Fixes two bugs when decoding with packet losses.

Disable _missingFrame bit since we can't set it correctly with FEC.

No longer return more than one decoded frame per Decode() call.
This is a work-around for a bug where the frame info map was popped more often than items were added to the map.

BUG=
TEST=

Review URL: http://webrtc-codereview.appspot.com/215001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@722 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/video_coding/codecs/interface/video_error_codes.h

@@ -16,6 +16,7 @@
 // Define return values
 
 #define WEBRTC_VIDEO_CODEC_REQUEST_SLI 2
+#define WEBRTC_VIDEO_CODEC_NO_OUTPUT 1
 #define WEBRTC_VIDEO_CODEC_OK 0
 #define WEBRTC_VIDEO_CODEC_ERROR -1
 #define WEBRTC_VIDEO_CODEC_LEVEL_EXCEEDED -2

src/modules/video_coding/codecs/vp8/main/source/vp8.cc

@@ -835,9 +835,6 @@ VP8Decoder::Decode(const EncodedImage& inputImage,
             return WEBRTC_VIDEO_CODEC_ERROR;
         }
         img = vpx_codec_get_frame(_decoder, &iter);
-        ret = ReturnFrame(img, inputImage._timeStamp);
-        if (ret != 0)
-            return ret;
         iter = NULL;
     }
 
@@ -966,7 +963,7 @@ VP8Decoder::ReturnFrame(const vpx_image_t* img, WebRtc_UWord32 timeStamp)
     if (img == NULL)
     {
         // Decoder OK and NULL image => No show frame
-        return WEBRTC_VIDEO_CODEC_OK;
+        return WEBRTC_VIDEO_CODEC_NO_OUTPUT;
     }
 
     // Allocate memory for decoded image

src/modules/video_coding/main/source/frame_buffer.cc

@@ -343,7 +343,10 @@ VCMFrameBuffer::RestructureFrameInformation()
     PrepareForDecode();
     _frameType = ConvertFrameType(_sessionInfo.FrameType());
     _completeFrame = _sessionInfo.IsSessionComplete();
-    _missingFrame = _sessionInfo.PreviousFrameLoss();
+    // TODO(holmer): This bit is disabled for now since we can't tell whether
+    // we have had a full frame loss or if we've just lost an FEC/empty packet.
+    // _missingFrame = _sessionInfo.PreviousFrameLoss();
+    _missingFrame = false;
 }
 
 WebRtc_Word32

src/modules/video_coding/main/source/generic_decoder.cc

@@ -30,7 +30,8 @@ VCMDecodedFrameCallback::~VCMDecodedFrameCallback()
     delete &_critSect;
 }
 
-void VCMDecodedFrameCallback::SetUserReceiveCallback(VCMReceiveCallback* receiveCallback)
+void VCMDecodedFrameCallback::SetUserReceiveCallback(
+    VCMReceiveCallback* receiveCallback)
 {
     CriticalSectionScoped cs(_critSect);
     _receiveCallback = receiveCallback;
@@ -38,18 +39,27 @@ void VCMDecodedFrameCallback::SetUserReceiveCallback(VCMReceiveCallback* receive
 
 WebRtc_Word32 VCMDecodedFrameCallback::Decoded(RawImage& decodedImage)
 {
+    // TODO(holmer): We should improve this so that we can handle multiple
+    // callbacks from one call to Decode().
     CriticalSectionScoped cs(_critSect);
-    VCMFrameInformation* frameInfo = static_cast<VCMFrameInformation*>(_timestampMap.Pop(decodedImage._timeStamp));
+    VCMFrameInformation* frameInfo = static_cast<VCMFrameInformation*>(
+        _timestampMap.Pop(decodedImage._timeStamp));
     if (frameInfo == NULL)
     {
+        // The map should never be empty or full if this callback is called.
         return WEBRTC_VIDEO_CODEC_ERROR;
     }
 
-    WebRtc_Word32 ret = _timing.StopDecodeTimer(decodedImage._timeStamp, frameInfo->decodeStartTimeMs, VCMTickTime::MillisecondTimestamp());
+    _timing.StopDecodeTimer(
+        decodedImage._timeStamp,
+        frameInfo->decodeStartTimeMs,
+        VCMTickTime::MillisecondTimestamp());
 
     if (_receiveCallback != NULL)
     {
-        _frame.Swap(decodedImage._buffer, decodedImage._length, decodedImage._size);
+        _frame.Swap(decodedImage._buffer,
+                    decodedImage._length,
+                    decodedImage._size);
         _frame.SetWidth(decodedImage._width);
         _frame.SetHeight(decodedImage._height);
         _frame.SetTimeStamp(decodedImage._timeStamp);
@@ -58,18 +68,18 @@ WebRtc_Word32 VCMDecodedFrameCallback::Decoded(RawImage& decodedImage)
         WebRtc_Word32 callbackReturn = _receiveCallback->FrameToRender(_frame);
         if (callbackReturn < 0)
         {
-            return callbackReturn;
+            WEBRTC_TRACE(webrtc::kTraceDebug,
+                         webrtc::kTraceVideoCoding,
+                         -1,
+                         "Render callback returned error: %d", callbackReturn);
         }
     }
-    if (ret < 0)
-    {
-        return ret;
-    }
     return WEBRTC_VIDEO_CODEC_OK;
 }
 
 WebRtc_Word32
-VCMDecodedFrameCallback::ReceivedDecodedReferenceFrame(const WebRtc_UWord64 pictureId)
+VCMDecodedFrameCallback::ReceivedDecodedReferenceFrame(
+    const WebRtc_UWord64 pictureId)
 {
     CriticalSectionScoped cs(_critSect);
     if (_receiveCallback != NULL)
@@ -125,7 +135,9 @@ VCMGenericDecoder::~VCMGenericDecoder()
 {
 }
 
-WebRtc_Word32 VCMGenericDecoder::InitDecode(const VideoCodec* settings, WebRtc_Word32 numberOfCores, bool requireKeyFrame)
+WebRtc_Word32 VCMGenericDecoder::InitDecode(const VideoCodec* settings,
+                                            WebRtc_Word32 numberOfCores,
+                                            bool requireKeyFrame)
 {
     _requireKeyFrame = requireKeyFrame;
     _keyFrameDecoded = false;
@@ -149,9 +161,10 @@ WebRtc_Word32 VCMGenericDecoder::Decode(const VCMEncodedFrame& frame)
     _frameInfos[_nextFrameInfoIdx].renderTimeMs = frame.RenderTimeMs();
     _callback->Map(frame.TimeStamp(), &_frameInfos[_nextFrameInfoIdx]);
 
-    WEBRTC_TRACE(webrtc::kTraceDebug, webrtc::kTraceVideoCoding, VCMId(_id),
-               "Decoding timestamp %u",
-               frame.TimeStamp());
+    WEBRTC_TRACE(webrtc::kTraceDebug,
+                 webrtc::kTraceVideoCoding,
+                 VCMId(_id),
+                 "Decoding timestamp %u", frame.TimeStamp());
 
     _nextFrameInfoIdx = (_nextFrameInfoIdx + 1) % kDecoderFrameMemoryLength;
 
@@ -167,6 +180,12 @@ WebRtc_Word32 VCMGenericDecoder::Decode(const VCMEncodedFrame& frame)
         _callback->Pop(frame.TimeStamp());
         return ret;
     }
+    else if (ret == WEBRTC_VIDEO_CODEC_NO_OUTPUT ||
+             ret == WEBRTC_VIDEO_CODEC_REQUEST_SLI)
+    {
+        // No output
+        _callback->Pop(frame.TimeStamp());
+    }
     // Update the key frame decoded variable so that we know whether or not we've decoded a key frame since reset.
     _keyFrameDecoded = (frame.FrameType() == kVideoFrameKey || frame.FrameType() == kVideoFrameGolden);
     return ret;

src/modules/video_coding/main/source/timing.cc

@@ -199,7 +199,7 @@ VCMTiming::StopDecodeTimer(WebRtc_UWord32 timeStamp,
     {
         WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceVideoCoding, VCMId(_vcmId, _timingId),
             "Codec timer error: %d", timeDiffMs);
-        return timeDiffMs;
+        assert(false);
     }
 
     if (_master)