diff options
| author | Jerome Borsboom <jerome.borsboom@carpalis.nl> | 2019-01-12 16:14:00 +0100 |
|---|---|---|
| committer | Carl Eugen Hoyos <ceffmpeg@gmail.com> | 2019-01-12 16:40:07 +0100 |
| commit | b6402278322d1f64810cac4bea26d34d7b9a2e6a (patch) | |
| tree | 1e72687c6e649c2d1ba4caa986cb3fbc16f2471d | |
| parent | 96740ec69f272ad2364175656590a908b9e98a6c (diff) | |
avcodec/vc1: fix decoding of old WMV3 format
The position of the second MV predicitor candidate is slightly different
for the old WMV3 format indicated by RES_RTM_FLAG. This patch fixes
decoding of niceday.wmv on the samples server.
Fixes: #6641
Signed-off-by: Jerome Borsboom <jerome.borsboom@carpalis.nl>
| -rw-r--r-- | libavcodec/vc1.c | 5 | ||||
| -rw-r--r-- | libavcodec/vc1_pred.c | 5 |
2 files changed, 4 insertions, 6 deletions
diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c index 3581d87b57..e102b931d8 100644 --- a/libavcodec/vc1.c +++ b/libavcodec/vc1.c @@ -379,11 +379,6 @@ int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitCo } else { v->res_rtm_flag = get_bits1(gb); //reserved } - if (!v->res_rtm_flag) { - av_log(avctx, AV_LOG_ERROR, - "Old WMV3 version detected, some frames may be decoded incorrectly\n"); - //return -1; - } //TODO: figure out what they mean (always 0x402F) if (!v->res_fasttx) skip_bits(gb, 16); diff --git a/libavcodec/vc1_pred.c b/libavcodec/vc1_pred.c index 75225d2023..8b5a9ead0b 100644 --- a/libavcodec/vc1_pred.c +++ b/libavcodec/vc1_pred.c @@ -275,7 +275,10 @@ void ff_vc1_pred_mv(VC1Context *v, int n, int dmv_x, int dmv_y, //in 4-MV mode different blocks have different B predictor position switch (n) { case 0: - off = (s->mb_x > 0) ? -1 : 1; + if (v->res_rtm_flag) + off = s->mb_x ? -1 : 1; + else + off = s->mb_x ? -1 : 2 * s->mb_width - wrap - 1; break; case 1: off = (s->mb_x == (s->mb_width - 1)) ? -1 : 1; |