Integration of VP9 packetization.

webrtc/modules/video_coding/codecs/vp9/vp9_impl.cc

 /*
  *  Copyright (c) 2014 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.
  *
  */
@@ skipping 39 matching lines @@
   if (width * height <= 352 * 288)
     return 5;
   else
     return 7;
 }
 
 VP9Encoder* VP9Encoder::Create() {
   return new VP9EncoderImpl();
 }
 
+void VP9EncoderImpl::EncoderOutputCodedPacketCallback(vpx_codec_cx_pkt* pkt,
+                                                      void* user_data) {
+  VP9EncoderImpl* enc = (VP9EncoderImpl*)(user_data);
+  enc->GetEncodedLayerFrame(pkt);
+}
+
 VP9EncoderImpl::VP9EncoderImpl()
     : encoded_image_(),
       encoded_complete_callback_(NULL),
       inited_(false),
       timestamp_(0),
       picture_id_(0),
       cpu_speed_(3),
       rc_max_intra_target_(0),
       encoder_(NULL),
       config_(NULL),
-      raw_(NULL) {
+      raw_(NULL),
+      input_image_(NULL),
+      tl0_pic_idx_(0),
+      gof_idx_(0),
+      num_temporal_layers_(0),
+      num_spatial_layers_(0) {
   memset(&codec_, 0, sizeof(codec_));
   uint32_t seed = static_cast<uint32_t>(TickTime::MillisecondTimestamp());
   srand(seed);
 }
 
 VP9EncoderImpl::~VP9EncoderImpl() {
   Release();
 }
 
 int VP9EncoderImpl::Release() {
@@ skipping 13 matching lines @@
     config_ = NULL;
   }
   if (raw_ != NULL) {
     vpx_img_free(raw_);
     raw_ = NULL;
   }
   inited_ = false;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
+bool VP9EncoderImpl::SetSvcRates() {
+  float rate_ratio[VPX_MAX_LAYERS] = {0};
+  float total = 0;
+  uint8_t i = 0;
+
+  for (i = 0; i < num_spatial_layers_; ++i) {
+    if (svc_internal_.svc_params.scaling_factor_num[i] <= 0 ||
+        svc_internal_.svc_params.scaling_factor_den[i] <= 0) {
+      return false;
+    }
+    rate_ratio[i] = static_cast<float>(
+        svc_internal_.svc_params.scaling_factor_num[i]) /
+        svc_internal_.svc_params.scaling_factor_den[i];
+    total += rate_ratio[i];
+  }
+
+  for (i = 0; i < num_spatial_layers_; ++i) {
+    config_->ss_target_bitrate[i] = static_cast<unsigned int>(
+        config_->rc_target_bitrate * rate_ratio[i] / total);
+    if (num_temporal_layers_ == 1) {
+      config_->layer_target_bitrate[i] = config_->ss_target_bitrate[i];
+    } else if (num_temporal_layers_ == 2) {
+      config_->layer_target_bitrate[i * num_temporal_layers_] =
+          config_->ss_target_bitrate[i] * 2 / 3;
+      config_->layer_target_bitrate[i * num_temporal_layers_ + 1] =
+          config_->ss_target_bitrate[i];
+    } else if (num_temporal_layers_ == 3) {
+      config_->layer_target_bitrate[i * num_temporal_layers_] =
+          config_->ss_target_bitrate[i] / 2;
+      config_->layer_target_bitrate[i * num_temporal_layers_ + 1] =
+          config_->layer_target_bitrate[i * num_temporal_layers_] +
+          (config_->ss_target_bitrate[i] / 4);
+      config_->layer_target_bitrate[i * num_temporal_layers_ + 2] =
+          config_->ss_target_bitrate[i];
+    } else {
+      return false;
+    }
+  }
+
+  // For now, temporal layers only supported when having one spatial layer.
+  if (num_spatial_layers_ == 1) {
+    for (i = 0; i < num_temporal_layers_; ++i) {
+      config_->ts_target_bitrate[i] = config_->layer_target_bitrate[i];
+    }
+  }
+
+  return true;
+}
+
 int VP9EncoderImpl::SetRates(uint32_t new_bitrate_kbit,
                              uint32_t new_framerate) {
   if (!inited_) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
   if (encoder_->err) {
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   if (new_framerate < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   // Update bit rate
   if (codec_.maxBitrate > 0 && new_bitrate_kbit > codec_.maxBitrate) {
     new_bitrate_kbit = codec_.maxBitrate;
   }
   config_->rc_target_bitrate = new_bitrate_kbit;
   codec_.maxFramerate = new_framerate;
+
+  if (!SetSvcRates()) {
+    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
+  }
+
   // Update encoder context
   if (vpx_codec_enc_config_set(encoder_, config_)) {
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int VP9EncoderImpl::InitEncode(const VideoCodec* inst,
                                int number_of_cores,
                                size_t /*max_payload_size*/) {
   if (inst == NULL) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (inst->maxFramerate < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   // Allow zero to represent an unspecified maxBitRate
   if (inst->maxBitrate > 0 && inst->startBitrate > inst->maxBitrate) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (inst->width < 1 || inst->height < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
   if (number_of_cores < 1) {
     return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
   }
+  if (inst->codecSpecific.VP9.numberOfTemporalLayers < 1 ||

[holmer, 2015/07/31 09:05:26]

Should 0 be allowed as "no temporal layers"?

[åsapersson, 2015/07/31 10:09:37]

See change.

+      inst->codecSpecific.VP9.numberOfTemporalLayers > 3) {
+    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
+  }
+  // For now, only support one spatial layer.
+  if (inst->codecSpecific.VP9.numberOfSpatialLayers != 1) {
+    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
+  }
   int retVal = Release();
   if (retVal < 0) {
     return retVal;
   }
   if (encoder_ == NULL) {
     encoder_ = new vpx_codec_ctx_t;
   }
   if (config_ == NULL) {
     config_ = new vpx_codec_enc_cfg_t;
   }
   timestamp_ = 0;
   if (&codec_ != inst) {
     codec_ = *inst;
   }
+
+  num_temporal_layers_ = inst->codecSpecific.VP9.numberOfTemporalLayers;
+  num_spatial_layers_ = inst->codecSpecific.VP9.numberOfSpatialLayers;
+
   // Random start 16 bits is enough.
   picture_id_ = static_cast<uint16_t>(rand()) & 0x7FFF;
   // Allocate memory for encoded image
   if (encoded_image_._buffer != NULL) {
     delete [] encoded_image_._buffer;
   }
   encoded_image_._size = CalcBufferSize(kI420, codec_.width, codec_.height);
   encoded_image_._buffer = new uint8_t[encoded_image_._size];
   encoded_image_._completeFrame = true;
   // Creating a wrapper to the image - setting image data to NULL. Actual
@@ skipping 31 matching lines @@
   if (inst->codecSpecific.VP9.keyFrameInterval  > 0) {
     config_->kf_mode = VPX_KF_AUTO;
     config_->kf_max_dist = inst->codecSpecific.VP9.keyFrameInterval;
   } else {
     config_->kf_mode = VPX_KF_DISABLED;
   }
   // Determine number of threads based on the image size and #cores.
   config_->g_threads = NumberOfThreads(config_->g_w,
                                        config_->g_h,
                                        number_of_cores);
+
   cpu_speed_ = GetCpuSpeed(config_->g_w, config_->g_h);
+
+  // TODO(asapersson): Check configuration of temporal switch up and increase
+  // pattern length.
+  if (num_temporal_layers_ == 1) {
+    gof_.SetGofInfoVP9(kTemporalStructureMode1);
+    config_->temporal_layering_mode = VP9E_TEMPORAL_LAYERING_MODE_NOLAYERING;
+    config_->ts_number_layers = 1;
+    config_->ts_rate_decimator[0] = 1;
+    config_->ts_periodicity = 1;
+    config_->ts_layer_id[0] = 0;
+  } else if (num_temporal_layers_ == 2) {
+    gof_.SetGofInfoVP9(kTemporalStructureMode2);
+    config_->temporal_layering_mode = VP9E_TEMPORAL_LAYERING_MODE_0101;
+    config_->ts_number_layers = 2;
+    config_->ts_rate_decimator[0] = 2;
+    config_->ts_rate_decimator[1] = 1;
+    config_->ts_periodicity = 2;
+    config_->ts_layer_id[0] = 0;
+    config_->ts_layer_id[1] = 1;
+  } else if (num_temporal_layers_ == 3) {
+    gof_.SetGofInfoVP9(kTemporalStructureMode3);
+    config_->temporal_layering_mode = VP9E_TEMPORAL_LAYERING_MODE_0212;
+    config_->ts_number_layers = 3;
+    config_->ts_rate_decimator[0] = 4;
+    config_->ts_rate_decimator[1] = 2;
+    config_->ts_rate_decimator[2] = 1;
+    config_->ts_periodicity = 4;
+    config_->ts_layer_id[0] = 0;
+    config_->ts_layer_id[1] = 2;
+    config_->ts_layer_id[2] = 1;
+    config_->ts_layer_id[3] = 2;
+  } else {
+    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
+  }
+
+  tl0_pic_idx_ = static_cast<uint8_t>(rand());
+
   return InitAndSetControlSettings(inst);
 }
 
 int VP9EncoderImpl::NumberOfThreads(int width,
                                     int height,
                                     int number_of_cores) {
+  // For the current libvpx library, only 1 thread is supported when SVC is
+  // turned on.
+  if (num_temporal_layers_ > 1 || num_spatial_layers_ > 1) {
+    return 1;
+  }
+
   // Keep the number of encoder threads equal to the possible number of column
   // tiles, which is (1, 2, 4, 8). See comments below for VP9E_SET_TILE_COLUMNS.
   if (width * height >= 1280 * 720 && number_of_cores > 4) {
     return 4;
   } else if (width * height >= 640 * 480 && number_of_cores > 2) {
     return 2;
   } else {
     // 1 thread less than VGA.
     return 1;
   }
 }
 
 int VP9EncoderImpl::InitAndSetControlSettings(const VideoCodec* inst) {
+
+  config_->ss_number_layers = num_spatial_layers_;
+
+  if (num_spatial_layers_ > 1) {
+    config_->rc_min_quantizer = 0;
+    config_->rc_max_quantizer = 63;
+  }
+  int scaling_factor_num = 256;
+  for (int i = num_spatial_layers_ - 1; i >= 0; --i) {
+    svc_internal_.svc_params.max_quantizers[i] = config_->rc_max_quantizer;
+    svc_internal_.svc_params.min_quantizers[i] = config_->rc_min_quantizer;
+    // 1:2 scaling in each dimension.
+    svc_internal_.svc_params.scaling_factor_num[i] = scaling_factor_num;
+    svc_internal_.svc_params.scaling_factor_den[i] = 256;
+    scaling_factor_num /= 2;
+  }
+
+  if (!SetSvcRates()) {
+    return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
+  }
+
   if (vpx_codec_enc_init(encoder_, vpx_codec_vp9_cx(), config_, 0)) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
   vpx_codec_control(encoder_, VP8E_SET_CPUUSED, cpu_speed_);
   vpx_codec_control(encoder_, VP8E_SET_MAX_INTRA_BITRATE_PCT,
                     rc_max_intra_target_);
   vpx_codec_control(encoder_, VP9E_SET_AQ_MODE,
                     inst->codecSpecific.VP9.adaptiveQpMode ? 3 : 0);
+
+  vpx_codec_control(
+      encoder_, VP9E_SET_SVC,
+      (num_temporal_layers_ > 1 || num_spatial_layers_ > 1) ? 1 : 0);
+  if (num_temporal_layers_ > 1 || num_spatial_layers_ > 1) {
+    vpx_codec_control(encoder_, VP9E_SET_SVC_PARAMETERS,
+                      &svc_internal_.svc_params);
+  }
+  // Register callback for getting each spatial layer.
+  vpx_codec_priv_output_cx_pkt_cb_pair_t cbp = {
+      VP9EncoderImpl::EncoderOutputCodedPacketCallback, (void*)(this)};
+  vpx_codec_control(encoder_, VP9E_REGISTER_CX_CALLBACK, (void*)(&cbp));
+
   // Control function to set the number of column tiles in encoding a frame, in
   // log2 unit: e.g., 0 = 1 tile column, 1 = 2 tile columns, 2 = 4 tile columns.
   // The number tile columns will be capped by the encoder based on image size
   // (minimum width of tile column is 256 pixels, maximum is 4096).
   vpx_codec_control(encoder_, VP9E_SET_TILE_COLUMNS, (config_->g_threads >> 1));
 #if !defined(WEBRTC_ARCH_ARM) && !defined(WEBRTC_ARCH_ARM64)
   // Note denoiser is still off by default until further testing/optimization,
   // i.e., codecSpecific.VP9.denoisingOn == 0.
   vpx_codec_control(encoder_, VP9E_SET_NOISE_SENSITIVITY,
                     inst->codecSpecific.VP9.denoisingOn ? 1 : 0);
@@ skipping 29 matching lines @@
   if (encoded_complete_callback_ == NULL) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
   VideoFrameType frame_type = kDeltaFrame;
   // We only support one stream at the moment.
   if (frame_types && frame_types->size() > 0) {
     frame_type = (*frame_types)[0];
   }
   DCHECK_EQ(input_image.width(), static_cast<int>(raw_->d_w));
   DCHECK_EQ(input_image.height(), static_cast<int>(raw_->d_h));
+
+  // Set input image for use in the callback.
+  // This was necessary since you need some information from input_image.
+  // You can save only the necessary information (such as timestamp) instead of
+  // doing this.
+  input_image_ = &input_image;
+
   // Image in vpx_image_t format.
   // Input image is const. VPX's raw image is not defined as const.
   raw_->planes[VPX_PLANE_Y] = const_cast<uint8_t*>(input_image.buffer(kYPlane));
   raw_->planes[VPX_PLANE_U] = const_cast<uint8_t*>(input_image.buffer(kUPlane));
   raw_->planes[VPX_PLANE_V] = const_cast<uint8_t*>(input_image.buffer(kVPlane));
   raw_->stride[VPX_PLANE_Y] = input_image.stride(kYPlane);
   raw_->stride[VPX_PLANE_U] = input_image.stride(kUPlane);
   raw_->stride[VPX_PLANE_V] = input_image.stride(kVPlane);
 
   int flags = 0;
   bool send_keyframe = (frame_type == kKeyFrame);
   if (send_keyframe) {
     // Key frame request from caller.
     flags = VPX_EFLAG_FORCE_KF;
   }
   assert(codec_.maxFramerate > 0);
   uint32_t duration = 90000 / codec_.maxFramerate;
   if (vpx_codec_encode(encoder_, raw_, timestamp_, duration, flags,
                        VPX_DL_REALTIME)) {
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   timestamp_ += duration;
-  return GetEncodedPartitions(input_image);
+
+  return WEBRTC_VIDEO_CODEC_OK;
 }
 
 void VP9EncoderImpl::PopulateCodecSpecific(CodecSpecificInfo* codec_specific,
                                        const vpx_codec_cx_pkt& pkt,
                                        uint32_t timestamp) {
   assert(codec_specific != NULL);
   codec_specific->codecType = kVideoCodecVP9;
   CodecSpecificInfoVP9 *vp9_info = &(codec_specific->codecSpecific.VP9);
-  vp9_info->pictureId = picture_id_;
-  vp9_info->keyIdx = kNoKeyIdx;
-  vp9_info->nonReference = (pkt.data.frame.flags & VPX_FRAME_IS_DROPPABLE) != 0;
-  // TODO(marpan): Temporal layers are supported in the current VP9 version,
-  // but for now use 1 temporal layer encoding. Will update this when temporal
-  // layer support for VP9 is added in webrtc.
-  vp9_info->temporalIdx = kNoTemporalIdx;
-  vp9_info->layerSync = false;
-  vp9_info->tl0PicIdx = kNoTl0PicIdx;
-  picture_id_ = (picture_id_ + 1) & 0x7FFF;
+  // TODO(asapersson): Set correct values.
+  vp9_info->inter_pic_predicted =
+      (pkt.data.frame.flags & VPX_FRAME_IS_KEY) ? false : true;
+  vp9_info->flexible_mode = codec_.codecSpecific.VP9.flexibleMode;
+  vp9_info->ss_data_available =
+      (pkt.data.frame.flags & VPX_FRAME_IS_KEY) ? true : false;
+  if (pkt.data.frame.flags & VPX_FRAME_IS_KEY) {
+    gof_idx_ = 0;
+  }
+
+  vpx_svc_layer_id_t layer_id = {0};
+  vpx_codec_control(encoder_, VP9E_GET_SVC_LAYER_ID, &layer_id);
+
+  assert(num_temporal_layers_ > 0);
+  assert(num_spatial_layers_ > 0);
+  if (num_temporal_layers_ == 1) {
+    assert(layer_id.temporal_layer_id == 0);
+    vp9_info->temporal_idx = kNoTemporalIdx;
+  } else {
+    vp9_info->temporal_idx = layer_id.temporal_layer_id;
+  }
+  if (num_spatial_layers_ == 1) {
+    assert(layer_id.spatial_layer_id == 0);
+    vp9_info->spatial_idx = kNoSpatialIdx;
+  } else {
+    vp9_info->spatial_idx = layer_id.spatial_layer_id;
+  }
+  if (layer_id.spatial_layer_id != 0) {
+    vp9_info->ss_data_available = false;
+  }
+
+  if (vp9_info->flexible_mode) {
+    vp9_info->gof_idx = kNoGofIdx;
+  } else {
+    vp9_info->gof_idx =
+        static_cast<uint8_t>(gof_idx_++ % gof_.num_frames_in_gof);
+  }
+
+  // TODO(asapersson): this info has to be obtained from the encoder.
+  vp9_info->temporal_up_switch = true;
+
+  if (layer_id.spatial_layer_id == 0) {
+    picture_id_ = (picture_id_ + 1) & 0x7FFF;
+    // TODO(asapersson): this info has to be obtained from the encoder.
+    vp9_info->inter_layer_predicted = false;
+  } else {
+    // TODO(asapersson): this info has to be obtained from the encoder.
+    vp9_info->inter_layer_predicted = true;
+  }
+
+  vp9_info->picture_id = picture_id_;
+
+  if (!vp9_info->flexible_mode) {
+    if (layer_id.temporal_layer_id == 0 && layer_id.spatial_layer_id == 0) {
+      tl0_pic_idx_++;
+    }
+    vp9_info->tl0_pic_idx = tl0_pic_idx_;
+  }
+
+  if (vp9_info->ss_data_available) {
+    vp9_info->num_spatial_layers = num_spatial_layers_;
+    vp9_info->spatial_layer_resolution_present = true;
+    for (size_t i = 0; i < vp9_info->num_spatial_layers; ++i) {
+      vp9_info->width[i] = codec_.width *
+                           svc_internal_.svc_params.scaling_factor_num[i] /
+                           svc_internal_.svc_params.scaling_factor_den[i];
+      vp9_info->height[i] = codec_.height *
+                            svc_internal_.svc_params.scaling_factor_num[i] /
+                            svc_internal_.svc_params.scaling_factor_den[i];
+    }
+    if (!vp9_info->flexible_mode) {
+      vp9_info->gof.CopyGofInfoVP9(gof_);
+    }
+  }
 }
 
-int VP9EncoderImpl::GetEncodedPartitions(const VideoFrame& input_image) {
-  vpx_codec_iter_t iter = NULL;
+int VP9EncoderImpl::GetEncodedLayerFrame(const vpx_codec_cx_pkt* pkt) {
   encoded_image_._length = 0;
   encoded_image_._frameType = kDeltaFrame;
   RTPFragmentationHeader frag_info;
   // Note: no data partitioning in VP9, so 1 partition only. We keep this
   // fragmentation data for now, until VP9 packetizer is implemented.
   frag_info.VerifyAndAllocateFragmentationHeader(1);
   int part_idx = 0;
   CodecSpecificInfo codec_specific;
-  const vpx_codec_cx_pkt_t *pkt = NULL;
-  while ((pkt = vpx_codec_get_cx_data(encoder_, &iter)) != NULL) {
-    switch (pkt->kind) {
-      case VPX_CODEC_CX_FRAME_PKT: {
-        memcpy(&encoded_image_._buffer[encoded_image_._length],
-               pkt->data.frame.buf,
-               pkt->data.frame.sz);
-        frag_info.fragmentationOffset[part_idx] = encoded_image_._length;
-        frag_info.fragmentationLength[part_idx] =
-            static_cast<uint32_t>(pkt->data.frame.sz);
-        frag_info.fragmentationPlType[part_idx] = 0;
-        frag_info.fragmentationTimeDiff[part_idx] = 0;
-        encoded_image_._length += static_cast<uint32_t>(pkt->data.frame.sz);
-        assert(encoded_image_._length <= encoded_image_._size);
-        break;
-      }
-      default: {
-        break;
-      }
-    }
-    // End of frame.
-    if ((pkt->data.frame.flags & VPX_FRAME_IS_FRAGMENT) == 0) {
-      // Check if encoded frame is a key frame.
-      if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
-        encoded_image_._frameType = kKeyFrame;
-      }
-      PopulateCodecSpecific(&codec_specific, *pkt, input_image.timestamp());
-      break;
-    }
+
+  assert(pkt->kind == VPX_CODEC_CX_FRAME_PKT);
+  memcpy(&encoded_image_._buffer[encoded_image_._length], pkt->data.frame.buf,
+         pkt->data.frame.sz);
+  frag_info.fragmentationOffset[part_idx] = encoded_image_._length;
+  frag_info.fragmentationLength[part_idx] =
+      static_cast<uint32_t>(pkt->data.frame.sz);
+  frag_info.fragmentationPlType[part_idx] = 0;
+  frag_info.fragmentationTimeDiff[part_idx] = 0;
+  encoded_image_._length += static_cast<uint32_t>(pkt->data.frame.sz);
+  assert(encoded_image_._length <= encoded_image_._size);
+
+  // End of frame.
+  // Check if encoded frame is a key frame.
+  if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
+    encoded_image_._frameType = kKeyFrame;
   }
+  PopulateCodecSpecific(&codec_specific, *pkt, input_image_->timestamp());
+
   if (encoded_image_._length > 0) {
     TRACE_COUNTER1("webrtc", "EncodedFrameSize", encoded_image_._length);
-    encoded_image_._timeStamp = input_image.timestamp();
-    encoded_image_.capture_time_ms_ = input_image.render_time_ms();
+    encoded_image_._timeStamp = input_image_->timestamp();
+    encoded_image_.capture_time_ms_ = input_image_->render_time_ms();
     encoded_image_._encodedHeight = raw_->d_h;
     encoded_image_._encodedWidth = raw_->d_w;
     encoded_complete_callback_->Encoded(encoded_image_, &codec_specific,
-                                      &frag_info);
+                                        &frag_info);
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int VP9EncoderImpl::SetChannelParameters(uint32_t packet_loss, int64_t rtt) {
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int VP9EncoderImpl::RegisterEncodeCompleteCallback(
     EncodedImageCallback* callback) {
@@ skipping 169 matching lines @@
     decoder_ = NULL;
   }
   // Releases buffers from the pool. Any buffers not in use are deleted. Buffers
   // still referenced externally are deleted once fully released, not returning
   // to the pool.
   frame_buffer_pool_.ClearPool();
   inited_ = false;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 }  // namespace webrtc