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
17namespace webrtc {
18namespace test {
19
20FakeEncoder::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
32FakeEncoder::~FakeEncoder() {}
33
34void FakeEncoder::SetMaxBitrate(int max_kbps) {
35  assert(max_kbps >= -1);  // max_kbps == -1 disables it.
36  max_target_bitrate_kbps_ = max_kbps;
37}
38
39int32_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
47int32_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
105int32_t FakeEncoder::RegisterEncodeCompleteCallback(
106    EncodedImageCallback* callback) {
107  callback_ = callback;
108  return 0;
109}
110
111int32_t FakeEncoder::Release() { return 0; }
112
113int32_t FakeEncoder::SetChannelParameters(uint32_t packet_loss, int rtt) {
114  return 0;
115}
116
117int32_t FakeEncoder::SetRates(uint32_t new_target_bitrate, uint32_t framerate) {
118  target_bitrate_kbps_ = new_target_bitrate;
119  return 0;
120}
121
122FakeH264Encoder::FakeH264Encoder(Clock* clock)
123    : FakeEncoder(clock), callback_(NULL), idr_counter_(0) {
124  FakeEncoder::RegisterEncodeCompleteCallback(this);
125}
126
127int32_t FakeH264Encoder::RegisterEncodeCompleteCallback(
128    EncodedImageCallback* callback) {
129  callback_ = callback;
130  return 0;
131}
132
133int32_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