2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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.
11 #include "webrtc/test/fake_encoder.h"
13 #include "testing/gtest/include/gtest/gtest.h"
15 #include "webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
20 FakeEncoder::FakeEncoder(Clock* clock)
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);
32 FakeEncoder::~FakeEncoder() {}
34 void FakeEncoder::SetMaxBitrate(int max_kbps) {
35 assert(max_kbps >= -1); // max_kbps == -1 disables it.
36 max_target_bitrate_kbps_ = max_kbps;
39 int32_t FakeEncoder::InitEncode(const VideoCodec* config,
40 int32_t number_of_cores,
41 uint32_t max_payload_size) {
43 target_bitrate_kbps_ = config_.startBitrate;
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 const bool first_encode = last_encode_time_ms_ == 0;
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_;
61 int bits_available = target_bitrate_kbps_ * time_since_last_encode_ms;
63 config_.simulcastStream[0].minBitrate * time_since_last_encode_ms;
64 if (bits_available < min_bits)
65 bits_available = min_bits;
66 int max_bits = max_target_bitrate_kbps_ * time_since_last_encode_ms;
67 if (max_bits > 0 && max_bits < bits_available)
68 bits_available = max_bits;
69 last_encode_time_ms_ = time_now_ms;
71 assert(config_.numberOfSimulcastStreams > 0);
72 for (int i = 0; i < config_.numberOfSimulcastStreams; ++i) {
73 CodecSpecificInfo specifics;
74 memset(&specifics, 0, sizeof(specifics));
75 specifics.codecType = kVideoCodecGeneric;
76 specifics.codecSpecific.generic.simulcast_idx = i;
78 config_.simulcastStream[i].minBitrate * time_since_last_encode_ms;
80 config_.simulcastStream[i].maxBitrate * time_since_last_encode_ms;
81 int stream_bits = (bits_available > max_stream_bits) ? max_stream_bits :
83 int stream_bytes = (stream_bits + 7) / 8;
85 // The first frame is a key frame and should be larger.
86 // TODO(holmer): The FakeEncoder should store the bits_available between
87 // encodes so that it can compensate for oversized frames.
90 if (static_cast<size_t>(stream_bytes) > sizeof(encoded_buffer_))
91 stream_bytes = sizeof(encoded_buffer_);
94 encoded_buffer_, stream_bytes, sizeof(encoded_buffer_));
95 encoded._timeStamp = input_image.timestamp();
96 encoded.capture_time_ms_ = input_image.render_time_ms();
97 encoded._frameType = (*frame_types)[i];
98 // Always encode something on the first frame.
99 if (min_stream_bits > bits_available && i > 0) {
101 encoded._frameType = kSkipFrame;
103 assert(callback_ != NULL);
104 if (callback_->Encoded(encoded, &specifics, NULL) != 0)
106 bits_available -= encoded._length * 8;
111 int32_t FakeEncoder::RegisterEncodeCompleteCallback(
112 EncodedImageCallback* callback) {
113 callback_ = callback;
117 int32_t FakeEncoder::Release() { return 0; }
119 int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int rtt) {
123 int32_t FakeEncoder::SetRates(uint32_t new_target_bitrate, uint32_t framerate) {
124 target_bitrate_kbps_ = new_target_bitrate;
128 FakeH264Encoder::FakeH264Encoder(Clock* clock)
129 : FakeEncoder(clock), callback_(NULL), idr_counter_(0) {
130 FakeEncoder::RegisterEncodeCompleteCallback(this);
133 int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
134 EncodedImageCallback* callback) {
135 callback_ = callback;
139 int32_t FakeH264Encoder::Encoded(EncodedImage& encoded_image,
140 const CodecSpecificInfo* codec_specific_info,
141 const RTPFragmentationHeader* fragments) {
142 const size_t kSpsSize = 8;
143 const size_t kPpsSize = 11;
144 const int kIdrFrequency = 10;
145 RTPFragmentationHeader fragmentation;
146 if (idr_counter_++ % kIdrFrequency == 0 &&
147 encoded_image._length > kSpsSize + kPpsSize + 1) {
148 const size_t kNumSlices = 3;
149 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
150 fragmentation.fragmentationOffset[0] = 0;
151 fragmentation.fragmentationLength[0] = kSpsSize;
152 fragmentation.fragmentationOffset[1] = kSpsSize;
153 fragmentation.fragmentationLength[1] = kPpsSize;
154 fragmentation.fragmentationOffset[2] = kSpsSize + kPpsSize;
155 fragmentation.fragmentationLength[2] =
156 encoded_image._length - (kSpsSize + kPpsSize);
157 const uint8_t kSpsNalHeader = 0x37;
158 const uint8_t kPpsNalHeader = 0x38;
159 const uint8_t kIdrNalHeader = 0x15;
160 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kSpsNalHeader;
161 encoded_image._buffer[fragmentation.fragmentationOffset[1]] = kPpsNalHeader;
162 encoded_image._buffer[fragmentation.fragmentationOffset[2]] = kIdrNalHeader;
164 const size_t kNumSlices = 1;
165 fragmentation.VerifyAndAllocateFragmentationHeader(kNumSlices);
166 fragmentation.fragmentationOffset[0] = 0;
167 fragmentation.fragmentationLength[0] = encoded_image._length;
168 const uint8_t kNalHeader = 0x11;
169 encoded_image._buffer[fragmentation.fragmentationOffset[0]] = kNalHeader;
172 int fragment_counter = 0;
173 for (size_t i = 0; i < encoded_image._length; ++i) {
174 if (fragment_counter == fragmentation.fragmentationVectorSize ||
175 i != fragmentation.fragmentationOffset[fragment_counter]) {
176 encoded_image._buffer[i] = value++;
181 return callback_->Encoded(encoded_image, NULL, &fragmentation);
184 } // namespace webrtc