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https://github.com/FFmpeg/FFmpeg.git
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j2k/jpeg2000: split stepsize in float & int variables
This is more clear and less prone to mistakes. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -248,7 +248,6 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
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Jpeg2000Band *band = reslevel->band + bandno;
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int cblkno, precno;
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int nb_precincts;
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double stepsize;
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/* TODO: Implementation of quantization step not finished,
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* see ISO/IEC 15444-1:2002 E.1 and A.6.4. */
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@ -257,13 +256,13 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
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int numbps;
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case JPEG2000_QSTY_NONE:
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/* TODO: to verify. No quantization in this case */
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stepsize = 1;
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band->f_stepsize = 1;
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break;
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case JPEG2000_QSTY_SI:
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/*TODO: Compute formula to implement. */
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numbps = cbps +
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lut_gain[codsty->transform][bandno + (reslevelno > 0)];
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stepsize = SHL(2048 + qntsty->mant[gbandno],
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band->f_stepsize = SHL(2048 + qntsty->mant[gbandno],
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2 + numbps - qntsty->expn[gbandno]);
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break;
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case JPEG2000_QSTY_SE:
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@ -276,21 +275,20 @@ int ff_j2k_init_component(Jpeg2000Component *comp,
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* but it works (compared to OpenJPEG). Why?
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* Further investigation needed. */
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gain = cbps;
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stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
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stepsize *= (qntsty->mant[gbandno] / 2048.0 + 1.0);
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band->f_stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
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band->f_stepsize *= (qntsty->mant[gbandno] / 2048.0 + 1.0);
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break;
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default:
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stepsize = 0;
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band->f_stepsize = 0;
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av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
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break;
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}
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/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
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* If not set output of entropic decoder is not correct. */
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if (!av_codec_is_encoder(avctx->codec))
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stepsize *= 0.5;
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/* BITEXACT computing case --> convert to int */
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// if (avctx->flags & CODEC_FLAG_BITEXACT)
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band->stepsize = stepsize * (1 << 16);
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band->f_stepsize *= 0.5;
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band->i_stepsize = band->f_stepsize * (1 << 16);
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/* computation of tbx_0, tbx_1, tby_0, tby_1
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* see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
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@ -179,7 +179,8 @@ typedef struct Jpeg2000Prec {
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typedef struct Jpeg2000Band {
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uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
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uint16_t log2_cblk_width, log2_cblk_height;
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uint32_t stepsize; // quantization stepsize (* 2^13)
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int i_stepsize; // quantization stepsize
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float f_stepsize; // quantization stepsize
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Jpeg2000Prec *prec;
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} Jpeg2000Band; // subband
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@ -827,7 +827,7 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
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for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
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idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
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datap[idx] =
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((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
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((int32_t)(t1->data[j][i]) * band->i_stepsize + (1 << 15)) >> 16;
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}
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}
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@ -802,7 +802,7 @@ static void truncpasses(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile)
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Jpeg2000Cblk *cblk = prec->cblk + cblkno;
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cblk->ninclpasses = getcut(cblk, s->lambda,
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(int64_t)dwt_norms[codsty->transform][bandpos][lev] * (int64_t)band->stepsize >> 16);
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(int64_t)dwt_norms[codsty->transform][bandpos][lev] * (int64_t)band->i_stepsize >> 16);
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}
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}
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}
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@ -863,7 +863,7 @@ static int encode_tile(Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int tileno
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int *ptr = t1.data[y-yy0];
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for (x = xx0; x < xx1; x++){
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*ptr = (comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x]);
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*ptr = (int64_t)*ptr * (int64_t)(16384 * 65536 / band->stepsize) >> 14 - NMSEDEC_FRACBITS;
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*ptr = (int64_t)*ptr * (int64_t)(16384 * 65536 / band->i_stepsize) >> 14 - NMSEDEC_FRACBITS;
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ptr++;
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}
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}
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@ -267,13 +267,13 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
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int numbps;
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case JPEG2000_QSTY_NONE:
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/* TODO: to verify. No quantization in this case */
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band->stepsize = (float) (1 << 13);
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band->f_stepsize = (float) (1 << 13);
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break;
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case JPEG2000_QSTY_SI:
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/*TODO: Compute formula to implement. */
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numbps = cbps +
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lut_gain[codsty->transform][bandno + (reslevelno > 0)];
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band->stepsize = (float)SHL(2048 + qntsty->mant[gbandno],
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band->f_stepsize = (float)SHL(2048 + qntsty->mant[gbandno],
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2 + numbps - qntsty->expn[gbandno]);
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break;
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case JPEG2000_QSTY_SE:
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@ -286,20 +286,20 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
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* but it works (compared to OpenJPEG). Why?
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* Further investigation needed. */
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gain = cbps;
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band->stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
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band->stepsize *= (float)qntsty->mant[gbandno] / 2048.0 + 1.0;
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band->f_stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
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band->f_stepsize *= (float)qntsty->mant[gbandno] / 2048.0 + 1.0;
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break;
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default:
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band->stepsize = 0;
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band->f_stepsize = 0;
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av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
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break;
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}
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/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
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* If not set output of entropic decoder is not correct. */
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band->stepsize *= 0.5;
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/* BITEXACT computing case --> convert to int */
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if (avctx->flags & CODEC_FLAG_BITEXACT)
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band->stepsize = (int32_t)(band->stepsize * (1 << 16));
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if (!av_codec_is_encoder(avctx->codec))
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band->f_stepsize *= 0.5;
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band->i_stepsize = (int32_t)(band->f_stepsize * (1 << 16));
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/* computation of tbx_0, tbx_1, tby_0, tby_1
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* see ISO/IEC 15444-1:2002 B.5 eq. B-15 and tbl B.1
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@ -176,12 +176,11 @@ typedef struct Jpeg2000Prec {
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uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
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} Jpeg2000Prec; // precinct
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/* TODO: stepsize can be float or integer depending on
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* reversible or irreversible transformation. */
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typedef struct Jpeg2000Band {
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uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
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uint16_t log2_cblk_width, log2_cblk_height;
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float stepsize; // quantization stepsize
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int i_stepsize; // quantization stepsize
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float f_stepsize; // quantization stepsize
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Jpeg2000Prec *prec;
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} Jpeg2000Band; // subband
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@ -930,7 +930,7 @@ static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
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for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
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for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
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idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
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datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
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datap[idx] = (float)(t1->data[j][i]) * band->f_stepsize;
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}
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}
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@ -946,7 +946,7 @@ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
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for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
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idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
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datap[idx] =
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((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
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((int32_t)(t1->data[j][i]) * band->i_stepsize + (1 << 15)) >> 16;
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}
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}
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