media/cast/sender/video_encoder.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/cast/sender/video_encoder.h"
   6
   7 #include "media/cast/sender/external_video_encoder.h"
   8 #include "media/cast/sender/video_encoder_impl.h"
   9
  10 #if defined(OS_MACOSX)
  11 #include "media/cast/sender/h264_vt_encoder.h"
  12 #endif
  13
  14 namespace media {
  15 namespace cast {
  16
  17 // static
  18 scoped_ptr<VideoEncoder> VideoEncoder::Create(
  19       const scoped_refptr<CastEnvironment>& cast_environment,
  20       const VideoSenderConfig& video_config,
  21       const StatusChangeCallback& status_change_cb,
  22       const CreateVideoEncodeAcceleratorCallback& create_vea_cb,
  23       const CreateVideoEncodeMemoryCallback& create_video_encode_memory_cb) {
  24   // On MacOS or IOS, attempt to use the system VideoToolbox library to
  25   // perform optimized H.264 encoding.
  26 #if defined(OS_MACOSX) || defined(OS_IOS)
  27   if (!video_config.use_external_encoder &&
  28       H264VideoToolboxEncoder::IsSupported(video_config)) {
  29     return scoped_ptr<VideoEncoder>(new H264VideoToolboxEncoder(
  30         cast_environment, video_config, status_change_cb));
  31   }
  32 #endif  // defined(OS_MACOSX)
  33
  34 #if !defined(OS_IOS)
  35   // If the system provides a hardware-accelerated encoder, use it.
  36   if (ExternalVideoEncoder::IsSupported(video_config)) {
  37     return scoped_ptr<VideoEncoder>(new SizeAdaptableExternalVideoEncoder(
  38         cast_environment,
  39         video_config,
  40         status_change_cb,
  41         create_vea_cb,
  42         create_video_encode_memory_cb));
  43   }
  44
  45   // Attempt to use the software encoder implementation.
  46   if (VideoEncoderImpl::IsSupported(video_config)) {
  47     return scoped_ptr<VideoEncoder>(new VideoEncoderImpl(
  48         cast_environment,
  49         video_config,
  50         status_change_cb));
  51   }
  52 #endif  // !defined(OS_IOS)
  53
  54   // No encoder implementation will suffice.
  55   return nullptr;
  56 }
  57
  58 scoped_ptr<VideoFrameFactory> VideoEncoder::CreateVideoFrameFactory() {
  59   return nullptr;
  60 }
  61
  62 void VideoEncoder::EmitFrames() {
  63 }
  64
  65 }  // namespace cast
  66 }  // namespace media