Struct libvda::decode::session::Session

pub struct Session {
    connection: Rc<VdaConnection>,
    pipe: File,
    session_ptr: *mut vda_session_info,
}

Represents a decode session.

Fields

connection: Rc<VdaConnection>

pipe: File

session_ptr: *mut vda_session_info

Implementations

impl Session

pub(super) fn new(
    connection: &Rc<VdaConnection>,
    profile: Profile
) -> Option<Self>

Creates a new Session.

pub fn pipe(&self) -> &File

Gets a reference of pipe that notifies events from VDA session.

pub fn read_event(&mut self) -> Result<Event>

Reads an Event object from a pipe provided a decode session.

pub fn decode(
    &self,
    bitstream_id: i32,
    fd: BufferFd,
    offset: u32,
    bytes_used: u32
) -> Result<()>

Sends a decode request for a bitstream buffer given as fd.

fd will be closed by Chrome after decoding has occurred.

pub fn set_output_buffer_count(&self, num_output_buffers: usize) -> Result<()>

Sets the number of expected output buffers.

This function must be called after Event::ProvidePictureBuffers are notified. After calling this function, user_output_buffer must be called num_output_buffers times.

pub fn use_output_buffer(
    &self,
    picture_buffer_id: i32,
    format: PixelFormat,
    output_buffer: BufferFd,
    planes: &[FramePlane],
    modifier: u64
) -> Result<()>

Provides an output buffer that will be filled with decoded frames.

Users calls this function after set_output_buffer_count. Then, libvda will fill next frames in the buffer and noitify Event::PictureReady.

This function is also used to notify that they consumed decoded frames in the output buffer.

This function takes ownership of output_buffer.

pub fn reuse_output_buffer(&self, picture_buffer_id: i32) -> Result<()>

Returns an output buffer for reuse.

picture_buffer_id must be a value for which use_output_buffer has been called already.

pub fn flush(&self) -> Result<()>

Flushes the decode session.

When this operation has completed, Event::FlushResponse will be notified.

pub fn reset(&self) -> Result<()>

Resets the decode session.

When this operation has completed, Event::ResetResponse will be notified.

Trait Implementations

impl Drop for Session

fn drop(&mut self)

Executes the destructor for this type.