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j2kdec: random non functional changed from jpeg2000

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-05-28 01:31:07 +02:00
parent d66de3801e
commit 05fa3f6802
1 changed files with 40 additions and 24 deletions
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64
libavcodec/j2kdec.c
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@ -81,6 +81,10 @@ typedef struct Jpeg2000DecoderContext {
int reduction_factor;
} Jpeg2000DecoderContext;
/* get_bits functions for JPEG2000 packet bitstream
* It is a get_bit function with a bit-stuffing routine. If the value of the
* byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
* cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
static int get_bits(Jpeg2000DecoderContext *s, int n)
{
int res = 0;
@ -326,7 +330,7 @@ static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
compno = bytestream2_get_byteu(&s->g);
c += compno;
c->csty = bytestream2_get_byte(&s->g);
c->csty = bytestream2_get_byteu(&s->g);
get_cox(s, c);
properties[compno] |= HAD_COC;
@ -387,7 +391,7 @@ static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
return -1;
for (compno = 0; compno < s->ncomponents; compno++)
if (!(properties[compno] & HAD_QCC))
memcpy(q + compno, &tmp, sizeof(Jpeg2000QuantStyle));
memcpy(q + compno, &tmp, sizeof(tmp));
return 0;
}
@ -630,11 +634,15 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
if (reslevelno < codsty->nreslevels) {
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
reslevelno;
ok_reslevel = 1;
for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++) {
if (decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn +
(reslevelno ? 3*(reslevelno-1)+1 : 0), qntsty->nguardbits))
if (decode_packet(s,
codsty, rlevel,
precno, layno,
qntsty->expn + (reslevelno ? 3*(reslevelno-1)+1 : 0),
qntsty->nguardbits))
return -1;
}
}
@ -645,14 +653,15 @@ static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile
}
/* TIER-1 routines */
static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol,
static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
int bpno, int bandno, int bpass_csty_symbol,
int vert_causal_ctx_csty_symbol)
{
int mask = 3 << (bpno - 1), y0, x, y;
for (y0 = 0; y0 < height; y0 += 4)
for (x = 0; x < width; x++)
for (y = y0; y < height && y < y0+4; y++) {
for (y = y0; y < height && y < y0 + 4; y++) {
if ((t1->flags[y+1][x+1] & JPEG2000_T1_SIG_NB)
&& !(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
int flags_mask = -1;
@ -695,8 +704,9 @@ static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
}
}
static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1, int width, int height,
int bpno, int bandno, int seg_symbols, int vert_causal_ctx_csty_symbol)
static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
int width, int height, int bpno, int bandno,
int seg_symbols, int vert_causal_ctx_csty_symbol)
{
int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
@ -777,19 +787,22 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
while (passno--) {
switch(pass_t) {
case 0: decode_sigpass(t1, width, height, bpno+1, bandpos,
bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
break;
case 1: decode_refpass(t1, width, height, bpno+1);
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
codsty->cblk_style & JPEG2000_CBLK_SEGSYM, vert_causal_ctx_csty_symbol);
clnpass_cnt = clnpass_cnt + 1;
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
case 0:
decode_sigpass(t1, width, height, bpno+1, bandpos,
bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
break;
case 1:
decode_refpass(t1, width, height, bpno+1);
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
case 2:
decode_clnpass(s, t1, width, height, bpno+1, bandpos,
codsty->cblk_style & JPEG2000_CBLK_SEGSYM, vert_causal_ctx_csty_symbol);
clnpass_cnt = clnpass_cnt + 1;
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
}
pass_t++;
@ -1041,12 +1054,15 @@ static int decode_codestream(Jpeg2000DecoderContext *s)
ret = get_tlm(s, len);
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%x\n", marker, bytestream2_tell(&s->g) - 4);
av_log(s->avctx, AV_LOG_ERROR,
"unsupported marker 0x%.4X at pos 0x%x\n",
marker, bytestream2_tell(&s->g) - 4);
bytestream2_skip(&s->g, len - 2);
break;
}
if (bytestream2_tell(&s->g) - oldpos != len || ret) {
av_log(s->avctx, AV_LOG_ERROR, "error during processing marker segment %.4x\n", marker);
av_log(s->avctx, AV_LOG_ERROR,
"error during processing marker segment %.4x\n", marker);
return ret ? ret : -1;
}
}