1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
// 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_zlib.h"
#include "gfx/rect.h"
#include "media/base/data_buffer.h"
#include "remoting/base/capture_data.h"
#include "remoting/base/compressor_zlib.h"
#include "remoting/base/protocol_util.h"
#include "remoting/base/protocol/chromotocol.pb.h"
namespace remoting {
static const int kPacketSize = 1024 * 1024;
EncoderZlib::EncoderZlib() : packet_size_(kPacketSize) {
}
EncoderZlib::EncoderZlib(int packet_size) : packet_size_(packet_size) {
}
void EncoderZlib::Encode(scoped_refptr<CaptureData> capture_data,
bool key_frame,
DataAvailableCallback* data_available_callback) {
CHECK(capture_data->pixel_format() == PixelFormatRgb32)
<< "Zlib Encoder only works with RGB32";
capture_data_ = capture_data;
callback_.reset(data_available_callback);
CompressorZlib compressor;
const InvalidRects& rects = capture_data->dirty_rects();
int index = 0;
for (InvalidRects::const_iterator r = rects.begin();
r != rects.end(); ++r, ++index) {
EncodeRect(&compressor, *r, index);
}
capture_data_ = NULL;
callback_.reset();
}
void EncoderZlib::EncodeRect(CompressorZlib* compressor,
const gfx::Rect& rect, size_t rect_index) {
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();
HostMessage* message = PrepareMessage(&rect);
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 = (uint8*)message->mutable_update_stream_packet()->
mutable_rect_data()->mutable_data()->data();
int filled = 0;
int row_x = 0;
int row_y = 0;
bool compress_again = true;
while (compress_again) {
// Prepare a message for sending out.
if (!message) {
message = PrepareMessage(NULL);
out = (uint8*)(message->mutable_update_stream_packet()->
mutable_rect_data()->mutable_data()->data());
filled = 0;
}
Compressor::CompressorFlush flush = Compressor::CompressorNoFlush;
if (row_y == rect.height() - 1) {
if (rect_index == capture_data_->dirty_rects().size() - 1) {
flush = Compressor::CompressorFinish;
} else {
flush = Compressor::CompressorSyncFlush;
}
}
int consumed = 0;
int written = 0;
compress_again = compressor->Process(in + row_x, row_size - row_x,
out + filled, packet_size_ - filled,
flush, &consumed, &written);
row_x += consumed;
filled += written;
// We have reached the end of stream.
if (!compress_again) {
message->mutable_update_stream_packet()->mutable_end_rect();
}
// If we have filled the message or we have reached the end of stream.
if (filled == packet_size_ || !compress_again) {
message->mutable_update_stream_packet()->mutable_rect_data()->
mutable_data()->resize(filled);
SubmitMessage(message, rect_index);
message = NULL;
}
// Reached the end of input row and we're not at the last row.
if (row_x == row_size && row_y < rect.height() - 1) {
row_x = 0;
in += strides;
++row_y;
}
}
}
HostMessage* EncoderZlib::PrepareMessage(const gfx::Rect* rect) {
HostMessage* message = new HostMessage();
UpdateStreamPacketMessage* packet = message->mutable_update_stream_packet();
// Prepare the begin rect content.
if (rect != NULL) {
packet->mutable_begin_rect()->set_x(rect->x());
packet->mutable_begin_rect()->set_y(rect->y());
packet->mutable_begin_rect()->set_width(rect->width());
packet->mutable_begin_rect()->set_height(rect->height());
packet->mutable_begin_rect()->set_encoding(EncodingZlib);
packet->mutable_begin_rect()->set_pixel_format(
capture_data_->pixel_format());
}
packet->mutable_rect_data()->mutable_data()->resize(packet_size_);
return message;
}
void EncoderZlib::SubmitMessage(HostMessage* message, size_t rect_index) {
EncodingState state = EncodingInProgress;
if (rect_index == 0 && message->update_stream_packet().has_begin_rect())
state |= EncodingStarting;
if (rect_index == capture_data_->dirty_rects().size() - 1 &&
message->update_stream_packet().has_end_rect())
state |= EncodingEnded;
callback_->Run(message, state);
}
} // namespace remoting
|
