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jpegdec: be stricter when detecting interlaced video

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There are broken(?) mjpeg videos that are incorrectly detected as
interlaced. This happens because 'info.height > height' (e.g. 1088 > 1080).

In the interlaced case info.height is approximately 'height * 2' but not
exactly because height is a multiple of DCTSIZE. Make the check more
restrictive but take the rounding effect into account.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4717>
This commit is contained in:
Michael Olbrich 2020-08-31 16:38:48 +02:00 committed by Tim-Philipp Müller
parent b4330c730b
commit c83f24b038
1 changed files with 2 additions and 2 deletions
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4
subprojects/gst-plugins-good/ext/jpeg/gstjpegdec.c
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@ -1406,8 +1406,8 @@ gst_jpeg_dec_handle_frame (GstVideoDecoder * bdec, GstVideoCodecFrame * frame)
/* is it interlaced MJPEG? (we really don't want to scan the jpeg data
* to see if there are two SOF markers in the packet to detect this) */
if (gst_video_decoder_get_packetized (bdec) &&
dec->input_state &&
dec->input_state->info.height > height &&
dec->input_state && height > DCTSIZE &&
dec->input_state->info.height > (2 * (height - DCTSIZE)) &&
dec->input_state->info.height <= (height * 2)
&& dec->input_state->info.width == width) {
GST_LOG_OBJECT (dec,