System and method for optimizing multimedia compression using plural encoders

• US 7,720,999 B2
• Filed: 11/26/2002
• Issued: 05/18/2010
• Est. Priority Date: 11/26/2002
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Lane, Richard D.
• Primary Examiner(s): BAROT, BHARAT
• Application Number:
  US10/305,581
• Publication Number:
  US 20040103216A1
• Time in Patent Office: 2,730 Days
• Field of Search: 709231-234, 709202-203, 709217-219, 709246-247, 370464-465, 370328-330, 370229-235
• US Class Current: 709/247
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04N 19/12 Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/164 Feedback from the receiver or from the transmission channel
• CPC Class Codes: H04N 19/179 the unit being a scene or a shot
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer

Abstract

A multimedia stream is compressed in parallel by plural encoders, the compressed stream outputs of which are dynamically evaluated for merit. A best one of the compressed streams is transmitted, along with information regarding the particular compression algorithm that was used, so that the receiver'"'"'s decoder can decompress the stream for presentation.

Claims

1. A method for processing a multimedia stream, comprising:

rendering, from the multimedia stream, a first compressed stream comprising a first base layer and a first enhancement layer using a first compression algorithm;

in parallel therewith, rendering, from the multimedia stream, at least a second compressed stream comprising a second base layer and a second enhancement layer using a second compression algorithm;

evaluating at least the first and second compressed streams;

via a selection processor, selecting, based on the evaluating act, one of the compressed streams as a best stream, wherein the best stream selection is based on numbers of bits per second of the first and second base layers relative to a base layer compression threshold and numbers of bits per second of the first and second enhancement layers relative to an enhancement layer compression threshold; and

transmitting the selected best stream.

2. The method of claim 1, wherein the first compressed stream is rendered using a first encoder executing the first compression algorithm and the second compressed stream is rendered using a second encoder executing the second compression algorithm.

3. The method of claim 1, further comprising rendering at least a third compressed stream from the multimedia stream using a third compression algorithm in parallel with rendering the first and second compressed streams.

4. The method of claim 1, further comprising transmitting information representative of the compression algorithm of the selected compressed stream.

5. The method of claim 4, further comprising using the information representative of the compression algorithm of the selected compressed stream to configure a decoder for facilitating decompressing the selected compressed scheme.

6. The method of claim 1, wherein the evaluating act is undertaken at least in part by evaluating a compression quality.

7. The method of claim 1, wherein the evaluating act is based at least in part on compression effectiveness.

8. The method of claim 1, wherein the evaluating act is based at least in part on requirements of aggregated transmission channels.

9. The method of claim 1, wherein the evaluating act is based at least in part on capabilities of transmission channels.

10. The method of claim 1, wherein the transmitting act is undertaken wirelessly.

11. The method of claim 10, wherein the transmitting act is undertaken using code division multiple access (CDMA) principles.

12. The method of claim 10, wherein the transmitting act is undertaken using orthogonal frequency-division multiplexing (OFDM) principles.

13. The method of claim 10, wherein the transmitting act is undertaken using digital broadcast principles.

14. A system for encoding an original multimedia stream for transmission, comprising:

a first encoder encoding the original stream using at least a first encoding algorithm to render a first encoded stream comprising a first base layer and a first enhancement layer;

a second encoder encoding the original stream, in parallel with the first encoder encoding the original stream, using at least a second encoding algorithm to render a second encoded stream comprising a second base layer and a second enhancement layer; and

a processor selecting a best stream out of the first and second encoded streams, wherein said best stream selection is based on numbers of bits per second of the first and second base layers relative to a base layer compression threshold and numbers of bits per second of the first and second enhancement layers relative to an enhancement layer compression threshold to render a selected stream representative of the original stream.

15. The system of claim 14, wherein the processor executes the selecting act at least in part based on qualities of each encoded stream.

16. The system of claim 14, wherein the processor executes the selecting act at least in part based on compression effectiveness.

17. The system of claim 14, further comprising a wireless transmitter for transmitting an encoded stream.

18. The system of claim 14, wherein the processor executes the selecting act plural times for the original stream.

19. The system of claim 14, further comprising a least a third encoder.

20. The system of claim 14, wherein the processor sends, along with the selected stream, information pertaining to the respective algorithm of the respective encoder from which the selected stream was generated.

21. The system of claim 14, further comprising a decoder selecting a decoding algorithm using the information.

22. The system of claim 14, wherein the processor executes the selecting act at least in part based on requirements of aggregated channels.

23. The system of claim 14, wherein the processor executes the selecting act at least in part based on capabilities of transmission channels.

24. The system of claim 14, wherein the processor sends, on a separate channel from the selected stream, information pertaining to the encoder generating the selected stream.

25. The system of claim 17, wherein the wireless transmitter is a code division multiple access (CDMA) transmitter.

26. The system of claim 17, wherein the wireless transmitter is an orthogonal frequency division multiplexing (OFDM) transmitter.

27. The system of claim 17, wherein the wireless transmitter is a digital broadcast transmitter.

28. A product for selecting a compressed stream for transmission, comprising:

means for deriving a first compressed stream comprising a first base layer and a first enhancement layer from a multimedia stream using a first compression algorithm;

means for deriving a second compressed stream comprising a second base layer and a second enhancement layer from the multimedia stream using a second compression algorithm, wherein the first compressed stream is derived in parallel with the second compressed stream; and

means for dynamically selecting a best stream, selected from one of the compressed Streams, wherein the best stream selection is based on numbers of bits per second of the first and second base layers relative to a base layer compression threshold and numbers of bits per second of the first and second enhancement layers relative to an enhancement layer compression threshold for transmission.

29. The product of claim 28, further comprising means for sending, along with the selected one of the compressed streams, an indication of a compression scheme used to generate the selected one of the compressed streams.

30. The product of claim 29, further comprising means for transmitting the selected one of the compressed streams.

31. The product of claim 30, further comprising means for decompressing the selected one of the compressed streams when received, at least in part using the indication of a compression scheme.

32. The product of claim 31, further comprising means for sending, on a separate channel from the selected stream, information pertaining to the means generating the selected stream.

33. The product of claim 32, further comprising wireless transmission means for wirelessly transmitting the selected stream.

34. The product of claim 33, wherein the wireless transmission means is a code division multiple access (CDMA) transmitter.

35. The product of claim 33, wherein the wireless transmission means is an orthogonal frequency division multiplexing (OFDM) transmitter.

36. The product of claim 33, wherein the wireless transmission means is a digital broadcast transmitter.