C++ (Cpp) gst_h263_parse_set_src_caps Beispiele

Beispiel #1

Datei: gsth263parse.c Projekt: dylansong77/gstreamer

static gboolean
gst_h263_parse_check_valid_frame (GstBaseParse * parse,
    GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
  GstH263Parse *h263parse;
  GstBuffer *buffer;
  guint psc_pos, next_psc_pos;

  h263parse = GST_H263_PARSE (parse);
  buffer = frame->buffer;

  if (GST_BUFFER_SIZE (buffer) < 3)
    return FALSE;

  psc_pos = find_psc (buffer, 0);

  if (psc_pos == -1) {
    /* PSC not found, need more data */
    if (GST_BUFFER_SIZE (buffer) > 3)
      psc_pos = GST_BUFFER_SIZE (buffer) - 3;
    else
      psc_pos = 0;
    goto more;
  }

  /* Found the start of the frame, now try to find the end */
  next_psc_pos = psc_pos + 3;
  next_psc_pos = find_psc (buffer, next_psc_pos);

  if (next_psc_pos == -1) {
    if (GST_BASE_PARSE_DRAINING (parse))
      /* FLUSH/EOS, it's okay if we can't find the next frame */
      next_psc_pos = GST_BUFFER_SIZE (buffer);
    else
      goto more;
  }

  /* We should now have a complete frame */

  /* If this is the first frame, parse and set srcpad caps */
  if (h263parse->state == PARSING) {
    H263Params params = { 0, };
    GstFlowReturn res;

    res = gst_h263_parse_get_params (&params, buffer, FALSE, &h263parse->state);
    if (res != GST_FLOW_OK || h263parse->state != GOT_HEADER) {
      GST_WARNING ("Couldn't parse header - setting passthrough mode");
      gst_base_parse_set_passthrough (parse, TRUE);
    } else {
      /* Set srcpad caps since we now have sufficient information to do so */
      gst_h263_parse_set_src_caps (h263parse, &params);
      gst_base_parse_set_passthrough (parse, FALSE);
    }
  }

  *skipsize = psc_pos;
  *framesize = next_psc_pos - psc_pos;

  /* XXX: After getting a keyframe, should we adjust min_frame_size to
   * something smaller so we don't end up collecting too many non-keyframes? */

  GST_DEBUG_OBJECT (h263parse, "found a frame of size %d at pos %d",
      *framesize, *skipsize);

  return TRUE;

more:
  /* ask for best next available */
  *framesize = G_MAXUINT;

  *skipsize = psc_pos;

  return FALSE;
}

Beispiel #2

Datei: gsth263parse.c Projekt: Lachann/gst-plugins-bad

static GstFlowReturn
gst_h263_parse_handle_frame (GstBaseParse * parse,
    GstBaseParseFrame * frame, gint * skipsize)
{
  GstH263Parse *h263parse;
  GstBuffer *buffer;
  guint psc_pos, next_psc_pos;
  gsize size;
  H263Params params = { 0, };
  GstFlowReturn res = GST_FLOW_OK;

  h263parse = GST_H263_PARSE (parse);
  buffer = frame->buffer;
  size = gst_buffer_get_size (buffer);

  if (size < 3) {
    *skipsize = 1;
    return GST_FLOW_OK;
  }

  psc_pos = find_psc (buffer, 0);

  if (psc_pos == -1) {
    /* PSC not found, need more data */
    if (size > 3)
      psc_pos = size - 3;
    else
      psc_pos = 0;
    goto more;
  }

  /* need to skip */
  if (psc_pos > 0)
    goto more;

  /* Found the start of the frame, now try to find the end */
  next_psc_pos = psc_pos + 3;
  next_psc_pos = find_psc (buffer, next_psc_pos);

  if (next_psc_pos == -1) {
    if (GST_BASE_PARSE_DRAINING (parse))
      /* FLUSH/EOS, it's okay if we can't find the next frame */
      next_psc_pos = size;
    else
      goto more;
  }

  /* We should now have a complete frame */

  /* If this is the first frame, parse and set srcpad caps */
  if (h263parse->state == PARSING) {
    res = gst_h263_parse_get_params (&params, buffer, FALSE, &h263parse->state);
    if (res != GST_FLOW_OK || h263parse->state != GOT_HEADER) {
      GST_WARNING ("Couldn't parse header - setting passthrough mode");
      gst_base_parse_set_passthrough (parse, TRUE);
    } else {
      /* Set srcpad caps since we now have sufficient information to do so */
      gst_h263_parse_set_src_caps (h263parse, &params);
      gst_base_parse_set_passthrough (parse, FALSE);
    }
    memset (&params, 0, sizeof (params));
  }

  /* XXX: After getting a keyframe, should we adjust min_frame_size to
   * something smaller so we don't end up collecting too many non-keyframes? */

  GST_DEBUG_OBJECT (h263parse, "found a frame of size %u at pos %u",
      next_psc_pos, psc_pos);

  res = gst_h263_parse_get_params (&params, buffer, TRUE, &h263parse->state);
  if (res != GST_FLOW_OK)
    goto more;

  if (h263parse->state == PASSTHROUGH || h263parse->state == PARSING) {
    /* There's a feature we don't support, or we didn't have enough data to
     * parse the header, which should not be possible. Either way, go into
     * passthrough mode and let downstream handle it if it can. */
    GST_WARNING ("Couldn't parse header - setting passthrough mode");
    gst_base_parse_set_passthrough (parse, TRUE);
    goto more;
  }

  if (gst_h263_parse_is_delta_unit (&params))
    GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
  else
    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);

  return gst_base_parse_finish_frame (parse, frame, next_psc_pos);

more:
  *skipsize = psc_pos;

  return res;
}