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/*
* Copyright (C) 2012 Intel Corporation.
* Copyright (C) 2013 Cable Television Laboratories, Inc.
*
* Author: Jens Georg <jensg@openismus.com>
* Craig Pratt <craig@ecaspia.com>
*
* This file is part of Rygel.
*
* Rygel is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Rygel 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* A simple data source for use with the simple media engine (RygelSimpleMediaEngine).
*
* This does not support time-base seeking with
* rygel_data_source_start() because it does not
* use any multimedia framework. Therefore, calling start() with
* RYGEL_HTTP_SEEK_TYPE_TIME will fail with a
* RYGEL_DATA_SOURCE_ERROR_SEEK_FAILED GError code,
*/
internal class Rygel.SimpleDataSource : DataSource, Object {
private string uri;
private Thread<void*> thread;
private Mutex mutex = Mutex ();
private Cond cond = Cond ();
private Posix.off_t first_byte = 0;
private Posix.off_t last_byte = 0;
private bool frozen = false;
private bool stop_thread = false;
private unowned ThreadPool<SimpleDataSource> pool;
public SimpleDataSource (ThreadPool<SimpleDataSource>? pool,
string uri) {
debug ("Creating new data source for %s", uri);
this.uri = uri;
this.pool = pool;
}
~SimpleDataSource () {
this.stop ();
}
public Gee.List<HTTPResponseElement>? preroll (HTTPSeekRequest? seek_request,
PlaySpeedRequest? playspeed_request)
throws Error {
var response_list = new Gee.ArrayList<HTTPResponseElement> ();
if (seek_request != null) {
if (!(seek_request is HTTPByteSeekRequest)) {
throw new DataSourceError.SEEK_FAILED
(_("Only byte-based seek supported"));
}
var byte_seek = seek_request as HTTPByteSeekRequest;
this.first_byte = (Posix.off_t) byte_seek.start_byte;
this.last_byte = (Posix.off_t) (byte_seek.end_byte + 1);
debug ("Processing byte seek request for bytes %lld-%lld of %s",
byte_seek.start_byte,
byte_seek.end_byte,
this.uri);
var seek_response = new HTTPByteSeekResponse.from_request (byte_seek);
// Response will just return what was in the request
response_list.add (seek_response);
} else {
this.first_byte = 0;
this.last_byte = 0; // Indicates the entire file
}
if (playspeed_request != null) {
throw new DataSourceError.PLAYSPEED_FAILED
(_("Playspeed not supported"));
}
return response_list;
}
public void start () throws Error {
debug ("Starting data source for uri %s", this.uri);
if (this.pool != null) {
this.pool.add (this);
} else {
this.thread = new Thread<void*> ("Rygel Serving Thread",
this.thread_func);
}
}
public void freeze () {
this.mutex.lock ();
if (!this.frozen) {
this.frozen = true;
}
this.mutex.unlock ();
}
public void thaw () {
this.mutex.lock ();
if (this.frozen) {
this.frozen = false;
this.cond.broadcast ();
}
this.mutex.unlock ();
}
public void stop () {
this.mutex.lock ();
if (!this.stop_thread) {
this.frozen = false;
this.stop_thread = true;
this.cond.broadcast ();
}
this.mutex.unlock ();
}
internal static void pool_func (owned SimpleDataSource data) {
data.run ();
}
private void* thread_func () {
this.run ();
return null;
}
private void run () {
var file = File.new_for_commandline_arg (this.uri);
debug ("Spawning new thread for streaming file %s", this.uri);
int fd = -1;
try {
fd = Posix.open (file.get_path (), Posix.O_RDONLY, 0);
if (fd < 0) {
throw new IOError.FAILED ("Failed to open file '%s': %s",
file.get_path (),
Posix.strerror (Posix.errno));
}
if (this.last_byte == 0) {
this.last_byte = Posix.lseek (fd, 0, Posix.SEEK_END);
if (this.last_byte < 0) {
throw IOError.from_errno (errno);
}
if (Posix.lseek (fd, 0, Posix.SEEK_SET) < 0) {
throw IOError.from_errno (errno);
}
}
if (this.first_byte != 0) {
if (Posix.lseek (fd, this.first_byte, Posix.SEEK_SET) < 0)
throw IOError.from_errno (errno);
}
while (true) {
bool exit;
this.mutex.lock ();
while (this.frozen) {
this.cond.wait (this.mutex);
}
exit = this.stop_thread;
this.mutex.unlock ();
if (exit || this.first_byte == this.last_byte) {
debug ("Done streaming!");
break;
}
var start = this.first_byte;
var stop = start + uint16.MAX;
if (stop > this.last_byte) {
stop = this.last_byte;
}
var slice = new uint8[stop - start];
var len = (int) Posix.read (fd, slice, slice.length);
if (len < 0) {
throw new IOError.FAILED ("Failed to read file '%s': %s",
file.get_path (),
Posix.strerror (Posix.errno));
}
slice.length = len;
this.first_byte = stop;
// There's a potential race condition here.
Idle.add ( () => {
if (!this.stop_thread) {
this.data_available (slice);
}
return false;
});
}
} catch (Error error) {
warning ("Failed to stream file %s: %s",
file.get_path (),
error.message);
} finally {
Posix.close (fd);
}
// Signal that we're done streaming
Idle.add ( () => { this.done (); return false; });
}
}
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