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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_encoder_verbatim.h"
#include "base/logging.h"
#include "remoting/base/capture_data.h"
#include "remoting/base/util.h"
#include "remoting/proto/video.pb.h"
namespace remoting {
static const int kPacketSize = 1024 * 1024;
VideoEncoderVerbatim::VideoEncoderVerbatim()
: screen_size_(SkISize::Make(0,0)),
max_packet_size_(kPacketSize) {
}
void VideoEncoderVerbatim::SetMaxPacketSize(int size) {
max_packet_size_ = size;
}
VideoEncoderVerbatim::~VideoEncoderVerbatim() {
}
void VideoEncoderVerbatim::Encode(
scoped_refptr<CaptureData> capture_data,
bool key_frame,
const DataAvailableCallback& data_available_callback) {
CHECK(capture_data->pixel_format() == media::VideoFrame::RGB32)
<< "RowBased VideoEncoder only works with RGB32. Got "
<< capture_data->pixel_format();
capture_data_ = capture_data;
callback_ = data_available_callback;
const SkRegion& region = capture_data->dirty_region();
SkRegion::Iterator iter(region);
while (!iter.done()) {
SkIRect rect = iter.rect();
iter.next();
EncodeRect(rect, iter.done());
}
capture_data_ = NULL;
callback_.Reset();
}
void VideoEncoderVerbatim::EncodeRect(const SkIRect& rect, bool last) {
CHECK(capture_data_->data_planes().data[0]);
CHECK_EQ(capture_data_->pixel_format(), media::VideoFrame::RGB32);
const int strides = capture_data_->data_planes().strides[0];
const int bytes_per_pixel = 4;
const int row_size = bytes_per_pixel * rect.width();
scoped_ptr<VideoPacket> packet(new VideoPacket());
PrepareUpdateStart(rect, packet.get());
const uint8* in = capture_data_->data_planes().data[0] +
rect.fTop * strides + rect.fLeft * bytes_per_pixel;
// TODO(hclam): Fill in the sequence number.
uint8* out = GetOutputBuffer(packet.get(), max_packet_size_);
int filled = 0;
int row_pos = 0; // Position in the current row in bytes.
int row_y = 0; // Current row.
while (row_y < rect.height()) {
// Prepare a message for sending out.
if (!packet.get()) {
packet.reset(new VideoPacket());
out = GetOutputBuffer(packet.get(), max_packet_size_);
filled = 0;
}
if (row_y < rect.height()) {
int bytes_to_copy =
std::min(row_size - row_pos, max_packet_size_ - filled);
memcpy(out + filled, in + row_pos, bytes_to_copy);
row_pos += bytes_to_copy;
filled += bytes_to_copy;
// Jump to the next row when we've reached the end of the current row.
if (row_pos == row_size) {
row_pos = 0;
in += strides;
++row_y;
}
}
if (row_y == rect.height()) {
DCHECK_EQ(row_pos, 0);
packet->mutable_data()->resize(filled);
packet->set_flags(packet->flags() | VideoPacket::LAST_PACKET);
packet->set_capture_time_ms(capture_data_->capture_time_ms());
packet->set_client_sequence_number(
capture_data_->client_sequence_number());
SkIPoint dpi(capture_data_->dpi());
if (dpi.x())
packet->mutable_format()->set_x_dpi(dpi.x());
if (dpi.y())
packet->mutable_format()->set_y_dpi(dpi.y());
if (last)
packet->set_flags(packet->flags() | VideoPacket::LAST_PARTITION);
}
// If we have filled the current packet, then send it.
if (filled == max_packet_size_ || row_y == rect.height()) {
packet->mutable_data()->resize(filled);
callback_.Run(packet.Pass());
}
}
}
void VideoEncoderVerbatim::PrepareUpdateStart(const SkIRect& rect,
VideoPacket* packet) {
packet->set_flags(packet->flags() | VideoPacket::FIRST_PACKET);
VideoPacketFormat* format = packet->mutable_format();
format->set_x(rect.fLeft);
format->set_y(rect.fTop);
format->set_width(rect.width());
format->set_height(rect.height());
format->set_encoding(VideoPacketFormat::ENCODING_VERBATIM);
if (capture_data_->size() != screen_size_) {
screen_size_ = capture_data_->size();
format->set_screen_width(screen_size_.width());
format->set_screen_height(screen_size_.height());
}
}
uint8* VideoEncoderVerbatim::GetOutputBuffer(VideoPacket* packet, size_t size) {
packet->mutable_data()->resize(size);
// TODO(ajwong): Is there a better way to do this at all???
return const_cast<uint8*>(reinterpret_cast<const uint8*>(
packet->mutable_data()->data()));
}
} // namespace remoting
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