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 VEAToWebRTCCodec(
+    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 = "VP8";
+  } else if (profile.profile >= media::H264PROFILE_MIN &&
+             profile.profile <= media::H264PROFILE_MAX) {
+    type = webrtc::kVideoCodecGeneric;
+    name = "CAST1";
+  }
+
+  if (type != webrtc::kVideoCodecUnknown) {
+    width = profile.max_resolution.width();
+    height = profile.max_resolution.height();
+    fps = profile.max_framerate.numerator;
+    DCHECK_EQ(profile.max_framerate.denominator, 1U);

[Ami GONE FROM CHROMIUM, 2013/08/02 18:42:40]

ugh, no, you had it in a better place before.  Not sure how I missed it. 

[sheu, 2013/08/03 01:31:03]

Ha.  I  actually like it where it is now better :-)

+  }
+
+  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 = VEAToWebRTCCodec(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 encoders. Since we aren't running on the child thread and
+  // 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, 2013/08/02 18:42:40]

What I was referring to was that if a renderer<->GPU roundtrip really was
necessary (to get supported codecs) then this would not be a viable approach.
Since you can hard-code supported profiles in the short term, this is fine.

+}
+
+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