[FFmpeg-cvslog] Zoom & Pan filter
Paul B Mahol
git at videolan.org
Mon Jun 9 14:44:31 CEST 2014
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Mon Sep 16 15:31:15 2013 +0000| [4b6cb1cc69010cd11b2370d81ef11fd454bc5d98] | committer: Paul B Mahol
Zoom & Pan filter
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4b6cb1cc69010cd11b2370d81ef11fd454bc5d98
---
Changelog | 1 +
configure | 1 +
doc/filters.texi | 88 +++++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/version.h | 2 +-
libavfilter/vf_zoompan.c | 310 ++++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 403 insertions(+), 1 deletion(-)
diff --git a/Changelog b/Changelog
index 7f3704e..56a5ddf 100644
--- a/Changelog
+++ b/Changelog
@@ -27,6 +27,7 @@ version <next>:
- display matrix export and rotation api
- WebVTT encoder
- showcqt multimedia filter
+- zoompan filter
version 2.2:
diff --git a/configure b/configure
index 76edb6b..5f53af1 100755
--- a/configure
+++ b/configure
@@ -2540,6 +2540,7 @@ pixfmts_super2xsai_test_deps="super2xsai_filter"
tinterlace_merge_test_deps="tinterlace_filter"
tinterlace_pad_test_deps="tinterlace_filter"
zmq_filter_deps="libzmq"
+zoompan_filter_deps="swscale"
# examples
avio_reading="avformat avcodec avutil"
diff --git a/doc/filters.texi b/doc/filters.texi
index 9dc97d7..d8ed7f7 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8680,6 +8680,94 @@ Only deinterlace frames marked as interlaced.
The default value is @code{all}.
@end table
+ at section zoompan
+
+Apply Zoom & Pan effect.
+
+This filter accepts the following options:
+
+ at table @option
+ at item zoom, z
+Set the zoom expression. Default is 1.
+
+ at item x
+ at item y
+Set the x and y expression. Default is 0.
+
+ at 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.
+
+ at item s
+Set the output image size, default is 'hd720'.
+ at end table
+
+Each expression can contain the following constants:
+
+ at table @option
+ at item in_w, iw
+Input width.
+
+ at item in_h, ih
+Input height.
+
+ at item out_w, ow
+Output width.
+
+ at item out_h, oh
+Output height.
+
+ at item in
+Input frame count.
+
+ at item on
+Output frame count.
+
+ at item x
+ at item y
+Last calculated 'x' and 'y' position from 'x' and 'y' expression
+for current input frame.
+
+ at item px
+ at 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).
+
+ at item zoom
+Last calculated zoom from 'z' expression for current input frame.
+
+ at item pzoom
+Last calculated zoom of last output frame of previous input frame.
+
+ at item duration
+Number of output frames for current input frame. Calculated from 'd' expression
+for each input frame.
+
+ at item pduration
+number of output frames created for previous input frame
+
+ at item a
+Rational number: input width / input height
+
+ at item sar
+sample aspect ratio
+
+ at item dar
+display aspect ratio
+
+ at end table
+
+ at subsection Examples
+
+ at itemize
+ at item
+Zoom-in up to 1.5 and pan at same time to some spot near center of picture:
+ at example
+zoompan=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"
+ at end example
+ at end itemize
+
@c man end VIDEO FILTERS
@chapter Video Sources
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8ba0312..9552b9f4 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -195,6 +195,7 @@ 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-$(CONFIG_ZOOMPAN_FILTER) += vf_zoompan.o
OBJS-$(CONFIG_CELLAUTO_FILTER) += vsrc_cellauto.o
OBJS-$(CONFIG_COLOR_FILTER) += vsrc_testsrc.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 55d505a..9ef4f67 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -212,6 +212,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(W3FDIF, w3fdif, vf);
REGISTER_FILTER(YADIF, yadif, vf);
REGISTER_FILTER(ZMQ, zmq, vf);
+ REGISTER_FILTER(ZOOMPAN, zoompan, vf);
REGISTER_FILTER(CELLAUTO, cellauto, vsrc);
REGISTER_FILTER(COLOR, color, vsrc);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index d7acf72..80a7b66 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 4
-#define LIBAVFILTER_VERSION_MINOR 6
+#define LIBAVFILTER_VERSION_MINOR 7
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
diff --git a/libavfilter/vf_zoompan.c b/libavfilter/vf_zoompan.c
new file mode 100644
index 0000000..9ac925c
--- /dev/null
+++ b/libavfilter/vf_zoompan.c
@@ -0,0 +1,310 @@
+/*
+ * 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",
+ "time",
+ "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_TIME,
+ 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 zoompan_options[] = {
+ { "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
+ { "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(zoompan);
+
+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];
+ int64_t pts = av_rescale_q(in->pts, inlink->time_base,
+ outlink->time_base) + s->frame_count;
+
+ var_values[VAR_TIME] = pts * av_q2d(outlink->time_base);
+ 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 = pts;
+ 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)
+{
+ ZPContext *s = ctx->priv;
+
+ sws_freeContext(s->sws);
+ s->sws = NULL;
+}
+
+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_zoompan = {
+ .name = "zoompan",
+ .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
+ .priv_size = sizeof(ZPContext),
+ .priv_class = &zoompan_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
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