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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            mov_encoder_thread.cc
 *
 *  Tue May 17 16:00:01 CEST 2005
 *  Copyright  2005 Bent Bisballe
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *    This file is part of MIaV.
 *
 *    MIaV is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    MIaV is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with MIaV; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */

/*
 * $Id$
 */

/*
 * $Log$
 * Revision 1.10  2005/06/14 12:29:40  deva
 * Incorporated the use of the Info object everywhere... also using the log functionality.
 *
 * Revision 1.9  2005/05/26 12:48:36  deva
 * *** empty log message ***
 *
 * Revision 1.8  2005/05/23 17:59:49  deva
 * Fixed delete of NULL input queue
 *
 * Revision 1.7  2005/05/22 15:49:22  deva
 * Added multithreaded encoding support.
 *
 * Revision 1.6  2005/05/19 14:10:22  deva
 *
 * Multithreading rulez?
 *
 * Revision 1.5  2005/05/19 10:55:49  deva
 * Test for block encoding of length strlen("IPIPP").
 *
 * Revision 1.4  2005/05/17 19:16:26  deva
 * Made new mpeg writer work, with proper file permissions.
 *
 * Revision 1.3  2005/05/17 15:13:15  deva
 * *** empty log message ***
 *
 * Revision 1.2  2005/05/17 15:12:51  deva
 * Fixed file rights (All read on files and directories, and all execute on directories).
 *
 * Revision 1.1  2005/05/17 14:30:56  deva
 * Added code, preparing threaded encoding.
 */

#include <config.h>
#include "mov_encoder_thread.h"
#include <errno.h>
#include "miav_config.h"

MovEncoderThread::MovEncoderThread(const char *cpr, Info *i)
{
  info = i;
  outputqueue = new FramePriorityQueue();
  inputqueue = new FrameVectorQueue();
  block = new FrameVector();

  num_frames_in_block = config->readString("frame_sequence")->length();

  info->log("Frame sequence length %d", num_frames_in_block);

  threads = config->readInt("encoding_threads");

  // Thread stuff
	sem_init(&in_sem, 0, 0);
	sem_init(&out_sem, 0, 0);
	sem_init(&read_sem, 0, 0);
  
  for(int cnt = 0; cnt < threads; cnt++) sem_post(&read_sem);

  pthread_mutex_init (&input_mutex, NULL);
  pthread_mutex_init (&output_mutex, NULL);

  writer = new MovEncoderWriter(cpr, outputqueue, &out_sem, &output_mutex, info);
  writer_tid = new pthread_t;
  pthread_create (writer_tid, NULL, thread_run, writer);

  for(int cnt = 0; cnt < threads; cnt++) {
    encs.push_back(new MovEncoder(&read_sem,
                                  inputqueue, &in_sem, &input_mutex,
                                  outputqueue, &out_sem, &output_mutex,
                                  info));
    tids.push_back(new pthread_t);
    pthread_create (tids[cnt], NULL, thread_run, encs[cnt]);
  }

  current_frame = 0;
  frame_number = 0;
}

MovEncoderThread::~MovEncoderThread()
{
  // These should not be deleted here... its done elsewhere.
  //  inputqueue = NULL;

  sem_post(&out_sem);

  // Stop the encoding threads.
  for(int cnt = 0; cnt < threads; cnt++) {
    encs[cnt]->running = false;
  }

  // Kick them to initiate the exit.
  for(int cnt = 0; cnt < threads; cnt++) {
    sem_post(&in_sem);
  }

  // They should be exited now, so we can delete them.
  for(int cnt = 0; cnt < threads; cnt++) {
    pthread_join(*tids[cnt], NULL);
    delete encs[cnt];
    delete tids[cnt];
  }
 
  // Tell the writer to stop
  writer->running = false;

  // Kick it to make it stop.
  sem_post(&out_sem);

  // Destroy the thread
  pthread_join(*writer_tid, NULL);
  delete writer_tid;

  // delete the writer (end thereby close the file)
  delete writer;

  // Destroy the semaphores.
  sem_destroy(&in_sem);
  sem_destroy(&out_sem);
  sem_destroy(&read_sem);
}

void MovEncoderThread::encode(Frame* frame)
{
  if(frame == NULL) {
    info->log("NULL frame detected, exiting.");
    // Terminate
    return;
  }

  frame->number = frame_number;
  block->push_back(frame);

  // Switch frame
  if(block->size() == num_frames_in_block) {
    // Wait until a free encoder.
    /*
    int val;
    sem_getvalue(&read_sem, &val);
    fprintf(stderr, "Sem Value: %d\n", val); fflush(stderr);
    */
    sem_wait(&read_sem);

    // Lock input mutex
    pthread_mutex_lock(&input_mutex);
    inputqueue->push(block);
    pthread_mutex_unlock(&input_mutex);
    // Unlock input mutex

    //    fprintf(stderr, "Frame vector [%d-%d] pushed\n", 
    //           block->at(0)->number, 
    //            block->at(block->size() - 1)->number);
    fflush(stderr);

    // Kick encoders
    sem_post(&in_sem);

    // Start new block
    current_frame = 0;
    block = new FrameVector;
  }

  frame_number ++;
}