C++ (Cpp) ivtv_start_capture Examples

Example #1

File: ivtv-fileops.c Project: BackupTheBerlios/grasshopper-svn

unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
{
	struct ivtv_open_id *id = filp->private_data;
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);

	/* Start a capture if there is none */
	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
		int rc;

		mutex_lock(&itv->serialize_lock);
		rc = ivtv_start_capture(id);
		mutex_unlock(&itv->serialize_lock);
		if (rc) {
			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
					s->name, rc);
			return POLLERR;
		}
		IVTV_DEBUG_FILE("Encoder poll started capture\n");
	}

	/* add stream's waitq to the poll list */
	IVTV_DEBUG_HI_FILE("Encoder poll\n");
	poll_wait(filp, &s->waitq, wait);

	if (eof || s->q_full.length)
		return POLLIN | POLLRDNORM;
	return 0;
}

Example #2

File: ivtv-fileops.c Project: ARMWorks/FA_2451_Linux_Kernel

ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
{
	struct ivtv_open_id *id = fh2id(filp->private_data);
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int rc;

	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);

	rc = ivtv_start_capture(id);
	if (rc)
		return rc;
	return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
}

Example #3

File: ivtv-fileops.c Project: AlexShiLucky/linux

ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
{
	struct ivtv_open_id *id = fh2id(filp->private_data);
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	ssize_t rc;

	IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);

	if (mutex_lock_interruptible(&itv->serialize_lock))
		return -ERESTARTSYS;
	rc = ivtv_start_capture(id);
	if (!rc)
		rc = ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
	mutex_unlock(&itv->serialize_lock);
	return rc;
}

Example #4

File: ivtv-fileops.c Project: AlexShiLucky/linux

__poll_t ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
{
	__poll_t req_events = poll_requested_events(wait);
	struct ivtv_open_id *id = fh2id(filp->private_data);
	struct ivtv *itv = id->itv;
	struct ivtv_stream *s = &itv->streams[id->type];
	int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
	__poll_t res = 0;

	/* Start a capture if there is none */
	if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
			s->type != IVTV_ENC_STREAM_TYPE_RAD &&
			(req_events & (EPOLLIN | EPOLLRDNORM))) {
		int rc;

		mutex_lock(&itv->serialize_lock);
		rc = ivtv_start_capture(id);
		mutex_unlock(&itv->serialize_lock);
		if (rc) {
			IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
					s->name, rc);
			return EPOLLERR;
		}
		IVTV_DEBUG_FILE("Encoder poll started capture\n");
	}

	/* add stream's waitq to the poll list */
	IVTV_DEBUG_HI_FILE("Encoder poll\n");
	poll_wait(filp, &s->waitq, wait);
	if (v4l2_event_pending(&id->fh))
		res |= EPOLLPRI;
	else
		poll_wait(filp, &id->fh.wait, wait);

	if (s->q_full.length || s->q_io.length)
		return res | EPOLLIN | EPOLLRDNORM;
	if (eof)
		return res | EPOLLHUP;
	return res;
}