From 0bcbbd87050974c83b19a7497aa49b6c1e0f7720 Mon Sep 17 00:00:00 2001 From: arpi Date: Fri, 27 Sep 2002 21:08:36 +0000 Subject: -vf eq2, LUT-based brightness/contrast/gamma correction (Y-only) by Hampa Hug git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7518 b3059339-0415-0410-9bf9-f77b7e298cf2 --- libmpcodecs/vf_eq2.c | 236 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 236 insertions(+) create mode 100644 libmpcodecs/vf_eq2.c (limited to 'libmpcodecs/vf_eq2.c') diff --git a/libmpcodecs/vf_eq2.c b/libmpcodecs/vf_eq2.c new file mode 100644 index 0000000000..3f16273ad8 --- /dev/null +++ b/libmpcodecs/vf_eq2.c @@ -0,0 +1,236 @@ +/* + * vf_eq2.c + * + * Extended software equalizer (brightness, contrast, gamma) + * + * Hampa Hug + * + */ + +#include +#include +#include +#include + +#include "../config.h" +#include "../mp_msg.h" + +#include "img_format.h" +#include "mp_image.h" +#include "vf.h" + + +typedef struct vf_priv_s { + unsigned char *buf; + int buf_w; + int buf_h; + + double contrast; + double bright; + double gamma; + + unsigned char lut[256]; +} vf_eq2_t; + + +static +void create_lut (vf_eq2_t *eq2) +{ + unsigned i; + double c, b, g; + double v; + + c = eq2->contrast; + b = eq2->bright; + g = eq2->gamma; + + if ((g < 0.001) || (g > 1000.0)) { + g = 1.0; + } + + fprintf (stderr, "vf_eq2: c=%.2f b=%.2f g=%.4f\n", c, b, g); + + g = 1.0 / g; + + for (i = 0; i < 256; i++) { + v = (double) i / 255.0; + v = c * (v - 0.5) + 0.5 + b; + + if (v <= 0.0) { + eq2->lut[i] = 0; + } + else { + v = pow (v, g); + + if (v >= 1.0) { + eq2->lut[i] = 255; + } + else { + eq2->lut[i] = (unsigned char) (256.0 * v); + } + } + } +} + +/* could inline this */ +static +void process (unsigned char *dst, int dstride, unsigned char *src, int sstride, + int w, int h, unsigned char lut[256]) +{ + int i, j; + + for (j = 0; j < h; j++) { + for (i = 0; i < w; i++) { + *(dst++) = lut[*(src++)]; + } + + src += sstride - w; + dst += dstride - w; + } +} + +static +int put_image (vf_instance_t *vf, mp_image_t *src) +{ + mp_image_t *dst; + vf_eq2_t *eq2; + + eq2 = vf->priv; + + if ((eq2->buf == NULL) || (eq2->buf_w != src->stride[0]) || (eq2->buf_h != src->h)) { + eq2->buf = (unsigned char *) realloc (eq2->buf, src->stride[0] * src->h); + eq2->buf_w = src->stride[0]; + eq2->buf_h = src->h; + } + + dst = vf_get_image (vf->next, src->imgfmt, MP_IMGTYPE_EXPORT, 0, src->w, src->h); + + dst->stride[0] = src->stride[0]; + dst->stride[1] = src->stride[1]; + dst->stride[2] = src->stride[2]; + dst->planes[0] = vf->priv->buf; + dst->planes[1] = src->planes[1]; + dst->planes[2] = src->planes[2]; + + process ( + dst->planes[0], dst->stride[0], src->planes[0], src->stride[0], + src->w, src->h, eq2->lut + ); + + return vf_next_put_image (vf, dst); +} + +static +int control (vf_instance_t *vf, int request, void *data) +{ + vf_equalizer_t *eq; + + switch (request) { + case VFCTRL_SET_EQUALIZER: + eq = (vf_equalizer_t *) data; + + if (strcmp (eq->item, "gamma") == 0) { + vf->priv->gamma = exp (log (8.0) * eq->value / 100.0); + create_lut (vf->priv); + return CONTROL_TRUE; + } + else if (strcmp (eq->item, "contrast") == 0) { + vf->priv->contrast = (1.0 / 100.0) * (eq->value + 100); + create_lut (vf->priv); + return CONTROL_TRUE; + } + else if (strcmp (eq->item, "brightness") == 0) { + vf->priv->bright = (1.0 / 100.0) * eq->value; + create_lut (vf->priv); + return CONTROL_TRUE; + } + break; + + case VFCTRL_GET_EQUALIZER: + eq = (vf_equalizer_t *) data; + if (strcmp (eq->item, "gamma") == 0) { + eq->value = (int) (100.0 * log (vf->priv->gamma) / log (8.0)); + return CONTROL_TRUE; + } + else if (strcmp (eq->item, "contrast") == 0) { + eq->value = (int) (100.0 * vf->priv->contrast) - 100; + return CONTROL_TRUE; + } + else if (strcmp (eq->item, "brightness") == 0) { + eq->value = (int) (100.0 * vf->priv->bright); + return CONTROL_TRUE; + } + break; + } + + return vf_next_control (vf, request, data); +} + +static +int query_format (vf_instance_t *vf, unsigned fmt) +{ + switch (fmt) { + case IMGFMT_YVU9: + case IMGFMT_IF09: + case IMGFMT_YV12: + case IMGFMT_I420: + case IMGFMT_IYUV: + case IMGFMT_CLPL: + case IMGFMT_Y800: + case IMGFMT_Y8: + case IMGFMT_NV12: + case IMGFMT_444P: + case IMGFMT_422P: + case IMGFMT_411P: + return vf_next_query_format (vf, fmt); + } + + return 0; +} + +static +void uninit (vf_instance_t *vf) +{ + if (vf->priv != NULL) { + free (vf->priv->buf); + free (vf->priv); + } +} + +static +int open (vf_instance_t *vf, char *args) +{ + vf_eq2_t *eq2; + + vf->control = control; + vf->query_format = query_format; + vf->put_image = put_image; + vf->uninit = uninit; + + vf->priv = (vf_eq2_t *) malloc (sizeof (vf_eq2_t)); + eq2 = vf->priv; + + eq2->buf = NULL; + eq2->buf_w = 0; + eq2->buf_h = 0; + + eq2->gamma = 1.0; + eq2->contrast = 1.0; + eq2->bright = 0.0; + + if (args != NULL) { + sscanf (args, "%lf:%lf:%lf", &eq2->gamma, &eq2->contrast, &eq2->bright); + } + + create_lut (eq2); + + return 1; +} + +vf_info_t vf_info_eq2 = { + "extended software equalizer", + "eq2", + "Hampa Hug", + "", + &open +}; -- cgit v1.2.3