Define EncodedVideoSource and RtcCapturedEncodingVideoCapturer.

content/renderer/media/rtc_encoding_video_capturer_factory.cc

+// Copyright (c) 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_encoding_video_capturer_factory.h"
+
+#include "base/logging.h"
+#include "content/renderer/media/rtc_encoding_video_capturer.h"
+#include "media/base/encoded_bitstream_buffer.h"
+
+namespace content {
+
+RtcEncodingVideoCapturerFactory::RtcEncodingVideoCapturerFactory()
+    : encoded_video_source_(NULL),
+      next_stream_id_(1) {
+}
+
+RtcEncodingVideoCapturerFactory::~RtcEncodingVideoCapturerFactory() {
+  for (EncoderMap::iterator it = encoder_map_.begin(); it != encoder_map_.end();
+      ++it)
+    delete it->second;

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

STLDeleteValues(&encoder_map_);

[hshi1, 2013/06/10 21:49:35]

Thanks for the suggestion, done (although I'm using STLDeleteElements as the map
should really be a set.)

+  if (encoded_video_source_)
+    encoded_video_source_->RemoveCapabilitiesObserver(this);
+}
+
+void RtcEncodingVideoCapturerFactory::OnEncodedVideoSourceAdded(
+    media::EncodedVideoSource* source) {
+  // TODO: support multiple encoded video sources.
+  // For now we only support one instance of encoded video source at a time.

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

This doesn't seem super-legit, since the caller won't know it's being ignored...
Does this belong at the caller and a DCHECK here?

[hshi1, 2013/06/10 21:49:35]

Done.

+  if (!encoded_video_source_) {
+    encoded_video_source_ = source;
+    source->AddCapabilitiesObserver(this);
+  }
+}
+
+void RtcEncodingVideoCapturerFactory::OnEncodedVideoSourceRemoved(
+    media::EncodedVideoSource* source) {
+  if (source && encoded_video_source_ == source) {
+    source->RemoveCapabilitiesObserver(this);
+    encoded_video_source_ = NULL;
+  }
+}
+
+void RtcEncodingVideoCapturerFactory::OnCapabilitiesAvailable(
+    media::EncodedVideoSource* source) {
+  if (source && encoded_video_source_ == source)
+    RebuildCodecsList();
+}
+
+webrtc::VideoEncoder* RtcEncodingVideoCapturerFactory::CreateVideoEncoder(
+    webrtc::VideoCodecType type) {
+  for (size_t i = 0; i < codecs_.size(); ++i) {
+    if (codecs_[i].type == type) {
+      RtcEncodingVideoCapturer* capturer =

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

neither |type| nor |i| are used in l.54-58; suspicious!

[hshi1, 2013/06/10 21:49:35]

Oops. I should pass the type to the ctor of the encoding capturer. Done.

+          new RtcEncodingVideoCapturer(next_stream_id_, encoded_video_source_);
+      if (capturer)

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

can never fail

[hshi1, 2013/06/10 21:49:35]

Done.

+        encoder_map_[next_stream_id_++] = capturer;
+      return capturer;
+    }
+  }
+  return NULL;
+}
+
+void RtcEncodingVideoCapturerFactory::DestroyVideoEncoder(
+    webrtc::VideoEncoder* encoder) {
+  for (EncoderMap::iterator it = encoder_map_.begin(); it != encoder_map_.end();

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

lol it's a map but you never use it as such.
typedef std::set<VideoEncoder*> EncoderSet;
?

[hshi1, 2013/06/10 21:49:35]

Done.

+      ++it) {
+    if (it->second == encoder) {
+      delete encoder;
+      encoder_map_.erase(it);
+      return;
+    }
+  }
+}
+
+const std::vector<WebRtcVideoEncoderFactory::VideoCodec>&
+RtcEncodingVideoCapturerFactory::codecs() const {
+  return codecs_;
+}
+
+void RtcEncodingVideoCapturerFactory::RebuildCodecsList() {
+  codecs_.clear();
+
+  DCHECK(encoded_video_source_);
+  if (!encoded_video_source_)
+    return;

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

l.85-86 unnecessary

[hshi1, 2013/06/10 21:49:35]

Done.

+
+  media::VideoEncodingCapability caps =
+      encoded_video_source_->GetCapabilities();
+  for (size_t i = 0; i < caps.size(); ++i) {
+    webrtc::VideoCodecType webrtc_codec_type = webrtc::kVideoCodecGeneric;
+    switch (caps[i].codec_type) {
+      case media::kCodecVP8:
+        webrtc_codec_type = webrtc::kVideoCodecVP8;
+        break;
+      default:
+        webrtc_codec_type = webrtc::kVideoCodecGeneric;

[Ami GONE FROM CHROMIUM, 2013/06/08 00:18:01]

unnecessary given l.91

[hshi1, 2013/06/10 21:49:35]

Done.

+        break;
+    }
+    codecs_.push_back(WebRtcVideoEncoderFactory::VideoCodec(
+        webrtc_codec_type,
+        caps[i].codec_name,
+        caps[i].max_resolution.width(),
+        caps[i].max_resolution.height(),
+        caps[i].max_frames_per_second));
+  }
+}
+
+}  // namespace content