gstreamer/subprojects/gst-plugins-bad/ext/closedcaption/gstcea608mux.c

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/*
* GStreamer
* Copyright (C) 2023 Mathieu Duponchelle <mathieu@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-cea608mux
* @title: cea608mux
* @short_description: Combine CC1 and CC3 raw 608 streams
*
* ```
* gst-launch-1.0 cea608mux name=mux ! fakesink dump=true \
* filesrc location=one.scc ! sccparse ! closedcaption/x-cea-608 ! ccconverter ! mux. \
* filesrc location=two.scc ! sccparse ! ccconverter ! closedcaption/x-cea-608, format=raw, field=0 ! \
* capssetter caps="closedcaption/x-cea-608, format=raw, field=1" ! mux.
* ```
*
* Since: 1.24
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <gst/base/base.h>
#include <gst/video/video.h>
#include <string.h>
#include "ccutils.h"
#include "gstcea608mux.h"
GST_DEBUG_CATEGORY_STATIC (gst_cea608_mux_debug);
#define GST_CAT_DEFAULT gst_cea608_mux_debug
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("closedcaption/x-cea-608, format=s334-1a, "
"framerate=(fraction){60/1, 60000/1001, 50/1, 30/1, 30000/1001, 25/1, 24/1, 24000/1001}"));
static GstStaticPadTemplate cc1_template = GST_STATIC_PAD_TEMPLATE ("cc1",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("closedcaption/x-cea-608,format=raw,field=0"));
static GstStaticPadTemplate cc3_template = GST_STATIC_PAD_TEMPLATE ("cc3",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("closedcaption/x-cea-608,format=raw,field=1"));
#define parent_class gst_cea608_mux_parent_class
G_DEFINE_TYPE (GstCea608Mux, gst_cea608_mux, GST_TYPE_AGGREGATOR);
GST_ELEMENT_REGISTER_DEFINE (cea608mux, "cea608mux",
GST_RANK_NONE, GST_TYPE_CEA608MUX);
enum
{
PROP_0,
};
static void
gst_cea608_mux_finalize (GObject * object)
{
GstCea608Mux *self = GST_CEA608MUX (object);
gst_clear_object (&self->cc_buffer);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
#define GST_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
static GstAggregatorPad *
find_best_pad (GstAggregator * aggregator, GstClockTime * ts, gboolean timeout)
{
GstAggregatorPad *best = NULL;
GstClockTime best_ts = GST_CLOCK_TIME_NONE;
GstIterator *pads;
GValue padptr = { 0, };
gboolean done = FALSE;
pads = gst_element_iterate_sink_pads (GST_ELEMENT (aggregator));
while (!done) {
switch (gst_iterator_next (pads, &padptr)) {
case GST_ITERATOR_OK:{
GstAggregatorPad *apad = g_value_get_object (&padptr);
GstClockTime t = GST_CLOCK_TIME_NONE;
GstBuffer *buffer;
buffer = gst_aggregator_pad_peek_buffer (apad);
if (!buffer) {
if (!timeout && !GST_PAD_IS_EOS (apad)) {
gst_object_replace ((GstObject **) & best, NULL);
best_ts = GST_CLOCK_TIME_NONE;
done = TRUE;
}
break;
}
if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS_OR_PTS (buffer))) {
t = gst_segment_to_running_time (&apad->segment, GST_FORMAT_TIME,
GST_BUFFER_PTS (buffer));
}
if (!GST_CLOCK_TIME_IS_VALID (best_ts) ||
(GST_CLOCK_TIME_IS_VALID (t) && t < best_ts)) {
gst_object_replace ((GstObject **) & best, GST_OBJECT (apad));
best_ts = t;
}
gst_buffer_unref (buffer);
break;
}
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (pads);
/* Clear the best pad and start again. It might have disappeared */
gst_object_replace ((GstObject **) & best, NULL);
best_ts = GST_CLOCK_TIME_NONE;
break;
case GST_ITERATOR_ERROR:
/* This can't happen if the parameters to gst_iterator_next() are valid */
g_assert_not_reached ();
break;
}
g_value_reset (&padptr);
}
g_value_unset (&padptr);
gst_iterator_free (pads);
if (best) {
GST_LOG_OBJECT (aggregator,
"Best pad found with TS %" GST_TIME_FORMAT ": %" GST_PTR_FORMAT,
GST_TIME_ARGS (best_ts), best);
} else {
GST_LOG_OBJECT (aggregator, "Best pad not found");
}
if (ts && GST_CLOCK_TIME_IS_VALID (best_ts))
*ts = best_ts;
return best;
}
static gboolean
all_pads_eos (GstAggregator * agg)
{
GList *l;
gboolean ret = TRUE;
GST_OBJECT_LOCK (agg);
for (l = GST_ELEMENT_CAST (agg)->sinkpads; l; l = l->next) {
GstAggregatorPad *pad = GST_AGGREGATOR_PAD (l->data);
if (!gst_aggregator_pad_is_eos (pad)) {
ret = FALSE;
break;
}
}
GST_OBJECT_UNLOCK (agg);
return ret;
}
static void
take_s334_both_fields (GstCea608Mux * self, GstBuffer * buffer)
{
GstMapInfo out = GST_MAP_INFO_INIT;
guint s334_len, cc_data_len, i;
gst_buffer_map (buffer, &out, GST_MAP_READWRITE);
cc_data_len = out.size;
cc_buffer_take_cc_data (self->cc_buffer, self->cdp_fps_entry, FALSE, out.data,
&cc_data_len);
s334_len = drop_ccp_from_cc_data (out.data, cc_data_len);
if (s334_len < 0) {
s334_len = 0;
goto out;
}
for (i = 0; i < s334_len / 3; i++) {
guint byte = out.data[i * 3];
/* We have to assume a line offset of 0 */
out.data[i * 3] = (byte == 0xfc || byte == 0xf8) ? 0x80 : 0x00;
}
out:
gst_buffer_unmap (buffer, &out);
gst_buffer_set_size (buffer, s334_len);
}
static GstFlowReturn
finish_s334_both_fields (GstCea608Mux * self)
{
GstClockTime output_pts = gst_util_uint64_scale_int (GST_SECOND,
self->cdp_fps_entry->fps_d * self->n_output_buffers,
self->cdp_fps_entry->fps_n);
GstClockTime output_duration =
gst_util_uint64_scale_int (GST_SECOND, self->cdp_fps_entry->fps_d,
self->cdp_fps_entry->fps_n);
GstBuffer *output = gst_buffer_new_allocate (NULL, MAX_CDP_PACKET_LEN, NULL);
GstSegment *agg_segment =
&GST_AGGREGATOR_PAD (GST_AGGREGATOR (self)->srcpad)->segment;
output_pts += self->start_time;
take_s334_both_fields (self, output);
GST_BUFFER_PTS (output) = output_pts;
GST_BUFFER_DURATION (output) = output_duration;
GST_DEBUG_OBJECT (self, "Finishing %" GST_PTR_FORMAT, output);
self->n_output_buffers += 1;
agg_segment->position = output_pts + output_duration;
return gst_aggregator_finish_buffer (GST_AGGREGATOR (self), output);
}
static GstFlowReturn
gst_cea608_mux_aggregate (GstAggregator * aggregator, gboolean timeout)
{
GstCea608Mux *self = GST_CEA608MUX (aggregator);
GstFlowReturn flow_ret = GST_FLOW_OK;
GstAggregatorPad *best_pad = NULL;
GstClockTime output_duration =
gst_util_uint64_scale_int (GST_SECOND, self->cdp_fps_entry->fps_d,
self->cdp_fps_entry->fps_n);
GstSegment *agg_segment = &GST_AGGREGATOR_PAD (aggregator->srcpad)->segment;
GstClockTime output_start_time = agg_segment->position;
GstClockTime output_end_running_time;
if (agg_segment->position == -1 || agg_segment->position < agg_segment->start)
output_start_time = agg_segment->start;
if (!GST_CLOCK_TIME_IS_VALID (self->start_time)) {
self->start_time = output_start_time;
GST_DEBUG_OBJECT (self, "Start time %" GST_TIME_FORMAT,
GST_TIME_ARGS (self->start_time));
}
best_pad =
find_best_pad (aggregator, &self->earliest_input_running_time, timeout);
output_end_running_time =
gst_segment_to_running_time (agg_segment, GST_FORMAT_TIME,
output_start_time + output_duration);
GST_LOG_OBJECT (self, "best-pad: %s, timeout: %d, "
"earliest input running time: %"
GST_TIME_FORMAT ", output running time: %" GST_TIME_FORMAT,
best_pad ? GST_OBJECT_NAME (best_pad) : "NULL", timeout,
GST_TIME_ARGS (self->earliest_input_running_time),
GST_TIME_ARGS (output_end_running_time));
if (GST_CLOCK_TIME_IS_VALID (self->earliest_input_running_time)
&& self->earliest_input_running_time > output_end_running_time) {
/* Nothing to consume, earliest pad is not ready yet */
GST_LOG_OBJECT (self, "Nothing to consume");
} else if (best_pad) {
GstBuffer *buffer;
buffer = gst_aggregator_pad_pop_buffer (GST_AGGREGATOR_PAD (best_pad));
if (buffer) {
GstMapInfo map;
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (g_strcmp0 (GST_PAD_NAME (best_pad), "cc1") == 0) {
GST_DEBUG_OBJECT (self, "Consuming CC1 %" GST_PTR_FORMAT, buffer);
cc_buffer_push_separated (self->cc_buffer, map.data, map.size, NULL, 0,
NULL, 0);
} else {
GST_DEBUG_OBJECT (self, "Consuming CC3 %" GST_PTR_FORMAT, buffer);
cc_buffer_push_separated (self->cc_buffer, NULL, 0, map.data, map.size,
NULL, 0);
}
gst_buffer_unmap (buffer, &map);
} else {
/* We got flushed */
flow_ret = GST_AGGREGATOR_FLOW_NEED_DATA;
}
} else if (all_pads_eos (aggregator)) {
GST_INFO_OBJECT (self, "EOS!");
flow_ret = GST_FLOW_EOS;
} else {
GST_LOG_OBJECT (self, "Need more data");
flow_ret = GST_AGGREGATOR_FLOW_NEED_DATA;
}
if (flow_ret == GST_FLOW_OK) {
if (timeout || output_end_running_time < self->earliest_input_running_time) {
flow_ret = finish_s334_both_fields (self);
}
} else if (flow_ret == GST_FLOW_EOS && !cc_buffer_is_empty (self->cc_buffer)) {
flow_ret = finish_s334_both_fields (self);
}
g_clear_pointer (&best_pad, gst_object_unref);
return flow_ret;
}
static gboolean
gst_cea608_mux_stop (GstAggregator * aggregator)
{
GstCea608Mux *self = GST_CEA608MUX (aggregator);
cc_buffer_discard (self->cc_buffer);
self->n_output_buffers = 0;
self->earliest_input_running_time = 0;
self->start_time = GST_CLOCK_TIME_NONE;
return TRUE;
}
static GstFlowReturn
gst_cea608_mux_flush (GstAggregator * aggregator)
{
GstCea608Mux *self = GST_CEA608MUX (aggregator);
GstSegment *agg_segment = &GST_AGGREGATOR_PAD (aggregator->srcpad)->segment;
GST_DEBUG_OBJECT (self, "Flush");
cc_buffer_discard (self->cc_buffer);
self->n_output_buffers = 0;
self->earliest_input_running_time = 0;
self->start_time = GST_CLOCK_TIME_NONE;
agg_segment->position = -1;
return GST_FLOW_OK;
}
static gboolean
gst_cea608_mux_negotiated_src_caps (GstAggregator * agg, GstCaps * caps)
{
GstStructure *s = gst_caps_get_structure (caps, 0);
gint fps_n, fps_d;
GstCea608Mux *self = GST_CEA608MUX (agg);
GstClockTime latency;
GST_INFO_OBJECT (agg->srcpad, "set src caps: %" GST_PTR_FORMAT, caps);
g_assert (gst_structure_get_fraction (s, "framerate", &fps_n,
&fps_d) == TRUE);
self->cdp_fps_entry = cdp_fps_entry_from_fps (fps_n, fps_d);
g_assert (self->cdp_fps_entry != NULL && self->cdp_fps_entry->fps_n != 0);
latency =
gst_util_uint64_scale (GST_SECOND, self->cdp_fps_entry->fps_d,
self->cdp_fps_entry->fps_n);
gst_aggregator_set_latency (agg, latency, latency);
return TRUE;
}
static GstBuffer *
gst_cea608_mux_clip (GstAggregator * aggregator, GstAggregatorPad * pad,
GstBuffer * buffer)
{
GstClockTime time;
if (!GST_BUFFER_PTS_IS_VALID (buffer))
return buffer;
time = gst_segment_to_running_time (&pad->segment, GST_FORMAT_TIME,
GST_BUFFER_PTS (buffer));
if (!GST_CLOCK_TIME_IS_VALID (time)) {
GST_DEBUG_OBJECT (pad, "Dropping buffer on pad outside segment %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
gst_buffer_unref (buffer);
return NULL;
}
return buffer;
}
static void
gst_cea608_mux_class_init (GstCea608MuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstAggregatorClass *aggregator_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
aggregator_class = (GstAggregatorClass *) klass;
gobject_class->finalize = gst_cea608_mux_finalize;
gst_element_class_set_static_metadata (gstelement_class,
"Closed Caption Muxer",
"Aggregator",
"Combines raw 608 streams",
"Mathieu Duponchelle <mathieu@centricular.com>");
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&srctemplate, GST_TYPE_AGGREGATOR_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&cc1_template, GST_TYPE_AGGREGATOR_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&cc3_template, GST_TYPE_AGGREGATOR_PAD);
aggregator_class->aggregate = gst_cea608_mux_aggregate;
aggregator_class->stop = gst_cea608_mux_stop;
aggregator_class->flush = gst_cea608_mux_flush;
aggregator_class->negotiated_src_caps = gst_cea608_mux_negotiated_src_caps;
aggregator_class->get_next_time = gst_aggregator_simple_get_next_time;
aggregator_class->clip = gst_cea608_mux_clip;
GST_DEBUG_CATEGORY_INIT (gst_cea608_mux_debug, "cea608mux",
0, "Closed Caption muxer");
}
static void
gst_cea608_mux_init (GstCea608Mux * self)
{
self->cc_buffer = cc_buffer_new ();
cc_buffer_set_max_buffer_time (self->cc_buffer, GST_CLOCK_TIME_NONE);
cc_buffer_set_output_padding (self->cc_buffer, TRUE);
self->cdp_fps_entry = &null_fps_entry;
self->start_time = GST_CLOCK_TIME_NONE;
}