/* -*- C -*- */

_TYPE_ *data_in, *data_out, *filter_data;

filter_data = (_TYPE_ *) filter->buffer;
num_filter = filter->buffer_size / sizeof(_TYPE_);

/******************************************************************************/
/* see if we've got any events coming through ... */

do {
  GST_DEBUG(0, "--- going to events");

  while (! filter->eos && GST_IS_EVENT(in)) {
    if (GST_EVENT_TYPE(in) == GST_EVENT_EOS) {
      filter->eos = TRUE;
    } else {
      gst_pad_push(filter->srcpad, in);
    }

    in = gst_pad_pull(filter->sinkpad);
  }

  /******************************************************************************/
  /* first handle data from the input buffer. */

  GST_DEBUG(0, "--- done with events, going to input");

  /* only update the input if there hasn't been an eos yet. */
  if (! filter->eos) {
    data_in = (_TYPE_ *) GST_BUFFER_DATA(in);
    num_in = GST_BUFFER_SIZE(in) / sizeof(_TYPE_);

    w = filter->write;

    /* copy the input data to the filter's internal buffer. */
    if (filter->follow_stream_tail) {
      for (j = 0; j < num_in; j++) {
        filter_data[(w + j) % num_filter] = data_in[j];
      }

      filter->write = (w + j) % num_filter;
      
      /* update the start pointer */
      if ((filter->start != 0) || ((w + j) >= num_filter)) {
        filter->start = (filter->write + 1) % num_filter;
      }
    } else {
      for (j = 0; (j < num_in) && ((w + j) < num_filter); j++) {
        filter_data[w + j] = data_in[j];
      }

      filter->write += j;

      /* if we're not following the stream tail, the buffer is just a straight
         buffer. so we need to set eos if we've passed the limit of the internal
         buffer size. */
      if ((w + j) >= num_filter) {
        filter->eos = TRUE;
      }
    }

    out = in;
  } else {
    j = 0;

    out = gst_buffer_new_from_pool(filter->bufpool, 0, 0);
  }

  /******************************************************************************/
  /* now handle output data. */

  GST_DEBUG(0, "--- done with input, going to output");

  data_out = (_TYPE_ *) GST_BUFFER_DATA(out);
  num_out = GST_BUFFER_SIZE(out) / sizeof(_TYPE_);

  for (k = 0; k < num_out; k++) {
    data_out[k] = zero;
  }
  
  /* output play pointer data. */
  for (t = 0; t < POD_MAX_PLAYS; t++) {
    offset = filter->plays[t];

    if (offset != G_MAXUINT) {
      if (filter->follow_stream_tail) {
        for (k = 0; k < num_out; k++) {
          data_out[k] = CLAMP(data_out[k] + filter_data[(offset + k) % num_filter], min, max);
        }
      } else {
        for (k = 0; (k < num_out) && ((offset + k) < (w + j)); k++) {
          data_out[k] = CLAMP(data_out[k] + filter_data[offset + k], min, max);
        }
      }

      if ((offset < w) && ((offset + k) >= (w + j))) {
        filter->plays[t] = G_MAXUINT;
      } else {
        filter->plays[t] = (filter->plays[t] + k) % num_filter;
      }
    }
  }

  GST_DEBUG(0, "--- done with output, pushing buffer %p", out);

  gst_pad_push(filter->srcpad, out);

  if (! filter->eos) {
    in = gst_pad_pull(filter->sinkpad);
  }
  gst_element_yield (GST_ELEMENT (filter));

} while (TRUE);