Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_panorama.c | 304 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 306 insertions(+)
create mode 100644 libavfilter/vf_panorama.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 740a640..36ade75 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -192,6 +192,7 @@ 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 6557612..c2ea7e5 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -213,6 +213,7 @@ 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..4cc0831
--- /dev/null
+++ b/libavfilter/vf_panorama.c
@@ -0,0 +1,304 @@
+/*
+ * 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 {
+ EQUIRECTANGULAR,
+ CUBIC,
+ NB_PROJECTIONS,
+};
+
+struct XYRemap {
+ int vi, ui;
+ int v2, u2;
+ float 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_width, int in_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[] = {
+ { "i", "set input projection", OFFSET(in), AV_OPT_TYPE_INT,
{.i64=EQUIRECTANGULAR}, 0, NB_PROJECTIONS-1, FLAGS },
+ { "o", "set output projection", OFFSET(out), AV_OPT_TYPE_INT,
{.i64=CUBIC}, 0, NB_PROJECTIONS-1, FLAGS },
+ { 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 void to_xyz(int i, int j, int face, float edge, float *x, float *y,
float *z)
+{
+ float a = 2.0 * i / edge;
+ float b = 2.0 * j / edge;
+
+ if (face == 0) { // back
+ *x = -1.0;
+ *y = 1.0 - a;
+ *z = 3.0 - b;
+ } else if (face == 1) { // left
+ *x = a - 3.0;
+ *y = -1.0;
+ *z = 3.0 - b;
+ } else if (face == 2) { // front
+ *x = 1.0;
+ *y = a - 5.0;
+ *z = 3.0 - b;
+ } else if (face == 3) { // right
+ *x = 7.0 - a;
+ *y = 1.0;
+ *z = 3.0 - b;
+ } else if (face == 4) { // top
+ *x = b - 1.0;
+ *y = a - 5.0;
+ *z = 1.0;
+ } else if (face == 5) { // bottom
+ *x = 5.0 - b;
+ *y = a - 5.0;
+ *z = -1.0;
+ }
+}
+
+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;
+
+ if (s->in == EQUIRECTANGULAR && s->out == CUBIC) {
+ int w = inlink->w;
+ int h = inlink->w * 3 / 4;
+
+ 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;
+ } else {
+ av_assert0(0);
+ }
+
+ 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));
+
+ for (p = 0; p < s->nb_planes; p++) {
+ int face, face2, start, end, ui, vi, u2, v2;
+ float theta, R, phi, uf, vf, mu, nu, x, y, z;
+ int edge = s->planewidth[p] / 4;
+ int width = s->planewidth[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; // 0 - back, 1 - left 2 - front, 3 - right
+ if (face == 2) {
+ start = 0;
+ end = edge * 3;
+ } else {
+ start = edge;
+ end = edge * 2;
+ }
+
+ for (j = start; j < end; j++) {
+ struct XYRemap *r = &s->remap[p][j * width + i];
+
+ if (j < edge)
+ face2 = 4; // top
+ else if (j >= 2 * edge)
+ face2 = 5; // bottom
+ else
+ face2 = face;
+
+ to_xyz(i, j, face2, 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); // coord of pixel to bottom left
+ vi = floor(vf);
+ u2 = ui + 1; // coords of pixel to top right
+ v2 = vi + 1;
+ mu = uf - ui; // fraction of way across pixel
+ 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;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int erect2cubic(PanoramaContext *s,
+ const uint8_t *src, uint8_t *dst,
+ int width, int height,
+ int in_width, int in_height,
+ int in_linesize, int out_linesize,
+ struct XYRemap *remap)
+{
+ int i, j, edge = width / 4; // the length of each edge in pixels
+ int face, start, end;
+ float A, B, C, D;
+
+ for (i = 0; i < width; i++) {
+ face = i / edge; // 0 - back, 1 - left 2 - front, 3 - right
+ if (face == 2) {
+ start = 0;
+ end = edge * 3;
+ } else {
+ start = edge;
+ end = edge * 2;
+ }
+
+ for (j = start; j < end; j++) {
+ struct XYRemap *r = &remap[j * width + i];
+ 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];
+ dst[j * out_linesize + i] = A * r->a + B * r->b + C * r->c + D *
r->d;
+ }
+ }
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ PanoramaContext *s = ctx->priv;
+
+ if (s->in == EQUIRECTANGULAR && s->out == CUBIC) {
+ s->panorama = erect2cubic;
+ } else {
+ av_log(ctx, AV_LOG_ERROR, "Unsupported input and output
combination!\n");
+ }
+
+ 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;
+
+ 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],
+ s->inplanewidth[plane], s->inplaneheight[plane],
+ in->linesize[plane], out->linesize[plane],
+ s->remap[plane]);
+ }
+
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
+}
+
+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),
+ .init = init,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .priv_class = &panorama_class,
+};
--
1.9.1
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