src/noarch/Scaler.cpp (4a1b01f) - Blinker · BlinkenArea

Scaler.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 <iostream>
#include <stdlib.h>
#include <string>

#include <BlinkenLib/BlinkenFrame.h>

#include "CallMgr.h"
#include "Directory.h"
#include "File.h"
#include "Module.h"
#include "Scaler.h"
#include "SettingFile.h"
#include "Size.h"
#include "StreamMgr.h"
#include "StreamRecv.h"

namespace Blinker {

/**
 * @brief constructor
 * @param[in] callMgr callback manager
 * @param[in] streamMgr stream manager
 * @param[in] dirBase base directory
 */
Scaler::Scaler(CallMgr &callMgr, StreamMgr &streamMgr,
                 const Directory &dirBase):
  Module(callMgr, streamMgr, dirBase),
  m_fileInStream(dirBase.getFile("instream")),
  m_fileSize(dirBase.getFile("size")),
  m_fileOutStream(dirBase.getFile("outstream")),
  m_pInStream(NULL),
  m_haveSize(false),
  m_pOutStream(NULL)
{
  // set up
  getInStream();
  getSize();
  getOutStream();
}

/// virtual destructor
Scaler::~Scaler()
{
  // clean up
  releaseInStream();
  releaseOutStream();
}

/// check for update of configuration
void Scaler::updateConfig()
{
  // stream name or size file was modified -> re-get stream or size
  if (m_fileInStream.checkModified()) {
    releaseInStream();
    getInStream();
  }
  if (m_fileSize.checkModified()) {
    getSize();
  }
  if (m_fileOutStream.checkModified()) {
    releaseOutStream();
    getOutStream();
  }
}

/**
 * @brief set current frame
 * @param[in] stream stream name
 * @param[in] pFrame current frame
 */
void Scaler::setFrame(const std::string &stream, stBlinkenFrame *pFrame)
{
  procFrame(pFrame);
  (void)stream; // unused
}

/**
 * @brief set current frame to none
 * @param[in] stream stream name
 */
void Scaler::setNoFrame(const std::string &stream)
{
  procNoFrame();
  (void)stream; // unused
}

/// get input stream and attach to it
void Scaler::getInStream()
{
  // get input stream
  m_fileInStream.getStr(m_nameInStream);
  m_pInStream = &m_streamMgr.refStream(m_nameInStream);

// attach to input stream
  if (m_pInStream)
    m_pInStream->attach(this);
}

/// detach from input stream and release it
void Scaler::releaseInStream()
{
  // detach from input stream
  if (m_pInStream)
    m_pInStream->detach(this);

// unreference stream
  m_pInStream = NULL;
  m_streamMgr.unrefStream(m_nameInStream);
}

/// (re-)get size to scale to
void Scaler::getSize()
{
  std::string strSize;

// read size from size file
  m_haveSize = m_fileSize.getStr(strSize) && m_size.fromStr(strSize);

// send current frame to output stream
  sendFrame();
}

/// get output stream
void Scaler::getOutStream()
{
  // get output stream
  m_fileOutStream.getStr(m_nameOutStream);
  m_pOutStream = &m_streamMgr.refStream(m_nameOutStream);

// send current frame to output stream
  sendFrame();
}

/// release output stream
void Scaler::releaseOutStream()
{
  // send no frame information
  if (m_pOutStream)
    m_pOutStream->setNoFrame();

// unreference stream
  m_pOutStream = NULL;
  m_streamMgr.unrefStream(m_nameOutStream);
}

/// send current frame to output stream
void Scaler::sendFrame()
{
  stBlinkenFrame *pFrame;

// get current frame from input stream and process it
  if (m_pInStream && m_pInStream->getCurFrame(pFrame))
    procFrame(pFrame);
  else
    procNoFrame();
}

/**
 * @brief process frame
 * @param[in] pFrame frame to process
 */
void Scaler::procFrame(stBlinkenFrame *pFrame)
{
  stBlinkenFrame *pProcFrame;

// no output stream -> nothing to do
  if (!m_pOutStream)
    return;

// no size -> pass "no frame"
  if (!m_haveSize) {
    m_pOutStream->setNoFrame();
    return;
  }

// size matches -> pass frame directly
  if ((unsigned int)BlinkenFrameGetWidth(pFrame) == m_size.m_width &&
      (unsigned int)BlinkenFrameGetHeight(pFrame) == m_size.m_height) {
    m_pOutStream->setFrame(pFrame);
    return;
  }

// clone frame
  pProcFrame = BlinkenFrameClone(pFrame);
  if (!pProcFrame){
    m_pOutStream->setNoFrame();
    return;
  }

// scale frame
  BlinkenFrameScale(pProcFrame, m_size.m_height, m_size.m_width);

// pass process frame to output stream
  m_pOutStream->setFrame(pProcFrame);

// free cloned frame
  BlinkenFrameFree(pProcFrame);
}

/// process "no frame"
void Scaler::procNoFrame()
{
  // pass "no frame" to output stream
  if (m_pOutStream)
    m_pOutStream->setNoFrame();
}

} // namespace Blinker

Blinker

implemented scaler module