[FFmpeg-devel] [PATCH] avfilter: add panorama filter
Paul B Mahol
onemda at gmail.com
Sat Dec 5 18:38:47 CET 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_panorama.c | 437 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 439 insertions(+)
create mode 100644 libavfilter/vf_panorama.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8884d1d..5e0321f 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -193,6 +193,7 @@ OBJS-$(CONFIG_OWDENOISE_FILTER) += vf_owdenoise.o
OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
OBJS-$(CONFIG_PALETTEGEN_FILTER) += vf_palettegen.o
OBJS-$(CONFIG_PALETTEUSE_FILTER) += vf_paletteuse.o dualinput.o framesync.o
+OBJS-$(CONFIG_PANORAMA_FILTER) += vf_panorama.o
OBJS-$(CONFIG_PERMS_FILTER) += f_perms.o
OBJS-$(CONFIG_PERSPECTIVE_FILTER) += vf_perspective.o
OBJS-$(CONFIG_PHASE_FILTER) += vf_phase.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 0eeef53..952bddf 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -214,6 +214,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(PAD, pad, vf);
REGISTER_FILTER(PALETTEGEN, palettegen, vf);
REGISTER_FILTER(PALETTEUSE, paletteuse, vf);
+ REGISTER_FILTER(PANORAMA, panorama, vf);
REGISTER_FILTER(PERMS, perms, vf);
REGISTER_FILTER(PERSPECTIVE, perspective, vf);
REGISTER_FILTER(PHASE, phase, vf);
diff --git a/libavfilter/vf_panorama.c b/libavfilter/vf_panorama.c
new file mode 100644
index 0000000..b6bba64
--- /dev/null
+++ b/libavfilter/vf_panorama.c
@@ -0,0 +1,437 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/eval.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+enum Projections {
+ SPHERE,
+ CUBE,
+ NB_PROJECTIONS,
+};
+
+enum Faces {
+ LEFT,
+ FRONT,
+ RIGHT,
+ TOP,
+ BACK,
+ DOWN,
+};
+
+struct XYRemap {
+ int vi, ui;
+ int v2, u2;
+ double a, b, c, d;
+};
+
+typedef struct PanoramaContext {
+ const AVClass *class;
+ int in, out;
+
+ int planewidth[4], planeheight[4];
+ int inplanewidth[4], inplaneheight[4];
+ int nb_planes;
+
+ struct XYRemap *remap[4];
+
+ int (*panorama)(struct PanoramaContext *s,
+ const uint8_t *src, uint8_t *dst,
+ int width, int height,
+ int in_linesize, int out_linesize,
+ struct XYRemap *remap);
+} PanoramaContext;
+
+#define OFFSET(x) offsetof(PanoramaContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption panorama_options[] = {
+ { "input", "set input projection", OFFSET(in), AV_OPT_TYPE_INT, {.i64=SPHERE}, 0, NB_PROJECTIONS-1, FLAGS, "in" },
+ { "s", "spheric", 0, AV_OPT_TYPE_CONST, {.i64=SPHERE}, 0, 0, FLAGS, "in" },
+ { "c", "cubic", 0, AV_OPT_TYPE_CONST, {.i64=CUBE}, 0, 0, FLAGS, "in" },
+ { "output", "set output projection", OFFSET(out), AV_OPT_TYPE_INT, {.i64=CUBE}, 0, NB_PROJECTIONS-1, FLAGS, "out" },
+ { "s", "spheric", 0, AV_OPT_TYPE_CONST, {.i64=SPHERE}, 0, 0, FLAGS, "out" },
+ { "c", "cubic", 0, AV_OPT_TYPE_CONST, {.i64=CUBE}, 0, 0, FLAGS, "out" },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(panorama);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
+ AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+ AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int bilinear(PanoramaContext *s,
+ const uint8_t *src, uint8_t *dst,
+ int width, int height,
+ int in_linesize, int out_linesize,
+ struct XYRemap *remap)
+{
+ double A, B, C, D;
+ int x, y;
+
+ for (y = 0; y < height; y++) {
+ uint8_t *d = dst + y * out_linesize;
+ for (x = 0; x < width; x++) {
+ struct XYRemap *r = &remap[y * width + x];
+
+ A = src[r->vi * in_linesize + r->ui];
+ B = src[r->vi * in_linesize + r->u2];
+ C = src[r->v2 * in_linesize + r->ui];
+ D = src[r->v2 * in_linesize + r->u2];
+ *d++ = round(A * r->a + B * r->b + C * r->c + D * r->d);
+ }
+ }
+
+ return 0;
+}
+
+static int nearest(PanoramaContext *s,
+ const uint8_t *src, uint8_t *dst,
+ int width, int height,
+ int in_linesize, int out_linesize,
+ struct XYRemap *remap)
+{
+ double A;
+ int x, y;
+
+ for (y = 0; y < height; y++) {
+ uint8_t *d = dst + y * out_linesize;
+ for (x = 0; x < width; x++) {
+ struct XYRemap *r = &remap[y * width + x];
+
+ A = src[r->vi * in_linesize + r->ui];
+ *d++ = A;
+ }
+ }
+
+ return 0;
+}
+
+static void to_cube_xyz(int i, int j, int face, double edge, double *x, double *y, double *z)
+{
+ double a = 2.0 * i / edge;
+ double b = 2.0 * j / edge;
+
+ if (face == BACK) {
+ *x = -1. ;
+ *y = 9. - a;
+ *z = 1. - b;
+ } else if (face == LEFT) {
+ *x = a - 1;
+ *y = -1. ;
+ *z = 1. - b;
+ } else if (face == FRONT) {
+ *x = 1. ;
+ *y = a - 3;
+ *z = 1. - b;
+ } else if (face == RIGHT) {
+ *x = 5. - a;
+ *y = 1. ;
+ *z = 1. - b;
+ } else if (face == TOP) {
+ *x = b - 1;
+ *y = a - 7;
+ *z = 1. ;
+ } else if (face == DOWN) {
+ *x = -b + 1;
+ *y = a -11;
+ *z = -1. ;
+ }
+}
+
+static void to_sphere_xyz(double theta, double phi, double *x, double *y, double *z)
+{
+ *x = cos(phi) * cos(theta);
+ *y = sin(phi);
+ *z = cos(phi) * sin(theta);
+}
+
+static void locate(double axis, double x, double y, double rad, int radius, double *ox, double *oy)
+{
+ double ratio = radius / axis;
+ double temp;
+
+ *ox = ratio * x;
+ *oy = ratio * y;
+
+ temp = *ox;
+ *ox = *ox * cos(rad) - *oy * sin(rad);
+ *oy = temp * sin(rad) + *oy * cos(rad);
+ *ox += radius;
+ *oy += radius;
+}
+
+static inline int equal(double a, double b, double epsilon)
+{
+ return fabs(a - b) < epsilon;
+}
+
+static inline int smaller(double a, double b, double epsilon)
+{
+ return ((a - b) < 0.0) && (!equal(a, b, epsilon));
+}
+
+static inline int in_range(double rd, double small, double large, double res)
+{
+ return !smaller(rd, small, res)
+ && smaller(rd, large, res);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AVFilterLink *inlink = ctx->inputs[0];
+ PanoramaContext *s = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int p, h, w;
+
+ if (s->in == SPHERE && s->out == CUBE) {
+ w = inlink->w / 4 * 6;
+ h = inlink->h / 2;
+ } else if (s->in == CUBE && s->out == SPHERE) {
+ w = inlink->w / 6 * 4;
+ h = inlink->h * 2;
+ } else if (s->in == s->out) {
+ w = inlink->w;
+ h = inlink->h;
+ } else {
+ av_assert0(0);
+ }
+
+ s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
+ s->planeheight[0] = s->planeheight[3] = h;
+ s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
+ s->planewidth[0] = s->planewidth[3] = w;
+
+ outlink->h = h;
+ outlink->w = w;
+
+ s->inplaneheight[1] = s->inplaneheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+ s->inplaneheight[0] = s->inplaneheight[3] = inlink->h;
+ s->inplanewidth[1] = s->inplanewidth[2] = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+ s->inplanewidth[0] = s->inplanewidth[3] = inlink->w;
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ for (p = 0; p < s->nb_planes; p++) {
+ s->remap[p] = av_calloc(s->planewidth[p] * s->planeheight[p], sizeof(struct XYRemap));
+ if (!s->remap[p])
+ return AVERROR(ENOMEM);
+ }
+
+ if (s->in == SPHERE && s->out == CUBE) {
+ for (p = 0; p < s->nb_planes; p++) {
+ int face, ui, vi, u2, v2;
+ double theta, R, phi, uf, vf, mu, nu, x, y, z;
+ int edge = s->planewidth[p] / 6;
+ int width = s->planewidth[p];
+ int height = s->planeheight[p];
+ int in_width = s->inplanewidth[p];
+ int in_height = s->inplaneheight[p];
+ int i, j;
+
+ for (i = 0; i < width; i++) {
+ face = i / edge;
+
+ for (j = 0; j < height; j++) {
+ struct XYRemap *r = &s->remap[p][j * width + i];
+
+ to_cube_xyz(i, j, face, edge, &x, &y, &z);
+ theta = atan2(y, x);
+ R = hypot(x , y);
+ phi = atan2(z , R);
+ uf = (2.0 * edge * (theta + M_PI) / M_PI);
+ vf = (2.0 * edge * (M_PI/2 - phi) / M_PI);
+
+ ui = floor(uf);
+ vi = floor(vf);
+ u2 = ui + 1;
+ v2 = vi + 1;
+ mu = uf - ui;
+ nu = vf - vi;
+ r->vi = av_clip(vi, 0, in_height - 1);
+ r->ui = ui % in_width;
+ r->v2 = av_clip(v2, 0, in_height - 1);
+ r->u2 = u2 % in_width;
+ r->a = (1 - mu) * (1 - nu);
+ r->b = mu * (1 - nu);
+ r->c = (1 - mu) * nu;
+ r->d = mu * nu;
+ }
+ }
+ }
+ s->panorama = bilinear;
+ } else if (s->in == CUBE && s->out == SPHERE) {
+ for (p = 0; p < s->nb_planes; p++) {
+ double theta, theta_norm, phi, phi_threshold, x, y, z, ox, oy;
+ int width = s->planewidth[p];
+ int height = s->planeheight[p];
+ int in_width = s->inplanewidth[p];
+ double res = M_PI_4 / (in_width / 6) / 10.0;
+ int radius = in_width / 12;
+ int face, i, j;
+
+ for (i = 0; i < width; i++) {
+ for (j = 0; j < height; j++) {
+ struct XYRemap *r = &s->remap[p][j * width + i];
+
+ x = (2. * i) / width - 1.;
+ y = (2. * j) / height - 1.;
+ theta = x * M_PI;
+ phi = y * M_PI_2;
+ to_sphere_xyz(theta, phi, &x, &y, &z);
+
+ if (in_range(theta, -M_PI_4, M_PI_4, res)) {
+ face = FRONT;
+ theta_norm = theta;
+ } else if (in_range(theta, -(M_PI_2 + M_PI_4), -M_PI_4, res)) {
+ face = LEFT;
+ theta_norm = theta + M_PI_2;
+ } else if (in_range(theta, M_PI_4, M_PI_2 + M_PI_4, res)) {
+ face = RIGHT;
+ theta_norm = theta - M_PI_2;
+ } else {
+ face = BACK;
+ theta_norm = theta + ((theta > 0) ? -M_PI : M_PI);
+ }
+
+ phi_threshold = atan2(1., 1. / cos(theta_norm));
+ if (phi > phi_threshold)
+ face = DOWN;
+ else if (phi < -phi_threshold)
+ face = TOP;
+ else
+ ;
+
+ switch (face) {
+ case LEFT:
+ locate(z, x, y, M_PI, radius, &ox, &oy);
+ break;
+ case FRONT:
+ locate(x, z, y, 0., radius, &ox, &oy);
+ break;
+ case RIGHT:
+ locate(z, y, x, M_PI_2, radius, &ox, &oy);
+ break;
+ case TOP:
+ locate(y, z, x, M_PI, radius, &ox, &oy);
+ break;
+ case BACK:
+ locate(x, y, z,-M_PI_2, radius, &ox, &oy);
+ break;
+ case DOWN:
+ locate(y, x, z,-M_PI_2, radius, &ox, &oy);
+ break;
+ }
+
+ ox += (in_width / 6) * face;
+ r->vi = oy;
+ r->ui = ox;
+ }
+ }
+ }
+ s->panorama = nearest;
+ }
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ PanoramaContext *s = ctx->priv;
+ AVFrame *out;
+ int plane;
+
+ if (s->in == s->out)
+ return ff_filter_frame(outlink, in);
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
+ av_frame_copy_props(out, in);
+
+ for (plane = 0; plane < s->nb_planes; plane++) {
+ s->panorama(s, in->data[plane], out->data[plane],
+ s->planewidth[plane], s->planeheight[plane],
+ in->linesize[plane], out->linesize[plane],
+ s->remap[plane]);
+ }
+
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ PanoramaContext *s = ctx->priv;
+ int p;
+
+ for (p = 0; p < s->nb_planes; p++)
+ av_freep(s->remap[p]);
+}
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_panorama = {
+ .name = "panorama",
+ .description = NULL_IF_CONFIG_SMALL("Convert panorama projection of video."),
+ .priv_size = sizeof(PanoramaContext),
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .priv_class = &panorama_class,
+};
--
1.9.1
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