Controlling audio output

1. An apparatus comprising:

at least one processor; and

at least one memory including computer program code,

the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least the following:

provide a first and a second audio components for output to first and second audio transducers of a wearable device;

determine a proximity between the apparatus or the wearable device and a third audio transducer external to the wearable device;

determine a first or second state of the first and second audio transducers; and

control output of at least one of the first and second audio components based on the determined proximity and the state of the first and second audio transducers,

wherein, responsive to the apparatus or the wearable device being determined as proximate to the third audio transducer, and the state of one of said first and second audio transducers being in the second state whilst the other of said first and second audio transducers is in the first state, the apparatus being caused to control output by being configured to cause output of the audio component associated with the audio transducer in the second state to be transferred to the third audio transducer whilst continuing to output the audio component associated with the audio transducer in the first state to said audio transducer in the first state.

2. The apparatus of claim 1 , wherein the first and second audio transducers respectively comprise first and second earphones and wherein the apparatus is caused to determine the first or second state of said first and second audio transducers by being configured to determine either an on-ear state as the first state or an off-ear state as the second state for the first and second earphones.

3. The apparatus of claim 1 , wherein the apparatus is caused to determine the first or second state of said first and second audio transducers by being configured to determine a respective battery charge level associated with each of the first and second audio transducers, wherein a battery charge level at or above a predetermined threshold corresponds to the first state and a battery charge level below the predetermined threshold corresponds to the second state.

4. The apparatus of claim 1 , wherein, responsive to the determined proximity of the apparatus or the wearable device crossing a proximity threshold value from being proximate to the third audio transducer to not being proximate, the apparatus is further configured to issue an audible notification to the audio transducer in the first state.

5. The apparatus of claim 4 , further caused to, subsequent to issuing the audible notification, receive a user input or gesture for enabling output of the audio component that was being output to the third audio transducer to be transferred to the audio transducer in the first state.

6. The apparatus of claim 1 , further caused to; determine that the third audio transducer supports stereo or spatial audio output, and wherein, if a third audio component is provided to the second state audio transducer for output with the respective first or second audio component in a spatialized form, the apparatus is caused to control output by being configured to transfer said spatialized audio components for stereo or spatial output at the third audio transducer.

7. The apparatus of claim 1 , further caused to:

determine that the apparatus or the wearable device is proximate to a fourth audio transducer, different from the third audio transducer and external to the wearable device, and that the audio transducer in the first state has changed to the second state; and

responsive to said determination, the apparatus is caused to control output by being configured to cause output of the audio component associated with the audio transducer in the second state to be transferred to said fourth audio transducer.

8. The apparatus of claim 1 , wherein, responsive to the apparatus or the wearable device being determined as proximate to the third audio transducer, and both of said first and second audio transducers being in the second state, the apparatus is caused to control output by being configured to cause output of both the first and second audio components to be transferred to the third audio transducer.

9. The apparatus of claim 1 , wherein, responsive to the apparatus or the wearable device being determined as not being proximate to the third audio transducer, and the state of one of said first and second audio transducers is in the second state whilst the other of said first and second audio transducers is in the first state, the apparatus is caused to control output by being configured to cause the audio component associated with the audio transducer in the second state to be transferred to the other, audio transducer in the first state with the current output of said audio transducer in the first state.

10. The apparatus of claim 9 , wherein the apparatus is caused to control output by being further configured to generate a monaural mix of the first and second audio components for output to said audio transducer in the first state.

11. The apparatus of claim 1 , wherein one of the audio components corresponds to a voice call or communications session.

12. The apparatus of claim 11 , wherein, responsive to the apparatus or the wearable device being determined as not proximate to the third audio transducer, and the state of both of said first and second audio transducers being in the second state, the apparatus is caused to control output by being configured to terminate the voice call or communications session.

13. The apparatus of claim 1 , wherein the apparatus is caused to determine the proximity of the apparatus or the wearable device to the third audio transducer by being configured to determine receipt of an audible test signal issued by the third audio transducer using a microphone associated with the wearable device.

14. The apparatus of claim 1 , being a mobile telecommunications apparatus.

15. A method, comprising:

providing a first and a second audio components for output to respective first and second audio transducers of a wearable device;

determining a proximity between an apparatus or the wearable device and a third audio transducer external to the wearable device;

determining a first or second state of the first and second audio transducers; and

controlling output of at least one of the first and second audio components based on the determined proximity and the state of the first and second audio transducers,

wherein, responsive to the apparatus or the wearable device being determined as proximate to the third audio transducer, and the state of one of said first and second audio transducers being in the second state whilst the other of said first and second audio transducers is in the first state, causing output of the audio component associated with the audio transducer in the second state to be transferred to the third audio transducer whilst continuing to output the audio component associated with the audio transducer in the first state to said audio transducer in the first state.

16. The method of claim 15 , wherein the first and second audio transducers respectively comprise first and second earphones and wherein determining the first or second state of said first and second audio transducers is configured to determine either an on-ear state as the first state or an off-ear state as the second state for the first and second earphones.

17. The method of claim 15 , wherein the determining the first or second state of said first and second audio transducers is configured to determine a respective battery charge level associated with each of the first and second audio transducers, wherein a battery charge level at or above a predetermined threshold corresponds to the first state and a battery charge level below the predetermined threshold corresponds to the second state.

18. The method of claim 15 , wherein, responsive to the determined proximity of the apparatus or the wearable device crossing a proximity threshold value from being proximate to the third audio transducer to not being proximate, the method further comprising issuing an audible notification to the audio transducer in the first state.

19. The method of claim 18 , further comprising, subsequent to issuing the audible notification, receiving a user input or gesture for enabling output of the audio component that was being output to the third audio transducer to be transferred to the audio transducer in the first state.

20. A non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following:

providing a first and a second audio components for output to respective first and second audio transducers of a wearable device;

determining a proximity between an apparatus or the wearable device and a third audio transducer external to the wearable device;

determining a first or second state of the first and second audio transducers; and

controlling output of at least one of the first and second audio components based on the determined proximity and the state of the first and second audio transducers,

wherein, responsive to the apparatus or the wearable device being determined as proximate to the third audio transducer, and the state of one of said first and second audio transducers being in the second state whilst the other of said first and second audio transducers is in the first state, causing output of the audio component associated with the audio transducer in the second state to be transferred to the third audio transducer whilst continuing to output the audio component associated with the audio transducer in the first state to said audio transducer in the first state.