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123 lines
4.4 KiB
123 lines
4.4 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_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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#include <vlc_preparser.h>
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#include <stdexcept>
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Thumbnailer::Thumbnailer( vlc_medialibrary_module_t* ml )
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: m_ml( ml )
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, m_currentContext( nullptr )
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, m_thumbnailer( nullptr, &vlc_preparser_Delete )
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{
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m_thumbnailer.reset( vlc_preparser_New( VLC_OBJECT( ml ), 1,
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VLC_TICK_FROM_SEC( 3 ),
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VLC_PREPARSER_TYPE_THUMBNAIL ) );
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if ( unlikely( m_thumbnailer == nullptr ) )
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throw std::runtime_error( "Failed to instantiate a vlc_preparser_t" );
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}
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void Thumbnailer::onThumbnailComplete( input_item_t *, int, picture_t* thumbnail, void *data )
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{
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ThumbnailerCtx* ctx = static_cast<ThumbnailerCtx*>( data );
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vlc::threads::mutex_locker lock( ctx->thumbnailer->m_mutex );
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ctx->done = true;
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if (thumbnail != nullptr)
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ctx->thumbnail = picture_Hold(thumbnail);
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ctx->thumbnailer->m_currentContext = nullptr;
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ctx->thumbnailer->m_cond.signal();
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}
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bool Thumbnailer::generate( const medialibrary::IMedia&, const std::string& mrl,
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uint32_t desiredWidth, uint32_t desiredHeight,
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float position, const std::string& dest )
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{
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ThumbnailerCtx ctx{};
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auto item = vlc::wrap_cptr( input_item_New( mrl.c_str(), nullptr ),
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&input_item_Release );
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if ( unlikely( item == nullptr ) )
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return false;
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input_item_AddOption( item.get(), "no-hwdec", VLC_INPUT_OPTION_TRUSTED );
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ctx.done = false;
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ctx.thumbnailer = this;
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{
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vlc::threads::mutex_locker lock( m_mutex );
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m_currentContext = &ctx;
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struct vlc_preparser_seek_arg seek_arg = {
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.type = vlc_preparser_seek_arg::VLC_PREPARSER_SEEK_POS,
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.pos = position,
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.speed = vlc_preparser_seek_arg::VLC_PREPARSER_SEEK_FAST,
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};
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static const struct vlc_thumbnailer_cbs cbs = {
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.on_ended = onThumbnailComplete,
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};
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vlc_preparser_req_id requestId =
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vlc_preparser_GenerateThumbnail( m_thumbnailer.get(), item.get(),
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&seek_arg, &cbs, &ctx );
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if (requestId == VLC_PREPARSER_REQ_ID_INVALID)
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{
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m_currentContext = nullptr;
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return false;
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}
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while ( ctx.done == false )
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m_cond.wait( m_mutex );
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m_currentContext = nullptr;
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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, desiredWidth, desiredHeight, 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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auto f = vlc::wrap_cptr( vlc_fopen( dest.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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return true;
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}
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void Thumbnailer::stop()
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{
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vlc::threads::mutex_locker lock{ m_mutex };
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if ( m_currentContext != nullptr )
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{
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m_currentContext->done = true;
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m_cond.signal();
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}
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}
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