347 lines
11 KiB
C
347 lines
11 KiB
C
/*
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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/**
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* @file
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* scale video filter
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*/
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#include <stdio.h>
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#include <string.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 "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/internal.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libswscale/swscale.h"
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static const char *const var_names[] = {
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"PI",
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"PHI",
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"E",
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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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"a", "dar",
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"sar",
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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_PI,
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VAR_PHI,
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VAR_E,
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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_A, VAR_DAR,
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VAR_SAR,
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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 ScaleContext {
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const AVClass *class;
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struct SwsContext *sws; ///< software scaler context
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/**
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* New dimensions. Special values are:
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* 0 = original width/height
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* -1 = keep original aspect
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*/
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int w, h;
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unsigned int flags; ///sws flags
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int hsub, vsub; ///< chroma subsampling
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int slice_y; ///< top of current output slice
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int input_is_pal; ///< set to 1 if the input format is paletted
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char *w_expr; ///< width expression string
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char *h_expr; ///< height expression string
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char *flags_str;
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} ScaleContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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ScaleContext *scale = ctx->priv;
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if (scale->flags_str) {
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const AVClass *class = sws_get_class();
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const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
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AV_OPT_SEARCH_FAKE_OBJ);
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int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
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if (ret < 0)
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return ret;
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}
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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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ScaleContext *scale = ctx->priv;
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sws_freeContext(scale->sws);
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scale->sws = NULL;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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enum AVPixelFormat pix_fmt;
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int ret;
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if (ctx->inputs[0]) {
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const AVPixFmtDescriptor *desc = NULL;
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formats = NULL;
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while ((desc = av_pix_fmt_desc_next(desc))) {
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pix_fmt = av_pix_fmt_desc_get_id(desc);
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if ((sws_isSupportedInput(pix_fmt) ||
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sws_isSupportedEndiannessConversion(pix_fmt))
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&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
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ff_formats_unref(&formats);
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return ret;
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}
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}
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ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
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}
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if (ctx->outputs[0]) {
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const AVPixFmtDescriptor *desc = NULL;
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formats = NULL;
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while ((desc = av_pix_fmt_desc_next(desc))) {
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pix_fmt = av_pix_fmt_desc_get_id(desc);
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if ((sws_isSupportedOutput(pix_fmt) ||
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sws_isSupportedEndiannessConversion(pix_fmt))
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&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
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ff_formats_unref(&formats);
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return ret;
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}
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}
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ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
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}
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return 0;
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}
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static int config_props(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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AVFilterLink *inlink = outlink->src->inputs[0];
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ScaleContext *scale = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int64_t w, h;
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double var_values[VARS_NB], res;
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char *expr;
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int ret;
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var_values[VAR_PI] = M_PI;
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var_values[VAR_PHI] = M_PHI;
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var_values[VAR_E] = M_E;
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var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
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var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
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var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
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var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
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var_values[VAR_A] = (double) inlink->w / inlink->h;
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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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/* evaluate width and height */
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if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
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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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scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
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if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),
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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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scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
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/* evaluate again the width, as it may depend on the output height */
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if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
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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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scale->w = res;
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w = scale->w;
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h = scale->h;
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/* sanity check params */
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if (w < -1 || h < -1) {
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av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
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return AVERROR(EINVAL);
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}
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if (w == -1 && h == -1)
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scale->w = scale->h = 0;
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if (!(w = scale->w))
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w = inlink->w;
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if (!(h = scale->h))
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h = inlink->h;
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if (w == -1)
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w = av_rescale(h, inlink->w, inlink->h);
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if (h == -1)
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h = av_rescale(w, inlink->h, inlink->w);
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if (w > INT_MAX || h > INT_MAX ||
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(h * inlink->w) > INT_MAX ||
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(w * inlink->h) > INT_MAX)
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av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
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outlink->w = w;
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outlink->h = h;
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/* TODO: make algorithm configurable */
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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:0x%0x\n",
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inlink ->w, inlink ->h, av_get_pix_fmt_name(inlink->format),
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outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
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scale->flags);
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scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||
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desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
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if (scale->sws)
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sws_freeContext(scale->sws);
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if (inlink->w == outlink->w && inlink->h == outlink->h &&
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inlink->format == outlink->format)
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scale->sws = NULL;
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else {
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scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
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outlink->w, outlink->h, outlink->format,
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scale->flags, NULL, NULL, NULL);
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if (!scale->sws)
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return AVERROR(EINVAL);
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}
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if (inlink->sample_aspect_ratio.num)
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outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h*inlink->w,
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outlink->w*inlink->h},
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inlink->sample_aspect_ratio);
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else
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outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
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return 0;
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fail:
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av_log(NULL, AV_LOG_ERROR,
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"Error when evaluating the expression '%s'\n", expr);
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return ret;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *in)
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{
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ScaleContext *scale = link->dst->priv;
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AVFilterLink *outlink = link->dst->outputs[0];
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AVFrame *out;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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if (!scale->sws)
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return ff_filter_frame(outlink, in);
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scale->hsub = desc->log2_chroma_w;
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scale->vsub = desc->log2_chroma_h;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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out->width = outlink->w;
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out->height = outlink->h;
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av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
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(int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
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(int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
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INT_MAX);
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sws_scale(scale->sws, in->data, in->linesize, 0, in->height,
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out->data, out->linesize);
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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#define OFFSET(x) offsetof(ScaleContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{ "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str = "iw" }, .flags = FLAGS },
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{ "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str = "ih" }, .flags = FLAGS },
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{ "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
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{ NULL },
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};
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static const AVClass scale_class = {
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.class_name = "scale",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVFilterPad avfilter_vf_scale_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 avfilter_vf_scale_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_props,
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},
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{ NULL }
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};
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AVFilter ff_vf_scale = {
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.name = "scale",
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.description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.priv_size = sizeof(ScaleContext),
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.priv_class = &scale_class,
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.inputs = avfilter_vf_scale_inputs,
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.outputs = avfilter_vf_scale_outputs,
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};
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