mirror of
https://github.com/FFmpeg/FFmpeg.git
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373 lines
11 KiB
C
373 lines
11 KiB
C
/*
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* Copyright (c) 2013 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include "libswscale/swscale.h"
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static const char *const var_names[] = {
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"in_w", "iw",
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"in_h", "ih",
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"out_w", "ow",
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"out_h", "oh",
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"in",
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"on",
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"duration",
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"pduration",
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"time",
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"frame",
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"zoom",
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"pzoom",
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"x", "px",
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"y", "py",
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"a",
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"sar",
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"dar",
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"hsub",
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"vsub",
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NULL
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};
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enum var_name {
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VAR_IN_W, VAR_IW,
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VAR_IN_H, VAR_IH,
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VAR_OUT_W, VAR_OW,
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VAR_OUT_H, VAR_OH,
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VAR_IN,
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VAR_ON,
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VAR_DURATION,
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VAR_PDURATION,
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VAR_TIME,
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VAR_FRAME,
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VAR_ZOOM,
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VAR_PZOOM,
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VAR_X, VAR_PX,
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VAR_Y, VAR_PY,
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VAR_A,
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VAR_SAR,
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VAR_DAR,
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VAR_HSUB,
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VAR_VSUB,
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VARS_NB
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};
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typedef struct ZPcontext {
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const AVClass *class;
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char *zoom_expr_str;
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char *x_expr_str;
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char *y_expr_str;
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char *duration_expr_str;
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int w, h;
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double x, y;
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double prev_zoom;
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int prev_nb_frames;
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struct SwsContext *sws;
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int64_t frame_count;
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const AVPixFmtDescriptor *desc;
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AVFrame *in;
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double var_values[VARS_NB];
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int nb_frames;
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int current_frame;
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int finished;
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AVRational framerate;
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} ZPContext;
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#define OFFSET(x) offsetof(ZPContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption zoompan_options[] = {
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{ "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
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{ "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS },
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{ "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
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{ "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS },
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{ "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS },
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{ "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS },
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{ "fps", "set the output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, 0, INT_MAX, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(zoompan);
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static av_cold int init(AVFilterContext *ctx)
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{
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ZPContext *s = ctx->priv;
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s->prev_zoom = 1;
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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ZPContext *s = ctx->priv;
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outlink->w = s->w;
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outlink->h = s->h;
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outlink->time_base = av_inv_q(s->framerate);
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outlink->frame_rate = s->framerate;
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s->desc = av_pix_fmt_desc_get(outlink->format);
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return 0;
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}
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static int output_single_frame(AVFilterContext *ctx, AVFrame *in, double *var_values, int i,
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double *zoom, double *dx, double *dy)
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{
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ZPContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int64_t pts = s->frame_count;
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int k, x, y, w, h, ret = 0;
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uint8_t *input[4];
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int px[4], py[4];
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AVFrame *out;
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var_values[VAR_PX] = s->x;
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var_values[VAR_PY] = s->y;
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var_values[VAR_PZOOM] = s->prev_zoom;
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var_values[VAR_PDURATION] = s->prev_nb_frames;
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var_values[VAR_TIME] = pts * av_q2d(outlink->time_base);
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var_values[VAR_FRAME] = i;
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var_values[VAR_ON] = outlink->frame_count + 1;
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if ((ret = av_expr_parse_and_eval(zoom, s->zoom_expr_str,
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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return ret;
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*zoom = av_clipd(*zoom, 1, 10);
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var_values[VAR_ZOOM] = *zoom;
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w = in->width * (1.0 / *zoom);
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h = in->height * (1.0 / *zoom);
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if ((ret = av_expr_parse_and_eval(dx, s->x_expr_str,
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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return ret;
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x = *dx = av_clipd(*dx, 0, FFMAX(in->width - w, 0));
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var_values[VAR_X] = *dx;
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x &= ~((1 << s->desc->log2_chroma_w) - 1);
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if ((ret = av_expr_parse_and_eval(dy, s->y_expr_str,
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var_names, var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
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return ret;
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y = *dy = av_clipd(*dy, 0, FFMAX(in->height - h, 0));
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var_values[VAR_Y] = *dy;
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y &= ~((1 << s->desc->log2_chroma_h) - 1);
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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ret = AVERROR(ENOMEM);
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return ret;
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}
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px[1] = px[2] = AV_CEIL_RSHIFT(x, s->desc->log2_chroma_w);
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px[0] = px[3] = x;
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py[1] = py[2] = AV_CEIL_RSHIFT(y, s->desc->log2_chroma_h);
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py[0] = py[3] = y;
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s->sws = sws_alloc_context();
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if (!s->sws) {
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ret = AVERROR(ENOMEM);
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return ret;
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}
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for (k = 0; in->data[k]; k++)
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input[k] = in->data[k] + py[k] * in->linesize[k] + px[k];
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av_opt_set_int(s->sws, "srcw", w, 0);
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av_opt_set_int(s->sws, "srch", h, 0);
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av_opt_set_int(s->sws, "src_format", in->format, 0);
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av_opt_set_int(s->sws, "dstw", outlink->w, 0);
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av_opt_set_int(s->sws, "dsth", outlink->h, 0);
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av_opt_set_int(s->sws, "dst_format", outlink->format, 0);
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av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0);
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if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0)
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return ret;
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sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize);
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out->pts = pts;
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s->frame_count++;
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ret = ff_filter_frame(outlink, out);
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sws_freeContext(s->sws);
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s->sws = NULL;
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s->current_frame++;
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return ret;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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ZPContext *s = ctx->priv;
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double nb_frames;
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int ret;
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av_assert0(s->in == NULL);
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s->finished = 0;
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s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = in->width;
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s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = in->height;
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s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
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s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
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s->var_values[VAR_IN] = inlink->frame_count + 1;
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s->var_values[VAR_ON] = outlink->frame_count + 1;
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s->var_values[VAR_PX] = s->x;
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s->var_values[VAR_PY] = s->y;
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s->var_values[VAR_X] = 0;
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s->var_values[VAR_Y] = 0;
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s->var_values[VAR_PZOOM] = s->prev_zoom;
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s->var_values[VAR_ZOOM] = 1;
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s->var_values[VAR_PDURATION] = s->prev_nb_frames;
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s->var_values[VAR_A] = (double) in->width / in->height;
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s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
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(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
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s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
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s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
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s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
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if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
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var_names, s->var_values,
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_frame_free(&in);
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return ret;
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}
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s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
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s->in = in;
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return 0;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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ZPContext *s = ctx->priv;
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AVFrame *in = s->in;
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double zoom=-1, dx=-1, dy=-1;
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int ret = -1;
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if (in) {
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ret = output_single_frame(ctx, in, s->var_values, s->current_frame,
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&zoom, &dx, &dy);
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if (ret < 0)
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goto fail;
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}
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if (s->current_frame >= s->nb_frames) {
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if (dx != -1)
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s->x = dx;
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if (dy != -1)
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s->y = dy;
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if (zoom != -1)
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s->prev_zoom = zoom;
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s->prev_nb_frames = s->nb_frames;
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s->nb_frames = 0;
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s->current_frame = 0;
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av_frame_free(&s->in);
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s->finished = 1;
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ret = ff_request_frame(ctx->inputs[0]);
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}
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fail:
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sws_freeContext(s->sws);
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s->sws = NULL;
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return ret;
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}
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static int poll_frame(AVFilterLink *link)
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{
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ZPContext *s = link->src->priv;
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return s->nb_frames - s->current_frame;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ZPContext *s = ctx->priv;
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sws_freeContext(s->sws);
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s->sws = NULL;
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.needs_fifo = 1,
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},
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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.poll_frame = poll_frame,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_vf_zoompan = {
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.name = "zoompan",
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.description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."),
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.priv_size = sizeof(ZPContext),
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.priv_class = &zoompan_class,
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = inputs,
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.outputs = outputs,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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