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dvbsubenc: Fix bottom field size calculation

Browse source 
Don't accidentally include the stuffing byte (if present)
into the bottom field size. It should only be included in the
total segment length.

Fixes problems with FFmpeg not rendering the subtitles
with a stuffing byte, giving a "Invalid object location!" error.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6250>
This commit is contained in:
Jan Schmidt 2024-03-01 21:00:33 +11:00 committed by GStreamer Marge Bot
parent ca0d4dd6cc
commit 4b107b60e7
1 changed files with 7 additions and 5 deletions
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12
subprojects/gst-plugins-bad/gst/dvbsubenc/gstdvbsubenc-util.c
View file

@ -551,7 +551,7 @@ static gboolean
dvbenc_write_object_data (GstByteWriter * b, int object_version, int page_id,
int object_id, SubpictureRect * s)
{
guint seg_size_pos, end_pos;
guint seg_size_pos, end_pos, bottom_end_pos;
guint pixel_fields_size_pos, top_start_pos, bottom_start_pos;
EncodeRLEFunc encode_rle_func;
const gint stride = GST_VIDEO_INFO_PLANE_STRIDE (&s->frame->info, 0);
@ -588,13 +588,15 @@ dvbenc_write_object_data (GstByteWriter * b, int object_version, int page_id,
if (h > 1)
encode_rle_func (b, pixels + stride, stride * 2, w, h >> 1);
end_pos = gst_byte_writer_get_pos (b);
bottom_end_pos = gst_byte_writer_get_pos (b);
/* If the encoded size of the top+bottom field data blocks is even,
* add a stuffing byte */
if (((end_pos - top_start_pos) & 1) == 0) {
if (((bottom_end_pos - top_start_pos) & 1) == 0) {
gst_byte_writer_put_uint8 (b, 0);
end_pos = gst_byte_writer_get_pos (b);
} else {
end_pos = bottom_end_pos;
}
/* Re-write the size fields */
@ -605,12 +607,12 @@ dvbenc_write_object_data (GstByteWriter * b, int object_version, int page_id,
if (bottom_start_pos - top_start_pos > G_MAXUINT16)
return FALSE; /* Data too big */
if (end_pos - bottom_start_pos > G_MAXUINT16)
if (bottom_end_pos - bottom_start_pos > G_MAXUINT16)
return FALSE; /* Data too big */
gst_byte_writer_set_pos (b, pixel_fields_size_pos);
gst_byte_writer_put_uint16_be (b, bottom_start_pos - top_start_pos);
gst_byte_writer_put_uint16_be (b, end_pos - bottom_start_pos);
gst_byte_writer_put_uint16_be (b, bottom_end_pos - bottom_start_pos);
gst_byte_writer_set_pos (b, end_pos);
GST_LOG ("Object seg size %u top_size %u bottom_size %u",