media: Optimize HW Video to 2D Canvas copy.

cc/resources/media/skcanvas_video_renderer.cc

+// Copyright (c) 2012 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/media/skcanvas_video_renderer.h"
+
+#include "base/logging.h"
+#include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/mailbox_holder.h"
+#include "media/base/video_frame.h"
+#include "media/base/yuv_convert.h"
+#include "skia/ext/refptr.h"
+#include "third_party/libyuv/include/libyuv.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+#include "third_party/skia/include/gpu/SkGrPixelRef.h"
+
+// Skia internal format depends on a platform. On Android it is ABGR, on others
+// it is ARGB.
+#if SK_B32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_R32_SHIFT == 16 && \
+    SK_A32_SHIFT == 24
+#define LIBYUV_I420_TO_ARGB libyuv::I420ToARGB
+#define LIBYUV_I422_TO_ARGB libyuv::I422ToARGB
+#elif SK_R32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_B32_SHIFT == 16 && \
+    SK_A32_SHIFT == 24
+#define LIBYUV_I420_TO_ARGB libyuv::I420ToABGR
+#define LIBYUV_I422_TO_ARGB libyuv::I422ToABGR

[dshwang, 2014/08/06 14:10:59]

Now cc depends on thirdparty/libyuv directly.
However, we can avoid it, if we make wrapper of those functions in
yuv_convert.h.

For example,
Define media::ConvertI422ToABGR() in media/base/yuv_convert.h and then here just
calls media::ConvertI422ToABGR(). media::ConvertI422ToABGR() would be
void ConvertI422ToABGR(...) {
  libyuv::I420ToABGR(...);
}

WDYT? danakj@, scherkus@, acolwell@

+#else
+#error Unexpected Skia ARGB_8888 layout!
+#endif
+
+namespace cc {
+
+namespace {
+
+bool IsYUV(media::VideoFrame::Format format) {
+  return format == media::VideoFrame::YV12 ||
+         format == media::VideoFrame::YV16 ||
+         format == media::VideoFrame::I420 ||
+         format == media::VideoFrame::YV12A ||
+         format == media::VideoFrame::YV12J ||
+         format == media::VideoFrame::YV24;
+}
+
+bool IsYUVOrNative(media::VideoFrame::Format format) {
+  return IsYUV(format) || format == media::VideoFrame::NATIVE_TEXTURE;
+}
+
+// Converts a VideoFrame containing YUV data to a SkBitmap containing RGB data.
+//
+// |bitmap| will be (re)allocated to match the dimensions of |video_frame|.
+void ConvertVideoFrameToBitmap(media::VideoFrame* video_frame,
+                               SkBitmap* bitmap) {
+  DCHECK(IsYUVOrNative(video_frame->format())) << video_frame->format();
+  if (IsYUV(video_frame->format())) {
+    DCHECK_EQ(video_frame->stride(media::VideoFrame::kUPlane),
+              video_frame->stride(media::VideoFrame::kVPlane));
+  }
+
+  // Check if |bitmap| needs to be (re)allocated.
+  if (bitmap->isNull() ||
+      bitmap->width() != video_frame->visible_rect().width() ||
+      bitmap->height() != video_frame->visible_rect().height()) {
+    bitmap->allocN32Pixels(video_frame->visible_rect().width(),
+                           video_frame->visible_rect().height());
+    bitmap->setIsVolatile(true);
+  }
+
+  bitmap->lockPixels();
+
+  size_t y_offset = 0;
+  size_t uv_offset = 0;
+  if (IsYUV(video_frame->format())) {
+    int y_shift = (video_frame->format() == media::VideoFrame::YV16) ? 0 : 1;
+    // Use the "left" and "top" of the destination rect to locate the offset
+    // in Y, U and V planes.
+    y_offset = (video_frame->stride(media::VideoFrame::kYPlane) *
+                video_frame->visible_rect().y()) +
+               video_frame->visible_rect().x();
+    // For format YV12, there is one U, V value per 2x2 block.
+    // For format YV16, there is one U, V value per 2x1 block.
+    uv_offset = (video_frame->stride(media::VideoFrame::kUPlane) *
+                 (video_frame->visible_rect().y() >> y_shift)) +
+                (video_frame->visible_rect().x() >> 1);
+  }
+
+  switch (video_frame->format()) {
+    case media::VideoFrame::YV12:
+    case media::VideoFrame::I420:
+      LIBYUV_I420_TO_ARGB(
+          video_frame->data(media::VideoFrame::kYPlane) + y_offset,
+          video_frame->stride(media::VideoFrame::kYPlane),
+          video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kUPlane),
+          video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kVPlane),
+          static_cast<uint8*>(bitmap->getPixels()),
+          bitmap->rowBytes(),
+          video_frame->visible_rect().width(),
+          video_frame->visible_rect().height());
+      break;
+
+    case media::VideoFrame::YV12J:
+      media::ConvertYUVToRGB32(
+          video_frame->data(media::VideoFrame::kYPlane) + y_offset,
+          video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
+          video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
+          static_cast<uint8*>(bitmap->getPixels()),
+          video_frame->visible_rect().width(),
+          video_frame->visible_rect().height(),
+          video_frame->stride(media::VideoFrame::kYPlane),
+          video_frame->stride(media::VideoFrame::kUPlane),
+          bitmap->rowBytes(),
+          media::YV12J);
+      break;
+
+    case media::VideoFrame::YV16:
+      LIBYUV_I422_TO_ARGB(
+          video_frame->data(media::VideoFrame::kYPlane) + y_offset,
+          video_frame->stride(media::VideoFrame::kYPlane),
+          video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kUPlane),
+          video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kVPlane),
+          static_cast<uint8*>(bitmap->getPixels()),
+          bitmap->rowBytes(),
+          video_frame->visible_rect().width(),
+          video_frame->visible_rect().height());
+      break;
+
+    case media::VideoFrame::YV12A:
+      // Since libyuv doesn't support YUVA, fallback to media, which is not ARM
+      // optimized.
+      // TODO(fbarchard, mtomasz): Use libyuv, then copy the alpha channel.
+      media::ConvertYUVAToARGB(
+          video_frame->data(media::VideoFrame::kYPlane) + y_offset,
+          video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
+          video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
+          video_frame->data(media::VideoFrame::kAPlane),
+          static_cast<uint8*>(bitmap->getPixels()),
+          video_frame->visible_rect().width(),
+          video_frame->visible_rect().height(),
+          video_frame->stride(media::VideoFrame::kYPlane),
+          video_frame->stride(media::VideoFrame::kUPlane),
+          video_frame->stride(media::VideoFrame::kAPlane),
+          bitmap->rowBytes(),
+          media::YV12);
+      break;
+
+    case media::VideoFrame::YV24:
+      libyuv::I444ToARGB(
+          video_frame->data(media::VideoFrame::kYPlane) + y_offset,
+          video_frame->stride(media::VideoFrame::kYPlane),
+          video_frame->data(media::VideoFrame::kUPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kUPlane),
+          video_frame->data(media::VideoFrame::kVPlane) + uv_offset,
+          video_frame->stride(media::VideoFrame::kVPlane),
+          static_cast<uint8*>(bitmap->getPixels()),
+          bitmap->rowBytes(),
+          video_frame->visible_rect().width(),
+          video_frame->visible_rect().height());
+#if SK_R32_SHIFT == 0 && SK_G32_SHIFT == 8 && SK_B32_SHIFT == 16 && \
+    SK_A32_SHIFT == 24
+      libyuv::ARGBToABGR(static_cast<uint8*>(bitmap->getPixels()),
+                         bitmap->rowBytes(),
+                         static_cast<uint8*>(bitmap->getPixels()),
+                         bitmap->rowBytes(),
+                         video_frame->visible_rect().width(),
+                         video_frame->visible_rect().height());
+#endif
+      break;
+
+    case media::VideoFrame::NATIVE_TEXTURE:
+      DCHECK_EQ(video_frame->format(), media::VideoFrame::NATIVE_TEXTURE);
+      video_frame->ReadPixelsFromNativeTexture(*bitmap);
+      break;
+
+    default:
+      NOTREACHED();
+      break;
+  }
+  bitmap->notifyPixelsChanged();
+  bitmap->unlockPixels();
+}
+
+bool EnsureTextureBackedSkBitmap(GrContext* gr,
+                                 SkBitmap* bitmap,
+                                 const gfx::Size& size,
+                                 GrSurfaceOrigin origin,
+                                 GrPixelConfig config) {
+  if (!bitmap->getTexture() || bitmap->width() != size.width() ||
+      bitmap->height() != size.height()) {
+    if (!gr)
+      return false;
+    GrTextureDesc desc;
+    desc.fConfig = config;
+    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
+    desc.fSampleCnt = 0;
+    desc.fOrigin = origin;
+    desc.fWidth = size.width();
+    desc.fHeight = size.height();
+    skia::RefPtr<GrTexture> texture;
+    texture = skia::AdoptRef(gr->createUncachedTexture(desc, 0, 0));
+    if (!texture.get())
+      return false;
+
+    SkImageInfo info = SkImageInfo::MakeN32Premul(desc.fWidth, desc.fHeight);
+    SkGrPixelRef* pixelRef = SkNEW_ARGS(SkGrPixelRef, (info, texture.get()));
+    if (!pixelRef)
+      return false;
+    bitmap->setInfo(info);
+    bitmap->setPixelRef(pixelRef)->unref();
+  }
+
+  return true;
+}
+
+bool ConvertVideoFrameToTexture(media::VideoFrame* video_frame,
+                                SkBitmap* bitmap,
+                                ContextProvider* context_provider) {
+  DCHECK(context_provider &&
+         video_frame->format() == media::VideoFrame::NATIVE_TEXTURE);
+  gpu::gles2::GLES2Interface* gl = context_provider->ContextGL();
+  DCHECK(gl);
+
+  // Check if we could reuse existing texture based bitmap.
+  // Otherwise, release existing texture based bitmap and allocate
+  // a new one based on video size.
+  if (!EnsureTextureBackedSkBitmap(context_provider->GrContext(),
+                                   bitmap,
+                                   video_frame->visible_rect().size(),
+                                   kTopLeft_GrSurfaceOrigin,
+                                   kSkia8888_GrPixelConfig)) {
+    return false;
+  }
+
+  unsigned textureId =
+      static_cast<unsigned>((bitmap->getTexture())->getTextureHandle());
+  SkCanvasVideoRenderer::CopyVideoFrameToTexture(
+      gl, video_frame, textureId, 0, GL_RGBA, GL_UNSIGNED_BYTE, true, false);
+  return true;
+}
+
+class SyncPointClientImpl : public media::VideoFrame::SyncPointClient {
+ public:
+  explicit SyncPointClientImpl(gpu::gles2::GLES2Interface* gl) : gl_(gl) {}
+  virtual ~SyncPointClientImpl() {}
+  virtual uint32 InsertSyncPoint() OVERRIDE {
+    return gl_->InsertSyncPointCHROMIUM();
+  }
+  virtual void WaitSyncPoint(uint32 sync_point) OVERRIDE {
+    gl_->WaitSyncPointCHROMIUM(sync_point);
+  }
+
+ private:
+  gpu::gles2::GLES2Interface* gl_;
+};
+
+}  // anonymous namespace
+
+SkCanvasVideoRenderer::SkCanvasVideoRenderer()
+    : last_frame_timestamp_(media::kNoTimestamp()),
+      accelerated_last_frame_timestamp_(media::kNoTimestamp()) {
+}
+
+SkCanvasVideoRenderer::~SkCanvasVideoRenderer() {
+}
+
+void SkCanvasVideoRenderer::Paint(media::VideoFrame* video_frame,
+                                  SkCanvas* canvas,
+                                  const gfx::RectF& dest_rect,
+                                  uint8 alpha,
+                                  ContextProvider* context_provider) {
+  if (alpha == 0) {
+    return;
+  }
+
+  SkRect dest;
+  dest.set(dest_rect.x(), dest_rect.y(), dest_rect.right(), dest_rect.bottom());
+
+  SkPaint paint;
+  paint.setAlpha(alpha);
+
+  // Paint black rectangle if there isn't a frame available or the
+  // frame has an unexpected format.
+  if (!video_frame || video_frame->natural_size().IsEmpty() ||
+      !IsYUVOrNative(video_frame->format())) {
+    canvas->drawRect(dest, paint);
+    return;
+  }
+
+  bool accelerated = false;
+  if (context_provider &&
+      video_frame->format() == media::VideoFrame::NATIVE_TEXTURE &&
+      canvas->getGrContext()) {
+    // TODO(dshwang): Android video decoder doesn't update the timestamp on a
+    // VideoFrame. To reduce redundant copy, Android should update the
+    // timestamp.
+    if (video_frame->timestamp() != accelerated_last_frame_timestamp_ ||
+        video_frame->timestamp() == base::TimeDelta()) {
+      accelerated = ConvertVideoFrameToTexture(
+          video_frame, &accelerated_last_frame_, context_provider);
+      if (accelerated) {
+        accelerated_last_frame_timestamp_ = video_frame->timestamp();
+      }
+    } else {
+      DCHECK(accelerated_last_frame_.getTexture());
+      accelerated = true;
+    }
+  }
+
+  // Check if we should convert and update |last_frame_|.
+  if (!accelerated && video_frame->timestamp() != last_frame_timestamp_) {
+    ConvertVideoFrameToBitmap(video_frame, &last_frame_);
+    last_frame_timestamp_ = video_frame->timestamp();
+  }
+
+  canvas->drawBitmapRect(
+      accelerated ? accelerated_last_frame_ : last_frame_, NULL, dest, &paint);
+
+  CleanUpTemporaryBuffers();
+}
+
+// If a buffer is not used by 3 sec, remove it.
+void SkCanvasVideoRenderer::CleanUpTemporaryBuffers() {
+  static const base::TimeDelta buffer_time = base::TimeDelta::FromSeconds(3);
+  base::TimeDelta last_timestamp =
+      accelerated_last_frame_timestamp_ > last_frame_timestamp_
+          ? accelerated_last_frame_timestamp_
+          : last_frame_timestamp_;
+  if (last_timestamp > last_frame_timestamp_ + buffer_time &&
+      !last_frame_.isNull())
+    last_frame_.reset();
+  if (last_timestamp > accelerated_last_frame_timestamp_ + buffer_time &&
+      !accelerated_last_frame_.isNull())
+    accelerated_last_frame_.reset();
+}
+
+// static
+void SkCanvasVideoRenderer::CopyVideoFrameToTexture(
+    gpu::gles2::GLES2Interface* gl,
+    media::VideoFrame* video_frame,
+    unsigned int texture,
+    unsigned int level,
+    unsigned int internal_format,
+    unsigned int type,
+    bool premultiply_alpha,
+    bool flip_y) {
+  DCHECK(video_frame &&
+         video_frame->format() == media::VideoFrame::NATIVE_TEXTURE);
+  const gpu::MailboxHolder* mailbox_holder = video_frame->mailbox_holder();
+  DCHECK(mailbox_holder->texture_target == GL_TEXTURE_2D ||
+         mailbox_holder->texture_target == GL_TEXTURE_EXTERNAL_OES);
+
+  gl->WaitSyncPointCHROMIUM(mailbox_holder->sync_point);
+  uint32 source_texture = gl->CreateAndConsumeTextureCHROMIUM(
+      mailbox_holder->texture_target, mailbox_holder->mailbox.name);
+
+  // The video is stored in a unmultiplied format, so premultiply
+  // if necessary.
+  gl->PixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM, premultiply_alpha);
+  // Application itself needs to take care of setting the right flip_y
+  // value down to get the expected result.
+  // flip_y==true means to reverse the video orientation while
+  // flip_y==false means to keep the intrinsic orientation.
+  gl->PixelStorei(GL_UNPACK_FLIP_Y_CHROMIUM, flip_y);
+  gl->CopyTextureCHROMIUM(
+      GL_TEXTURE_2D, source_texture, texture, level, internal_format, type);
+  gl->PixelStorei(GL_UNPACK_FLIP_Y_CHROMIUM, false);
+  gl->PixelStorei(GL_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM, false);
+
+  gl->DeleteTextures(1, &source_texture);
+  gl->Flush();
+
+  SyncPointClientImpl client(gl);
+  video_frame->UpdateReleaseSyncPoint(&client);
+}
+
+}  // namespace cc