Signed-off-by: Paul B Mahol <onemda(a)gmail.com>
---
doc/filters.texi | 83 +++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_zopan.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 386 insertions(+)
create mode 100644 libavfilter/vf_zopan.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 14692a2..9ddf26e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8195,6 +8195,89 @@ only deinterlace frames marked as interlaced
Default value is @code{all}.
@end table
+@section zopan
+
+This filter accepts the following options:
+
+@table @option
+@item z
+Set the zoom expression, Default is 1.
+
+@item x
+@item y
+Set the x and y expression. Default is 0.
+
+@item d
+Set the duration expression in number of frames.
+This sets for how many number of frames effect will last for
+single input image.
+
+@item s
+Set the output image size, default is 'hd720'.
+@end table
+
+Each expression can contain the following constants:
+
+@table @option
+@item in_w, iw
+Input width.
+
+@item in_h, ih
+Input height.
+
+@item out_w, ow
+Output width.
+
+@item out_h, oh
+Output height.
+
+@item in
+Input frame count.
+
+@item on
+Output frame count.
+
+@item x
+@item y
+Last calculated 'x' and 'y' position from 'x' and 'y' expression
+for current input frame.
+
+@item px
+@item py
+'x' and 'y' of last output frame of previous input frame or 0 when there was
+not yet such frame (first input frame).
+
+@item zoom
+Last calculated zoom from 'z' expression for current input frame.
+
+@item pzoom
+Last calculated zoom of last output frame of previous input frame.
+
+@item duration
+Number of output frames for current input frame. Calculated from 'd' expression
+for each input frame.
+
+@item pduration
+Number of output frames created for previous input frame.
+
+@item sar
+Sample aspect ratio
+
+@item dar
+Display aspect ratio
+
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Zoom-in up to 1.5 and pan at same time to some spot near centre of picture:
+@example
+zopan=z=min(zoom+0.0015\,1.5):d=700:x=if(gte(zoom\,1.5)\,x\,x+1/a):y=if(gte(zoom\,1.5)\,y\,y+1):s=640x360"
+@end example
+@end itemize
+
@c man end VIDEO FILTERS
@chapter Video Sources
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 3fcccf8..a108888 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -211,6 +211,7 @@ OBJS-$(CONFIG_VIGNETTE_FILTER) += vf_vignette.o
OBJS-$(CONFIG_W3FDIF_FILTER) += vf_w3fdif.o
OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o
OBJS-$(CONFIG_ZMQ_FILTER) += f_zmq.o
+OBJS-$(CONFIG_ZOPAN_FILTER) += vf_zopan.o
OBJS-$(CONFIG_CELLAUTO_FILTER) += vsrc_cellauto.o
OBJS-$(CONFIG_COLOR_FILTER) += vsrc_testsrc.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index a61ca0e..075503a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -206,6 +206,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(W3FDIF, w3fdif, vf);
REGISTER_FILTER(YADIF, yadif, vf);
REGISTER_FILTER(ZMQ, zmq, vf);
+ REGISTER_FILTER(ZOPAN, zopan, vf);
REGISTER_FILTER(CELLAUTO, cellauto, vsrc);
REGISTER_FILTER(COLOR, color, vsrc);
diff --git a/libavfilter/vf_zopan.c b/libavfilter/vf_zopan.c
new file mode 100644
index 0000000..6156192
--- /dev/null
+++ b/libavfilter/vf_zopan.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (c) 2013 Paul B Mahol
+ *
+ * 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/eval.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+#include "libswscale/swscale.h"
+
+static const char *const var_names[] = {
+ "in_w", "iw",
+ "in_h", "ih",
+ "out_w", "ow",
+ "out_h", "oh",
+ "in",
+ "on",
+ "duration",
+ "pduration",
+ "frame",
+ "zoom",
+ "pzoom",
+ "x", "px",
+ "y", "py",
+ "a",
+ "sar",
+ "dar",
+ "hsub",
+ "vsub",
+ NULL
+};
+
+enum var_name {
+ VAR_IN_W, VAR_IW,
+ VAR_IN_H, VAR_IH,
+ VAR_OUT_W, VAR_OW,
+ VAR_OUT_H, VAR_OH,
+ VAR_IN,
+ VAR_ON,
+ VAR_DURATION,
+ VAR_PDURATION,
+ VAR_FRAME,
+ VAR_ZOOM,
+ VAR_PZOOM,
+ VAR_X, VAR_PX,
+ VAR_Y, VAR_PY,
+ VAR_A,
+ VAR_SAR,
+ VAR_DAR,
+ VAR_HSUB,
+ VAR_VSUB,
+ VARS_NB
+};
+
+typedef struct ZPcontext {
+ const AVClass *class;
+ char *zoom_expr_str;
+ char *x_expr_str;
+ char *y_expr_str;
+ char *duration_expr_str;
+ int w, h;
+ double x, y;
+ double prev_zoom;
+ int prev_nb_frames;
+ struct SwsContext *sws;
+ int64_t frame_count;
+} ZPContext;
+
+#define OFFSET(x) offsetof(ZPContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+static const AVOption zopan_options[] = {
+ { "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
+ { "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
+ { "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
+ { "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
+ { "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(zopan);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ ZPContext *s = ctx->priv;
+
+ s->prev_zoom = 1;
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ ZPContext *s = ctx->priv;
+
+ outlink->w = s->w;
+ outlink->h = s->h;
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ ZPContext *s= ctx->priv;
+ double var_values[VARS_NB], nb_frames, zoom, dx, dy;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(in->format);
+ AVFrame *out;
+ int i, k, x, y, w, h, ret = 0;
+
+ var_values[VAR_IN_W] = var_values[VAR_IW] = in->width;
+ var_values[VAR_IN_H] = var_values[VAR_IH] = in->height;
+ var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w;
+ var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h;
+ var_values[VAR_IN] = inlink->frame_count + 1;
+ var_values[VAR_ON] = outlink->frame_count + 1;
+ var_values[VAR_PX] = s->x;
+ var_values[VAR_PY] = s->y;
+ var_values[VAR_X] = 0;
+ var_values[VAR_Y] = 0;
+ var_values[VAR_PZOOM] = s->prev_zoom;
+ var_values[VAR_ZOOM] = 1;
+ var_values[VAR_PDURATION] = s->prev_nb_frames;
+ var_values[VAR_A] = (double) in->width / in->height;
+ var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
+ (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
+ var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
+ var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
+ var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
+
+ if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+
+ var_values[VAR_DURATION] = nb_frames;
+ for (i = 0; i < nb_frames; i++) {
+ int px[4];
+ int py[4];
+
+ var_values[VAR_FRAME] = i;
+ var_values[VAR_ON] = outlink->frame_count + 1;
+ if ((ret = av_expr_parse_and_eval(&zoom, s->zoom_expr_str,
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+
+ zoom = av_clipd(zoom, 1, 10);
+ var_values[VAR_ZOOM] = zoom;
+ w = in->width * (1.0 / zoom);
+ h = in->height * (1.0 / zoom);
+
+ if ((ret = av_expr_parse_and_eval(&dx, s->x_expr_str,
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ x = dx = av_clipd(dx, 0, FFMAX(in->width - w, 0));
+ var_values[VAR_X] = dx;
+ x &= ~((1 << desc->log2_chroma_w) - 1);
+
+ if ((ret = av_expr_parse_and_eval(&dy, s->y_expr_str,
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ y = dy = av_clipd(dy, 0, FFMAX(in->height - h, 0));
+ var_values[VAR_Y] = dy;
+ y &= ~((1 << desc->log2_chroma_h) - 1);
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ px[1] = px[2] = FF_CEIL_RSHIFT(x, desc->log2_chroma_w);
+ px[0] = px[3] = x;
+
+ py[1] = py[2] = FF_CEIL_RSHIFT(y, desc->log2_chroma_h);
+ py[0] = py[3] = y;
+
+ s->sws = sws_alloc_context();
+ if (!s->sws) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ uint8_t *input[4];
+
+ for (k = 0; in->data[k]; k++)
+ input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
+
+ av_opt_set_int(s->sws, "srcw", w, 0);
+ av_opt_set_int(s->sws, "srch", h, 0);
+ av_opt_set_int(s->sws, "src_format", in->format, 0);
+ av_opt_set_int(s->sws, "dstw", outlink->w, 0);
+ av_opt_set_int(s->sws, "dsth", outlink->h, 0);
+ av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
+ av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
+
+ if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
+ goto fail;
+
+ sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
+
+ out->pts = av_rescale_q(in->pts, inlink->time_base,
+ outlink->time_base) + s->frame_count;
+ s->frame_count++;
+
+ ret = ff_filter_frame(outlink, out);
+ if (ret < 0)
+ break;
+
+ sws_freeContext(s->sws);
+ s->sws = NULL;
+ }
+
+ s->x = dx;
+ s->y = dy;
+ s->prev_zoom = zoom;
+ s->prev_nb_frames = nb_frames;
+
+fail:
+ sws_freeContext(s->sws);
+ s->sws = NULL;
+ av_frame_free(&in);
+ return ret;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
+ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
+ AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
+ 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_GRAY8,
+ AV_PIX_FMT_NONE
+ };
+
+
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+}
+
+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 avfilter_vf_zopan = {
+ .name = "zopan",
+ .description = NULL_IF_CONFIG_SMALL("Zoom & Pan."),
+ .priv_size = sizeof(ZPContext),
+ .priv_class = &zopan_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
--
1.7.11.2
