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jpeg2000: Factor out band initialization

tags/n3.0
Luca Barbato 10 years ago
parent
1b709f23fb
commit
7fb93eae43
1 changed files with 213 additions and 193 deletions
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  1. +213
    -193
      libavcodec/jpeg2000.c

+ 213
- 193
libavcodec/jpeg2000.c View File

@@ -195,13 +195,219 @@ void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y,

static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } };

static int init_band(AVCodecContext *avctx,
Jpeg2000ResLevel *reslevel,
Jpeg2000Component *comp,
Jpeg2000CodingStyle *codsty,
Jpeg2000QuantStyle *qntsty,
int bandno, int gbandno, int reslevelno,
int cbps, int dx, int dy)
{
Jpeg2000Band *band = reslevel->band + bandno;
uint8_t log2_band_prec_width, log2_band_prec_height;
int declvl = codsty->nreslevels - reslevelno; // N_L -r see ISO/IEC 15444-1:2002 B.5
int cblkno, precno;
int nb_precincts;
int i, j;

/* TODO: Implementation of quantization step not finished,
* see ISO/IEC 15444-1:2002 E.1 and A.6.4. */
switch (qntsty->quantsty) {
uint8_t gain;
int numbps;
case JPEG2000_QSTY_NONE:
/* TODO: to verify. No quantization in this case */
band->f_stepsize = 1;
break;
case JPEG2000_QSTY_SI:
/*TODO: Compute formula to implement. */
numbps = cbps +
lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];
band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],
2 + numbps - qntsty->expn[gbandno]);
break;
case JPEG2000_QSTY_SE:
/* Exponent quantization step.
* Formula:
* delta_b = 2 ^ (R_b - expn_b) * (1 + (mant_b / 2 ^ 11))
* R_b = R_I + log2 (gain_b )
* see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */
/* TODO/WARN: value of log2 (gain_b ) not taken into account
* but it works (compared to OpenJPEG). Why?
* Further investigation needed. */
gain = cbps;
band->f_stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0;
break;
default:
band->f_stepsize = 0;
av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
break;
}
/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
* If not set output of entropic decoder is not correct. */
if (!av_codec_is_encoder(avctx->codec))
band->f_stepsize *= 0.5;

band->i_stepsize = band->f_stepsize * (1 << 16);

/* computation of tbx_0, tbx_1, tby_0, tby_1
* see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
* codeblock width and height is computed for
* DCI JPEG 2000 codeblock_width = codeblock_width = 32 = 2 ^ 5 */
if (reslevelno == 0) {
/* for reslevelno = 0, only one band, x0_b = y0_b = 0 */
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0],
declvl - 1);
log2_band_prec_width = reslevel->log2_prec_width;
log2_band_prec_height = reslevel->log2_prec_height;
/* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
reslevel->log2_prec_width);
band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
reslevel->log2_prec_height);
} else {
/* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */
/* x0_b and y0_b are computed with ((bandno + 1 >> i) & 1) */
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
/* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0] -
(((bandno + 1 >> i) & 1) << declvl - 1),
declvl);
/* TODO: Manage case of 3 band offsets here or
* in coding/decoding function? */

/* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
reslevel->log2_prec_width - 1);
band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
reslevel->log2_prec_height - 1);

log2_band_prec_width = reslevel->log2_prec_width - 1;
log2_band_prec_height = reslevel->log2_prec_height - 1;
}

for (j = 0; j < 2; j++)
band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);
for (j = 0; j < 2; j++)
band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);

nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;
band->prec = av_mallocz_array(nb_precincts, sizeof(*band->prec));
if (!band->prec)
return AVERROR(ENOMEM);

for (precno = 0; precno < nb_precincts; precno++) {
Jpeg2000Prec *prec = band->prec + precno;
int nb_codeblocks;

/* TODO: Explain formula for JPEG200 DCINEMA. */
/* TODO: Verify with previous count of codeblocks per band */

/* Compute P_x0 */
prec->coord[0][0] = (precno % reslevel->num_precincts_x) *
(1 << log2_band_prec_width);
prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);

/* Compute P_y0 */
prec->coord[1][0] = (precno / reslevel->num_precincts_x) *
(1 << log2_band_prec_height);
prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);

/* Compute P_x1 */
prec->coord[0][1] = prec->coord[0][0] +
(1 << log2_band_prec_width);
prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);

/* Compute P_y1 */
prec->coord[1][1] = prec->coord[1][0] +
(1 << log2_band_prec_height);
prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);

prec->nb_codeblocks_width =
ff_jpeg2000_ceildivpow2(prec->coord[0][1] -
prec->coord[0][0],
band->log2_cblk_width);
prec->nb_codeblocks_height =
ff_jpeg2000_ceildivpow2(prec->coord[1][1] -
prec->coord[1][0],
band->log2_cblk_height);

/* Tag trees initialization */
prec->cblkincl =
ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
prec->nb_codeblocks_height);
if (!prec->cblkincl)
return AVERROR(ENOMEM);

prec->zerobits =
ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
prec->nb_codeblocks_height);
if (!prec->zerobits)
return AVERROR(ENOMEM);

nb_codeblocks = prec->nb_codeblocks_width * prec->nb_codeblocks_height;
prec->cblk = av_mallocz_array(nb_codeblocks, sizeof(*prec->cblk));
if (!prec->cblk)
return AVERROR(ENOMEM);
for (cblkno = 0; cblkno < nb_codeblocks; cblkno++) {
Jpeg2000Cblk *cblk = prec->cblk + cblkno;
uint16_t Cx0, Cy0;

/* Compute coordinates of codeblocks */
/* Compute Cx0*/
Cx0 = (prec->coord[0][0] >> band->log2_cblk_width) << band->log2_cblk_width;
Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width) << band->log2_cblk_width);
cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);

/* Compute Cy0*/
Cy0 = (prec->coord[1][0] >> band->log2_cblk_height) << band->log2_cblk_height;
Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width) << band->log2_cblk_height);
cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);

/* Compute Cx1 */
cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),
prec->coord[0][1]);

/* Compute Cy1 */
cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),
prec->coord[1][1]);
/* Update code-blocks coordinates according sub-band position */
if ((bandno + !!reslevelno) & 1) {
cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] -
comp->reslevel[reslevelno-1].coord[0][0];
cblk->coord[0][1] += comp->reslevel[reslevelno-1].coord[0][1] -
comp->reslevel[reslevelno-1].coord[0][0];
}
if ((bandno + !!reslevelno) & 2) {
cblk->coord[1][0] += comp->reslevel[reslevelno-1].coord[1][1] -
comp->reslevel[reslevelno-1].coord[1][0];
cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] -
comp->reslevel[reslevelno-1].coord[1][0];
}

cblk->zero = 0;
cblk->lblock = 3;
cblk->length = 0;
cblk->lengthinc = 0;
cblk->npasses = 0;
}
}

return 0;
}

int ff_jpeg2000_init_component(Jpeg2000Component *comp,
Jpeg2000CodingStyle *codsty,
Jpeg2000QuantStyle *qntsty,
int cbps, int dx, int dy,
AVCodecContext *avctx)
{
uint8_t log2_band_prec_width, log2_band_prec_height;
int reslevelno, bandno, gbandno = 0, ret, i, j;
uint32_t csize;

@@ -282,198 +488,12 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
return AVERROR(ENOMEM);

for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++) {
Jpeg2000Band *band = reslevel->band + bandno;
int cblkno, precno;
int nb_precincts;

/* TODO: Implementation of quantization step not finished,
* see ISO/IEC 15444-1:2002 E.1 and A.6.4. */
switch (qntsty->quantsty) {
uint8_t gain;
int numbps;
case JPEG2000_QSTY_NONE:
/* TODO: to verify. No quantization in this case */
band->f_stepsize = 1;
break;
case JPEG2000_QSTY_SI:
/*TODO: Compute formula to implement. */
numbps = cbps +
lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];
band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],
2 + numbps - qntsty->expn[gbandno]);
break;
case JPEG2000_QSTY_SE:
/* Exponent quantization step.
* Formula:
* delta_b = 2 ^ (R_b - expn_b) * (1 + (mant_b / 2 ^ 11))
* R_b = R_I + log2 (gain_b )
* see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */
/* TODO/WARN: value of log2 (gain_b ) not taken into account
* but it works (compared to OpenJPEG). Why?
* Further investigation needed. */
gain = cbps;
band->f_stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0;
break;
default:
band->f_stepsize = 0;
av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
break;
}
/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
* If not set output of entropic decoder is not correct. */
if (!av_codec_is_encoder(avctx->codec))
band->f_stepsize *= 0.5;

band->i_stepsize = band->f_stepsize * (1 << 16);

/* computation of tbx_0, tbx_1, tby_0, tby_1
* see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
* codeblock width and height is computed for
* DCI JPEG 2000 codeblock_width = codeblock_width = 32 = 2 ^ 5 */
if (reslevelno == 0) {
/* for reslevelno = 0, only one band, x0_b = y0_b = 0 */
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0],
declvl - 1);
log2_band_prec_width = reslevel->log2_prec_width;
log2_band_prec_height = reslevel->log2_prec_height;
/* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
reslevel->log2_prec_width);
band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
reslevel->log2_prec_height);
} else {
/* 3 bands x0_b = 1 y0_b = 0; x0_b = 0 y0_b = 1; x0_b = y0_b = 1 */
/* x0_b and y0_b are computed with ((bandno + 1 >> i) & 1) */
for (i = 0; i < 2; i++)
for (j = 0; j < 2; j++)
/* Formula example for tbx_0 = ceildiv((tcx_0 - 2 ^ (declvl - 1) * x0_b) / declvl) */
band->coord[i][j] =
ff_jpeg2000_ceildivpow2(comp->coord_o[i][j] - comp->coord_o[i][0] -
(((bandno + 1 >> i) & 1) << declvl - 1),
declvl);
/* TODO: Manage case of 3 band offsets here or
* in coding/decoding function? */

/* see ISO/IEC 15444-1:2002 eq. B-17 and eq. B-15 */
band->log2_cblk_width = FFMIN(codsty->log2_cblk_width,
reslevel->log2_prec_width - 1);
band->log2_cblk_height = FFMIN(codsty->log2_cblk_height,
reslevel->log2_prec_height - 1);

log2_band_prec_width = reslevel->log2_prec_width - 1;
log2_band_prec_height = reslevel->log2_prec_height - 1;
}

for (j = 0; j < 2; j++)
band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);
for (j = 0; j < 2; j++)
band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);

nb_precincts = reslevel->num_precincts_x * reslevel->num_precincts_y;
band->prec = av_mallocz_array(nb_precincts, sizeof(*band->prec));
if (!band->prec)
return AVERROR(ENOMEM);

for (precno = 0; precno < nb_precincts; precno++) {
Jpeg2000Prec *prec = band->prec + precno;
int nb_codeblocks;

/* TODO: Explain formula for JPEG200 DCINEMA. */
/* TODO: Verify with previous count of codeblocks per band */

/* Compute P_x0 */
prec->coord[0][0] = (precno % reslevel->num_precincts_x) *
(1 << log2_band_prec_width);
prec->coord[0][0] = FFMAX(prec->coord[0][0], band->coord[0][0]);

/* Compute P_y0 */
prec->coord[1][0] = (precno / reslevel->num_precincts_x) *
(1 << log2_band_prec_height);
prec->coord[1][0] = FFMAX(prec->coord[1][0], band->coord[1][0]);

/* Compute P_x1 */
prec->coord[0][1] = prec->coord[0][0] +
(1 << log2_band_prec_width);
prec->coord[0][1] = FFMIN(prec->coord[0][1], band->coord[0][1]);

/* Compute P_y1 */
prec->coord[1][1] = prec->coord[1][0] +
(1 << log2_band_prec_height);
prec->coord[1][1] = FFMIN(prec->coord[1][1], band->coord[1][1]);

prec->nb_codeblocks_width =
ff_jpeg2000_ceildivpow2(prec->coord[0][1] -
prec->coord[0][0],
band->log2_cblk_width);
prec->nb_codeblocks_height =
ff_jpeg2000_ceildivpow2(prec->coord[1][1] -
prec->coord[1][0],
band->log2_cblk_height);

/* Tag trees initialization */
prec->cblkincl =
ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
prec->nb_codeblocks_height);
if (!prec->cblkincl)
return AVERROR(ENOMEM);

prec->zerobits =
ff_jpeg2000_tag_tree_init(prec->nb_codeblocks_width,
prec->nb_codeblocks_height);
if (!prec->zerobits)
return AVERROR(ENOMEM);

nb_codeblocks = prec->nb_codeblocks_width * prec->nb_codeblocks_height;
prec->cblk = av_mallocz_array(nb_codeblocks, sizeof(*prec->cblk));
if (!prec->cblk)
return AVERROR(ENOMEM);
for (cblkno = 0; cblkno < nb_codeblocks; cblkno++) {
Jpeg2000Cblk *cblk = prec->cblk + cblkno;
uint16_t Cx0, Cy0;

/* Compute coordinates of codeblocks */
/* Compute Cx0*/
Cx0 = (prec->coord[0][0] >> band->log2_cblk_width) << band->log2_cblk_width;
Cx0 = Cx0 + ((cblkno % prec->nb_codeblocks_width) << band->log2_cblk_width);
cblk->coord[0][0] = FFMAX(Cx0, prec->coord[0][0]);

/* Compute Cy0*/
Cy0 = (prec->coord[1][0] >> band->log2_cblk_height) << band->log2_cblk_height;
Cy0 = Cy0 + ((cblkno / prec->nb_codeblocks_width) << band->log2_cblk_height);
cblk->coord[1][0] = FFMAX(Cy0, prec->coord[1][0]);

/* Compute Cx1 */
cblk->coord[0][1] = FFMIN(Cx0 + (1 << band->log2_cblk_width),
prec->coord[0][1]);

/* Compute Cy1 */
cblk->coord[1][1] = FFMIN(Cy0 + (1 << band->log2_cblk_height),
prec->coord[1][1]);
/* Update code-blocks coordinates according sub-band position */
if ((bandno + !!reslevelno) & 1) {
cblk->coord[0][0] += comp->reslevel[reslevelno-1].coord[0][1] -
comp->reslevel[reslevelno-1].coord[0][0];
cblk->coord[0][1] += comp->reslevel[reslevelno-1].coord[0][1] -
comp->reslevel[reslevelno-1].coord[0][0];
}
if ((bandno + !!reslevelno) & 2) {
cblk->coord[1][0] += comp->reslevel[reslevelno-1].coord[1][1] -
comp->reslevel[reslevelno-1].coord[1][0];
cblk->coord[1][1] += comp->reslevel[reslevelno-1].coord[1][1] -
comp->reslevel[reslevelno-1].coord[1][0];
}

cblk->zero = 0;
cblk->lblock = 3;
cblk->length = 0;
cblk->lengthinc = 0;
cblk->npasses = 0;
}
}
ret = init_band(avctx, reslevel,
comp, codsty, qntsty,
bandno, gbandno, reslevelno,
cbps, dx, dy);
if (ret < 0)
return ret;
}
}
return 0;


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