Error concealment and error resilience
View Patent ↗A system and method of transmitting video packets to enhance error concealment and error resilience are provided. The method includes encoding a first macroblock of video data into a video packet. The method also includes determining whether a length of the video packet including the first macroblock exceeds a threshold length. The method also includes encoding a second macroblock into the video packet as the final macroblock when the length of the video packet with the first macrobock exceeds the threshold length. The method also includes transmitting the video packet.
1. A method of transmitting video data, the method comprising:
encoding a first macroblock of video data into a video packet;
determining whether a length of the video packet including the first macroblock exceeds a threshold length;
encoding a second macroblock into the video packet as a final macroblock when the length of the video packet with the first macroblock exceeds the threshold length; and
transmitting the video packet.
2. The method of claim 1 , wherein encoding the first macroblock of video data includes performing a discrete cosine transformation and subsequent quantization.
3. The method of claim 1 , wherein encoding the first macroblock of video data includes performing a DC and AC predictor encoding.
4. The method of claim 1 , wherein determining whether the length of the video packet including the first macroblock exceeds the threshold length comprises estimating a length of the video packet.
5. The method of claim 4 , wherein the length of the video packet is estimated based at least partially on a number of macroblocks included in the video packet.
6. The method of claim 1 , wherein determining whether the length of the video packet including the first macroblock exceeds the threshold length comprises calculating an actual bit length of the video packet.
7. The method of claim 1 , further comprising:
encoding the second macroblock as the final macroblock after determining that the length of the video packet including the first macroblock exceeds the threshold length; and
adding the final macroblock to the video packet.
8. The method of claim 1 , wherein the first macroblock is not recoded when the length of the video packet with the first macroblock exceeds the threshold length.
9. A video data encoder, comprising:
a discrete cosine transform that receives macroblocks of video data and outputs transformation data;
a quantizer that quantizes the transformation data;
an encoder that encodes the quantized transformation data; and
a variable length coder that arranges the quantized transformation data by groups of macroblocks into video packets by adding blocks of quantized transformation data to a video packet until a length of the video packet exceeds a first threshold length, and adding a next block of quantized transformation data after the length of the video packet exceeds the first threshold length.
10. The video data encoder of claim 9 , wherein the variable length coder adds the next block of quantized transformation data to the video packet when a predicted length of the video packet including the next block of quantized transformation data does not exceed a second threshold length.
11. The video data encoder of claim 10 , wherein the variable length coder re-encodes a previous block of quantized transformation data as the final block when addition of the next block of quantized transformation data would result in the length of the video packet exceeding the second threshold length.
12. The video data encoder of claim 9 , wherein the variable length coder does not re-encode a previous block of quantized transformation data as the final block.