src/lyrics.h

   1 /***************************************************************************
   2  *   Copyright (C) 2008-2012 by Andrzej Rybczak                            *
   3  *   electricityispower@gmail.com                                          *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
  19  ***************************************************************************/
  20
  21 #ifndef _LYRICS_H
  22 #define _LYRICS_H
  23
  24 #include <pthread.h>
  25 #include <queue>
  26
  27 #include "mpdpp.h"
  28 #include "screen.h"
  29 #include "lyrics_fetcher.h"
  30
  31 class Lyrics : public Screen<NC::Scrollpad>
  32 {
  33         public:
  34                 Lyrics() : ReloadNP(0),
  35 #               ifdef HAVE_CURL_CURL_H
  36                 isReadyToTake(0), isDownloadInProgress(0),
  37 #               endif // HAVE_CURL_CURL_H
  38                 itsScrollBegin(0) { }
  39
  40                 virtual void Resize();
  41                 virtual void SwitchTo();
  42
  43                 virtual std::basic_string<my_char_t> Title();
  44
  45                 virtual void Update();
  46
  47                 virtual void EnterPressed() { }
  48                 virtual void SpacePressed();
  49
  50                 virtual bool isMergable() { return true; }
  51
  52                 void Edit();
  53
  54 #               ifdef HAVE_CURL_CURL_H
  55                 void Refetch();
  56
  57                 static void ToggleFetcher();
  58                 static void DownloadInBackground(const MPD::Song *s);
  59 #               endif // HAVE_CURL_CURL_H
  60
  61                 bool ReloadNP;
  62
  63         protected:
  64                 virtual void Init();
  65                 virtual bool isLockable() { return false; }
  66
  67         private:
  68                 void Load();
  69
  70 #               ifdef HAVE_CURL_CURL_H
  71                 static void *DownloadInBackgroundImpl(void *);
  72                 static void DownloadInBackgroundImplHelper(MPD::Song *);
  73                 // lock for allowing exclusive access to itsToDownload and itsWorkersNumber
  74                 static pthread_mutex_t itsDIBLock;
  75                 // storage for songs for which lyrics are scheduled to be downloaded
  76                 static std::queue<MPD::Song *> itsToDownload;
  77                 // current worker threads (ie. downloading lyrics)
  78                 static size_t itsWorkersNumber;
  79                 // maximum number of worker threads. if it's reached, next lyrics requests
  80                 // are put into itsToDownload queue.
  81                 static const size_t itsMaxWorkersNumber = 4;
  82
  83                 void *Download();
  84                 static void *DownloadWrapper(void *);
  85                 static void Save(const std::string &filename, const std::string &lyrics);
  86
  87                 void Take();
  88                 bool isReadyToTake;
  89                 bool isDownloadInProgress;
  90                 pthread_t itsDownloader;
  91
  92                 static LyricsFetcher **itsFetcher;
  93 #               endif // HAVE_CURL_CURL_H
  94
  95                 size_t itsScrollBegin;
  96                 MPD::Song itsSong;
  97                 std::string itsFilename;
  98
  99                 static std::string GenerateFilename(const MPD::Song &s);
 100 };
 101
 102 extern Lyrics *myLyrics;
 103
 104 #endif
 105