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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
// 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_verbatim.h"
#include "base/logging.h"
#include "remoting/base/util.h"
namespace remoting {
namespace {
// Both input and output data are assumed to be RGBA32.
const int kBytesPerPixel = 4;
} // namespace
VideoDecoderVerbatim::VideoDecoderVerbatim()
: state_(kUninitialized),
clip_(SkIRect::MakeEmpty()),
row_pos_(0),
row_y_(0),
screen_size_(SkISize::Make(0, 0)) {
}
VideoDecoderVerbatim::~VideoDecoderVerbatim() {
}
bool VideoDecoderVerbatim::IsReadyForData() {
switch (state_) {
case kUninitialized:
case kError:
return false;
case kReady:
case kProcessing:
case kPartitionDone:
case kDone:
return true;
}
NOTREACHED();
return false;
}
void VideoDecoderVerbatim::Initialize(const SkISize& screen_size) {
updated_region_.setEmpty();
screen_buffer_.reset();
screen_size_ = screen_size;
// Allocate the screen buffer, if necessary.
if (!screen_size_.isEmpty()) {
screen_buffer_.reset(new uint8[
screen_size_.width() * screen_size_.height() * kBytesPerPixel]);
}
state_ = kReady;
}
VideoDecoder::DecodeResult VideoDecoderVerbatim::DecodePacket(
const VideoPacket* packet) {
UpdateStateForPacket(packet);
if (state_ == kError) {
return DECODE_ERROR;
}
const uint8* in = reinterpret_cast<const uint8*>(packet->data().data());
const int in_size = packet->data().size();
const int row_size = clip_.width() * kBytesPerPixel;
int out_stride = screen_size_.width() * kBytesPerPixel;
uint8* out = screen_buffer_.get() + out_stride * (clip_.top() + row_y_) +
kBytesPerPixel * clip_.left();
// Consume all the data in the message.
int used = 0;
while (used < in_size) {
if (row_y_ >= clip_.height()) {
state_ = kError;
LOG(WARNING) << "Too much data is received for the given rectangle.";
return DECODE_ERROR;
}
int bytes_to_copy = std::min(in_size - used, row_size - row_pos_);
memcpy(out + row_pos_, in + used, bytes_to_copy);
used += bytes_to_copy;
row_pos_ += bytes_to_copy;
// If this row is completely filled then move onto the next row.
if (row_pos_ == row_size) {
++row_y_;
row_pos_ = 0;
out += out_stride;
}
}
if (state_ == kPartitionDone || state_ == kDone) {
if (row_y_ < clip_.height()) {
state_ = kError;
LOG(WARNING) << "Received LAST_PACKET, but didn't get enough data.";
return DECODE_ERROR;
}
updated_region_.op(clip_, SkRegion::kUnion_Op);
}
if (state_ == kDone) {
return DECODE_DONE;
} else {
return DECODE_IN_PROGRESS;
}
}
void VideoDecoderVerbatim::UpdateStateForPacket(const VideoPacket* packet) {
if (state_ == kError) {
return;
}
if (packet->flags() & VideoPacket::FIRST_PACKET) {
if (state_ != kReady && state_ != kDone && state_ != kPartitionDone) {
state_ = kError;
LOG(WARNING) << "Received unexpected FIRST_PACKET.";
return;
}
// Reset the buffer location status variables on the first packet.
clip_.setXYWH(packet->format().x(), packet->format().y(),
packet->format().width(), packet->format().height());
if (!SkIRect::MakeSize(screen_size_).contains(clip_)) {
state_ = kError;
LOG(WARNING) << "Invalid clipping area received.";
return;
}
state_ = kProcessing;
row_pos_ = 0;
row_y_ = 0;
}
if (state_ != kProcessing) {
state_ = kError;
LOG(WARNING) << "Received unexpected packet.";
return;
}
if (packet->flags() & VideoPacket::LAST_PACKET) {
if (state_ != kProcessing) {
state_ = kError;
LOG(WARNING) << "Received unexpected LAST_PACKET.";
return;
}
state_ = kPartitionDone;
}
if (packet->flags() & VideoPacket::LAST_PARTITION) {
if (state_ != kPartitionDone) {
state_ = kError;
LOG(WARNING) << "Received unexpected LAST_PARTITION.";
return;
}
state_ = kDone;
}
return;
}
VideoPacketFormat::Encoding VideoDecoderVerbatim::Encoding() {
return VideoPacketFormat::ENCODING_VERBATIM;
}
void VideoDecoderVerbatim::Invalidate(const SkISize& view_size,
const SkRegion& region) {
updated_region_.op(region, SkRegion::kUnion_Op);
}
void VideoDecoderVerbatim::RenderFrame(const SkISize& view_size,
const SkIRect& clip_area,
uint8* image_buffer,
int image_stride,
SkRegion* output_region) {
output_region->setEmpty();
// TODO(alexeypa): scaling is not implemented.
SkIRect clip_rect = SkIRect::MakeSize(screen_size_);
if (!clip_rect.intersect(clip_area))
return;
int screen_stride = screen_size_.width() * kBytesPerPixel;
for (SkRegion::Iterator i(updated_region_); !i.done(); i.next()) {
SkIRect rect(i.rect());
if (!rect.intersect(clip_rect))
continue;
CopyRGB32Rect(screen_buffer_.get(), screen_stride,
clip_rect,
image_buffer, image_stride,
clip_area,
rect);
output_region->op(rect, SkRegion::kUnion_Op);
}
updated_region_.setEmpty();
}
const SkRegion* VideoDecoderVerbatim::GetImageShape() {
return NULL;
}
} // namespace remoting
|
