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ccconverter: refactor cdp id, fps, max_cc_count into a table

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1116>
This commit is contained in:
Matthew Waters 2020-03-12 12:54:41 +11:00 committed by GStreamer Merge Bot
parent afc120fa74
commit b25d75f201
1 changed files with 52 additions and 64 deletions
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116
ext/closedcaption/gstccconverter.c
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@ -443,6 +443,46 @@ invalid_caps:
}
}
struct cdp_fps_entry
{
guint8 fps_idx;
guint fps_n, fps_d;
guint max_cc_count;
};
static const struct cdp_fps_entry cdp_fps_table[] = {
{0x1f, 24000, 1001, 25},
{0x2f, 24, 1, 25},
{0x3f, 25, 1, 24},
{0x4f, 30000, 1001, 20},
{0x5f, 30, 1, 20},
{0x6f, 50, 1, 12},
{0x7f, 60000, 1001, 10},
{0x8f, 60, 1, 10},
};
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;
}
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;
}
/* Converts raw CEA708 cc_data and an optional timecode into CDP */
static guint
convert_cea708_cc_data_cea708_cdp_internal (GstCCConverter * self,
@ -453,38 +493,19 @@ convert_cea708_cc_data_cea708_cdp_internal (GstCCConverter * self,
guint8 flags, checksum;
guint i, len;
guint cc_count;
const struct cdp_fps_entry *fps_entry;
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);
if (self->fps_n == 24000 && self->fps_d == 1001) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x1f);
cc_count = 25;
} else if (self->fps_n == 24 && self->fps_d == 1) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x2f);
cc_count = 25;
} else if (self->fps_n == 25 && self->fps_d == 1) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x3f);
cc_count = 24;
} else if (self->fps_n == 30000 && self->fps_d == 1001) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x4f);
cc_count = 20;
} else if (self->fps_n == 30 && self->fps_d == 1) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x5f);
cc_count = 20;
} else if (self->fps_n == 50 && self->fps_d == 1) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x6f);
cc_count = 12;
} else if (self->fps_n == 60000 && self->fps_d == 1001) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x7f);
cc_count = 10;
} else if (self->fps_n == 60 && self->fps_d == 1) {
gst_byte_writer_put_uint8_unchecked (&bw, 0x8f);
cc_count = 10;
} else {
fps_entry = cdp_fps_entry_from_fps (self->fps_n, self->fps_d);
if (!fps_entry)
g_assert_not_reached ();
}
cc_count = fps_entry->max_cc_count;
gst_byte_writer_put_uint8_unchecked (&bw, fps_entry->fps_idx);
if (cc_data_len / 3 > cc_count) {
GST_WARNING_OBJECT (self, "Too many cc_data triplet for framerate: %u > %u",
@ -571,8 +592,8 @@ convert_cea708_cdp_cea708_cc_data_internal (GstCCConverter * self,
guint16 u16;
guint8 u8;
guint8 flags;
gint fps_n, fps_d;
guint len = 0;
const struct cdp_fps_entry *fps_entry;
memset (tc, 0, sizeof (*tc));
@ -590,42 +611,9 @@ convert_cea708_cdp_cea708_cc_data_internal (GstCCConverter * self,
return 0;
u8 = gst_byte_reader_get_uint8_unchecked (&br);
switch (u8) {
case 0x1f:
fps_n = 24000;
fps_d = 1001;
break;
case 0x2f:
fps_n = 24;
fps_d = 1;
break;
case 0x3f:
fps_n = 25;
fps_d = 1;
break;
case 0x4f:
fps_n = 30000;
fps_d = 1001;
break;
case 0x5f:
fps_n = 30;
fps_d = 1;
break;
case 0x6f:
fps_n = 50;
fps_d = 1;
break;
case 0x7f:
fps_n = 60000;
fps_d = 1001;
break;
case 0x8f:
fps_n = 60;
fps_d = 1;
break;
default:
return 0;
}
fps_entry = cdp_fps_entry_from_id (u8);
if (!fps_entry)
return 0;
flags = gst_byte_reader_get_uint8_unchecked (&br);
/* No cc_data? */
@ -670,7 +658,7 @@ convert_cea708_cdp_cea708_cc_data_internal (GstCCConverter * self,
drop_frame = ! !(u8 & 0x80);
frames = ((u8 >> 4) & 0x3) * 10 + (u8 & 0xf);
gst_video_time_code_init (tc, fps_n, fps_d, NULL,
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);