Packet payload mapping for robust transmission of data
Systems and methods for packet payload mapping for robust transmission of data are described. For example, methods may include receiving, using a network interface, packets that each respectively include a primary frame and one or more preceding frames from the sequence of frames of data that are separated from the primary frame in the sequence of frames by a respective multiple of a stride parameter; storing the frames of the packets in a buffer with entries that each hold the primary frame and the one or more preceding frames of a packet; reading a first frame from the buffer as the primary frame from one of the entries; determining that a packet with a primary frame that is a next frame in the sequence has been lost; and, responsive to the determination, reading the next frame from the buffer as a preceding frame from one of the entries.
1 . A system for receiving data partitioned into a sequence of frames of data, comprising:
a network interface;
a memory; and
a processor, wherein the memory includes instructions executable by the processor to cause the system to:
receive, using the network interface, packets encoded according to a packet payload mapping scheme, each packet respectively encoded to include a primary frame and one or more preceding frames from the sequence of frames of data,
wherein the one or more preceding frames of a respective packet are separated from the primary frame of the respective packet in the sequence of frames by a respective multiple of a stride parameter and the one or more preceding frames of the respective packet include a number of preceding frames equal to a redundancy parameter,
wherein the stride parameter is equal to or greater than a minimum number of sequential packets associated with recovery from a packet loss event; and
store the frames of the packets in a buffer with entries that each hold the primary frame and the one or more preceding frames of a packet, wherein the buffer is sized to store frames from a number of packets equal to the stride parameter times the redundancy parameter plus one.
2 . The system of claim 1 , wherein the memory includes instructions executable by the processor to cause the system to:
read a first frame from the buffer as the primary frame from one of the entries of the buffer.
3 . The system of claim 2 , wherein the memory includes instructions executable by the processor to cause the system to:
determine, based on the buffer, that a packet with a primary frame that is a next frame in the sequence of frames of data has been lost.
4 . The system of claim 3 , wherein the memory includes instructions executable by the processor to cause the system to:
responsive to the determination that the packet was lost, read the next frame from the buffer as a preceding frame from one of the entries of the buffer.
5 . The system of claim 4 , wherein the memory includes instructions executable by the processor to cause the system to:
write frames, including the first frame and the next frame, that are read from the buffer to a reassembly buffer, wherein the reassembly buffer includes entries that each consist of a frame of the sequence of frames of data.
6 . The system of claim 1 , wherein the memory includes instructions executable by the processor to cause the system to:
store the packets in a jitter buffer as they are received; and
read the packets from the jitter buffer before storing the frames of the packets in the buffer.
7 . The system of claim 1 , wherein the memory includes instructions executable by the processor to cause the system to:
receive, using the network interface, a packet map data structure that indicates the stride parameter and indicates a count of redundant preceding frames to be transmitted in each of the packets.
8 . The system of claim 1 , wherein the sequence of frames of data is a sequence of frames of audio data.
9 . A method for receiving data partitioned into a sequence of frames of data, comprising:
receiving, using a network interface, packets encoded according to a packet payload mapping scheme, each packet respectively encoded to include a primary frame and one or more preceding frames from the sequence of frames of data,
wherein the one or more preceding frames of a respective packet are separated from the primary frame of the respective packet in the sequence of frames by a respective multiple of a stride parameter and the one or more preceding frames of the respective packet include a number of preceding frames equal to a redundancy parameter,
wherein the stride parameter is equal to or greater than a minimum number of sequential packets associated with recovery from a packet loss event; and
storing the frames of the packets in a buffer with entries that each hold the primary frame and the one or more preceding frames of a packet, wherein the buffer is sized to store frames from a number of packets equal to the stride parameter times the redundancy parameter plus one.
10 . The method of claim 9 , further comprising:
reading a first frame from the buffer as the primary frame from one of the entries of the buffer.
11 . The method of claim 10 , further comprising:
determining, based on the buffer, that a packet with a primary frame that is a next frame in the sequence of frames of data has been lost.
12 . The method of claim 11 , further comprising:
responsive to the determination that the packet was lost, reading the next frame from the buffer as a preceding frame from one of the entries of the buffer.
13 . The method of claim 12 , further comprising:
writing frames, including the first frame and the next frame, that are read from the buffer to a reassembly buffer, wherein the reassembly buffer includes entries that each consist of a frame of the sequence of frames of data.
14 . The method of claim 13 , wherein the reassembly buffer is sized to store a number of frames equal to the stride parameter.
15 . The method of claim 13 , further comprising:
playing audio data that is stored in an oldest frame from the reassembly buffer; and
deleting the oldest frame from the reassembly buffer.
16 . The method of claim 9 , further comprising:
storing the packets in a jitter buffer as they are received; and
reading the packets from the jitter buffer before storing the frames of the packets in the buffer.