Kieran/ffmpeg-the-third
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codec: use Option<_> in the getter API

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This commit is contained in:
meh
2015-08-29 16:15:57 +02:00
parent b39d8df4ee
commit 8ed092c0c3
4 changed files with 147 additions and 69 deletions
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72
src/codec/audio.rs
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@ -18,21 +18,36 @@ impl<'a> Audio<'a> {
}
impl<'a> Audio<'a> {
pub fn rates(&self) -> RateIter {
pub fn rates(&self) -> Option<RateIter> {
unsafe {
RateIter::new((*self.codec.as_ptr()).supported_samplerates)
if (*self.as_ptr()).supported_samplerates.is_null() {
None
}
else {
Some(RateIter::new((*self.codec.as_ptr()).supported_samplerates))
}
}
}
pub fn formats(&self) -> FormatIter {
pub fn formats(&self) -> Option<FormatIter> {
unsafe {
FormatIter::new((*self.codec.as_ptr()).sample_fmts)
if (*self.codec.as_ptr()).sample_fmts.is_null() {
None
}
else {
Some(FormatIter::new((*self.codec.as_ptr()).sample_fmts))
}
}
}
pub fn channel_layouts(&self) -> ChannelLayoutIter {
pub fn channel_layouts(&self) -> Option<ChannelLayoutIter> {
unsafe {
ChannelLayoutIter::new((*self.codec.as_ptr()).channel_layouts)
if (*self.codec.as_ptr()).channel_layouts.is_null() {
None
}
else {
Some(ChannelLayoutIter::new((*self.codec.as_ptr()).channel_layouts))
}
}
}
}
@ -62,15 +77,14 @@ impl<'a> Iterator for RateIter<'a> {
fn next(&mut self) -> Option<<Self as Iterator>::Item> {
unsafe {
if !self.ptr.is_null() && (*self.ptr) != 0 {
let rate = *self.ptr;
self.ptr = self.ptr.offset(1);
if *self.ptr == 0 {
return None;
}
Some(rate)
}
else {
None
}
let rate = *self.ptr;
self.ptr = self.ptr.offset(1);
Some(rate)
}
}
}
@ -92,15 +106,14 @@ impl<'a> Iterator for FormatIter<'a> {
fn next(&mut self) -> Option<<Self as Iterator>::Item> {
unsafe {
if !self.ptr.is_null() && (*self.ptr) != AVSampleFormat::AV_SAMPLE_FMT_NONE {
let format = (*self.ptr).into();
self.ptr = self.ptr.offset(1);
if *self.ptr == AVSampleFormat::AV_SAMPLE_FMT_NONE {
return None;
}
Some(format)
}
else {
None
}
let format = (*self.ptr).into();
self.ptr = self.ptr.offset(1);
Some(format)
}
}
}
@ -122,15 +135,14 @@ impl<'a> Iterator for ChannelLayoutIter<'a> {
fn next(&mut self) -> Option<<Self as Iterator>::Item> {
unsafe {
if !self.ptr.is_null() && (*self.ptr) != 0 {
let chl = ChannelLayout::from_bits_truncate(*self.ptr);
self.ptr = self.ptr.offset(1);
if *self.ptr == 0 {
return None;
}
Some(chl)
}
else {
None
}
let layout = ChannelLayout::from_bits_truncate(*self.ptr);
self.ptr = self.ptr.offset(1);
Some(layout)
}
}
}