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gstreamer/ext/closedcaption/gstccconverter.c
Matthew Waters ebd1b2c929 ccconverter: write the cdp timecode data correctly 
We were mixing up the tens part with the unit parts all over the place.

e.g. 12 seconds would be encoded as 0x21 instead of the correct 0x12

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1400>
2020-07-03 06:54:46 +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 "gstccconverter.h"
GST_DEBUG_CATEGORY_STATIC (gst_cc_converter_debug);
#define GST_CAT_DEFAULT gst_cc_converter_debug
/* 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"
#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));
G_DEFINE_TYPE (GstCCConverter, gst_cc_converter, GST_TYPE_BASE_TRANSFORM);
#define parent_class gst_cc_converter_parent_class
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");
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}");
GstCCConverter *self = GST_CCCONVERTER (base);
guint i, n;
GstCaps *res, *templ;
templ = gst_pad_get_pad_template_caps (base->srcpad);
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")) {
if (direction == GST_PAD_SRC) {
/* 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 */
GstCaps *tmp;
tmp = gst_caps_make_writable (gst_static_caps_get (&non_cdp_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));
}
} 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));
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));
}
}
} 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));
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));
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));
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));
}
}
} 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");
gst_caps_set_value (tmp, "framerate", cdp_framerate);
res = gst_caps_merge (res, 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));
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));
}
}
} 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);
gst_caps_unref (filter);
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);
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;
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;
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;
gst_video_time_code_clear (&self->current_output_timecode);
/* 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;
}
}
struct cdp_fps_entry
{
guint8 fps_idx;
guint fps_n, fps_d;
guint max_cc_count;
guint max_ccp_count;
guint max_cea608_count;
};
static const struct cdp_fps_entry cdp_fps_table[] = {
{0x1f, 24000, 1001, 25, 22, 3 /* FIXME: alternating max cea608 count! */ },
{0x2f, 24, 1, 25, 22, 2},
{0x3f, 25, 1, 24, 22, 2},
{0x4f, 30000, 1001, 20, 18, 2},
{0x5f, 30, 1, 20, 18, 2},
{0x6f, 50, 1, 12, 11, 1},
{0x7f, 60000, 1001, 10, 9, 1},
{0x8f, 60, 1, 10, 9, 1},
};
static const struct cdp_fps_entry null_fps_entry = { 0, 0, 0, 0 };
static const struct cdp_fps_entry *
cdp_fps_entry_from_id (guint8 id)
{
int i;
for (i = 0; i < G_N_ELEMENTS (cdp_fps_table); i++) {
if (cdp_fps_table[i].fps_idx == id)
return &cdp_fps_table[i];
}
return &null_fps_entry;
}
static const struct cdp_fps_entry *
cdp_fps_entry_from_fps (guint fps_n, guint fps_d)
{
int i;
for (i = 0; i < G_N_ELEMENTS (cdp_fps_table); i++) {
if (cdp_fps_table[i].fps_n == fps_n && cdp_fps_table[i].fps_d == fps_d)
return &cdp_fps_table[i];
}
return &null_fps_entry;
}
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 (tc != NULL, FALSE);
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;
}
/* remove padding bytes from a cc_data packet. Returns the length of the new
* data in @cc_data */
static guint
compact_cc_data (guint8 * cc_data, guint cc_data_len)
{
gboolean started_ccp = FALSE;
guint out_len = 0;
guint i;
if (cc_data_len % 3 != 0) {
GST_WARNING ("Invalid cc_data buffer size");
cc_data_len = cc_data_len - (cc_data_len % 3);
}
for (i = 0; i < cc_data_len / 3; i++) {
gboolean cc_valid = (cc_data[i * 3] & 0x04) == 0x04;
guint8 cc_type = cc_data[i * 3] & 0x03;
if (!started_ccp && (cc_type == 0x00 || cc_type == 0x01)) {
if (cc_valid) {
/* copy over valid 608 data */
cc_data[out_len++] = cc_data[i * 3];
cc_data[out_len++] = cc_data[i * 3 + 1];
cc_data[out_len++] = cc_data[i * 3 + 2];
}
continue;
}
if (cc_type & 0x10)
started_ccp = TRUE;
if (!cc_valid)
continue;
if (cc_type == 0x00 || cc_type == 0x01) {
GST_WARNING ("Invalid cc_data. cea608 bytes after cea708");
return 0;
}
cc_data[out_len++] = cc_data[i * 3];
cc_data[out_len++] = cc_data[i * 3 + 1];
cc_data[out_len++] = cc_data[i * 3 + 2];
}
GST_LOG ("compacted cc_data from %u to %u", cc_data_len, out_len);
return out_len;
}
static gint
cc_data_extract_cea608 (guint8 * cc_data, guint cc_data_len,
guint8 * cea608_field1, guint * cea608_field1_len,
guint8 * cea608_field2, guint * cea608_field2_len)
{
guint i, field_1_len = 0, field_2_len = 0;
if (cea608_field1_len) {
field_1_len = *cea608_field1_len;
*cea608_field1_len = 0;
}
if (cea608_field2_len) {
field_2_len = *cea608_field2_len;
*cea608_field2_len = 0;
}
if (cc_data_len % 3 != 0) {
GST_WARNING ("Invalid cc_data buffer size %u. Truncating to a multiple "
"of 3", cc_data_len);
cc_data_len = cc_data_len - (cc_data_len % 3);
}
for (i = 0; i < cc_data_len / 3; i++) {
gboolean cc_valid = (cc_data[i * 3] & 0x04) == 0x04;
guint8 cc_type = cc_data[i * 3] & 0x03;
GST_TRACE ("0x%02x 0x%02x 0x%02x, valid: %u, type: 0b%u%u",
cc_data[i * 3 + 0], cc_data[i * 3 + 1], cc_data[i * 3 + 2], cc_valid,
cc_type & 0x2, cc_type & 0x1);
if (cc_type == 0x00) {
if (!cc_valid)
continue;
if (cea608_field1 && cea608_field1_len) {
if (*cea608_field1_len + 2 > field_1_len) {
GST_WARNING ("Too many cea608 input bytes %u for field 1",
*cea608_field1_len + 2);
return -1;
}
cea608_field1[(*cea608_field1_len)++] = cc_data[i * 3 + 1];
cea608_field1[(*cea608_field1_len)++] = cc_data[i * 3 + 2];
}
} else if (cc_type == 0x01) {
if (!cc_valid)
continue;
if (cea608_field2 && cea608_field2_len) {
if (*cea608_field2_len + 2 > field_2_len) {
GST_WARNING ("Too many cea608 input bytes %u for field 2",
*cea608_field2_len + 2);
return -1;
}
cea608_field2[(*cea608_field2_len)++] = cc_data[i * 3 + 1];
cea608_field2[(*cea608_field2_len)++] = cc_data[i * 3 + 2];
}
} else {
/* all cea608 packets must be at the beginning of a cc_data */
break;
}
}
g_assert_cmpint (i * 3, <=, cc_data_len);
GST_LOG ("Extracted cea608-1 of length %u and cea608-2 of length %u",
VAL_OR_0 (cea608_field1_len), VAL_OR_0 (cea608_field2_len));
return i * 3;
}
static void
store_cc_data (GstCCConverter * self, const guint8 * ccp_data,
guint ccp_data_len, const guint8 * cea608_1, guint cea608_1_len,
const guint8 * cea608_2, guint cea608_2_len)
{
GST_DEBUG_OBJECT (self, "holding data of len ccp:%u, cea608 1:%u, "
"cea608 2:%u until next input buffer", ccp_data_len, cea608_1_len,
cea608_2_len);
if (ccp_data && ccp_data_len > 0) {
memcpy (self->scratch_ccp, ccp_data, ccp_data_len);
self->scratch_ccp_len = ccp_data_len;
} else {
self->scratch_ccp_len = 0;
}
g_assert_cmpint (self->scratch_ccp_len, <, sizeof (self->scratch_ccp));
if (cea608_1 && cea608_1_len > 0) {
memcpy (self->scratch_cea608_1, cea608_1, cea608_1_len);
self->scratch_cea608_1_len = cea608_1_len;
} else {
self->scratch_cea608_1_len = 0;
}
g_assert_cmpint (self->scratch_cea608_1_len, <,
sizeof (self->scratch_cea608_1));
if (cea608_2 && cea608_2_len > 0) {
memcpy (self->scratch_cea608_2, cea608_2, cea608_2_len);
self->scratch_cea608_2_len = cea608_2_len;
} else {
self->scratch_cea608_2_len = 0;
}
g_assert_cmpint (self->scratch_cea608_2_len, <,
sizeof (self->scratch_cea608_2));
}
static gboolean
combine_cc_data (GstCCConverter * self, gboolean pad_cea608,
const struct cdp_fps_entry *out_fps_entry, const guint8 * ccp_data,
guint ccp_data_len, const guint8 * cea608_1, guint cea608_1_len,
const guint8 * cea608_2, guint cea608_2_len, guint8 * out, guint * out_size)
{
guint i = 0, out_i = 0, max_size = 0, cea608_1_i = 0, cea608_2_i = 0;
guint cea608_output_count;
guint total_cea608_1_count, total_cea608_2_count;
g_assert (out);
g_assert (out_size);
g_assert (!ccp_data || ccp_data_len % 3 == 0);
g_assert (!cea608_1 || cea608_1_len % 2 == 0);
g_assert (!cea608_2 || cea608_2_len % 2 == 0);
cea608_1_len /= 2;
cea608_2_len /= 2;
#if 0
/* FIXME: if cea608 field 2 is generated, field 1 needs to be generated,
* However that is not possible for 60fps (where only one cea608 field fits)
* without adding previous output buffer tracking */
g_assert_cmpint (cea608_1_len >= cea608_2_len);
#endif
g_assert_cmpint (cea608_1_len + cea608_2_len, <=,
out_fps_entry->max_cea608_count);
total_cea608_1_count = cea608_1_len;
total_cea608_2_count = cea608_2_len;
#if 0
/* FIXME: if cea608 field 2 is generated, field 1 needs to be generated. */
if (cea608_1_len < cea608_2_len)
total_cea608_1_count += cea608_2_len - cea608_1_len;
#endif
max_size = ccp_data_len + (total_cea608_1_count + total_cea608_2_count) * 3;
if (*out_size < max_size) {
GST_WARNING_OBJECT (self, "Output data too small (%u < %u)", *out_size,
max_size);
return FALSE;
}
/* FIXME: interlacing, tff, rff, ensuring cea608 field1 is generated if
* field2 exists even across packets */
cea608_output_count = cea608_1_len + cea608_2_len;
if (pad_cea608) {
for (i = total_cea608_1_count + total_cea608_2_count;
i < out_fps_entry->max_cea608_count; i++) {
/* try to pad evenly */
if (i > cea608_1_len / 2)
total_cea608_1_count++;
else
total_cea608_2_count++;
cea608_output_count++;
}
}
GST_LOG ("writing %u cea608-1 fields and %u cea608-2 fields",
total_cea608_1_count, total_cea608_2_count);
g_assert_cmpint (total_cea608_1_count + total_cea608_2_count, <=,
out_fps_entry->max_cea608_count);
while (cea608_1_i + cea608_2_i < cea608_output_count) {
if (cea608_1_i < cea608_1_len) {
out[out_i++] = 0xfc;
out[out_i++] = cea608_1[cea608_1_i * 2];
out[out_i++] = cea608_1[cea608_1_i * 2 + 1];
cea608_1_i++;
i++;
} else if (cea608_1_i < total_cea608_1_count) {
out[out_i++] = 0xf8;
out[out_i++] = 0x80;
out[out_i++] = 0x80;
cea608_1_i++;
i++;
}
if (cea608_2_i < cea608_2_len) {
out[out_i++] = 0xfd;
out[out_i++] = cea608_2[cea608_2_i * 2];
out[out_i++] = cea608_2[cea608_2_i * 2 + 1];
cea608_2_i++;
i++;
} else if (cea608_2_i < total_cea608_2_count) {
out[out_i++] = 0xf9;
out[out_i++] = 0x80;
out[out_i++] = 0x80;
cea608_2_i++;
i++;
}
}
g_assert_cmpint (out_i / 3, <=, out_fps_entry->max_cea608_count);
*out_size = out_i;
if (ccp_data) {
memcpy (&out[out_i], ccp_data, ccp_data_len);
*out_size += ccp_data_len;
}
g_assert_cmpint (*out_size, <, MAX_CDP_PACKET_LEN);
return TRUE;
}
/* takes cc_data cea608_1, cea608_2 and attempts to fit it into a hypothetical
* output packet. Any leftover data is stored for later addition. Returns
* whether any output can be generated. @ccp_data_len, @cea608_1_len,
* @cea608_2_len are also updated to reflect the size of that data to add to
* the output packet */
static gboolean
fit_and_scale_cc_data (GstCCConverter * self,
const struct cdp_fps_entry *in_fps_entry,
const struct cdp_fps_entry *out_fps_entry, const guint8 * ccp_data,
guint * ccp_data_len, const guint8 * cea608_1, guint * cea608_1_len,
const guint8 * cea608_2, guint * cea608_2_len, const GstVideoTimeCode * tc)
{
if (!in_fps_entry || in_fps_entry->fps_n == 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 ();
}
/* This is slightly looser than checking for the exact framerate as the cdp
* spec allow for 0.1% difference between framerates to be considered equal */
if (in_fps_entry->max_cc_count == out_fps_entry->max_cc_count) {
if (tc && tc->config.fps_n != 0)
interpolate_time_code_with_framerate (self, tc, out_fps_entry->fps_n,
out_fps_entry->fps_d, 1, 1, &self->current_output_timecode);
} else {
int input_frame_n, input_frame_d, output_frame_n, output_frame_d;
int output_time_cmp, scale_n, scale_d, rate_cmp;
/* TODO: handle input discont */
/* 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);
/* compute the relative rates of the two framerates */
get_framerate_output_scale (self, in_fps_entry, &scale_n, &scale_d);
rate_cmp = gst_util_fraction_compare (scale_n, scale_d, 1, 1);
GST_TRACE_OBJECT (self, "performing framerate conversion at scale %d/%d "
"of cc data of with sizes, ccp:%u, cea608-1:%u, cea608-2:%u", scale_n,
scale_d, VAL_OR_0 (ccp_data_len), VAL_OR_0 (cea608_1_len),
VAL_OR_0 (cea608_2_len));
if (rate_cmp == 0) {
/* we are not scaling. Should never happen with current conditions
* above */
g_assert_not_reached ();
} else if (output_time_cmp < 0) {
/* we can't generate an output yet */
guint cd_len = ccp_data_len ? *ccp_data_len : 0;
guint c1_len = cea608_1_len ? *cea608_1_len : 0;
guint c2_len = cea608_2_len ? *cea608_2_len : 0;
store_cc_data (self, ccp_data, cd_len, cea608_1, c1_len, cea608_2,
c2_len);
if (ccp_data_len)
*ccp_data_len = 0;
if (cea608_1_len)
*cea608_1_len = 0;
if (cea608_2_len)
*cea608_2_len = 0;
return FALSE;
} else if (rate_cmp != 0) {
/* we are changing the framerate and may overflow the max output packet
* size. Split them where necessary. */
gint extra_ccp = 0, extra_cea608_1 = 0, extra_cea608_2 = 0;
gint ccp_off = 0, cea608_1_off = 0, cea608_2_off = 0;
if (output_time_cmp == 0) {
/* we have completed a cycle and can reset our counters to avoid
* overflow. Anything that fits into the output packet will be written */
GST_LOG_OBJECT (self, "cycle completed, resetting frame counters");
self->scratch_ccp_len = 0;
self->scratch_cea608_1_len = 0;
self->scratch_cea608_2_len = 0;
self->input_frames = 0;
self->output_frames = 0;
}
if (ccp_data_len) {
extra_ccp = *ccp_data_len - 3 * out_fps_entry->max_ccp_count;
extra_ccp = MAX (0, extra_ccp);
ccp_off = *ccp_data_len - extra_ccp;
}
if (cea608_1_len) {
extra_cea608_1 = *cea608_1_len - 2 * out_fps_entry->max_cea608_count;
extra_cea608_1 = MAX (0, extra_cea608_1);
cea608_1_off = *cea608_1_len - extra_cea608_1;
}
if (cea608_2_len) {
/* this prefers using field1 data first. This may not be quite correct */
if (extra_cea608_1 > 0) {
/* all the cea608 space is for field 1 */
extra_cea608_2 = *cea608_2_len;
cea608_2_off = 0;
} else if (cea608_1_len) {
/* cea608 space is shared between field 1 and field 2 */
extra_cea608_2 =
*cea608_1_len + *cea608_2_len -
2 * out_fps_entry->max_cea608_count;
extra_cea608_2 = MAX (0, extra_cea608_2);
cea608_2_off = *cea608_2_len - extra_cea608_2;
} else {
/* all of the cea608 space is for field 2 */
extra_cea608_2 = *cea608_2_len - 2 * out_fps_entry->max_cea608_count;
extra_cea608_2 = MAX (0, extra_cea608_2);
cea608_2_off = *cea608_2_len - extra_cea608_2;
}
}
if (extra_ccp > 0 || extra_cea608_1 > 0 || extra_cea608_2 > 0) {
/* packet would overflow, push extra bytes into the next packet */
GST_DEBUG_OBJECT (self, "buffer would overflow by %u ccp bytes, "
"%u cea608 field 1 bytes, or %u cea608 field 2 bytes", extra_ccp,
extra_cea608_1, extra_cea608_2);
store_cc_data (self, &ccp_data[ccp_off], extra_ccp,
&cea608_1[cea608_1_off], extra_cea608_1, &cea608_2[cea608_2_off],
extra_cea608_2);
if (ccp_data_len)
*ccp_data_len = MIN (*ccp_data_len, ccp_off);
if (cea608_1_len)
*cea608_1_len = MIN (*cea608_1_len, cea608_1_off);
if (cea608_2_len)
*cea608_2_len = MIN (*cea608_2_len, cea608_2_off);
} else {
GST_DEBUG_OBJECT (self, "section sizes of %u ccp bytes, "
"%u cea608 field 1 bytes, and %u cea608 field 2 bytes fit within "
"output packet", VAL_OR_0 (ccp_data_len), VAL_OR_0 (cea608_1_len),
VAL_OR_0 (cea608_2_len));
self->scratch_ccp_len = 0;
self->scratch_cea608_1_len = 0;
self->scratch_cea608_2_len = 0;
}
} else {
g_assert_not_reached ();
}
if (tc && tc->config.fps_n != 0)
interpolate_time_code_with_framerate (self, tc, out_fps_entry->fps_n,
out_fps_entry->fps_d, scale_n, scale_d,
&self->current_output_timecode);
}
g_assert_cmpint (VAL_OR_0 (ccp_data_len) + (VAL_OR_0 (cea608_1_len) +
VAL_OR_0 (cea608_2_len)) / 2 * 3, <=,
3 * out_fps_entry->max_cc_count);
GST_DEBUG_OBJECT (self, "write out packet with lengths ccp:%u, cea608-1:%u, "
"cea608-2:%u", VAL_OR_0 (ccp_data_len), VAL_OR_0 (cea608_1_len),
VAL_OR_0 (cea608_2_len));
return TRUE;
}
/* Converts raw CEA708 cc_data and an optional timecode into CDP */
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)
{
GstByteWriter bw;
guint8 flags, checksum;
guint i, len;
GST_DEBUG_OBJECT (self, "writing out cdp packet from cc_data with length %u",
cc_data_len);
gst_byte_writer_init_with_data (&bw, cdp, cdp_len, FALSE);
gst_byte_writer_put_uint16_be_unchecked (&bw, 0x9669);
/* Write a length of 0 for now */
gst_byte_writer_put_uint8_unchecked (&bw, 0);
gst_byte_writer_put_uint8_unchecked (&bw, fps_entry->fps_idx);
if (cc_data_len / 3 > fps_entry->max_cc_count) {
GST_WARNING_OBJECT (self, "Too many cc_data triplets for framerate: %u. "
"Truncating to %u", cc_data_len / 3, fps_entry->max_cc_count);
cc_data_len = 3 * fps_entry->max_cc_count;
}
/* ccdata_present | caption_service_active */
flags = 0x42;
/* time_code_present */
if (tc && tc->config.fps_n > 0)
flags |= 0x80;
/* reserved */
flags |= 0x01;
gst_byte_writer_put_uint8_unchecked (&bw, flags);
gst_byte_writer_put_uint16_be_unchecked (&bw, self->cdp_hdr_sequence_cntr);
if (tc && tc->config.fps_n > 0) {
guint8 u8;
gst_byte_writer_put_uint8_unchecked (&bw, 0x71);
/* reserved 11 - 2 bits */
u8 = 0xc0;
/* tens of hours - 2 bits */
u8 |= ((tc->hours / 10) & 0x3) << 4;
/* units of hours - 4 bits */
u8 |= (tc->hours % 10) & 0xf;
gst_byte_writer_put_uint8_unchecked (&bw, u8);
/* reserved 1 - 1 bit */
u8 = 0x80;
/* tens of minutes - 3 bits */
u8 |= ((tc->minutes / 10) & 0x7) << 4;
/* units of minutes - 4 bits */
u8 |= (tc->minutes % 10) & 0xf;
gst_byte_writer_put_uint8_unchecked (&bw, u8);
/* field flag - 1 bit */
u8 = tc->field_count < 2 ? 0x00 : 0x80;
/* tens of seconds - 3 bits */
u8 |= ((tc->seconds / 10) & 0x7) << 4;
/* units of seconds - 4 bits */
u8 |= (tc->seconds % 10) & 0xf;
gst_byte_writer_put_uint8_unchecked (&bw, u8);
/* drop frame flag - 1 bit */
u8 = (tc->config.flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) ? 0x80 :
0x00;
/* reserved0 - 1 bit */
/* tens of frames - 2 bits */
u8 |= ((tc->frames / 10) & 0x3) << 4;
/* units of frames 4 bits */
u8 |= (tc->frames % 10) & 0xf;
gst_byte_writer_put_uint8_unchecked (&bw, u8);
}
gst_byte_writer_put_uint8_unchecked (&bw, 0x72);
gst_byte_writer_put_uint8_unchecked (&bw, 0xe0 | fps_entry->max_cc_count);
gst_byte_writer_put_data_unchecked (&bw, cc_data, cc_data_len);
while (fps_entry->max_cc_count > cc_data_len / 3) {
gst_byte_writer_put_uint8_unchecked (&bw, 0xfa);
gst_byte_writer_put_uint8_unchecked (&bw, 0x00);
gst_byte_writer_put_uint8_unchecked (&bw, 0x00);
cc_data_len += 3;
}
gst_byte_writer_put_uint8_unchecked (&bw, 0x74);
gst_byte_writer_put_uint16_be_unchecked (&bw, self->cdp_hdr_sequence_cntr);
self->cdp_hdr_sequence_cntr++;
/* We calculate the checksum afterwards */
gst_byte_writer_put_uint8_unchecked (&bw, 0);
len = gst_byte_writer_get_pos (&bw);
gst_byte_writer_set_pos (&bw, 2);
gst_byte_writer_put_uint8_unchecked (&bw, len);
checksum = 0;
for (i = 0; i < len; i++) {
checksum += cdp[i];
}
checksum &= 0xff;
checksum = 256 - checksum;
cdp[len - 1] = checksum;
return len;
}
/* Converts CDP into raw CEA708 cc_data */
static guint
convert_cea708_cdp_cea708_cc_data_internal (GstCCConverter * self,
const guint8 * cdp, guint cdp_len, guint8 cc_data[MAX_CDP_PACKET_LEN],
GstVideoTimeCode * tc, const struct cdp_fps_entry **out_fps_entry)
{
GstByteReader br;
guint16 u16;
guint8 u8;
guint8 flags;
guint len = 0;
const struct cdp_fps_entry *fps_entry;
*out_fps_entry = &null_fps_entry;
memset (tc, 0, sizeof (*tc));
/* Header + footer length */
if (cdp_len < 11) {
GST_WARNING_OBJECT (self, "cdp packet too short (%u). expected at "
"least %u", cdp_len, 11);
return 0;
}
gst_byte_reader_init (&br, cdp, cdp_len);
u16 = gst_byte_reader_get_uint16_be_unchecked (&br);
if (u16 != 0x9669) {
GST_WARNING_OBJECT (self, "cdp packet does not have initial magic bytes "
"of 0x9669");
return 0;
}
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if (u8 != cdp_len) {
GST_WARNING_OBJECT (self, "cdp packet length (%u) does not match passed "
"in value (%u)", u8, cdp_len);
return 0;
}
u8 = gst_byte_reader_get_uint8_unchecked (&br);
fps_entry = cdp_fps_entry_from_id (u8);
if (!fps_entry || fps_entry->fps_n == 0) {
GST_WARNING_OBJECT (self, "cdp packet does not have a valid framerate "
"id (0x%02x", u8);
return 0;
}
flags = gst_byte_reader_get_uint8_unchecked (&br);
/* No cc_data? */
if ((flags & 0x40) == 0) {
GST_DEBUG_OBJECT (self, "cdp packet does have any cc_data");
return 0;
}
/* cdp_hdr_sequence_cntr */
gst_byte_reader_skip_unchecked (&br, 2);
/* time_code_present */
if (flags & 0x80) {
guint8 hours, minutes, seconds, frames, fields;
gboolean drop_frame;
if (gst_byte_reader_get_remaining (&br) < 5) {
GST_WARNING_OBJECT (self, "cdp packet does not have enough data to "
"contain a timecode (%u). Need at least 5 bytes",
gst_byte_reader_get_remaining (&br));
return 0;
}
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if (u8 != 0x71) {
GST_WARNING_OBJECT (self, "cdp packet does not have timecode start byte "
"of 0x71, found 0x%02x", u8);
return 0;
}
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if ((u8 & 0xc0) != 0xc0) {
GST_WARNING_OBJECT (self, "reserved bits are not 0xc0, found 0x%02x", u8);
return 0;
}
hours = ((u8 >> 4) & 0x3) * 10 + (u8 & 0xf);
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if ((u8 & 0x80) != 0x80) {
GST_WARNING_OBJECT (self, "reserved bit is not 0x80, found 0x%02x", u8);
return 0;
}
minutes = ((u8 >> 4) & 0x7) * 10 + (u8 & 0xf);
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if (u8 & 0x80)
fields = 2;
else
fields = 1;
seconds = ((u8 >> 4) & 0x7) * 10 + (u8 & 0xf);
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if (u8 & 0x40) {
GST_WARNING_OBJECT (self, "reserved bit is not 0x0, found 0x%02x", u8);
return 0;
}
drop_frame = ! !(u8 & 0x80);
frames = ((u8 >> 4) & 0x3) * 10 + (u8 & 0xf);
gst_video_time_code_init (tc, fps_entry->fps_n, fps_entry->fps_d, NULL,
drop_frame ? GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME :
GST_VIDEO_TIME_CODE_FLAGS_NONE, hours, minutes, seconds, frames,
fields);
}
/* ccdata_present */
if (flags & 0x40) {
guint8 cc_count;
if (gst_byte_reader_get_remaining (&br) < 2) {
GST_WARNING_OBJECT (self, "not enough data to contain valid cc_data");
return 0;
}
u8 = gst_byte_reader_get_uint8_unchecked (&br);
if (u8 != 0x72) {
GST_WARNING_OBJECT (self, "missing cc_data start code of 0x72, "
"found 0x%02x", u8);
return 0;
}
cc_count = gst_byte_reader_get_uint8_unchecked (&br);
if ((cc_count & 0xe0) != 0xe0) {
GST_WARNING_OBJECT (self, "reserved bits are not 0xe0, found 0x%02x", u8);
return 0;
}
cc_count &= 0x1f;
len = 3 * cc_count;
if (gst_byte_reader_get_remaining (&br) < len)
return 0;
memcpy (cc_data, gst_byte_reader_get_data_unchecked (&br, len), len);
}
*out_fps_entry = fps_entry;
/* skip everything else we don't care about */
return len;
}
static gboolean
copy_from_stored_data (GstCCConverter * self, guint8 * out_ccp,
guint * ccp_size, guint8 * cea608_1, guint * cea608_1_len,
guint8 * cea608_2, guint * cea608_2_len)
{
guint ccp_in_size = 0, cea608_1_in_size = 0, cea608_2_in_size = 0;
g_assert ((out_ccp && ccp_size) || (!out_ccp && !ccp_size));
g_assert ((cea608_1 && cea608_1_len) || (!cea608_1 && !cea608_1_len));
g_assert ((cea608_2 && cea608_2_len) || (!cea608_2 && !cea608_2_len));
if (ccp_size) {
ccp_in_size = *ccp_size;
*ccp_size = 0;
}
if (cea608_1_len) {
cea608_1_in_size = *cea608_1_len;
*cea608_1_len = 0;
}
if (cea608_2_len) {
cea608_2_in_size = *cea608_2_len;
*cea608_2_len = 0;
}
if (out_ccp && self->scratch_ccp_len > 0) {
GST_DEBUG_OBJECT (self, "copying from previous scratch ccp buffer of "
"%u bytes", self->scratch_ccp_len);
if (ccp_in_size < *ccp_size + self->scratch_ccp_len) {
GST_WARNING_OBJECT (self, "output buffer too small %u < %u", ccp_in_size,
*ccp_size + self->scratch_ccp_len);
goto fail;
}
memcpy (&out_ccp[*ccp_size], self->scratch_ccp, self->scratch_ccp_len);
*ccp_size += self->scratch_ccp_len;
}
if (cea608_1 && self->scratch_cea608_1_len > 0) {
GST_DEBUG_OBJECT (self, "copying from previous scratch cea608 field 1 "
"buffer of %u bytes", self->scratch_cea608_1_len);
if (cea608_1_in_size < *cea608_1_len + self->scratch_cea608_1_len) {
GST_WARNING_OBJECT (self, "output buffer too small %u < %u",
cea608_1_in_size, *cea608_1_len + self->scratch_cea608_1_len);
goto fail;
}
memcpy (&cea608_1[*cea608_1_len], self->scratch_cea608_1,
self->scratch_cea608_1_len);
*cea608_1_len += self->scratch_cea608_1_len;
}
if (cea608_2 && self->scratch_cea608_2_len > 0) {
GST_DEBUG_OBJECT (self, "copying from previous scratch cea608 field 2 "
"buffer of %u bytes", self->scratch_cea608_2_len);
if (cea608_2_in_size < *cea608_2_len + self->scratch_cea608_2_len) {
GST_WARNING_OBJECT (self, "output buffer too small %u < %u",
cea608_2_in_size, *cea608_2_len + self->scratch_cea608_2_len);
goto fail;
}
memcpy (&cea608_2[*cea608_2_len], self->scratch_cea608_2,
self->scratch_cea608_2_len);
*cea608_2_len += self->scratch_cea608_2_len;
}
return TRUE;
fail:
if (ccp_size)
*ccp_size = 0;
if (cea608_1_len)
*cea608_1_len = 0;
if (cea608_2_len)
*cea608_2_len = 0;
return FALSE;
}
static gboolean
cc_data_to_cea608_ccp (GstCCConverter * self, guint8 * cc_data,
guint cc_data_len, guint8 * out_ccp, guint * ccp_size, guint8 * cea608_1,
guint * cea608_1_len, guint8 * cea608_2, guint * cea608_2_len,
const struct cdp_fps_entry *in_fps_entry)
{
guint ccp_in_size = 0, cea608_1_in_size = 0, cea608_2_in_size = 0;
g_assert (cc_data || cc_data_len == 0);
if (ccp_size)
ccp_in_size = *ccp_size;
if (cea608_1_len)
cea608_1_in_size = *cea608_1_len;
if (cea608_2_len)
cea608_2_in_size = *cea608_2_len;
if (!copy_from_stored_data (self, out_ccp, ccp_size, cea608_1, cea608_1_len,
cea608_2, cea608_2_len))
goto fail;
if (cc_data) {
gint ccp_offset = 0;
guint new_cea608_1_len = 0, new_cea608_2_len = 0;
guint8 *new_cea608_1 = cea608_1, *new_cea608_2 = cea608_2;
if (cea608_1_len) {
new_cea608_1_len = cea608_1_in_size - *cea608_1_len;
new_cea608_1 = &cea608_1[*cea608_1_len];
}
if (cea608_2_len) {
new_cea608_2_len = cea608_2_in_size - *cea608_2_len;
new_cea608_2 = &cea608_2[*cea608_2_len];
}
cc_data_len = compact_cc_data (cc_data, cc_data_len);
if (cc_data_len / 3 > in_fps_entry->max_cc_count) {
GST_WARNING_OBJECT (self, "Too many cc_data triples in CDP packet %u. "
"Truncating to %u", cc_data_len / 3, in_fps_entry->max_cc_count);
cc_data_len = 3 * in_fps_entry->max_cc_count;
}
ccp_offset = cc_data_extract_cea608 (cc_data, cc_data_len, new_cea608_1,
&new_cea608_1_len, new_cea608_2, &new_cea608_2_len);
if (ccp_offset < 0) {
GST_WARNING_OBJECT (self, "Failed to extract cea608 from cc_data");
goto fail;
}
if ((new_cea608_1_len + new_cea608_2_len) / 2 >
in_fps_entry->max_cea608_count) {
GST_WARNING_OBJECT (self, "Too many cea608 triples in CDP packet %u. "
"Truncating to %u", (new_cea608_1_len + new_cea608_2_len) / 2,
in_fps_entry->max_cea608_count);
if ((new_cea608_1_len + new_cea608_2_len) / 2 >
in_fps_entry->max_cea608_count) {
new_cea608_1_len = 2 * in_fps_entry->max_cea608_count;
new_cea608_2_len = 0;
} else {
new_cea608_2_len =
2 * in_fps_entry->max_cea608_count - new_cea608_1_len;
}
}
if (cea608_1_len)
*cea608_1_len += new_cea608_1_len;
if (cea608_2_len)
*cea608_2_len += new_cea608_2_len;
if (out_ccp) {
if (ccp_in_size < *ccp_size + cc_data_len - ccp_offset) {
GST_WARNING_OBJECT (self, "output buffer too small %u < %u",
ccp_in_size, *ccp_size + cc_data_len - ccp_offset);
goto fail;
}
memcpy (&out_ccp[*ccp_size], &cc_data[ccp_offset],
cc_data_len - ccp_offset);
*ccp_size += cc_data_len - ccp_offset;
}
}
return TRUE;
fail:
if (ccp_size)
*ccp_size = 0;
if (cea608_1_len)
*cea608_1_len = 0;
if (cea608_2_len)
*cea608_2_len = 0;
return FALSE;
}
static gboolean
cdp_to_cea608_cc_data (GstCCConverter * self, GstBuffer * inbuf,
guint8 * out_ccp, guint * ccp_size, guint8 * cea608_1, guint * cea608_1_len,
guint8 * cea608_2, guint * cea608_2_len, 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_cea708_cc_data_internal (self, in.data, in.size,
cc_data, out_tc, in_fps_entry);
gst_buffer_unmap (inbuf, &in);
self->input_frames++;
}
return cc_data_to_cea608_ccp (self, inbuf ? cc_data : NULL, cc_data_len,
out_ccp, ccp_size, cea608_1, cea608_1_len, cea608_2, cea608_2_len,
inbuf ? *in_fps_entry : NULL);
}
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 have to assume that each value is from the first field and
* don't know from which line offset it originally is */
for (i = 0; i < n; i++) {
out.data[i * 3] = 0x80;
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_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 have to assume that each value is from the first field and
* don't know from which line offset it originally is */
for (i = 0; i < n; i++) {
out.data[i * 3] = 0xfc;
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)
{
GstMapInfo in, out;
const GstVideoTimeCodeMeta *tc_meta;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint cea608_1_len = MAX_CDP_PACKET_LEN;
guint8 cc_data[MAX_CDP_PACKET_LEN], cea608_1[MAX_CEA608_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 (!copy_from_stored_data (self, NULL, 0, cea608_1, &cea608_1_len, NULL, 0))
goto drop;
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);
memcpy (&cea608_1[cea608_1_len], in.data, n * 2);
gst_buffer_unmap (inbuf, &in);
cea608_1_len += n * 2;
self->input_frames++;
tc_meta = gst_buffer_get_video_time_code_meta (inbuf);
} else {
tc_meta = NULL;
}
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 (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, NULL, 0,
cea608_1, &cea608_1_len, NULL, 0, tc_meta ? &tc_meta->tc : NULL))
goto drop;
if (!combine_cc_data (self, TRUE, out_fps_entry, NULL, 0, cea608_1,
cea608_1_len, NULL, 0, cc_data, &cc_data_len))
goto drop;
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) {
out.data[i * 2] = in.data[i * 3 + 1];
out.data[i * 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)
{
GstMapInfo in, out;
const GstVideoTimeCodeMeta *tc_meta;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint cc_data_len = MAX_CDP_PACKET_LEN;
guint cea608_1_len = MAX_CDP_PACKET_LEN, cea608_2_len = MAX_CDP_PACKET_LEN;
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 (!copy_from_stored_data (self, NULL, 0, cea608_1, &cea608_1_len,
cea608_2, &cea608_2_len))
goto drop;
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++) {
if (in.data[i * 3] & 0x80) {
cea608_1[cea608_1_len++] = in.data[i * 3 + 1];
cea608_1[cea608_1_len++] = in.data[i * 3 + 2];
} else {
cea608_2[cea608_2_len++] = in.data[i * 3 + 1];
cea608_2[cea608_2_len++] = in.data[i * 3 + 2];
}
}
gst_buffer_unmap (inbuf, &in);
self->input_frames++;
tc_meta = gst_buffer_get_video_time_code_meta (inbuf);
} else {
tc_meta = NULL;
}
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 (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, NULL, 0,
cea608_1, &cea608_1_len, cea608_2, &cea608_2_len,
tc_meta ? &tc_meta->tc : NULL)) {
goto drop;
}
if (!combine_cc_data (self, TRUE, out_fps_entry, NULL, 0, cea608_1,
cea608_1_len, cea608_2, cea608_2_len, cc_data, &cc_data_len)) {
goto drop;
}
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++) {
/* We can only really copy the first field here as there can't be any
* signalling in raw CEA608 and we must not mix the streams of different
* fields
*/
if (in.data[i * 3] == 0xfc) {
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)
{
GstMapInfo in, out;
const GstVideoTimeCodeMeta *tc_meta;
const struct cdp_fps_entry *in_fps_entry, *out_fps_entry;
guint in_cc_data_len;
guint cc_data_len = MAX_CDP_PACKET_LEN, ccp_data_len = MAX_CDP_PACKET_LEN;
guint cea608_1_len = MAX_CEA608_LEN, cea608_2_len = MAX_CEA608_LEN;
guint8 cc_data[MAX_CDP_PACKET_LEN], ccp_data[MAX_CDP_PACKET_LEN];
guint8 cea608_1[MAX_CEA608_LEN], cea608_2[MAX_CEA608_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;
tc_meta = gst_buffer_get_video_time_code_meta (inbuf);
self->input_frames++;
} else {
in_cc_data = NULL;
in_cc_data_len = 0;
tc_meta = NULL;
}
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 ();
if (!cc_data_to_cea608_ccp (self, in_cc_data, in_cc_data_len, ccp_data,
&ccp_data_len, cea608_1, &cea608_1_len, cea608_2, &cea608_2_len,
in_fps_entry)) {
if (inbuf)
gst_buffer_unmap (inbuf, &in);
goto drop;
}
if (inbuf)
gst_buffer_unmap (inbuf, &in);
if (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, ccp_data,
&ccp_data_len, cea608_1, &cea608_1_len, cea608_2, &cea608_2_len,
tc_meta ? &tc_meta->tc : NULL))
goto drop;
if (!combine_cc_data (self, TRUE, out_fps_entry, ccp_data, ccp_data_len,
cea608_1, cea608_1_len, cea608_2, cea608_2_len, cc_data,
&cc_data_len))
goto drop;
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)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
guint cea608_1_len;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
cea608_1_len = (guint) out.size;
if (!cdp_to_cea608_cc_data (self, inbuf, NULL, NULL, out.data, &cea608_1_len,
NULL, NULL, &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 (fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, NULL, 0,
out.data, &cea608_1_len, NULL, NULL, &tc)) {
self->output_frames++;
} else {
cea608_1_len = 0;
}
gst_buffer_unmap (outbuf, &out);
gst_buffer_set_size (outbuf, cea608_1_len);
if (self->current_output_timecode.config.fps_n != 0
&& !gst_buffer_get_video_time_code_meta (inbuf)) {
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;
}
static GstFlowReturn
convert_cea708_cdp_cea608_s334_1a (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 cea608_1[MAX_CEA608_LEN], cea608_2[MAX_CEA608_LEN];
guint cea608_1_len = MAX_CEA608_LEN, cea608_2_len = MAX_CEA608_LEN;
guint i, cc_data_len;
if (!cdp_to_cea608_cc_data (self, inbuf, NULL, NULL, cea608_1, &cea608_1_len,
cea608_2, &cea608_2_len, &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 (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, NULL, 0,
cea608_1, &cea608_1_len, cea608_2, &cea608_2_len, &tc))
goto drop;
cc_data_len = gst_buffer_get_sizes (outbuf, NULL, NULL);
gst_buffer_map (outbuf, &out, GST_MAP_READWRITE);
if (!combine_cc_data (self, FALSE, out_fps_entry, NULL, 0, cea608_1,
cea608_1_len, cea608_2, cea608_2_len, out.data, &cc_data_len)) {
gst_buffer_unmap (outbuf, &out);
goto drop;
}
for (i = 0; i < cc_data_len / 3; i++)
/* We have to assume a line offset of 0 */
out.data[i * 3] = out.data[i * 3] == 0xfc ? 0x80 : 0x00;
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
gst_buffer_set_size (outbuf, cc_data_len);
if (self->current_output_timecode.config.fps_n != 0
&& !gst_buffer_get_video_time_code_meta (inbuf)) {
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)
{
GstMapInfo out;
GstVideoTimeCode tc = GST_VIDEO_TIME_CODE_INIT;
const struct cdp_fps_entry *in_fps_entry = NULL, *out_fps_entry;
guint8 cea608_1[MAX_CEA608_LEN], cea608_2[MAX_CEA608_LEN];
guint8 ccp_data[MAX_CDP_PACKET_LEN];
guint cea608_1_len = MAX_CEA608_LEN, cea608_2_len = MAX_CEA608_LEN;
guint ccp_data_len = MAX_CDP_PACKET_LEN;
guint out_len = 0;
if (!cdp_to_cea608_cc_data (self, inbuf, ccp_data, &ccp_data_len,
cea608_1, &cea608_1_len, cea608_2, &cea608_2_len, &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 (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, ccp_data,
&ccp_data_len, cea608_1, &cea608_1_len, cea608_2, &cea608_2_len, &tc))
goto out;
gst_buffer_map (outbuf, &out, GST_MAP_WRITE);
out_len = (guint) out.size;
if (!combine_cc_data (self, FALSE, out_fps_entry, ccp_data, ccp_data_len,
cea608_1, cea608_1_len, cea608_2, cea608_2_len, out.data, &out_len)) {
gst_buffer_unmap (outbuf, &out);
out_len = 0;
goto out;
}
gst_buffer_unmap (outbuf, &out);
self->output_frames++;
if (self->current_output_timecode.config.fps_n != 0
&& !gst_buffer_get_video_time_code_meta (inbuf)) {
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 cea608_1[MAX_CEA608_LEN], cea608_2[MAX_CEA608_LEN];
guint8 ccp_data[MAX_CDP_PACKET_LEN], cc_data[MAX_CDP_PACKET_LEN];
guint cea608_1_len = MAX_CEA608_LEN, cea608_2_len = MAX_CEA608_LEN;
guint ccp_data_len = MAX_CDP_PACKET_LEN, cc_data_len = MAX_CDP_PACKET_LEN;
guint out_len = 0;
if (!cdp_to_cea608_cc_data (self, inbuf, ccp_data, &ccp_data_len,
cea608_1, &cea608_1_len, cea608_2, &cea608_2_len, &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 (!fit_and_scale_cc_data (self, in_fps_entry, out_fps_entry, ccp_data,
&ccp_data_len, cea608_1, &cea608_1_len, cea608_2, &cea608_2_len, &tc))
goto out;
if (!combine_cc_data (self, TRUE, out_fps_entry, ccp_data, ccp_data_len,
cea608_1, cea608_1_len, cea608_2, cea608_2_len, cc_data,
&cc_data_len)) {
goto out;
}
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);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:
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);
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);
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);
break;
case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:
ret = convert_cea708_cdp_cea608_s334_1a (self, inbuf, outbuf);
break;
case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:
ret = convert_cea708_cdp_cea708_cc_data (self, inbuf, outbuf);
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 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->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)
{
GstBaseTransformClass *bclass = GST_BASE_TRANSFORM_GET_CLASS (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;
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);
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;
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;
self->input_frames = 0;
self->output_frames = 1;
self->scratch_ccp_len = 0;
self->scratch_cea608_1_len = 0;
self->scratch_cea608_2_len = 0;
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_class_init (GstCCConverterClass * klass)
{
GstElementClass *gstelement_class;
GstBaseTransformClass *basetransform_class;
gstelement_class = (GstElementClass *) klass;
basetransform_class = (GstBaseTransformClass *) klass;
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");
}
static void
gst_cc_converter_init (GstCCConverter * self)
{
}
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