FFMPEG plugin: Tell the FFMPEG library to handle incomplete data.

- It is just one flag that needs to be set, so that streaming video data can be
  handled by the FFMPEG library.

- For reference: This flag is based on FFMPEG's 0.10.2 video decode example
  (doc/example/decoding_encoding.c).

- The _DecodeNextVideoFrame() method needs to be adjusted (still to come), to
  take streamed data into account. So the flag on its own doesn't help, but it
  is a reasonable step in that direction.

Signed-off-by: Colin Günther <coling@gmx.de>

src/add-ons/media/plugins/ffmpeg/AVCodecDecoder.cpp

@@ -430,6 +430,11 @@ AVCodecDecoder::_NegotiateVideoOutputFormat(media_format* inOutFormat)
 	fContext->extradata = (uint8_t*)fExtraData;
 	fContext->extradata_size = fExtraDataSize;
 
+	if (fCodec->capabilities & CODEC_CAP_TRUNCATED)
+		// Expect and handle video frames to be splitted across consecutive
+		// data chunks.
+		fContext->flags |= CODEC_FLAG_TRUNCATED;
+
 	TRACE("  requested video format 0x%x\n",
 		inOutFormat->u.raw_video.display.format);