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;
}
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;
}
/* 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;
}
/* 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;
}
static gboolean
gst_pngdec_start (GstVideoDecoder * decoder)
{
GstPngDec *pngdec = (GstPngDec *) decoder;
gst_pngdec_libpng_init (pngdec);
return TRUE;
}
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;
}
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;
}
}