Transmission apparatus and reception apparatus for parallel data streams

A wireless stream receiving device comprising:

• a communication unit configured to receive a packet for a picture from a wireless stream transmitting device and demodulate the packet to output a data stream comprising a header and data for each of a plurality of regions constituting the picture, based on wireless communication;
• a data stream (DS) processor which, when a header corresponding to a region is not received or the header corresponding to the region is a compact header, restores the header corresponding to the region by using the compact header or a header corresponding to at least another region, and outputs a bit stream comprising the restored header and the data;
• and
• a decoder which decodes the bit stream to restore the picture,
• wherein the DS processor restores the header corresponding to the region, based on a transmission mode,
• wherein the transmission mode comprises a first mode to a third mode,
• wherein the first mode is a mode in which all of the headers for the plurality of regions are directly transmitted,
• wherein the second mode is a mode in which, when some headers among the headers for the plurality of regions are identical, only one header among the identical some headers is transmitted, and when syntax elements are identical between the some headers, at least one header among the some headers is modified to the compact header, and
• wherein the third mode is a mode in which, when the some headers among the headers for the plurality of regions are identical, any one header is modified to a first compact header and another header is modified to a second compact header.