

  ResourceFormat output_resource_format =
      resource_provider_->YuvResourceFormat(bits_per_channel);

  size_t output_plane_count = media::VideoFrame::NumPlanes(input_frame_format);

  // TODO(skaslev): If we're in software compositing mode, we do the YUV -> RGB
  // conversion here. That involves an extra copy of each frame to a bitmap.
  // Obviously, this is suboptimal and should be addressed once ubercompositor
  // starts shaping up.
  if (software_compositor) {
    output_resource_format = kRGBResourceFormat;
    output_plane_count = 1;
  }

  // Drop recycled resources that are the wrong format.
  for (auto it = all_resources_.begin(); it != all_resources_.end();) {
    if (!it->has_refs() && it->resource_format() != output_resource_format)
      DeleteResource(it++);
    else
      ++it;
  }

  const int max_resource_size = resource_provider_->max_texture_size();
  std::vector<ResourceList::iterator> plane_resources;
  for (size_t i = 0; i < output_plane_count; ++i) {
    gfx::Size output_plane_resource_size =
        SoftwarePlaneDimension(video_frame.get(), software_compositor, i);
    if (output_plane_resource_size.IsEmpty() ||
        output_plane_resource_size.width() > max_resource_size ||
        output_plane_resource_size.height() > max_resource_size) {
      break;
    }

    // Try recycle a previously-allocated resource.
    ResourceList::iterator resource_it = all_resources_.end();
    for (auto it = all_resources_.begin(); it != all_resources_.end(); ++it) {
      if (it->resource_size() == output_plane_resource_size &&
          it->resource_format() == output_resource_format) {
        if (it->Matches(video_frame->unique_id(), i)) {
          // Bingo, we found a resource that already contains the data we are
          // planning to put in it. It's safe to reuse it even if
          // resource_provider_ holds some references to it, because those
          // references are read-only.
          resource_it = it;
          break;
        }

        // This extra check is needed because resources backed by SharedMemory
        // are not ref-counted, unlike mailboxes. Full discussion in
        // codereview.chromium.org/145273021.
        const bool in_use =
            software_compositor &&
            resource_provider_->InUseByConsumer(it->resource_id());
        if (!it->has_refs() && !in_use) {
          // We found a resource with the correct size that we can overwrite.
          resource_it = it;
        }
      }
    }

    // Check if we need to allocate a new resource.
    if (resource_it == all_resources_.end()) {
      const bool is_immutable = true;
      resource_it = AllocateResource(
          output_plane_resource_size, output_resource_format,
          video_frame->ColorSpace(), !software_compositor, is_immutable);
    }
    if (resource_it == all_resources_.end())
      break;

    resource_it->add_ref();
    plane_resources.push_back(resource_it);
  }

  if (plane_resources.size() != output_plane_count) {
    // Allocation failed, nothing will be returned so restore reference counts.
    for (ResourceList::iterator resource_it : plane_resources)
      resource_it->remove_ref();
    return VideoFrameExternalResources();
  }

  VideoFrameExternalResources external_resources;

  external_resources.bits_per_channel = bits_per_channel;

  if (software_compositor) {
    DCHECK_EQ(plane_resources.size(), 1u);
    PlaneResource& plane_resource = *plane_resources[0];
    DCHECK_EQ(plane_resource.resource_format(), kRGBResourceFormat);
    DCHECK(plane_resource.mailbox().IsZero());

    if (!plane_resource.Matches(video_frame->unique_id(), 0)) {
      // We need to transfer data from |video_frame| to the plane resource.
      if (!video_renderer_)
        video_renderer_.reset(new media::SkCanvasVideoRenderer);

      ResourceProvider::ScopedWriteLockSoftware lock(
          resource_provider_, plane_resource.resource_id());
      SkCanvas canvas(lock.sk_bitmap());
      // This is software path, so canvas and video_frame are always backed
      // by software.
      video_renderer_->Copy(video_frame, &canvas, media::Context3D());
      plane_resource.SetUniqueId(video_frame->unique_id(), 0);
    }

    external_resources.software_resources.push_back(
        plane_resource.resource_id());
    external_resources.software_release_callback =
        base::Bind(&RecycleResource, AsWeakPtr(), plane_resource.resource_id());
    external_resources.type = VideoFrameExternalResources::SOFTWARE_RESOURCE;
    return external_resources;
  }

  for (size_t i = 0; i < plane_resources.size(); ++i) {
    PlaneResource& plane_resource = *plane_resources[i];
    // Update each plane's resource id with its content.
    DCHECK_EQ(plane_resource.resource_format(),
              resource_provider_->YuvResourceFormat(bits_per_channel));

    if (!plane_resource.Matches(video_frame->unique_id(), i)) {
      // We need to transfer data from |video_frame| to the plane resource.
      // TODO(reveman): Can use GpuMemoryBuffers here to improve performance.

      // The |resource_size_pixels| is the size of the resource we want to
      // upload to.
      gfx::Size resource_size_pixels = plane_resource.resource_size();
      // The |video_stride_bytes| is the width of the video frame we are
      // uploading (including non-frame data to fill in the stride).
      int video_stride_bytes = video_frame->stride(i);

      size_t bytes_per_row = ResourceUtil::UncheckedWidthInBytes<size_t>(
          resource_size_pixels.width(), plane_resource.resource_format());
      // Use 4-byte row alignment (OpenGL default) for upload performance.
      // Assuming that GL_UNPACK_ALIGNMENT has not changed from default.
      size_t upload_image_stride =
          MathUtil::UncheckedRoundUp<size_t>(bytes_per_row, 4u);

      bool needs_conversion = false;
      int shift = 0;

      // LUMINANCE_F16 uses half-floats, so we always need a conversion step.
      if (plane_resource.resource_format() == LUMINANCE_F16) {
        needs_conversion = true;
        // Note that the current method of converting integers to half-floats
        // stops working if you have more than 10 bits of data.
        DCHECK_LE(bits_per_channel, 10);
      } else if (bits_per_channel > 8) {
        // If bits_per_channel > 8 and we can't use LUMINANCE_F16, we need to
        // shift the data down and create an 8-bit texture.
        needs_conversion = true;
        shift = bits_per_channel - 8;
      }
      const uint8_t* pixels;
      if (static_cast<int>(upload_image_stride) == video_stride_bytes &&
          !needs_conversion) {
        pixels = video_frame->data(i);
      } else {
        // Avoid malloc for each frame/plane if possible.
        size_t needed_size =
            upload_image_stride * resource_size_pixels.height();
        if (upload_pixels_.size() < needed_size)
          upload_pixels_.resize(needed_size);

        for (int row = 0; row < resource_size_pixels.height(); ++row) {
          if (plane_resource.resource_format() == LUMINANCE_F16) {
            uint16_t* dst = reinterpret_cast<uint16_t*>(
                &upload_pixels_[upload_image_stride * row]);
            const uint16_t* src = reinterpret_cast<uint16_t*>(
                video_frame->data(i) + (video_stride_bytes * row));
            // Micro-benchmarking indicates that the compiler does
            // a good enough job of optimizing this loop that trying
            // to manually operate on one uint64 at a time is not
            // actually helpful.
            // Note to future optimizers: Benchmark your optimizations!
            for (size_t i = 0; i < bytes_per_row / 2; i++)
              dst[i] = src[i] | 0x3800;
          } else if (shift != 0) {
            // We have more-than-8-bit input which we need to shift
            // down to fit it into an 8-bit texture.
            uint8_t* dst = &upload_pixels_[upload_image_stride * row];
            const uint16_t* src = reinterpret_cast<uint16_t*>(
                video_frame->data(i) + (video_stride_bytes * row));
            for (size_t i = 0; i < bytes_per_row; i++)
              dst[i] = src[i] >> shift;
          } else {
            // Input and output are the same size and format, but
            // differ in stride, copy one row at a time.
            uint8_t* dst = &upload_pixels_[upload_image_stride * row];
            const uint8_t* src =
                video_frame->data(i) + (video_stride_bytes * row);
            memcpy(dst, src, bytes_per_row);
          }
        }
        pixels = &upload_pixels_[0];
      }

      resource_provider_->CopyToResource(plane_resource.resource_id(), pixels,
                                         resource_size_pixels);
      plane_resource.SetUniqueId(video_frame->unique_id(), i);
    }

    if (plane_resource.resource_format() == LUMINANCE_F16) {
      // By OR-ing with 0x3800, 10-bit numbers become half-floats in the
      // range [0.5..1) and 9-bit numbers get the range [0.5..0.75).
      //
      // Half-floats are evaluated as:
      // float value = pow(2.0, exponent - 25) * (0x400 + fraction);
      //
      // In our case the exponent is 14 (since we or with 0x3800) and
      // pow(2.0, 14-25) * 0x400 evaluates to 0.5 (our offset) and
      // pow(2.0, 14-25) * fraction is [0..0.49951171875] for 10-bit and
      // [0..0.24951171875] for 9-bit.
      //
      // (https://en.wikipedia.org/wiki/Half-precision_floating-point_format)
      //
      // PLEASE NOTE: This doesn't work if bits_per_channel is > 10.
      // PLEASE NOTE: All planes are assumed to use the same multiplier/offset.
      external_resources.offset = 0.5f;
      // Max value from input data.
      int max_input_value = (1 << bits_per_channel) - 1;
      // 2 << 11 = 2048 would be 1.0 with our exponent.
      external_resources.multiplier = 2048.0 / max_input_value;
    }

    TextureMailbox mailbox(plane_resource.mailbox(), gpu::SyncToken(),
                           resource_provider_->GetResourceTextureTarget(
                               plane_resource.resource_id()));
    mailbox.set_color_space(video_frame->ColorSpace());
    external_resources.mailboxes.push_back(mailbox);
    external_resources.release_callbacks.push_back(base::Bind(
        &RecycleResource, AsWeakPtr(), plane_resource.resource_id()));
  }

  external_resources.type = VideoFrameExternalResources::YUV_RESOURCE;
  return external_resources;
}

// static
void VideoResourceUpdater::ReturnTexture(
    base::WeakPtr<VideoResourceUpdater> updater,
    const scoped_refptr<media::VideoFrame>& video_frame,
    const gpu::SyncToken& sync_token,
    bool lost_resource,
    BlockingTaskRunner* main_thread_task_runner) {
  // TODO(dshwang) this case should be forwarded to the decoder as lost
  // resource.
  if (lost_resource || !updater.get())
    return;
  // Update the release sync point in |video_frame| with |sync_token|
  // returned by the compositor and emit a WaitSyncTokenCHROMIUM on
  // |video_frame|'s previous sync point using the current GL context.
  SyncTokenClientImpl client(updater->context_provider_->ContextGL(),
                             sync_token);
  video_frame->UpdateReleaseSyncToken(&client);
}

// Create a copy of a texture-backed source video frame in a new GL_TEXTURE_2D
// texture.
void VideoResourceUpdater::CopyPlaneTexture(
    media::VideoFrame* video_frame,
    const gpu::MailboxHolder& mailbox_holder,
    VideoFrameExternalResources* external_resources) {
  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
  SyncTokenClientImpl client(gl, mailbox_holder.sync_token);

  const gfx::Size output_plane_resource_size = video_frame->coded_size();
  // The copy needs to be a direct transfer of pixel data, so we use an RGBA8
  // target to avoid loss of precision or dropping any alpha component.
  const ResourceFormat copy_target_format = ResourceFormat::RGBA_8888;

  // Search for an existing resource to reuse.
  VideoResourceUpdater::ResourceList::iterator resource = all_resources_.end();

  for (auto it = all_resources_.begin(); it != all_resources_.end(); ++it) {
    // Reuse resource if attributes match and the resource is a currently
    // unreferenced texture.
    if (it->resource_size() == output_plane_resource_size &&
        it->resource_format() == copy_target_format &&
        !it->mailbox().IsZero() && !it->has_refs() &&
        resource_provider_->GetTextureHint(it->resource_id()) !=
            ResourceProvider::TEXTURE_HINT_IMMUTABLE) {
      resource = it;
      break;
    }
  }

  // Otherwise allocate a new resource.
  if (resource == all_resources_.end()) {
    const bool is_immutable = false;
    resource = AllocateResource(output_plane_resource_size, copy_target_format,
                                video_frame->ColorSpace(), true, is_immutable);
  }

  resource->add_ref();

  ResourceProvider::ScopedWriteLockGL lock(resource_provider_,
                                           resource->resource_id(), false);
  DCHECK_EQ(
      resource_provider_->GetResourceTextureTarget(resource->resource_id()),
      (GLenum)GL_TEXTURE_2D);

  gl->WaitSyncTokenCHROMIUM(mailbox_holder.sync_token.GetConstData());
  uint32_t src_texture_id = gl->CreateAndConsumeTextureCHROMIUM(
      mailbox_holder.texture_target, mailbox_holder.mailbox.name);
  gl->CopySubTextureCHROMIUM(src_texture_id, lock.texture_id(), 0, 0, 0, 0,
                             output_plane_resource_size.width(),
                             output_plane_resource_size.height(), false, false,
                             false);
  gl->DeleteTextures(1, &src_texture_id);

  // Sync point for use of frame copy.
  gpu::SyncToken sync_token;
  const uint64_t fence_sync = gl->InsertFenceSyncCHROMIUM();
  gl->ShallowFlushCHROMIUM();
  gl->GenSyncTokenCHROMIUM(fence_sync, sync_token.GetData());

  // Done with the source video frame texture at this point.
  video_frame->UpdateReleaseSyncToken(&client);

  TextureMailbox mailbox(resource->mailbox(), sync_token, GL_TEXTURE_2D,
                         video_frame->coded_size(), false, false);
  mailbox.set_color_space(video_frame->ColorSpace());
  external_resources->mailboxes.push_back(mailbox);

  external_resources->release_callbacks.push_back(
      base::Bind(&RecycleResource, AsWeakPtr(), resource->resource_id()));
}

VideoFrameExternalResources VideoResourceUpdater::CreateForHardwarePlanes(
    scoped_refptr<media::VideoFrame> video_frame) {
  TRACE_EVENT0("cc", "VideoResourceUpdater::CreateForHardwarePlanes");
  DCHECK(video_frame->HasTextures());
  if (!context_provider_)
    return VideoFrameExternalResources();

  VideoFrameExternalResources external_resources;
  if (video_frame->metadata()->IsTrue(
          media::VideoFrameMetadata::READ_LOCK_FENCES_ENABLED)) {
    external_resources.read_lock_fences_enabled = true;
  }

  external_resources.type = ResourceTypeForVideoFrame(video_frame.get());
  if (external_resources.type == VideoFrameExternalResources::NONE) {
    DLOG(ERROR) << "Unsupported Texture format"
                << media::VideoPixelFormatToString(video_frame->format());
    return external_resources;
  }

  const size_t num_planes = media::VideoFrame::NumPlanes(video_frame->format());
  for (size_t i = 0; i < num_planes; ++i) {
    const gpu::MailboxHolder& mailbox_holder = video_frame->mailbox_holder(i);
    if (mailbox_holder.mailbox.IsZero())
      break;

    if (video_frame->metadata()->IsTrue(
            media::VideoFrameMetadata::COPY_REQUIRED)) {
      CopyPlaneTexture(video_frame.get(), mailbox_holder, &external_resources);
    } else {
      TextureMailbox mailbox(mailbox_holder.mailbox, mailbox_holder.sync_token,
                             mailbox_holder.texture_target,
                             video_frame->coded_size(),
                             video_frame->metadata()->IsTrue(
                                 media::VideoFrameMetadata::ALLOW_OVERLAY),
                             false);
      mailbox.set_color_space(video_frame->ColorSpace());
      external_resources.mailboxes.push_back(mailbox);
      external_resources.release_callbacks.push_back(
          base::Bind(&ReturnTexture, AsWeakPtr(), video_frame));
    }
  }
  return external_resources;
}

// static
void VideoResourceUpdater::RecycleResource(
    base::WeakPtr<VideoResourceUpdater> updater,
    ResourceId resource_id,
    const gpu::SyncToken& sync_token,
    bool lost_resource,
    BlockingTaskRunner* main_thread_task_runner) {
  if (!updater.get()) {
    // Resource was already deleted.
    return;
  }

  const ResourceList::iterator resource_it = std::find_if(
      updater->all_resources_.begin(), updater->all_resources_.end(),
      [resource_id](const PlaneResource& plane_resource) {
        return plane_resource.resource_id() == resource_id;
      });
  if (resource_it == updater->all_resources_.end())
    return;

  ContextProvider* context_provider = updater->context_provider_;
  if (context_provider && sync_token.HasData()) {
    context_provider->ContextGL()->WaitSyncTokenCHROMIUM(
        sync_token.GetConstData());
  }

  if (lost_resource) {
    resource_it->clear_refs();
    updater->DeleteResource(resource_it);
    return;
  }

  resource_it->remove_ref();
}

}  // namespace cc