mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-20 17:28:49 +00:00
262 lines
7 KiB
Rust
262 lines
7 KiB
Rust
use libc::{c_char};
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use std::ffi::{CStr, CString};
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use std::ptr;
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use std::u64;
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use std::slice;
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use std::io::{Read, Seek, SeekFrom};
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use std::fs::File;
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use std::path::PathBuf;
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use url::Url;
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use std::io::Write;
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macro_rules! println_err(
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($($arg:tt)*) => { {
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let r = writeln!(&mut ::std::io::stderr(), $($arg)*);
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r.expect("failed printing to stderr");
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} }
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);
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#[repr(C)]
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pub enum GstFlowReturn {
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Ok = 0,
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NotLinked = -1,
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Flushing = -2,
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Eos = -3,
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NotNegotiated = -4,
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Error = -5,
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}
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#[repr(C)]
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pub enum GBoolean {
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False = 0,
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True = 1,
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}
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impl GBoolean {
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fn from_bool(v: bool) -> GBoolean {
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match v {
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true => GBoolean::True,
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false => GBoolean::False,
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}
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}
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}
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pub trait Source {
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fn set_uri(&mut self, uri_str: &Option<String>) -> bool;
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fn get_uri(&self) -> Option<String>;
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fn is_seekable(&self) -> bool;
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fn get_size(&self) -> u64;
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fn start(&mut self) -> bool;
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fn stop(&mut self) -> bool;
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fn fill(&mut self, offset: u64, data: &mut [u8]) -> Result<usize, GstFlowReturn>;
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}
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#[derive(Debug)]
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pub struct FileSrc {
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location: Option<PathBuf>,
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file: Option<File>,
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position: u64,
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}
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impl FileSrc {
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fn new() -> FileSrc {
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FileSrc { location: None, file: None, position: 0 }
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}
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fn new_source() -> Box<Source> {
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Box::new(FileSrc::new())
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}
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}
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impl Source for FileSrc {
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fn set_uri(&mut self, uri_str: &Option<String>) -> bool {
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match *uri_str {
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None => {
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self.location = None;
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return true;
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},
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Some(ref uri_str) => {
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let uri_parsed = Url::parse(uri_str.as_str());
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match uri_parsed {
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Ok(u) => {
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match u.to_file_path().ok() {
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Some(p) => {
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self.location = Some(p);
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return true;
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},
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None => {
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self.location = None;
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println_err!("Unsupported file URI '{}'", uri_str);
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return false;
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}
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}
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},
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Err(err) => {
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self.location = None;
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println_err!("Failed to parse URI '{}': {}", uri_str, err);
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return false;
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}
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}
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}
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}
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}
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fn get_uri(&self) -> Option<String> {
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match self.location {
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None => None,
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Some(ref location) => Url::from_file_path(&location).map(|u| u.into_string()).ok()
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}
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}
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fn is_seekable(&self) -> bool {
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true
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}
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fn get_size(&self) -> u64 {
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match self.file {
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None => return u64::MAX,
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Some(ref f) => {
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return f.metadata().map(|m| m.len()).unwrap_or(u64::MAX);
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},
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}
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}
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fn start(&mut self) -> bool {
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self.file = None;
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self.position = 0;
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match self.location {
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None => return false,
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Some(ref location) => {
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match File::open(location.as_path()) {
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Ok(file) => {
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self.file = Some(file);
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return true;
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},
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Err(err) => {
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println_err!("Failed to open file '{}': {}", location.to_str().unwrap_or("Non-UTF8 path"), err.to_string());
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return false;
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},
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}
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},
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}
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}
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fn stop(&mut self) -> bool {
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self.file = None;
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self.position = 0;
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true
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}
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fn fill(&mut self, offset: u64, data: &mut [u8]) -> Result<usize, GstFlowReturn> {
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match self.file {
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None => return Err(GstFlowReturn::Error),
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Some(ref mut f) => {
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if self.position != offset {
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match f.seek(SeekFrom::Start(offset)) {
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Ok(_) => {
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self.position = offset;
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},
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Err(err) => {
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println_err!("Failed to seek to {}: {}", offset, err.to_string());
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return Err(GstFlowReturn::Error);
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}
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}
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}
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match f.read(data) {
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Ok(size) => {
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self.position += size as u64;
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return Ok(size)
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},
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Err(err) => {
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println_err!("Failed to read at {}: {}", offset, err.to_string());
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return Err(GstFlowReturn::Error);
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},
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}
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},
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}
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}
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}
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#[no_mangle]
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pub extern "C" fn filesrc_new() -> *mut Box<Source> {
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let instance = Box::new(FileSrc::new_source());
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return Box::into_raw(instance);
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}
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#[no_mangle]
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pub extern "C" fn source_drop(ptr: *mut Box<Source>) {
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unsafe { Box::from_raw(ptr) };
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}
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#[no_mangle]
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pub extern "C" fn source_set_uri(ptr: *mut Box<Source>, uri_ptr: *const c_char) -> GBoolean{
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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if uri_ptr.is_null() {
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GBoolean::from_bool(source.set_uri(&None))
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} else {
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let uri = unsafe { CStr::from_ptr(uri_ptr) };
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GBoolean::from_bool(source.set_uri(&Some(String::from(uri.to_str().unwrap()))))
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}
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}
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#[no_mangle]
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pub extern "C" fn source_get_uri(ptr: *mut Box<Source>) -> *mut c_char {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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match source.get_uri() {
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Some(ref uri) =>
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CString::new(uri.clone().into_bytes()).unwrap().into_raw(),
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None =>
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ptr::null_mut()
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}
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}
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#[no_mangle]
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pub extern "C" fn source_fill(ptr: *mut Box<Source>, offset: u64, data_ptr: *mut u8, data_len_ptr: *mut usize) -> GstFlowReturn {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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let mut data_len: &mut usize = unsafe { &mut *data_len_ptr };
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let mut data = unsafe { slice::from_raw_parts_mut(data_ptr, *data_len) };
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match source.fill(offset, data) {
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Ok(actual_len) => {
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*data_len = actual_len;
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GstFlowReturn::Ok
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},
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Err(ret) => ret,
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}
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}
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#[no_mangle]
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pub extern "C" fn source_get_size(ptr: *mut Box<Source>) -> u64 {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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return source.get_size();
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}
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#[no_mangle]
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pub extern "C" fn source_start(ptr: *mut Box<Source>) -> GBoolean {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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GBoolean::from_bool(source.start())
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}
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#[no_mangle]
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pub extern "C" fn source_stop(ptr: *mut Box<Source>) -> GBoolean {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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GBoolean::from_bool(source.stop())
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}
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#[no_mangle]
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pub extern "C" fn source_is_seekable(ptr: *mut Box<Source>) -> GBoolean {
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let source: &mut Box<Source> = unsafe { &mut *ptr };
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GBoolean::from_bool(source.is_seekable())
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}
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