mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
11 years ago
parent
0accf24b15
commit
4b6cb1cc69
7 changed files with 403 additions and 1 deletions
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/*
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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/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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} 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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{ 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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return 0; |
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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 var_values[VARS_NB], nb_frames, zoom, dx, dy; |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(in->format); |
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AVFrame *out; |
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int i, k, x, y, w, h, ret = 0; |
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var_values[VAR_IN_W] = var_values[VAR_IW] = in->width; |
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var_values[VAR_IN_H] = var_values[VAR_IH] = in->height; |
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var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w; |
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var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h; |
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var_values[VAR_IN] = inlink->frame_count + 1; |
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var_values[VAR_ON] = outlink->frame_count + 1; |
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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_X] = 0; |
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var_values[VAR_Y] = 0; |
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var_values[VAR_PZOOM] = s->prev_zoom; |
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var_values[VAR_ZOOM] = 1; |
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var_values[VAR_PDURATION] = s->prev_nb_frames; |
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var_values[VAR_A] = (double) in->width / in->height; |
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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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var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; |
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var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; |
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var_values[VAR_VSUB] = 1 << 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, var_values, |
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NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
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goto fail; |
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var_values[VAR_DURATION] = nb_frames; |
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for (i = 0; i < nb_frames; i++) { |
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int px[4]; |
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int py[4]; |
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int64_t pts = av_rescale_q(in->pts, inlink->time_base, |
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outlink->time_base) + s->frame_count; |
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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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goto fail; |
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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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goto fail; |
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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 << 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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goto fail; |
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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 << 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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goto fail; |
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} |
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px[1] = px[2] = FF_CEIL_RSHIFT(x, desc->log2_chroma_w); |
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px[0] = px[3] = x; |
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py[1] = py[2] = FF_CEIL_RSHIFT(y, 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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goto fail; |
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} |
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uint8_t *input[4]; |
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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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goto fail; |
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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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if (ret < 0) |
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break; |
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sws_freeContext(s->sws); |
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s->sws = NULL; |
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} |
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s->x = dx; |
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s->y = dy; |
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s->prev_zoom = zoom; |
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s->prev_nb_frames = nb_frames; |
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fail: |
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sws_freeContext(s->sws); |
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s->sws = NULL; |
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av_frame_free(&in); |
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return ret; |
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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_GRAY8, |
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AV_PIX_FMT_NONE |
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}; |
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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return 0; |
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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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}, |
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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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}, |
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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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