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gstreamer/subprojects/gst-plugins-bad/ext/closedcaption/gstccconverter.c
Seungha Yang d2d2ac43e8 ccconverter: Send gap event if generated output is empty 
Sends a gap event if nothing to output for a given input buffer.
For example, an input buffer might not contain any caption data
for downstream requested field, then we need to inform downstream
of the case.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6073>
2024-02-09 11:03:21 +00:00

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/*
* GStreamer
* Copyright (C) 2018 Sebastian Dröge <sebastian@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.
*/
#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 "gstccconverter.h"
GST_DEBUG_CATEGORY_STATIC (gst_cc_converter_debug);
#define GST_CAT_DEFAULT gst_cc_converter_debug
/**
* GstCCConverterCDPMode:
* @GST_CC_CONVERTER_CDP_MODE_TIME_CODE: Store time code information in CDP packets
* @GST_CC_CONVERTER_CDP_MODE_CC_DATA: Store CC data in CDP packets
* @GST_CC_CONVERTER_CDP_MODE_CC_SVC_INFO: Store CC service information in CDP packets
*
* Since: 1.20
*/
enum
{
PROP_0,
PROP_CDP_MODE,
};
#define DEFAULT_CDP_MODE (GST_CC_CONVERTER_CDP_MODE_TIME_CODE | GST_CC_CONVERTER_CDP_MODE_CC_DATA | GST_CC_CONVERTER_CDP_MODE_CC_SVC_INFO)
#define DEFAULT_FIELD 0
/* Ordered by the amount of information they can contain */
#define CC_CAPS \
"closedcaption/x-cea-708,format=(string) cdp; " \
"closedcaption/x-cea-708,format=(string) cc_data; " \
"closedcaption/x-cea-608,format=(string) s334-1a; " \
"closedcaption/x-cea-608,format=(string) raw, field=(int) {0, 1}"
#define VAL_OR_0(v) ((v) ? (*(v)) : 0)
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CC_CAPS));
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CC_CAPS));
#define parent_class gst_cc_converter_parent_class
G_DEFINE_TYPE (GstCCConverter, gst_cc_converter, GST_TYPE_BASE_TRANSFORM);
GST_ELEMENT_REGISTER_DEFINE (ccconverter, "ccconverter",
GST_RANK_NONE, GST_TYPE_CCCONVERTER);
#define GST_TYPE_CC_CONVERTER_CDP_MODE (gst_cc_converter_cdp_mode_get_type())
static GType
gst_cc_converter_cdp_mode_get_type (void)
{
static const GFlagsValue values[] = {
{GST_CC_CDP_MODE_TIME_CODE,
"Store time code information in CDP packets", "time-code"},
{GST_CC_CDP_MODE_CC_DATA, "Store CC data in CDP packets",
"cc-data"},
{GST_CC_CDP_MODE_CC_SVC_INFO,
"Store CC service information in CDP packets", "cc-svc-info"},
{0, NULL, NULL}
};
static GType id = 0;
if (g_once_init_enter ((gsize *) & id)) {
GType _id;
_id = g_flags_register_static ("GstCCConverterCDPMode", values);
g_once_init_leave ((gsize *) & id, _id);
}
return id;
}
static gboolean
gst_cc_converter_transform_size (GstBaseTransform * base,
GstPadDirection direction,
GstCaps * caps, gsize size, GstCaps * othercaps, gsize * othersize)
{
/* We can't really convert from an output size to an input size */
if (direction != GST_PAD_SINK)
return FALSE;
/* Assume worst-case here and over-allocate, and in ::transform() we then
* downsize the buffer as needed. The worst-case is one CDP packet, which
* can be up to MAX_CDP_PACKET_LEN bytes large */
*othersize = MAX_CDP_PACKET_LEN;
return TRUE;
}
static GstCaps *
gst_cc_converter_transform_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
static GstStaticCaps non_cdp_caps =
GST_STATIC_CAPS ("closedcaption/x-cea-708, format=(string)cc_data; "
"closedcaption/x-cea-608,format=(string) s334-1a; "
"closedcaption/x-cea-608,format=(string) raw, field=(int) {0, 1}");
static GstStaticCaps cdp_caps =
GST_STATIC_CAPS ("closedcaption/x-cea-708, format=(string)cdp");
static GstStaticCaps cdp_caps_framerate =
GST_STATIC_CAPS ("closedcaption/x-cea-708, format=(string)cdp, "
"framerate=(fraction){60/1, 60000/1001, 50/1, 30/1, 30000/1001, 25/1, 24/1, 24000/1001}");
static GstStaticCaps raw_608_caps =
GST_STATIC_CAPS ("closedcaption/x-cea-608,format=(string) raw");
GstCCConverter *self = GST_CCCONVERTER (base);
guint i, n;
GstCaps *res, *templ;
templ = gst_pad_get_pad_template_caps (base->srcpad);
GST_DEBUG_OBJECT (self, "direction %s from caps %" GST_PTR_FORMAT,
direction == GST_PAD_SRC ? "src" : "sink", caps);
res = gst_caps_new_empty ();
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
const GstStructure *s = gst_caps_get_structure (caps, i);
const GValue *framerate = gst_structure_get_value (s, "framerate");
if (gst_structure_has_name (s, "closedcaption/x-cea-608")) {
const GValue *field = gst_structure_get_value (s, "field");
if (direction == GST_PAD_SRC) {
GstCaps *tmp;
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
if (!field) {
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
}
/* SRC direction: We produce upstream caps
*
* Downstream wanted CEA608 caps. If it had a framerate, we
* also need upstream to provide exactly that same framerate
* and otherwise we don't care.
*
* We can convert everything to CEA608.
*/
res = gst_caps_merge (res, gst_static_caps_get (&cdp_caps_framerate));
if (framerate) {
/* we can only keep the same framerate for non-cdp */
gst_caps_set_value (tmp, "framerate", framerate);
}
res = gst_caps_merge (res, tmp);
} else {
/* SINK: We produce downstream caps
*
* Upstream provided CEA608 caps. We can convert that to CDP if
* also a CDP compatible framerate was provided, and we can convert
* it to anything else regardless.
*
* If upstream provided a framerate we can pass that through, possibly
* filtered for the CDP case.
*/
if (framerate) {
GstCaps *tmp;
GstStructure *t;
/* Create caps that contain the intersection of all framerates with
* the CDP allowed framerates */
tmp =
gst_caps_make_writable (gst_static_caps_get
(&cdp_caps_framerate));
t = gst_caps_get_structure (tmp, 0);
gst_structure_set_name (t, "closedcaption/x-cea-608");
gst_structure_remove_field (t, "format");
if (gst_structure_can_intersect (s, t)) {
gst_caps_unref (tmp);
tmp =
gst_caps_make_writable (gst_static_caps_get
(&cdp_caps_framerate));
res = gst_caps_merge (res, tmp);
} else {
gst_caps_unref (tmp);
}
/* And we can convert to everything else with the given framerate */
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
if (!field) {
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
}
gst_caps_set_value (tmp, "framerate", framerate);
res = gst_caps_merge (res, tmp);
} else {
res = gst_caps_merge (res, gst_static_caps_get (&non_cdp_caps));
if (!field) {
res = gst_caps_merge (res, gst_static_caps_get (&raw_608_caps));
}
}
}
} else if (gst_structure_has_name (s, "closedcaption/x-cea-708")) {
if (direction == GST_PAD_SRC) {
/* SRC direction: We produce upstream caps
*
* Downstream wanted CEA708 caps. If downstream wants *only* CDP we
* either need CDP from upstream, or anything else with a CDP
* framerate.
* If downstream also wants non-CDP we can accept anything.
*
* We pass through any framerate as-is, except for filtering
* for CDP framerates if downstream wants only CDP.
*/
if (g_strcmp0 (gst_structure_get_string (s, "format"), "cdp") == 0) {
/* Downstream wants only CDP */
/* We need CDP from upstream in that case */
res = gst_caps_merge (res, gst_static_caps_get (&cdp_caps_framerate));
/* Or anything else with a CDP framerate */
if (framerate) {
GstCaps *tmp;
GstStructure *t;
const GValue *cdp_framerate;
/* Create caps that contain the intersection of all framerates with
* the CDP allowed framerates */
tmp =
gst_caps_make_writable (gst_static_caps_get
(&cdp_caps_framerate));
t = gst_caps_get_structure (tmp, 0);
/* There's an intersection between the framerates so we can convert
* into CDP with exactly those framerates from anything else */
cdp_framerate = gst_structure_get_value (t, "framerate");
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
gst_caps_set_value (tmp, "framerate", cdp_framerate);
res = gst_caps_merge (res, tmp);
} else {
GstCaps *tmp, *cdp_caps;
const GValue *cdp_framerate;
/* Get all CDP framerates, we can accept anything that has those
* framerates */
cdp_caps = gst_static_caps_get (&cdp_caps_framerate);
cdp_framerate =
gst_structure_get_value (gst_caps_get_structure (cdp_caps, 0),
"framerate");
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
gst_caps_set_value (tmp, "framerate", cdp_framerate);
gst_caps_unref (cdp_caps);
res = gst_caps_merge (res, tmp);
}
} else {
/* Downstream wants not only CDP, we can do everything */
res = gst_caps_merge (res, gst_static_caps_get (&cdp_caps_framerate));
if (framerate) {
/* we can only keep the same framerate for non-cdp */
GstCaps *tmp;
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
gst_caps_set_value (tmp, "framerate", framerate);
res = gst_caps_merge (res, tmp);
} else {
res = gst_caps_merge (res, gst_static_caps_get (&non_cdp_caps));
res = gst_caps_merge (res, gst_static_caps_get (&raw_608_caps));
}
}
} else {
GstCaps *tmp;
/* SINK: We produce downstream caps
*
* Upstream provided CEA708 caps. If upstream provided CDP we can
* output CDP, no matter what (-> passthrough). If upstream did not
* provide CDP, we can output CDP only if the framerate fits.
* We can always produce everything else apart from CDP.
*
* If upstream provided a framerate we pass that through for non-CDP
* output, and pass it through filtered for CDP output.
*/
if (gst_structure_can_intersect (s,
gst_caps_get_structure (gst_static_caps_get (&cdp_caps), 0))) {
/* Upstream provided CDP caps, we can do everything independent of
* framerate */
res = gst_caps_merge (res, gst_static_caps_get (&cdp_caps_framerate));
} else if (framerate) {
const GValue *cdp_framerate;
GstStructure *t;
/* Upstream did not provide CDP. We can only do CDP if upstream
* happened to have a CDP framerate */
/* Create caps that contain the intersection of all framerates with
* the CDP allowed framerates */
tmp =
gst_caps_make_writable (gst_static_caps_get
(&cdp_caps_framerate));
t = gst_caps_get_structure (tmp, 0);
/* There's an intersection between the framerates so we can convert
* into CDP with exactly those framerates */
cdp_framerate = gst_structure_get_value (t, "framerate");
if (gst_value_intersect (NULL, cdp_framerate, framerate)) {
gst_caps_set_value (tmp, "framerate", cdp_framerate);
res = gst_caps_merge (res, tmp);
} else {
gst_clear_caps (&tmp);
}
}
/* We can always convert CEA708 to all non-CDP formats */
if (framerate) {
/* we can only keep the same framerate for non-cdp */
GstCaps *tmp;
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_caps));
tmp = gst_caps_merge (tmp, gst_static_caps_get (&raw_608_caps));
gst_caps_set_value (tmp, "framerate", framerate);
res = gst_caps_merge (res, tmp);
} else {
res = gst_caps_merge (res, gst_static_caps_get (&non_cdp_caps));
res = gst_caps_merge (res, gst_static_caps_get (&raw_608_caps));
}
}
} else {
g_assert_not_reached ();
}
}
GST_DEBUG_OBJECT (self, "pre filter caps %" GST_PTR_FORMAT, res);
/* We can convert anything into anything but it might involve loss of
* information so always filter according to the order in our template caps
* in the end */
if (filter) {
GstCaps *tmp;
filter = gst_caps_intersect_full (templ, filter, GST_CAPS_INTERSECT_FIRST);
tmp = gst_caps_intersect_full (filter, res, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (res);
res = tmp;
}
gst_caps_unref (templ);
GST_DEBUG_OBJECT (self, "Transformed in direction %s caps %" GST_PTR_FORMAT,
direction == GST_PAD_SRC ? "src" : "sink", caps);
GST_DEBUG_OBJECT (self, "filter %" GST_PTR_FORMAT, filter);
GST_DEBUG_OBJECT (self, "to %" GST_PTR_FORMAT, res);
gst_clear_caps (&filter);
return res;
}
static GstCaps *
gst_cc_converter_fixate_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * incaps, GstCaps * outcaps)
{
GstCCConverter *self = GST_CCCONVERTER (base);
const GstStructure *s;
GstStructure *t;
const GValue *framerate;
GstCaps *intersection, *templ;
GST_DEBUG_OBJECT (self, "Fixating in direction %s incaps %" GST_PTR_FORMAT,
direction == GST_PAD_SRC ? "src" : "sink", incaps);
GST_DEBUG_OBJECT (self, "and outcaps %" GST_PTR_FORMAT, outcaps);
/* Prefer passthrough if we can */
if (gst_caps_is_subset (incaps, outcaps)) {
gst_caps_unref (outcaps);
return GST_BASE_TRANSFORM_CLASS (parent_class)->fixate_caps (base,
direction, incaps, gst_caps_ref (incaps));
}
/* Otherwise prefer caps in the order of our template caps */
templ = gst_pad_get_pad_template_caps (base->srcpad);
intersection =
gst_caps_intersect_full (templ, outcaps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (outcaps);
outcaps = intersection;
outcaps =
GST_BASE_TRANSFORM_CLASS (parent_class)->fixate_caps (base, direction,
incaps, outcaps);
s = gst_caps_get_structure (incaps, 0);
framerate = gst_structure_get_value (s, "framerate");
outcaps = gst_caps_make_writable (outcaps);
t = gst_caps_get_structure (outcaps, 0);
if (!framerate) {
/* remove any output framerate that might've been added by basetransform
* due to intersecting with downstream */
gst_structure_remove_field (t, "framerate");
} else {
/* or passthrough the input framerate if possible */
guint n, d;
n = gst_value_get_fraction_numerator (framerate);
d = gst_value_get_fraction_denominator (framerate);
if (gst_structure_has_field (t, "framerate"))
gst_structure_fixate_field_nearest_fraction (t, "framerate", n, d);
else
gst_structure_set (t, "framerate", GST_TYPE_FRACTION, n, d, NULL);
}
GST_DEBUG_OBJECT (self,
"Fixated caps %" GST_PTR_FORMAT " to %" GST_PTR_FORMAT, incaps, outcaps);
return outcaps;
}
static gboolean
gst_cc_converter_set_caps (GstBaseTransform * base, GstCaps * incaps,
GstCaps * outcaps)
{
GstCCConverter *self = GST_CCCONVERTER (base);
const GstStructure *s;
gboolean passthrough;
static GstStaticCaps raw_608_caps =
GST_STATIC_CAPS ("closedcaption/x-cea-608,format=(string) raw");
self->input_caption_type = gst_video_caption_type_from_caps (incaps);
self->output_caption_type = gst_video_caption_type_from_caps (outcaps);
if (self->input_caption_type == GST_VIDEO_CAPTION_TYPE_UNKNOWN ||
self->output_caption_type == GST_VIDEO_CAPTION_TYPE_UNKNOWN)
goto invalid_caps;
s = gst_caps_get_structure (incaps, 0);
if (!gst_structure_get_fraction (s, "framerate", &self->in_fps_n,
&self->in_fps_d))
self->in_fps_n = self->in_fps_d = 0;
if (!gst_structure_get_int (s, "field", &self->in_field))
self->in_field = 0;
s = gst_caps_get_structure (outcaps, 0);
if (!gst_structure_get_fraction (s, "framerate", &self->out_fps_n,
&self->out_fps_d))
self->out_fps_n = self->out_fps_d = 0;
if (!gst_structure_get_int (s, "field", &self->out_field))
self->out_field = 0;
gst_video_time_code_clear (&self->current_output_timecode);
if (gst_caps_is_subset (incaps, gst_static_caps_get (&raw_608_caps)) &&
gst_caps_is_subset (outcaps, gst_static_caps_get (&raw_608_caps))) {
passthrough = self->in_field == self->out_field;
} else {
/* Caps can be different but we can passthrough as long as they can
* intersect, i.e. have same caps name and format */
passthrough = gst_caps_can_intersect (incaps, outcaps);
}
gst_base_transform_set_passthrough (base, passthrough);
GST_DEBUG_OBJECT (self,
"Got caps %" GST_PTR_FORMAT " to %" GST_PTR_FORMAT " (passthrough %d)",
incaps, outcaps, passthrough);
return TRUE;
invalid_caps:
{
GST_ERROR_OBJECT (self,
"Invalid caps: in %" GST_PTR_FORMAT " out: %" GST_PTR_FORMAT, incaps,
outcaps);
return FALSE;
}
}
static void
get_framerate_output_scale (GstCCConverter * self,
const struct cdp_fps_entry *in_fps_entry, gint * scale_n, gint * scale_d)
{
if (self->in_fps_n == 0 || self->out_fps_d == 0) {
*scale_n = 1;
*scale_d = 1;
return;
}
/* compute the relative rates of the two framerates */
if (!gst_util_fraction_multiply (in_fps_entry->fps_d, in_fps_entry->fps_n,
self->out_fps_n, self->out_fps_d, scale_n, scale_d))
/* we should never overflow */
g_assert_not_reached ();
}
static gboolean
interpolate_time_code_with_framerate (GstCCConverter * self,
const GstVideoTimeCode * tc, gint out_fps_n, gint out_fps_d,
gint scale_n, gint scale_d, GstVideoTimeCode * out)
{
gchar *tc_str;
gint output_n, output_d;
guint output_frame;
GstVideoTimeCodeFlags flags;
g_return_val_if_fail (out != NULL, FALSE);
/* out_n/d can only be 0 if scale_n/d are 1/1 */
g_return_val_if_fail ((scale_n == 1 && scale_d == 1) || (out_fps_n != 0
&& out_fps_d != 0), FALSE);
if (!tc || tc->config.fps_n == 0)
return FALSE;
if (!gst_util_fraction_multiply (tc->frames, 1, scale_n, scale_d, &output_n,
&output_d))
/* we should never overflow */
g_assert_not_reached ();
tc_str = gst_video_time_code_to_string (tc);
GST_TRACE_OBJECT (self, "interpolating time code %s with scale %d/%d "
"to frame %d/%d", tc_str, scale_n, scale_d, output_n, output_d);
g_free (tc_str);
if (out_fps_n == 0 || out_fps_d == 0) {
out_fps_n = tc->config.fps_n;
out_fps_d = tc->config.fps_d;
}
flags = tc->config.flags;
if ((flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) != 0 && out_fps_d != 1001
&& out_fps_n != 60000 && out_fps_n != 30000) {
flags &= ~GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME;
} else if ((flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) == 0
&& out_fps_d == 1001 && (out_fps_n == 60000 || out_fps_n == 30000)) {
/* XXX: theoretically, not quite correct however this is an assumption
* we have elsewhere that these framerates are always drop-framed */
flags |= GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME;
}
output_frame = output_n / output_d;
*out = (GstVideoTimeCode) GST_VIDEO_TIME_CODE_INIT;
do {
/* here we try to find the next available valid timecode. The dropped
* (when they exist) frames in time codes are that the beginning of each
* minute */
gst_video_time_code_clear (out);
gst_video_time_code_init (out, out_fps_n, out_fps_d,
tc->config.latest_daily_jam, flags, tc->hours, tc->minutes,
tc->seconds, output_frame, tc->field_count);
output_frame++;
} while ((flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) != 0
&& output_frame < 10 && !gst_video_time_code_is_valid (out));
tc_str = gst_video_time_code_to_string (out);
GST_TRACE_OBJECT (self, "interpolated to %s", tc_str);
g_free (tc_str);
return TRUE;
}
static gboolean
can_take_buffer (GstCCConverter * self,
const struct cdp_fps_entry *in_fps_entry,
const struct cdp_fps_entry *out_fps_entry,
const GstVideoTimeCode * in_tc, GstVideoTimeCode * out_tc)
{
int input_frame_n, input_frame_d, output_frame_n, output_frame_d;
int output_time_cmp, scale_n, scale_d;
/* TODO: handle input discont */
if (self->in_fps_n == 0) {
input_frame_n = self->input_frames;
input_frame_d = 1;
} else {
/* compute the relative frame count for each */
if (!gst_util_fraction_multiply (self->in_fps_d, self->in_fps_n,
self->input_frames, 1, &input_frame_n, &input_frame_d))
/* we should never overflow */
g_assert_not_reached ();
}
if (self->in_fps_n == 0) {
output_frame_n = self->output_frames;
output_frame_d = 1;
} else {
if (!gst_util_fraction_multiply (self->out_fps_d, self->out_fps_n,
self->output_frames, 1, &output_frame_n, &output_frame_d))
/* we should never overflow */
g_assert_not_reached ();
}
output_time_cmp = gst_util_fraction_compare (input_frame_n, input_frame_d,
output_frame_n, output_frame_d);
if (output_time_cmp == 0) {
self->output_frames = 0;
self->input_frames = 0;
}
in_fps_entry = cdp_fps_entry_from_fps (self->in_fps_n, self->in_fps_d);
if (!in_fps_entry || in_fps_entry->fps_n == 0)
g_assert_not_reached ();
/* compute the relative rates of the two framerates */
get_framerate_output_scale (self, in_fps_entry, &scale_n, &scale_d);
GST_TRACE_OBJECT (self, "performing conversion at scale %d/%d, "
"time comparison %i", scale_n, scale_d, output_time_cmp);
if (output_time_cmp < 0) {
/* we can't generate an output yet */
return FALSE;
} else {
interpolate_time_code_with_framerate (self, in_tc, out_fps_entry->fps_n,
out_fps_entry->fps_d, scale_n, scale_d, out_tc);
return TRUE;
}
}
static guint
convert_cea708_cc_data_cea708_cdp_internal (GstCCConverter * self,
const guint8 * cc_data, guint cc_data_len, guint8 * cdp, guint cdp_len,
const GstVideoTimeCode * tc, const struct cdp_fps_entry *fps_entry)
{
guint ret;
ret = convert_cea708_cc_data_to_cdp (GST_OBJECT (self),
(GstCCCDPMode) self->cdp_mode, self->cdp_hdr_sequence_cntr, cc_data,
cc_data_len, cdp, cdp_len, tc, fps_entry);
self->cdp_hdr_sequence_cntr++;
return ret;
}
static gboolean
push_cdp_buffer (GstCCConverter * self, GstBuffer * inbuf,
GstVideoTimeCode * out_tc, const struct cdp_fps_entry **in_fps_entry)
{
guint8 cc_data[MAX_CDP_PACKET_LEN];
guint cc_data_len = 0;
GstMapInfo in;
if (inbuf) {
gst_buffer_map (inbuf, &in, GST_MAP_READ);
cc_data_len =
convert_cea708_cdp_to_cc_data (GST_OBJECT (self), in.data, in.size,
cc_data, out_tc, in_fps_entry);
cc_buffer_push_cc_data (self->cc_buffer, cc_data, cc_data_len);
gst_buffer_unmap (inbuf, &in);
self->input_frames++;
}
return TRUE;
}
static GstFlowReturn
convert_cea608_raw_cea608_s334_1a (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
n = gst_buffer_get_size (inbuf);
if (n & 1) {
GST_WARNING_OBJECT (self, "Invalid raw CEA608 buffer size");
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
n /= 2;
if (n > 3) {
GST_WARNING_OBJECT (self, "Too many CEA608 pairs %u. Truncating to %u", n,
3);
n = 3;
}
gst_buffer_set_size (outbuf, 3 * n);
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
/* We don't know from which line offset it originally is */
for (i = 0; i < n; i++) {
out.data[i * 3] = self->in_field == 0 ? 0x80 : 0x00;
out.data[i * 3 + 1] = in.data[i * 2];
out.data[i * 3 + 2] = in.data[i * 2 + 1];
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
return GST_FLOW_OK;
}
static inline guint8
eia608_parity_strip (guint8 cc_data)
{
return cc_data & 0x7F;
}
static GstFlowReturn
convert_cea608_raw_cea608_raw (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
g_assert (self->in_field != self->out_field);
n = gst_buffer_get_size (inbuf);
if (n & 1) {
GST_WARNING_OBJECT (self, "Invalid raw CEA608 buffer size");
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
n /= 2;
if (n > 3) {
GST_WARNING_OBJECT (self, "Too many CEA608 pairs %u. Truncating to %u", n,
3);
n = 3;
}
gst_buffer_set_size (outbuf, 2 * n);
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
/* EIA/CEA-608-B 8.4 Closed Caption Mode:
*
* When closed captioning is used on line 21, field 2,
* it shall conform to all of the applicable specifications and
* recommended practices as defined for field 1 services with the
* following differences:
*
* a) The non-printing character of the miscellaneous control-character pairs
* that fall in the range of 14h, 20h to 14h, 2Fh in field 1, shall be
* replaced with 15h, 20h to 15h, 2Fh when used in field 2.
*
* b) The non-printing character of the miscellaneous control-character pairs
* that fall in the range of 1Ch, 20h to 1Ch, 2Fh in field 1, shall be replaced
* with 1Dh, 20h to 1Dh, 2Fh when used in field 2.
*/
for (i = 0; i < n; i++) {
guint8 cc_data_1 = eia608_parity_strip (in.data[i * 2]);
guint8 cc_data_2 = eia608_parity_strip (in.data[i * 2 + 1]);
out.data[i * 2] = in.data[i * 2];
out.data[i * 2 + 1] = in.data[i * 2 + 1];
if (self->in_field == 0 && self->out_field == 1) {
if (cc_data_1 == 0x14 && cc_data_2 >= 0x20 && cc_data_2 <= 0x2f) {
out.data[i * 2] = 0x15;
} else if (cc_data_1 == 0x1c && cc_data_2 >= 0x20 && cc_data_2 <= 0x2f) {
out.data[i * 2] = 0x9d;
}
} else if (self->in_field == 1 && self->out_field == 0) {
if (cc_data_1 == 0x15 && cc_data_2 >= 0x20 && cc_data_2 <= 0x2f) {
out.data[i * 2] = 0x94;
} else if (cc_data_1 == 0x1d && cc_data_2 >= 0x20 && cc_data_2 <= 0x2f) {
out.data[i * 2] = 0x1c;
}
}
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea608_raw_cea708_cc_data (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
n = gst_buffer_get_size (inbuf);
if (n & 1) {
GST_WARNING_OBJECT (self, "Invalid raw CEA608 buffer size");
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
n /= 2;
if (n > 3) {
GST_WARNING_OBJECT (self, "Too many CEA608 pairs %u. Truncating to %u", n,
3);
n = 3;
}
gst_buffer_set_size (outbuf, 3 * n);
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
/* We don't know from which line offset it originally is */
for (i = 0; i < n; i++) {
out.data[i * 3] = self->in_field == 0 ? 0xfc : 0xfd;
out.data[i * 3 + 1] = in.data[i * 2];
out.data[i * 3 + 2] = in.data[i * 2 + 1];
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea608_raw_cea708_cdp (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo in, out;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint8 cc_data[MAX_CDP_PACKET_LEN];
in_fps_entry = cdp_fps_entry_from_fps (self->in_fps_n, self->in_fps_d);
if (!in_fps_entry || in_fps_entry->fps_n == 0)
g_assert_not_reached ();
if (inbuf) {
guint n = 0;
n = gst_buffer_get_size (inbuf);
if (n & 1) {
GST_WARNING_OBJECT (self, "Invalid raw CEA608 buffer size");
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
n /= 2;
if (n > in_fps_entry->max_cea608_count) {
GST_WARNING_OBJECT (self, "Too many CEA608 pairs %u. Truncating to %u",
n, in_fps_entry->max_cea608_count);
n = in_fps_entry->max_cea608_count;
}
gst_buffer_map (inbuf, &in, GST_MAP_READ);
if (self->in_field == 0) {
cc_buffer_push_separated (self->cc_buffer, in.data, in.size, NULL, 0,
NULL, 0);
} else {
cc_buffer_push_separated (self->cc_buffer, NULL, 0, in.data, in.size,
NULL, 0);
}
gst_buffer_unmap (inbuf, &in);
self->input_frames++;
}
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
g_assert_not_reached ();
if (!can_take_buffer (self, in_fps_entry, out_fps_entry,
tc_meta ? &tc_meta->tc : NULL, &self->current_output_timecode))
goto drop;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, TRUE, cc_data,
&cc_data_len);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
cc_data_len =
convert_cea708_cc_data_cea708_cdp_internal (self, cc_data, cc_data_len,
out.data, out.size, &self->current_output_timecode, out_fps_entry);
self->output_frames++;
gst_buffer_unmap (outbuf, &out);
out:
gst_buffer_set_size (outbuf, cc_data_len);
return GST_FLOW_OK;
drop:
cc_data_len = 0;
goto out;
}
static GstFlowReturn
convert_cea608_s334_1a_cea608_raw (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
guint cea608 = 0;
n = gst_buffer_get_size (inbuf);
if (n % 3 != 0) {
GST_WARNING_OBJECT (self, "Invalid S334-1A CEA608 buffer size");
n = n - (n % 3);
}
n /= 3;
if (n > 3) {
GST_WARNING_OBJECT (self, "Too many S334-1A CEA608 triplets %u", n);
n = 3;
}
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
for (i = 0; i < n; i++) {
if ((in.data[i * 3] & 0x80 && self->out_field == 0) ||
(!(in.data[i * 3] & 0x80) && self->out_field == 1)) {
out.data[cea608 * 2] = in.data[i * 3 + 1];
out.data[cea608 * 2 + 1] = in.data[i * 3 + 2];
cea608++;
}
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
gst_buffer_set_size (outbuf, 2 * cea608);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea608_s334_1a_cea708_cc_data (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
n = gst_buffer_get_size (inbuf);
if (n % 3 != 0) {
GST_WARNING_OBJECT (self, "Invalid S334-1A CEA608 buffer size");
n = n - (n % 3);
}
n /= 3;
if (n > 3) {
GST_WARNING_OBJECT (self, "Too many S334-1A CEA608 triplets %u", n);
n = 3;
}
gst_buffer_set_size (outbuf, 3 * n);
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
for (i = 0; i < n; i++) {
out.data[i * 3] = (in.data[i * 3] & 0x80) ? 0xfc : 0xfd;
out.data[i * 3 + 1] = in.data[i * 3 + 1];
out.data[i * 3 + 2] = in.data[i * 3 + 2];
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea608_s334_1a_cea708_cdp (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo in, out;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint cea608_1_len = 0, cea608_2_len = 0;
guint8 cc_data[MAX_CDP_PACKET_LEN];
guint8 cea608_1[MAX_CEA608_LEN], cea608_2[MAX_CEA608_LEN];
guint i, n;
in_fps_entry = cdp_fps_entry_from_fps (self->in_fps_n, self->in_fps_d);
if (!in_fps_entry || in_fps_entry->fps_n == 0)
g_assert_not_reached ();
if (inbuf) {
n = gst_buffer_get_size (inbuf);
if (n % 3 != 0) {
GST_WARNING_OBJECT (self, "Invalid S334-1A CEA608 buffer size");
n = n - (n % 3);
}
n /= 3;
if (n > in_fps_entry->max_cea608_count) {
GST_WARNING_OBJECT (self, "Too many S334-1A CEA608 triplets %u", n);
n = in_fps_entry->max_cea608_count;
}
gst_buffer_map (inbuf, &in, GST_MAP_READ);
for (i = 0; i < n; i++) {
guint byte1 = in.data[i * 3 + 1];
guint byte2 = in.data[i * 3 + 2];
if (in.data[i * 3] & 0x80) {
if (byte1 != 0x80 || byte2 != 0x80) {
cea608_1[cea608_1_len++] = byte1;
cea608_1[cea608_1_len++] = byte2;
}
} else {
if (byte1 != 0x80 || byte2 != 0x80) {
cea608_2[cea608_2_len++] = byte1;
cea608_2[cea608_2_len++] = byte2;
}
}
}
gst_buffer_unmap (inbuf, &in);
cc_buffer_push_separated (self->cc_buffer, cea608_1, cea608_1_len,
cea608_2, cea608_2_len, NULL, 0);
self->input_frames++;
}
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
g_assert_not_reached ();
if (!can_take_buffer (self, in_fps_entry, out_fps_entry,
tc_meta ? &tc_meta->tc : NULL, &self->current_output_timecode))
goto drop;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, TRUE, cc_data,
&cc_data_len);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
cc_data_len =
convert_cea708_cc_data_cea708_cdp_internal (self, cc_data, cc_data_len,
out.data, out.size, &self->current_output_timecode, out_fps_entry);
self->output_frames++;
gst_buffer_unmap (outbuf, &out);
out:
gst_buffer_set_size (outbuf, cc_data_len);
return GST_FLOW_OK;
drop:
cc_data_len = 0;
goto out;
}
static GstFlowReturn
convert_cea708_cc_data_cea608_raw (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
guint cea608 = 0;
n = gst_buffer_get_size (inbuf);
if (n % 3 != 0) {
GST_WARNING_OBJECT (self, "Invalid raw CEA708 buffer size");
n = n - (n % 3);
}
n /= 3;
if (n > 25) {
GST_WARNING_OBJECT (self, "Too many CEA708 triplets %u", n);
n = 25;
}
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
for (i = 0; i < n; i++) {
if ((in.data[i * 3] == 0xfc && self->out_field == 0) ||
(in.data[i * 3] == 0xfd && self->out_field == 1)) {
out.data[cea608 * 2] = in.data[i * 3 + 1];
out.data[cea608 * 2 + 1] = in.data[i * 3 + 2];
cea608++;
}
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
gst_buffer_set_size (outbuf, 2 * cea608);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea708_cc_data_cea608_s334_1a (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo in, out;
guint i, n;
guint cea608 = 0;
n = gst_buffer_get_size (inbuf);
if (n % 3 != 0) {
GST_WARNING_OBJECT (self, "Invalid raw CEA708 buffer size");
n = n - (n % 3);
}
n /= 3;
if (n > 25) {
GST_WARNING_OBJECT (self, "Too many CEA708 triplets %u", n);
n = 25;
}
gst_buffer_map (inbuf, &in, GST_MAP_READ);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
for (i = 0; i < n; i++) {
if (in.data[i * 3] == 0xfc || in.data[i * 3] == 0xfd) {
/* We have to assume a line offset of 0 */
out.data[cea608 * 3] = in.data[i * 3] == 0xfc ? 0x80 : 0x00;
out.data[cea608 * 3 + 1] = in.data[i * 3 + 1];
out.data[cea608 * 3 + 2] = in.data[i * 3 + 2];
cea608++;
}
}
gst_buffer_unmap (inbuf, &in);
gst_buffer_unmap (outbuf, &out);
gst_buffer_set_size (outbuf, 3 * cea608);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea708_cc_data_cea708_cdp (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo in, out;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint in_cc_data_len;
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint8 cc_data[MAX_CDP_PACKET_LEN];
guint8 *in_cc_data;
if (inbuf) {
gst_buffer_map (inbuf, &in, GST_MAP_READ);
in_cc_data = in.data;
in_cc_data_len = in.size;
self->input_frames++;
} else {
in_cc_data = NULL;
in_cc_data_len = 0;
}
in_fps_entry = cdp_fps_entry_from_fps (self->in_fps_n, self->in_fps_d);
if (!in_fps_entry || in_fps_entry->fps_n == 0)
g_assert_not_reached ();
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
g_assert_not_reached ();
cc_buffer_push_cc_data (self->cc_buffer, in_cc_data, in_cc_data_len);
if (inbuf)
gst_buffer_unmap (inbuf, &in);
if (!can_take_buffer (self, in_fps_entry, out_fps_entry,
tc_meta ? &tc_meta->tc : NULL, &self->current_output_timecode))
goto drop;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, TRUE, cc_data,
&cc_data_len);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
cc_data_len =
convert_cea708_cc_data_cea708_cdp_internal (self, cc_data, cc_data_len,
out.data, out.size, &self->current_output_timecode, out_fps_entry);
self->output_frames++;
gst_buffer_unmap (outbuf, &out);
out:
gst_buffer_set_size (outbuf, cc_data_len);
return GST_FLOW_OK;
drop:
cc_data_len = 0;
goto out;
}
static GstFlowReturn
convert_cea708_cdp_cea608_raw (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
guint cea608_len;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
if (!push_cdp_buffer (self, inbuf, &tc, &in_fps_entry)) {
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
out_fps_entry = in_fps_entry;
if (!can_take_buffer (self, in_fps_entry, out_fps_entry, &tc,
&self->current_output_timecode))
goto drop;
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
cea608_len = out.size;
if (self->out_field == 0) {
cc_buffer_take_separated (self->cc_buffer, out_fps_entry, out.data,
&cea608_len, NULL, 0, NULL, 0);
} else {
cc_buffer_take_separated (self->cc_buffer, out_fps_entry, NULL, 0, out.data,
&cea608_len, NULL, 0);
}
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
if (self->current_output_timecode.config.fps_n != 0 && !tc_meta) {
gst_buffer_add_video_time_code_meta (outbuf,
&self->current_output_timecode);
gst_video_time_code_increment_frame (&self->current_output_timecode);
}
out:
gst_buffer_set_size (outbuf, cea608_len);
return GST_FLOW_OK;
drop:
cea608_len = 0;
goto out;
}
static GstFlowReturn
convert_cea708_cdp_cea608_s334_1a (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
guint cc_data_len;
int s334_len;
guint i;
if (!push_cdp_buffer (self, inbuf, &tc, &in_fps_entry))
goto drop;
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
out_fps_entry = in_fps_entry;
if (!can_take_buffer (self, in_fps_entry, out_fps_entry, &tc,
&self->current_output_timecode))
goto drop;
gst_buffer_map (outbuf, &out, GST_MAP_READWRITE);
cc_data_len = out.size;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, FALSE,
out.data, &cc_data_len);
s334_len = drop_ccp_from_cc_data (out.data, cc_data_len);
if (s334_len < 0)
goto drop;
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;
}
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
gst_buffer_set_size (outbuf, s334_len);
if (self->current_output_timecode.config.fps_n != 0 && !tc_meta) {
gst_buffer_add_video_time_code_meta (outbuf,
&self->current_output_timecode);
gst_video_time_code_increment_frame (&self->current_output_timecode);
}
return GST_FLOW_OK;
drop:
gst_buffer_set_size (outbuf, 0);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea708_cdp_cea708_cc_data (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf, const GstVideoTimeCodeMeta * tc_meta)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
guint out_len = 0;
if (!push_cdp_buffer (self, inbuf, &tc, &in_fps_entry))
goto out;
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
out_fps_entry = in_fps_entry;
if (!can_take_buffer (self, in_fps_entry, out_fps_entry, &tc,
&self->current_output_timecode))
goto out;
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
out_len = (guint) out.size;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, TRUE, out.data,
&out_len);
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
if (self->current_output_timecode.config.fps_n != 0 && !tc_meta) {
gst_buffer_add_video_time_code_meta (outbuf,
&self->current_output_timecode);
gst_video_time_code_increment_frame (&self->current_output_timecode);
}
out:
gst_buffer_set_size (outbuf, out_len);
return GST_FLOW_OK;
}
static GstFlowReturn
convert_cea708_cdp_cea708_cdp (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
guint8 cc_data[MAX_CDP_PACKET_LEN];
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint out_len = 0;
if (!push_cdp_buffer (self, inbuf, &tc, &in_fps_entry))
goto out;
out_fps_entry = cdp_fps_entry_from_fps (self->out_fps_n, self->out_fps_d);
if (!out_fps_entry || out_fps_entry->fps_n == 0)
out_fps_entry = in_fps_entry;
if (!can_take_buffer (self, in_fps_entry, out_fps_entry, &tc,
&self->current_output_timecode))
goto out;
cc_buffer_take_cc_data (self->cc_buffer, out_fps_entry, TRUE, cc_data,
&cc_data_len);
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
out_len =
convert_cea708_cc_data_cea708_cdp_internal (self, cc_data, cc_data_len,
out.data, out.size, &self->current_output_timecode, out_fps_entry);
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
out:
gst_buffer_set_size (outbuf, out_len);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_cc_converter_transform (GstCCConverter * self, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstVideoTimeCodeMeta *tc_meta = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GST_DEBUG_OBJECT (self, "Converting %" GST_PTR_FORMAT " from %u to %u", inbuf,
self->input_caption_type, self->output_caption_type);
if (inbuf)
tc_meta = gst_buffer_get_video_time_code_meta (inbuf);
if (tc_meta) {
if (self->current_output_timecode.config.fps_n <= 0) {
/* XXX: this assumes the input time codes are well-formed and increase
* at the rate of one frame for each input buffer */
const struct cdp_fps_entry *in_fps_entry;
gint scale_n, scale_d;
in_fps_entry = cdp_fps_entry_from_fps (self->in_fps_n, self->in_fps_d);
if (!in_fps_entry || in_fps_entry->fps_n == 0)
scale_n = scale_d = 1;
else
get_framerate_output_scale (self, in_fps_entry, &scale_n, &scale_d);
interpolate_time_code_with_framerate (self, &tc_meta->tc,
self->out_fps_n, self->out_fps_d, scale_n, scale_d,
&self->current_output_timecode);
}
}
switch (self->input_caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
switch (self->output_caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
ret = convert_cea608_raw_cea608_s334_1a (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
ret = convert_cea608_raw_cea708_cc_data (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
ret = convert_cea608_raw_cea708_cdp (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
ret = convert_cea608_raw_cea608_raw (self, inbuf, outbuf);
break;
default:
g_assert_not_reached ();
break;
}
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
switch (self->output_caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
ret = convert_cea608_s334_1a_cea608_raw (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
ret = convert_cea608_s334_1a_cea708_cc_data (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
ret =
convert_cea608_s334_1a_cea708_cdp (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
default:
g_assert_not_reached ();
break;
}
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
switch (self->output_caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
ret = convert_cea708_cc_data_cea608_raw (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
ret = convert_cea708_cc_data_cea608_s334_1a (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
ret =
convert_cea708_cc_data_cea708_cdp (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
default:
g_assert_not_reached ();
break;
}
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
switch (self->output_caption_type) {
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
ret = convert_cea708_cdp_cea608_raw (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
ret =
convert_cea708_cdp_cea608_s334_1a (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
ret =
convert_cea708_cdp_cea708_cc_data (self, inbuf, outbuf, tc_meta);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:
ret = convert_cea708_cdp_cea708_cdp (self, inbuf, outbuf);
break;
default:
g_assert_not_reached ();
break;
}
break;
default:
g_assert_not_reached ();
break;
}
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (self, "returning %s", gst_flow_get_name (ret));
return ret;
}
GST_DEBUG_OBJECT (self, "Converted to %" GST_PTR_FORMAT, outbuf);
if (gst_buffer_get_size (outbuf) > 0) {
if (self->current_output_timecode.config.fps_n > 0) {
gst_buffer_add_video_time_code_meta (outbuf,
&self->current_output_timecode);
gst_video_time_code_increment_frame (&self->current_output_timecode);
}
return GST_FLOW_OK;
} else {
return GST_FLOW_OK;
}
}
static gboolean
gst_cc_converter_transform_meta (GstBaseTransform * base, GstBuffer * outbuf,
GstMeta * meta, GstBuffer * inbuf)
{
const GstMetaInfo *info = meta->info;
/* we do this manually for framerate scaling */
if (info->api == GST_VIDEO_TIME_CODE_META_API_TYPE)
return FALSE;
return GST_BASE_TRANSFORM_CLASS (parent_class)->transform_meta (base, outbuf,
meta, inbuf);
}
static gboolean
can_generate_output (GstCCConverter * self)
{
int input_frame_n, input_frame_d, output_frame_n, output_frame_d;
int output_time_cmp;
if (self->in_fps_n == 0 || self->out_fps_n == 0)
return FALSE;
/* compute the relative frame count for each */
if (!gst_util_fraction_multiply (self->in_fps_d, self->in_fps_n,
self->input_frames, 1, &input_frame_n, &input_frame_d))
/* we should never overflow */
g_assert_not_reached ();
if (!gst_util_fraction_multiply (self->out_fps_d, self->out_fps_n,
self->output_frames, 1, &output_frame_n, &output_frame_d))
/* we should never overflow */
g_assert_not_reached ();
output_time_cmp = gst_util_fraction_compare (input_frame_n, input_frame_d,
output_frame_n, output_frame_d);
if (output_time_cmp == 0) {
self->output_frames = 0;
self->input_frames = 0;
}
/* if the next output frame is at or before the current input frame */
if (output_time_cmp >= 0)
return TRUE;
return FALSE;
}
static void
reset_counters (GstCCConverter * self)
{
self->input_frames = 0;
self->output_frames = 1;
gst_video_time_code_clear (&self->current_output_timecode);
gst_clear_buffer (&self->previous_buffer);
cc_buffer_discard (self->cc_buffer);
}
static GstFlowReturn
drain_input (GstCCConverter * self)
{
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (self);
GstBaseTransform *trans = GST_BASE_TRANSFORM (self);
GstFlowReturn ret = GST_FLOW_OK;
guint cea608_1_len, cea608_2_len, ccp_len;
cc_buffer_get_stored_size (self->cc_buffer, &cea608_1_len, &cea608_2_len,
&ccp_len);
while (ccp_len > 0 || cea608_1_len > 0 || cea608_2_len > 0
|| can_generate_output (self)) {
GstBuffer *outbuf;
if (!self->previous_buffer) {
GST_WARNING_OBJECT (self, "Attempt to draining without a previous "
"buffer. Aborting");
return GST_FLOW_OK;
}
outbuf = gst_buffer_new_allocate (NULL, MAX_CDP_PACKET_LEN, NULL);
if (bclass->copy_metadata) {
if (!bclass->copy_metadata (trans, self->previous_buffer, outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (self, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
}
ret = gst_cc_converter_transform (self, NULL, outbuf);
cc_buffer_get_stored_size (self->cc_buffer, &cea608_1_len, &cea608_2_len,
&ccp_len);
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)
{
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (base);
GstCCConverter *self = GST_CCCONVERTER (base);
GstBuffer *inbuf = base->queued_buf;
GstFlowReturn ret;
*outbuf = NULL;
base->queued_buf = NULL;
if (!inbuf && !can_generate_output (self)) {
return GST_FLOW_OK;
}
if (gst_base_transform_is_passthrough (base)) {
*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;
if (inbuf)
gst_buffer_replace (&self->previous_buffer, inbuf);
if (bclass->copy_metadata) {
if (!bclass->copy_metadata (base, self->previous_buffer, *outbuf)) {
/* something failed, post a warning */
GST_ELEMENT_WARNING (self, STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
}
ret = gst_cc_converter_transform (self, inbuf, *outbuf);
if (gst_buffer_get_size (*outbuf) <= 0) {
gst_buffer_unref (*outbuf);
*outbuf = NULL;
if (inbuf && GST_BUFFER_PTS_IS_VALID (inbuf)) {
GstClockTime dur = 0;
GstEvent *gap;
GST_TRACE_OBJECT (self, "Empty generated output for input %"
GST_PTR_FORMAT, inbuf);
if (GST_BUFFER_DURATION_IS_VALID (inbuf)) {
dur = GST_BUFFER_DURATION (inbuf);
} else if (self->in_fps_n > 0 && self->in_fps_d > 0) {
dur = gst_util_uint64_scale (GST_SECOND,
self->in_fps_d, self->in_fps_n);
}
gap = gst_event_new_gap (GST_BUFFER_PTS (inbuf), dur);
gst_pad_push_event (GST_BASE_TRANSFORM_SRC_PAD (self), gap);
}
ret = GST_FLOW_OK;
}
if (inbuf)
gst_buffer_unref (inbuf);
}
return ret;
no_buffer:
{
if (inbuf)
gst_buffer_unref (inbuf);
*outbuf = NULL;
GST_WARNING_OBJECT (self, "could not allocate buffer");
return GST_FLOW_ERROR;
}
}
static gboolean
gst_cc_converter_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstCCConverter *self = GST_CCCONVERTER (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (self, "received EOS");
drain_input (self);
/* fallthrough */
case GST_EVENT_FLUSH_START:
reset_counters (self);
break;
default:
break;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
}
static gboolean
gst_cc_converter_start (GstBaseTransform * base)
{
GstCCConverter *self = GST_CCCONVERTER (base);
/* Resetting this is not really needed but makes debugging easier */
self->cdp_hdr_sequence_cntr = 0;
self->current_output_timecode = (GstVideoTimeCode) GST_VIDEO_TIME_CODE_INIT;
reset_counters (self);
return TRUE;
}
static gboolean
gst_cc_converter_stop (GstBaseTransform * base)
{
GstCCConverter *self = GST_CCCONVERTER (base);
gst_video_time_code_clear (&self->current_output_timecode);
gst_clear_buffer (&self->previous_buffer);
return TRUE;
}
static void
gst_cc_converter_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCCConverter *filter = GST_CCCONVERTER (object);
switch (prop_id) {
case PROP_CDP_MODE:
filter->cdp_mode = g_value_get_flags (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_cc_converter_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstCCConverter *filter = GST_CCCONVERTER (object);
switch (prop_id) {
case PROP_CDP_MODE:
g_value_set_flags (value, filter->cdp_mode);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_cc_converter_finalize (GObject * object)
{
GstCCConverter *self = GST_CCCONVERTER (object);
gst_clear_object (&self->cc_buffer);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_cc_converter_class_init (GstCCConverterClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseTransformClass *basetransform_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
basetransform_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_cc_converter_set_property;
gobject_class->get_property = gst_cc_converter_get_property;
gobject_class->finalize = gst_cc_converter_finalize;
/**
* GstCCConverter:cdp-mode
*
* Only insert the selection sections into CEA 708 CDP packets.
*
* Various software does not handle any other information than CC data
* contained in CDP packets and might fail parsing the packets otherwise.
*
* Since: 1.20
*/
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_CDP_MODE, g_param_spec_flags ("cdp-mode",
"CDP Mode",
"Select which CDP sections to store in CDP packets",
GST_TYPE_CC_CONVERTER_CDP_MODE, DEFAULT_CDP_MODE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class,
"Closed Caption Converter",
"Filter/ClosedCaption",
"Converts Closed Captions between different formats",
"Sebastian Dröge <sebastian@centricular.com>");
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
basetransform_class->start = GST_DEBUG_FUNCPTR (gst_cc_converter_start);
basetransform_class->stop = GST_DEBUG_FUNCPTR (gst_cc_converter_stop);
basetransform_class->sink_event =
GST_DEBUG_FUNCPTR (gst_cc_converter_sink_event);
basetransform_class->transform_size =
GST_DEBUG_FUNCPTR (gst_cc_converter_transform_size);
basetransform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_cc_converter_transform_caps);
basetransform_class->fixate_caps =
GST_DEBUG_FUNCPTR (gst_cc_converter_fixate_caps);
basetransform_class->set_caps = GST_DEBUG_FUNCPTR (gst_cc_converter_set_caps);
basetransform_class->transform_meta =
GST_DEBUG_FUNCPTR (gst_cc_converter_transform_meta);
basetransform_class->generate_output =
GST_DEBUG_FUNCPTR (gst_cc_converter_generate_output);
basetransform_class->passthrough_on_same_caps = TRUE;
GST_DEBUG_CATEGORY_INIT (gst_cc_converter_debug, "ccconverter",
0, "Closed Caption converter");
gst_type_mark_as_plugin_api (GST_TYPE_CC_CONVERTER_CDP_MODE, 0);
}
static void
gst_cc_converter_init (GstCCConverter * self)
{
self->cdp_mode = DEFAULT_CDP_MODE;
self->in_field = 0;
self->out_field = 0;
self->cc_buffer = cc_buffer_new ();
cc_buffer_set_output_padding (self->cc_buffer, TRUE, FALSE);
}
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