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// Copyright (c) 2010 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/base/encoder_row_based.h"
#include "base/logging.h"
#include "gfx/rect.h"
#include "remoting/base/capture_data.h"
#include "remoting/base/compressor_verbatim.h"
#include "remoting/base/compressor_zlib.h"
#include "remoting/base/util.h"
#include "remoting/proto/video.pb.h"
namespace remoting {
static const int kPacketSize = 1024 * 1024;
EncoderRowBased* EncoderRowBased::CreateZlibEncoder() {
return new EncoderRowBased(new CompressorZlib(),
VideoPacketFormat::ENCODING_ZLIB);
}
EncoderRowBased* EncoderRowBased::CreateZlibEncoder(int packet_size) {
return new EncoderRowBased(new CompressorZlib(),
VideoPacketFormat::ENCODING_ZLIB,
packet_size);
}
EncoderRowBased* EncoderRowBased::CreateVerbatimEncoder() {
return new EncoderRowBased(new CompressorVerbatim(),
VideoPacketFormat::ENCODING_VERBATIM);
}
EncoderRowBased* EncoderRowBased::CreateVerbatimEncoder(int packet_size) {
return new EncoderRowBased(new CompressorVerbatim(),
VideoPacketFormat::ENCODING_VERBATIM,
packet_size);
}
EncoderRowBased::EncoderRowBased(Compressor* compressor,
VideoPacketFormat::Encoding encoding)
: encoding_(encoding),
compressor_(compressor),
packet_size_(kPacketSize) {
}
EncoderRowBased::EncoderRowBased(Compressor* compressor,
VideoPacketFormat::Encoding encoding,
int packet_size)
: encoding_(encoding),
compressor_(compressor),
packet_size_(packet_size) {
}
EncoderRowBased::~EncoderRowBased() {}
void EncoderRowBased::Encode(scoped_refptr<CaptureData> capture_data,
bool key_frame,
DataAvailableCallback* data_available_callback) {
CHECK(capture_data->pixel_format() == media::VideoFrame::RGB32)
<< "RowBased Encoder only works with RGB32. Got "
<< capture_data->pixel_format();
capture_data_ = capture_data;
callback_.reset(data_available_callback);
const InvalidRects& rects = capture_data->dirty_rects();
for (InvalidRects::const_iterator r = rects.begin(); r != rects.end(); ++r) {
EncodeRect(*r, r == --rects.end());
}
capture_data_ = NULL;
callback_.reset();
}
void EncoderRowBased::EncodeRect(const gfx::Rect& rect, bool last) {
CHECK(capture_data_->data_planes().data[0]);
const int strides = capture_data_->data_planes().strides[0];
const int bytes_per_pixel = GetBytesPerPixel(capture_data_->pixel_format());
const int row_size = bytes_per_pixel * rect.width();
compressor_->Reset();
VideoPacket* packet = new VideoPacket();
PrepareUpdateStart(rect, packet);
const uint8* in = capture_data_->data_planes().data[0] +
rect.y() * strides + rect.x() * bytes_per_pixel;
// TODO(hclam): Fill in the sequence number.
uint8* out = GetOutputBuffer(packet, packet_size_);
int filled = 0;
int row_pos = 0; // Position in the current row in bytes.
int row_y = 0; // Current row.
bool compress_again = true;
while (compress_again) {
// Prepare a message for sending out.
if (!packet) {
packet = new VideoPacket();
out = GetOutputBuffer(packet, packet_size_);
filled = 0;
}
Compressor::CompressorFlush flush = Compressor::CompressorNoFlush;
if (row_y == rect.height() - 1) {
flush = Compressor::CompressorFinish;
}
int consumed = 0;
int written = 0;
compress_again = compressor_->Process(in + row_pos, row_size - row_pos,
out + filled, packet_size_ - filled,
flush, &consumed, &written);
row_pos += consumed;
filled += written;
// We have reached the end of stream.
if (!compress_again) {
packet->set_flags(packet->flags() | VideoPacket::LAST_PACKET);
if (last)
packet->set_flags(packet->flags() | VideoPacket::LAST_PARTITION);
DCHECK(row_pos == row_size);
DCHECK(row_y == rect.height() - 1);
}
// If we have filled the message or we have reached the end of stream.
if (filled == packet_size_ || !compress_again) {
packet->mutable_data()->resize(filled);
callback_->Run(packet);
packet = NULL;
}
// Reached the end of input row and we're not at the last row.
if (row_pos == row_size && row_y < rect.height() - 1) {
row_pos = 0;
in += strides;
++row_y;
}
}
}
void EncoderRowBased::PrepareUpdateStart(const gfx::Rect& rect,
VideoPacket* packet) {
packet->set_flags(packet->flags() | VideoPacket::FIRST_PACKET);
VideoPacketFormat* format = packet->mutable_format();
format->set_x(rect.x());
format->set_y(rect.y());
format->set_width(rect.width());
format->set_height(rect.height());
format->set_encoding(encoding_);
}
uint8* EncoderRowBased::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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