gstreamer-rs/gstreamer-video/src/video_format_info.rs

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// Copyright (C) 2017 Sebastian Dröge <sebastian@centricular.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use ffi;
use std::ffi::CStr;
use std::fmt;
use std::str;
use glib;
use glib::translate::{from_glib, ToGlib};
pub struct VideoFormatInfo(&'static ffi::GstVideoFormatInfo);
impl VideoFormatInfo {
pub fn from_format(format: ::VideoFormat) -> VideoFormatInfo {
assert_initialized_main_thread!();
unsafe {
let info = ffi::gst_video_format_get_info(format.to_glib());
assert!(!info.is_null());
VideoFormatInfo(&*info)
}
}
pub fn format(&self) -> ::VideoFormat {
from_glib(self.0.format)
}
pub fn name<'a>(&self) -> &'a str {
unsafe { CStr::from_ptr(self.0.name).to_str().unwrap() }
}
pub fn description<'a>(&self) -> &'a str {
unsafe { CStr::from_ptr(self.0.description).to_str().unwrap() }
}
pub fn flags(&self) -> ::VideoFormatFlags {
from_glib(self.0.flags)
}
pub fn bits(&self) -> u32 {
self.0.bits
}
pub fn n_components(&self) -> u32 {
self.0.n_components
}
pub fn shift(&self) -> &[u32] {
&self.0.shift[0..(self.0.n_components as usize)]
}
pub fn depth(&self) -> &[u32] {
&self.0.depth[0..(self.0.n_components as usize)]
}
pub fn pixel_stride(&self) -> &[i32] {
&self.0.pixel_stride[0..(self.0.n_components as usize)]
}
pub fn n_planes(&self) -> u32 {
self.0.n_planes
}
pub fn plane(&self) -> &[u32] {
&self.0.plane[0..(self.0.n_components as usize)]
}
pub fn poffset(&self) -> &[u32] {
&self.0.poffset[0..(self.0.n_components as usize)]
}
pub fn w_sub(&self) -> &[u32] {
&self.0.w_sub[0..(self.0.n_components as usize)]
}
pub fn h_sub(&self) -> &[u32] {
&self.0.h_sub[0..(self.0.n_components as usize)]
}
pub fn tile_mode(&self) -> ::VideoTileMode {
from_glib(self.0.tile_mode)
}
pub fn tile_ws(&self) -> u32 {
self.0.tile_ws
}
pub fn tile_hs(&self) -> u32 {
self.0.tile_hs
}
pub fn unpack_format(&self) -> ::VideoFormat {
from_glib(self.0.unpack_format)
}
pub fn pack_lines(&self) -> i32 {
self.0.pack_lines
}
pub fn has_alpha(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_ALPHA)
}
pub fn has_palette(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_PALETTE)
}
pub fn is_complex(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_COMPLEX)
}
pub fn is_gray(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_GRAY)
}
pub fn is_le(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_LE)
}
pub fn is_rgb(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_RGB)
}
pub fn is_tiled(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_TILED)
}
pub fn is_yuv(&self) -> bool {
self.0.flags.contains(ffi::GST_VIDEO_FORMAT_FLAG_YUV)
}
pub fn scale_width(&self, component: u8, width: u32) -> u32 {
(-((-(width as i64)) >> self.w_sub()[component as usize])) as u32
}
pub fn scale_height(&self, component: u8, height: u32) -> u32 {
(-((-(height as i64)) >> self.h_sub()[component as usize])) as u32
}
// TODO: pack/unpack
}
unsafe impl Sync for VideoFormatInfo {}
unsafe impl Send for VideoFormatInfo {}
impl PartialEq for VideoFormatInfo {
fn eq(&self, other: &Self) -> bool {
self.format() == other.format()
}
}
impl Eq for VideoFormatInfo {}
impl fmt::Debug for VideoFormatInfo {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
f.write_str(self.name())
}
}
impl fmt::Display for VideoFormatInfo {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
f.write_str(self.name())
}
}
impl str::FromStr for ::VideoFormatInfo {
type Err = ();
fn from_str(s: &str) -> Result<Self, ()> {
skip_assert_initialized!();
let format = s.parse()?;
Ok(VideoFormatInfo::from_format(format))
}
}
impl From<::VideoFormat> for VideoFormatInfo {
fn from(f: ::VideoFormat) -> Self {
skip_assert_initialized!();
Self::from_format(f)
}
}
#[doc(hidden)]
impl glib::translate::GlibPtrDefault for VideoFormatInfo {
type GlibType = *mut ffi::GstVideoFormatInfo;
}
#[doc(hidden)]
impl<'a> glib::translate::ToGlibPtr<'a, *const ffi::GstVideoFormatInfo> for VideoFormatInfo {
type Storage = &'a VideoFormatInfo;
fn to_glib_none(&'a self) -> glib::translate::Stash<'a, *const ffi::GstVideoFormatInfo, Self> {
glib::translate::Stash(self.0, self)
}
fn to_glib_full(&self) -> *const ffi::GstVideoFormatInfo {
unimplemented!()
}
}
#[doc(hidden)]
impl glib::translate::FromGlibPtrNone<*mut ffi::GstVideoFormatInfo> for VideoFormatInfo {
#[inline]
unsafe fn from_glib_none(ptr: *mut ffi::GstVideoFormatInfo) -> Self {
VideoFormatInfo(&*ptr)
}
}
#[cfg(test)]
mod tests {
use super::*;
use gst;
#[test]
fn test_get() {
gst::init().unwrap();
let info = VideoFormatInfo::from_format(::VideoFormat::I420);
assert_eq!(info.name(), "I420");
let other_info = "I420".parse().unwrap();
assert_eq!(info, other_info);
assert_eq!(info.scale_width(0, 128), 128);
assert_eq!(info.scale_width(1, 128), 64);
assert_eq!(info.scale_width(2, 128), 64);
}
}