* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+
+/**
+ * @file imgresample.c
+ * High quality image resampling with polyphase filters .
+ */
+
#include "avcodec.h"
#include "dsputil.h"
#define LINE_BUF_HEIGHT (NB_TAPS * 4)
struct ImgReSampleContext {
- int iwidth, iheight, owidth, oheight, topBand, bottomBand, leftBand, rightBand;
+ int iwidth, iheight, owidth, oheight;
+ int topBand, bottomBand, leftBand, rightBand;
+ int padtop, padbottom, padleft, padright;
+ int pad_owidth, pad_oheight;
int h_incr, v_incr;
int16_t h_filters[NB_PHASES][NB_TAPS] __align8; /* horizontal filters */
int16_t v_filters[NB_PHASES][NB_TAPS] __align8; /* vertical filters */
uint8_t *line_buf;
};
+void av_build_filter(int16_t *filter, double factor, int tap_count, int phase_count, int scale, int type);
+
static inline int get_phase(int pos)
{
return ((pos) >> (POS_FRAC_BITS - PHASE_BITS)) & ((1 << PHASE_BITS) - 1);
}
/* This function must be optimized */
-static void h_resample_fast(uint8_t *dst, int dst_width, uint8_t *src, int src_width,
- int src_start, int src_incr, int16_t *filters)
+static void h_resample_fast(uint8_t *dst, int dst_width, const uint8_t *src,
+ int src_width, int src_start, int src_incr,
+ int16_t *filters)
{
int src_pos, phase, sum, i;
- uint8_t *s;
+ const uint8_t *s;
int16_t *filter;
src_pos = src_start;
}
/* This function must be optimized */
-static void v_resample(uint8_t *dst, int dst_width, uint8_t *src, int wrap,
- int16_t *filter)
+static void v_resample(uint8_t *dst, int dst_width, const uint8_t *src,
+ int wrap, int16_t *filter)
{
int sum, i;
- uint8_t *s;
+ const uint8_t *s;
s = src;
for(i=0;i<dst_width;i++) {
#define DUMP(reg) movq_r2m(reg, tmp); printf(#reg "=%016Lx\n", tmp.uq);
/* XXX: do four pixels at a time */
-static void h_resample_fast4_mmx(uint8_t *dst, int dst_width, uint8_t *src, int src_width,
+static void h_resample_fast4_mmx(uint8_t *dst, int dst_width,
+ const uint8_t *src, int src_width,
int src_start, int src_incr, int16_t *filters)
{
int src_pos, phase;
- uint8_t *s;
+ const uint8_t *s;
int16_t *filter;
mmx_t tmp;
emms();
}
-static void v_resample4_mmx(uint8_t *dst, int dst_width, uint8_t *src, int wrap,
- int16_t *filter)
+static void v_resample4_mmx(uint8_t *dst, int dst_width, const uint8_t *src,
+ int wrap, int16_t *filter)
{
int sum, i, v;
- uint8_t *s;
+ const uint8_t *s;
mmx_t tmp;
mmx_t coefs[4];
signed short s[8];
} vec_ss_t;
-void v_resample16_altivec(uint8_t *dst, int dst_width, uint8_t *src, int wrap,
- int16_t *filter)
+void v_resample16_altivec(uint8_t *dst, int dst_width, const uint8_t *src,
+ int wrap, int16_t *filter)
{
int sum, i;
- uint8_t *s;
+ const uint8_t *s;
vector unsigned char *tv, tmp, dstv, zero;
vec_ss_t srchv[4], srclv[4], fv[4];
vector signed short zeros, sumhv, sumlv;
#endif
/* slow version to handle limit cases. Does not need optimisation */
-static void h_resample_slow(uint8_t *dst, int dst_width, uint8_t *src, int src_width,
+static void h_resample_slow(uint8_t *dst, int dst_width,
+ const uint8_t *src, int src_width,
int src_start, int src_incr, int16_t *filters)
{
int src_pos, phase, sum, j, v, i;
- uint8_t *s, *src_end;
+ const uint8_t *s, *src_end;
int16_t *filter;
src_end = src + src_width;
}
}
-static void h_resample(uint8_t *dst, int dst_width, uint8_t *src, int src_width,
- int src_start, int src_incr, int16_t *filters)
+static void h_resample(uint8_t *dst, int dst_width, const uint8_t *src,
+ int src_width, int src_start, int src_incr,
+ int16_t *filters)
{
int n, src_end;
&s->v_filters[phase_y][0]);
src_y += s->v_incr;
+
output += owrap;
}
}
-/* XXX: the following filter is quite naive, but it seems to suffice
- for 4 taps */
-static void build_filter(int16_t *filter, float factor)
-{
- int ph, i, v;
- float x, y, tab[NB_TAPS], norm, mult;
-
- /* if upsampling, only need to interpolate, no filter */
- if (factor > 1.0)
- factor = 1.0;
-
- for(ph=0;ph<NB_PHASES;ph++) {
- norm = 0;
- for(i=0;i<NB_TAPS;i++) {
-
- x = M_PI * ((float)(i - FCENTER) - (float)ph / NB_PHASES) * factor;
- if (x == 0)
- y = 1.0;
- else
- y = sin(x) / x;
- tab[i] = y;
- norm += y;
- }
-
- /* normalize so that an uniform color remains the same */
- mult = (float)(1 << FILTER_BITS) / norm;
- for(i=0;i<NB_TAPS;i++) {
- v = (int)(tab[i] * mult);
- filter[ph * NB_TAPS + i] = v;
- }
- }
-}
-
ImgReSampleContext *img_resample_init(int owidth, int oheight,
int iwidth, int iheight)
{
- return img_resample_full_init(owidth, oheight, iwidth, iheight, 0, 0, 0, 0);
+ return img_resample_full_init(owidth, oheight, iwidth, iheight,
+ 0, 0, 0, 0, 0, 0, 0, 0);
}
ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
int iwidth, int iheight,
int topBand, int bottomBand,
- int leftBand, int rightBand)
+ int leftBand, int rightBand,
+ int padtop, int padbottom,
+ int padleft, int padright)
{
ImgReSampleContext *s;
s->oheight = oheight;
s->iwidth = iwidth;
s->iheight = iheight;
+
s->topBand = topBand;
s->bottomBand = bottomBand;
s->leftBand = leftBand;
s->rightBand = rightBand;
- s->h_incr = ((iwidth - leftBand - rightBand) * POS_FRAC) / owidth;
- s->v_incr = ((iheight - topBand - bottomBand) * POS_FRAC) / oheight;
-
- build_filter(&s->h_filters[0][0], (float) owidth / (float) (iwidth - leftBand - rightBand));
- build_filter(&s->v_filters[0][0], (float) oheight / (float) (iheight - topBand - bottomBand));
+ s->padtop = padtop;
+ s->padbottom = padbottom;
+ s->padleft = padleft;
+ s->padright = padright;
+
+ s->pad_owidth = owidth - (padleft + padright);
+ s->pad_oheight = oheight - (padtop + padbottom);
+
+ s->h_incr = ((iwidth - leftBand - rightBand) * POS_FRAC) / s->pad_owidth;
+ s->v_incr = ((iheight - topBand - bottomBand) * POS_FRAC) / s->pad_oheight;
+
+ av_build_filter(&s->h_filters[0][0], (float) s->pad_owidth /
+ (float) (iwidth - leftBand - rightBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);
+ av_build_filter(&s->v_filters[0][0], (float) s->pad_oheight /
+ (float) (iheight - topBand - bottomBand), NB_TAPS, NB_PHASES, 1<<FILTER_BITS, 0);
return s;
- fail:
+fail:
av_free(s);
return NULL;
}
void img_resample(ImgReSampleContext *s,
- AVPicture *output, AVPicture *input)
+ AVPicture *output, const AVPicture *input)
{
int i, shift;
+ uint8_t* optr;
- for(i=0;i<3;i++) {
+ for (i=0;i<3;i++) {
shift = (i == 0) ? 0 : 1;
- component_resample(s, output->data[i], output->linesize[i],
- s->owidth >> shift, s->oheight >> shift,
- input->data[i] + (input->linesize[i] * (s->topBand >> shift)) + (s->leftBand >> shift),
- input->linesize[i], ((s->iwidth - s->leftBand - s->rightBand) >> shift),
+
+ optr = output->data[i] + (((output->linesize[i] *
+ s->padtop) + s->padleft) >> shift);
+
+ component_resample(s, optr, output->linesize[i],
+ s->pad_owidth >> shift, s->pad_oheight >> shift,
+ input->data[i] + (input->linesize[i] *
+ (s->topBand >> shift)) + (s->leftBand >> shift),
+ input->linesize[i], ((s->iwidth - s->leftBand -
+ s->rightBand) >> shift),
(s->iheight - s->topBand - s->bottomBand) >> shift);
}
}
projects / ffmpeg / blobdiff