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
|
/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/test/fake_encoder.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace webrtc {
namespace test {
FakeEncoder::FakeEncoder(Clock* clock)
: clock_(clock),
callback_(NULL),
target_bitrate_kbps_(0),
max_target_bitrate_kbps_(-1),
last_encode_time_ms_(0) {
// Generate some arbitrary not-all-zero data
for (size_t i = 0; i < sizeof(encoded_buffer_); ++i) {
encoded_buffer_[i] = static_cast<uint8_t>(i);
}
}
FakeEncoder::~FakeEncoder() {}
void FakeEncoder::SetMaxBitrate(int max_kbps) {
assert(max_kbps >= -1); // max_kbps == -1 disables it.
max_target_bitrate_kbps_ = max_kbps;
}
int32_t FakeEncoder::InitEncode(const VideoCodec* config,
int32_t number_of_cores,
uint32_t max_payload_size) {
config_ = *config;
target_bitrate_kbps_ = config_.startBitrate;
return 0;
}
int32_t FakeEncoder::Encode(
const I420VideoFrame& input_image,
const CodecSpecificInfo* codec_specific_info,
const std::vector<VideoFrameType>* frame_types) {
assert(config_.maxFramerate > 0);
int time_since_last_encode_ms = 1000 / config_.maxFramerate;
int64_t time_now_ms = clock_->TimeInMilliseconds();
if (last_encode_time_ms_ > 0) {
// For all frames but the first we can estimate the display time by looking
// at the display time of the previous frame.
time_since_last_encode_ms = time_now_ms - last_encode_time_ms_;
}
int bits_available = target_bitrate_kbps_ * time_since_last_encode_ms;
int min_bits =
config_.simulcastStream[0].minBitrate * time_since_last_encode_ms;
if (bits_available < min_bits)
bits_available = min_bits;
int max_bits = max_target_bitrate_kbps_ * time_since_last_encode_ms;
if (max_bits > 0 && max_bits < bits_available)
bits_available = max_bits;
last_encode_time_ms_ = time_now_ms;
assert(config_.numberOfSimulcastStreams > 0);
for (int i = 0; i < config_.numberOfSimulcastStreams; ++i) {
CodecSpecificInfo specifics;
memset(&specifics, 0, sizeof(specifics));
specifics.codecType = kVideoCodecGeneric;
specifics.codecSpecific.generic.simulcast_idx = i;
int min_stream_bits =
config_.simulcastStream[i].minBitrate * time_since_last_encode_ms;
int max_stream_bits =
config_.simulcastStream[i].maxBitrate * time_since_last_encode_ms;
int stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
bits_available;
int stream_bytes = (stream_bits + 7) / 8;
if (static_cast<size_t>(stream_bytes) > sizeof(encoded_buffer_))
stream_bytes = sizeof(encoded_buffer_);
EncodedImage encoded(
encoded_buffer_, stream_bytes, sizeof(encoded_buffer_));
encoded._timeStamp = input_image.timestamp();
encoded.capture_time_ms_ = input_image.render_time_ms();
encoded._frameType = (*frame_types)[i];
// Always encode something on the first frame.
if (min_stream_bits > bits_available && i > 0) {
encoded._length = 0;
encoded._frameType = kSkipFrame;
}
assert(callback_ != NULL);
if (callback_->Encoded(encoded, &specifics, NULL) != 0)
return -1;
bits_available -= encoded._length * 8;
}
return 0;
}
int32_t FakeEncoder::RegisterEncodeCompleteCallback(
EncodedImageCallback* callback) {
callback_ = callback;
return 0;
}
int32_t FakeEncoder::Release() { return 0; }
int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int rtt) {
return 0;
}
int32_t FakeEncoder::SetRates(uint32_t new_target_bitrate, uint32_t framerate) {
target_bitrate_kbps_ = new_target_bitrate;
return 0;
}
} // namespace test
} // namespace webrtc
|
