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
|
// 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_row_based.h"
#include "base/logging.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),
screen_size_(SkISize::Make(0,0)),
packet_size_(kPacketSize) {
}
EncoderRowBased::EncoderRowBased(Compressor* compressor,
VideoPacketFormat::Encoding encoding,
int packet_size)
: encoding_(encoding),
compressor_(compressor),
screen_size_(SkISize::Make(0,0)),
packet_size_(packet_size) {
}
EncoderRowBased::~EncoderRowBased() {}
void EncoderRowBased::Encode(
scoped_refptr<CaptureData> capture_data,
bool key_frame,
const 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_ = 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 EncoderRowBased::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();
compressor_->Reset();
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(), 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.get()) {
packet.reset(new VideoPacket());
out = GetOutputBuffer(packet.get(), 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);
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);
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.Pass());
}
// 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 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(encoding_);
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* 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
|
