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/codecs/interface/video_codec_interface.h"
16
17 namespace webrtc {
18 namespace test {
19
FakeEncoder(Clock * clock)20 FakeEncoder::FakeEncoder(Clock* clock)
21 : clock_(clock),
22 callback_(NULL),
23 target_bitrate_kbps_(0),
24 max_target_bitrate_kbps_(-1),
25 last_encode_time_ms_(0) {
26 // Generate some arbitrary not-all-zero data
27 for (size_t i = 0; i < sizeof(encoded_buffer_); ++i) {
28 encoded_buffer_[i] = static_cast<uint8_t>(i);
29 }
30 }
31
~FakeEncoder()32 FakeEncoder::~FakeEncoder() {}
33
SetMaxBitrate(int max_kbps)34 void FakeEncoder::SetMaxBitrate(int max_kbps) {
35 assert(max_kbps >= -1); // max_kbps == -1 disables it.
36 max_target_bitrate_kbps_ = max_kbps;
37 }
38
InitEncode(const VideoCodec * config,int32_t number_of_cores,uint32_t max_payload_size)39 int32_t FakeEncoder::InitEncode(const VideoCodec* config,
40 int32_t number_of_cores,
41 uint32_t max_payload_size) {
42 config_ = *config;
43 target_bitrate_kbps_ = config_.startBitrate;
44 return 0;
45 }
46
Encode(const I420VideoFrame & input_image,const CodecSpecificInfo * codec_specific_info,const std::vector<VideoFrameType> * frame_types)47 int32_t FakeEncoder::Encode(
48 const I420VideoFrame& input_image,
49 const CodecSpecificInfo* codec_specific_info,
50 const std::vector<VideoFrameType>* frame_types) {
51 assert(config_.maxFramerate > 0);
52 int time_since_last_encode_ms = 1000 / config_.maxFramerate;
53 int64_t time_now_ms = clock_->TimeInMilliseconds();
54 if (last_encode_time_ms_ > 0) {
55 // For all frames but the first we can estimate the display time by looking
56 // at the display time of the previous frame.
57 time_since_last_encode_ms = time_now_ms - last_encode_time_ms_;
58 }
59
60 int bits_available = target_bitrate_kbps_ * time_since_last_encode_ms;
61 int min_bits =
62 config_.simulcastStream[0].minBitrate * time_since_last_encode_ms;
63 if (bits_available < min_bits)
64 bits_available = min_bits;
65 int max_bits = max_target_bitrate_kbps_ * time_since_last_encode_ms;
66 if (max_bits > 0 && max_bits < bits_available)
67 bits_available = max_bits;
68 last_encode_time_ms_ = time_now_ms;
69
70 assert(config_.numberOfSimulcastStreams > 0);
71 for (int i = 0; i < config_.numberOfSimulcastStreams; ++i) {
72 CodecSpecificInfo specifics;
73 memset(&specifics, 0, sizeof(specifics));
74 specifics.codecType = kVideoCodecGeneric;
75 specifics.codecSpecific.generic.simulcast_idx = i;
76 int min_stream_bits =
77 config_.simulcastStream[i].minBitrate * time_since_last_encode_ms;
78 int max_stream_bits =
79 config_.simulcastStream[i].maxBitrate * time_since_last_encode_ms;
80 int stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
81 bits_available;
82 int stream_bytes = (stream_bits + 7) / 8;
83 if (static_cast<size_t>(stream_bytes) > sizeof(encoded_buffer_))
84 stream_bytes = sizeof(encoded_buffer_);
85
86 EncodedImage encoded(
87 encoded_buffer_, stream_bytes, sizeof(encoded_buffer_));
88 encoded._timeStamp = input_image.timestamp();
89 encoded.capture_time_ms_ = input_image.render_time_ms();
90 encoded._frameType = (*frame_types)[i];
91 // Always encode something on the first frame.
92 if (min_stream_bits > bits_available && i > 0) {
93 encoded._length = 0;
94 encoded._frameType = kSkipFrame;
95 }
96 assert(callback_ != NULL);
97 if (callback_->Encoded(encoded, &specifics, NULL) != 0)
98 return -1;
99
100 bits_available -= encoded._length * 8;
101 }
102 return 0;
103 }
104
RegisterEncodeCompleteCallback(EncodedImageCallback * callback)105 int32_t FakeEncoder::RegisterEncodeCompleteCallback(
106 EncodedImageCallback* callback) {
107 callback_ = callback;
108 return 0;
109 }
110
Release()111 int32_t FakeEncoder::Release() { return 0; }
112
SetChannelParameters(uint32_t packet_loss,int rtt)113 int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int rtt) {
114 return 0;
115 }
116
SetRates(uint32_t new_target_bitrate,uint32_t framerate)117 int32_t FakeEncoder::SetRates(uint32_t new_target_bitrate, uint32_t framerate) {
118 target_bitrate_kbps_ = new_target_bitrate;
119 return 0;
120 }
121
FakeH264Encoder(Clock * clock)122 FakeH264Encoder::FakeH264Encoder(Clock* clock)
123 : FakeEncoder(clock), callback_(NULL), idr_counter_(0) {
124 FakeEncoder::RegisterEncodeCompleteCallback(this);
125 }
126
RegisterEncodeCompleteCallback(EncodedImageCallback * callback)127 int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
128 EncodedImageCallback* callback) {
129 callback_ = callback;
130 return 0;
131 }
132
Encoded(EncodedImage & encoded_image,const CodecSpecificInfo * codec_specific_info,const RTPFragmentationHeader * fragments)133 int32_t FakeH264Encoder::Encoded(EncodedImage& encoded_image,
134 const CodecSpecificInfo* codec_specific_info,
135 const RTPFragmentationHeader* fragments) {
136 const size_t kSpsSize = 8;
137 const size_t kPpsSize = 11;
138 const int kIdrFrequency = 10;
139 RTPFragmentationHeader fragmentation;
140 if (idr_counter_++ % kIdrFrequency == 0 &&
141 encoded_image._length > kSpsSize + kPpsSize + 1) {
142 const size_t kNumSlices = 3;
143 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
144 fragmentation.fragmentationOffset[0] = 0;
145 fragmentation.fragmentationLength[0] = kSpsSize;
146 fragmentation.fragmentationOffset[1] = kSpsSize;
147 fragmentation.fragmentationLength[1] = kPpsSize;
148 fragmentation.fragmentationOffset[2] = kSpsSize + kPpsSize;
149 fragmentation.fragmentationLength[2] =
150 encoded_image._length - (kSpsSize + kPpsSize);
151 const uint8_t kSpsNalHeader = 0x37;
152 const uint8_t kPpsNalHeader = 0x38;
153 const uint8_t kIdrNalHeader = 0x15;
154 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kSpsNalHeader;
155 encoded_image._buffer[fragmentation.fragmentationOffset[1]] = kPpsNalHeader;
156 encoded_image._buffer[fragmentation.fragmentationOffset[2]] = kIdrNalHeader;
157 } else {
158 const size_t kNumSlices = 1;
159 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
160 fragmentation.fragmentationOffset[0] = 0;
161 fragmentation.fragmentationLength[0] = encoded_image._length;
162 const uint8_t kNalHeader = 0x11;
163 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kNalHeader;
164 }
165 uint8_t value = 0;
166 int fragment_counter = 0;
167 for (size_t i = 0; i < encoded_image._length; ++i) {
168 if (fragment_counter == fragmentation.fragmentationVectorSize ||
169 i != fragmentation.fragmentationOffset[fragment_counter]) {
170 encoded_image._buffer[i] = value++;
171 } else {
172 ++fragment_counter;
173 }
174 }
175 return callback_->Encoded(encoded_image, NULL, &fragmentation);
176 }
177 } // namespace test
178 } // namespace webrtc
179