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https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
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closedcaption: Convert bitfields to uint8_t for portability reasons
Contrary to what one might believe, this actually reduces the size of the structs due to alignment constraints. On Linux x86-64 clang/gcc it reduces the size of the caption_frame_t struct from 7760 bytes to 6800 bytes, on Windows x86-64 MSVC from 11600 bytes to 6800 bytes. It also causes simpler and potentially faster assembly to be generated as the values can be directly accessed as uint8_t instead of having to extract the corresponding bits with bitwise operations. It also gives us the same ABI with clang/gcc and MSVC.
This commit is contained in:
Sebastian Dröge
parent
70ef91fb4a
commit
f1e3212477
2 changed files with 10 additions and 188 deletions
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@ -56,8 +56,8 @@ static inline libcaption_stauts_t libcaption_status_update(libcaption_stauts_t o
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#define SCREEN_COLS 32
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typedef struct {
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unsigned int uln : 1; //< underline
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unsigned int sty : 3; //< style
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uint8_t uln; //< underline
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uint8_t sty; //< style
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utf8_char_t data[5]; //< 4 byte utf8 values plus null term
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} caption_frame_cell_t;
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@ -66,9 +66,9 @@ typedef struct {
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} caption_frame_buffer_t;
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typedef struct {
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unsigned int uln : 1; //< underline
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unsigned int sty : 3; //< style
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unsigned int rup : 2; //< roll-up line count minus 1
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uint8_t uln; //< underline
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uint8_t sty; //< style
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uint8_t rup; //< roll-up line count minus 1
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int8_t row, col;
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uint16_t cc_data;
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} caption_frame_state_t;
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@ -1,86 +1,5 @@
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/* automatically generated by rust-bindgen */
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#[repr(C)]
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#[derive(Copy, Clone, Debug, Default, Eq, Hash, Ord, PartialEq, PartialOrd)]
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pub struct __BindgenBitfieldUnit<Storage, Align> {
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storage: Storage,
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align: [Align; 0],
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}
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impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align> {
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#[inline]
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pub const fn new(storage: Storage) -> Self {
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Self { storage, align: [] }
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}
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}
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impl<Storage, Align> __BindgenBitfieldUnit<Storage, Align>
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where
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Storage: AsRef<[u8]> + AsMut<[u8]>,
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{
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#[inline]
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pub fn get_bit(&self, index: usize) -> bool {
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debug_assert!(index / 8 < self.storage.as_ref().len());
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let byte_index = index / 8;
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let byte = self.storage.as_ref()[byte_index];
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let bit_index = if cfg!(target_endian = "big") {
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7 - (index % 8)
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} else {
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index % 8
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};
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let mask = 1 << bit_index;
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byte & mask == mask
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}
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#[inline]
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pub fn set_bit(&mut self, index: usize, val: bool) {
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debug_assert!(index / 8 < self.storage.as_ref().len());
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let byte_index = index / 8;
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let byte = &mut self.storage.as_mut()[byte_index];
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let bit_index = if cfg!(target_endian = "big") {
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7 - (index % 8)
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} else {
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index % 8
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};
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let mask = 1 << bit_index;
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if val {
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*byte |= mask;
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} else {
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*byte &= !mask;
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}
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}
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#[inline]
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pub fn get(&self, bit_offset: usize, bit_width: u8) -> u64 {
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debug_assert!(bit_width <= 64);
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debug_assert!(bit_offset / 8 < self.storage.as_ref().len());
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debug_assert!((bit_offset + (bit_width as usize)) / 8 <= self.storage.as_ref().len());
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let mut val = 0;
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for i in 0..(bit_width as usize) {
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if self.get_bit(i + bit_offset) {
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let index = if cfg!(target_endian = "big") {
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bit_width as usize - 1 - i
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} else {
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i
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};
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val |= 1 << index;
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}
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}
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val
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}
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#[inline]
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pub fn set(&mut self, bit_offset: usize, bit_width: u8, val: u64) {
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debug_assert!(bit_width <= 64);
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debug_assert!(bit_offset / 8 < self.storage.as_ref().len());
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debug_assert!((bit_offset + (bit_width as usize)) / 8 <= self.storage.as_ref().len());
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for i in 0..(bit_width as usize) {
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let mask = 1 << i;
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let val_bit_is_set = val & mask == mask;
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let index = if cfg!(target_endian = "big") {
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bit_width as usize - 1 - i
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} else {
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i
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};
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self.set_bit(index + bit_offset, val_bit_is_set);
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}
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}
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}
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pub const EIA608_CHAR_COUNT: u32 = 176;
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pub const EIA608_CHAR_NULL: &'static [u8; 1usize] = b"\0";
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pub const EIA608_CHAR_SPACE: &'static [u8; 2usize] = b" \0";
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@ -815,124 +734,27 @@ pub const libcaption_stauts_t_LIBCAPTION_READY: libcaption_stauts_t = 2;
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pub const libcaption_stauts_t_LIBCAPTION_CLEAR: libcaption_stauts_t = 3;
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pub type libcaption_stauts_t = u32;
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#[repr(C)]
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#[repr(align(4))]
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#[derive(Debug, Copy, Clone)]
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pub struct caption_frame_cell_t {
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pub _bitfield_1: __BindgenBitfieldUnit<[u8; 1usize], u8>,
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pub uln: u8,
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pub sty: u8,
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pub data: [utf8_char_t; 5usize],
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}
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impl caption_frame_cell_t {
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#[inline]
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pub fn uln(&self) -> ::std::os::raw::c_uint {
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unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 1u8) as u32) }
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}
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#[inline]
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pub fn set_uln(&mut self, val: ::std::os::raw::c_uint) {
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unsafe {
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let val: u32 = ::std::mem::transmute(val);
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self._bitfield_1.set(0usize, 1u8, val as u64)
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}
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}
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#[inline]
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pub fn sty(&self) -> ::std::os::raw::c_uint {
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unsafe { ::std::mem::transmute(self._bitfield_1.get(1usize, 3u8) as u32) }
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}
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#[inline]
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pub fn set_sty(&mut self, val: ::std::os::raw::c_uint) {
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unsafe {
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let val: u32 = ::std::mem::transmute(val);
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self._bitfield_1.set(1usize, 3u8, val as u64)
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}
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}
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#[inline]
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pub fn new_bitfield_1(
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uln: ::std::os::raw::c_uint,
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sty: ::std::os::raw::c_uint,
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) -> __BindgenBitfieldUnit<[u8; 1usize], u8> {
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let mut __bindgen_bitfield_unit: __BindgenBitfieldUnit<[u8; 1usize], u8> =
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Default::default();
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__bindgen_bitfield_unit.set(0usize, 1u8, {
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let uln: u32 = unsafe { ::std::mem::transmute(uln) };
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uln as u64
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});
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__bindgen_bitfield_unit.set(1usize, 3u8, {
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let sty: u32 = unsafe { ::std::mem::transmute(sty) };
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sty as u64
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});
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__bindgen_bitfield_unit
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}
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}
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#[repr(C)]
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#[derive(Debug, Copy, Clone)]
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pub struct caption_frame_buffer_t {
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pub cell: [[caption_frame_cell_t; 32usize]; 15usize],
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}
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#[repr(C)]
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#[repr(align(4))]
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#[derive(Debug, Copy, Clone)]
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pub struct caption_frame_state_t {
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pub _bitfield_1: __BindgenBitfieldUnit<[u8; 1usize], u8>,
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pub uln: u8,
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pub sty: u8,
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pub rup: u8,
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pub row: i8,
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pub col: i8,
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pub cc_data: u16,
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}
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impl caption_frame_state_t {
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#[inline]
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pub fn uln(&self) -> ::std::os::raw::c_uint {
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unsafe { ::std::mem::transmute(self._bitfield_1.get(0usize, 1u8) as u32) }
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}
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#[inline]
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pub fn set_uln(&mut self, val: ::std::os::raw::c_uint) {
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unsafe {
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let val: u32 = ::std::mem::transmute(val);
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self._bitfield_1.set(0usize, 1u8, val as u64)
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}
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}
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#[inline]
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pub fn sty(&self) -> ::std::os::raw::c_uint {
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unsafe { ::std::mem::transmute(self._bitfield_1.get(1usize, 3u8) as u32) }
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}
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#[inline]
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pub fn set_sty(&mut self, val: ::std::os::raw::c_uint) {
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unsafe {
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let val: u32 = ::std::mem::transmute(val);
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self._bitfield_1.set(1usize, 3u8, val as u64)
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}
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}
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#[inline]
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pub fn rup(&self) -> ::std::os::raw::c_uint {
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unsafe { ::std::mem::transmute(self._bitfield_1.get(4usize, 2u8) as u32) }
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}
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#[inline]
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pub fn set_rup(&mut self, val: ::std::os::raw::c_uint) {
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unsafe {
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let val: u32 = ::std::mem::transmute(val);
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self._bitfield_1.set(4usize, 2u8, val as u64)
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}
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}
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#[inline]
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pub fn new_bitfield_1(
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uln: ::std::os::raw::c_uint,
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sty: ::std::os::raw::c_uint,
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rup: ::std::os::raw::c_uint,
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) -> __BindgenBitfieldUnit<[u8; 1usize], u8> {
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let mut __bindgen_bitfield_unit: __BindgenBitfieldUnit<[u8; 1usize], u8> =
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Default::default();
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__bindgen_bitfield_unit.set(0usize, 1u8, {
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let uln: u32 = unsafe { ::std::mem::transmute(uln) };
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uln as u64
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});
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__bindgen_bitfield_unit.set(1usize, 3u8, {
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let sty: u32 = unsafe { ::std::mem::transmute(sty) };
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sty as u64
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});
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__bindgen_bitfield_unit.set(4usize, 2u8, {
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let rup: u32 = unsafe { ::std::mem::transmute(rup) };
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rup as u64
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});
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__bindgen_bitfield_unit
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}
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}
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#[repr(C)]
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#[derive(Debug, Copy, Clone)]
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pub struct caption_frame_t {
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