Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA.

content/common/gpu/media/vp8_decoder.cc

+// Copyright 2015 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 "content/common/gpu/media/vp8_decoder.h"
+#include "media/base/limits.h"
+
+namespace content {
+
+VP8Decoder::VP8Accelerator::VP8Accelerator() {
+}
+
+VP8Decoder::VP8Accelerator::~VP8Accelerator() {
+}
+
+VP8Decoder::VP8Decoder(VP8Accelerator* accelerator)
+    : state_(kNeedStreamMetadata),
+      curr_frame_start_(nullptr),
+      frame_size_(0),
+      accelerator_(accelerator) {
+  DCHECK(accelerator_);
+}
+
+VP8Decoder::~VP8Decoder() {
+}
+
+bool VP8Decoder::Flush() {
+  DVLOG(2) << "Decoder flush";
+  Reset();
+  return true;
+}
+
+void VP8Decoder::SetStream(const uint8_t* ptr, size_t size) {
+  DCHECK(ptr);
+  DCHECK(size);
+
+  curr_frame_start_ = ptr;
+  frame_size_ = size;
+  DVLOG(4) << "New input stream at: " << (void*)ptr << " size: " << size;
+}
+
+void VP8Decoder::Reset() {
+  curr_pic_ = nullptr;
+  curr_frame_hdr_ = nullptr;
+  curr_frame_start_ = nullptr;
+  frame_size_ = 0;
+
+  last_frame_ = nullptr;
+  golden_frame_ = nullptr;
+  alt_frame_ = nullptr;
+
+  if (state_ == kDecoding)
+    state_ = kAfterReset;
+}
+
+VP8Decoder::DecodeResult VP8Decoder::Decode() {
+  if (!curr_frame_start_ || frame_size_ == 0)
+    return kRanOutOfStreamData;
+
+  if (!curr_frame_hdr_) {
+    curr_frame_hdr_.reset(new media::Vp8FrameHeader());
+    if (!parser_.ParseFrame(curr_frame_start_, frame_size_,
+                            curr_frame_hdr_.get())) {
+      DVLOG(1) << "Error during decode";
+      state_ = kError;
+      return kDecodeError;
+    }
+  }
+
+  if (curr_frame_hdr_->IsKeyframe()) {
+    gfx::Size new_pic_size(curr_frame_hdr_->width, curr_frame_hdr_->height);
+    if (new_pic_size.IsEmpty())
+      return kDecodeError;
+
+    if (new_pic_size != pic_size_) {
+      DVLOG(2) << "New resolution: " << new_pic_size.ToString();
+      pic_size_ = new_pic_size;
+      return kAllocateNewSurfaces;
+    }
+
+    state_ = kDecoding;
+  } else {
+    if (state_ != kDecoding) {
+      // Need a resume point.
+      curr_frame_hdr_.reset();
+      return kRanOutOfStreamData;
+    }
+  }
+
+  curr_pic_ = accelerator_->CreateVP8Picture();
+  if (!curr_pic_)
+    return kRanOutOfSurfaces;
+
+  if (!DecodeAndOutputCurrentFrame())
+    return kDecodeError;
+
+  return kRanOutOfStreamData;
+}
+
+void VP8Decoder::RefreshReferenceFrames() {
+  if (curr_frame_hdr_->IsKeyframe()) {
+    last_frame_ = curr_pic_;
+    golden_frame_ = curr_pic_;
+    alt_frame_ = curr_pic_;
+    return;
+  }
+
+  // Save current golden since we overwrite it here,
+  // but may have to use it to update alt below.
+  scoped_refptr<VP8Picture> curr_golden = golden_frame_;
+
+  if (curr_frame_hdr_->refresh_golden_frame) {
+    golden_frame_ = curr_pic_;
+  } else {
+    switch (curr_frame_hdr_->copy_buffer_to_golden) {
+      case media::Vp8FrameHeader::COPY_LAST_TO_GOLDEN:
+        DCHECK(last_frame_);
+        golden_frame_ = last_frame_;
+        break;
+
+      case media::Vp8FrameHeader::COPY_ALT_TO_GOLDEN:
+        DCHECK(alt_frame_);
+        golden_frame_ = alt_frame_;
+        break;
+    }
+  }
+
+  if (curr_frame_hdr_->refresh_alternate_frame) {
+    alt_frame_ = curr_pic_;
+  } else {
+    switch (curr_frame_hdr_->copy_buffer_to_alternate) {
+      case media::Vp8FrameHeader::COPY_LAST_TO_ALT:
+        DCHECK(last_frame_);
+        alt_frame_ = last_frame_;
+        break;
+
+      case media::Vp8FrameHeader::COPY_GOLDEN_TO_ALT:
+        DCHECK(curr_golden);
+        alt_frame_ = curr_golden;
+        break;
+    }
+  }
+
+  if (curr_frame_hdr_->refresh_last)
+    last_frame_ = curr_pic_;
+}
+
+bool VP8Decoder::DecodeAndOutputCurrentFrame() {
+  DCHECK(!pic_size_.IsEmpty());
+  DCHECK(curr_pic_);
+  DCHECK(curr_frame_hdr_);
+
+  if (curr_frame_hdr_->IsKeyframe()) {
+    horizontal_scale_ = curr_frame_hdr_->horizontal_scale;
+    vertical_scale_ = curr_frame_hdr_->vertical_scale;
+  } else {
+    // Populate fields from decoder state instead.
+    curr_frame_hdr_->width = pic_size_.width();
+    curr_frame_hdr_->height = pic_size_.height();
+    curr_frame_hdr_->horizontal_scale = horizontal_scale_;
+    curr_frame_hdr_->vertical_scale = vertical_scale_;
+  }
+
+  if (!accelerator_->SubmitDecode(curr_pic_, curr_frame_hdr_.get(), last_frame_,
+                                  golden_frame_, alt_frame_))
+    return false;
+
+  if (!accelerator_->OutputPicture(curr_pic_))
+    return false;
+
+  RefreshReferenceFrames();
+
+  curr_pic_ = nullptr;
+  curr_frame_hdr_ = nullptr;
+  curr_frame_start_ = nullptr;
+  frame_size_ = 0;
+  return true;
+}
+
+size_t VP8Decoder::GetRequiredNumOfPictures() const {
+  const size_t kVP8NumFramesActive = 4;
+  const size_t kPicsInPipeline = media::limits::kMaxVideoFrames + 2;
+  return kVP8NumFramesActive + kPicsInPipeline;
+}
+
+}  // namespace content