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IMAGE: Honor nb_fields when calculating frame duration

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From what I understand, this has something to do with the image
being either made up from two or three parts. When it's made from
three parts, the frame should be displayed for half again as long
as normal.

This makes the speed of the Zork: Grand Inquisitor video look
about right to me. It's still out of sync, but it doesn't seem to
get *more* out of sync as the video progresses.
This commit is contained in:
Torbjörn Andersson 2018-05-29 19:56:55 +02:00 committed by Thierry Crozat
parent 43b29a93d7
commit d4f8b330d6
1 changed files with 5 additions and 0 deletions
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5
image/codecs/mpeg.cpp
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@ -78,8 +78,13 @@ bool MPEGDecoder::decodePacket(Common::SeekableReadStream &packet, uint32 &frame
if (_mpegInfo->display_fbuf) {
foundFrame = true;
const mpeg2_sequence_t *sequence = _mpegInfo->sequence;
const mpeg2_picture_t *picture = _mpegInfo->display_picture;
framePeriod += sequence->frame_period;
if (picture->nb_fields > 2) {
framePeriod += (sequence->frame_period / 2);
}
if (!dst) {
// If no destination is specified, use our internal storage