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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2010 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "talk/media/base/videoadapter.h" | |
| 29 | |
| 30 #include <limits.h> // For INT_MAX | |
| 31 #include <algorithm> | |
| 32 | |
| 33 #include "talk/media/base/constants.h" | |
| 34 #include "talk/media/base/videocommon.h" | |
| 35 #include "talk/media/base/videoframe.h" | |
| 36 #include "webrtc/base/logging.h" | |
| 37 #include "webrtc/base/timeutils.h" | |
| 38 | |
| 39 namespace cricket { | |
| 40 | |
| 41 // TODO(fbarchard): Make downgrades settable | |
| 42 static const int kMaxCpuDowngrades = 2; // Downgrade at most 2 times for CPU. | |
| 43 // The number of cpu samples to require before adapting. This value depends on | |
| 44 // the cpu monitor sampling frequency being 2000ms. | |
| 45 static const int kCpuLoadMinSamples = 3; | |
| 46 // The amount of weight to give to each new cpu load sample. The lower the | |
| 47 // value, the slower we'll adapt to changing cpu conditions. | |
| 48 static const float kCpuLoadWeightCoefficient = 0.4f; | |
| 49 // The seed value for the cpu load moving average. | |
| 50 static const float kCpuLoadInitialAverage = 0.5f; | |
| 51 | |
| 52 // Desktop needs 1/8 scale for HD (1280 x 720) to QQVGA (160 x 90) | |
| 53 static const float kScaleFactors[] = { | |
| 54 1.f / 1.f, // Full size. | |
| 55 3.f / 4.f, // 3/4 scale. | |
| 56 1.f / 2.f, // 1/2 scale. | |
| 57 3.f / 8.f, // 3/8 scale. | |
| 58 1.f / 4.f, // 1/4 scale. | |
| 59 3.f / 16.f, // 3/16 scale. | |
| 60 1.f / 8.f, // 1/8 scale. | |
| 61 0.f // End of table. | |
| 62 }; | |
| 63 | |
| 64 // TODO(fbarchard): Use this table (optionally) for CPU and GD as well. | |
| 65 static const float kViewScaleFactors[] = { | |
| 66 1.f / 1.f, // Full size. | |
| 67 3.f / 4.f, // 3/4 scale. | |
| 68 2.f / 3.f, // 2/3 scale. // Allow 1080p to 720p. | |
| 69 1.f / 2.f, // 1/2 scale. | |
| 70 3.f / 8.f, // 3/8 scale. | |
| 71 1.f / 3.f, // 1/3 scale. // Allow 1080p to 360p. | |
| 72 1.f / 4.f, // 1/4 scale. | |
| 73 3.f / 16.f, // 3/16 scale. | |
| 74 1.f / 8.f, // 1/8 scale. | |
| 75 0.f // End of table. | |
| 76 }; | |
| 77 | |
| 78 const float* VideoAdapter::GetViewScaleFactors() const { | |
| 79 return scale_third_ ? kViewScaleFactors : kScaleFactors; | |
| 80 } | |
| 81 | |
| 82 // For resolutions that would scale down a little instead of up a little, | |
| 83 // bias toward scaling up a little. This will tend to choose 3/4 scale instead | |
| 84 // of 2/3 scale, when the 2/3 is not an exact match. | |
| 85 static const float kUpBias = -0.9f; | |
| 86 // Find the scale factor that, when applied to width and height, is closest | |
| 87 // to num_pixels. | |
| 88 float VideoAdapter::FindScale(const float* scale_factors, | |
| 89 const float upbias, | |
| 90 int width, int height, | |
| 91 int target_num_pixels) { | |
| 92 const float kMinNumPixels = 160 * 90; | |
| 93 if (!target_num_pixels) { | |
| 94 return 0.f; | |
| 95 } | |
| 96 float best_distance = static_cast<float>(INT_MAX); | |
| 97 float best_scale = 1.f; // Default to unscaled if nothing matches. | |
| 98 float pixels = static_cast<float>(width * height); | |
| 99 for (int i = 0; ; ++i) { | |
| 100 float scale = scale_factors[i]; | |
| 101 float test_num_pixels = pixels * scale * scale; | |
| 102 // Do not consider scale factors that produce too small images. | |
| 103 // Scale factor of 0 at end of table will also exit here. | |
| 104 if (test_num_pixels < kMinNumPixels) { | |
| 105 break; | |
| 106 } | |
| 107 float diff = target_num_pixels - test_num_pixels; | |
| 108 // If resolution is higher than desired, bias the difference based on | |
| 109 // preference for slightly larger for nearest, or avoid completely if | |
| 110 // looking for lower resolutions only. | |
| 111 if (diff < 0) { | |
| 112 diff = diff * kUpBias; | |
| 113 } | |
| 114 if (diff < best_distance) { | |
| 115 best_distance = diff; | |
| 116 best_scale = scale; | |
| 117 if (best_distance == 0) { // Found exact match. | |
| 118 break; | |
| 119 } | |
| 120 } | |
| 121 } | |
| 122 return best_scale; | |
| 123 } | |
| 124 | |
| 125 // Find the closest scale factor. | |
| 126 float VideoAdapter::FindClosestScale(int width, int height, | |
| 127 int target_num_pixels) { | |
| 128 return FindScale(kScaleFactors, kUpBias, | |
| 129 width, height, target_num_pixels); | |
| 130 } | |
| 131 | |
| 132 // Find the closest view scale factor. | |
| 133 float VideoAdapter::FindClosestViewScale(int width, int height, | |
| 134 int target_num_pixels) { | |
| 135 return FindScale(GetViewScaleFactors(), kUpBias, | |
| 136 width, height, target_num_pixels); | |
| 137 } | |
| 138 | |
| 139 // Finds the scale factor that, when applied to width and height, produces | |
| 140 // fewer than num_pixels. | |
| 141 static const float kUpAvoidBias = -1000000000.f; | |
| 142 float VideoAdapter::FindLowerScale(int width, int height, | |
| 143 int target_num_pixels) { | |
| 144 return FindScale(GetViewScaleFactors(), kUpAvoidBias, | |
| 145 width, height, target_num_pixels); | |
| 146 } | |
| 147 | |
| 148 // There are several frame sizes used by Adapter. This explains them | |
| 149 // input_format - set once by server to frame size expected from the camera. | |
| 150 // The input frame size is also updated in AdaptFrameResolution. | |
| 151 // output_format - size that output would like to be. Includes framerate. | |
| 152 // The output frame size is also updated in AdaptFrameResolution. | |
| 153 // output_num_pixels - size that output should be constrained to. Used to | |
| 154 // compute output_format from in_frame. | |
| 155 // in_frame - actual camera captured frame size, which is typically the same | |
| 156 // as input_format. This can also be rotated or cropped for aspect ratio. | |
| 157 // out_frame - actual frame output by adapter. Should be a direct scale of | |
| 158 // in_frame maintaining rotation and aspect ratio. | |
| 159 // OnOutputFormatRequest - server requests you send this resolution based on | |
| 160 // view requests. | |
| 161 // OnEncoderResolutionRequest - encoder requests you send this resolution based | |
| 162 // on bandwidth | |
| 163 // OnCpuLoadUpdated - cpu monitor requests you send this resolution based on | |
| 164 // cpu load. | |
| 165 | |
| 166 /////////////////////////////////////////////////////////////////////// | |
| 167 // Implementation of VideoAdapter | |
| 168 VideoAdapter::VideoAdapter() | |
| 169 : output_num_pixels_(INT_MAX), | |
| 170 scale_third_(false), | |
| 171 frames_in_(0), | |
| 172 frames_out_(0), | |
| 173 frames_scaled_(0), | |
| 174 adaption_changes_(0), | |
| 175 previous_width_(0), | |
| 176 previous_height_(0), | |
| 177 interval_next_frame_(0) { | |
| 178 } | |
| 179 | |
| 180 VideoAdapter::~VideoAdapter() { | |
| 181 } | |
| 182 | |
| 183 void VideoAdapter::SetInputFormat(const VideoFormat& format) { | |
| 184 rtc::CritScope cs(&critical_section_); | |
| 185 int64_t old_input_interval = input_format_.interval; | |
| 186 input_format_ = format; | |
| 187 output_format_.interval = | |
| 188 std::max(output_format_.interval, input_format_.interval); | |
| 189 if (old_input_interval != input_format_.interval) { | |
| 190 LOG(LS_INFO) << "VAdapt input interval changed from " | |
| 191 << old_input_interval << " to " << input_format_.interval; | |
| 192 } | |
| 193 } | |
| 194 | |
| 195 void CoordinatedVideoAdapter::SetInputFormat(const VideoFormat& format) { | |
| 196 int previous_width = input_format().width; | |
| 197 int previous_height = input_format().height; | |
| 198 bool is_resolution_change = previous_width > 0 && format.width > 0 && | |
| 199 (previous_width != format.width || | |
| 200 previous_height != format.height); | |
| 201 VideoAdapter::SetInputFormat(format); | |
| 202 if (is_resolution_change) { | |
| 203 int width, height; | |
| 204 // Trigger the adaptation logic again, to potentially reset the adaptation | |
| 205 // state for things like view requests that may not longer be capping | |
| 206 // output (or may now cap output). | |
| 207 AdaptToMinimumFormat(&width, &height); | |
| 208 LOG(LS_INFO) << "VAdapt Input Resolution Change: " | |
| 209 << "Previous input resolution: " | |
| 210 << previous_width << "x" << previous_height | |
| 211 << " New input resolution: " | |
| 212 << format.width << "x" << format.height | |
| 213 << " New output resolution: " | |
| 214 << width << "x" << height; | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 void CoordinatedVideoAdapter::set_cpu_smoothing(bool enable) { | |
| 219 LOG(LS_INFO) << "CPU smoothing is now " | |
| 220 << (enable ? "enabled" : "disabled"); | |
| 221 cpu_smoothing_ = enable; | |
| 222 } | |
| 223 | |
| 224 void VideoAdapter::SetOutputFormat(const VideoFormat& format) { | |
| 225 rtc::CritScope cs(&critical_section_); | |
| 226 int64_t old_output_interval = output_format_.interval; | |
| 227 output_format_ = format; | |
| 228 output_num_pixels_ = output_format_.width * output_format_.height; | |
| 229 output_format_.interval = | |
| 230 std::max(output_format_.interval, input_format_.interval); | |
| 231 if (old_output_interval != output_format_.interval) { | |
| 232 LOG(LS_INFO) << "VAdapt output interval changed from " | |
| 233 << old_output_interval << " to " << output_format_.interval; | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 const VideoFormat& VideoAdapter::input_format() { | |
| 238 rtc::CritScope cs(&critical_section_); | |
| 239 return input_format_; | |
| 240 } | |
| 241 | |
| 242 bool VideoAdapter::drops_all_frames() const { | |
| 243 return output_num_pixels_ == 0; | |
| 244 } | |
| 245 | |
| 246 const VideoFormat& VideoAdapter::output_format() { | |
| 247 rtc::CritScope cs(&critical_section_); | |
| 248 return output_format_; | |
| 249 } | |
| 250 | |
| 251 // Constrain output resolution to this many pixels overall | |
| 252 void VideoAdapter::SetOutputNumPixels(int num_pixels) { | |
| 253 output_num_pixels_ = num_pixels; | |
| 254 } | |
| 255 | |
| 256 int VideoAdapter::GetOutputNumPixels() const { | |
| 257 return output_num_pixels_; | |
| 258 } | |
| 259 | |
| 260 VideoFormat VideoAdapter::AdaptFrameResolution(int in_width, int in_height) { | |
| 261 rtc::CritScope cs(&critical_section_); | |
| 262 ++frames_in_; | |
| 263 | |
| 264 SetInputFormat(VideoFormat( | |
| 265 in_width, in_height, input_format_.interval, input_format_.fourcc)); | |
| 266 | |
| 267 // Drop the input frame if necessary. | |
| 268 bool should_drop = false; | |
| 269 if (!output_num_pixels_) { | |
| 270 // Drop all frames as the output format is 0x0. | |
| 271 should_drop = true; | |
| 272 } else { | |
| 273 // Drop some frames based on input fps and output fps. | |
| 274 // Normally output fps is less than input fps. | |
| 275 // TODO(fbarchard): Consider adjusting interval to reflect the adjusted | |
| 276 // interval between frames after dropping some frames. | |
| 277 interval_next_frame_ += input_format_.interval; | |
| 278 if (output_format_.interval > 0) { | |
| 279 if (interval_next_frame_ >= output_format_.interval) { | |
| 280 interval_next_frame_ %= output_format_.interval; | |
| 281 } else { | |
| 282 should_drop = true; | |
| 283 } | |
| 284 } | |
| 285 } | |
| 286 if (should_drop) { | |
| 287 // Show VAdapt log every 90 frames dropped. (3 seconds) | |
| 288 if ((frames_in_ - frames_out_) % 90 == 0) { | |
| 289 // TODO(fbarchard): Reduce to LS_VERBOSE when adapter info is not needed | |
| 290 // in default calls. | |
| 291 LOG(LS_INFO) << "VAdapt Drop Frame: scaled " << frames_scaled_ | |
| 292 << " / out " << frames_out_ | |
| 293 << " / in " << frames_in_ | |
| 294 << " Changes: " << adaption_changes_ | |
| 295 << " Input: " << in_width | |
| 296 << "x" << in_height | |
| 297 << " i" << input_format_.interval | |
| 298 << " Output: i" << output_format_.interval; | |
| 299 } | |
| 300 | |
| 301 return VideoFormat(); // Drop frame. | |
| 302 } | |
| 303 | |
| 304 const float scale = VideoAdapter::FindClosestViewScale( | |
| 305 in_width, in_height, output_num_pixels_); | |
| 306 const int output_width = static_cast<int>(in_width * scale + .5f); | |
| 307 const int output_height = static_cast<int>(in_height * scale + .5f); | |
| 308 | |
| 309 ++frames_out_; | |
| 310 if (scale != 1) | |
| 311 ++frames_scaled_; | |
| 312 // Show VAdapt log every 90 frames output. (3 seconds) | |
| 313 // TODO(fbarchard): Consider GetLogSeverity() to change interval to less | |
| 314 // for LS_VERBOSE and more for LS_INFO. | |
| 315 bool show = (frames_out_) % 90 == 0; | |
| 316 | |
| 317 // TODO(fbarchard): LOG the previous output resolution and track input | |
| 318 // resolution changes as well. Consider dropping the statistics into their | |
| 319 // own class which could be queried publically. | |
| 320 bool changed = false; | |
| 321 if (previous_width_ && (previous_width_ != output_width || | |
| 322 previous_height_ != output_height)) { | |
| 323 show = true; | |
| 324 ++adaption_changes_; | |
| 325 changed = true; | |
| 326 } | |
| 327 if (show) { | |
| 328 // TODO(fbarchard): Reduce to LS_VERBOSE when adapter info is not needed | |
| 329 // in default calls. | |
| 330 LOG(LS_INFO) << "VAdapt Frame: scaled " << frames_scaled_ | |
| 331 << " / out " << frames_out_ | |
| 332 << " / in " << frames_in_ | |
| 333 << " Changes: " << adaption_changes_ | |
| 334 << " Input: " << in_width | |
| 335 << "x" << in_height | |
| 336 << " i" << input_format_.interval | |
| 337 << " Scale: " << scale | |
| 338 << " Output: " << output_width | |
| 339 << "x" << output_height | |
| 340 << " i" << output_format_.interval | |
| 341 << " Changed: " << (changed ? "true" : "false"); | |
| 342 } | |
| 343 | |
| 344 output_format_.width = output_width; | |
| 345 output_format_.height = output_height; | |
| 346 previous_width_ = output_width; | |
| 347 previous_height_ = output_height; | |
| 348 | |
| 349 return output_format_; | |
| 350 } | |
| 351 | |
| 352 void VideoAdapter::set_scale_third(bool enable) { | |
| 353 LOG(LS_INFO) << "Video Adapter third scaling is now " | |
| 354 << (enable ? "enabled" : "disabled"); | |
| 355 scale_third_ = enable; | |
| 356 } | |
| 357 | |
| 358 /////////////////////////////////////////////////////////////////////// | |
| 359 // Implementation of CoordinatedVideoAdapter | |
| 360 CoordinatedVideoAdapter::CoordinatedVideoAdapter() | |
| 361 : cpu_adaptation_(true), | |
| 362 cpu_smoothing_(false), | |
| 363 gd_adaptation_(true), | |
| 364 view_adaptation_(true), | |
| 365 view_switch_(false), | |
| 366 cpu_downgrade_count_(0), | |
| 367 cpu_load_min_samples_(kCpuLoadMinSamples), | |
| 368 cpu_load_num_samples_(0), | |
| 369 high_system_threshold_(kHighSystemCpuThreshold), | |
| 370 low_system_threshold_(kLowSystemCpuThreshold), | |
| 371 process_threshold_(kProcessCpuThreshold), | |
| 372 view_desired_num_pixels_(INT_MAX), | |
| 373 view_desired_interval_(0), | |
| 374 encoder_desired_num_pixels_(INT_MAX), | |
| 375 cpu_desired_num_pixels_(INT_MAX), | |
| 376 adapt_reason_(ADAPTREASON_NONE), | |
| 377 system_load_average_(kCpuLoadInitialAverage) { | |
| 378 } | |
| 379 | |
| 380 // Helper function to UPGRADE or DOWNGRADE a number of pixels | |
| 381 void CoordinatedVideoAdapter::StepPixelCount( | |
| 382 CoordinatedVideoAdapter::AdaptRequest request, | |
| 383 int* num_pixels) { | |
| 384 switch (request) { | |
| 385 case CoordinatedVideoAdapter::DOWNGRADE: | |
| 386 *num_pixels /= 2; | |
| 387 break; | |
| 388 | |
| 389 case CoordinatedVideoAdapter::UPGRADE: | |
| 390 *num_pixels *= 2; | |
| 391 break; | |
| 392 | |
| 393 default: // No change in pixel count | |
| 394 break; | |
| 395 } | |
| 396 return; | |
| 397 } | |
| 398 | |
| 399 // Find the adaptation request of the cpu based on the load. Return UPGRADE if | |
| 400 // the load is low, DOWNGRADE if the load is high, and KEEP otherwise. | |
| 401 CoordinatedVideoAdapter::AdaptRequest CoordinatedVideoAdapter::FindCpuRequest( | |
| 402 int current_cpus, int max_cpus, | |
| 403 float process_load, float system_load) { | |
| 404 // Downgrade if system is high and plugin is at least more than midrange. | |
| 405 if (system_load >= high_system_threshold_ * max_cpus && | |
| 406 process_load >= process_threshold_ * current_cpus) { | |
| 407 return CoordinatedVideoAdapter::DOWNGRADE; | |
| 408 // Upgrade if system is low. | |
| 409 } else if (system_load < low_system_threshold_ * max_cpus) { | |
| 410 return CoordinatedVideoAdapter::UPGRADE; | |
| 411 } | |
| 412 return CoordinatedVideoAdapter::KEEP; | |
| 413 } | |
| 414 | |
| 415 // A remote view request for a new resolution. | |
| 416 void CoordinatedVideoAdapter::OnOutputFormatRequest(const VideoFormat& format) { | |
| 417 rtc::CritScope cs(&request_critical_section_); | |
| 418 if (!view_adaptation_) { | |
| 419 return; | |
| 420 } | |
| 421 // Set output for initial aspect ratio in mediachannel unittests. | |
| 422 int old_num_pixels = GetOutputNumPixels(); | |
| 423 SetOutputFormat(format); | |
| 424 SetOutputNumPixels(old_num_pixels); | |
| 425 view_desired_num_pixels_ = format.width * format.height; | |
| 426 view_desired_interval_ = format.interval; | |
| 427 int new_width, new_height; | |
| 428 bool changed = AdaptToMinimumFormat(&new_width, &new_height); | |
| 429 LOG(LS_INFO) << "VAdapt View Request: " | |
| 430 << format.width << "x" << format.height | |
| 431 << " Pixels: " << view_desired_num_pixels_ | |
| 432 << " Changed: " << (changed ? "true" : "false") | |
| 433 << " To: " << new_width << "x" << new_height; | |
| 434 } | |
| 435 | |
| 436 void CoordinatedVideoAdapter::set_cpu_load_min_samples( | |
| 437 int cpu_load_min_samples) { | |
| 438 if (cpu_load_min_samples_ != cpu_load_min_samples) { | |
| 439 LOG(LS_INFO) << "VAdapt Change Cpu Adapt Min Samples from: " | |
| 440 << cpu_load_min_samples_ << " to " | |
| 441 << cpu_load_min_samples; | |
| 442 cpu_load_min_samples_ = cpu_load_min_samples; | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 void CoordinatedVideoAdapter::set_high_system_threshold( | |
| 447 float high_system_threshold) { | |
| 448 ASSERT(high_system_threshold <= 1.0f); | |
| 449 ASSERT(high_system_threshold >= 0.0f); | |
| 450 if (high_system_threshold_ != high_system_threshold) { | |
| 451 LOG(LS_INFO) << "VAdapt Change High System Threshold from: " | |
| 452 << high_system_threshold_ << " to " << high_system_threshold; | |
| 453 high_system_threshold_ = high_system_threshold; | |
| 454 } | |
| 455 } | |
| 456 | |
| 457 void CoordinatedVideoAdapter::set_low_system_threshold( | |
| 458 float low_system_threshold) { | |
| 459 ASSERT(low_system_threshold <= 1.0f); | |
| 460 ASSERT(low_system_threshold >= 0.0f); | |
| 461 if (low_system_threshold_ != low_system_threshold) { | |
| 462 LOG(LS_INFO) << "VAdapt Change Low System Threshold from: " | |
| 463 << low_system_threshold_ << " to " << low_system_threshold; | |
| 464 low_system_threshold_ = low_system_threshold; | |
| 465 } | |
| 466 } | |
| 467 | |
| 468 void CoordinatedVideoAdapter::set_process_threshold(float process_threshold) { | |
| 469 ASSERT(process_threshold <= 1.0f); | |
| 470 ASSERT(process_threshold >= 0.0f); | |
| 471 if (process_threshold_ != process_threshold) { | |
| 472 LOG(LS_INFO) << "VAdapt Change High Process Threshold from: " | |
| 473 << process_threshold_ << " to " << process_threshold; | |
| 474 process_threshold_ = process_threshold; | |
| 475 } | |
| 476 } | |
| 477 | |
| 478 // A Bandwidth GD request for new resolution | |
| 479 void CoordinatedVideoAdapter::OnEncoderResolutionRequest( | |
| 480 int width, int height, AdaptRequest request) { | |
| 481 rtc::CritScope cs(&request_critical_section_); | |
| 482 if (!gd_adaptation_) { | |
| 483 return; | |
| 484 } | |
| 485 int old_encoder_desired_num_pixels = encoder_desired_num_pixels_; | |
| 486 if (KEEP != request) { | |
| 487 int new_encoder_desired_num_pixels = width * height; | |
| 488 int old_num_pixels = GetOutputNumPixels(); | |
| 489 if (new_encoder_desired_num_pixels != old_num_pixels) { | |
| 490 LOG(LS_VERBOSE) << "VAdapt GD resolution stale. Ignored"; | |
| 491 } else { | |
| 492 // Update the encoder desired format based on the request. | |
| 493 encoder_desired_num_pixels_ = new_encoder_desired_num_pixels; | |
| 494 StepPixelCount(request, &encoder_desired_num_pixels_); | |
| 495 } | |
| 496 } | |
| 497 int new_width, new_height; | |
| 498 bool changed = AdaptToMinimumFormat(&new_width, &new_height); | |
| 499 | |
| 500 // Ignore up or keep if no change. | |
| 501 if (DOWNGRADE != request && view_switch_ && !changed) { | |
| 502 encoder_desired_num_pixels_ = old_encoder_desired_num_pixels; | |
| 503 LOG(LS_VERBOSE) << "VAdapt ignoring GD request."; | |
| 504 } | |
| 505 | |
| 506 LOG(LS_INFO) << "VAdapt GD Request: " | |
| 507 << (DOWNGRADE == request ? "down" : | |
| 508 (UPGRADE == request ? "up" : "keep")) | |
| 509 << " From: " << width << "x" << height | |
| 510 << " Pixels: " << encoder_desired_num_pixels_ | |
| 511 << " Changed: " << (changed ? "true" : "false") | |
| 512 << " To: " << new_width << "x" << new_height; | |
| 513 } | |
| 514 | |
| 515 // A Bandwidth GD request for new resolution | |
| 516 void CoordinatedVideoAdapter::OnCpuResolutionRequest(AdaptRequest request) { | |
| 517 rtc::CritScope cs(&request_critical_section_); | |
| 518 if (!cpu_adaptation_) { | |
| 519 return; | |
| 520 } | |
| 521 // Update how many times we have downgraded due to the cpu load. | |
| 522 switch (request) { | |
| 523 case DOWNGRADE: | |
| 524 // Ignore downgrades if we have downgraded the maximum times. | |
| 525 if (cpu_downgrade_count_ < kMaxCpuDowngrades) { | |
| 526 ++cpu_downgrade_count_; | |
| 527 } else { | |
| 528 LOG(LS_VERBOSE) << "VAdapt CPU load high but do not downgrade " | |
| 529 "because maximum downgrades reached"; | |
| 530 SignalCpuAdaptationUnable(); | |
| 531 } | |
| 532 break; | |
| 533 case UPGRADE: | |
| 534 if (cpu_downgrade_count_ > 0) { | |
| 535 bool is_min = IsMinimumFormat(cpu_desired_num_pixels_); | |
| 536 if (is_min) { | |
| 537 --cpu_downgrade_count_; | |
| 538 } else { | |
| 539 LOG(LS_VERBOSE) << "VAdapt CPU load low but do not upgrade " | |
| 540 "because cpu is not limiting resolution"; | |
| 541 } | |
| 542 } else { | |
| 543 LOG(LS_VERBOSE) << "VAdapt CPU load low but do not upgrade " | |
| 544 "because minimum downgrades reached"; | |
| 545 } | |
| 546 break; | |
| 547 case KEEP: | |
| 548 default: | |
| 549 break; | |
| 550 } | |
| 551 if (KEEP != request) { | |
| 552 // TODO(fbarchard): compute stepping up/down from OutputNumPixels but | |
| 553 // clamp to inputpixels / 4 (2 steps) | |
| 554 cpu_desired_num_pixels_ = cpu_downgrade_count_ == 0 ? INT_MAX : | |
| 555 static_cast<int>(input_format().width * input_format().height >> | |
| 556 cpu_downgrade_count_); | |
| 557 } | |
| 558 int new_width, new_height; | |
| 559 bool changed = AdaptToMinimumFormat(&new_width, &new_height); | |
| 560 LOG(LS_INFO) << "VAdapt CPU Request: " | |
| 561 << (DOWNGRADE == request ? "down" : | |
| 562 (UPGRADE == request ? "up" : "keep")) | |
| 563 << " Steps: " << cpu_downgrade_count_ | |
| 564 << " Changed: " << (changed ? "true" : "false") | |
| 565 << " To: " << new_width << "x" << new_height; | |
| 566 } | |
| 567 | |
| 568 // A CPU request for new resolution | |
| 569 // TODO(fbarchard): Move outside adapter. | |
| 570 void CoordinatedVideoAdapter::OnCpuLoadUpdated( | |
| 571 int current_cpus, int max_cpus, float process_load, float system_load) { | |
| 572 rtc::CritScope cs(&request_critical_section_); | |
| 573 if (!cpu_adaptation_) { | |
| 574 return; | |
| 575 } | |
| 576 // Update the moving average of system load. Even if we aren't smoothing, | |
| 577 // we'll still calculate this information, in case smoothing is later enabled. | |
| 578 system_load_average_ = kCpuLoadWeightCoefficient * system_load + | |
| 579 (1.0f - kCpuLoadWeightCoefficient) * system_load_average_; | |
| 580 ++cpu_load_num_samples_; | |
| 581 if (cpu_smoothing_) { | |
| 582 system_load = system_load_average_; | |
| 583 } | |
| 584 AdaptRequest request = FindCpuRequest(current_cpus, max_cpus, | |
| 585 process_load, system_load); | |
| 586 // Make sure we're not adapting too quickly. | |
| 587 if (request != KEEP) { | |
| 588 if (cpu_load_num_samples_ < cpu_load_min_samples_) { | |
| 589 LOG(LS_VERBOSE) << "VAdapt CPU load high/low but do not adapt until " | |
| 590 << (cpu_load_min_samples_ - cpu_load_num_samples_) | |
| 591 << " more samples"; | |
| 592 request = KEEP; | |
| 593 } | |
| 594 } | |
| 595 | |
| 596 OnCpuResolutionRequest(request); | |
| 597 } | |
| 598 | |
| 599 // Called by cpu adapter on up requests. | |
| 600 bool CoordinatedVideoAdapter::IsMinimumFormat(int pixels) { | |
| 601 // Find closest scale factor that matches input resolution to min_num_pixels | |
| 602 // and set that for output resolution. This is not needed for VideoAdapter, | |
| 603 // but provides feedback to unittests and users on expected resolution. | |
| 604 // Actual resolution is based on input frame. | |
| 605 VideoFormat new_output = output_format(); | |
| 606 VideoFormat input = input_format(); | |
| 607 if (input_format().IsSize0x0()) { | |
| 608 input = new_output; | |
| 609 } | |
| 610 float scale = 1.0f; | |
| 611 if (!input.IsSize0x0()) { | |
| 612 scale = FindClosestScale(input.width, | |
| 613 input.height, | |
| 614 pixels); | |
| 615 } | |
| 616 new_output.width = static_cast<int>(input.width * scale + .5f); | |
| 617 new_output.height = static_cast<int>(input.height * scale + .5f); | |
| 618 int new_pixels = new_output.width * new_output.height; | |
| 619 int num_pixels = GetOutputNumPixels(); | |
| 620 return new_pixels <= num_pixels; | |
| 621 } | |
| 622 | |
| 623 // Called by all coordinators when there is a change. | |
| 624 bool CoordinatedVideoAdapter::AdaptToMinimumFormat(int* new_width, | |
| 625 int* new_height) { | |
| 626 VideoFormat new_output = output_format(); | |
| 627 VideoFormat input = input_format(); | |
| 628 if (input_format().IsSize0x0()) { | |
| 629 input = new_output; | |
| 630 } | |
| 631 int old_num_pixels = GetOutputNumPixels(); | |
| 632 int min_num_pixels = INT_MAX; | |
| 633 adapt_reason_ = ADAPTREASON_NONE; | |
| 634 | |
| 635 // Reduce resolution based on encoder bandwidth (GD). | |
| 636 if (encoder_desired_num_pixels_ && | |
| 637 (encoder_desired_num_pixels_ < min_num_pixels)) { | |
| 638 adapt_reason_ |= ADAPTREASON_BANDWIDTH; | |
| 639 min_num_pixels = encoder_desired_num_pixels_; | |
| 640 } | |
| 641 // Reduce resolution based on CPU. | |
| 642 if (cpu_adaptation_ && cpu_desired_num_pixels_ && | |
| 643 (cpu_desired_num_pixels_ <= min_num_pixels)) { | |
| 644 if (cpu_desired_num_pixels_ < min_num_pixels) { | |
| 645 adapt_reason_ = ADAPTREASON_CPU; | |
| 646 } else { | |
| 647 adapt_reason_ |= ADAPTREASON_CPU; | |
| 648 } | |
| 649 min_num_pixels = cpu_desired_num_pixels_; | |
| 650 } | |
| 651 // Round resolution for GD or CPU to allow 1/2 to map to 9/16. | |
| 652 if (!input.IsSize0x0() && min_num_pixels != INT_MAX) { | |
| 653 float scale = FindClosestScale(input.width, input.height, min_num_pixels); | |
| 654 min_num_pixels = static_cast<int>(input.width * scale + .5f) * | |
| 655 static_cast<int>(input.height * scale + .5f); | |
| 656 } | |
| 657 // Reduce resolution based on View Request. | |
| 658 if (view_desired_num_pixels_ <= min_num_pixels) { | |
| 659 if (view_desired_num_pixels_ < min_num_pixels) { | |
| 660 adapt_reason_ = ADAPTREASON_VIEW; | |
| 661 } else { | |
| 662 adapt_reason_ |= ADAPTREASON_VIEW; | |
| 663 } | |
| 664 min_num_pixels = view_desired_num_pixels_; | |
| 665 } | |
| 666 // Snap to a scale factor. | |
| 667 float scale = 1.0f; | |
| 668 if (!input.IsSize0x0()) { | |
| 669 scale = FindLowerScale(input.width, input.height, min_num_pixels); | |
| 670 min_num_pixels = static_cast<int>(input.width * scale + .5f) * | |
| 671 static_cast<int>(input.height * scale + .5f); | |
| 672 } | |
| 673 if (scale == 1.0f) { | |
| 674 adapt_reason_ = ADAPTREASON_NONE; | |
| 675 } | |
| 676 *new_width = new_output.width = static_cast<int>(input.width * scale + .5f); | |
| 677 *new_height = new_output.height = static_cast<int>(input.height * scale + | |
| 678 .5f); | |
| 679 SetOutputNumPixels(min_num_pixels); | |
| 680 | |
| 681 new_output.interval = view_desired_interval_; | |
| 682 SetOutputFormat(new_output); | |
| 683 int new_num_pixels = GetOutputNumPixels(); | |
| 684 bool changed = new_num_pixels != old_num_pixels; | |
| 685 | |
| 686 static const char* kReasons[8] = { | |
| 687 "None", | |
| 688 "CPU", | |
| 689 "BANDWIDTH", | |
| 690 "CPU+BANDWIDTH", | |
| 691 "VIEW", | |
| 692 "CPU+VIEW", | |
| 693 "BANDWIDTH+VIEW", | |
| 694 "CPU+BANDWIDTH+VIEW", | |
| 695 }; | |
| 696 | |
| 697 LOG(LS_VERBOSE) << "VAdapt Status View: " << view_desired_num_pixels_ | |
| 698 << " GD: " << encoder_desired_num_pixels_ | |
| 699 << " CPU: " << cpu_desired_num_pixels_ | |
| 700 << " Pixels: " << min_num_pixels | |
| 701 << " Input: " << input.width | |
| 702 << "x" << input.height | |
| 703 << " Scale: " << scale | |
| 704 << " Resolution: " << new_output.width | |
| 705 << "x" << new_output.height | |
| 706 << " Changed: " << (changed ? "true" : "false") | |
| 707 << " Reason: " << kReasons[adapt_reason_]; | |
| 708 | |
| 709 if (changed) { | |
| 710 // When any adaptation occurs, historic CPU load levels are no longer | |
| 711 // accurate. Clear out our state so we can re-learn at the new normal. | |
| 712 cpu_load_num_samples_ = 0; | |
| 713 system_load_average_ = kCpuLoadInitialAverage; | |
| 714 } | |
| 715 | |
| 716 return changed; | |
| 717 } | |
| 718 | |
| 719 } // namespace cricket | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1587193006:
Move talk/media to webrtc/media (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master