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https://github.com/xenia-project/FFmpeg.git
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f97905e61d
This currently only occurrs in vsrc_buffer in case of mid-stream size/format change. Fix trac issue #124.
338 lines
11 KiB
C
338 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 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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/**
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* @file
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* scale video filter
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*/
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#include "avfilter.h"
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/avassert.h"
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#include "libswscale/swscale.h"
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static const char *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",
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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,
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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 {
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struct SwsContext *sws; ///< software scaler context
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struct SwsContext *isws[2]; ///< software scaler context for interlaced material
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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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int interlaced;
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char w_expr[256]; ///< width expression string
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char h_expr[256]; ///< height expression string
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} ScaleContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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ScaleContext *scale = ctx->priv;
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const char *p;
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av_strlcpy(scale->w_expr, "iw", sizeof(scale->w_expr));
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av_strlcpy(scale->h_expr, "ih", sizeof(scale->h_expr));
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scale->flags = SWS_BILINEAR;
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if (args) {
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sscanf(args, "%255[^:]:%255[^:]", scale->w_expr, scale->h_expr);
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p = strstr(args,"flags=");
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if (p) scale->flags = strtoul(p+6, NULL, 0);
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if(strstr(args,"interl=1")){
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scale->interlaced=1;
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}else if(strstr(args,"interl=-1"))
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scale->interlaced=-1;
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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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sws_freeContext(scale->isws[0]);
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sws_freeContext(scale->isws[1]);
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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 PixelFormat pix_fmt;
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int ret;
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if (ctx->inputs[0]) {
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formats = NULL;
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for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
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if ( sws_isSupportedInput(pix_fmt)
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&& (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
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avfilter_formats_unref(&formats);
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return ret;
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}
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avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
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}
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if (ctx->outputs[0]) {
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formats = NULL;
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for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
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if ( sws_isSupportedOutput(pix_fmt)
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&& (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
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avfilter_formats_unref(&formats);
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return ret;
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}
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avfilter_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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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] = (float) inlink->w / inlink->h;
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var_values[VAR_HSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
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var_values[VAR_VSUB] = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
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/* evaluate width and height */
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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);
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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_INFO, "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_pix_fmt_descriptors[ inlink->format].name,
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outlink->w, outlink->h, av_pix_fmt_descriptors[outlink->format].name,
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scale->flags);
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scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL;
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if (scale->sws)
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sws_freeContext(scale->sws);
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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->isws[0])
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sws_freeContext(scale->isws[0]);
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scale->isws[0] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
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outlink->w, outlink->h/2, outlink->format,
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scale->flags, NULL, NULL, NULL);
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if (scale->isws[1])
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sws_freeContext(scale->isws[1]);
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scale->isws[1] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
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outlink->w, outlink->h/2, 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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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 void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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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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AVFilterBufferRef *outpicref;
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scale->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
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scale->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
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outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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avfilter_copy_buffer_ref_props(outpicref, picref);
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outpicref->video->w = outlink->w;
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outpicref->video->h = outlink->h;
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outlink->out_buf = outpicref;
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av_reduce(&outpicref->video->sample_aspect_ratio.num, &outpicref->video->sample_aspect_ratio.den,
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(int64_t)picref->video->sample_aspect_ratio.num * outlink->h * link->w,
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(int64_t)picref->video->sample_aspect_ratio.den * outlink->w * link->h,
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INT_MAX);
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scale->slice_y = 0;
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avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
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}
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static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h, int mul, int field)
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{
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ScaleContext *scale = link->dst->priv;
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AVFilterBufferRef *cur_pic = link->cur_buf;
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AVFilterBufferRef *out_buf = link->dst->outputs[0]->out_buf;
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const uint8_t *in[4], *out[4];
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int in_stride[4],out_stride[4];
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int i;
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for(i=0; i<4; i++){
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int vsub= ((i+1)&2) ? scale->vsub : 0;
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in_stride[i] = cur_pic->linesize[i] * mul;
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out_stride[i] = out_buf->linesize[i] * mul;
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in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
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out[i] = out_buf->data[i] + field * out_buf->linesize[i];
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}
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if(scale->input_is_pal){
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in[1] = cur_pic->data[1];
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out[1] = out_buf->data[1];
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}
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return sws_scale(sws, in, in_stride, y/mul, h,
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out,out_stride);
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}
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static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
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{
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ScaleContext *scale = link->dst->priv;
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int out_h;
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if (scale->slice_y == 0 && slice_dir == -1)
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scale->slice_y = link->dst->outputs[0]->h;
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if(scale->interlaced>0 || (scale->interlaced<0 && link->cur_buf->video->interlaced)){
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av_assert0(y%4 == 0);
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out_h = scale_slice(link, scale->isws[0], y, (h+1)/2, 2, 0);
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out_h+= scale_slice(link, scale->isws[1], y, h /2, 2, 1);
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}else{
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out_h = scale_slice(link, scale->sws, y, h, 1, 0);
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}
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if (slice_dir == -1)
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scale->slice_y -= out_h;
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avfilter_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
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if (slice_dir == 1)
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scale->slice_y += out_h;
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}
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AVFilter avfilter_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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.inputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.start_frame = start_frame,
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.draw_slice = draw_slice,
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.min_perms = AV_PERM_READ, },
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{ .name = NULL}},
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.outputs = (AVFilterPad[]) {{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props, },
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{ .name = NULL}},
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};
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