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jpeg2000: Use EBCOT's CAUSAL and BYPASS mode in decode_cblk()

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Speed it up a bit.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Michael Niedermayer
2013-07-01 10:01:32 +02:00
committed by Luca Barbato
parent d57c737ac3
commit 64f6570c6e
1 changed files with 40 additions and 25 deletions
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65
libavcodec/jpeg2000dec.c
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@@ -828,32 +828,33 @@ 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 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++)
if ((t1->flags[y + 1][x + 1] & JPEG2000_T1_SIG_NB)
&& !(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
if (ff_mqc_decode(&t1->mqc,
t1->mqc.cx_states +
ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
bandno))) {
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
&xorbit);
t1->data[y][x] =
(ff_mqc_decode(&t1->mqc,
t1->mqc.cx_states + ctxno) ^ xorbit)
? -mask : mask;
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;
if (vert_causal_ctx_csty_symbol && y == y0 + 3)
flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE);
if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask, bandno))) {
int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
if (bpass_csty_symbol)
t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
else
t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?
-mask : mask;
ff_jpeg2000_set_significance(t1, x, y,
t1->data[y][x] < 0);
}
t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;
}
}
}
static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
@@ -880,11 +881,11 @@ 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 seg_symbols, int vert_causal_ctx_csty_symbol)
{
int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
for (y0 = 0; y0 < height; y0 += 4)
for (y0 = 0; y0 < height; y0 += 4) {
for (x = 0; x < width; x++) {
if (y0 + 3 < height &&
!((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
@@ -906,11 +907,13 @@ static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
if (!dec) {
if (!(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
dec = ff_mqc_decode(&t1->mqc,
t1->mqc.cx_states +
ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
bandno));
if (!(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
int flags_mask = -1;
if (vert_causal_ctx_csty_symbol && y == y0 + 3)
flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE);
dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask,
bandno));
}
}
if (dec) {
int xorbit;
@@ -926,6 +929,7 @@ static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
t1->flags[y + 1][x + 1] &= ~JPEG2000_T1_VIS;
}
}
}
if (seg_symbols) {
int val;
val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
@@ -943,6 +947,9 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
int width, int height, int bandpos)
{
int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
int clnpass_cnt = 0;
int bpass_csty_symbol = codsty->cblk_style & JPEG2000_CBLK_BYPASS;
int vert_causal_ctx_csty_symbol = codsty->cblk_style & JPEG2000_CBLK_VSC;
for (y = 0; y < height; y++)
memset(t1->data[y], 0, width * sizeof(**t1->data));
@@ -960,14 +967,22 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
while (passno--) {
switch (pass_t) {
case 0:
decode_sigpass(t1, width, height, bpno + 1, bandpos);
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);
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;
}
@@ -1179,7 +1194,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
uint16_t *dst;
x = tile->comp[compno].coord[0][0] - s->image_offset_x;
dst = linel + (x * s->ncomponents + compno);
for (; x < s->avctx->width; x += s->cdx[compno]) {
for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) {
int val;
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
if (tile->codsty->transform == FF_DWT97)