PL286/hardware/qcom/media/msm8974/mm-video-legacy/vidc/venc/test/queue.c

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--------------------------------------------------------------------------*/
#include "queue.h"

int check_if_queue_empty ( unsigned int queuetocheck, void* queuecontext )
{
	struct video_queue_context *ptr_q = NULL;
    /*
	 * queuetocheck - 0 command queue
	 * queuetocheck - 1 data queue
	 */
	if ( queuecontext == NULL || (queuetocheck > 1 ) )
	{
		return 1;
	}
    ptr_q = (struct video_queue_context *)queuecontext;

	if (queuetocheck == 0)
	{
      if (ptr_q->read_comq == ptr_q->write_comq)
	  {
		  return 1;
	  }
	}
	else if (queuetocheck == 1)
	{
		if (ptr_q->write_dataq == ptr_q->read_dataq)
		{
			return 1;
		}
	}

    return 0;
}



struct video_msgq * queue_get_cmd (void* queuecontext )
{
    struct video_queue_context *ptr_q = NULL;
	struct video_msgq *pitem = NULL;

    if( NULL == queuecontext )
    {
        printf("\n queue_get_cmd: Invalid Input parameter\n");
        return NULL;
    }

    ptr_q = (struct video_queue_context *)queuecontext;

    /* Wait on the semaphore till it is released */
    sem_wait(&ptr_q->sem_message);

    /* Lock the mutex to protect the critical section */
    pthread_mutex_lock(&ptr_q->mutex);

    if (ptr_q->read_comq != ptr_q->write_comq)
    {
        pitem = &ptr_q->ptr_cmdq [ptr_q->read_comq];
        ptr_q->read_comq = (ptr_q->read_comq + 1) % \
			                ptr_q->commandq_size;
    }
    else if (ptr_q->write_dataq != ptr_q->read_dataq)
	{
        pitem = &ptr_q->ptr_dataq [ptr_q->read_dataq];
		ptr_q->read_dataq = (ptr_q->read_dataq + 1) % \
			                ptr_q->dataq_size;
	}

    /* Unlock the mutex to release the critical section */
    pthread_mutex_unlock(&ptr_q->mutex);

    return pitem;
}


int queue_post_cmdq ( void* queuecontext,
                     struct video_msgq *pitem
                     )
{
    struct video_queue_context *ptr_q = NULL;

	if (pitem == NULL || queuecontext == NULL)
	{
		return -1;
	}
    ptr_q = (struct video_queue_context *)queuecontext;

    /* Lock the mutex to protect the critical section */
    pthread_mutex_lock(&ptr_q->mutex);

    if ((ptr_q->write_comq + 1) % ptr_q->commandq_size == ptr_q->read_comq)
    {
        printf("\n QUEUE is FULL");
		return 0;
    }
    else
    {
        /* Store the command in the Message Queue & increment write offset */
		memcpy ( &ptr_q->ptr_cmdq [ptr_q->write_comq],pitem, \
				 sizeof (struct video_msgq));
        ptr_q->write_comq = (ptr_q->write_comq + 1) % ptr_q->commandq_size;
    }

    /* Unlock the mutex to release the critical section */
    pthread_mutex_unlock(&ptr_q->mutex);

    /* Post the semaphore */
    sem_post(&ptr_q->sem_message);
	return 1;
}


int queue_post_dataq ( void *queuecontext,
                       struct video_msgq *pitem
                      )
{
	struct video_queue_context *ptr_q = NULL;

	if (pitem == NULL || queuecontext == NULL)
	{
		return -1;
	}
	ptr_q = (struct video_queue_context *)queuecontext;

	/* Lock the mutex to protect the critical section */
	pthread_mutex_lock(&ptr_q->mutex);

	if ((ptr_q->write_dataq + 1) % ptr_q->dataq_size == ptr_q->read_dataq)
	{
		printf("\n QUEUE is FULL");
		return 0;
	}
	else
	{
		/* Store the command in the Message Queue & increment write offset */
		memcpy ( &ptr_q->ptr_dataq [ptr_q->write_dataq],pitem, \
				 sizeof (struct video_msgq));
		ptr_q->write_dataq = (ptr_q->write_dataq + 1) % ptr_q->dataq_size;
	}

	/* Unlock the mutex to release the critical section */
	pthread_mutex_unlock(&ptr_q->mutex);

	/* Post the semaphore */
	sem_post(&ptr_q->sem_message);
	return 1;

}