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| author | Michael Niedermayer <michaelni@gmx.at> | 2013-07-01 10:01:38 +0200 |
|---|---|---|
| committer | Luca Barbato <lu_zero@gentoo.org> | 2013-07-02 20:05:48 +0200 |
| commit | c4604b8792cad3194e6c1dd107735a79037dc77f (patch) | |
| tree | cac79f0bf0f0a84b74eeea41f25b907e5aaa2f4f /libavcodec | |
| parent | 22e18ea39e371030cc78973d1b46aae45a7ea215 (diff) | |
| download | ffmpeg-c4604b8792cad3194e6c1dd107735a79037dc77f.tar.gz | |
jpeg2000: Merge rescaling with interleaving in 9/7 IDWT
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/jpeg2000dwt.c | 34 |
1 files changed, 10 insertions, 24 deletions
diff --git a/libavcodec/jpeg2000dwt.c b/libavcodec/jpeg2000dwt.c index 0601e5aed3..6642a53ac8 100644 --- a/libavcodec/jpeg2000dwt.c +++ b/libavcodec/jpeg2000dwt.c @@ -153,13 +153,6 @@ static void sr_1d97_float(float *p, int i0, int i1) extend97_float(p, i0, i1); - /*step 1*/ - for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++) - p[2 * i] *= F_LFTG_K; - /* step 2*/ - for (i = i0 / 2 - 2; i < i1 / 2 + 2; i++) - p[2 * i + 1] *= F_LFTG_X; - /* step 3*/ for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++) p[2 * i] -= F_LFTG_DELTA * (p[2 * i - 1] + p[2 * i + 1]); /* step 4 */ @@ -195,9 +188,9 @@ static void dwt_decode97_float(DWTContext *s, float *t) int i, j = 0; // copy with interleaving for (i = mh; i < lh; i += 2, j++) - l[i] = data[w * lp + j]; + l[i] = data[w * lp + j] * F_LFTG_K; for (i = 1 - mh; i < lh; i += 2, j++) - l[i] = data[w * lp + j]; + l[i] = data[w * lp + j] * F_LFTG_X; sr_1d97_float(line, mh, mh + lh); @@ -211,9 +204,9 @@ static void dwt_decode97_float(DWTContext *s, float *t) int i, j = 0; // copy with interleaving for (i = mv; i < lv; i += 2, j++) - l[i] = data[w * j + lp]; + l[i] = data[w * j + lp] * F_LFTG_K; for (i = 1 - mv; i < lv; i += 2, j++) - l[i] = data[w * j + lp]; + l[i] = data[w * j + lp] * F_LFTG_X; sr_1d97_float(line, mv, mv + lv); @@ -232,13 +225,6 @@ static void sr_1d97_int(int32_t *p, int i0, int i1) extend97_int(p, i0, i1); - /*step 1*/ - for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++) - p[2 * i] = ((p[2 * i] * I_LFTG_K) + (1 << 15)) >> 16; - /* step 2*/ - for (i = i0 / 2 - 2; i < i1 / 2 + 2; i++) - p[2 * i + 1] = ((p[2 * i + 1] * I_LFTG_X) + (1 << 15)) >> 16; - /* step 3*/ for (i = i0 / 2 - 1; i < i1 / 2 + 2; i++) p[2 * i] -= (I_LFTG_DELTA * (p[2 * i - 1] + p[2 * i + 1]) + (1 << 15)) >> 16; /* step 4 */ @@ -272,11 +258,11 @@ static void dwt_decode97_int(DWTContext *s, int32_t *t) l = line + mh; for (lp = 0; lp < lv; lp++) { int i, j = 0; - // copy with interleaving + // rescale with interleaving for (i = mh; i < lh; i += 2, j++) - l[i] = data[w * lp + j]; + l[i] = ((data[w * lp + j] * I_LFTG_K) + (1 << 15)) >> 16; for (i = 1 - mh; i < lh; i += 2, j++) - l[i] = data[w * lp + j]; + l[i] = ((data[w * lp + j] * I_LFTG_X) + (1 << 15)) >> 16; sr_1d97_int(line, mh, mh + lh); @@ -288,11 +274,11 @@ static void dwt_decode97_int(DWTContext *s, int32_t *t) l = line + mv; for (lp = 0; lp < lh; lp++) { int i, j = 0; - // copy with interleaving + // rescale with interleaving for (i = mv; i < lv; i += 2, j++) - l[i] = data[w * j + lp]; + l[i] = ((data[w * j + lp] * I_LFTG_K) + (1 << 15)) >> 16; for (i = 1 - mv; i < lv; i += 2, j++) - l[i] = data[w * j + lp]; + l[i] = ((data[w * j + lp] * I_LFTG_X) + (1 << 15)) >> 16; sr_1d97_int(line, mv, mv + lv); |