Add fuzzer to validate libvpx vp9 encoder wrapper
Fix simulcast svc controller to reuse dropped frame configuration,
same as full svc and k-svc controllers do.
This fuzzer reminded the issue was still there.
Bug: webrtc:11999
Change-Id: I74156bd743124723562e99deb48de5b5018a81d0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/212281
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33568}
diff --git a/modules/video_coding/svc/scalability_structure_simulcast.cc b/modules/video_coding/svc/scalability_structure_simulcast.cc
index 13751da..c236066 100644
--- a/modules/video_coding/svc/scalability_structure_simulcast.cc
+++ b/modules/video_coding/svc/scalability_structure_simulcast.cc
@@ -137,7 +137,7 @@
}
configs.emplace_back();
ScalableVideoController::LayerFrameConfig& config = configs.back();
- config.S(sid).T(0);
+ config.Id(current_pattern).S(sid).T(0);
if (can_reference_t0_frame_for_spatial_id_[sid]) {
config.ReferenceAndUpdate(BufferIndex(sid, /*tid=*/0));
@@ -155,7 +155,10 @@
}
configs.emplace_back();
ScalableVideoController::LayerFrameConfig& config = configs.back();
- config.S(sid).T(1).Reference(BufferIndex(sid, /*tid=*/0));
+ config.Id(current_pattern)
+ .S(sid)
+ .T(1)
+ .Reference(BufferIndex(sid, /*tid=*/0));
// Save frame only if there is a higher temporal layer that may need it.
if (num_temporal_layers_ > 2) {
config.Update(BufferIndex(sid, /*tid=*/1));
@@ -171,7 +174,7 @@
}
configs.emplace_back();
ScalableVideoController::LayerFrameConfig& config = configs.back();
- config.S(sid).T(2);
+ config.Id(current_pattern).S(sid).T(2);
if (can_reference_t1_frame_for_spatial_id_[sid]) {
config.Reference(BufferIndex(sid, /*tid=*/1));
} else {
@@ -184,12 +187,12 @@
break;
}
- last_pattern_ = current_pattern;
return configs;
}
GenericFrameInfo ScalabilityStructureSimulcast::OnEncodeDone(
const LayerFrameConfig& config) {
+ last_pattern_ = static_cast<FramePattern>(config.Id());
if (config.TemporalId() == 1) {
can_reference_t1_frame_for_spatial_id_.set(config.SpatialId());
}
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index e08ba3c..ee2a3f7 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -632,6 +632,30 @@
seed_corpus = "corpora/rtpdump-corpus/vp8"
}
+if (rtc_build_libvpx) {
+ webrtc_fuzzer_test("vp9_encoder_references_fuzzer") {
+ sources = [ "vp9_encoder_references_fuzzer.cc" ]
+ deps = [
+ "..:test_support",
+ "../../api:array_view",
+ "../../api/transport:webrtc_key_value_config",
+ "../../api/video:video_frame",
+ "../../api/video_codecs:video_codecs_api",
+ "../../modules/video_coding:frame_dependencies_calculator",
+ "../../modules/video_coding:mock_libvpx_interface",
+ "../../modules/video_coding:webrtc_vp9",
+ "../../rtc_base:safe_compare",
+ rtc_libvpx_dir,
+ ]
+ absl_deps = [
+ "//third_party/abseil-cpp/absl/algorithm:container",
+ "//third_party/abseil-cpp/absl/base:core_headers",
+ "//third_party/abseil-cpp/absl/container:inlined_vector",
+ ]
+ defines = [ "RTC_ENABLE_VP9" ]
+ }
+}
+
webrtc_fuzzer_test("vp9_replay_fuzzer") {
sources = [ "vp9_replay_fuzzer.cc" ]
deps = [
diff --git a/test/fuzzers/vp9_encoder_references_fuzzer.cc b/test/fuzzers/vp9_encoder_references_fuzzer.cc
new file mode 100644
index 0000000..9300ddf
--- /dev/null
+++ b/test/fuzzers/vp9_encoder_references_fuzzer.cc
@@ -0,0 +1,480 @@
+/*
+ * Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdint.h>
+
+#include "absl/algorithm/container.h"
+#include "absl/base/macros.h"
+#include "absl/container/inlined_vector.h"
+#include "api/array_view.h"
+#include "api/transport/webrtc_key_value_config.h"
+#include "api/video/video_frame.h"
+#include "api/video_codecs/video_codec.h"
+#include "api/video_codecs/video_encoder.h"
+#include "modules/video_coding/codecs/interface/mock_libvpx_interface.h"
+#include "modules/video_coding/codecs/vp9/libvpx_vp9_encoder.h"
+#include "modules/video_coding/frame_dependencies_calculator.h"
+#include "rtc_base/numerics/safe_compare.h"
+#include "test/fuzzers/fuzz_data_helper.h"
+#include "test/gmock.h"
+
+// Fuzzer simulates various svc configurations and libvpx encoder droping
+// layer frames.
+// Validates vp9 encoder wrapper produces consistent frame references.
+namespace webrtc {
+namespace {
+
+using test::FuzzDataHelper;
+using ::testing::NiceMock;
+
+class FrameValidator : public EncodedImageCallback {
+ public:
+ ~FrameValidator() override = default;
+
+ Result OnEncodedImage(const EncodedImage& encoded_image,
+ const CodecSpecificInfo* codec_specific_info) override {
+ RTC_CHECK(codec_specific_info);
+ RTC_CHECK_EQ(codec_specific_info->codecType, kVideoCodecVP9);
+ if (codec_specific_info->codecSpecific.VP9.first_frame_in_picture) {
+ ++picture_id_;
+ }
+ LayerFrame layer_frame;
+ layer_frame.picture_id = picture_id_;
+ layer_frame.spatial_id = encoded_image.SpatialIndex().value_or(0);
+ layer_frame.info = *codec_specific_info;
+ CheckVp9References(layer_frame);
+
+ if (layer_frame.info.generic_frame_info.has_value()) {
+ int64_t frame_id = frames_.size();
+ layer_frame.frame_dependencies =
+ dependencies_calculator_.FromBuffersUsage(
+ frame_id, layer_frame.info.generic_frame_info->encoder_buffers);
+
+ CheckGenericReferences(layer_frame);
+ CheckGenericAndCodecSpecificReferencesAreConsistent(layer_frame);
+ }
+
+ frames_.push_back(std::move(layer_frame));
+ return Result(Result::OK);
+ }
+
+ private:
+ struct LayerFrame {
+ const CodecSpecificInfoVP9& vp9() const { return info.codecSpecific.VP9; }
+ int temporal_id() const {
+ return vp9().temporal_idx == kNoTemporalIdx ? 0 : vp9().temporal_idx;
+ }
+
+ int64_t picture_id;
+ int spatial_id;
+ absl::InlinedVector<int64_t, 5> frame_dependencies;
+ CodecSpecificInfo info;
+ };
+
+ void CheckVp9References(const LayerFrame& layer_frame) {
+ if (layer_frame.vp9().inter_layer_predicted) {
+ RTC_CHECK(!frames_.empty());
+ const LayerFrame& previous_frame = frames_.back();
+ RTC_CHECK(!previous_frame.vp9().non_ref_for_inter_layer_pred);
+ RTC_CHECK_EQ(layer_frame.picture_id, previous_frame.picture_id);
+ }
+ if (!frames_.empty() &&
+ frames_.back().picture_id == layer_frame.picture_id) {
+ RTC_CHECK_GT(layer_frame.spatial_id, frames_.back().spatial_id);
+ // The check below would fail for temporal shift structures. Remove it or
+ // move it to !flexible_mode section when vp9 encoder starts supporting
+ // such structures.
+ RTC_CHECK_EQ(layer_frame.vp9().temporal_idx,
+ frames_.back().vp9().temporal_idx);
+ }
+ if (!layer_frame.vp9().flexible_mode) {
+ if (layer_frame.vp9().gof.num_frames_in_gof > 0) {
+ gof_.CopyGofInfoVP9(layer_frame.vp9().gof);
+ }
+ RTC_CHECK_EQ(gof_.temporal_idx[layer_frame.vp9().gof_idx],
+ layer_frame.temporal_id());
+ }
+ }
+
+ void CheckGenericReferences(const LayerFrame& layer_frame) const {
+ const GenericFrameInfo& generic_info = *layer_frame.info.generic_frame_info;
+ for (int64_t dependency_frame_id : layer_frame.frame_dependencies) {
+ RTC_CHECK_GE(dependency_frame_id, 0);
+ const LayerFrame& dependency = frames_[dependency_frame_id];
+ RTC_CHECK(dependency.info.generic_frame_info.has_value());
+ RTC_CHECK_GE(generic_info.spatial_id,
+ dependency.info.generic_frame_info->spatial_id);
+ RTC_CHECK_GE(generic_info.temporal_id,
+ dependency.info.generic_frame_info->temporal_id);
+ }
+ }
+
+ void CheckGenericAndCodecSpecificReferencesAreConsistent(
+ const LayerFrame& layer_frame) const {
+ const GenericFrameInfo& generic_info = *layer_frame.info.generic_frame_info;
+ RTC_CHECK_EQ(generic_info.spatial_id, layer_frame.spatial_id);
+ RTC_CHECK_EQ(generic_info.temporal_id, layer_frame.temporal_id());
+ auto picture_id_diffs = rtc::MakeArrayView(layer_frame.vp9().p_diff,
+ layer_frame.vp9().num_ref_pics);
+ RTC_CHECK_EQ(layer_frame.frame_dependencies.size(),
+ picture_id_diffs.size() +
+ (layer_frame.vp9().inter_layer_predicted ? 1 : 0));
+ for (int64_t dependency_frame_id : layer_frame.frame_dependencies) {
+ RTC_CHECK_GE(dependency_frame_id, 0);
+ const LayerFrame& dependency = frames_[dependency_frame_id];
+ if (dependency.spatial_id != layer_frame.spatial_id) {
+ RTC_CHECK(layer_frame.vp9().inter_layer_predicted);
+ RTC_CHECK_EQ(layer_frame.picture_id, dependency.picture_id);
+ RTC_CHECK_GT(layer_frame.spatial_id, dependency.spatial_id);
+ } else {
+ RTC_CHECK(layer_frame.vp9().inter_pic_predicted);
+ RTC_CHECK_EQ(layer_frame.spatial_id, dependency.spatial_id);
+ RTC_CHECK(absl::c_linear_search(
+ picture_id_diffs, layer_frame.picture_id - dependency.picture_id));
+ }
+ }
+ }
+
+ GofInfoVP9 gof_;
+ int64_t picture_id_;
+ FrameDependenciesCalculator dependencies_calculator_;
+ std::vector<LayerFrame> frames_;
+};
+
+class FieldTrials : public WebRtcKeyValueConfig {
+ public:
+ explicit FieldTrials(FuzzDataHelper& config)
+ : flags_(config.ReadOrDefaultValue<uint8_t>(0)) {}
+
+ ~FieldTrials() override = default;
+ std::string Lookup(absl::string_view key) const override {
+ static constexpr absl::string_view kBinaryFieldTrials[] = {
+ "WebRTC-Vp9DependencyDescriptor",
+ "WebRTC-Vp9ExternalRefCtrl",
+ "WebRTC-Vp9IssueKeyFrameOnLayerDeactivation",
+ };
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kBinaryFieldTrials); ++i) {
+ if (key == kBinaryFieldTrials[i]) {
+ return (flags_ & (1u << i)) ? "Enabled" : "Disabled";
+ }
+ }
+
+ // Ignore following field trials.
+ if (key == "WebRTC-CongestionWindow" ||
+ key == "WebRTC-UseBaseHeavyVP8TL3RateAllocation" ||
+ key == "WebRTC-SimulcastUpswitchHysteresisPercent" ||
+ key == "WebRTC-SimulcastScreenshareUpswitchHysteresisPercent" ||
+ key == "WebRTC-VideoRateControl" ||
+ key == "WebRTC-VP9-PerformanceFlags" ||
+ key == "WebRTC-VP9VariableFramerateScreenshare" ||
+ key == "WebRTC-VP9QualityScaler") {
+ return "";
+ }
+ // Crash when using unexpected field trial to decide if it should be fuzzed
+ // or have a constant value.
+ RTC_CHECK(false) << "Unfuzzed field trial " << key << "\n";
+ }
+
+ private:
+ const uint8_t flags_;
+};
+
+VideoCodec CodecSettings(FuzzDataHelper& rng) {
+ uint16_t config = rng.ReadOrDefaultValue<uint16_t>(0);
+ // Test up to to 4 spatial and 4 temporal layers.
+ int num_spatial_layers = 1 + (config & 0b11);
+ int num_temporal_layers = 1 + ((config >> 2) & 0b11);
+
+ VideoCodec codec_settings = {};
+ codec_settings.codecType = kVideoCodecVP9;
+ codec_settings.maxFramerate = 30;
+ codec_settings.width = 320 << (num_spatial_layers - 1);
+ codec_settings.height = 180 << (num_spatial_layers - 1);
+ if (num_spatial_layers > 1) {
+ for (int sid = 0; sid < num_spatial_layers; ++sid) {
+ SpatialLayer& spatial_layer = codec_settings.spatialLayers[sid];
+ codec_settings.width = 320 << sid;
+ codec_settings.height = 180 << sid;
+ spatial_layer.maxFramerate = codec_settings.maxFramerate;
+ spatial_layer.numberOfTemporalLayers = num_temporal_layers;
+ }
+ }
+ codec_settings.VP9()->numberOfSpatialLayers = num_spatial_layers;
+ codec_settings.VP9()->numberOfTemporalLayers = num_temporal_layers;
+ int inter_layer_pred = (config >> 4) & 0b11;
+ // There are only 3 valid values.
+ codec_settings.VP9()->interLayerPred = static_cast<InterLayerPredMode>(
+ inter_layer_pred < 3 ? inter_layer_pred : 0);
+ codec_settings.VP9()->flexibleMode = (config & (1u << 6)) != 0;
+ codec_settings.VP9()->frameDroppingOn = (config & (1u << 7)) != 0;
+ codec_settings.mode = VideoCodecMode::kRealtimeVideo;
+ return codec_settings;
+}
+
+VideoEncoder::Settings EncoderSettings() {
+ return VideoEncoder::Settings(VideoEncoder::Capabilities(false),
+ /*number_of_cores=*/1,
+ /*max_payload_size=*/0);
+}
+
+struct LibvpxState {
+ LibvpxState() {
+ pkt.kind = VPX_CODEC_CX_FRAME_PKT;
+ pkt.data.frame.buf = pkt_buffer;
+ pkt.data.frame.sz = ABSL_ARRAYSIZE(pkt_buffer);
+ layer_id.spatial_layer_id = -1;
+ }
+
+ uint8_t pkt_buffer[1000] = {};
+ vpx_codec_enc_cfg_t config = {};
+ vpx_codec_priv_output_cx_pkt_cb_pair_t callback = {};
+ vpx_image_t img = {};
+ vpx_svc_ref_frame_config_t ref_config = {};
+ vpx_svc_layer_id_t layer_id = {};
+ vpx_svc_frame_drop_t frame_drop = {};
+ vpx_codec_cx_pkt pkt = {};
+};
+
+class StubLibvpx : public NiceMock<MockLibvpxInterface> {
+ public:
+ explicit StubLibvpx(LibvpxState* state) : state_(state) { RTC_CHECK(state_); }
+
+ vpx_codec_err_t codec_enc_config_default(vpx_codec_iface_t* iface,
+ vpx_codec_enc_cfg_t* cfg,
+ unsigned int usage) const override {
+ state_->config = *cfg;
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_enc_init(vpx_codec_ctx_t* ctx,
+ vpx_codec_iface_t* iface,
+ const vpx_codec_enc_cfg_t* cfg,
+ vpx_codec_flags_t flags) const override {
+ RTC_CHECK(ctx);
+ ctx->err = VPX_CODEC_OK;
+ return VPX_CODEC_OK;
+ }
+
+ vpx_image_t* img_wrap(vpx_image_t* img,
+ vpx_img_fmt_t fmt,
+ unsigned int d_w,
+ unsigned int d_h,
+ unsigned int stride_align,
+ unsigned char* img_data) const override {
+ state_->img.fmt = fmt;
+ state_->img.d_w = d_w;
+ state_->img.d_h = d_h;
+ return &state_->img;
+ }
+
+ vpx_codec_err_t codec_encode(vpx_codec_ctx_t* ctx,
+ const vpx_image_t* img,
+ vpx_codec_pts_t pts,
+ uint64_t duration,
+ vpx_enc_frame_flags_t flags,
+ uint64_t deadline) const override {
+ if (flags & VPX_EFLAG_FORCE_KF) {
+ state_->pkt.data.frame.flags = VPX_FRAME_IS_KEY;
+ } else {
+ state_->pkt.data.frame.flags = 0;
+ }
+ state_->pkt.data.frame.duration = duration;
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_control(vpx_codec_ctx_t* ctx,
+ vp8e_enc_control_id ctrl_id,
+ void* param) const override {
+ if (ctrl_id == VP9E_REGISTER_CX_CALLBACK) {
+ state_->callback =
+ *reinterpret_cast<vpx_codec_priv_output_cx_pkt_cb_pair_t*>(param);
+ }
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_control(
+ vpx_codec_ctx_t* ctx,
+ vp8e_enc_control_id ctrl_id,
+ vpx_svc_ref_frame_config_t* param) const override {
+ switch (ctrl_id) {
+ case VP9E_SET_SVC_REF_FRAME_CONFIG:
+ state_->ref_config = *param;
+ break;
+ case VP9E_GET_SVC_REF_FRAME_CONFIG:
+ *param = state_->ref_config;
+ break;
+ default:
+ break;
+ }
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_control(vpx_codec_ctx_t* ctx,
+ vp8e_enc_control_id ctrl_id,
+ vpx_svc_layer_id_t* param) const override {
+ switch (ctrl_id) {
+ case VP9E_SET_SVC_LAYER_ID:
+ state_->layer_id = *param;
+ break;
+ case VP9E_GET_SVC_LAYER_ID:
+ *param = state_->layer_id;
+ break;
+ default:
+ break;
+ }
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_control(vpx_codec_ctx_t* ctx,
+ vp8e_enc_control_id ctrl_id,
+ vpx_svc_frame_drop_t* param) const override {
+ if (ctrl_id == VP9E_SET_SVC_FRAME_DROP_LAYER) {
+ state_->frame_drop = *param;
+ }
+ return VPX_CODEC_OK;
+ }
+
+ vpx_codec_err_t codec_enc_config_set(
+ vpx_codec_ctx_t* ctx,
+ const vpx_codec_enc_cfg_t* cfg) const override {
+ state_->config = *cfg;
+ return VPX_CODEC_OK;
+ }
+
+ private:
+ LibvpxState* const state_;
+};
+
+enum Actions {
+ kEncode,
+ kSetRates,
+};
+
+// When a layer frame is marked for drop, drops all layer frames from that
+// pictures with larger spatial ids.
+constexpr bool DropAbove(uint8_t layers_mask, int sid) {
+ uint8_t full_mask = (uint8_t{1} << (sid + 1)) - 1;
+ return (layers_mask & full_mask) != full_mask;
+}
+// inline unittests
+static_assert(DropAbove(0b1011, /*sid=*/0) == false, "");
+static_assert(DropAbove(0b1011, /*sid=*/1) == false, "");
+static_assert(DropAbove(0b1011, /*sid=*/2) == true, "");
+static_assert(DropAbove(0b1011, /*sid=*/3) == true, "");
+
+// When a layer frame is marked for drop, drops all layer frames from that
+// pictures with smaller spatial ids.
+constexpr bool DropBelow(uint8_t layers_mask, int sid, int num_layers) {
+ return (layers_mask >> sid) != (1 << (num_layers - sid)) - 1;
+}
+// inline unittests
+static_assert(DropBelow(0b1101, /*sid=*/0, 4) == true, "");
+static_assert(DropBelow(0b1101, /*sid=*/1, 4) == true, "");
+static_assert(DropBelow(0b1101, /*sid=*/2, 4) == false, "");
+static_assert(DropBelow(0b1101, /*sid=*/3, 4) == false, "");
+
+} // namespace
+
+void FuzzOneInput(const uint8_t* data, size_t size) {
+ FuzzDataHelper helper(rtc::MakeArrayView(data, size));
+
+ FrameValidator validator;
+ FieldTrials field_trials(helper);
+ // Setup call callbacks for the fake
+ LibvpxState state;
+
+ // Initialize encoder
+ LibvpxVp9Encoder encoder(cricket::VideoCodec(),
+ std::make_unique<StubLibvpx>(&state), field_trials);
+ VideoCodec codec = CodecSettings(helper);
+ if (encoder.InitEncode(&codec, EncoderSettings()) != WEBRTC_VIDEO_CODEC_OK) {
+ return;
+ }
+ RTC_CHECK_EQ(encoder.RegisterEncodeCompleteCallback(&validator),
+ WEBRTC_VIDEO_CODEC_OK);
+ {
+ // Enable all the layers initially. Encoder doesn't support producing
+ // frames when no layers are enabled.
+ LibvpxVp9Encoder::RateControlParameters parameters;
+ parameters.framerate_fps = 30.0;
+ for (int sid = 0; sid < codec.VP9()->numberOfSpatialLayers; ++sid) {
+ for (int tid = 0; tid < codec.VP9()->numberOfTemporalLayers; ++tid) {
+ parameters.bitrate.SetBitrate(sid, tid, 100'000);
+ }
+ }
+ encoder.SetRates(parameters);
+ }
+
+ std::vector<VideoFrameType> frame_types(1);
+ VideoFrame fake_image = VideoFrame::Builder()
+ .set_video_frame_buffer(I420Buffer::Create(
+ int{codec.width}, int{codec.height}))
+ .build();
+
+ // Start producing frames at random.
+ while (helper.CanReadBytes(1)) {
+ uint8_t action = helper.Read<uint8_t>();
+ switch (action & 0b11) {
+ case kEncode: {
+ // bitmask of the action: SSSS-K00, where
+ // four S bit indicate which spatial layers should be produced,
+ // K bit indicates if frame should be a key frame.
+ frame_types[0] = (action & 0b100) ? VideoFrameType::kVideoFrameKey
+ : VideoFrameType::kVideoFrameDelta;
+ encoder.Encode(fake_image, &frame_types);
+ uint8_t encode_spatial_layers = (action >> 4);
+ for (size_t sid = 0; sid < state.config.ss_number_layers; ++sid) {
+ bool drop = true;
+ switch (state.frame_drop.framedrop_mode) {
+ case FULL_SUPERFRAME_DROP:
+ drop = encode_spatial_layers == 0;
+ break;
+ case LAYER_DROP:
+ drop = (encode_spatial_layers & (1 << sid)) == 0;
+ break;
+ case CONSTRAINED_LAYER_DROP:
+ drop = DropBelow(encode_spatial_layers, sid,
+ state.config.ss_number_layers);
+ break;
+ case CONSTRAINED_FROM_ABOVE_DROP:
+ drop = DropAbove(encode_spatial_layers, sid);
+ break;
+ }
+ if (!drop) {
+ state.layer_id.spatial_layer_id = sid;
+ state.callback.output_cx_pkt(&state.pkt, state.callback.user_priv);
+ }
+ }
+ } break;
+ case kSetRates: {
+ // bitmask of the action: (S3)(S1)(S0)01,
+ // where Sx is number of temporal layers to enable for spatial layer x
+ // In pariculat Sx = 0 indicates spatial layer x should be disabled.
+ LibvpxVp9Encoder::RateControlParameters parameters;
+ parameters.framerate_fps = 30.0;
+ for (int sid = 0; sid < codec.VP9()->numberOfSpatialLayers; ++sid) {
+ int temporal_layers = (action >> ((1 + sid) * 2)) & 0b11;
+ for (int tid = 0; tid < temporal_layers; ++tid) {
+ parameters.bitrate.SetBitrate(sid, tid, 100'000);
+ }
+ }
+ // Ignore allocation that turns off all the layers. in such case
+ // it is up to upper-layer code not to call Encode.
+ if (parameters.bitrate.get_sum_bps() > 0) {
+ encoder.SetRates(parameters);
+ }
+ } break;
+ default:
+ // Unspecificed values are noop.
+ break;
+ }
+ }
+}
+} // namespace webrtc
