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/*
* Copyright 2003-2020 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 "TagStream.hxx"
#include "tag/Generic.hxx"
#include "tag/Handler.hxx"
#include "tag/Builder.hxx"
#include "util/MimeType.hxx"
#include "decoder/DecoderList.hxx"
#include "decoder/DecoderPlugin.hxx"
#include "input/InputStream.hxx"
#include "thread/Mutex.hxx"
#include "util/UriExtract.hxx"
#include <cassert>
/**
* Does the #DecoderPlugin support either the suffix or the MIME type?
*/
gcc_pure
static bool
CheckDecoderPlugin(const DecoderPlugin &plugin,
std::string_view suffix, std::string_view mime) noexcept
{
return (!mime.empty() && plugin.SupportsMimeType(mime)) ||
(!suffix.empty() && plugin.SupportsSuffix(suffix));
}
bool
tag_stream_scan(InputStream &is, TagHandler &handler)
{
assert(is.IsReady());
const auto suffix = uri_get_suffix(is.GetURI());
const char *full_mime = is.GetMimeType();
if (suffix.empty() && full_mime == nullptr)
return false;
std::string_view mime_base{};
if (full_mime != nullptr)
mime_base = GetMimeTypeBase(full_mime);
return decoder_plugins_try([suffix, mime_base, &is,
&handler](const DecoderPlugin &plugin){
try {
is.LockRewind();
} catch (...) {
}
return CheckDecoderPlugin(plugin, suffix, mime_base) &&
plugin.ScanStream(is, handler);
});
}
bool
tag_stream_scan(const char *uri, TagHandler &handler)
{
Mutex mutex;
auto is = InputStream::OpenReady(uri, mutex);
return tag_stream_scan(*is, handler);
}
bool
tag_stream_scan(InputStream &is, TagBuilder &builder,
AudioFormat *audio_format)
{
assert(is.IsReady());
FullTagHandler h(builder, audio_format);
if (!tag_stream_scan(is, h))
return false;
if (builder.empty())
ScanGenericTags(is, h);
return true;
}
bool
tag_stream_scan(const char *uri, TagBuilder &builder,
AudioFormat *audio_format)
{
Mutex mutex;
auto is = InputStream::OpenReady(uri, mutex);
return tag_stream_scan(*is, builder, audio_format);
}
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