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avcodec/msmpeg4dec: Don't check for errors for complete VLCs 

This also affected other users of VLCs from msmpeg4dec, namely vc1_block
and wmv2dec.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2021-01-26 01:14:45 +01:00
parent a899d6ca10
commit fbb81ea2c6
4 changed files with 6 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavcodec/msmpeg4.h
View File

@ -59,7 +59,7 @@ void ff_msmpeg4_encode_mb(MpegEncContext *s, int16_t block[6][64],
int ff_msmpeg4_decode_init(AVCodecContext *avctx);
int ff_msmpeg4_decode_picture_header(MpegEncContext *s);
int ff_msmpeg4_decode_ext_header(MpegEncContext *s, int buf_size);
int ff_msmpeg4_decode_motion(MpegEncContext * s, int *mx_ptr, int *my_ptr);
void ff_msmpeg4_decode_motion(MpegEncContext * s, int *mx_ptr, int *my_ptr);
int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
int n, int coded, const uint8_t *scan_table);
int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,

20
libavcodec/msmpeg4dec.c
View File

@ -228,8 +228,6 @@ static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
}
code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX].table, MB_NON_INTRA_VLC_BITS, 3);
if (code < 0)
return -1;
//s->mb_intra = (code & 0x40) ? 0 : 1;
s->mb_intra = (~code & 0x40) >> 6;
@ -237,8 +235,6 @@ static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
} else {
s->mb_intra = 1;
code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
if (code < 0)
return -1;
/* predict coded block pattern */
cbp = 0;
for(i=0;i<6;i++) {
@ -259,8 +255,7 @@ static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
s->rl_chroma_table_index = s->rl_table_index;
}
ff_h263_pred_motion(s, 0, 0, &mx, &my);
if (ff_msmpeg4_decode_motion(s, &mx, &my) < 0)
return -1;
ff_msmpeg4_decode_motion(s, &mx, &my);
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
s->mv[0][0][0] = mx;
@ -612,11 +607,6 @@ static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
} else {
level = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
}
if (level < 0){
av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
*dir_ptr = 0;
return -1;
}
if (level == DC_MAX) {
level = get_bits(&s->gb, 8);
@ -838,8 +828,7 @@ int ff_msmpeg4_decode_block(MpegEncContext * s, int16_t * block,
return 0;
}
int ff_msmpeg4_decode_motion(MpegEncContext * s,
int *mx_ptr, int *my_ptr)
void ff_msmpeg4_decode_motion(MpegEncContext *s, int *mx_ptr, int *my_ptr)
{
MVTable *mv;
int code, mx, my;
@ -847,10 +836,6 @@ int ff_msmpeg4_decode_motion(MpegEncContext * s,
mv = &ff_mv_tables[s->mv_table_index];
code = get_vlc2(&s->gb, mv->vlc.table, MV_VLC_BITS, 2);
if (code < 0){
av_log(s->avctx, AV_LOG_ERROR, "illegal MV code at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
if (code == mv->n) {
mx = get_bits(&s->gb, 6);
my = get_bits(&s->gb, 6);
@ -873,7 +858,6 @@ int ff_msmpeg4_decode_motion(MpegEncContext * s,
my -= 64;
*mx_ptr = mx;
*my_ptr = my;
return 0;
}
AVCodec ff_msmpeg4v1_decoder = {

12
libavcodec/vc1_block.c
View File

@ -592,10 +592,6 @@ static int vc1_decode_i_block(VC1Context *v, int16_t block[64], int n,
} else {
dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
}
if (dcdiff < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
return -1;
}
if (dcdiff) {
const int m = (v->pq == 1 || v->pq == 2) ? 3 - v->pq : 0;
if (dcdiff == 119 /* ESC index value */) {
@ -740,10 +736,6 @@ static int vc1_decode_i_block_adv(VC1Context *v, int16_t block[64], int n,
} else {
dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
}
if (dcdiff < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
return -1;
}
if (dcdiff) {
const int m = (quant == 1 || quant == 2) ? 3 - quant : 0;
if (dcdiff == 119 /* ESC index value */) {
@ -944,10 +936,6 @@ static int vc1_decode_intra_block(VC1Context *v, int16_t block[64], int n,
} else {
dcdiff = get_vlc2(&s->gb, ff_msmp4_dc_chroma_vlc[s->dc_table_index].table, DC_VLC_BITS, 3);
}
if (dcdiff < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Illegal DC VLC\n");
return -1;
}
if (dcdiff) {
const int m = (quant == 1 || quant == 2) ? 3 - quant : 0;
if (dcdiff == 119 /* ESC index value */) {

20
libavcodec/wmv2dec.c
View File

@ -278,22 +278,16 @@ int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
return 0;
}
static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
static inline void wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
{
MpegEncContext *const s = &w->s;
int ret;
ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
if (ret < 0)
return ret;
ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
w->hshift = get_bits1(&s->gb);
else
w->hshift = 0;
return 0;
}
static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
@ -409,8 +403,6 @@ int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
MB_NON_INTRA_VLC_BITS, 3);
if (code < 0)
return AVERROR_INVALIDDATA;
s->mb_intra = (~code & 0x40) >> 6;
cbp = code & 0x3f;
@ -419,11 +411,6 @@ int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
if (get_bits_left(&s->gb) <= 0)
return AVERROR_INVALIDDATA;
code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
if (code < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
/* predict coded block pattern */
cbp = 0;
for (i = 0; i < 6; i++) {
@ -456,8 +443,7 @@ int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
w->per_block_abt = 0;
}
if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0)
return ret;
wmv2_decode_motion(w, &mx, &my);
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;