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/*
* scanner.c
* Copyright 2012-2016 John Lindgren
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions, and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions, and the following disclaimer in the documentation
* provided with the distribution.
*
* This software is provided "as is" and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising from
* the use of this software.
*/
#include "scanner.h"
#include <glib.h> /* for GThreadPool */
#include "audstrings.h"
#include "cue-cache.h"
#include "i18n.h"
#include "internal.h"
#include "plugins.h"
#include "probe.h"
#include "tuple.h"
#include "vfs.h"
static GThreadPool * pool;
ScanRequest::ScanRequest (const String & filename, int flags, Callback callback,
PluginHandle * decoder, Tuple && tuple) :
filename (filename),
flags (flags),
callback (callback),
decoder (decoder),
tuple (std::move (tuple)),
ip (nullptr)
{
/* If this is a cuesheet entry (and it has not already been loaded), capture
* a reference to the cache immediately. During a playlist scan, requests
* have overlapping lifecycles--each new ScanRequest is created by the
* callback of the previous request--so the cached cuesheet persists as long
* as consecutive playlist entries reference it. */
if (! this->tuple.valid () && is_cuesheet_entry (filename))
cue_cache.capture (new CueCacheRef (strip_subtune (filename)));
}
void ScanRequest::read_cuesheet_entry ()
{
for (auto & item : cue_cache->load ())
{
if (item.filename == filename)
{
decoder = item.decoder;
tuple = item.tuple.ref ();
break;
}
}
}
void ScanRequest::run ()
{
/* load cuesheet entry (possibly cached) */
if (cue_cache)
read_cuesheet_entry ();
/* for a cuesheet entry, determine the source filename */
String audio_file = tuple.get_str (Tuple::AudioFile);
if (! audio_file)
audio_file = filename;
bool need_tuple = (flags & SCAN_TUPLE) && ! tuple.valid ();
bool need_image = (flags & SCAN_IMAGE);
if (! decoder)
decoder = aud_file_find_decoder (audio_file, false, file, & error);
if (! decoder)
goto err;
if (need_tuple || need_image)
{
if (! (ip = load_input_plugin (decoder, & error)))
goto err;
Index<char> * pimage = need_image ? & image_data : nullptr;
if (! aud_file_read_tag (audio_file, decoder, file, tuple, pimage, & error))
goto err;
if ((flags & SCAN_IMAGE) && ! image_data.len ())
image_file = art_search (audio_file);
}
/* rewind/reopen the input file */
if ((flags & SCAN_FILE))
open_input_file (audio_file, "r", ip, file, & error);
else
{
err:
/* close file if not needed or if an error occurred */
file = VFSFile ();
}
callback (this);
}
static void scan_worker (void * data, void *)
{
((ScanRequest *) data)->run ();
delete (ScanRequest *) data;
}
void scanner_init ()
{
pool = g_thread_pool_new (scan_worker, nullptr, SCAN_THREADS, false, nullptr);
}
void scanner_request (ScanRequest * request)
{
g_thread_pool_push (pool, request, nullptr);
}
void scanner_cleanup ()
{
g_thread_pool_free (pool, false, true);
}
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