forked from mirrors/gstreamer-rs
gstreamer/buffer: Add a BufferCursor / BufferCursorRef helper structs
This implements Read/Seek or Write/Seek and allows to read/write/seek into the buffer without merging the memories inside. The writer also only maps the memory write-only as compared to all other ways of accessing the buffer/memory data in a writable way, which have to map it read-write. See https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/425 for a similar API proposal for GStreamer core.
This commit is contained in:
Sebastian Dröge
parent
9b782b4dfa
commit
a884a419db
2 changed files with 652 additions and 1 deletions
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@ -7,6 +7,7 @@
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// except according to those terms.
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use std::fmt;
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use std::io;
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use std::marker::PhantomData;
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use std::mem;
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use std::ops;
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@ -50,6 +51,27 @@ pub struct MappedBuffer<T> {
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phantom: PhantomData<T>,
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}
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pub struct BufferCursor<T> {
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buffer: Option<Buffer>,
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size: u64,
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num_mem: u32,
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cur_mem_idx: u32,
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cur_offset: u64,
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cur_mem_offset: usize,
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map_info: gst_sys::GstMapInfo,
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phantom: PhantomData<T>,
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}
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pub struct BufferCursorRef<T> {
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buffer: T,
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size: u64,
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num_mem: u32,
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cur_mem_idx: u32,
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cur_offset: u64,
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cur_mem_offset: usize,
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map_info: gst_sys::GstMapInfo,
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}
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impl Buffer {
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pub fn new() -> Self {
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assert_initialized_main_thread!();
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@ -159,6 +181,14 @@ impl Buffer {
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}
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}
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pub fn into_buffer_cursor_readable(self) -> BufferCursor<Readable> {
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BufferCursor::new_readable(self)
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}
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pub fn into_buffer_cursor_writable(self) -> Result<BufferCursor<Writable>, glib::BoolError> {
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BufferCursor::new_writable(self)
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}
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pub fn append(&mut self, other: Self) {
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skip_assert_initialized!();
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unsafe {
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@ -621,6 +651,16 @@ impl BufferRef {
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pub fn iter_memories_owned(&self) -> IterOwned {
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IterOwned::new(self)
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}
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pub fn as_buffer_cursor_ref_readable<'a>(&'a self) -> BufferCursorRef<&'a BufferRef> {
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BufferCursorRef::new_readable(self)
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}
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pub fn as_buffer_cursor_ref_writable<'a>(
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&'a mut self,
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) -> Result<BufferCursorRef<&'a mut BufferRef>, glib::BoolError> {
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BufferCursorRef::new_writable(self)
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}
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}
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macro_rules! define_meta_iter(
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@ -1020,6 +1060,617 @@ impl<T> Eq for MappedBuffer<T> {}
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unsafe impl<T> Send for MappedBuffer<T> {}
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unsafe impl<T> Sync for MappedBuffer<T> {}
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impl<T> fmt::Debug for BufferCursor<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("BufferCursor")
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.field("buffer", &self.buffer)
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.field("size", &self.size)
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.field("num_mem", &self.num_mem)
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.field("cur_mem_idx", &self.cur_mem_idx)
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.field("cur_offset", &self.cur_offset)
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.field("cur_mem_offset", &self.cur_mem_offset)
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.field("map_info", &self.map_info)
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.finish()
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}
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}
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impl<T> Drop for BufferCursor<T> {
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fn drop(&mut self) {
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if !self.map_info.memory.is_null() {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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}
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}
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}
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}
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impl io::Read for BufferCursor<Readable> {
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fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
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let mut copied = 0;
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while !data.is_empty() && self.cur_mem_idx < self.num_mem {
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// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
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// set correctly here already (from constructor, seek and the bottom of the loop)
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if self.map_info.memory.is_null() {
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unsafe {
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let memory = gst_sys::gst_buffer_peek_memory(
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self.buffer.as_ref().unwrap().as_mut_ptr(),
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self.cur_mem_idx,
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);
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assert!(!memory.is_null());
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if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
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== glib_sys::GFALSE
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{
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Failed to map memory readable",
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));
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}
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}
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assert!(self.cur_mem_offset < self.map_info.size);
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}
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assert!(!self.map_info.memory.is_null());
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// Copy all data we can currently copy
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let data_left = self.map_info.size - self.cur_mem_offset;
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let to_copy = std::cmp::min(data.len(), data_left);
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unsafe {
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ptr::copy_nonoverlapping(
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(self.map_info.data as *const u8).add(self.cur_mem_offset),
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data.as_mut_ptr(),
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to_copy,
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);
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}
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copied += to_copy;
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self.cur_offset += to_copy as u64;
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self.cur_mem_offset += to_copy;
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data = &mut data[to_copy..];
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// If we're at the end of the current memory, unmap and advance to the next memory
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if self.cur_mem_offset == self.map_info.size {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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}
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self.map_info.memory = ptr::null_mut();
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self.cur_mem_idx += 1;
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self.cur_mem_offset = 0;
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}
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}
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Ok(copied)
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}
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}
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impl io::Write for BufferCursor<Writable> {
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fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
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let mut copied = 0;
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while !data.is_empty() && self.cur_mem_idx < self.num_mem {
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// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
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// set correctly here already (from constructor, seek and the bottom of the loop)
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if self.map_info.memory.is_null() {
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unsafe {
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let memory = gst_sys::gst_buffer_peek_memory(
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self.buffer.as_ref().unwrap().as_mut_ptr(),
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self.cur_mem_idx,
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);
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assert!(!memory.is_null());
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if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
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== glib_sys::GFALSE
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{
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Failed to map memory writable",
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));
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}
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}
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assert!(self.cur_mem_offset < self.map_info.size);
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}
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assert!(!self.map_info.memory.is_null());
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// Copy all data we can currently copy
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let data_left = self.map_info.size - self.cur_mem_offset;
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let to_copy = std::cmp::min(data.len(), data_left);
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unsafe {
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ptr::copy_nonoverlapping(
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data.as_ptr(),
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(self.map_info.data as *mut u8).add(self.cur_mem_offset),
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to_copy,
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);
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}
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copied += to_copy;
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self.cur_offset += to_copy as u64;
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self.cur_mem_offset += to_copy;
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data = &data[to_copy..];
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// If we're at the end of the current memory, unmap and advance to the next memory
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if self.cur_mem_offset == self.map_info.size {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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}
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self.map_info.memory = ptr::null_mut();
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self.cur_mem_idx += 1;
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self.cur_mem_offset = 0;
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}
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}
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Ok(copied)
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}
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fn flush(&mut self) -> Result<(), io::Error> {
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Ok(())
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}
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}
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impl<T> io::Seek for BufferCursor<T> {
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fn seek(&mut self, pos: io::SeekFrom) -> Result<u64, io::Error> {
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if !self.map_info.memory.is_null() {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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self.map_info.memory = ptr::null_mut();
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}
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}
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match pos {
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io::SeekFrom::Start(off) => {
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self.cur_offset = std::cmp::min(self.size, off);
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}
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io::SeekFrom::End(off) if off <= 0 => {
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self.cur_offset = self.size;
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}
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io::SeekFrom::End(off) => {
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self.cur_offset = self.size.checked_sub(off as u64).ok_or_else(|| {
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io::Error::new(io::ErrorKind::InvalidInput, "Seek before start of buffer")
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})?;
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}
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io::SeekFrom::Current(std::i64::MIN) => {
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return Err(io::Error::new(
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io::ErrorKind::InvalidInput,
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"Seek before start of buffer",
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));
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}
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io::SeekFrom::Current(off) => {
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if off <= 0 {
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self.cur_offset =
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self.cur_offset.checked_sub((-off) as u64).ok_or_else(|| {
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io::Error::new(
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io::ErrorKind::InvalidInput,
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"Seek before start of buffer",
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)
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})?;
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} else {
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self.cur_offset = std::cmp::min(
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self.size,
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self.cur_offset.checked_add(off as u64).unwrap_or(self.size),
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);
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}
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}
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}
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let (idx, _, skip) = self
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.buffer
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.as_ref()
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.unwrap()
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.find_memory(self.cur_offset as usize, None)
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.expect("Failed to find memory");
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self.cur_mem_idx = idx;
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self.cur_mem_offset = skip;
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Ok(self.cur_offset)
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}
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// Once stabilized
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// fn stream_len(&mut self) -> Result<u64, io::Error> {
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// Ok(self.size)
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// }
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//
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// fn stream_position(&mut self) -> Result<u64, io::Error> {
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// Ok(self.current_offset)
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// }
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}
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impl<T> BufferCursor<T> {
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pub fn stream_len(&mut self) -> Result<u64, io::Error> {
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Ok(self.size)
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}
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pub fn stream_position(&mut self) -> Result<u64, io::Error> {
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Ok(self.cur_offset)
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}
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pub fn get_buffer(&self) -> &BufferRef {
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self.buffer.as_ref().unwrap().as_ref()
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}
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pub fn into_buffer(mut self) -> Buffer {
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self.buffer.take().unwrap()
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}
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}
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impl BufferCursor<Readable> {
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fn new_readable(buffer: Buffer) -> BufferCursor<Readable> {
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let size = buffer.get_size() as u64;
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let num_mem = buffer.n_memory();
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BufferCursor {
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buffer: Some(buffer),
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size,
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num_mem,
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cur_mem_idx: 0,
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cur_offset: 0,
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cur_mem_offset: 0,
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map_info: unsafe { mem::zeroed() },
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phantom: PhantomData,
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}
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}
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}
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impl BufferCursor<Writable> {
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fn new_writable(buffer: Buffer) -> Result<BufferCursor<Writable>, glib::BoolError> {
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if !buffer.is_writable() || !buffer.is_all_memory_writable() {
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return Err(glib_bool_error!("Not all memories are writable"));
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}
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let size = buffer.get_size() as u64;
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let num_mem = buffer.n_memory();
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Ok(BufferCursor {
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buffer: Some(buffer),
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size,
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num_mem,
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cur_mem_idx: 0,
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cur_offset: 0,
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cur_mem_offset: 0,
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map_info: unsafe { mem::zeroed() },
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phantom: PhantomData,
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})
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}
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}
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unsafe impl<T> Send for BufferCursor<T> {}
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unsafe impl<T> Sync for BufferCursor<T> {}
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impl<T: fmt::Debug> fmt::Debug for BufferCursorRef<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("BufferCursorRef")
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.field("buffer", &self.buffer)
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.field("size", &self.size)
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.field("num_mem", &self.num_mem)
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.field("cur_mem_idx", &self.cur_mem_idx)
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.field("cur_offset", &self.cur_offset)
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.field("cur_mem_offset", &self.cur_mem_offset)
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.field("map_info", &self.map_info)
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.finish()
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}
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}
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impl<T> Drop for BufferCursorRef<T> {
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fn drop(&mut self) {
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if !self.map_info.memory.is_null() {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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}
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}
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}
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}
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impl<'a> io::Read for BufferCursorRef<&'a BufferRef> {
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fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
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let mut copied = 0;
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while !data.is_empty() && self.cur_mem_idx < self.num_mem {
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// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
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// set correctly here already (from constructor, seek and the bottom of the loop)
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if self.map_info.memory.is_null() {
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unsafe {
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let memory =
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gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
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assert!(!memory.is_null());
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if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
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== glib_sys::GFALSE
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{
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Failed to map memory readable",
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));
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}
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}
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assert!(self.cur_mem_offset < self.map_info.size);
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}
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assert!(!self.map_info.memory.is_null());
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// Copy all data we can currently copy
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let data_left = self.map_info.size - self.cur_mem_offset;
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let to_copy = std::cmp::min(data.len(), data_left);
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unsafe {
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ptr::copy_nonoverlapping(
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(self.map_info.data as *const u8).add(self.cur_mem_offset),
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data.as_mut_ptr(),
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to_copy,
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);
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}
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copied += to_copy;
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self.cur_offset += to_copy as u64;
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self.cur_mem_offset += to_copy;
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data = &mut data[to_copy..];
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// If we're at the end of the current memory, unmap and advance to the next memory
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if self.cur_mem_offset == self.map_info.size {
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unsafe {
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gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
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}
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self.map_info.memory = ptr::null_mut();
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self.cur_mem_idx += 1;
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self.cur_mem_offset = 0;
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}
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}
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Ok(copied)
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}
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}
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impl<'a> io::Write for BufferCursorRef<&'a mut BufferRef> {
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fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
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let mut copied = 0;
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while !data.is_empty() && self.cur_mem_idx < self.num_mem {
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// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
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// set correctly here already (from constructor, seek and the bottom of the loop)
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if self.map_info.memory.is_null() {
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unsafe {
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let memory =
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gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
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assert!(!memory.is_null());
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if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
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== glib_sys::GFALSE
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{
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return Err(io::Error::new(
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io::ErrorKind::InvalidData,
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"Failed to map memory writable",
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));
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}
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}
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assert!(self.cur_mem_offset < self.map_info.size);
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}
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assert!(!self.map_info.memory.is_null());
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// Copy all data we can currently copy
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let data_left = self.map_info.size - self.cur_mem_offset;
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let to_copy = std::cmp::min(data.len(), data_left);
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unsafe {
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ptr::copy_nonoverlapping(
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data.as_ptr(),
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||||
(self.map_info.data as *mut u8).add(self.cur_mem_offset),
|
||||
to_copy,
|
||||
);
|
||||
}
|
||||
copied += to_copy;
|
||||
self.cur_offset += to_copy as u64;
|
||||
self.cur_mem_offset += to_copy;
|
||||
data = &data[to_copy..];
|
||||
|
||||
// If we're at the end of the current memory, unmap and advance to the next memory
|
||||
if self.cur_mem_offset == self.map_info.size {
|
||||
unsafe {
|
||||
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
|
||||
}
|
||||
self.map_info.memory = ptr::null_mut();
|
||||
self.cur_mem_idx += 1;
|
||||
self.cur_mem_offset = 0;
|
||||
}
|
||||
}
|
||||
|
||||
Ok(copied)
|
||||
}
|
||||
|
||||
fn flush(&mut self) -> Result<(), io::Error> {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> io::Seek for BufferCursorRef<&'a BufferRef> {
|
||||
fn seek(&mut self, pos: io::SeekFrom) -> Result<u64, io::Error> {
|
||||
if !self.map_info.memory.is_null() {
|
||||
unsafe {
|
||||
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
|
||||
self.map_info.memory = ptr::null_mut();
|
||||
}
|
||||
}
|
||||
|
||||
match pos {
|
||||
io::SeekFrom::Start(off) => {
|
||||
self.cur_offset = std::cmp::min(self.size, off);
|
||||
}
|
||||
io::SeekFrom::End(off) if off <= 0 => {
|
||||
self.cur_offset = self.size;
|
||||
}
|
||||
io::SeekFrom::End(off) => {
|
||||
self.cur_offset = self.size.checked_sub(off as u64).ok_or_else(|| {
|
||||
io::Error::new(io::ErrorKind::InvalidInput, "Seek before start of buffer")
|
||||
})?;
|
||||
}
|
||||
io::SeekFrom::Current(std::i64::MIN) => {
|
||||
return Err(io::Error::new(
|
||||
io::ErrorKind::InvalidInput,
|
||||
"Seek before start of buffer",
|
||||
));
|
||||
}
|
||||
io::SeekFrom::Current(off) => {
|
||||
if off <= 0 {
|
||||
self.cur_offset =
|
||||
self.cur_offset.checked_sub((-off) as u64).ok_or_else(|| {
|
||||
io::Error::new(
|
||||
io::ErrorKind::InvalidInput,
|
||||
"Seek before start of buffer",
|
||||
)
|
||||
})?;
|
||||
} else {
|
||||
self.cur_offset = std::cmp::min(
|
||||
self.size,
|
||||
self.cur_offset.checked_add(off as u64).unwrap_or(self.size),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let (idx, _, skip) = self
|
||||
.buffer
|
||||
.find_memory(self.cur_offset as usize, None)
|
||||
.expect("Failed to find memory");
|
||||
self.cur_mem_idx = idx;
|
||||
self.cur_mem_offset = skip;
|
||||
|
||||
Ok(self.cur_offset)
|
||||
}
|
||||
|
||||
// Once stabilized
|
||||
// fn stream_len(&mut self) -> Result<u64, io::Error> {
|
||||
// Ok(self.size)
|
||||
// }
|
||||
//
|
||||
// fn stream_position(&mut self) -> Result<u64, io::Error> {
|
||||
// Ok(self.current_offset)
|
||||
// }
|
||||
}
|
||||
|
||||
impl<'a> io::Seek for BufferCursorRef<&'a mut BufferRef> {
|
||||
fn seek(&mut self, pos: io::SeekFrom) -> Result<u64, io::Error> {
|
||||
if !self.map_info.memory.is_null() {
|
||||
unsafe {
|
||||
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
|
||||
self.map_info.memory = ptr::null_mut();
|
||||
}
|
||||
}
|
||||
|
||||
match pos {
|
||||
io::SeekFrom::Start(off) => {
|
||||
self.cur_offset = std::cmp::min(self.size, off);
|
||||
}
|
||||
io::SeekFrom::End(off) if off <= 0 => {
|
||||
self.cur_offset = self.size;
|
||||
}
|
||||
io::SeekFrom::End(off) => {
|
||||
self.cur_offset = self.size.checked_sub(off as u64).ok_or_else(|| {
|
||||
io::Error::new(io::ErrorKind::InvalidInput, "Seek before start of buffer")
|
||||
})?;
|
||||
}
|
||||
io::SeekFrom::Current(std::i64::MIN) => {
|
||||
return Err(io::Error::new(
|
||||
io::ErrorKind::InvalidInput,
|
||||
"Seek before start of buffer",
|
||||
));
|
||||
}
|
||||
io::SeekFrom::Current(off) => {
|
||||
if off <= 0 {
|
||||
self.cur_offset =
|
||||
self.cur_offset.checked_sub((-off) as u64).ok_or_else(|| {
|
||||
io::Error::new(
|
||||
io::ErrorKind::InvalidInput,
|
||||
"Seek before start of buffer",
|
||||
)
|
||||
})?;
|
||||
} else {
|
||||
self.cur_offset = std::cmp::min(
|
||||
self.size,
|
||||
self.cur_offset.checked_add(off as u64).unwrap_or(self.size),
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
let (idx, _, skip) = self
|
||||
.buffer
|
||||
.find_memory(self.cur_offset as usize, None)
|
||||
.expect("Failed to find memory");
|
||||
self.cur_mem_idx = idx;
|
||||
self.cur_mem_offset = skip;
|
||||
|
||||
Ok(self.cur_offset)
|
||||
}
|
||||
|
||||
// Once stabilized
|
||||
// fn stream_len(&mut self) -> Result<u64, io::Error> {
|
||||
// Ok(self.size)
|
||||
// }
|
||||
//
|
||||
// fn stream_position(&mut self) -> Result<u64, io::Error> {
|
||||
// Ok(self.current_offset)
|
||||
// }
|
||||
}
|
||||
|
||||
impl<T> BufferCursorRef<T> {
|
||||
pub fn stream_len(&mut self) -> Result<u64, io::Error> {
|
||||
Ok(self.size)
|
||||
}
|
||||
|
||||
pub fn stream_position(&mut self) -> Result<u64, io::Error> {
|
||||
Ok(self.cur_offset)
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> BufferCursorRef<&'a BufferRef> {
|
||||
pub fn get_buffer(&self) -> &BufferRef {
|
||||
self.buffer
|
||||
}
|
||||
|
||||
fn new_readable(buffer: &'a BufferRef) -> BufferCursorRef<&'a BufferRef> {
|
||||
let size = buffer.get_size() as u64;
|
||||
let num_mem = buffer.n_memory();
|
||||
|
||||
BufferCursorRef {
|
||||
buffer,
|
||||
size,
|
||||
num_mem,
|
||||
cur_mem_idx: 0,
|
||||
cur_offset: 0,
|
||||
cur_mem_offset: 0,
|
||||
map_info: unsafe { mem::zeroed() },
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> BufferCursorRef<&'a mut BufferRef> {
|
||||
pub fn get_buffer(&self) -> &BufferRef {
|
||||
self.buffer
|
||||
}
|
||||
|
||||
fn new_writable(
|
||||
buffer: &'a mut BufferRef,
|
||||
) -> Result<BufferCursorRef<&'a mut BufferRef>, glib::BoolError> {
|
||||
if !buffer.is_all_memory_writable() {
|
||||
return Err(glib_bool_error!("Not all memories are writable"));
|
||||
}
|
||||
|
||||
let size = buffer.get_size() as u64;
|
||||
let num_mem = buffer.n_memory();
|
||||
|
||||
Ok(BufferCursorRef {
|
||||
buffer,
|
||||
size,
|
||||
num_mem,
|
||||
cur_mem_idx: 0,
|
||||
cur_offset: 0,
|
||||
cur_mem_offset: 0,
|
||||
map_info: unsafe { mem::zeroed() },
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
unsafe impl<T> Send for BufferCursorRef<T> {}
|
||||
unsafe impl<T> Sync for BufferCursorRef<T> {}
|
||||
|
||||
pub const BUFFER_COPY_METADATA: ::BufferCopyFlags =
|
||||
::BufferCopyFlags::from_bits_truncate(gst_sys::GST_BUFFER_COPY_METADATA);
|
||||
pub const BUFFER_COPY_ALL: ::BufferCopyFlags =
|
||||
|
|
|
|||
|
|
@ -126,7 +126,7 @@ pub use meta::ReferenceTimestampMeta;
|
|||
pub use meta::{Meta, MetaAPI, MetaRef, MetaRefMut, ParentBufferMeta};
|
||||
pub mod buffer;
|
||||
pub use buffer::{
|
||||
Buffer, BufferMap, BufferRef, MappedBuffer, BUFFER_COPY_ALL, BUFFER_COPY_METADATA,
|
||||
Buffer, BufferCursor, BufferMap, BufferRef, MappedBuffer, BUFFER_COPY_ALL, BUFFER_COPY_METADATA,
|
||||
};
|
||||
pub mod memory;
|
||||
pub use memory::{MappedMemory, Memory, MemoryMap, MemoryRef};
|
||||
|
|
|
|||
Loading…
Reference in a new issue