Content rules engines for audio playback devices

1. A method comprising:

receiving, via a media playback system comprising one or more playback devices and one or more remote computing devices, a command for one or more of the playback devices to play back first audio content;

in response to the command, playing back, via one or more of the playback devices, the first audio content;

receiving, via the media playback system, (i) second audio content to be played back by one or more of the playback devices and (ii) content source properties associated with an audio source of the second audio content;

accessing a rules engine to determine playback restrictions based on the content source properties, wherein the accessing comprises receiving, via at least one of the playback devices, state information corresponding to the playback restrictions from the one or more remote computing devices; and

based at least in part on the determination of the playback restrictions, restricting, via the media playback system, operation of the one or more playback devices.

2. The method of claim 1 , further comprising maintaining a state table and updating the state table based on the state information.

3. The method of claim 2 , further comprising (i) determining that at least one playback device is no longer receiving audio content from the audio content source and (ii) updating the state table to remove the playback restrictions from the at least one playback device.

4. The method of claim 3 , wherein the maintaining comprises associating limitations to the media playback system for a given content source that is to provide audio content for playback, wherein the limitations comprise at least one of (i) a maximum number of playback devices that may be grouped for the given content source and (ii) an indication of whether playback devices may be paired to one another for the given content source.

5. The method of claim 1 , wherein the content source properties comprise at least one of: input source, input type, encoding format, bitrate, user-specific tags, or any combination thereof.

6. The method of claim 5 , wherein the content source properties comprise an input type including one or more of: virtual reality (VR) home theatre or live audio.

7. The method of claim 1 , wherein the accessing is performed after the receiving, via the media playback system, the second audio content and the content source properties.

8. A playback device comprising:

a speaker;

one or more processors; and

a computer-readable medium storing instructions that, when executed by the one or more processors, cause the one or more processors to perform the following operations:

receiving, via a media playback system comprising the playback device and one or more remote computing devices, a command for one or more playback devices of the media playback system to play back first audio content;

in response to the command, playing back, via one or more playback devices, the first audio content;

receiving, via the media playback system, (i) second audio content to be played back by one or more of the playback devices and (ii) content source properties associated with an audio source of the second audio content;

accessing a rules engine to determine playback restrictions based on the content source properties, wherein the accessing comprises receiving, via at least one of the playback devices, state information corresponding to the playback restrictions from the one or more remote computing devices; and

based at least in part on the determination of the playback restrictions, restricting, via the media playback system, operation of the one or more playback devices.

9. The device of claim 8 , wherein the operations further comprise maintaining a state table and updating the state table based on the state information.

10. The device of claim 9 , wherein the operations further comprise (i) determining that at least one playback device is no longer receiving audio content from the audio content source and (ii) updating the state table to remove the playback restrictions from the at least one playback device.

11. The device of claim 10 , wherein the maintaining comprises associating limitations to the media playback system for a given content source that is to provide audio content for playback, wherein the limitations comprise at least one of (i) a maximum number of playback devices that may be grouped for the given content source and (ii) an indication of whether playback devices may be paired to one another for the given content source.

12. The device of claim 8 , wherein the content source properties comprise at least one of: input source, input type, encoding format, bitrate, user-specific tags, or any combination thereof.

13. The device of claim 12 , wherein the content source properties comprise an input type including one or more of: virtual reality (VR) home theatre or live audio.

14. The device of claim 8 , wherein the accessing is performed after the receiving, via the media playback system, the second audio content and the content source properties.

15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors, cause the one or more processors to perform the following operations:

receiving, via a media playback system comprising one or more playback devices and one or more remote computing devices, a command for one or more of the playback devices to play back first audio content;

in response to the command, playing back, via one or more playback devices, the first audio content;

receiving, via the media playback system, (i) second audio content to be played back by one or more of the playback devices and (ii) content source properties associated with an audio source of the second audio content;

accessing a rules engine to determine playback restrictions based on the content source properties, wherein the accessing comprises receiving, via at least one of the playback devices, state information corresponding to the playback restrictions from the one or more remote computing devices; and

based at least in part on the determination of the playback restrictions, restricting, via the media playback system, operation of the one or more playback devices.

16. The computer-readable medium of claim 15 , wherein the operations further comprise maintaining a state table and updating the state table based on the state information.

17. The computer-readable medium of claim 16 , wherein the operations further comprise (i) determining that at least one playback device is no longer receiving audio content from the audio content source and (ii) updating the state table to remove the playback restrictions from the at least one playback device.

18. The computer-readable medium of claim 17 , wherein the maintaining comprises associating limitations to the media playback system for a given content source that is to provide audio content for playback, wherein the limitations comprise at least one of (i) a maximum number of playback devices that may be grouped for the given content source and (ii) an indication of whether playback devices may be paired to one another for the given content source.

19. The computer-readable medium of claim 15 , wherein the content source properties comprise at least one of: input source, input type, encoding format, bitrate, user-specific tags, or any combination thereof.

20. The computer-readable medium of claim 19 , wherein the content source properties comprise an input type including one or more of: virtual reality (VR) home theatre or live audio.