[−][src]Struct alsa::pcm::IO
Sample format dependent struct for reading from and writing data to a PCM
.
Also implements std::io::Read
and std::io::Write
.
Note: Only one IO object is allowed in scope at a time (for mmap safety).
Methods
impl<'a, S: Copy> IO<'a, S>
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pub fn writei(&self, buf: &[S]) -> Result<usize>
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On success, returns number of frames written. (Multiply with number of channels to get number of items in buf successfully written.)
pub fn readi(&self, buf: &mut [S]) -> Result<usize>
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On success, returns number of frames read. (Multiply with number of channels to get number of items in buf successfully read.)
pub fn mmap<F: FnOnce(&mut [S]) -> usize>(
&self,
frames: usize,
func: F
) -> Result<usize>
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&self,
frames: usize,
func: F
) -> Result<usize>
Wrapper around snd_pcm_mmap_begin and snd_pcm_mmap_commit.
You can read/write into the sound card's buffer during the call to the closure. According to alsa-lib docs, you should call avail_update before calling this function.
All calculations are in frames, i e, the closure should return number of frames processed. Also, there might not be as many frames to read/write as requested, and there can even be an empty buffer supplied to the closure.
Note: This function works only with interleaved access mode.
Trait Implementations
impl<'a, S: Copy> Drop for IO<'a, S>
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impl<'a, S: Copy> Write for IO<'a, S>
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fn write(&mut self, buf: &[u8]) -> Result<usize>
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fn flush(&mut self) -> Result<()>
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fn write_vectored(&mut self, bufs: &[IoSlice]) -> Result<usize, Error>
1.36.0[src]
Like write
, except that it writes from a slice of buffers. Read more
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
1.0.0[src]
Attempts to write an entire buffer into this writer. Read more
fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>
1.0.0[src]
Writes a formatted string into this writer, returning any error encountered. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0[src]
Creates a "by reference" adaptor for this instance of Write
. Read more
impl<'a, S: Copy> Read for IO<'a, S>
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fn read(&mut self, buf: &mut [u8]) -> Result<usize>
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fn read_vectored(&mut self, bufs: &mut [IoSliceMut]) -> Result<usize, Error>
1.36.0[src]
Like read
, except that it reads into a slice of buffers. Read more
unsafe fn initializer(&self) -> Initializer
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read_initializer
)Determines if this Read
er can work with buffers of uninitialized memory. Read more
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>
1.0.0[src]
Read all bytes until EOF in this source, placing them into buf
. Read more
fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>
1.0.0[src]
Read all bytes until EOF in this source, appending them to buf
. Read more
fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>
1.6.0[src]
Read the exact number of bytes required to fill buf
. Read more
fn by_ref(&mut self) -> &mut Self
1.0.0[src]
Creates a "by reference" adaptor for this instance of Read
. Read more
fn bytes(self) -> Bytes<Self>
1.0.0[src]
Transforms this Read
instance to an [Iterator
] over its bytes. Read more
fn chain<R>(self, next: R) -> Chain<Self, R> where
R: Read,
1.0.0[src]
R: Read,
Creates an adaptor which will chain this stream with another. Read more
fn take(self, limit: u64) -> Take<Self>
1.0.0[src]
Creates an adaptor which will read at most limit
bytes from it. Read more
Auto Trait Implementations
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,