Broadcast message-based conference audio synchronization

1. A method, comprising:

receiving, by a device connected to a conference, broadcast messages from other devices;

selecting, by the device, at least a subset of the broadcast messages, wherein each broadcast message in the subset includes an indication that a respective device transmitting the each broadcast message is connected to the conference;

extracting, by the device, respective audio synchronization values from the broadcast messages in the subset;

identifying, by the device and based on the respective audio synchronization values, an audio frame of an audio stream of the conference; and

outputting, by the device, the audio frame.

2. The method of claim 1 , wherein the indication is a conference identifier.

3. The method of claim 1 , further comprising:

transmitting, by the device, a self-clock beacon including an audio frame number corresponding to the audio frame being played by the device.

4. The method of claim 1 , wherein selecting the subset of the broadcast messages received from other devices comprises:

filtering the broadcast messages based on the indication.

5. The method of claim 1 , wherein identifying, by the device and based on the respective audio synchronization values, the audio frame of the audio stream of the conference comprises:

determining a time-to-play for the audio frame based on the respective audio synchronization values.

6. The method of claim 1 , wherein the device and at least one of the other devices are located within a same physical location.

7. The method of claim 1 , wherein the broadcast messages are received over a first network that is different from a second network used for receiving the audio stream.

8. A device, comprising:

a memory; and

a processor, the processor configured to execute instructions stored in the memory to:

receive broadcast messages from other devices, wherein the device is connected to a conference;

select at least a subset of the broadcast messages, wherein each broadcast message in the subset includes an indication that a respective device transmitting the each broadcast message is connected to the conference;

extract respective audio synchronization values from the broadcast messages in the sub set;

identify, based on the respective audio synchronization values, an audio frame of an audio stream of the conference; and

output the audio frame.

9. The device of claim 8 , wherein the processor is further configured to execute instructions stored in the memory to:

determine a master timing clock from amongst a self-clock and the respective audio synchronization values.

10. The device of claim 8 ,

wherein the audio stream is received over a first network, and

wherein the broadcast messages are received over a second network that is different from the first network.

11. The device of claim 8 , wherein the broadcast messages are received over a Bluetooth Low Energy (BLE) network.

12. The device of claim 8 , wherein the processor is further configured to execute instructions stored in the memory to:

transmit, using a one-way communication protocol, a broadcast message that includes an audio synchronization value of the device.

13. The device of claim 8 , further comprising:

a transceiver configured to transmit and receive Bluetooth Low Energy (BLE) beacon packets.

14. The device of claim 8 , wherein the processor is configured to determine a master timing clock from the respective audio synchronization values.

15. The device of claim 8 , wherein the indication comprises a unique conference identifier of the conference.

16. A non-transitory computer-readable storage medium storing instructions operable to cause one or more processors to perform operations comprising, comprising:

receiving, by a device connected to a conference, broadcast messages from other devices;

selecting at least a subset of the broadcast messages, wherein each broadcast message in the subset includes an indication that a respective device transmitting the each broadcast message is connected to the conference;

extracting, by the device, respective audio synchronization values from the broadcast messages in the subset;

identifying, by the device and based on the respective audio synchronization values, an audio frame of an audio stream of the conference; and

outputting, by the device, the audio frame.

17. The non-transitory computer-readable storage medium of claim 16 , wherein outputting, at the device, the audio frame of the audio stream comprises:

adjusting a timing for outputting the audio frame based on the respective audio synchronization values.

18. The non-transitory computer-readable storage medium of claim 16 , wherein the operations further comprise:

transmitting a device self-clock as part of the broadcast messages for use by at least some of the other devices in synchronizing audio playback of the audio stream.

19. The non-transitory computer-readable storage medium of claim 16 , wherein the broadcast messages and the audio stream are received over different networks using different network protocols.

20. The non-transitory computer-readable storage medium of claim 16 , wherein the operations further comprise:

adjusting a playback buffer size based on the respective audio synchronization values.