AndroidVideoTrackSource implementation

webrtc/api/androidvideotracksource.cc

+/*
+ *  Copyright (c) 2016 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 "webrtc/api/androidvideotracksource.h"
+
+#include <utility>
+
+namespace webrtc {
+
+AndroidVideoTrackSource::AndroidVideoTrackSource(rtc::Thread* signaling_thread,
+                                                 JNIEnv* jni,
+                                                 jobject j_egl_context)
+    : signaling_thread_(signaling_thread),
+      surface_texture_helper_(webrtc_jni::SurfaceTextureHelper::create(
+          jni,
+          "Camera SurfaceTextureHelper",
+          j_egl_context)) {
+  LOG(LS_INFO) << "AndroidVideoTrackSource ctor";
+  worker_thread_checker_.DetachFromThread();
+  camera_thread_checker_.DetachFromThread();
+}
+
+bool AndroidVideoTrackSource::GetStats(AndroidVideoTrackSource::Stats* stats) {
+  rtc::CritScope lock(&stats_crit_);
+
+  if (!stats_) {
+    return false;
+  }
+
+  *stats = *stats_;
+  return true;
+}
+
+void AndroidVideoTrackSource::SetState(SourceState state) {
+  if (rtc::Thread::Current() != signaling_thread_) {
+    invoker_.AsyncInvoke<void>(
+        RTC_FROM_HERE, signaling_thread_,
+        rtc::Bind(&AndroidVideoTrackSource::SetState, this, state));
+    return;
+  }
+
+  if (state_ != state) {
+    state_ = state;
+    FireOnChanged();
+  }
+}
+
+void AndroidVideoTrackSource::AddOrUpdateSink(
+    rtc::VideoSinkInterface<cricket::VideoFrame>* sink,
+    const rtc::VideoSinkWants& wants) {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+
+  broadcaster_.AddOrUpdateSink(sink, wants);
+  OnSinkWantsChanged(broadcaster_.wants());
+}
+
+void AndroidVideoTrackSource::RemoveSink(
+    rtc::VideoSinkInterface<cricket::VideoFrame>* sink) {
+  RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
+
+  broadcaster_.RemoveSink(sink);
+  OnSinkWantsChanged(broadcaster_.wants());
+}
+
+void AndroidVideoTrackSource::OnSinkWantsChanged(
+    const rtc::VideoSinkWants& wants) {
+  {
+    rtc::CritScope lock(&apply_rotation_crit_);
+    apply_rotation_ = wants.rotation_applied;
+  }
+
+  video_adapter_.OnResolutionRequest(wants.max_pixel_count,
+                                     wants.max_pixel_count_step_up);
+}
+
+void AndroidVideoTrackSource::OnByteBufferFrameCaptured(const void* frame_data,
+                                                        int length,
+                                                        int width,
+                                                        int height,
+                                                        int rotation,
+                                                        int64_t timestamp_ns) {
+  RTC_DCHECK(camera_thread_checker_.CalledOnValidThread());
+  RTC_DCHECK(rotation == 0 || rotation == 90 || rotation == 180 ||
+             rotation == 270);
+
+  int adapted_width;
+  int adapted_height;
+  int crop_width;
+  int crop_height;
+  int crop_x;
+  int crop_y;
+  int64_t translated_camera_time_us;
+
+  if (!AdaptFrame(width, height, timestamp_ns / rtc::kNumNanosecsPerMicrosec,
+                  &adapted_width, &adapted_height, &crop_width, &crop_height,
+                  &crop_x, &crop_y, &translated_camera_time_us)) {
+    return;
+  }
+
+  int rotated_width = crop_width;
+  int rotated_height = crop_height;
+
+  rtc::CritScope lock(&apply_rotation_crit_);
+  if (apply_rotation_ && (rotation == 90 || rotation == 270)) {
+    std::swap(adapted_width, adapted_height);
+    std::swap(rotated_width, rotated_height);
+  }
+
+  rtc::scoped_refptr<webrtc::VideoFrameBuffer> buffer =
+      pre_scale_pool_.CreateBuffer(rotated_width, rotated_height);
+
+  const uint8_t* y_plane = static_cast<const uint8_t*>(frame_data);
+  const uint8_t* uv_plane = y_plane + width * height;
+  int uv_width = (width + 1) / 2;
+
+  RTC_CHECK_GE(length, width * height + 2 * uv_width * ((height + 1) / 2));
+
+  // Can only crop at even pixels.
+  crop_x &= ~1;
+  crop_y &= ~1;
+
+  libyuv::NV12ToI420Rotate(
+      y_plane + width * crop_y + crop_x, width,
+      uv_plane + uv_width * crop_y + crop_x, width, buffer->MutableDataY(),
+      buffer->StrideY(),
+      // Swap U and V, since we have NV21, not NV12.
+      buffer->MutableDataV(), buffer->StrideV(), buffer->MutableDataU(),
+      buffer->StrideU(), crop_width, crop_height,
+      static_cast<libyuv::RotationMode>(apply_rotation_ ? rotation : 0));
+
+  if (adapted_width != buffer->width() || adapted_height != buffer->height()) {
+    rtc::scoped_refptr<webrtc::I420Buffer> scaled_buffer(
+        post_scale_pool_.CreateBuffer(adapted_width, adapted_height));
+    scaled_buffer->ScaleFrom(buffer);
+    buffer = scaled_buffer;
+  }
+
+  OnFrame(cricket::WebRtcVideoFrame(
+              buffer,
+              apply_rotation_ ? webrtc::kVideoRotation_0
+                              : static_cast<webrtc::VideoRotation>(rotation),
+              translated_camera_time_us),
+          width, height);
+}
+
+void AndroidVideoTrackSource::OnTextureFrameCaptured(
+    int width,
+    int height,
+    int rotation,
+    int64_t timestamp_ns,
+    const webrtc_jni::NativeHandleImpl& handle) {
+  RTC_DCHECK(camera_thread_checker_.CalledOnValidThread());
+  RTC_DCHECK(rotation == 0 || rotation == 90 || rotation == 180 ||
+             rotation == 270);
+
+  int adapted_width;
+  int adapted_height;
+  int crop_width;
+  int crop_height;
+  int crop_x;
+  int crop_y;
+  int64_t translated_camera_time_us;
+
+  if (!AdaptFrame(width, height, timestamp_ns / rtc::kNumNanosecsPerMicrosec,
+                  &adapted_width, &adapted_height, &crop_width, &crop_height,
+                  &crop_x, &crop_y, &translated_camera_time_us)) {
+    surface_texture_helper_->ReturnTextureFrame();
+    return;
+  }
+
+  webrtc_jni::Matrix matrix = handle.sampling_matrix;
+
+  matrix.Crop(crop_width / static_cast<float>(width),
+              crop_height / static_cast<float>(height),
+              crop_x / static_cast<float>(width),
+              crop_y / static_cast<float>(height));
+
+  rtc::CritScope lock(&apply_rotation_crit_);
+  if (apply_rotation_) {
+    if (rotation == webrtc::kVideoRotation_90 ||
+        rotation == webrtc::kVideoRotation_270) {
+      std::swap(adapted_width, adapted_height);
+    }
+    matrix.Rotate(static_cast<webrtc::VideoRotation>(rotation));
+  }
+
+  OnFrame(cricket::WebRtcVideoFrame(
+              surface_texture_helper_->CreateTextureFrame(
+                  adapted_width, adapted_height,
+                  webrtc_jni::NativeHandleImpl(handle.oes_texture_id, matrix)),
+              apply_rotation_ ? webrtc::kVideoRotation_0
+                              : static_cast<webrtc::VideoRotation>(rotation),
+              translated_camera_time_us),
+          width, height);
+}
+
+void AndroidVideoTrackSource::OnFrame(const cricket::VideoFrame& frame,
+                                      int width,
+                                      int height) {
+  {
+    rtc::CritScope lock(&stats_crit_);
+    stats_ = rtc::Optional<AndroidVideoTrackSource::Stats>({width, height});
+  }
+
+  broadcaster_.OnFrame(frame);
+}
+
+void AndroidVideoTrackSource::OnOutputFormatRequest(int width,
+                                                    int height,
+                                                    int fps) {
+  RTC_DCHECK(camera_thread_checker_.CalledOnValidThread());
+
+  cricket::VideoFormat format(width, height,
+                              cricket::VideoFormat::FpsToInterval(fps), 0);
+  video_adapter_.OnOutputFormatRequest(format);
+}
+
+bool AndroidVideoTrackSource::AdaptFrame(int width,
+                                         int height,
+                                         int64_t camera_time_us,
+                                         int* out_width,
+                                         int* out_height,
+                                         int* crop_width,
+                                         int* crop_height,
+                                         int* crop_x,
+                                         int* crop_y,
+                                         int64_t* translated_camera_time_us) {
+  RTC_DCHECK(camera_thread_checker_.CalledOnValidThread());
+
+  int64_t system_time_us = rtc::TimeMicros();
+
+  int64_t offset_us =
+      timestamp_aligner_.UpdateOffset(camera_time_us, system_time_us);
+
+  if (!broadcaster_.frame_wanted()) {
+    return false;
+  }
+
+  if (!video_adapter_.AdaptFrameResolution(
+          width, height, camera_time_us * rtc::kNumNanosecsPerMicrosec,
+          crop_width, crop_height, out_width, out_height)) {
+    // VideoAdapter dropped the frame.
+    return false;
+  }
+  *crop_x = (width - *crop_width) / 2;
+  *crop_y = (height - *crop_height) / 2;
+
+  *translated_camera_time_us = timestamp_aligner_.ClipTimestamp(
+      camera_time_us + offset_us, system_time_us);
+  return true;
+}
+
+}  // namespace webrtc