111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
/*
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* Copyright 2003-2016 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "TagFile.hxx"
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#include "tag/Generic.hxx"
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#include "tag/TagHandler.hxx"
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#include "tag/TagBuilder.hxx"
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#include "fs/Path.hxx"
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#include "util/Error.hxx"
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#include "decoder/DecoderList.hxx"
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#include "decoder/DecoderPlugin.hxx"
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#include "input/InputStream.hxx"
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#include "input/LocalOpen.hxx"
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#include "thread/Cond.hxx"
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#include <assert.h>
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class TagFileScan {
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const Path path_fs;
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const char *const suffix;
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const TagHandler &handler;
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void *handler_ctx;
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Mutex mutex;
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Cond cond;
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InputStreamPtr is;
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public:
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TagFileScan(Path _path_fs, const char *_suffix,
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const TagHandler &_handler, void *_handler_ctx)
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:path_fs(_path_fs), suffix(_suffix),
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handler(_handler), handler_ctx(_handler_ctx) ,
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is(nullptr) {}
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bool ScanFile(const DecoderPlugin &plugin) {
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return plugin.ScanFile(path_fs, handler, handler_ctx);
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}
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bool ScanStream(const DecoderPlugin &plugin) {
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if (plugin.scan_stream == nullptr)
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return false;
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/* open the InputStream (if not already open) */
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if (is == nullptr) {
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is = OpenLocalInputStream(path_fs,
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mutex, cond,
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IgnoreError());
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if (is == nullptr)
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return false;
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} else
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is->LockRewind(IgnoreError());
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/* now try the stream_tag() method */
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return plugin.ScanStream(*is, handler, handler_ctx);
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}
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bool Scan(const DecoderPlugin &plugin) {
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return plugin.SupportsSuffix(suffix) &&
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(ScanFile(plugin) || ScanStream(plugin));
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}
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};
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bool
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tag_file_scan(Path path_fs, const TagHandler &handler, void *handler_ctx)
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{
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assert(!path_fs.IsNull());
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/* check if there's a suffix and a plugin */
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const auto *suffix = path_fs.GetSuffix();
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if (suffix == nullptr)
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return false;
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const auto suffix_utf8 = Path::FromFS(suffix).ToUTF8();
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TagFileScan tfs(path_fs, suffix_utf8.c_str(), handler, handler_ctx);
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return decoder_plugins_try([&](const DecoderPlugin &plugin){
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return tfs.Scan(plugin);
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});
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}
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bool
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tag_file_scan(Path path, TagBuilder &builder)
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{
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if (!tag_file_scan(path, full_tag_handler, &builder))
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return false;
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if (builder.IsEmpty())
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ScanGenericTags(path, full_tag_handler, &builder);
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return true;
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}
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