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jpeg2000: Refactor decode_packets

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Move the packet-specific parsers in separate functions.
This commit is contained in:
Luca Barbato 2015-09-11 04:29:49 +02:00
parent 29b00f880f
commit 1b709f23fb
1 changed files with 87 additions and 69 deletions
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156
libavcodec/jpeg2000dec.c
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@ -732,85 +732,103 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
return 0;
}
static int decode_pgod_lrcp(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int layno, reslevelno, compno, precno, ok_reslevel;
int ret;
for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
ok_reslevel = 1;
for (reslevelno = 0; ok_reslevel; reslevelno++) {
ok_reslevel = 0;
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
if (reslevelno < codsty->nreslevels) {
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
reslevelno;
ok_reslevel = 1;
for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
if ((ret = jpeg2000_decode_packet(s,
codsty, rlevel,
precno, layno,
qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
qntsty->nguardbits)) < 0)
return ret;
}
}
}
}
return 0;
}
static int decode_pgod_cprl(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int layno, reslevelno, compno, precno;
int ret, x, y;
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
/* Set bit stream buffer address according to tile-part.
* For DCinema one tile-part per component, so can be
* indexed by component. */
s->g = tile->tile_part[compno].tpg;
/* Position loop (y axis)
* TODO: Automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (y = 0; y < s->height; y += 256) {
/* Position loop (y axis)
* TODO: automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (x = 0; x < s->width; x += 256) {
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
uint16_t prcx, prcy;
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
(y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
continue;
if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
(x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
continue;
// check if a precinct exists
prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
precno = prcx + rlevel->num_precincts_x * prcy;
for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
if ((ret = jpeg2000_decode_packet(s, codsty, rlevel,
precno, layno,
qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
qntsty->nguardbits)) < 0)
return ret;
}
}
}
}
}
return 0;
}
static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int ret = 0;
int layno, reslevelno, compno, precno, ok_reslevel;
int x, y;
s->bit_index = 8;
switch (tile->codsty[0].prog_order) {
case JPEG2000_PGOD_LRCP:
for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
ok_reslevel = 1;
for (reslevelno = 0; ok_reslevel; reslevelno++) {
ok_reslevel = 0;
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
if (reslevelno < codsty->nreslevels) {
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
reslevelno;
ok_reslevel = 1;
for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
if ((ret = jpeg2000_decode_packet(s,
codsty, rlevel,
precno, layno,
qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
qntsty->nguardbits)) < 0)
return ret;
}
}
}
}
ret = decode_pgod_lrcp(s, tile);
break;
case JPEG2000_PGOD_CPRL:
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000CodingStyle *codsty = tile->codsty + compno;
Jpeg2000QuantStyle *qntsty = tile->qntsty + compno;
/* Set bit stream buffer address according to tile-part.
* For DCinema one tile-part per component, so can be
* indexed by component. */
s->g = tile->tile_part[compno].tpg;
/* Position loop (y axis)
* TODO: Automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (y = 0; y < s->height; y += 256) {
/* Position loop (y axis)
* TODO: automate computing of step 256.
* Fixed here, but to be computed before entering here. */
for (x = 0; x < s->width; x += 256) {
for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
uint16_t prcx, prcy;
uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r
Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
(y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
continue;
if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
(x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
continue;
// check if a precinct exists
prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
precno = prcx + rlevel->num_precincts_x * prcy;
for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
if ((ret = jpeg2000_decode_packet(s, codsty, rlevel,
precno, layno,
qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
qntsty->nguardbits)) < 0)
return ret;
}
}
}
}
}
ret = decode_pgod_cprl(s, tile);
break;
case JPEG2000_PGOD_RLCP: