489 lines
17 KiB
C
489 lines
17 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 <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/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/avassert.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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"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_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 {
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const AVClass *class;
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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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char *flags_str; ///sws flags string
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char *size_str;
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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 output_is_pal; ///< set to 1 if the output format is paletted
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int interlaced;
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char *w_expr; ///< width expression string
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char *h_expr; ///< height expression string
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} ScaleContext;
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#define OFFSET(x) offsetof(ScaleContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption scale_options[] = {
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{ "w", "set width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
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{ "width", "set width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
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{ "h", "set height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
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{ "height", "set height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
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{ "flags", "set libswscale flags", OFFSET(flags_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, INT_MAX, FLAGS },
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{ "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, 1, FLAGS },
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{ "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
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{ "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
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{ NULL },
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};
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AVFILTER_DEFINE_CLASS(scale);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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ScaleContext *scale = ctx->priv;
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static const char *shorthand[] = { "w", "h", NULL };
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int ret;
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const char *args0 = args;
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scale->class = &scale_class;
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av_opt_set_defaults(scale);
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if (args && (scale->size_str = av_get_token(&args, ":"))) {
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if (av_parse_video_size(&scale->w, &scale->h, scale->size_str) < 0) {
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av_freep(&scale->size_str);
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args = args0;
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} else if (*args)
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args++;
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}
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if ((ret = av_opt_set_from_string(scale, args, shorthand, "=", ":")) < 0)
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return ret;
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if (scale->size_str && (scale->w_expr || scale->h_expr)) {
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av_log(ctx, AV_LOG_ERROR,
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"Size and width/height expressions cannot be set at the same time.\n");
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return AVERROR(EINVAL);
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}
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if (scale->size_str) {
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char buf[32];
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if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid size '%s'\n", scale->size_str);
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return ret;
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}
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snprintf(buf, sizeof(buf)-1, "%d", scale->w);
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av_opt_set(scale, "w", buf, 0);
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snprintf(buf, sizeof(buf)-1, "%d", scale->h);
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av_opt_set(scale, "h", buf, 0);
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}
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if (!scale->w_expr)
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av_opt_set(scale, "w", "iw", 0);
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if (!scale->h_expr)
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av_opt_set(scale, "h", "ih", 0);
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av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
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scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
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scale->flags = SWS_BILINEAR;
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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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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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av_opt_free(scale);
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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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formats = NULL;
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for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
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if ( sws_isSupportedInput(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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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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formats = NULL;
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for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
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if ( (sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8)
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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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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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enum AVPixelFormat outfmt = outlink->format;
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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_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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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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scale->input_is_pal = desc->flags & PIX_FMT_PAL ||
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desc->flags & PIX_FMT_PSEUDOPAL;
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if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
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scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & PIX_FMT_PAL ||
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av_pix_fmt_desc_get(outfmt)->flags & PIX_FMT_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, outfmt,
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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, outfmt,
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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, outfmt,
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scale->flags, NULL, NULL, NULL);
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if (!scale->sws || !scale->isws[0] || !scale->isws[1])
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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, outlink->w * inlink->h}, 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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av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d fmt:%s sar:%d/%d flags:0x%0x\n",
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inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
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inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
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outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
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outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
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scale->flags);
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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"
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"Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
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expr, scale->w_expr, scale->h_expr);
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return ret;
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}
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static int 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, *for_next_filter;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
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char buf[32];
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int ret = 0;
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if( picref->video->w != link->w
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|| picref->video->h != link->h
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|| picref->format != link->format) {
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int ret;
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snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
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av_opt_set(scale, "w", buf, 0);
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snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
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av_opt_set(scale, "h", buf, 0);
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link->dst->inputs[0]->format = picref->format;
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link->dst->inputs[0]->w = picref->video->w;
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link->dst->inputs[0]->h = picref->video->h;
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if ((ret = config_props(outlink)) < 0)
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return ret;
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}
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if (!scale->sws) {
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outpicref = avfilter_ref_buffer(picref, ~0);
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if (!outpicref)
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return AVERROR(ENOMEM);
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return ff_start_frame(outlink, outpicref);
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}
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scale->hsub = desc->log2_chroma_w;
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scale->vsub = desc->log2_chroma_h;
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outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, outlink->w, outlink->h);
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if (!outpicref)
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return AVERROR(ENOMEM);
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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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if(scale->output_is_pal)
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avpriv_set_systematic_pal2((uint32_t*)outpicref->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
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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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for_next_filter = avfilter_ref_buffer(outpicref, ~0);
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if (for_next_filter)
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ret = ff_start_frame(outlink, for_next_filter);
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else
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ret = AVERROR(ENOMEM);
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if (ret < 0) {
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avfilter_unref_bufferp(&outpicref);
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return ret;
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}
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outlink->out_buf = outpicref;
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return 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];
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uint8_t *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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if(scale->output_is_pal)
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out[1] = out_buf->data[1];
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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 int 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, ret;
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if (!scale->sws) {
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return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
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}
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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%(2<<scale->vsub) == 0);
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out_h = scale_slice(link, scale->isws[0], y, (h+1)/2, 2, 0);
|
|
out_h+= scale_slice(link, scale->isws[1], y, h /2, 2, 1);
|
|
}else{
|
|
out_h = scale_slice(link, scale->sws, y, h, 1, 0);
|
|
}
|
|
|
|
if (slice_dir == -1)
|
|
scale->slice_y -= out_h;
|
|
ret = ff_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
|
|
if (slice_dir == 1)
|
|
scale->slice_y += out_h;
|
|
return ret;
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_scale_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.start_frame = start_frame,
|
|
.draw_slice = draw_slice,
|
|
.min_perms = AV_PERM_READ,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_scale_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_props,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_scale = {
|
|
.name = "scale",
|
|
.description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
|
|
|
|
.init = init,
|
|
.uninit = uninit,
|
|
|
|
.query_formats = query_formats,
|
|
|
|
.priv_size = sizeof(ScaleContext),
|
|
|
|
.inputs = avfilter_vf_scale_inputs,
|
|
.outputs = avfilter_vf_scale_outputs,
|
|
.priv_class = &scale_class,
|
|
};
|