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audio_hw_device Struct Reference
#include <
audio.h
>
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struct
hw_device_t
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common
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uint32_t(*
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get_supported_devices
)(const struct
audio_hw_device
*dev)
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int(*
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init_check
)(const struct
audio_hw_device
*dev)
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int(*
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set_voice_volume
)(struct
audio_hw_device
*dev, float volume)
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int(*
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set_master_volume
)(struct
audio_hw_device
*dev, float volume)
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int(*
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get_master_volume
)(struct
audio_hw_device
*dev, float *volume)
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int(*
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set_mode
)(struct
audio_hw_device
*dev, audio_mode_t mode)
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int(*
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set_mic_mute
)(struct
audio_hw_device
*dev, bool state)
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int(*
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get_mic_mute
)(const struct
audio_hw_device
*dev, bool *state)
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int(*
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set_parameters
)(struct
audio_hw_device
*dev, const char *kv_pairs)
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char *(*
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get_parameters
)(const struct
audio_hw_device
*dev, const char *keys)
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size_t(*
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get_input_buffer_size
)(const struct
audio_hw_device
*dev, const struct audio_config *config)
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int(*
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open_output_stream
)(struct
audio_hw_device
*dev, audio_io_handle_t handle, audio_devices_t devices, audio_output_flags_t flags, struct audio_config *config, struct
audio_stream_out
**stream_out, const char *address)
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void(*
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close_output_stream
)(struct
audio_hw_device
*dev, struct
audio_stream_out
*stream_out)
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int(*
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open_input_stream
)(struct
audio_hw_device
*dev, audio_io_handle_t handle, audio_devices_t devices, struct audio_config *config, struct
audio_stream_in
**stream_in, audio_input_flags_t flags, const char *address, audio_source_t source)
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void(*
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close_input_stream
)(struct
audio_hw_device
*dev, struct
audio_stream_in
*stream_in)
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int(*
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dump
)(const struct
audio_hw_device
*dev, int fd)
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int(*
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set_master_mute
)(struct
audio_hw_device
*dev, bool mute)
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int(*
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get_master_mute
)(struct
audio_hw_device
*dev, bool *mute)
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int(*
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create_audio_patch
)(struct
audio_hw_device
*dev, unsigned int num_sources, const struct audio_port_config *sources, unsigned int num_sinks, const struct audio_port_config *sinks, audio_patch_handle_t *handle)
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int(*
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release_audio_patch
)(struct
audio_hw_device
*dev, audio_patch_handle_t handle)
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int(*
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get_audio_port
)(struct
audio_hw_device
*dev, struct audio_port *port)
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int(*
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set_audio_port_config
)(struct
audio_hw_device
*dev, const struct audio_port_config *config)
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Definition at line
516
of file
audio.h
.
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int(* create_audio_patch)(struct
audio_hw_device
*dev, unsigned int num_sources, const struct audio_port_config *sources, unsigned int num_sinks, const struct audio_port_config *sinks, audio_patch_handle_t *handle)
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Routing control
Definition at line
648
of file
audio.h
.
This method dumps the state of the audio hardware
Definition at line
624
of file
audio.h
.
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int(* get_audio_port)(struct
audio_hw_device
*dev, struct audio_port *port)
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size_t(* get_input_buffer_size)(const struct
audio_hw_device
*dev, const struct audio_config *config)
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Get the current master mute status for the HAL, if the HAL supports master mute control. AudioFlinger will query this value from the primary audio HAL when the service starts and use the value for setting the initial master mute across all HALs. HALs which do not support this method may leave it set to NULL.
Definition at line
639
of file
audio.h
.
Get the current master volume value for the HAL, if the HAL supports master volume control. AudioFlinger will query this value from the primary audio HAL when the service starts and use the value for setting the initial master volume across all HALs. HALs which do not support this method may leave it set to NULL.
Definition at line
561
of file
audio.h
.
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char*(* get_parameters)(const struct
audio_hw_device
*dev, const char *keys)
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used by audio flinger to enumerate what devices are supported by each
audio_hw_device
implementation.
Return value is a bitmask of 1 or more values of audio_devices_t
NOTE: audio HAL implementations starting with AUDIO_DEVICE_API_VERSION_2_0 do not implement this function. All supported devices should be listed in audio_policy.conf file and the audio policy manager must choose the appropriate audio module based on information in this file.
Definition at line
536
of file
audio.h
.
check to see if the audio hardware interface has been initialized. returns 0 on success, -ENODEV on failure.
Definition at line
542
of file
audio.h
.
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int(* open_input_stream)(struct
audio_hw_device
*dev, audio_io_handle_t handle, audio_devices_t devices, struct audio_config *config, struct
audio_stream_in
**stream_in, audio_input_flags_t flags, const char *address, audio_source_t source)
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This method creates and opens the audio hardware input stream
Definition at line
611
of file
audio.h
.
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int(* open_output_stream)(struct
audio_hw_device
*dev, audio_io_handle_t handle, audio_devices_t devices, audio_output_flags_t flags, struct audio_config *config, struct
audio_stream_out
**stream_out, const char *address)
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This method creates and opens the audio hardware output stream. The "address" parameter qualifies the "devices" audio device type if needed. The format format depends on the device type:
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Bluetooth devices use the MAC address of the device in the form "00:11:22:AA:BB:CC"
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USB devices use the ALSA card and device numbers in the form "card=X;device=Y"
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Other devices may use a number or any other string.
Definition at line
599
of file
audio.h
.
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int(* release_audio_patch)(struct
audio_hw_device
*dev, audio_patch_handle_t handle)
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int(* set_audio_port_config)(struct
audio_hw_device
*dev, const struct audio_port_config *config)
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set the audio mute status for all audio activities. If any value other than 0 is returned, the software mixer will emulate this capability.
Definition at line
630
of file
audio.h
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set the audio volume for all audio activities other than voice call. Range between 0.0 and 1.0. If any value other than 0 is returned, the software mixer will emulate this capability.
Definition at line
552
of file
audio.h
.
set_mode is called when the audio mode changes. AUDIO_MODE_NORMAL mode is for standard audio playback, AUDIO_MODE_RINGTONE when a ringtone is playing, and AUDIO_MODE_IN_CALL when a call is in progress.
Definition at line
568
of file
audio.h
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set the audio volume of a voice call. Range is between 0.0 and 1.0
Definition at line
545
of file
audio.h
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The documentation for this struct was generated from the following file:
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hardware/libhardware/include/hardware/
audio.h
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2019-10-02 UTC.
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