Transmitting device, receiving device, transmitting method and receiving method

A receiving device comprising:

• a processor;
• and
• a non-transitory memory having stored thereon executable instructions, which when executed, cause the processor to perform:
• sequentially receiving a transmitting packet including a packet header of a fixed length and a payload of a variable length;
• converting a packet into a first packet to output the first packet at a first fixed bit rate, the packet being stored in the transmitting packet and including a packet header of a variable length and a payload of a variable length, and the first packet including a packet header of a fixed length of a decompressed header;
• converting the first packet into a second packet to output the second packet at a second fixed bit rate, the second packet including a packet header and a payload of a variable length;
• converting the second packet into a Network Abstraction Layer (NAL) unit to output the NAL unit at a third fixed bit rate;
• generating an access unit from a plurality of the sequentially accumulated NAL units to output the access unit at a timing of a decoding time corresponding to the access unit;
• and
• decoding the access unit,
• wherein in the converting the packet into the first packet to output the first packet at the first fixed rate, an extraction rate is set to a transmission rate of the first packet having the packet header of the fixed length obtained by decompressing the packet header of the variable length.

A transmitting method comprising:

• generating an encoded stream by using rate control satisfying a determined definition to guarantee a buffering operation in a receiving device;
• and
• sequentially transmitting a transmitting packet obtained by packetizing the encoded stream,
• wherein
• the transmitting packet includes a packet header of a fixed length and a payload of a variable length, and
• the determined definition is determined by
• converting a packet into a first packet to output the first packet at a first fixed bit rate, the packet being stored in the transmitting packet sequentially received by the receiving device and including a packet header of a variable length and a payload of a variable length, and the first packet including a packet header of a fixed length of a decompressed header,
• converting the first packet into a second packet to output the second packet at a second fixed bit rate, the second packet including a packet header and a payload of a variable length,
• converting the second packet into a Network Abstraction Layer (NAL) unit to output the NAL unit at a third fixed bit rate, and
• generating an access unit from a plurality of the sequentially accumulated NAL units to output the access unit for decoding in the receiving device at a timing of a decoding time corresponding to the access unit, and
• in the converting the packet into the first packet to output the first packet at the first fixed rate, an extraction rate is set to a transmission rate of the first packet having the packet header of the fixed length obtained by decompressing the packet header of the variable length.

A receiving method comprising:

• sequentially receiving a transmitting packet including a packet header of a fixed length and a payload of a variable length;
• converting a packet into a first packet to output the first packet at a first fixed bit rate, the packet being stored in the transmitting packet and including a packet header of a variable length and a payload of a variable length, and the first packet including a packet header of a fixed length of a decompressed header;
• converting the first packet into a second packet to output the second packet at a second fixed bit rate, the second packet including a packet header and a payload of a variable length;
• converting the second packet into a Network Abstraction Layer (NAL) unit to output the NAL unit at a third fixed bit rate;
• generating an access unit from a plurality of the sequentially accumulated NAL units to output the access unit at a timing of a decoding time corresponding to the access unit;
• and
• decoding the access unit, and
• wherein in the converting the packet into the first packet to output the first packet at the first fixed rate, an extraction rate is set to a transmission rate of the first packet having the packet header of the fixed length obtained by decompressing the packet header of the variable length.