gstreamer-rs/gstreamer-video/src/video_codec_state.rs

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2020-12-15 10:53:31 +00:00
// Take a look at the license at the top of the repository in the LICENSE file.
use crate::utils::HasStreamLock;
use glib::translate::*;
use std::fmt;
use std::marker::PhantomData;
use std::ptr;
use crate::video_info::VideoInfo;
pub trait VideoCodecStateContext<'a> {
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fn element(&self) -> Option<&'a dyn HasStreamLock>;
fn element_as_ptr(&self) -> *const gst::ffi::GstElement;
}
pub struct InNegotiation<'a> {
/* GstVideoCodecState API isn't safe so protect the state using the
* element (decoder or encoder) stream lock */
element: &'a dyn HasStreamLock,
}
pub struct Readable {}
impl<'a> VideoCodecStateContext<'a> for InNegotiation<'a> {
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fn element(&self) -> Option<&'a dyn HasStreamLock> {
Some(self.element)
}
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fn element_as_ptr(&self) -> *const gst::ffi::GstElement {
self.element.element_as_ptr()
}
}
impl<'a> VideoCodecStateContext<'a> for Readable {
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fn element(&self) -> Option<&'a dyn HasStreamLock> {
None
}
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fn element_as_ptr(&self) -> *const gst::ffi::GstElement {
ptr::null()
}
}
pub struct VideoCodecState<'a, T: VideoCodecStateContext<'a>> {
state: *mut ffi::GstVideoCodecState,
pub(crate) context: T,
phantom: PhantomData<&'a T>,
}
impl<'a, T: VideoCodecStateContext<'a>> fmt::Debug for VideoCodecState<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("VideoCodecState")
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.field("info", &self.info())
.field("caps", &self.caps())
.field("codec_data", &self.codec_data())
.field("allocation_caps", &self.allocation_caps())
.finish()
}
}
impl<'a> VideoCodecState<'a, Readable> {
// Take ownership of @state
pub(crate) unsafe fn new(state: *mut ffi::GstVideoCodecState) -> Self {
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skip_assert_initialized!();
Self {
state,
context: Readable {},
phantom: PhantomData,
}
}
}
impl<'a> VideoCodecState<'a, InNegotiation<'a>> {
// Take ownership of @state
pub(crate) unsafe fn new<T: HasStreamLock>(
state: *mut ffi::GstVideoCodecState,
element: &'a T,
) -> Self {
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skip_assert_initialized!();
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let stream_lock = element.stream_lock();
glib::ffi::g_rec_mutex_lock(stream_lock);
Self {
state,
context: InNegotiation { element },
phantom: PhantomData,
}
}
}
impl<'a, T: VideoCodecStateContext<'a>> VideoCodecState<'a, T> {
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pub fn info(&self) -> VideoInfo {
unsafe {
let ptr = &((*self.as_mut_ptr()).info) as *const _ as usize as *mut _;
VideoInfo::from_glib_none(ptr)
}
}
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pub fn caps(&self) -> Option<&gst::CapsRef> {
unsafe {
let ptr = (*self.as_mut_ptr()).caps;
if ptr.is_null() {
None
} else {
Some(gst::CapsRef::from_ptr(ptr))
}
}
}
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pub fn codec_data(&self) -> Option<&gst::BufferRef> {
unsafe {
let ptr = (*self.as_mut_ptr()).codec_data;
if ptr.is_null() {
None
} else {
Some(gst::BufferRef::from_ptr(ptr))
}
}
}
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pub fn allocation_caps(&self) -> Option<&gst::CapsRef> {
unsafe {
let ptr = (*self.as_mut_ptr()).allocation_caps;
if ptr.is_null() {
None
} else {
Some(gst::CapsRef::from_ptr(ptr))
}
}
}
#[doc(hidden)]
pub fn as_mut_ptr(&self) -> *mut ffi::GstVideoCodecState {
self.state
}
}
impl<'a, T: VideoCodecStateContext<'a>> Drop for VideoCodecState<'a, T> {
fn drop(&mut self) {
unsafe {
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if let Some(element) = self.context.element() {
let stream_lock = element.stream_lock();
glib::ffi::g_rec_mutex_unlock(stream_lock);
}
ffi::gst_video_codec_state_unref(self.state);
}
}
}
impl<'a> VideoCodecState<'a, InNegotiation<'a>> {
pub fn set_info(&mut self, info: VideoInfo) {
unsafe {
ptr::write(&mut (*self.as_mut_ptr()).info, *(info.to_glib_none().0));
}
}
pub fn set_caps(&mut self, caps: &gst::Caps) {
unsafe {
let prev = (*self.as_mut_ptr()).caps;
if !prev.is_null() {
gst::ffi::gst_mini_object_unref(prev as *mut gst::ffi::GstMiniObject)
}
ptr::write(
&mut (*self.as_mut_ptr()).caps,
gst::ffi::gst_mini_object_ref(caps.as_mut_ptr() as *mut _) as *mut _,
);
}
}
pub fn set_codec_data(&mut self, codec_data: &gst::Buffer) {
unsafe {
let prev = (*self.as_mut_ptr()).codec_data;
if !prev.is_null() {
gst::ffi::gst_mini_object_unref(prev as *mut gst::ffi::GstMiniObject)
}
ptr::write(
&mut (*self.as_mut_ptr()).codec_data,
gst::ffi::gst_mini_object_ref(codec_data.as_mut_ptr() as *mut _) as *mut _,
);
}
}
pub fn set_allocation_caps(&mut self, allocation_caps: &gst::Caps) {
unsafe {
let prev = (*self.as_mut_ptr()).allocation_caps;
if !prev.is_null() {
gst::ffi::gst_mini_object_unref(prev as *mut gst::ffi::GstMiniObject)
}
ptr::write(
&mut (*self.as_mut_ptr()).allocation_caps,
gst::ffi::gst_mini_object_ref(allocation_caps.as_mut_ptr() as *mut _) as *mut _,
);
}
}
}
impl<'a> Clone for VideoCodecState<'a, Readable> {
fn clone(&self) -> Self {
unsafe {
let state = ffi::gst_video_codec_state_ref(self.state);
Self::new(state)
}
}
}
unsafe impl<'a> Send for VideoCodecState<'a, Readable> {}
unsafe impl<'a> Sync for VideoCodecState<'a, Readable> {}