C++ (Cpp) gst_pngdec_libpng_init Examples

Example #1

File: gstpngdec.c Project: JJCG/gst-plugins-good

static GstStateChangeReturn
gst_pngdec_change_state (GstElement * element, GstStateChange transition)
{
  GstStateChangeReturn ret;
  GstPngDec *pngdec;

  pngdec = GST_PNGDEC (element);

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      gst_pngdec_libpng_init (pngdec);
      pngdec->need_newsegment = TRUE;
      pngdec->framed = FALSE;
      pngdec->ret = GST_FLOW_OK;
      gst_segment_init (&pngdec->segment, GST_FORMAT_UNDEFINED);
      break;
    default:
      break;
  }

  ret = parent_class->change_state (element, transition);
  if (ret != GST_STATE_CHANGE_SUCCESS)
    return ret;

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_pngdec_libpng_clear (pngdec);
      break;
    default:
      break;
  }

  return ret;
}

Example #2

File: gstpngdec.c Project: JJCG/gst-plugins-good

static gboolean
gst_pngdec_sink_event (GstPad * pad, GstEvent * event)
{
  GstPngDec *pngdec;
  gboolean res;

  pngdec = GST_PNGDEC (gst_pad_get_parent (pad));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_NEWSEGMENT:{
      gdouble rate, arate;
      gboolean update;
      gint64 start, stop, position;
      GstFormat fmt;

      gst_event_parse_new_segment_full (event, &update, &rate, &arate, &fmt,
          &start, &stop, &position);

      gst_segment_set_newsegment_full (&pngdec->segment, update, rate, arate,
          fmt, start, stop, position);

      GST_LOG_OBJECT (pngdec, "NEWSEGMENT (%s)", gst_format_get_name (fmt));

      if (fmt == GST_FORMAT_TIME) {
        pngdec->need_newsegment = FALSE;
        res = gst_pad_push_event (pngdec->srcpad, event);
      } else {
        gst_event_unref (event);
        res = TRUE;
      }
      break;
    }
    case GST_EVENT_FLUSH_STOP:
    {
      gst_pngdec_libpng_clear (pngdec);
      gst_pngdec_libpng_init (pngdec);
      png_set_progressive_read_fn (pngdec->png, pngdec,
          user_info_callback, user_endrow_callback, user_end_callback);
      pngdec->ret = GST_FLOW_OK;
      gst_segment_init (&pngdec->segment, GST_FORMAT_UNDEFINED);
      res = gst_pad_push_event (pngdec->srcpad, event);
      break;
    }
    case GST_EVENT_EOS:
    {
      GST_LOG_OBJECT (pngdec, "EOS");
      gst_pngdec_libpng_clear (pngdec);
      pngdec->ret = GST_FLOW_UNEXPECTED;
      res = gst_pad_push_event (pngdec->srcpad, event);
      break;
    }
    default:
      res = gst_pad_push_event (pngdec->srcpad, event);
      break;
  }

  gst_object_unref (pngdec);
  return res;
}

Example #3

File: gstpngdec.c Project: DylanZA/gst-plugins-good

/* Clean up the libpng structures */
static gboolean
gst_pngdec_flush (GstVideoDecoder * decoder)
{
  gst_pngdec_libpng_clear ((GstPngDec *) decoder);
  gst_pngdec_libpng_init ((GstPngDec *) decoder);

  return TRUE;
}

Example #4

File: gstpngdec.c Project: lubing521/gst-embedded-builder

/* Clean up the libpng structures */
static gboolean
gst_pngdec_reset (GstVideoDecoder * decoder, gboolean hard)
{
  gst_pngdec_libpng_clear ((GstPngDec *) decoder);
  gst_pngdec_libpng_init ((GstPngDec *) decoder);

  return TRUE;
}

Example #5

File: gstpngdec.c Project: lubing521/gst-embedded-builder

static gboolean
gst_pngdec_start (GstVideoDecoder * decoder)
{
  GstPngDec *pngdec = (GstPngDec *) decoder;

  gst_pngdec_libpng_init (pngdec);

  return TRUE;
}

Example #6

File: gstpngdec.c Project: DylanZA/gst-plugins-good

static gboolean
gst_pngdec_start (GstVideoDecoder * decoder)
{
  GstPngDec *pngdec = (GstPngDec *) decoder;

  gst_video_decoder_set_packetized (GST_VIDEO_DECODER (pngdec), FALSE);
  gst_pngdec_libpng_init (pngdec);

  return TRUE;
}

Example #7

File: gstpngdec.c Project: JJCG/gst-plugins-good

static GstFlowReturn
gst_pngdec_chain (GstPad * pad, GstBuffer * buffer)
{
  GstPngDec *pngdec;
  GstFlowReturn ret = GST_FLOW_OK;

  pngdec = GST_PNGDEC (gst_pad_get_parent (pad));

  GST_LOG_OBJECT (pngdec, "Got buffer, size=%u", GST_BUFFER_SIZE (buffer));

  if (G_UNLIKELY (!pngdec->setup))
    goto not_configured;

  /* Something is going wrong in our callbacks */
  ret = pngdec->ret;
  if (G_UNLIKELY (ret != GST_FLOW_OK)) {
    GST_WARNING_OBJECT (pngdec, "we have a pending return code of %d", ret);
    goto beach;
  }

  /* Let libpng come back here on error */
  if (setjmp (png_jmpbuf (pngdec->png))) {
    GST_WARNING_OBJECT (pngdec, "error during decoding");
    ret = GST_FLOW_ERROR;
    goto beach;
  }

  pngdec->in_timestamp = GST_BUFFER_TIMESTAMP (buffer);
  pngdec->in_duration = GST_BUFFER_DURATION (buffer);

  /* Progressive loading of the PNG image */
  png_process_data (pngdec->png, pngdec->info, GST_BUFFER_DATA (buffer),
      GST_BUFFER_SIZE (buffer));

  if (pngdec->image_ready) {
    if (pngdec->framed) {
      /* Reset ourselves for the next frame */
      gst_pngdec_libpng_clear (pngdec);
      gst_pngdec_libpng_init (pngdec);
      GST_LOG_OBJECT (pngdec, "setting up callbacks for next frame");
      png_set_progressive_read_fn (pngdec->png, pngdec,
          user_info_callback, user_endrow_callback, user_end_callback);
    } else {
      GST_LOG_OBJECT (pngdec, "sending EOS");
      pngdec->ret = gst_pad_push_event (pngdec->srcpad, gst_event_new_eos ());
    }
    pngdec->image_ready = FALSE;
  }

  /* grab new return code */
  ret = pngdec->ret;

  /* And release the buffer */
  gst_buffer_unref (buffer);

beach:
  gst_object_unref (pngdec);

  return ret;

  /* ERRORS */
not_configured:
  {
    GST_LOG_OBJECT (pngdec, "we are not configured yet");
    ret = GST_FLOW_WRONG_STATE;
    goto beach;
  }
}