[FFmpeg-devel] [PATCH] Zoom & Pan filter
Paul B Mahol
onemda at gmail.com
Fri Jun 6 09:44:23 CEST 2014
On 10/31/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Thursday 2013-10-31 10:04:30 +0000, Paul B Mahol encoded:
>> Signed-off-by: Paul B Mahol <onemda at 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
>>
>> + at section zopan
>> +
>
> Short description missing.
Added.
>
>> +This filter accepts the following options:
>> +
>> + at table @option
>> + at item z
>
>> +Set the zoom expression, Default is 1.
>
> , -> .
Fixed.
>
> Also you could expand this and explain what's the meaning of the zoom
> expression.
>
>
>> +
>> + at item x
>> + at item y
>> +Set the x and y expression. Default is 0.
>
> Same, what are x and y?
>
>> +
>> + 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.
>
> Can't you use the enable expression for this?
>
>> +
>> + 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.
>
> Confusing.
>
>> +
>> + at item pduration
>> +Number of output frames created for previous input frame.
>> +
>> + at item sar
>> +Sample aspect ratio
>> +
>> + at item dar
>> +Display aspect ratio
>
> nit: not complete sentences, you can consistently drop capitalization
> and final point
>
>> +
>> + 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 centre of
>> picture:
>> + at 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"
>> + at end example
>> + at 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
>> +};
>
> time would also be useful
>
>> +
>> +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;
>
> nit: *s_ =
Fixed.
>
>> + 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;
>
> having a time variable seems useful
>
>> +
>> + 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;
>
> what about reusing the same context and updating it in case of changes?
>
>> +
>> + 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."),
>
> Apply Zoom & Pan effect.
Done.
I do not plan to work on other points.
So if you find filter useful at current stage it is
better to apply it now.
>
> [...]
> --
> FFmpeg = Fanciful & Freak Mastodontic Power EniGma
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