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gstreamer/buffer: Move BufferCursor/BufferRefCursor into its own module

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It's quite a bit of code and can be kept nicely separate.
This commit is contained in:
Sebastian Dröge 2020-04-07 12:56:22 +03:00
parent 5fc68e252d
commit 42d09c2834
3 changed files with 859 additions and 827 deletions
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835
gstreamer/src/buffer.rs
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@ -1,4 +1,4 @@
// Copyright (C) 2016-2017 Sebastian Dröge <sebastian@centricular.com>
// Copyright (C) 2016-2020 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
@ -7,7 +7,6 @@
// except according to those terms.
use std::fmt;
use std::io;
use std::marker::PhantomData;
use std::mem;
use std::ops;
@ -18,7 +17,9 @@ use std::usize;
use meta::*;
use miniobject::*;
use BufferCursor;
use BufferFlags;
use BufferRefCursor;
use ClockTime;
use Memory;
use MemoryRef;
@ -51,27 +52,6 @@ pub struct MappedBuffer<T> {
phantom: PhantomData<T>,
}
pub struct BufferCursor<T> {
buffer: Option<Buffer>,
size: u64,
num_mem: u32,
cur_mem_idx: u32,
cur_offset: u64,
cur_mem_offset: usize,
map_info: gst_sys::GstMapInfo,
phantom: PhantomData<T>,
}
pub struct BufferCursorRef<T> {
buffer: T,
size: u64,
num_mem: u32,
cur_mem_idx: u32,
cur_offset: u64,
cur_mem_offset: usize,
map_info: gst_sys::GstMapInfo,
}
impl Buffer {
pub fn new() -> Self {
assert_initialized_main_thread!();
@ -181,11 +161,11 @@ impl Buffer {
}
}
pub fn into_buffer_cursor_readable(self) -> BufferCursor<Readable> {
pub fn into_cursor_readable(self) -> BufferCursor<Readable> {
BufferCursor::new_readable(self)
}
pub fn into_buffer_cursor_writable(self) -> Result<BufferCursor<Writable>, glib::BoolError> {
pub fn into_cursor_writable(self) -> Result<BufferCursor<Writable>, glib::BoolError> {
BufferCursor::new_writable(self)
}
@ -652,14 +632,14 @@ impl BufferRef {
IterOwned::new(self)
}
pub fn as_buffer_cursor_ref_readable<'a>(&'a self) -> BufferCursorRef<&'a BufferRef> {
BufferCursorRef::new_readable(self)
pub fn as_cursor_readable<'a>(&'a self) -> BufferRefCursor<&'a BufferRef> {
BufferRefCursor::new_readable(self)
}
pub fn as_buffer_cursor_ref_writable<'a>(
pub fn as_cursor_writable<'a>(
&'a mut self,
) -> Result<BufferCursorRef<&'a mut BufferRef>, glib::BoolError> {
BufferCursorRef::new_writable(self)
) -> Result<BufferRefCursor<&'a mut BufferRef>, glib::BoolError> {
BufferRefCursor::new_writable(self)
}
}
@ -1060,617 +1040,6 @@ impl<T> Eq for MappedBuffer<T> {}
unsafe impl<T> Send for MappedBuffer<T> {}
unsafe impl<T> Sync for MappedBuffer<T> {}
impl<T> fmt::Debug for BufferCursor<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("BufferCursor")
.field("buffer", &self.buffer)
.field("size", &self.size)
.field("num_mem", &self.num_mem)
.field("cur_mem_idx", &self.cur_mem_idx)
.field("cur_offset", &self.cur_offset)
.field("cur_mem_offset", &self.cur_mem_offset)
.field("map_info", &self.map_info)
.finish()
}
}
impl<T> Drop for BufferCursor<T> {
fn drop(&mut self) {
if !self.map_info.memory.is_null() {
unsafe {
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
}
}
}
}
impl io::Read for BufferCursor<Readable> {
fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory = gst_sys::gst_buffer_peek_memory(
self.buffer.as_ref().unwrap().as_mut_ptr(),
self.cur_mem_idx,
);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory readable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
(self.map_info.data as *const u8).add(self.cur_mem_offset),
data.as_mut_ptr(),
to_copy,
);
}
copied += to_copy;
self.cur_offset += to_copy as u64;
self.cur_mem_offset += to_copy;
data = &mut 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)
}
}
impl io::Write for BufferCursor<Writable> {
fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory = gst_sys::gst_buffer_peek_memory(
self.buffer.as_ref().unwrap().as_mut_ptr(),
self.cur_mem_idx,
);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory writable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
data.as_ptr(),
(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<T> io::Seek for BufferCursor<T> {
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
.as_ref()
.unwrap()
.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> BufferCursor<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)
}
pub fn get_buffer(&self) -> &BufferRef {
self.buffer.as_ref().unwrap().as_ref()
}
pub fn into_buffer(mut self) -> Buffer {
self.buffer.take().unwrap()
}
}
impl BufferCursor<Readable> {
fn new_readable(buffer: Buffer) -> BufferCursor<Readable> {
let size = buffer.get_size() as u64;
let num_mem = buffer.n_memory();
BufferCursor {
buffer: Some(buffer),
size,
num_mem,
cur_mem_idx: 0,
cur_offset: 0,
cur_mem_offset: 0,
map_info: unsafe { mem::zeroed() },
phantom: PhantomData,
}
}
}
impl BufferCursor<Writable> {
fn new_writable(buffer: Buffer) -> Result<BufferCursor<Writable>, glib::BoolError> {
if !buffer.is_writable() || !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(BufferCursor {
buffer: Some(buffer),
size,
num_mem,
cur_mem_idx: 0,
cur_offset: 0,
cur_mem_offset: 0,
map_info: unsafe { mem::zeroed() },
phantom: PhantomData,
})
}
}
unsafe impl<T> Send for BufferCursor<T> {}
unsafe impl<T> Sync for BufferCursor<T> {}
impl<T: fmt::Debug> fmt::Debug for BufferCursorRef<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("BufferCursorRef")
.field("buffer", &self.buffer)
.field("size", &self.size)
.field("num_mem", &self.num_mem)
.field("cur_mem_idx", &self.cur_mem_idx)
.field("cur_offset", &self.cur_offset)
.field("cur_mem_offset", &self.cur_mem_offset)
.field("map_info", &self.map_info)
.finish()
}
}
impl<T> Drop for BufferCursorRef<T> {
fn drop(&mut self) {
if !self.map_info.memory.is_null() {
unsafe {
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
}
}
}
}
impl<'a> io::Read for BufferCursorRef<&'a BufferRef> {
fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory =
gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory readable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
(self.map_info.data as *const u8).add(self.cur_mem_offset),
data.as_mut_ptr(),
to_copy,
);
}
copied += to_copy;
self.cur_offset += to_copy as u64;
self.cur_mem_offset += to_copy;
data = &mut 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)
}
}
impl<'a> io::Write for BufferCursorRef<&'a mut BufferRef> {
fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory =
gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory writable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
data.as_ptr(),
(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 =
@ -1856,188 +1225,4 @@ mod tests {
assert_eq!(last, 4);
}
#[test]
fn test_buffer_cursor() {
use std::io::{self, Read, Seek, Write};
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 10]));
}
assert!(buffer.is_all_memory_writable());
assert_eq!(buffer.n_memory(), 5);
assert_eq!(buffer.get_size(), 30);
let mut cursor = buffer.into_buffer_cursor_writable().unwrap();
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.write_all(b"01234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 8);
cursor.write_all(b"890123").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 14);
cursor.write_all(b"456").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 17);
cursor.write_all(b"78901234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 28);
cursor.write_all(b"89").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert!(cursor.write_all(b"0").is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.write_all(b"A").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"B").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"C").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.write_all(b"D").unwrap();
let buffer = cursor.into_buffer();
let mut cursor = buffer.into_buffer_cursor_readable();
let mut data = [0; 30];
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.read_exact(&mut data[0..7]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 7);
assert_eq!(&data[0..7], b"01234A6");
cursor.read_exact(&mut data[0..5]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 12);
assert_eq!(&data[0..5], b"78901");
cursor.read_exact(&mut data[0..10]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 22);
assert_eq!(&data[0..10], b"2345678901");
cursor.read_exact(&mut data[0..8]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert_eq!(&data[0..8], b"234C6D89");
assert!(cursor.read_exact(&mut data[0..1]).is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"A");
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"D");
}
#[test]
fn test_buffer_cursor_ref() {
use std::io::{self, Read, Seek, Write};
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 10]));
}
assert!(buffer.is_all_memory_writable());
assert_eq!(buffer.n_memory(), 5);
assert_eq!(buffer.get_size(), 30);
{
let buffer = buffer.get_mut().unwrap();
let mut cursor = buffer.as_buffer_cursor_ref_writable().unwrap();
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.write_all(b"01234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 8);
cursor.write_all(b"890123").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 14);
cursor.write_all(b"456").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 17);
cursor.write_all(b"78901234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 28);
cursor.write_all(b"89").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert!(cursor.write_all(b"0").is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.write_all(b"A").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"B").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"C").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.write_all(b"D").unwrap();
}
let mut cursor = buffer.as_buffer_cursor_ref_readable();
let mut data = [0; 30];
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.read_exact(&mut data[0..7]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 7);
assert_eq!(&data[0..7], b"01234A6");
cursor.read_exact(&mut data[0..5]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 12);
assert_eq!(&data[0..5], b"78901");
cursor.read_exact(&mut data[0..10]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 22);
assert_eq!(&data[0..10], b"2345678901");
cursor.read_exact(&mut data[0..8]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert_eq!(&data[0..8], b"234C6D89");
assert!(cursor.read_exact(&mut data[0..1]).is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"A");
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"D");
}
}

846
gstreamer/src/buffer_cursor.rs Normal file
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@ -0,0 +1,846 @@
// Copyright (C) 2020 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 std::fmt;
use std::io;
use std::marker::PhantomData;
use std::mem;
use std::ptr;
use std::u64;
use std::usize;
use miniobject::*;
use Buffer;
use BufferRef;
use glib;
use glib_sys;
use gst_sys;
use buffer::{Readable, Writable};
pub struct BufferCursor<T> {
buffer: Option<Buffer>,
size: u64,
num_mem: u32,
cur_mem_idx: u32,
cur_offset: u64,
cur_mem_offset: usize,
map_info: gst_sys::GstMapInfo,
phantom: PhantomData<T>,
}
pub struct BufferRefCursor<T> {
buffer: T,
size: u64,
num_mem: u32,
cur_mem_idx: u32,
cur_offset: u64,
cur_mem_offset: usize,
map_info: gst_sys::GstMapInfo,
}
impl<T> fmt::Debug for BufferCursor<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("BufferCursor")
.field("buffer", &self.buffer)
.field("size", &self.size)
.field("num_mem", &self.num_mem)
.field("cur_mem_idx", &self.cur_mem_idx)
.field("cur_offset", &self.cur_offset)
.field("cur_mem_offset", &self.cur_mem_offset)
.field("map_info", &self.map_info)
.finish()
}
}
impl<T> Drop for BufferCursor<T> {
fn drop(&mut self) {
if !self.map_info.memory.is_null() {
unsafe {
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
}
}
}
}
impl io::Read for BufferCursor<Readable> {
fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory = gst_sys::gst_buffer_peek_memory(
self.buffer.as_ref().unwrap().as_mut_ptr(),
self.cur_mem_idx,
);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory readable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
(self.map_info.data as *const u8).add(self.cur_mem_offset),
data.as_mut_ptr(),
to_copy,
);
}
copied += to_copy;
self.cur_offset += to_copy as u64;
self.cur_mem_offset += to_copy;
data = &mut 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)
}
}
impl io::Write for BufferCursor<Writable> {
fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory = gst_sys::gst_buffer_peek_memory(
self.buffer.as_ref().unwrap().as_mut_ptr(),
self.cur_mem_idx,
);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory writable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
data.as_ptr(),
(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<T> io::Seek for BufferCursor<T> {
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
.as_ref()
.unwrap()
.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> BufferCursor<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)
}
pub fn get_buffer(&self) -> &BufferRef {
self.buffer.as_ref().unwrap().as_ref()
}
pub fn into_buffer(mut self) -> Buffer {
self.buffer.take().unwrap()
}
}
impl BufferCursor<Readable> {
pub(crate) fn new_readable(buffer: Buffer) -> BufferCursor<Readable> {
let size = buffer.get_size() as u64;
let num_mem = buffer.n_memory();
BufferCursor {
buffer: Some(buffer),
size,
num_mem,
cur_mem_idx: 0,
cur_offset: 0,
cur_mem_offset: 0,
map_info: unsafe { mem::zeroed() },
phantom: PhantomData,
}
}
}
impl BufferCursor<Writable> {
pub(crate) fn new_writable(buffer: Buffer) -> Result<BufferCursor<Writable>, glib::BoolError> {
if !buffer.is_writable() || !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(BufferCursor {
buffer: Some(buffer),
size,
num_mem,
cur_mem_idx: 0,
cur_offset: 0,
cur_mem_offset: 0,
map_info: unsafe { mem::zeroed() },
phantom: PhantomData,
})
}
}
unsafe impl<T> Send for BufferCursor<T> {}
unsafe impl<T> Sync for BufferCursor<T> {}
impl<T: fmt::Debug> fmt::Debug for BufferRefCursor<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("BufferRefCursor")
.field("buffer", &self.buffer)
.field("size", &self.size)
.field("num_mem", &self.num_mem)
.field("cur_mem_idx", &self.cur_mem_idx)
.field("cur_offset", &self.cur_offset)
.field("cur_mem_offset", &self.cur_mem_offset)
.field("map_info", &self.map_info)
.finish()
}
}
impl<T> Drop for BufferRefCursor<T> {
fn drop(&mut self) {
if !self.map_info.memory.is_null() {
unsafe {
gst_sys::gst_memory_unmap(self.map_info.memory, &mut self.map_info);
}
}
}
}
impl<'a> io::Read for BufferRefCursor<&'a BufferRef> {
fn read(&mut self, mut data: &mut [u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory =
gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_READ)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory readable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
(self.map_info.data as *const u8).add(self.cur_mem_offset),
data.as_mut_ptr(),
to_copy,
);
}
copied += to_copy;
self.cur_offset += to_copy as u64;
self.cur_mem_offset += to_copy;
data = &mut 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)
}
}
impl<'a> io::Write for BufferRefCursor<&'a mut BufferRef> {
fn write(&mut self, mut data: &[u8]) -> Result<usize, io::Error> {
let mut copied = 0;
while !data.is_empty() && self.cur_mem_idx < self.num_mem {
// Map memory if needed. cur_mem_idx, cur_mem_offset and cur_offset are required to be
// set correctly here already (from constructor, seek and the bottom of the loop)
if self.map_info.memory.is_null() {
unsafe {
let memory =
gst_sys::gst_buffer_peek_memory(self.buffer.as_mut_ptr(), self.cur_mem_idx);
assert!(!memory.is_null());
if gst_sys::gst_memory_map(memory, &mut self.map_info, gst_sys::GST_MAP_WRITE)
== glib_sys::GFALSE
{
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"Failed to map memory writable",
));
}
}
assert!(self.cur_mem_offset < self.map_info.size);
}
assert!(!self.map_info.memory.is_null());
// Copy all data we can currently copy
let data_left = self.map_info.size - self.cur_mem_offset;
let to_copy = std::cmp::min(data.len(), data_left);
unsafe {
ptr::copy_nonoverlapping(
data.as_ptr(),
(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 BufferRefCursor<&'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 BufferRefCursor<&'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> BufferRefCursor<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> BufferRefCursor<&'a BufferRef> {
pub fn get_buffer(&self) -> &BufferRef {
self.buffer
}
pub(crate) fn new_readable(buffer: &'a BufferRef) -> BufferRefCursor<&'a BufferRef> {
let size = buffer.get_size() as u64;
let num_mem = buffer.n_memory();
BufferRefCursor {
buffer,
size,
num_mem,
cur_mem_idx: 0,
cur_offset: 0,
cur_mem_offset: 0,
map_info: unsafe { mem::zeroed() },
}
}
}
impl<'a> BufferRefCursor<&'a mut BufferRef> {
pub fn get_buffer(&self) -> &BufferRef {
self.buffer
}
pub(crate) fn new_writable(
buffer: &'a mut BufferRef,
) -> Result<BufferRefCursor<&'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(BufferRefCursor {
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 BufferRefCursor<T> {}
unsafe impl<T> Sync for BufferRefCursor<T> {}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_buffer_cursor() {
use std::io::{self, Read, Seek, Write};
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 10]));
}
assert!(buffer.is_all_memory_writable());
assert_eq!(buffer.n_memory(), 5);
assert_eq!(buffer.get_size(), 30);
let mut cursor = buffer.into_cursor_writable().unwrap();
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.write_all(b"01234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 8);
cursor.write_all(b"890123").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 14);
cursor.write_all(b"456").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 17);
cursor.write_all(b"78901234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 28);
cursor.write_all(b"89").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert!(cursor.write_all(b"0").is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.write_all(b"A").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"B").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"C").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.write_all(b"D").unwrap();
let buffer = cursor.into_buffer();
let mut cursor = buffer.into_cursor_readable();
let mut data = [0; 30];
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.read_exact(&mut data[0..7]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 7);
assert_eq!(&data[0..7], b"01234A6");
cursor.read_exact(&mut data[0..5]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 12);
assert_eq!(&data[0..5], b"78901");
cursor.read_exact(&mut data[0..10]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 22);
assert_eq!(&data[0..10], b"2345678901");
cursor.read_exact(&mut data[0..8]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert_eq!(&data[0..8], b"234C6D89");
assert!(cursor.read_exact(&mut data[0..1]).is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"A");
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"D");
}
#[test]
fn test_buffer_cursor_ref() {
use std::io::{self, Read, Seek, Write};
::init().unwrap();
let mut buffer = Buffer::new();
{
let buffer = buffer.get_mut().unwrap();
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 5]));
buffer.append_memory(::Memory::from_mut_slice(vec![0; 10]));
}
assert!(buffer.is_all_memory_writable());
assert_eq!(buffer.n_memory(), 5);
assert_eq!(buffer.get_size(), 30);
{
let buffer = buffer.get_mut().unwrap();
let mut cursor = buffer.as_cursor_writable().unwrap();
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.write_all(b"01234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 8);
cursor.write_all(b"890123").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 14);
cursor.write_all(b"456").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 17);
cursor.write_all(b"78901234567").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 28);
cursor.write_all(b"89").unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert!(cursor.write_all(b"0").is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.write_all(b"A").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"B").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.write_all(b"C").unwrap();
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.write_all(b"D").unwrap();
}
let mut cursor = buffer.as_cursor_readable();
let mut data = [0; 30];
assert_eq!(cursor.stream_position().unwrap(), 0);
cursor.read_exact(&mut data[0..7]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 7);
assert_eq!(&data[0..7], b"01234A6");
cursor.read_exact(&mut data[0..5]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 12);
assert_eq!(&data[0..5], b"78901");
cursor.read_exact(&mut data[0..10]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 22);
assert_eq!(&data[0..10], b"2345678901");
cursor.read_exact(&mut data[0..8]).unwrap();
assert_eq!(cursor.stream_position().unwrap(), 30);
assert_eq!(&data[0..8], b"234C6D89");
assert!(cursor.read_exact(&mut data[0..1]).is_err());
assert_eq!(cursor.seek(io::SeekFrom::Start(5)).unwrap(), 5);
assert_eq!(cursor.stream_position().unwrap(), 5);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"A");
assert_eq!(cursor.seek(io::SeekFrom::End(5)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(-1)).unwrap(), 25);
assert_eq!(cursor.stream_position().unwrap(), 25);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"C");
assert_eq!(cursor.seek(io::SeekFrom::Current(1)).unwrap(), 27);
assert_eq!(cursor.stream_position().unwrap(), 27);
cursor.read_exact(&mut data[0..1]).unwrap();
assert_eq!(&data[0..1], b"D");
}
}

5
gstreamer/src/lib.rs
View file

@ -126,9 +126,10 @@ pub use meta::ReferenceTimestampMeta;
pub use meta::{Meta, MetaAPI, MetaRef, MetaRefMut, ParentBufferMeta};
pub mod buffer;
pub use buffer::{
Buffer, BufferCursor, BufferCursorRef, BufferMap, BufferRef, MappedBuffer, BUFFER_COPY_ALL,
BUFFER_COPY_METADATA,
Buffer, BufferMap, BufferRef, MappedBuffer, BUFFER_COPY_ALL, BUFFER_COPY_METADATA,
};
mod buffer_cursor;
pub use buffer_cursor::{BufferCursor, BufferRefCursor};
pub mod memory;
pub use memory::{MappedMemory, Memory, MemoryMap, MemoryRef};
#[cfg(feature = "ser_de")]