1 /*
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "webrtc/test/fake_encoder.h"
12
13 #include "testing/gtest/include/gtest/gtest.h"
14
15 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
16 #include "webrtc/system_wrappers/include/sleep.h"
17
18 namespace webrtc {
19 namespace test {
20
FakeEncoder(Clock * clock)21 FakeEncoder::FakeEncoder(Clock* clock)
22 : clock_(clock),
23 callback_(NULL),
24 target_bitrate_kbps_(0),
25 max_target_bitrate_kbps_(-1),
26 last_encode_time_ms_(0) {
27 // Generate some arbitrary not-all-zero data
28 for (size_t i = 0; i < sizeof(encoded_buffer_); ++i) {
29 encoded_buffer_[i] = static_cast<uint8_t>(i);
30 }
31 }
32
~FakeEncoder()33 FakeEncoder::~FakeEncoder() {}
34
SetMaxBitrate(int max_kbps)35 void FakeEncoder::SetMaxBitrate(int max_kbps) {
36 assert(max_kbps >= -1); // max_kbps == -1 disables it.
37 max_target_bitrate_kbps_ = max_kbps;
38 }
39
InitEncode(const VideoCodec * config,int32_t number_of_cores,size_t max_payload_size)40 int32_t FakeEncoder::InitEncode(const VideoCodec* config,
41 int32_t number_of_cores,
42 size_t max_payload_size) {
43 config_ = *config;
44 target_bitrate_kbps_ = config_.startBitrate;
45 return 0;
46 }
47
Encode(const VideoFrame & input_image,const CodecSpecificInfo * codec_specific_info,const std::vector<FrameType> * frame_types)48 int32_t FakeEncoder::Encode(const VideoFrame& input_image,
49 const CodecSpecificInfo* codec_specific_info,
50 const std::vector<FrameType>* frame_types) {
51 assert(config_.maxFramerate > 0);
52 int64_t time_since_last_encode_ms = 1000 / config_.maxFramerate;
53 int64_t time_now_ms = clock_->TimeInMilliseconds();
54 const bool first_encode = last_encode_time_ms_ == 0;
55 if (!first_encode) {
56 // For all frames but the first we can estimate the display time by looking
57 // at the display time of the previous frame.
58 time_since_last_encode_ms = time_now_ms - last_encode_time_ms_;
59 }
60 if (time_since_last_encode_ms > 3 * 1000 / config_.maxFramerate) {
61 // Rudimentary check to make sure we don't widely overshoot bitrate target
62 // when resuming encoding after a suspension.
63 time_since_last_encode_ms = 3 * 1000 / config_.maxFramerate;
64 }
65
66 size_t bits_available =
67 static_cast<size_t>(target_bitrate_kbps_ * time_since_last_encode_ms);
68 size_t min_bits = static_cast<size_t>(
69 config_.simulcastStream[0].minBitrate * time_since_last_encode_ms);
70 if (bits_available < min_bits)
71 bits_available = min_bits;
72 size_t max_bits =
73 static_cast<size_t>(max_target_bitrate_kbps_ * time_since_last_encode_ms);
74 if (max_bits > 0 && max_bits < bits_available)
75 bits_available = max_bits;
76 last_encode_time_ms_ = time_now_ms;
77
78 assert(config_.numberOfSimulcastStreams > 0);
79 for (unsigned char i = 0; i < config_.numberOfSimulcastStreams; ++i) {
80 CodecSpecificInfo specifics;
81 memset(&specifics, 0, sizeof(specifics));
82 specifics.codecType = kVideoCodecGeneric;
83 specifics.codecSpecific.generic.simulcast_idx = i;
84 size_t min_stream_bits = static_cast<size_t>(
85 config_.simulcastStream[i].minBitrate * time_since_last_encode_ms);
86 size_t max_stream_bits = static_cast<size_t>(
87 config_.simulcastStream[i].maxBitrate * time_since_last_encode_ms);
88 size_t stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
89 bits_available;
90 size_t stream_bytes = (stream_bits + 7) / 8;
91 if (first_encode) {
92 // The first frame is a key frame and should be larger.
93 // TODO(holmer): The FakeEncoder should store the bits_available between
94 // encodes so that it can compensate for oversized frames.
95 stream_bytes *= 10;
96 }
97 if (stream_bytes > sizeof(encoded_buffer_))
98 stream_bytes = sizeof(encoded_buffer_);
99
100 EncodedImage encoded(
101 encoded_buffer_, stream_bytes, sizeof(encoded_buffer_));
102 encoded._timeStamp = input_image.timestamp();
103 encoded.capture_time_ms_ = input_image.render_time_ms();
104 encoded._frameType = (*frame_types)[i];
105 encoded._encodedWidth = config_.simulcastStream[i].width;
106 encoded._encodedHeight = config_.simulcastStream[i].height;
107 // Always encode something on the first frame.
108 if (min_stream_bits > bits_available && i > 0)
109 continue;
110 assert(callback_ != NULL);
111 if (callback_->Encoded(encoded, &specifics, NULL) != 0)
112 return -1;
113 bits_available -= std::min(encoded._length * 8, bits_available);
114 }
115 return 0;
116 }
117
RegisterEncodeCompleteCallback(EncodedImageCallback * callback)118 int32_t FakeEncoder::RegisterEncodeCompleteCallback(
119 EncodedImageCallback* callback) {
120 callback_ = callback;
121 return 0;
122 }
123
Release()124 int32_t FakeEncoder::Release() { return 0; }
125
SetChannelParameters(uint32_t packet_loss,int64_t rtt)126 int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int64_t rtt) {
127 return 0;
128 }
129
SetRates(uint32_t new_target_bitrate,uint32_t framerate)130 int32_t FakeEncoder::SetRates(uint32_t new_target_bitrate, uint32_t framerate) {
131 target_bitrate_kbps_ = new_target_bitrate;
132 return 0;
133 }
134
135 const char* FakeEncoder::kImplementationName = "fake_encoder";
ImplementationName() const136 const char* FakeEncoder::ImplementationName() const {
137 return kImplementationName;
138 }
139
FakeH264Encoder(Clock * clock)140 FakeH264Encoder::FakeH264Encoder(Clock* clock)
141 : FakeEncoder(clock), callback_(NULL), idr_counter_(0) {
142 FakeEncoder::RegisterEncodeCompleteCallback(this);
143 }
144
RegisterEncodeCompleteCallback(EncodedImageCallback * callback)145 int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
146 EncodedImageCallback* callback) {
147 callback_ = callback;
148 return 0;
149 }
150
Encoded(const EncodedImage & encoded_image,const CodecSpecificInfo * codec_specific_info,const RTPFragmentationHeader * fragments)151 int32_t FakeH264Encoder::Encoded(const EncodedImage& encoded_image,
152 const CodecSpecificInfo* codec_specific_info,
153 const RTPFragmentationHeader* fragments) {
154 const size_t kSpsSize = 8;
155 const size_t kPpsSize = 11;
156 const int kIdrFrequency = 10;
157 RTPFragmentationHeader fragmentation;
158 if (idr_counter_++ % kIdrFrequency == 0 &&
159 encoded_image._length > kSpsSize + kPpsSize + 1) {
160 const size_t kNumSlices = 3;
161 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
162 fragmentation.fragmentationOffset[0] = 0;
163 fragmentation.fragmentationLength[0] = kSpsSize;
164 fragmentation.fragmentationOffset[1] = kSpsSize;
165 fragmentation.fragmentationLength[1] = kPpsSize;
166 fragmentation.fragmentationOffset[2] = kSpsSize + kPpsSize;
167 fragmentation.fragmentationLength[2] =
168 encoded_image._length - (kSpsSize + kPpsSize);
169 const size_t kSpsNalHeader = 0x67;
170 const size_t kPpsNalHeader = 0x68;
171 const size_t kIdrNalHeader = 0x65;
172 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kSpsNalHeader;
173 encoded_image._buffer[fragmentation.fragmentationOffset[1]] = kPpsNalHeader;
174 encoded_image._buffer[fragmentation.fragmentationOffset[2]] = kIdrNalHeader;
175 } else {
176 const size_t kNumSlices = 1;
177 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
178 fragmentation.fragmentationOffset[0] = 0;
179 fragmentation.fragmentationLength[0] = encoded_image._length;
180 const size_t kNalHeader = 0x41;
181 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kNalHeader;
182 }
183 uint8_t value = 0;
184 int fragment_counter = 0;
185 for (size_t i = 0; i < encoded_image._length; ++i) {
186 if (fragment_counter == fragmentation.fragmentationVectorSize ||
187 i != fragmentation.fragmentationOffset[fragment_counter]) {
188 encoded_image._buffer[i] = value++;
189 } else {
190 ++fragment_counter;
191 }
192 }
193 return callback_->Encoded(encoded_image, NULL, &fragmentation);
194 }
195
DelayedEncoder(Clock * clock,int delay_ms)196 DelayedEncoder::DelayedEncoder(Clock* clock, int delay_ms)
197 : test::FakeEncoder(clock),
198 delay_ms_(delay_ms) {}
199
Encode(const VideoFrame & input_image,const CodecSpecificInfo * codec_specific_info,const std::vector<FrameType> * frame_types)200 int32_t DelayedEncoder::Encode(const VideoFrame& input_image,
201 const CodecSpecificInfo* codec_specific_info,
202 const std::vector<FrameType>* frame_types) {
203 SleepMs(delay_ms_);
204 return FakeEncoder::Encode(input_image, codec_specific_info, frame_types);
205 }
206 } // namespace test
207 } // namespace webrtc
208