H264 decoder for webRTC.

content/renderer/media/rtc_video_encoder.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.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 630 matching lines @@
                                          int32 bitstream_buffer_id,
                                          uint16 picture_id) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DVLOG(3) << "ReturnEncodedImage(): "
            << "bitstream_buffer_id=" << bitstream_buffer_id
            << ", picture_id=" << picture_id;
 
   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_;
   if (video_codec_type_ == webrtc::kVideoCodecVP8) {
     info.codecSpecific.VP8.pictureId = picture_id;
     info.codecSpecific.VP8.tl0PicIdx = -1;
     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) {
     DVLOG(2) << "ReturnEncodedImage(): encoded_image_callback_ returned "
              << retval;
   }
 
   // The call through webrtc::EncodedImageCallback is synchronous, so we can
   // immediately recycle the output buffer back to the Impl.
   gpu_factories_->GetTaskRunner()->PostTask(
@@ skipping 17 matching lines @@
   UMA_HISTOGRAM_BOOLEAN("Media.RTCVideoEncoderInitEncodeSuccess",
                         init_retval == WEBRTC_VIDEO_CODEC_OK);
   if (init_retval == WEBRTC_VIDEO_CODEC_OK) {
     UMA_HISTOGRAM_ENUMERATION("Media.RTCVideoEncoderProfile",
                               video_codec_profile_,
                               media::VIDEO_CODEC_PROFILE_MAX + 1);
   }
 }
 
 }  // namespace content