Reland "Prepare MediaCodecVideoEncoder for surface textures.""

talk/app/webrtc/java/jni/androidmediaencoder_jni.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 15 matching lines @@
  *
  */
 
 #include "talk/app/webrtc/java/jni/androidmediaencoder_jni.h"
 #include "talk/app/webrtc/java/jni/classreferenceholder.h"
 #include "talk/app/webrtc/java/jni/androidmediacodeccommon.h"
 #include "webrtc/base/bind.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/thread.h"
+#include "webrtc/base/thread_checker.h"
 #include "webrtc/modules/rtp_rtcp/source/h264_bitstream_parser.h"
 #include "webrtc/modules/video_coding/codecs/interface/video_codec_interface.h"
 #include "webrtc/modules/video_coding/utility/include/quality_scaler.h"
 #include "webrtc/modules/video_coding/utility/include/vp8_header_parser.h"
 #include "webrtc/system_wrappers/interface/field_trial.h"
 #include "webrtc/system_wrappers/interface/logcat_trace_context.h"
 #include "third_party/libyuv/include/libyuv/convert.h"
 #include "third_party/libyuv/include/libyuv/convert_from.h"
 #include "third_party/libyuv/include/libyuv/video_common.h"
 
@@ skipping 26 matching lines @@
 // MediaCodecVideoEncoder is a webrtc::VideoEncoder implementation that uses
 // Android's MediaCodec SDK API behind the scenes to implement (hopefully)
 // HW-backed video encode.  This C++ class is implemented as a very thin shim,
 // delegating all of the interesting work to org.webrtc.MediaCodecVideoEncoder.
 // MediaCodecVideoEncoder is created, operated, and destroyed on a single
 // thread, currently the libjingle Worker thread.
 class MediaCodecVideoEncoder : public webrtc::VideoEncoder,
                                public rtc::MessageHandler {
  public:
   virtual ~MediaCodecVideoEncoder();
-  explicit MediaCodecVideoEncoder(JNIEnv* jni, VideoCodecType codecType);
+  MediaCodecVideoEncoder(JNIEnv* jni,
+                         VideoCodecType codecType);
 
   // webrtc::VideoEncoder implementation.  Everything trampolines to
   // |codec_thread_| for execution.
   int32_t InitEncode(const webrtc::VideoCodec* codec_settings,
                      int32_t /* number_of_cores */,
                      size_t /* max_payload_size */) override;
   int32_t Encode(const webrtc::VideoFrame& input_image,
                  const webrtc::CodecSpecificInfo* /* codec_specific_info */,
                  const std::vector<webrtc::FrameType>* frame_types) override;
   int32_t RegisterEncodeCompleteCallback(
       webrtc::EncodedImageCallback* callback) override;
   int32_t Release() override;
   int32_t SetChannelParameters(uint32_t /* packet_loss */,
                                int64_t /* rtt */) override;
   int32_t SetRates(uint32_t new_bit_rate, uint32_t frame_rate) override;
 
   // rtc::MessageHandler implementation.
   void OnMessage(rtc::Message* msg) override;
 
   void OnDroppedFrame() override;
 
   int GetTargetFramerate() override;
 
  private:
-  // CHECK-fail if not running on |codec_thread_|.
-  void CheckOnCodecThread();
-
-  // Release() and InitEncode() in an attempt to restore the codec to an
+  // ResetCodecOnCodecThread() calls ReleaseOnCodecThread() and
+  // InitEncodeOnCodecThread() in an attempt to restore the codec to an
   // operable state.  Necessary after all manner of OMX-layer errors.
-  void ResetCodec();
+  bool ResetCodecOnCodecThread();
 
   // Implementation of webrtc::VideoEncoder methods above, all running on the
   // codec thread exclusively.
   //
   // If width==0 then this is assumed to be a re-initialization and the
   // previously-current values are reused instead of the passed parameters
   // (makes it easier to reason about thread-safety).
   int32_t InitEncodeOnCodecThread(int width, int height, int kbps, int fps);
+  // Reconfigure to match |frame| in width, height. Returns false if
+  // reconfiguring fails.
+  bool MaybeReconfigureEncoderOnCodecThread(const webrtc::VideoFrame& frame);
   int32_t EncodeOnCodecThread(
       const webrtc::VideoFrame& input_image,
       const std::vector<webrtc::FrameType>* frame_types);
+  bool EncodeByteBufferOnCodecThread(JNIEnv* jni,
+      bool key_frame, const webrtc::VideoFrame& frame, int input_buffer_index);
+
   int32_t RegisterEncodeCompleteCallbackOnCodecThread(
       webrtc::EncodedImageCallback* callback);
   int32_t ReleaseOnCodecThread();
   int32_t SetRatesOnCodecThread(uint32_t new_bit_rate, uint32_t frame_rate);
 
   // Helper accessors for MediaCodecVideoEncoder$OutputBufferInfo members.
   int GetOutputBufferInfoIndex(JNIEnv* jni, jobject j_output_buffer_info);
   jobject GetOutputBufferInfoBuffer(JNIEnv* jni, jobject j_output_buffer_info);
   bool GetOutputBufferInfoIsKeyFrame(JNIEnv* jni, jobject j_output_buffer_info);
   jlong GetOutputBufferInfoPresentationTimestampUs(
       JNIEnv* jni, jobject j_output_buffer_info);
 
   // Deliver any outputs pending in the MediaCodec to our |callback_| and return
   // true on success.
   bool DeliverPendingOutputs(JNIEnv* jni);
 
   // Search for H.264 start codes.
   int32_t NextNaluPosition(uint8_t *buffer, size_t buffer_size);
 
   // Type of video codec.
   VideoCodecType codecType_;
 
   // Valid all the time since RegisterEncodeCompleteCallback() Invoke()s to
   // |codec_thread_| synchronously.
   webrtc::EncodedImageCallback* callback_;
 
   // State that is constant for the lifetime of this object once the ctor
   // returns.
   scoped_ptr<Thread> codec_thread_;  // Thread on which to operate MediaCodec.
+  rtc::ThreadChecker codec_thread_checker_;
   ScopedGlobalRef<jclass> j_media_codec_video_encoder_class_;
   ScopedGlobalRef<jobject> j_media_codec_video_encoder_;
   jmethodID j_init_encode_method_;
+  jmethodID j_get_input_buffers_method_;
   jmethodID j_dequeue_input_buffer_method_;
-  jmethodID j_encode_method_;
+  jmethodID j_encode_buffer_method_;
   jmethodID j_release_method_;
   jmethodID j_set_rates_method_;
   jmethodID j_dequeue_output_buffer_method_;
   jmethodID j_release_output_buffer_method_;
   jfieldID j_color_format_field_;
   jfieldID j_info_index_field_;
   jfieldID j_info_buffer_field_;
   jfieldID j_info_is_key_frame_field_;
   jfieldID j_info_presentation_timestamp_us_field_;
 
@@ skipping 64 matching lines @@
   ScopedLocalRefFrame local_ref_frame(jni);
   // It would be nice to avoid spinning up a new thread per MediaCodec, and
   // instead re-use e.g. the PeerConnectionFactory's |worker_thread_|, but bug
   // 2732 means that deadlocks abound.  This class synchronously trampolines
   // to |codec_thread_|, so if anything else can be coming to _us_ from
   // |codec_thread_|, or from any thread holding the |_sendCritSect| described
   // in the bug, we have a problem.  For now work around that with a dedicated
   // thread.
   codec_thread_->SetName("MediaCodecVideoEncoder", NULL);
   RTC_CHECK(codec_thread_->Start()) << "Failed to start MediaCodecVideoEncoder";
-
+  codec_thread_checker_.DetachFromThread();
   jclass j_output_buffer_info_class =
       FindClass(jni, "org/webrtc/MediaCodecVideoEncoder$OutputBufferInfo");
   j_init_encode_method_ = GetMethodID(
       jni,
       *j_media_codec_video_encoder_class_,
       "initEncode",
-      "(Lorg/webrtc/MediaCodecVideoEncoder$VideoCodecType;IIII)"
-      "[Ljava/nio/ByteBuffer;");
+      "(Lorg/webrtc/MediaCodecVideoEncoder$VideoCodecType;IIII)Z");
+  j_get_input_buffers_method_ = GetMethodID(
+      jni,
+      *j_media_codec_video_encoder_class_,
+      "getInputBuffers",
+      "()[Ljava/nio/ByteBuffer;");
   j_dequeue_input_buffer_method_ = GetMethodID(
       jni, *j_media_codec_video_encoder_class_, "dequeueInputBuffer", "()I");
-  j_encode_method_ = GetMethodID(
-      jni, *j_media_codec_video_encoder_class_, "encode", "(ZIIJ)Z");
+  j_encode_buffer_method_ = GetMethodID(
+      jni, *j_media_codec_video_encoder_class_, "encodeBuffer", "(ZIIJ)Z");
   j_release_method_ =
       GetMethodID(jni, *j_media_codec_video_encoder_class_, "release", "()V");
   j_set_rates_method_ = GetMethodID(
       jni, *j_media_codec_video_encoder_class_, "setRates", "(II)Z");
   j_dequeue_output_buffer_method_ = GetMethodID(
       jni,
       *j_media_codec_video_encoder_class_,
       "dequeueOutputBuffer",
       "()Lorg/webrtc/MediaCodecVideoEncoder$OutputBufferInfo;");
   j_release_output_buffer_method_ = GetMethodID(
@@ skipping 102 matching lines @@
     quality_scaler_.ReportFramerate(frame_rate);
 
   return codec_thread_->Invoke<int32_t>(
       Bind(&MediaCodecVideoEncoder::SetRatesOnCodecThread,
            this,
            new_bit_rate,
            frame_rate));
 }
 
 void MediaCodecVideoEncoder::OnMessage(rtc::Message* msg) {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
 
   // We only ever send one message to |this| directly (not through a Bind()'d
   // functor), so expect no ID/data.
   RTC_CHECK(!msg->message_id) << "Unexpected message!";
   RTC_CHECK(!msg->pdata) << "Unexpected message!";
-  CheckOnCodecThread();
   if (!inited_) {
     return;
   }
 
   // It would be nice to recover from a failure here if one happened, but it's
   // unclear how to signal such a failure to the app, so instead we stay silent
   // about it and let the next app-called API method reveal the borkedness.
   DeliverPendingOutputs(jni);
   codec_thread_->PostDelayed(kMediaCodecPollMs, this);
 }
 
-void MediaCodecVideoEncoder::CheckOnCodecThread() {
-  RTC_CHECK(codec_thread_ == ThreadManager::Instance()->CurrentThread())
-      << "Running on wrong thread!";
-}
-
-void MediaCodecVideoEncoder::ResetCodec() {
-  ALOGE << "ResetCodec";
-  if (Release() != WEBRTC_VIDEO_CODEC_OK ||
-      codec_thread_->Invoke<int32_t>(Bind(
-          &MediaCodecVideoEncoder::InitEncodeOnCodecThread, this,
-          width_, height_, 0, 0)) != WEBRTC_VIDEO_CODEC_OK) {
+bool MediaCodecVideoEncoder::ResetCodecOnCodecThread() {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
+  ALOGE << "ResetOnCodecThread";
+  if (ReleaseOnCodecThread() != WEBRTC_VIDEO_CODEC_OK ||
+      InitEncodeOnCodecThread(width_, height_, 0, 0)
+          != WEBRTC_VIDEO_CODEC_OK) {
     // TODO(fischman): wouldn't it be nice if there was a way to gracefully
     // degrade to a SW encoder at this point?  There isn't one AFAICT :(
     // https://code.google.com/p/webrtc/issues/detail?id=2920
+    return false;
   }
+  return true;
 }
 
 int32_t MediaCodecVideoEncoder::InitEncodeOnCodecThread(
     int width, int height, int kbps, int fps) {
-  CheckOnCodecThread();
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
 
   ALOGD << "InitEncodeOnCodecThread Type: " <<  (int)codecType_ << ", " <<
       width << " x " << height << ". Bitrate: " << kbps <<
       " kbps. Fps: " << fps;
   if (kbps == 0) {
     kbps = last_set_bitrate_kbps_;
   }
   if (fps == 0) {
@@ skipping 16 matching lines @@
   current_encoding_time_ms_ = 0;
   last_input_timestamp_ms_ = -1;
   last_output_timestamp_ms_ = -1;
   output_timestamp_ = 0;
   output_render_time_ms_ = 0;
   timestamps_.clear();
   render_times_ms_.clear();
   frame_rtc_times_ms_.clear();
   drop_next_input_frame_ = false;
   picture_id_ = static_cast<uint16_t>(rand()) & 0x7FFF;
+
   // We enforce no extra stride/padding in the format creation step.
   jobject j_video_codec_enum = JavaEnumFromIndex(
       jni, "MediaCodecVideoEncoder$VideoCodecType", codecType_);
+  const bool encode_status = jni->CallBooleanMethod(
+      *j_media_codec_video_encoder_, j_init_encode_method_,
+      j_video_codec_enum, width, height, kbps, fps);
+  if (!encode_status) {
+    ALOGE << "Failed to configure encoder.";
+    return WEBRTC_VIDEO_CODEC_ERROR;
+  }
+  CHECK_EXCEPTION(jni);
+
   jobjectArray input_buffers = reinterpret_cast<jobjectArray>(
       jni->CallObjectMethod(*j_media_codec_video_encoder_,
-                            j_init_encode_method_,
-                            j_video_codec_enum,
-                            width_,
-                            height_,
-                            kbps,
-                            fps));
+          j_get_input_buffers_method_));
   CHECK_EXCEPTION(jni);
   if (IsNull(jni, input_buffers)) {
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
-  inited_ = true;
   switch (GetIntField(jni, *j_media_codec_video_encoder_,
       j_color_format_field_)) {
     case COLOR_FormatYUV420Planar:
       encoder_fourcc_ = libyuv::FOURCC_YU12;
       break;
     case COLOR_FormatYUV420SemiPlanar:
     case COLOR_QCOM_FormatYUV420SemiPlanar:
     case COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m:
       encoder_fourcc_ = libyuv::FOURCC_NV12;
       break;
     default:
       LOG(LS_ERROR) << "Wrong color format.";
       return WEBRTC_VIDEO_CODEC_ERROR;
   }
   size_t num_input_buffers = jni->GetArrayLength(input_buffers);
   RTC_CHECK(input_buffers_.empty())
       << "Unexpected double InitEncode without Release";
   input_buffers_.resize(num_input_buffers);
   for (size_t i = 0; i < num_input_buffers; ++i) {
     input_buffers_[i] =
         jni->NewGlobalRef(jni->GetObjectArrayElement(input_buffers, i));
     int64_t yuv_buffer_capacity =
         jni->GetDirectBufferCapacity(input_buffers_[i]);
     CHECK_EXCEPTION(jni);
     RTC_CHECK(yuv_buffer_capacity >= yuv_size_) << "Insufficient capacity";
   }
   CHECK_EXCEPTION(jni);
 
+
+  inited_ = true;
   codec_thread_->PostDelayed(kMediaCodecPollMs, this);
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int32_t MediaCodecVideoEncoder::EncodeOnCodecThread(
     const webrtc::VideoFrame& frame,
     const std::vector<webrtc::FrameType>* frame_types) {
-  CheckOnCodecThread();
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
 
   if (!inited_) {
     return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
   }
+
   frames_received_++;
   if (!DeliverPendingOutputs(jni)) {
-    ResetCodec();
-    // Continue as if everything's fine.
+    if (!ResetCodecOnCodecThread())
+      return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
   if (drop_next_input_frame_) {
-    ALOGV("Encoder drop frame - failed callback.");
+    ALOGW << "Encoder drop frame - failed callback.";
     drop_next_input_frame_ = false;
     return WEBRTC_VIDEO_CODEC_OK;
   }
 
   RTC_CHECK(frame_types->size() == 1) << "Unexpected stream count";
   // Check framerate before spatial resolution change.
   if (scale_)
     quality_scaler_.OnEncodeFrame(frame);
 
   const VideoFrame& input_frame =
       scale_ ? quality_scaler_.GetScaledFrame(frame) : frame;
 
-  if (input_frame.width() != width_ || input_frame.height() != height_) {
-    ALOGD << "Frame resolution change from " << width_ << " x " << height_ <<
-        " to " << input_frame.width() << " x " << input_frame.height();
-    width_ = input_frame.width();
-    height_ = input_frame.height();
-    ResetCodec();
-    return WEBRTC_VIDEO_CODEC_OK;
+  if (!MaybeReconfigureEncoderOnCodecThread(input_frame)) {
+    ALOGE << "Failed to reconfigure encoder.";
+    return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
   // Check if we accumulated too many frames in encoder input buffers
   // or the encoder latency exceeds 70 ms and drop frame if so.
   if (frames_in_queue_ > 0 && last_input_timestamp_ms_ >= 0) {
     int encoder_latency_ms = last_input_timestamp_ms_ -
         last_output_timestamp_ms_;
     if (frames_in_queue_ > 2 || encoder_latency_ms > 70) {
       ALOGD << "Drop frame - encoder is behind by " << encoder_latency_ms <<
           " ms. Q size: " << frames_in_queue_;
       frames_dropped_++;
       // Report dropped frame to quality_scaler_.
       OnDroppedFrame();
       return WEBRTC_VIDEO_CODEC_OK;
     }
   }
 
   int j_input_buffer_index = jni->CallIntMethod(*j_media_codec_video_encoder_,
-                                                j_dequeue_input_buffer_method_);
+      j_dequeue_input_buffer_method_);
   CHECK_EXCEPTION(jni);
   if (j_input_buffer_index == -1) {
     // Video codec falls behind - no input buffer available.
-    ALOGV("Encoder drop frame - no input buffers available");
+    ALOGW << "Encoder drop frame - no input buffers available";
     frames_dropped_++;
     // Report dropped frame to quality_scaler_.
     OnDroppedFrame();
     return WEBRTC_VIDEO_CODEC_OK;  // TODO(fischman): see webrtc bug 2887.
   }
   if (j_input_buffer_index == -2) {
-    ResetCodec();
+    ResetCodecOnCodecThread();

[magjed_webrtc, 2015/10/22 23:24:17]

Should we return WEBRTC_VIDEO_CODEC_ERROR even if ResetCodecOnCodecThread() is
successful?

[perkj_webrtc, 2015/11/12 13:25:22]

Yes, it will give the upper layer the chance to fallback to a software encoder.
This is not a change in this cl.

     return WEBRTC_VIDEO_CODEC_ERROR;
   }
 
-  ALOGV("Encoder frame in # %d. TS: %lld. Q: %d",
-      frames_received_ - 1, current_timestamp_us_ / 1000, frames_in_queue_);
-
-  jobject j_input_buffer = input_buffers_[j_input_buffer_index];
-  uint8_t* yuv_buffer =
-      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_input_buffer));
-  CHECK_EXCEPTION(jni);
-  RTC_CHECK(yuv_buffer) << "Indirect buffer??";
-  RTC_CHECK(!libyuv::ConvertFromI420(
-      input_frame.buffer(webrtc::kYPlane), input_frame.stride(webrtc::kYPlane),
-      input_frame.buffer(webrtc::kUPlane), input_frame.stride(webrtc::kUPlane),
-      input_frame.buffer(webrtc::kVPlane), input_frame.stride(webrtc::kVPlane),
-      yuv_buffer, width_, width_, height_, encoder_fourcc_))
-      << "ConvertFromI420 failed";
-  last_input_timestamp_ms_ = current_timestamp_us_ / 1000;
+  last_input_timestamp_ms_ =
+      current_timestamp_us_ / rtc::kNumMicrosecsPerMillisec;
   frames_in_queue_++;
 
   // Save input image timestamps for later output
   timestamps_.push_back(input_frame.timestamp());
   render_times_ms_.push_back(input_frame.render_time_ms());
   frame_rtc_times_ms_.push_back(GetCurrentTimeMs());
 
-  bool key_frame = frame_types->front() != webrtc::kDeltaFrame;
+  const bool key_frame = frame_types->front() != webrtc::kDeltaFrame;
+  const bool encode_status =
+      EncodeByteBufferOnCodecThread(jni, key_frame, input_frame,
+          j_input_buffer_index);
+
+  current_timestamp_us_ += 1000000 / last_set_fps_;

[magjed_webrtc, 2015/10/22 23:24:17]

s/1000000/rtc::kNumMicrosecsPerSec/g

[perkj_webrtc, 2015/11/12 13:25:22]

Done.

+
+  if (!encode_status || !DeliverPendingOutputs(jni)) {
+    ALOGE << "Failed deliver pending outputs.";
+    ResetCodecOnCodecThread();
+    return WEBRTC_VIDEO_CODEC_ERROR;
+  }
+  return WEBRTC_VIDEO_CODEC_OK;
+}
+
+bool MediaCodecVideoEncoder::MaybeReconfigureEncoderOnCodecThread(
+    const webrtc::VideoFrame& frame) {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
+
+  const bool reconfigure_due_to_size =
+      frame.width() != width_ || frame.height() != height_;
+
+  if (reconfigure_due_to_size) {
+    ALOGD << "Reconfigure encoder due to frame resolution change from "
+        << width_ << " x " << height_ << " to " << frame.width() << " x "
+        << frame.height();
+    width_ = frame.width();
+    height_ = frame.height();
+  }
+
+  if (!reconfigure_due_to_size)
+    return true;
+
+  ReleaseOnCodecThread();
+
+  return InitEncodeOnCodecThread(width_, height_, 0, 0) ==
+      WEBRTC_VIDEO_CODEC_OK;
+}
+
+bool MediaCodecVideoEncoder::EncodeByteBufferOnCodecThread(JNIEnv* jni,
+    bool key_frame, const webrtc::VideoFrame& frame, int input_buffer_index) {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
+
+  ALOGV("Encoder frame in # %d. TS: %lld. Q: %d",
+      frames_received_ - 1, current_timestamp_us_ / 1000, frames_in_queue_);
+
+  jobject j_input_buffer = input_buffers_[input_buffer_index];
+  uint8_t* yuv_buffer =
+      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_input_buffer));
+  CHECK_EXCEPTION(jni);
+  RTC_CHECK(yuv_buffer) << "Indirect buffer??";
+  RTC_CHECK(!libyuv::ConvertFromI420(
+      frame.buffer(webrtc::kYPlane), frame.stride(webrtc::kYPlane),
+      frame.buffer(webrtc::kUPlane), frame.stride(webrtc::kUPlane),
+      frame.buffer(webrtc::kVPlane), frame.stride(webrtc::kVPlane),
+      yuv_buffer, width_, width_, height_, encoder_fourcc_))
+      << "ConvertFromI420 failed";
+
   bool encode_status = jni->CallBooleanMethod(*j_media_codec_video_encoder_,
-                                              j_encode_method_,
+                                              j_encode_buffer_method_,
                                               key_frame,
-                                              j_input_buffer_index,
+                                              input_buffer_index,
                                               yuv_size_,
                                               current_timestamp_us_);
   CHECK_EXCEPTION(jni);
-  current_timestamp_us_ += 1000000 / last_set_fps_;
-
-  if (!encode_status || !DeliverPendingOutputs(jni)) {
-    ResetCodec();
-    return WEBRTC_VIDEO_CODEC_ERROR;
-  }
-
-  return WEBRTC_VIDEO_CODEC_OK;
+  return encode_status;
 }
 
 int32_t MediaCodecVideoEncoder::RegisterEncodeCompleteCallbackOnCodecThread(
     webrtc::EncodedImageCallback* callback) {
-  CheckOnCodecThread();
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
   callback_ = callback;
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int32_t MediaCodecVideoEncoder::ReleaseOnCodecThread() {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   if (!inited_) {
     return WEBRTC_VIDEO_CODEC_OK;
   }
-  CheckOnCodecThread();
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ALOGD << "EncoderReleaseOnCodecThread: Frames received: " <<
       frames_received_ << ". Encoded: " << frames_encoded_ <<
       ". Dropped: " << frames_dropped_;
   ScopedLocalRefFrame local_ref_frame(jni);
   for (size_t i = 0; i < input_buffers_.size(); ++i)
     jni->DeleteGlobalRef(input_buffers_[i]);
   input_buffers_.clear();
   jni->CallVoidMethod(*j_media_codec_video_encoder_, j_release_method_);
   CHECK_EXCEPTION(jni);
   rtc::MessageQueueManager::Clear(this);
   inited_ = false;
   ALOGD << "EncoderReleaseOnCodecThread done.";
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int32_t MediaCodecVideoEncoder::SetRatesOnCodecThread(uint32_t new_bit_rate,
                                                       uint32_t frame_rate) {
-  CheckOnCodecThread();
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   if (last_set_bitrate_kbps_ == new_bit_rate &&
       last_set_fps_ == frame_rate) {
     return WEBRTC_VIDEO_CODEC_OK;
   }
   JNIEnv* jni = AttachCurrentThreadIfNeeded();
   ScopedLocalRefFrame local_ref_frame(jni);
   if (new_bit_rate > 0) {
     last_set_bitrate_kbps_ = new_bit_rate;
   }
   if (frame_rate > 0) {
     last_set_fps_ = frame_rate;
   }
   bool ret = jni->CallBooleanMethod(*j_media_codec_video_encoder_,
                                        j_set_rates_method_,
                                        last_set_bitrate_kbps_,
                                        last_set_fps_);
   CHECK_EXCEPTION(jni);
   if (!ret) {
-    ResetCodec();
+    ResetCodecOnCodecThread();
     return WEBRTC_VIDEO_CODEC_ERROR;
   }
   return WEBRTC_VIDEO_CODEC_OK;
 }
 
 int MediaCodecVideoEncoder::GetOutputBufferInfoIndex(
     JNIEnv* jni,
     jobject j_output_buffer_info) {
   return GetIntField(jni, j_output_buffer_info, j_info_index_field_);
 }
@@ skipping 11 matching lines @@
 }
 
 jlong MediaCodecVideoEncoder::GetOutputBufferInfoPresentationTimestampUs(
     JNIEnv* jni,
     jobject j_output_buffer_info) {
   return GetLongField(
       jni, j_output_buffer_info, j_info_presentation_timestamp_us_field_);
 }
 
 bool MediaCodecVideoEncoder::DeliverPendingOutputs(JNIEnv* jni) {
+  RTC_DCHECK(codec_thread_checker_.CalledOnValidThread());
   while (true) {
     jobject j_output_buffer_info = jni->CallObjectMethod(
         *j_media_codec_video_encoder_, j_dequeue_output_buffer_method_);
     CHECK_EXCEPTION(jni);
     if (IsNull(jni, j_output_buffer_info)) {
       break;
     }
 
     int output_buffer_index =
         GetOutputBufferInfoIndex(jni, j_output_buffer_info);
     if (output_buffer_index == -1) {
-      ResetCodec();
+      ResetCodecOnCodecThread();
       return false;
     }
 
     // Get key and config frame flags.
     jobject j_output_buffer =
         GetOutputBufferInfoBuffer(jni, j_output_buffer_info);
     bool key_frame = GetOutputBufferInfoIsKeyFrame(jni, j_output_buffer_info);
 
     // Get frame timestamps from a queue - for non config frames only.
     int64_t frame_encoding_time_ms = 0;
@@ skipping 103 matching lines @@
           }
           scPosition += naluPosition;
           scPositions[scPositionsLength++] = scPosition;
           scPosition += H264_SC_LENGTH;
         }
         if (scPositionsLength == 0) {
           ALOGE << "Start code is not found!";
           ALOGE << "Data:" <<  image->_buffer[0] << " " << image->_buffer[1]
               << " " << image->_buffer[2] << " " << image->_buffer[3]
               << " " << image->_buffer[4] << " " << image->_buffer[5];
-          ResetCodec();
+          ResetCodecOnCodecThread();
           return false;
         }
         scPositions[scPositionsLength] = payload_size;
         header.VerifyAndAllocateFragmentationHeader(scPositionsLength);
         for (size_t i = 0; i < scPositionsLength; i++) {
           header.fragmentationOffset[i] = scPositions[i] + H264_SC_LENGTH;
           header.fragmentationLength[i] =
               scPositions[i + 1] - header.fragmentationOffset[i];
           header.fragmentationPlType[i] = 0;
           header.fragmentationTimeDiff[i] = 0;
         }
       }
 
       callback_status = callback_->Encoded(*image, &info, &header);
     }
 
     // Return output buffer back to the encoder.
     bool success = jni->CallBooleanMethod(*j_media_codec_video_encoder_,
                                           j_release_output_buffer_method_,
                                           output_buffer_index);
     CHECK_EXCEPTION(jni);
     if (!success) {
-      ResetCodec();
+      ResetCodecOnCodecThread();
       return false;
     }
 
     if (callback_status > 0) {
       drop_next_input_frame_ = true;
       // Theoretically could handle callback_status<0 here, but unclear what
       // that would mean for us.
     }
   }
 
@@ skipping 92 matching lines @@
 }
 
 void MediaCodecVideoEncoderFactory::DestroyVideoEncoder(
     webrtc::VideoEncoder* encoder) {
   ALOGD << "Destroy video encoder.";
   delete encoder;
 }
 
 }  // namespace webrtc_jni