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RV20: try keeping aspect during resolution changes.

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Resolution changes are usually only used to scale with
network bandwidth, the (full) resolution specified in the
RM header really is authoritative.
While I am not sure this is the best solution, it is a
conservative approach that still should fix the most
common cases.
In particular, it fixes aspect with the sample from trac
issue #785 (in MPlayer, ffplay seems to just ignore
sample aspect changes in mid-playback).

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Reimar Döffinger 2012-04-09 14:21:01 +02:00
parent 1d130328ed
commit 438f3ef821
1 changed files with 9 additions and 0 deletions
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9
libavcodec/rv10.c
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@ -371,10 +371,19 @@ static int rv20_decode_picture_header(RVDecContext *rv)
new_h= s->orig_height;
}
if(new_w != s->width || new_h != s->height){
AVRational old_aspect = s->avctx->sample_aspect_ratio;
av_log(s->avctx, AV_LOG_DEBUG, "attempting to change resolution to %dx%d\n", new_w, new_h);
if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
return -1;
ff_MPV_common_end(s);
// attempt to keep aspect during typical resolution switches
if (!old_aspect.num)
old_aspect = (AVRational){1, 1};
if (2 * new_w * s->height == new_h * s->width)
s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
if (new_w * s->height == 2 * new_h * s->width)
s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
avcodec_set_dimensions(s->avctx, new_w, new_h);
s->width = new_w;
s->height = new_h;