SYSTEMS AND METHODS FOR RECORDING AND PLAYBACK OF MULTIPLE VARIABLE RATE DATA STREAMS

• US 20190196741A1
• Filed: 12/21/2017
• Published: 06/27/2019
• Est. Priority Date: 12/21/2017
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola Solutions, Inc.
• Inventors: Guillen, Adrian, Hegberg, Joel, Lampert, Chet A.
• Granted Patent: US 10,452,318 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 16/13 File access structures, e.g. distributed indices arrangements of input from, or output to, record carriers G06F3/06
• CPC Class Codes: G06F 16/164 File meta data generation
• CPC Class Codes: G06F 3/0613 in relation to throughput
• CPC Class Codes: G06F 3/0656 Data buffering arrangements
• CPC Class Codes: G06F 3/0659 Command handling arrangements, e.g. command buffers, queues, command scheduling
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0673 Single storage device

Abstract

Systems and methods for recording and playback of multiple data streams. One device includes a storage controller coupled to an electronic storage device, a first data buffer storing data received from a first data stream, a second data buffer storing data received from a second data stream, a fragment buffer storing fragment metadata, a storage buffer including a plurality of data fragments, and an electronic processor. The electronic processor receives information designating a data stream storage area of the electronic storage device. The electronic processor arbitrates between the first and second data buffers to select a data fragment for writing to the storage buffer. The electronic processor writes the data fragment to the storage buffer, and writes fragment metadata defining the data fragment to the fragment buffer. The electronic processor controls the storage controller to sequentially write from the plurality of data fragments to the data stream storage area.

Claims

1. An electronic device for recording multiple data streams, the device comprising:

a storage controller coupled to an electronic storage device;

a first data buffer storing data received from a first data stream;

a second data buffer storing data received from a second data stream;

a fragment buffer storing fragment metadata;

a storage buffer including a plurality of data fragments; and

an electronic processor communicatively coupled to the storage controller, the first data buffer, the second data buffer, the fragment buffer, and the storage buffer, and configured to

receive information designating a data stream storage area of the electronic storage device,

arbitrate between the first data buffer and the second data buffer to select a data fragment for writing to the storage buffer,

write the data fragment to the storage buffer,

write fragment metadata defining the data fragment to the fragment buffer, and

control the storage controller to sequentially write from the plurality of data fragments of the storage buffer to the data stream storage area of the electronic storage device.

2. The electronic device for recording multiple data streams of claim 1, wherein the electronic processor is further configured to arbitrate between the first data buffer and the second data buffer to select a data fragment by

determining a data rate for the first data stream;

determining a data rate for the second data stream;

determining a current usage for the first data buffer;

determining a current usage for the second data buffer;

for each of the first data buffer and the second data buffer, determining a priority value based on the data rate, the current usage, and a total capacity of the data buffer; and

comparing the priority values to determine the data buffer having the highest priority.

3. The electronic device for recording multiple data streams of claim 1, wherein the electronic processor is further configured to

receive information designating a metadata storage area of the electronic storage device,

monitor a usage of the fragment buffer, and

when the usage of the fragment buffer exceeds a threshold, control the storage controller to write a portion of the fragment metadata from the fragment buffer to the metadata storage area of the electronic storage device.

4. The electronic device for recording multiple data streams of claim 3, wherein the electronic processor is further configured to

receive an indication to stop writing data to the electronic storage device, and

in response to receiving the indication,

control the storage controller to flush the fragment metadata from the fragment buffer to the metadata storage area of the electronic storage device, and

initiate a file system generation process in a file system definition area of the electronic storage device based on the fragment metadata and the plurality of data fragments.

5. The electronic device for recording multiple data streams of claim 4, wherein the electronic processor is further configured to receive an indication to stop writing data to the electronic storage device by determining that both the first and second data buffers are empty.

6. The electronic device for recording multiple data streams of claim 1, further comprising:

a second fragment buffer communicatively coupled to the electronic processor,

wherein the electronic processor is further configured to

write fragment metadata defining the data fragment to the fragment buffer when the data fragment is selected from the first data buffer, and

write fragment metadata defining the data fragment to the second fragment buffer when the data fragment is selected from the second data buffer.

7. The electronic device for recording multiple data streams of claim 1, further comprising:

a memory,

wherein the first data buffer, the second data buffer, the fragment buffer, and the storage buffer are first in, first out queues implemented in the memory.

8. The electronic device for recording multiple data streams of claim 1, wherein the first data stream and the second data stream are each one selected from the group consisting of a radiofrequency data stream, a video data stream, an audio data stream, and a keystroke data stream.

9. The electronic device for recording multiple data streams of claim 1, wherein the fragment metadata defining the data fragment includes at least one selected from the group consisting of a block location on the electronic storage device, a size for the data fragment, a skip count indicating lost bytes, and an end of stream indicator.

10. The electronic device for recording multiple data streams of claim 1, wherein the electronic processor is further configured to

receive a data stream playback command;

and

in response to receiving the data stream playback command,

retrieve the fragment metadata from the electronic storage device,

retrieve, from a first portion of the data stream storage area of the electronic storage device designated in the fragment metadata, a first subset of the plurality of data fragments corresponding to the first data stream,

retrieve, from a second portion of the data stream storage area of the electronic storage device designated in the fragment metadata, a second subset of the plurality of data fragments corresponding to the second data stream,

write the first subset of the plurality of data fragments to the first data buffer, and

write the second subset of the plurality of data fragments to the second data buffer.

11. A method for recording multiple data streams, the method comprising:

receiving, with an electronic processor, information designating a data stream storage area of an electronic storage device,

arbitrating between a first data buffer receiving from a first data stream and a second data buffer receiving from a second data stream to select a data fragment for writing to a storage buffer,

writing the data fragment to a plurality of data fragments stored in the storage buffer,

writing fragment metadata defining the data fragment to a fragment buffer, and

sequentially writing, with a storage controller, from the plurality of data fragments to the data stream storage area of the electronic storage device.

12. The method for recording multiple data streams of claim 11, wherein arbitrating between the first data buffer and the second data buffer to select a data fragment includes

determining a data rate for the first data stream;

determining a data rate for the second data stream;

determining a current usage for the first data buffer;

determining a current usage for the second data buffer;

for each of the first data buffer and the second data buffer, determining a priority value based on the data rate, the current usage, and a total capacity of the data buffer; and

comparing the priority values to determine the data buffer having the highest priority.

13. The method for recording multiple data streams of claim 11, further comprising:

receiving information designating a metadata storage area of the electronic storage device,

monitoring a usage of the fragment buffer, and

when the usage of the fragment buffer exceeds a threshold, controlling the storage controller to write a portion of the fragment metadata from the fragment buffer to the metadata storage area of the electronic storage device.

14. The method for recording multiple data streams of claim 13, further comprising:

receive an indication to stop writing data to the electronic storage device, and

in response to receiving the indication to stop writing data to the electronic storage device,

control the storage controller to flush the fragment metadata from the fragment buffer to the metadata storage area of the electronic storage device, and

initiate a file system generation process in a file system definition area of the electronic storage device based on the fragment metadata and the plurality of data fragments.

15. The method for recording multiple data streams of claim 14, wherein receiving an indication to stop writing data to the electronic storage device includes determining that both the first and second data buffers are empty.

16. The method for recording multiple data streams of claim 11, further comprising:

writing fragment metadata defining the data fragment to the fragment buffer when the data fragment is selected from the first data buffer, and

write fragment metadata defining the data fragment to a second fragment buffer when the data fragment is selected from the second data buffer.

17. The method for recording multiple data streams of claim 11, wherein writing fragment metadata defining the data fragment to the fragment buffer includes writing at least one selected from the group consisting of a block location on the electronic storage device, a size for the data fragment, a skip count indicating lost bytes, and an end of stream indicator.

18. The method for recording multiple data streams of claim 11, further comprising:

receiving a data stream playback command; and

in response to receiving the data stream playback command,

retrieving the fragment metadata from the electronic storage device,

retrieving, from a first portion of the data stream storage area of the electronic storage device designated in the fragment metadata, a first subset of the plurality of data fragments corresponding to the first data stream,

retrieving, from a second portion of the data stream storage area of the electronic storage device designated in the fragment metadata, a second subset of the plurality of data fragments corresponding to the second data stream,

writing the first subset of the plurality of data fragments to the first data buffer, and

writing the second subset of the plurality of data fragments to the second data buffer.