Struct libpulse_binding::format::Info

pub struct Info { /* private fields */ }

Represents the format of data provided in a stream or processed by a sink.

Implementations

impl Info

pub fn new() -> Option<Self>

Allocates a new Info structure.

Clients must initialise at least the encoding field themselves. Returns None on failure.

pub fn new_from_string(s: &str) -> Option<Self>

Parses a human-readable string of the form generated by print() into an Info structure.

Returns None on failure.

pub fn new_from_sample_spec(ss: &Spec, map: Option<&Map>) -> Option<Self>

Utility function to take a Spec and generate the corresponding Info.

Note that if you want the server to choose some of the stream parameters, for example the sample rate, so that they match the device parameters, then you shouldn’t use this function. In order to allow the server to choose a parameter value, that parameter must be left unspecified in the Info object, and this function always specifies all parameters. An exception is the channel map: if you pass None for the channel map, then the channel map will be left unspecified, allowing the server to choose it.

Returns None on failure.

pub fn is_valid(&self) -> bool

Checks whether the Info structure is valid.

pub fn is_pcm(&self) -> bool

Checks whether the Info structure represents a PCM (i.e. uncompressed data) format.

pub fn is_compatible_with(&self, with: &Self) -> bool

Checks whether the format represented by self is a subset of the format represented by with.

This means that with must have all the fields that self does, but the reverse need not be true. This is typically expected to be used to check if a stream’s format is compatible with a given sink. In such a case, self would be the sink’s format and with would be the streams.

pub fn print(&self) -> String

Gets a human-readable string representing the given format.

pub fn to_sample_spec(&self, ss: &mut Spec, map: &mut Map) -> Result<(), PAErr>

Utility function to generate a Spec and Map corresponding to a given Info.

The conversion for PCM formats is straight-forward. For non-PCM formats, if there is a fixed size-time conversion (i.e. all IEC61937-encapsulated formats), a “fake” sample spec whose size-time conversion corresponds to this format is provided and the channel map argument is ignored. For formats with variable size-time conversion, this function will fail.

pub fn get_encoding(&self) -> Encoding

Gets the encoding.

pub fn set_encoding(&mut self, encoding: Encoding)

Sets the encoding attribute.

pub fn get_properties(&self) -> &Proplist

Gets an immutable reference to the property list.

pub fn get_properties_mut(&mut self) -> &mut Proplist

Gets a mutable reference to the property list.

pub fn get_prop_type(&self, key: &str) -> PropType

Gets the type of property key.

pub fn get_prop_int(&self, key: &str) -> Result<i32, PAErr>

Gets an integer property.

pub fn get_prop_int_range(&self, key: &str) -> Result<(i32, i32), PAErr>

Gets an integer range property. On success, returns min-max tuple.

pub fn get_prop_int_array(&self, key: &str) -> Option<Vec<i32>>

Gets an integer array property.

Returns None on error.

pub fn get_prop_string(&self, key: &str) -> Option<String>

Gets a string property.

pub fn get_prop_string_array(&self, key: &str) -> Option<Vec<String>>

Gets a string array property.

pub fn get_sample_format(&self) -> Result<Format, PAErr>

This is supported on crate feature pa_v13 only.

Gets the sample format stored in the format info.

Returns Err if the sample format property is not set at all, or is invalid.

pub fn get_rate(&self) -> Result<u32, PAErr>

This is supported on crate feature pa_v13 only.

Gets the sample rate stored in the format info.

Returns Err if the sample rate property is not set at all, or is invalid.

pub fn get_channel_count(&self) -> Result<u8, PAErr>

This is supported on crate feature pa_v13 only.

Gets the channel count stored in the format info.

Returns Err if the channels property is not set at all, or is invalid.

pub fn get_channel_map(&self) -> Result<Map, PAErr>

This is supported on crate feature pa_v13 only.

Gets the channel map stored in the format info.

Returns Err if the channel map property is not set at all, or if the string form it is stored in within the property set fails to parse successfully.

pub fn set_prop_int(&mut self, key: &str, value: i32)

Sets an integer property.

pub fn set_prop_int_array(&mut self, key: &str, values: &[i32])

Sets a property with a list of integer values.

pub fn set_prop_int_range(&mut self, key: &str, min: i32, max: i32)

Sets a property which can have any value in a given integer range.

pub fn set_prop_string(&mut self, key: &str, value: &str)

Sets a string property.

pub fn set_prop_string_array(&mut self, key: &str, values: &[&str])

Sets a property with a list of string values.

pub fn set_sample_format(&mut self, sf: Format)

Convenience method to set the sample format as a property.

Note for PCM: If the sample format is left unspecified in the Info object, then the server will select the stream sample format. In that case the stream sample format will most likely match the device sample format, meaning that sample format conversion will be avoided.

pub fn set_rate(&mut self, rate: i32)

Convenience method to set the sampling rate as a property.

Note for PCM: If the sample rate is left unspecified in the Info object, then the server will select the stream sample rate. In that case the stream sample rate will most likely match the device sample rate, meaning that sample rate conversion will be avoided.

pub fn set_channels(&mut self, channels: u32)

Convenience method to set the number of channels as a property.

Note for PCM: If the channel count is left unspecified in the Info object, then the server will select the stream channel count. In that case the stream channel count will most likely match the device channel count, meaning that up/downmixing will be avoided.

pub fn set_channel_map(&mut self, map: &Map)

Convenience method to set the channel map as a property.

Note for PCM: If the channel map is left unspecified in the Info object, then the server will select the stream channel map. In that case the stream channel map will most likely match the device channel map, meaning that remixing will be avoided.

Trait Implementations

impl Clone for Info

fn clone(&self) -> Self

Returns a new Info struct and representing the same format. If this is called on a ‘weak’ instance, a non-weak object is returned.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Info

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for Info

fn drop(&mut self)

Executes the destructor for this type.

impl Send for Info

impl Sync for Info