mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-05-03 00:48:44 +00:00
170 lines
5.3 KiB
Rust
170 lines
5.3 KiB
Rust
// Copyright (C) 2016-2017 Sebastian Dröge <sebastian@centricular.com>
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::u64;
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use std::io::{Read, Seek, SeekFrom};
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use std::fs::File;
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use url::Url;
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use gst_plugin::error::*;
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use gst_plugin::source::*;
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use gst_plugin::buffer::*;
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use gst_plugin::log::*;
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use gst_plugin::utils::*;
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use slog::*;
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#[derive(Debug)]
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enum StreamingState {
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Stopped,
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Started { file: File, position: u64 },
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}
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#[derive(Debug)]
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pub struct FileSrc {
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streaming_state: StreamingState,
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logger: Logger,
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}
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impl FileSrc {
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pub fn new(element: Element) -> FileSrc {
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FileSrc {
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streaming_state: StreamingState::Stopped,
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logger: Logger::root(GstDebugDrain::new(Some(&element),
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"rsfilesrc",
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0,
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"Rust file source"),
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None),
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}
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}
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pub fn new_boxed(element: Element) -> Box<Source> {
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Box::new(FileSrc::new(element))
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}
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}
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fn validate_uri(uri: &Url) -> Result<(), UriError> {
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let _ = try!(uri.to_file_path()
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.or_else(|_| {
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Err(UriError::new(UriErrorKind::UnsupportedProtocol,
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Some(format!("Unsupported file URI '{}'", uri.as_str()))))
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}));
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Ok(())
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}
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impl Source for FileSrc {
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fn uri_validator(&self) -> Box<UriValidator> {
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Box::new(validate_uri)
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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) -> Option<u64> {
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if let StreamingState::Started { ref file, .. } = self.streaming_state {
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file.metadata()
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.ok()
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.map(|m| m.len())
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} else {
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None
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}
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}
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fn start(&mut self, uri: Url) -> Result<(), ErrorMessage> {
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if let StreamingState::Started { .. } = self.streaming_state {
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return Err(error_msg!(SourceError::Failure, ["Source already started"]));
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}
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let location = try!(uri.to_file_path()
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.or_else(|_| {
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error!(self.logger, "Unsupported file URI '{}'", uri.as_str());
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Err(error_msg!(SourceError::Failure,
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["Unsupported file URI '{}'", uri.as_str()]))
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}));
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let file = try!(File::open(location.as_path()).or_else(|err| {
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error!(self.logger,
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"Could not open file for reading: {}",
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err.to_string());
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Err(error_msg!(SourceError::OpenFailed,
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["Could not open file for reading '{}': {}",
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location.to_str().unwrap_or("Non-UTF8 path"),
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err.to_string()]))
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}));
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debug!(self.logger, "Opened file {:?}", file);
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self.streaming_state = StreamingState::Started {
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file: file,
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position: 0,
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};
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Ok(())
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}
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fn stop(&mut self) -> Result<(), ErrorMessage> {
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self.streaming_state = StreamingState::Stopped;
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Ok(())
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}
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fn fill(&mut self, offset: u64, _: u32, buffer: &mut Buffer) -> Result<(), FlowError> {
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// FIXME: Because we borrow streaming state mutably below
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let logger = self.logger.clone();
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let (file, position) = match self.streaming_state {
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StreamingState::Started { ref mut file, ref mut position } => (file, position),
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StreamingState::Stopped => {
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return Err(FlowError::Error(error_msg!(SourceError::Failure, ["Not started yet"])));
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}
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};
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if *position != offset {
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try!(file.seek(SeekFrom::Start(offset)).or_else(|err| {
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error!(logger, "Failed to seek to {}: {:?}", offset, err);
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Err(FlowError::Error(error_msg!(SourceError::SeekFailed,
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["Failed to seek to {}: {}",
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offset,
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err.to_string()])))
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}));
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*position = offset;
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}
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let size = {
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let mut map = match buffer.map_readwrite() {
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None => {
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return Err(FlowError::Error(error_msg!(SourceError::Failure,
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["Failed to map buffer"])));
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}
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Some(map) => map,
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};
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let data = map.as_mut_slice();
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try!(file.read(data).or_else(|err| {
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error!(logger, "Failed to read: {:?}", err);
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Err(FlowError::Error(error_msg!(SourceError::ReadFailed,
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["Failed to read at {}: {}",
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offset,
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err.to_string()])))
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}))
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};
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*position += size as u64;
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buffer.set_size(size);
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Ok(())
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}
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fn seek(&mut self, _: u64, _: Option<u64>) -> Result<(), ErrorMessage> {
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Ok(())
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}
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}
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