Add media::VideoEncodeAccelerator with WebRTC integration

content/renderer/media/rtc_video_encoder_factory.cc

+// Copyright 2013 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 "content/renderer/media/rtc_video_encoder_factory.h"
+
+#include "content/common/gpu/client/gpu_video_encode_accelerator_host.h"
+#include "content/renderer/media/rtc_video_encoder.h"
+#include "media/filters/gpu_video_accelerator_factories.h"
+#include "media/video/video_encode_accelerator.h"
+
+namespace content {
+
+namespace {
+
+// Translate from media::VideoEncodeAccelerator::SupportedProfile to
+// cricket::WebRtcVideoEncoderFactory::VideoCodec
+cricket::WebRtcVideoEncoderFactory::VideoCodec GVEAToWebRTCCodec(

[Ami GONE FROM CHROMIUM, 2013/07/31 23:01:12]

s/GVEA/VEA/

[sheu, 2013/08/02 01:27:49]

Done.

+    const media::VideoEncodeAccelerator::SupportedProfile& profile) {
+  webrtc::VideoCodecType type = webrtc::kVideoCodecUnknown;
+  std::string name;
+  int width = 0, height = 0, fps = 0;
+
+  if (profile.profile >= media::VP8PROFILE_MIN &&
+      profile.profile <= media::VP8PROFILE_MAX) {
+    type = webrtc::kVideoCodecVP8;
+    name = std::string("VP8");

[Ami GONE FROM CHROMIUM, 2013/07/31 23:01:12]

here and elsewhere, the explicit std::string() is unnecessary.

[sheu, 2013/08/02 01:27:49]

Done.

+  } else if (profile.profile >= media::H264PROFILE_MIN &&
+             profile.profile <= media::H264PROFILE_MAX) {
+    type = webrtc::kVideoCodecGeneric;
+    name = std::string("CAST1");
+  }
+
+  if (type != webrtc::kVideoCodecUnknown) {
+    width = profile.max_resolution.width();
+    height = profile.max_resolution.height();
+    DCHECK_EQ(profile.max_framerate.denominator, 1U);
+    fps = profile.max_framerate.numerator;

[Ami GONE FROM CHROMIUM, 2013/07/31 23:01:12]

DCHECK_EQ(denominator, 1);
or handle the division.

[sheu, 2013/08/02 01:27:49]

The DCHECK is above, maybe not where you'd expect.  I moved it.

+  }
+
+  return cricket::WebRtcVideoEncoderFactory::VideoCodec(
+      type, name, width, height, fps);
+}
+
+// Translate from cricket::WebRtcVideoEncoderFactory::VideoCodec to
+// media::VideoCodecProfile.  Pick a default profile for each codec type.
+media::VideoCodecProfile WebRTCCodecToVideoCodecProfile(
+    webrtc::VideoCodecType type) {
+  switch (type) {
+    case webrtc::kVideoCodecVP8:
+      return media::VP8PROFILE_MAIN;
+    case webrtc::kVideoCodecGeneric:
+      return media::H264PROFILE_MAIN;
+    default:
+      return media::VIDEO_CODEC_PROFILE_UNKNOWN;
+  }
+}
+
+}  // anonymous namespace
+
+RTCVideoEncoderFactory::RTCVideoEncoderFactory(
+    const scoped_refptr<media::GpuVideoAcceleratorFactories>& gpu_factories)
+    : gpu_factories_(gpu_factories) {
+  // Query media::VideoEncodeAccelerator (statically) for our supported codecs.
+  std::vector<media::VideoEncodeAccelerator::SupportedProfile> profiles =
+      GpuVideoEncodeAcceleratorHost::GetSupportedProfiles();
+  for (size_t i = 0; i < profiles.size(); ++i) {
+    VideoCodec codec = GVEAToWebRTCCodec(profiles[i]);
+    if (codec.type != webrtc::kVideoCodecUnknown)
+      codecs_.push_back(codec);
+  }
+}
+
+RTCVideoEncoderFactory::~RTCVideoEncoderFactory() {}
+
+webrtc::VideoEncoder* RTCVideoEncoderFactory::CreateVideoEncoder(
+    webrtc::VideoCodecType type) {
+  bool found = false;
+  for (size_t i = 0; i < codecs_.size(); ++i) {
+    if (codecs_[i].type == type) {
+      found = true;
+      break;
+    }
+  }
+  if (!found)
+    return NULL;
+  // GpuVideoAcceleratorFactories is not thread safe. It cannot be shared
+  // by different decoders. Since we aren't running on the child thread and

[Ami GONE FROM CHROMIUM, 2013/07/31 23:01:12]

s/decoders/encoders/

[sheu, 2013/08/02 01:27:49]

Done.

+  // cannot create a new factory, clone one instead.
+  return new RTCVideoEncoder(WebRTCCodecToVideoCodecProfile(type),
+                             gpu_factories_->Clone());
+}
+
+void RTCVideoEncoderFactory::AddObserver(Observer* observer) {
+  // No-op: our codec list is populated on installation.

[Ami GONE FROM CHROMIUM, 2013/07/31 23:01:12]

Yeah, I doubt this is going to fly...

[sheu, 2013/08/02 01:27:49]

It does quite nicely.

According to the interface the Observer is only notified if the codec list is
not populated at creation time.  Since we do that statically, we don't need to
notify observers.

+}
+
+void RTCVideoEncoderFactory::RemoveObserver(Observer* observer) {}
+
+const std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec>&
+RTCVideoEncoderFactory::codecs() const {
+  return codecs_;
+}
+
+void RTCVideoEncoderFactory::DestroyVideoEncoder(
+    webrtc::VideoEncoder* encoder) {
+  delete encoder;
+}
+
+}  // namespace content