src/noarch/Player.cpp (f0c104c) - Blinker · BlinkenArea

Player.cpp

/* Blinker
   Copyright 2011 Stefan Schuermans <stefan@blinkenarea.org>
   Copyleft GNU public license - http://www.gnu.org/copyleft/gpl.html
   a blinkenarea.org project */

#include <list>
#include <string>

#include <BlinkenLib/BlinkenFrame.h>
#include <BlinkenLib/BlinkenMovie.h>

#include "CallMgr.h"
#include "Directory.h"
#include "File.h"
#include "Module.h"
#include "OutStreamFile.h"
#include "Player.h"
#include "StreamMgr.h"
#include "Time.h"
#include "TimeCallee.h"

namespace Blinker {

/**
 * @brief constructor
 * @param[in] callMgr callback manager
 * @param[in] streamMgr stream manager
 * @param[in] dirBase base directory
 */
Player::Player(CallMgr &callMgr, StreamMgr &streamMgr,
               const Directory &dirBase):
  Module(callMgr, streamMgr, dirBase),
  m_fileOutStream(dirBase.getFile("outstream"), streamMgr),
  m_dirPlaylist(dirBase.getSubdir("playlist")),
  m_curValid(false),
  m_curEntry(m_playlist.begin()),
  m_curFrame(0)
{
  // load playlist
  updatePlaylistFull();
}

/// virtual destructor
Player::~Player()
{
  // cancel time callback request
  m_callMgr.cancelTimeCall(this);

// free all movies
  while (!m_playlist.empty()) {
    m_playlist.back().freeMovie();
    m_playlist.pop_back();
  }
}

/// check for update of configuration
void Player::updateConfig()
{
  // output stream name file was modified -> re-get output stream
  if (m_fileOutStream.checkModified()) {
    m_fileOutStream.update();
    sendFrame();
  }

// playlist update (directory modified -> full, otherwise -> light)
  if (m_dirPlaylist.checkModified())
    updatePlaylistFull();
  else
    updatePlaylistLight();
}

/// callback when requsted time reached
void Player::timeCall()
{
  // leave if time is not yet ready to next frame
  if (Time::now() < m_nextTime) {
    // request call at time for next frame
    m_callMgr.requestTimeCall(this, m_nextTime);
    return;
  }

// go to next frame
  ++m_curFrame;

// process new current frame
  procFrame();
}

/// light update of playlist, i.e. stat all files in current playlist
void Player::updatePlaylistLight()
{
  // walk through all files in playlist and check for modification
  Playlist::iterator itEntry = m_playlist.begin();
  bool               bCurChg = false;
  while (itEntry != m_playlist.end()) {

// movie changed
    if (itEntry->m_file.checkModified()) {
      // check if changed movie is current movie
      if (itEntry == m_curEntry) {
        // advance current movie to next movie
        ++m_curEntry;
        bCurChg = true;
      }
      // re-load entry
      itEntry->freeMovie();
      if (!itEntry->loadMovie()) {
        // loading movie failed -> remove entry
        itEntry = m_playlist.erase(itEntry);
        // do not advance to next file
        continue;
      }
    }

// advance to next file
    ++itEntry;

} // while itEntry

// current movie entry changed
  if (bCurChg) {
    // go to begin of new current movie and start playing now
    m_curFrame = 0;
    m_nextTime = Time::now();
    procFrame();
  }
}

/// full update of playlist, i.e. scan files in playlist directory
void Player::updatePlaylistFull()
{
  // get list of files in playlist directory
  typedef std::list<std::string> Filelist;
  Filelist curFiles;
  m_dirPlaylist.getEntries(Directory::TypeFile, curFiles);

// walk through current playlist and file list simultaneously
  bool                     bWasEmpty = m_playlist.empty();
  Filelist::const_iterator itFile    = curFiles.begin();
  Playlist::iterator       itEntry   = m_playlist.begin();
  bool                     bCurChg   = false;
  while (itFile != curFiles.end() || itEntry != m_playlist.end()) {

// new movie inserted
    if (itEntry == m_playlist.end() ||
        (itFile != curFiles.end() && *itFile < itEntry->m_name)) {
      // load movie
      Entry entry(*itFile, m_dirPlaylist.getFile(*itFile));
      if (entry.loadMovie())
        // insert playlist entry
        m_playlist.insert(itEntry, entry);
      // advance to next file
      ++itFile;
    }

// movie removed
    // movie changed (=> remove and re-insert in next iteration)
    else if (itFile == curFiles.end() || *itFile > itEntry->m_name ||
             itEntry->m_file.checkModified()) {
      // check if movie to remove is current movie
      if (itEntry == m_curEntry) {
        // advance current movie to next movie
        ++m_curEntry;
        bCurChg = true;
      }
      // remove entry
      itEntry->freeMovie();
      itEntry = m_playlist.erase(itEntry);
      // do not advance to next file
    }

// movie stayed in playlist and did not change
    else {
      // advance to next file and next entry
      ++itFile;
      ++itEntry;
    }

} // while itFile itEntry

// current movie entry changed - or - playlist was empty and is not now
  if (bCurChg || (bWasEmpty && !m_playlist.empty())) {
    // go to begin of new current movie and start playing now
    m_curFrame = 0;
    m_nextTime = Time::now();
    procFrame();
  }
}

/// process current frame
void Player::procFrame()
{
  // movie finished -> next movie
  //   use while loops to handle empty movies / empty playlist
  m_curValid = true;
  bool wrapped = false;
  while (true) {
    // playlist finished -> re-start from beginning
    while (m_curEntry == m_playlist.end()) {
      m_curEntry = m_playlist.begin();
      m_curFrame = 0;
      // detect empty playlist or playlist with only empty movies
      if (wrapped) {
        m_curValid = false;
        break;
      }
      wrapped = true;
    }
    if (!m_curValid)
      break;
    // movie not yet finished -> done
    if (m_curFrame < BlinkenMovieGetFrameCnt(m_curEntry->m_pMovie))
      break;
    // movie finished -> next movie
    ++m_curEntry;
    m_curFrame = 0;
  }

// send new frame to stream
  sendFrame();

// if a frame is there
  if (m_curValid) {
    // calculate time for next frame
    stBlinkenFrame *pFrame =
      BlinkenMovieGetFrame(m_curEntry->m_pMovie, m_curFrame);
    Time duration;
    duration.fromMs(BlinkenFrameGetDuration(pFrame));
    m_nextTime += duration;
    // request call at time for next frame
    m_callMgr.requestTimeCall(this, m_nextTime);
  }
}

/// send current frame to output stream
void Player::sendFrame()
{
  // frame avalable -> send it
  if (m_curValid) {
    stBlinkenFrame *pFrame =
      BlinkenMovieGetFrame(m_curEntry->m_pMovie, m_curFrame);
    m_fileOutStream.setFrame(pFrame);
  }
  // no frame available -> send this information
  else
    m_fileOutStream.setFrame(NULL);
}

/* #################
   # Player::Entry #
   ################# */

/// constructor
Player::Entry::Entry(const std::string &name, const File &file):
  m_name(name),
  m_file(file),
  m_pMovie(NULL)
{
}

/// load movie from current file
bool Player::Entry::loadMovie()
{
  freeMovie();
  m_pMovie = BlinkenMovieLoad(m_file.getPath().c_str());
  return m_pMovie;
}

/// free current movie
void Player::Entry::freeMovie()
{
  if (m_pMovie) {
    BlinkenMovieFree(m_pMovie);
    m_pMovie = NULL;
  }
}

} // namespace Blinker

Blinker

implemented specialized setting files for different data types, simplified input/output stream handling in modules