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110 lines
3.9 KiB
110 lines
3.9 KiB
/*****************************************************************************
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* Thumbnailer.cpp: medialibrary thumbnailer implementation using libvlccore
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*****************************************************************************
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* Copyright © 2018 VLC authors, VideoLAN and VideoLabs
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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 Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "medialibrary.h"
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#include <vlc_thumbnailer.h>
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#include <vlc_fs.h>
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#include <vlc_block.h>
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#include <vlc_url.h>
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#include <vlc_cxx_helpers.hpp>
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Thumbnailer::Thumbnailer( vlc_medialibrary_module_t* ml, std::string thumbnailsDir )
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: m_ml( ml )
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, m_thumbnailDir( std::move( thumbnailsDir ) )
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, m_thumbnailer( nullptr, &vlc_thumbnailer_Release )
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{
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m_thumbnailer.reset( vlc_thumbnailer_Create( VLC_OBJECT( ml ) ) );
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if ( unlikely( m_thumbnailer == nullptr ) )
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throw std::runtime_error( "Failed to instantiate a vlc_thumbnailer_t" );
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}
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struct ThumbnailerCtx
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{
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~ThumbnailerCtx()
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{
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if ( item != nullptr )
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input_item_Release( item );
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if ( thumbnail != nullptr )
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picture_Release( thumbnail );
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}
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vlc::threads::condition_variable cond;
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vlc::threads::mutex mutex;
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input_item_t* item;
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bool done;
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picture_t* thumbnail;
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};
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static void onThumbnailComplete( void* data, picture_t* thumbnail )
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{
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ThumbnailerCtx* ctx = static_cast<ThumbnailerCtx*>( data );
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{
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vlc::threads::mutex_locker lock( ctx->mutex );
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ctx->done = true;
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ctx->thumbnail = thumbnail ? picture_Hold( thumbnail ) : nullptr;
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}
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ctx->cond.signal();
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}
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bool Thumbnailer::generate( medialibrary::MediaPtr media, const std::string& mrl )
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{
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ThumbnailerCtx ctx{};
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ctx.item = input_item_New( mrl.c_str(), media->title().c_str() );
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if ( unlikely( ctx.item == nullptr ) )
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return false;
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input_item_AddOption( ctx.item, "no-hwdec", VLC_INPUT_OPTION_TRUSTED );
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ctx.done = false;
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{
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vlc::threads::mutex_locker lock( ctx.mutex );
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vlc_thumbnailer_RequestByPos( m_thumbnailer.get(), .3f,
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VLC_THUMBNAILER_SEEK_FAST, ctx.item,
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VLC_TICK_FROM_SEC( 3 ),
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&onThumbnailComplete, &ctx );
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while ( ctx.done == false )
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ctx.cond.wait( ctx.mutex );
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}
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if ( ctx.thumbnail == nullptr )
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return false;
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block_t* block;
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if ( picture_Export( VLC_OBJECT( m_ml ), &block, nullptr, ctx.thumbnail,
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VLC_CODEC_JPEG, 512, 320, true ) != VLC_SUCCESS )
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return false;
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auto blockPtr = vlc::wrap_cptr( block, &block_Release );
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std::string outputPath = m_thumbnailDir + std::to_string( media->id() ) + ".jpg";
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auto f = vlc::wrap_cptr( vlc_fopen( outputPath.c_str(), "wb" ), &fclose );
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if ( f == nullptr )
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return false;
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if ( fwrite( block->p_buffer, block->i_buffer, 1, f.get() ) != 1 )
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return false;
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auto thumbnailMrl = vlc::wrap_cptr( vlc_path2uri( outputPath.c_str(), nullptr ) );
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if ( thumbnailMrl == nullptr )
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return false;
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return media->setThumbnail( thumbnailMrl.get() );
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}
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