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Diffstat (limited to 'src/TagStream.cxx')
-rw-r--r-- | src/TagStream.cxx | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/src/TagStream.cxx b/src/TagStream.cxx new file mode 100644 index 000000000..b84166825 --- /dev/null +++ b/src/TagStream.cxx @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2003-2014 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "TagStream.hxx" +#include "util/UriUtil.hxx" +#include "util/Error.hxx" +#include "decoder/DecoderList.hxx" +#include "decoder/DecoderPlugin.hxx" +#include "input/InputStream.hxx" +#include "thread/Mutex.hxx" +#include "thread/Cond.hxx" + +#include <assert.h> + +/** + * Does the #DecoderPlugin support either the suffix or the MIME type? + */ +gcc_pure +static bool +CheckDecoderPlugin(const DecoderPlugin &plugin, + const char *suffix, const char *mime) +{ + return (mime != nullptr && plugin.SupportsMimeType(mime)) || + (suffix != nullptr && plugin.SupportsSuffix(suffix)); +} + +bool +tag_stream_scan(InputStream &is, const tag_handler &handler, void *ctx) +{ + assert(is.ready); + + const char *const suffix = uri_get_suffix(is.uri.c_str()); + const char *const mime = is.mime.empty() ? nullptr : is.mime.c_str(); + + if (suffix == nullptr && mime == nullptr) + return false; + + return decoder_plugins_try([suffix, mime, &is, + &handler, ctx](const DecoderPlugin &plugin){ + is.LockRewind(IgnoreError()); + + return CheckDecoderPlugin(plugin, suffix, mime) && + plugin.ScanStream(is, handler, ctx); + }); +} + +bool +tag_stream_scan(const char *uri, const tag_handler &handler, void *ctx) +{ + Mutex mutex; + Cond cond; + + InputStream *is = InputStream::OpenReady(uri, mutex, cond, + IgnoreError()); + if (is == nullptr) + return false; + + bool success = tag_stream_scan(*is, handler, ctx); + is->Close(); + return success; +} |