[Cast] Size-Adaptable platform video encoders.

media/cast/sender/video_sender.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cast/sender/video_sender.h"
 
 #include <algorithm>
 #include <cstring>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "media/cast/cast_defines.h"
 #include "media/cast/net/cast_transport_config.h"
-#include "media/cast/sender/external_video_encoder.h"
-#include "media/cast/sender/video_encoder_impl.h"
-#include "media/cast/sender/video_frame_factory.h"
-
-#if defined(OS_MACOSX)
-#include "media/cast/sender/h264_vt_encoder.h"
-#endif
+#include "media/cast/sender/video_encoder.h"
 
 namespace media {
 namespace cast {
 
 namespace {
 
 // The following two constants are used to adjust the target
 // playout delay (when allowed). They were calculated using
 // a combination of cast_benchmark runs and manual testing.
 //
@@ skipping 32 matching lines @@
             NewFixedCongestionControl(
                 (video_config.min_bitrate + video_config.max_bitrate) / 2) :
             NewAdaptiveCongestionControl(cast_environment->Clock(),
                                          video_config.max_bitrate,
                                          video_config.min_bitrate,
                                          video_config.max_frame_rate)),
       frames_in_encoder_(0),
       last_bitrate_(0),
       playout_delay_change_cb_(playout_delay_change_cb),
       weak_factory_(this) {
-#if defined(OS_MACOSX)
-  // On Apple platforms, use the hardware H.264 encoder if possible. It is the
-  // only reasonable option for iOS.
-  if (!video_config.use_external_encoder &&
-      video_config.codec == CODEC_VIDEO_H264) {
-    video_encoder_.reset(new H264VideoToolboxEncoder(
-        cast_environment,
-        video_config,
-        gfx::Size(video_config.width, video_config.height),
-        status_change_cb));
-  }
-#endif  // defined(OS_MACOSX)
-#if !defined(OS_IOS)
-  if (video_config.use_external_encoder) {
-    video_encoder_.reset(new ExternalVideoEncoder(
-        cast_environment,
-        video_config,
-        gfx::Size(video_config.width, video_config.height),
-        status_change_cb,
-        create_vea_cb,
-        create_video_encode_mem_cb));
-  } else if (!video_encoder_) {
-    // Software encoder is initialized immediately.
-    video_encoder_.reset(new VideoEncoderImpl(
-        cast_environment, video_config, status_change_cb));
-  }
-#endif  // !defined(OS_IOS)
-
+  video_encoder_ = VideoEncoder::Create(
+      cast_environment_,
+      video_config,
+      status_change_cb,
+      create_vea_cb,
+      create_video_encode_mem_cb);
   if (!video_encoder_) {
     cast_environment_->PostTask(
         CastEnvironment::MAIN,
         FROM_HERE,
         base::Bind(status_change_cb, STATUS_UNSUPPORTED_CODEC));
   }
 
   media::cast::CastTransportRtpConfig transport_config;
   transport_config.ssrc = video_config.ssrc;
   transport_config.feedback_ssrc = video_config.receiver_ssrc;
@@ skipping 83 matching lines @@
     return;
   }
 
   uint32 bitrate = congestion_control_->GetBitrate(
         reference_time + target_playout_delay_, target_playout_delay_);
   if (bitrate != last_bitrate_) {
     video_encoder_->SetBitRate(bitrate);
     last_bitrate_ = bitrate;
   }
 
+  if (video_frame->visible_rect().IsEmpty()) {
+    VLOG(1) << "Rejecting empty video frame.";
+    return;
+  }
+
   if (video_encoder_->EncodeVideoFrame(
           video_frame,
           reference_time,
           base::Bind(&VideoSender::OnEncodedVideoFrame,
                      weak_factory_.GetWeakPtr(),
                      bitrate))) {
     frames_in_encoder_++;
     duration_in_encoder_ += duration_added_by_next_frame;
     last_enqueued_frame_rtp_timestamp_ = rtp_timestamp;
     last_enqueued_frame_reference_time_ = reference_time;
@@ skipping 33 matching lines @@
   DCHECK_GE(frames_in_encoder_, 0);
 
   duration_in_encoder_ =
       last_enqueued_frame_reference_time_ - encoded_frame->reference_time;
 
   SendEncodedFrame(encoder_bitrate, encoded_frame.Pass());
 }
 
 }  // namespace cast
 }  // namespace media