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// 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 "remoting/codec/video_decoder_vp8.h"
#include <math.h>
#include "base/logging.h"
#include "media/base/media.h"
#include "media/base/yuv_convert.h"
#include "remoting/base/util.h"
extern "C" {
#define VPX_CODEC_DISABLE_COMPAT 1
#include "third_party/libvpx/libvpx.h"
}
namespace remoting {
VideoDecoderVp8::VideoDecoderVp8()
: state_(kUninitialized),
codec_(NULL),
last_image_(NULL),
screen_size_(SkISize::Make(0, 0)) {
}
VideoDecoderVp8::~VideoDecoderVp8() {
if (codec_) {
vpx_codec_err_t ret = vpx_codec_destroy(codec_);
CHECK(ret == VPX_CODEC_OK) << "Failed to destroy codec";
}
delete codec_;
}
void VideoDecoderVp8::Initialize(const SkISize& screen_size) {
DCHECK(!screen_size.isEmpty());
screen_size_ = screen_size;
state_ = kReady;
}
VideoDecoder::DecodeResult VideoDecoderVp8::DecodePacket(
const VideoPacket* packet) {
DCHECK_EQ(kReady, state_);
// Initialize the codec as needed.
if (!codec_) {
codec_ = new vpx_codec_ctx_t();
// TODO(hclam): Scale the number of threads with number of cores of the
// machine.
vpx_codec_dec_cfg config;
config.w = 0;
config.h = 0;
config.threads = 2;
vpx_codec_err_t ret =
vpx_codec_dec_init(
codec_, vpx_codec_vp8_dx(), &config, 0);
if (ret != VPX_CODEC_OK) {
LOG(INFO) << "Cannot initialize codec.";
delete codec_;
codec_ = NULL;
state_ = kError;
return DECODE_ERROR;
}
}
// Do the actual decoding.
vpx_codec_err_t ret = vpx_codec_decode(
codec_, reinterpret_cast<const uint8*>(packet->data().data()),
packet->data().size(), NULL, 0);
if (ret != VPX_CODEC_OK) {
LOG(INFO) << "Decoding failed:" << vpx_codec_err_to_string(ret) << "\n"
<< "Details: " << vpx_codec_error(codec_) << "\n"
<< vpx_codec_error_detail(codec_);
return DECODE_ERROR;
}
// Gets the decoded data.
vpx_codec_iter_t iter = NULL;
vpx_image_t* image = vpx_codec_get_frame(codec_, &iter);
if (!image) {
LOG(INFO) << "No video frame decoded";
return DECODE_ERROR;
}
last_image_ = image;
SkRegion region;
for (int i = 0; i < packet->dirty_rects_size(); ++i) {
Rect remoting_rect = packet->dirty_rects(i);
SkIRect rect = SkIRect::MakeXYWH(remoting_rect.x(),
remoting_rect.y(),
remoting_rect.width(),
remoting_rect.height());
region.op(rect, SkRegion::kUnion_Op);
}
updated_region_.op(region, SkRegion::kUnion_Op);
return DECODE_DONE;
}
bool VideoDecoderVp8::IsReadyForData() {
return state_ == kReady;
}
VideoPacketFormat::Encoding VideoDecoderVp8::Encoding() {
return VideoPacketFormat::ENCODING_VP8;
}
void VideoDecoderVp8::Invalidate(const SkISize& view_size,
const SkRegion& region) {
DCHECK_EQ(kReady, state_);
DCHECK(!view_size.isEmpty());
for (SkRegion::Iterator i(region); !i.done(); i.next()) {
SkIRect rect = i.rect();
rect = ScaleRect(rect, view_size, screen_size_);
updated_region_.op(rect, SkRegion::kUnion_Op);
}
}
void VideoDecoderVp8::RenderFrame(const SkISize& view_size,
const SkIRect& clip_area,
uint8* image_buffer,
int image_stride,
SkRegion* output_region) {
DCHECK_EQ(kReady, state_);
DCHECK(!view_size.isEmpty());
// Early-return and do nothing if we haven't yet decoded any frames.
if (!last_image_)
return;
SkIRect source_clip = SkIRect::MakeWH(last_image_->d_w, last_image_->d_h);
// ScaleYUVToRGB32WithRect does not currently support up-scaling. We won't
// be asked to up-scale except during resizes or if page zoom is >100%, so
// we work-around the limitation by using the slower ScaleYUVToRGB32.
// TODO(wez): Remove this hack if/when ScaleYUVToRGB32WithRect can up-scale.
if (!updated_region_.isEmpty() &&
(source_clip.width() < view_size.width() ||
source_clip.height() < view_size.height())) {
// We're scaling only |clip_area| into the |image_buffer|, so we need to
// work out which source rectangle that corresponds to.
SkIRect source_rect = ScaleRect(clip_area, view_size, screen_size_);
source_rect = SkIRect::MakeLTRB(RoundToTwosMultiple(source_rect.left()),
RoundToTwosMultiple(source_rect.top()),
source_rect.right(),
source_rect.bottom());
// If there were no changes within the clip source area then don't render.
if (!updated_region_.intersects(source_rect))
return;
// Scale & convert the entire clip area.
int y_offset = CalculateYOffset(source_rect.x(),
source_rect.y(),
last_image_->stride[0]);
int uv_offset = CalculateUVOffset(source_rect.x(),
source_rect.y(),
last_image_->stride[1]);
ScaleYUVToRGB32(last_image_->planes[0] + y_offset,
last_image_->planes[1] + uv_offset,
last_image_->planes[2] + uv_offset,
image_buffer,
source_rect.width(),
source_rect.height(),
clip_area.width(),
clip_area.height(),
last_image_->stride[0],
last_image_->stride[1],
image_stride,
media::YV12,
media::ROTATE_0,
media::FILTER_BILINEAR);
output_region->op(clip_area, SkRegion::kUnion_Op);
updated_region_.op(source_rect, SkRegion::kDifference_Op);
return;
}
for (SkRegion::Iterator i(updated_region_); !i.done(); i.next()) {
// Determine the scaled area affected by this rectangle changing.
SkIRect rect = i.rect();
if (!rect.intersect(source_clip))
continue;
rect = ScaleRect(rect, screen_size_, view_size);
if (!rect.intersect(clip_area))
continue;
ConvertAndScaleYUVToRGB32Rect(last_image_->planes[0],
last_image_->planes[1],
last_image_->planes[2],
last_image_->stride[0],
last_image_->stride[1],
screen_size_,
source_clip,
image_buffer,
image_stride,
view_size,
clip_area,
rect);
output_region->op(rect, SkRegion::kUnion_Op);
}
updated_region_.op(ScaleRect(clip_area, view_size, screen_size_),
SkRegion::kDifference_Op);
}
} // namespace remoting
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