diff options
Diffstat (limited to 'include/hardware/audio.h')
| -rw-r--r-- | include/hardware/audio.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/include/hardware/audio.h b/include/hardware/audio.h index adec3da8..a3b52146 100644 --- a/include/hardware/audio.h +++ b/include/hardware/audio.h @@ -247,6 +247,10 @@ typedef struct sink_metadata_v7 { struct record_track_metadata_v7* tracks; } sink_metadata_v7_t; +/** output stream callback method to indicate changes in supported latency modes */ +typedef void (*stream_latency_mode_callback_t)( + audio_latency_mode_t *modes, size_t num_modes, void *cookie); + /** * audio_stream_out is the abstraction interface for the audio output hardware. * @@ -533,7 +537,68 @@ struct audio_stream_out { */ int (*set_playback_rate_parameters)(struct audio_stream_out *stream, const audio_playback_rate_t *playbackRate); + + /** + * Indicates the requested latency mode for this output stream. + * + * The requested mode can be one of the modes returned by + * get_recommended_latency_modes(). + * + * Support for this method is optional but mandated on specific spatial audio + * streams indicated by AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed + * to a BT classic sink. + * + * \param[in] stream the stream object. + * \param[in] mode the requested latency mode. + * \return 0 in case of success. + * -EINVAL if the arguments are invalid + * -ENOSYS if the function is not available + */ + int (*set_latency_mode)(struct audio_stream_out *stream, audio_latency_mode_t mode); + + /** + * Indicates which latency modes are currently supported on this output stream. + * If the transport protocol (e.g Bluetooth A2DP) used by this output stream to reach + * the output device supports variable latency modes, the HAL indicates which + * modes are currently supported. + * The framework can then call setLatencyMode() with one of the supported modes to select + * the desired operation mode. + * + * Support for this method is optional but mandated on specific spatial audio + * streams indicated by AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed + * to a BT classic sink. + * + * \return 0 in case of success. + * -EINVAL if the arguments are invalid + * -ENOSYS if the function is not available + * \param[in] stream the stream object. + * \param[out] modes the supported latency modes. + * \param[in/out] num_modes as input the maximum number of modes to return, + * as output the actual number of modes returned. + */ + int (*get_recommended_latency_modes)(struct audio_stream_out *stream, + audio_latency_mode_t *modes, size_t *num_modes); + + /** + * Set the callback interface for notifying changes in supported latency modes. + * + * Calling this method with a null pointer will result in clearing a previously set callback. + * + * Support for this method is optional but mandated on specific spatial audio + * streams indicated by AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed + * to a BT classic sink. + * + * \param[in] stream the stream object. + * \param[in] callback the registered callback or null to unregister. + * \param[in] cookie the context to pass when calling the callback. + * \return 0 in case of success. + * -EINVAL if the arguments are invalid + * -ENOSYS if the function is not available + */ + int (*set_latency_mode_callback)(struct audio_stream_out *stream, + stream_latency_mode_callback_t callback, void *cookie); }; + typedef struct audio_stream_out audio_stream_out_t; struct audio_stream_in { |