codec: add several getters

src/codec/audio.rs

@@ -0,0 +1,136 @@
+use std::ops::Deref;
+use std::marker::PhantomData;
+
+use {ChannelLayout, format};
+use super::codec::Codec;
+use ffi::*;
+
+pub struct Audio<'a> {
+	codec: &'a Codec<'a>,
+}
+
+impl<'a> Audio<'a> {
+	pub unsafe fn new<'b>(codec: &'b Codec) -> Audio<'b> {
+		Audio {
+			codec: codec,
+		}
+	}
+}
+
+impl<'a> Audio<'a> {
+	pub fn rates(&self) -> RateIter {
+		unsafe {
+			RateIter::new((*self.codec.as_ptr()).supported_samplerates)
+		}
+	}
+
+	pub fn formats(&self) -> FormatIter {
+		unsafe {
+			FormatIter::new((*self.codec.as_ptr()).sample_fmts)
+		}
+	}
+
+	pub fn channel_layouts(&self) -> ChannelLayoutIter {
+		unsafe {
+			ChannelLayoutIter::new((*self.codec.as_ptr()).channel_layouts)
+		}
+	}
+}
+
+impl<'a> Deref for Audio<'a> {
+	type Target = Codec<'a>;
+
+	fn deref(&self) -> &Self::Target {
+		self.codec
+	}
+}
+
+pub struct RateIter<'a> {
+	ptr: *const i32,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> RateIter<'a> {
+	pub fn new(ptr: *const i32) -> Self {
+		RateIter { ptr: ptr, _marker: PhantomData }
+	}
+}
+
+impl<'a> Iterator for RateIter<'a> {
+	type Item = i32;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if !self.ptr.is_null() && (*self.ptr) != 0 {
+				let element = self.ptr;
+				self.ptr    = self.ptr.offset(1);
+
+				Some((*element))
+			}
+			else {
+				None
+			}
+		}
+	}
+}
+
+pub struct FormatIter<'a> {
+	ptr: *const AVSampleFormat,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> FormatIter<'a> {
+	pub fn new(ptr: *const AVSampleFormat) -> Self {
+		FormatIter { ptr: ptr, _marker: PhantomData }
+	}
+}
+
+impl<'a> Iterator for FormatIter<'a> {
+	type Item = format::Sample;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if !self.ptr.is_null() && (*self.ptr) != AVSampleFormat::AV_SAMPLE_FMT_NONE {
+				let element = self.ptr;
+				self.ptr    = self.ptr.offset(1);
+
+				Some((*element).into())
+			}
+			else {
+				None
+			}
+		}
+	}
+}
+
+pub struct ChannelLayoutIter<'a> {
+	ptr: *const u64,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> ChannelLayoutIter<'a> {
+	pub fn new(ptr: *const u64) -> Self {
+		ChannelLayoutIter { ptr: ptr, _marker: PhantomData }
+	}
+}
+
+impl<'a> Iterator for ChannelLayoutIter<'a> {
+	type Item = ChannelLayout;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if !self.ptr.is_null() && (*self.ptr) != 0 {
+				let element = self.ptr;
+				self.ptr    = self.ptr.offset(1);
+
+				Some(ChannelLayout::from_bits_truncate(*element))
+			}
+			else {
+				None
+			}
+		}
+	}
+}

src/codec/codec.rs

@@ -3,9 +3,8 @@ use std::ffi::CStr;
 use std::str::from_utf8_unchecked;
 
 use ffi::*;
-use super::{Id, Context};
-use ::media;
-use ::Error;
+use super::{Id, Context, Video, Audio};
+use ::{Error, media};
 use ::codec::context::Opened;
 
 pub struct Codec<'a> {
@@ -68,4 +67,36 @@ impl<'a> Codec<'a> {
 			Id::from((*self.as_ptr()).id)
 		}
 	}
+
+	pub fn video(&self) -> Result<Video, Error> {
+		unsafe {
+			if self.medium() == media::Type::Video {
+				Ok(Video::new(self))
+			}
+			else {
+				Err(Error::InvalidData)
+			}
+		}
+	}
+
+	pub fn audio(&self) -> Result<Audio, Error> {
+		unsafe {
+			if self.medium() == media::Type::Audio {
+				Ok(Audio::new(self))
+			}
+			else {
+				Err(Error::InvalidData)
+			}
+		}
+	}
+
+	// capabilities
+
+	pub fn max_lowres(&self) -> i32 {
+		unsafe {
+			av_codec_get_max_lowres(self.as_ptr())
+		}
+	}
+
+	// profiles
 }

src/codec/decoder/video.rs

@@ -149,3 +149,4 @@ impl DerefMut for Video {
 		&mut self.0
 	}
 }
+

src/codec/mod.rs

@@ -14,6 +14,12 @@ pub use self::context::Context;
 
 pub mod codec;
 
+pub mod video;
+pub use self::video::Video;
+
+pub mod audio;
+pub use self::audio::Audio;
+
 pub mod field_order;
 pub mod audio_service;
 

src/codec/video.rs

@@ -0,0 +1,99 @@
+use std::marker::PhantomData;
+use std::ops::Deref;
+
+use {Rational, format};
+use super::codec::Codec;
+use ffi::*;
+
+pub struct Video<'a> {
+	codec: &'a Codec<'a>,
+}
+
+impl<'a> Video<'a> {
+	pub unsafe fn new<'b>(codec: &'b Codec) -> Video<'b> {
+		Video {
+			codec: codec,
+		}
+	}
+}
+
+impl<'a> Video<'a> {
+	pub fn rates(&self) -> RateIter {
+		unsafe {
+			RateIter::new((*self.codec.as_ptr()).supported_framerates)
+		}
+	}
+
+	pub fn formats(&self) -> FormatIter {
+		unsafe {
+			FormatIter::new((*self.codec.as_ptr()).pix_fmts)
+		}
+	}
+}
+
+impl<'a> Deref for Video<'a> {
+	type Target = Codec<'a>;
+
+	fn deref(&self) -> &Self::Target {
+		self.codec
+	}
+}
+
+pub struct RateIter<'a> {
+	ptr: *const AVRational,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> RateIter<'a> {
+	pub fn new(ptr: *const AVRational) -> Self {
+		RateIter { ptr: ptr, _marker: PhantomData }
+	}
+}
+
+impl<'a> Iterator for RateIter<'a> {
+	type Item = Rational;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if !self.ptr.is_null() && (*self.ptr) != (AVRational { num: 0, den: 0 }) {
+				let element = self.ptr;
+				self.ptr    = self.ptr.offset(1);
+
+				Some(Rational::from(*element))
+			} else {
+				None
+			}
+		}
+	}
+}
+
+pub struct FormatIter<'a> {
+	ptr: *const AVPixelFormat,
+
+	_marker: PhantomData<&'a ()>,
+}
+
+impl<'a> FormatIter<'a> {
+	pub fn new(ptr: *const AVPixelFormat) -> Self {
+		FormatIter { ptr: ptr, _marker: PhantomData }
+	}
+}
+
+impl<'a> Iterator for FormatIter<'a> {
+	type Item = format::Pixel;
+
+	fn next(&mut self) -> Option<<Self as Iterator>::Item> {
+		unsafe {
+			if !self.ptr.is_null() && (*self.ptr) != AVPixelFormat::AV_PIX_FMT_NONE {
+				let element = self.ptr;
+				self.ptr    = self.ptr.offset(1);
+
+				Some((*element).into())
+			}
+			else {
+				None
+			}
+		}
+	}
+}