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ccconverter: implement discont handling

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
This commit is contained in:
Matthew Waters 2020-05-11 17:14:09 +10:00 committed by GStreamer Merge Bot
parent ba1558a7ab
commit 12edc0d9b8
1 changed files with 59 additions and 28 deletions
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87
ext/closedcaption/gstccconverter.c
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@ -2127,13 +2127,12 @@ gst_cc_converter_transform (GstCCConverter * self, GstBuffer * inbuf,
if (self->current_output_timecode.config.fps_n > 0) {
gst_buffer_add_video_time_code_meta (outbuf,
&self->current_output_timecode);
/* XXX: discont handling? */
gst_video_time_code_increment_frame (&self->current_output_timecode);
}
return GST_FLOW_OK;
} else {
return GST_BASE_TRANSFORM_FLOW_DROPPED;
return GST_FLOW_OK;
}
}
@ -2181,6 +2180,50 @@ can_generate_output (GstCCConverter * self)
return FALSE;
}
static void
reset_counters (GstCCConverter * self)
{
self->scratch_ccp_len = 0;
self->scratch_cea608_1_len = 0;
self->scratch_cea608_2_len = 0;
self->input_frames = 0;
self->output_frames = 1;
gst_video_time_code_clear (&self->current_output_timecode);
gst_clear_buffer (&self->previous_buffer);
}
static GstFlowReturn
drain_input (GstCCConverter * self)
{
GstBaseTransform *trans = GST_BASE_TRANSFORM (self);
GstFlowReturn ret = GST_FLOW_OK;
while (self->scratch_ccp_len > 0 || self->scratch_cea608_1_len > 0
|| self->scratch_cea608_2_len > 0 || can_generate_output (self)) {
GstBuffer *outbuf;
outbuf = gst_buffer_new_allocate (NULL, MAX_CDP_PACKET_LEN, NULL);
ret = gst_cc_converter_transform (self, NULL, outbuf);
if (gst_buffer_get_size (outbuf) <= 0) {
/* try to move the output along */
self->input_frames++;
gst_buffer_unref (outbuf);
continue;
} else if (ret != GST_FLOW_OK) {
gst_buffer_unref (outbuf);
return ret;
}
ret = gst_pad_push (GST_BASE_TRANSFORM_SRC_PAD (trans), outbuf);
if (ret != GST_FLOW_OK) {
return ret;
}
}
return ret;
}
static GstFlowReturn
gst_cc_converter_generate_output (GstBaseTransform * base, GstBuffer ** outbuf)
{
@ -2199,6 +2242,13 @@ gst_cc_converter_generate_output (GstBaseTransform * base, GstBuffer ** outbuf)
*outbuf = inbuf;
ret = GST_FLOW_OK;
} else {
if (inbuf && GST_BUFFER_IS_DISCONT (inbuf)) {
ret = drain_input (self);
reset_counters (self);
if (ret != GST_FLOW_OK)
return ret;
}
*outbuf = gst_buffer_new_allocate (NULL, MAX_CDP_PACKET_LEN, NULL);
if (*outbuf == NULL)
goto no_buffer;
@ -2215,6 +2265,11 @@ gst_cc_converter_generate_output (GstBaseTransform * base, GstBuffer ** outbuf)
}
ret = gst_cc_converter_transform (self, inbuf, *outbuf);
if (gst_buffer_get_size (*outbuf) <= 0) {
gst_buffer_unref (*outbuf);
*outbuf = NULL;
ret = GST_FLOW_OK;
}
if (inbuf)
gst_buffer_unref (inbuf);
@ -2241,35 +2296,11 @@ gst_cc_converter_sink_event (GstBaseTransform * trans, GstEvent * event)
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (self, "received EOS");
while (self->scratch_ccp_len > 0 || self->scratch_cea608_1_len > 0
|| self->scratch_cea608_2_len > 0 || can_generate_output (self)) {
GstBuffer *outbuf;
GstFlowReturn ret;
drain_input (self);
outbuf = gst_buffer_new_allocate (NULL, MAX_CDP_PACKET_LEN, NULL);
ret = gst_cc_converter_transform (self, NULL, outbuf);
if (ret == GST_BASE_TRANSFORM_FLOW_DROPPED) {
/* try to move the output along */
self->input_frames++;
gst_buffer_unref (outbuf);
continue;
} else if (ret != GST_FLOW_OK)
break;
ret = gst_pad_push (GST_BASE_TRANSFORM_SRC_PAD (trans), outbuf);
if (ret != GST_FLOW_OK)
break;
}
/* fallthrough */
case GST_EVENT_FLUSH_START:
self->scratch_ccp_len = 0;
self->scratch_cea608_1_len = 0;
self->scratch_cea608_2_len = 0;
self->input_frames = 0;
self->output_frames = 1;
gst_video_time_code_clear (&self->current_output_timecode);
gst_clear_buffer (&self->previous_buffer);
reset_counters (self);
break;
default:
break;