gst-plugins-rs/src/rssource.rs

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// Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301, USA.
use libc::c_char;
use std::os::raw::c_void;
use std::ffi::{CStr, CString};
use std::slice;
use std::ptr;
use url::Url;
use utils::*;
use error::*;
#[derive(Debug)]
pub enum SourceError {
Failure,
OpenFailed,
NotFound,
ReadFailed,
SeekFailed,
}
impl ToGError for SourceError {
fn to_gerror(&self) -> (u32, i32) {
match *self {
SourceError::Failure => (gst_library_error_domain(), 1),
SourceError::OpenFailed => (gst_resource_error_domain(), 5),
SourceError::NotFound => (gst_resource_error_domain(), 3),
SourceError::ReadFailed => (gst_resource_error_domain(), 9),
SourceError::SeekFailed => (gst_resource_error_domain(), 11),
}
}
}
#[derive(Debug)]
pub struct SourceController {
source: *mut c_void,
}
impl SourceController {
fn new(source: *mut c_void) -> SourceController {
SourceController { source: source }
}
pub fn error(&self, error: &ErrorMessage) {
extern "C" {
fn gst_rs_source_error(source: *mut c_void,
error_domain: u32,
error_code: i32,
message: *const c_char,
debug: *const c_char,
filename: *const c_char,
function: *const c_char,
line: u32);
}
let ErrorMessage { error_domain,
error_code,
ref message,
ref debug,
filename,
function,
line } = *error;
let message_cstr = message.as_ref().map(|m| CString::new(m.as_bytes()).unwrap());
let message_ptr = message_cstr.as_ref().map_or(ptr::null(), |m| m.as_ptr());
let debug_cstr = debug.as_ref().map(|m| CString::new(m.as_bytes()).unwrap());
let debug_ptr = debug_cstr.as_ref().map_or(ptr::null(), |m| m.as_ptr());
let file_cstr = CString::new(filename.as_bytes()).unwrap();
let file_ptr = file_cstr.as_ptr();
let function_cstr = CString::new(function.as_bytes()).unwrap();
let function_ptr = function_cstr.as_ptr();
unsafe {
gst_rs_source_error(self.source,
error_domain,
error_code,
message_ptr,
debug_ptr,
file_ptr,
function_ptr,
line);
}
}
}
pub trait Source: Sync + Send {
fn get_controller(&self) -> &SourceController;
// Called from any thread at any time
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fn set_uri(&self, uri: Option<Url>) -> Result<(), UriError>;
fn get_uri(&self) -> Option<Url>;
// Called from any thread between start/stop
fn is_seekable(&self) -> bool;
// Called from the streaming thread only
fn start(&self) -> Result<(), ErrorMessage>;
fn stop(&self) -> Result<(), ErrorMessage>;
fn fill(&self, offset: u64, data: &mut [u8]) -> Result<usize, FlowError>;
fn do_seek(&self, start: u64, stop: u64) -> Result<(), ErrorMessage>;
fn get_size(&self) -> u64;
}
#[no_mangle]
pub extern "C" fn source_new(source: *mut c_void,
create_instance: fn(controller: SourceController) -> Box<Source>)
-> *mut Box<Source> {
Box::into_raw(Box::new(create_instance(SourceController::new(source))))
}
#[no_mangle]
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pub unsafe extern "C" fn source_drop(ptr: *mut Box<Source>) {
Box::from_raw(ptr);
}
#[no_mangle]
pub unsafe extern "C" fn source_set_uri(ptr: *mut Box<Source>,
uri_ptr: *const c_char,
cerr: *mut c_void)
-> GBoolean {
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let source: &mut Box<Source> = &mut *ptr;
if uri_ptr.is_null() {
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if let Err(err) = source.set_uri(None) {
err.into_gerror(cerr);
GBoolean::False
} else {
GBoolean::True
}
} else {
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let uri_str = CStr::from_ptr(uri_ptr).to_str().unwrap();
match Url::parse(uri_str) {
Ok(uri) => {
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if let Err(err) = source.set_uri(Some(uri)) {
err.into_gerror(cerr);
GBoolean::False
} else {
GBoolean::True
}
}
Err(err) => {
let _ = source.set_uri(None);
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UriError::new(UriErrorKind::BadUri,
Some(format!("Failed to parse URI '{}': {}", uri_str, err)))
.into_gerror(cerr);
GBoolean::False
}
}
}
}
#[no_mangle]
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pub unsafe extern "C" fn source_get_uri(ptr: *mut Box<Source>) -> *mut c_char {
let source: &mut Box<Source> = &mut *ptr;
match source.get_uri() {
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Some(uri) => CString::new(uri.into_string().into_bytes()).unwrap().into_raw(),
None => ptr::null_mut(),
}
}
#[no_mangle]
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pub unsafe extern "C" fn source_fill(ptr: *mut Box<Source>,
offset: u64,
data_ptr: *mut u8,
data_len_ptr: *mut usize)
-> GstFlowReturn {
let source: &mut Box<Source> = &mut *ptr;
let mut data_len: &mut usize = &mut *data_len_ptr;
let mut data = slice::from_raw_parts_mut(data_ptr, *data_len);
match source.fill(offset, data) {
Ok(actual_len) => {
*data_len = actual_len;
GstFlowReturn::Ok
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}
Err(flow_error) => {
match flow_error {
FlowError::NotNegotiated(ref msg) |
FlowError::Error(ref msg) => source.get_controller().error(msg),
_ => (),
}
flow_error.to_native()
}
}
}
#[no_mangle]
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pub unsafe extern "C" fn source_get_size(ptr: *const Box<Source>) -> u64 {
let source: &Box<Source> = &*ptr;
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source.get_size()
}
#[no_mangle]
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pub unsafe extern "C" fn source_start(ptr: *mut Box<Source>) -> GBoolean {
let source: &mut Box<Source> = &mut *ptr;
match source.start() {
Ok(..) => GBoolean::True,
Err(ref msg) => {
source.get_controller().error(msg);
GBoolean::False
}
}
}
#[no_mangle]
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pub unsafe extern "C" fn source_stop(ptr: *mut Box<Source>) -> GBoolean {
let source: &mut Box<Source> = &mut *ptr;
match source.stop() {
Ok(..) => GBoolean::True,
Err(ref msg) => {
source.get_controller().error(msg);
GBoolean::False
}
}
}
#[no_mangle]
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pub unsafe extern "C" fn source_is_seekable(ptr: *const Box<Source>) -> GBoolean {
let source: &Box<Source> = &*ptr;
GBoolean::from_bool(source.is_seekable())
}
#[no_mangle]
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pub unsafe extern "C" fn source_do_seek(ptr: *mut Box<Source>, start: u64, stop: u64) -> GBoolean {
let source: &mut Box<Source> = &mut *ptr;
match source.do_seek(start, stop) {
Ok(..) => GBoolean::True,
Err(ref msg) => {
source.get_controller().error(msg);
GBoolean::False
}
}
}