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 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 33 FakeEncoder::~FakeEncoder() {} 34 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 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 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 } 117 118 int32_t FakeEncoder::RegisterEncodeCompleteCallback( 119 EncodedImageCallback* callback) { 120 callback_ = callback; 121 return 0; 122 } 123 124 int32_t FakeEncoder::Release() { return 0; } 125 126 int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int64_t rtt) { 127 return 0; 128 } 129 130 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"; 136 const char* FakeEncoder::ImplementationName() const { 137 return kImplementationName; 138 } 139 140 FakeH264Encoder::FakeH264Encoder(Clock* clock) 141 : FakeEncoder(clock), callback_(NULL), idr_counter_(0) { 142 FakeEncoder::RegisterEncodeCompleteCallback(this); 143 } 144 145 int32_t FakeH264Encoder::RegisterEncodeCompleteCallback( 146 EncodedImageCallback* callback) { 147 callback_ = callback; 148 return 0; 149 } 150 151 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 } 195 196 DelayedEncoder::DelayedEncoder(Clock* clock, int delay_ms) 197 : test::FakeEncoder(clock), 198 delay_ms_(delay_ms) {} 199 200 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
