Source classification using HDMI audio metadata

1. An apparatus to perform source classification using high definition multimedia interface (HDMI) audio metadata, the apparatus comprising:

a metadata extractor to:

extract values of audio encoding parameters from HDMI metadata obtained from a monitored HDMI port of a media device, the HDMI metadata corresponding to media being output from the monitored HDMI port;

map the extracted values of the audio encoding parameters to a first unique encoding class (UEC) in a set of defined UECs, different ones of the set of defined UECs corresponding to different combinations of possible values of the audio encoding parameters capable of being included in the HDMI metadata; and

identify a media source corresponding to the media output from the HDMI port based on one or more possible media sources mapped to the first UEC.

2. The apparatus of claim 1 , wherein the HDMI metadata is extracted prior to being decoded.

3. The apparatus of claim 1 , wherein the HDMI metadata is included in an audio stream output from the monitored HDMI port of the media device.

4. The apparatus of claim 3 , wherein the audio stream includes transport parameters and licensed encoded audio data.

5. The apparatus of claim 4 , wherein the extracted values correspond to the transport parameters.

6. The apparatus of claim 1 , wherein the metadata extractor to determine a disambiguation confidence associated with the first UEC when mapping the extracted values of the audio encoding parameters to the first UEC.

7. The apparatus of claim 6 , wherein the metadata extractor to determine a number of values in the first UEC that match a number of values in a defined UEC when determining the disambiguation confidence.

8. The apparatus of claim 7 , wherein the metadata extractor to identify the media source as being mapped to the first UEC when identifying the media source.

9. A non-transitory computer readable storage medium comprising instructions which, when executed, cause one or more processors to at least:

extract values of audio encoding parameters from HDMI metadata obtained from a monitored HDMI port of a media device, the HDMI metadata corresponding to media being output from the monitored HDMI port;

map the extracted values of the audio encoding parameters to a first unique encoding class (UEC) in a set of defined UECs, different ones of the set of defined UECs corresponding to different combinations of possible values of the audio encoding parameters capable of being included in the HDMI metadata; and

identify a media source corresponding to the media output from the HDMI port based on one or more possible media sources mapped to the first UEC.

10. The computer readable medium of claim 9 , wherein the HDMI metadata is included in an audio stream output from the monitored HDMI port of the media device, the audio stream includes transport parameters and licensed encoded audio data.

11. The computer readable medium of claim 10 , wherein the extracted values correspond to the transport parameters.

12. The computer readable medium of claim 9 , wherein the instructions, when executed, cause the one or more processors to determine a disambiguation confidence associated with the first UEC when mapping the extracted values of the audio encoding parameters to the first UEC.

13. The computer readable medium of claim 12 , wherein the instructions, when executed, cause the one or more processors to determine a number of values in the first UEC that match a number of values in a defined UEC when determining the disambiguation confidence.

14. The computer readable medium of claim 13 , wherein the instructions, when executed, cause the one or more processors to identify the media source as being mapped to the first UEC when identifying the media source.

15. A method to perform source classification using high definition multimedia interface (HDMI) audio metadata, the method comprising:

extracting values of audio encoding parameters from HDMI metadata obtained from a monitored HDMI port of a media device, the HDMI metadata corresponding to media being output from the monitored HDMI port;

mapping the extracted values of the audio encoding parameters to a first unique encoding class (UEC) in a set of defined UECs, different ones of the set of defined UECs corresponding to different combinations of possible values of the audio encoding parameters capable of being included in the HDMI metadata; and

identifying a media source corresponding to the media output from the HDMI port based on one or more possible media sources mapped to the first UEC.

16. The method of claim 15 , wherein the HDMI metadata is included in an audio stream output from the monitored HDMI port of the media device, the audio stream includes transport parameters and licensed encoded audio data.

17. The method of claim 16 , wherein the extracted values correspond to the transport parameters.

18. The method of claim 15 , wherein the mapping of the extracted values of the audio encoding parameters to the first UEC includes determining a disambiguation confidence associated with the first UEC.

19. The method of claim 18 , wherein the determining of the disambiguation confidence includes determining a number of values in the first UEC that match a number of values in a defined UEC.

20. The method of claim 19 , wherein the identifying of the media source includes identifying the media source as being mapped to the first UEC.