H264 decoder for webRTC.

content/renderer/media/rtc_video_encoder.cc

Index: content/renderer/media/rtc_video_encoder.cc
diff --git a/content/renderer/media/rtc_video_encoder.cc b/content/renderer/media/rtc_video_encoder.cc
index 1b33fc54c90abe6881a48565c6d9fbb4aa58b513..591c9cb9c04c10fe3ee52897b0918731ffa57d11 100644
--- a/content/renderer/media/rtc_video_encoder.cc
+++ b/content/renderer/media/rtc_video_encoder.cc
@@ -648,6 +648,20 @@ void RTCVideoEncoder::ReturnEncodedImage(scoped_ptr<webrtc::EncodedImage> image,
   if (!encoded_image_callback_)
     return;
 
+  std::vector<int> offsets;
+  size_t i;
+  uint32 acc = 0;
+  for (i = 0; i < image->_length; ++i) {
+    acc = (acc << 8) | image->_buffer[i];
+    if ((acc & 0xffffff00) == 0x100)
+      offsets.push_back(i - 3);
+  }
+
+  // Generate a header describing a single fragment.
+  webrtc::RTPFragmentationHeader header;
+  memset(&header, 0, sizeof(header));
+  header.VerifyAndAllocateFragmentationHeader(offsets.size());
+
   webrtc::CodecSpecificInfo info;
   memset(&info, 0, sizeof(info));
   info.codecType = video_codec_type_;
@@ -657,14 +671,15 @@ void RTCVideoEncoder::ReturnEncodedImage(scoped_ptr<webrtc::EncodedImage> image,
     info.codecSpecific.VP8.keyIdx = -1;
   }
 
-  // Generate a header describing a single fragment.
-  webrtc::RTPFragmentationHeader header;
-  memset(&header, 0, sizeof(header));
-  header.VerifyAndAllocateFragmentationHeader(1);
-  header.fragmentationOffset[0] = 0;
-  header.fragmentationLength[0] = image->_length;
-  header.fragmentationPlType[0] = 0;
-  header.fragmentationTimeDiff[0] = 0;
+  for (i = 0; i < offsets.size(); ++i) {
+    uint32_t length = (i == offsets.size() - 1) ?
+        (image->_length - offsets[i]) : (offsets[i + 1] - offsets[i]);
+
+    header.fragmentationOffset[i] = offsets[i] + 3;
+    header.fragmentationLength[0] = length - 3;

[Stefan, 2014/08/07 19:17:27]

Shouldn't this be header.fragmentationLength[i]

[hshi1, 2014/08/07 19:32:10]

sorry for the typo, yes this should be [i] not [0]. after this the decoder is
indeed initialized so I can investigate further. Still getting decode errors
though.

+    header.fragmentationPlType[0] = 0;
+    header.fragmentationTimeDiff[0] = 0;
+  }
 
   int32_t retval = encoded_image_callback_->Encoded(*image, &info, &header);
   if (retval < 0) {