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| author | Mans Rullgard <mans@mansr.com> | 2011-10-09 23:16:07 +0100 |
|---|---|---|
| committer | Mans Rullgard <mans@mansr.com> | 2011-10-09 23:22:14 +0100 |
| commit | aa498fef0dbd6eebd1b4dd90c36d3117cd9a17b2 (patch) | |
| tree | 03193ac1cacab49690ac6734dbecfbb76384e780 | |
| parent | 633ddb85192f1cc39d61fae98455eb6ae5638df0 (diff) | |
| download | ffmpeg-aa498fef0dbd6eebd1b4dd90c36d3117cd9a17b2.tar.gz | |
mpeg124: use sign_extend() function
Signed-off-by: Mans Rullgard <mans@mansr.com>
| -rw-r--r-- | libavcodec/ituh263dec.c | 5 | ||||
| -rw-r--r-- | libavcodec/ituh263enc.c | 5 | ||||
| -rw-r--r-- | libavcodec/mpeg12.c | 6 |
3 files changed, 6 insertions, 10 deletions
diff --git a/libavcodec/ituh263dec.c b/libavcodec/ituh263dec.c index a54d7c1728..a234c2ac7a 100644 --- a/libavcodec/ituh263dec.c +++ b/libavcodec/ituh263dec.c @@ -271,7 +271,7 @@ int ff_h263_resync(MpegEncContext *s){ int h263_decode_motion(MpegEncContext * s, int pred, int f_code) { - int code, val, sign, shift, l; + int code, val, sign, shift; code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); if (code == 0) @@ -293,8 +293,7 @@ int h263_decode_motion(MpegEncContext * s, int pred, int f_code) /* modulo decoding */ if (!s->h263_long_vectors) { - l = INT_BIT - 5 - f_code; - val = (val<<l)>>l; + val = sign_extend(val, 5 + f_code); } else { /* horrible h263 long vector mode */ if (pred < -31 && val < -63) diff --git a/libavcodec/ituh263enc.c b/libavcodec/ituh263enc.c index 383a81b0e1..783a04f64d 100644 --- a/libavcodec/ituh263enc.c +++ b/libavcodec/ituh263enc.c @@ -657,7 +657,7 @@ void h263_encode_mb(MpegEncContext * s, void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code) { - int range, l, bit_size, sign, code, bits; + int range, bit_size, sign, code, bits; if (val == 0) { /* zero vector */ @@ -667,8 +667,7 @@ void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code) bit_size = f_code - 1; range = 1 << bit_size; /* modulo encoding */ - l= INT_BIT - 6 - bit_size; - val = (val<<l)>>l; + val = sign_extend(val, 6 + bit_size); sign = val>>31; val= (val^sign)-sign; sign&=1; diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c index 6a12344139..5734ab8674 100644 --- a/libavcodec/mpeg12.c +++ b/libavcodec/mpeg12.c @@ -54,7 +54,7 @@ static VLC mv_vlc; /* as H.263, but only 17 codes */ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) { - int code, sign, val, l, shift; + int code, sign, val, shift; code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); if (code == 0) { @@ -77,9 +77,7 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) val += pred; /* modulo decoding */ - l = INT_BIT - 5 - shift; - val = (val << l) >> l; - return val; + return sign_extend(val, 5 + shift); } static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n) |