/*
- * copyright (c) 2007 Bobby Bingham
+ * Copyright (c) 2007 Bobby Bingham
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* scale video filter
*/
+#include <stdio.h>
+#include <string.h>
+
#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/internal.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libswscale/swscale.h"
+static const char *const var_names[] = {
+ "PI",
+ "PHI",
+ "E",
+ "in_w", "iw",
+ "in_h", "ih",
+ "out_w", "ow",
+ "out_h", "oh",
+ "a", "dar",
+ "sar",
+ "hsub",
+ "vsub",
+ NULL
+};
+
+enum var_name {
+ VAR_PI,
+ VAR_PHI,
+ VAR_E,
+ VAR_IN_W, VAR_IW,
+ VAR_IN_H, VAR_IH,
+ VAR_OUT_W, VAR_OW,
+ VAR_OUT_H, VAR_OH,
+ VAR_A, VAR_DAR,
+ VAR_SAR,
+ VAR_HSUB,
+ VAR_VSUB,
+ VARS_NB
+};
+
typedef struct {
struct SwsContext *sws; ///< software scaler context
int hsub, vsub; ///< chroma subsampling
int slice_y; ///< top of current output slice
int input_is_pal; ///< set to 1 if the input format is paletted
+
+ char w_expr[256]; ///< width expression string
+ char h_expr[256]; ///< height expression string
} ScaleContext;
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+static av_cold int init(AVFilterContext *ctx, const char *args)
{
ScaleContext *scale = ctx->priv;
+ const char *p;
- scale->flags = SWS_BILINEAR;
- if (args){
- sscanf(args, "%d:%d", &scale->w, &scale->h);
- sscanf(strstr(args,"flags="), "flags=%i", &scale->flags);
- }
+ av_strlcpy(scale->w_expr, "iw", sizeof(scale->w_expr));
+ av_strlcpy(scale->h_expr, "ih", sizeof(scale->h_expr));
- /* sanity check params */
- if (scale->w < -1 || scale->h < -1) {
- av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
- return -1;
+ scale->flags = SWS_BILINEAR;
+ if (args) {
+ sscanf(args, "%255[^:]:%255[^:]", scale->w_expr, scale->h_expr);
+ p = strstr(args,"flags=");
+ if (p) {
+ const AVClass *class = sws_get_class();
+ const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
+ AV_OPT_SEARCH_FAKE_OBJ);
+ int ret = av_opt_eval_flags(&class, o, p + 6, &scale->flags);
+
+ if (ret < 0)
+ return ret;
+ }
}
- if (scale->w == -1 && scale->h == -1)
- scale->w = scale->h = 0;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats;
- enum PixelFormat pix_fmt;
+ enum AVPixelFormat pix_fmt;
int ret;
if (ctx->inputs[0]) {
formats = NULL;
- for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
+ for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
if ( sws_isSupportedInput(pix_fmt)
- && (ret = avfilter_add_colorspace(&formats, pix_fmt)) < 0) {
- avfilter_formats_unref(&formats);
+ && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
+ ff_formats_unref(&formats);
return ret;
}
- avfilter_formats_ref(formats, &ctx->inputs[0]->out_formats);
+ ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
}
if (ctx->outputs[0]) {
formats = NULL;
- for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
+ for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
if ( sws_isSupportedOutput(pix_fmt)
- && (ret = avfilter_add_colorspace(&formats, pix_fmt)) < 0) {
- avfilter_formats_unref(&formats);
+ && (ret = ff_add_format(&formats, pix_fmt)) < 0) {
+ ff_formats_unref(&formats);
return ret;
}
- avfilter_formats_ref(formats, &ctx->outputs[0]->in_formats);
+ ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
}
return 0;
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = outlink->src->inputs[0];
ScaleContext *scale = ctx->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int64_t w, h;
+ double var_values[VARS_NB], res;
+ char *expr;
+ int ret;
+
+ var_values[VAR_PI] = M_PI;
+ var_values[VAR_PHI] = M_PHI;
+ var_values[VAR_E] = M_E;
+ var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
+ var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
+ var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
+ var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
+ var_values[VAR_DAR] = var_values[VAR_A] = (double) inlink->w / inlink->h;
+ var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
+ (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
+ var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
+ var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
+
+ /* evaluate width and height */
+ av_expr_parse_and_eval(&res, (expr = scale->w_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx);
+ scale->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
+ if ((ret = av_expr_parse_and_eval(&res, (expr = scale->h_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ scale->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
+ /* evaluate again the width, as it may depend on the output height */
+ if ((ret = av_expr_parse_and_eval(&res, (expr = scale->w_expr),
+ var_names, var_values,
+ NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
+ goto fail;
+ scale->w = res;
+
+ w = scale->w;
+ h = scale->h;
+
+ /* sanity check params */
+ if (w < -1 || h < -1) {
+ av_log(ctx, AV_LOG_ERROR, "Size values less than -1 are not acceptable.\n");
+ return AVERROR(EINVAL);
+ }
+ if (w == -1 && h == -1)
+ scale->w = scale->h = 0;
if (!(w = scale->w))
w = inlink->w;
outlink->h = h;
/* TODO: make algorithm configurable */
- scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
- outlink->w, outlink->h, outlink->format,
- scale->flags, NULL, NULL, NULL);
+ av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:0x%0x\n",
+ inlink ->w, inlink ->h, av_get_pix_fmt_name(inlink->format),
+ outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
+ scale->flags);
+
+ scale->input_is_pal = desc->flags & PIX_FMT_PAL ||
+ desc->flags & PIX_FMT_PSEUDOPAL;
+
+ if (scale->sws)
+ sws_freeContext(scale->sws);
+ if (inlink->w == outlink->w && inlink->h == outlink->h &&
+ inlink->format == outlink->format)
+ scale->sws = NULL;
+ else {
+ scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
+ outlink->w, outlink->h, outlink->format,
+ scale->flags, NULL, NULL, NULL);
+ if (!scale->sws)
+ return AVERROR(EINVAL);
+ }
- av_log(ctx, AV_LOG_INFO, "w:%d h:%d fmt:%s\n",
- outlink->w, outlink->h, av_pix_fmt_descriptors[outlink->format].name);
- scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL;
+ if (inlink->sample_aspect_ratio.num)
+ outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h*inlink->w,
+ outlink->w*inlink->h},
+ inlink->sample_aspect_ratio);
+ else
+ outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
- return !scale->sws;
+ return 0;
+
+fail:
+ av_log(NULL, AV_LOG_ERROR,
+ "Error when evaluating the expression '%s'\n", expr);
+ return ret;
}
-static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+static int filter_frame(AVFilterLink *link, AVFrame *in)
{
ScaleContext *scale = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[0];
- AVFilterPicRef *outpicref;
+ AVFrame *out;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
+
+ if (!scale->sws)
+ return ff_filter_frame(outlink, in);
+
+ scale->hsub = desc->log2_chroma_w;
+ scale->vsub = desc->log2_chroma_h;
- scale->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
- scale->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out) {
+ av_frame_free(&in);
+ return AVERROR(ENOMEM);
+ }
- outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
- outpicref->pts = picref->pts;
- outpicref->pos = picref->pos;
- outlink->outpic = outpicref;
+ av_frame_copy_props(out, in);
+ out->width = outlink->w;
+ out->height = outlink->h;
- av_reduce(&outpicref->pixel_aspect.num, &outpicref->pixel_aspect.den,
- (int64_t)picref->pixel_aspect.num * outlink->h * link->w,
- (int64_t)picref->pixel_aspect.den * outlink->w * link->h,
+ av_reduce(&out->sample_aspect_ratio.num, &out->sample_aspect_ratio.den,
+ (int64_t)in->sample_aspect_ratio.num * outlink->h * link->w,
+ (int64_t)in->sample_aspect_ratio.den * outlink->w * link->h,
INT_MAX);
- scale->slice_y = 0;
- avfilter_start_frame(outlink, avfilter_ref_pic(outpicref, ~0));
-}
+ sws_scale(scale->sws, in->data, in->linesize, 0, in->height,
+ out->data, out->linesize);
-static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
-{
- ScaleContext *scale = link->dst->priv;
- int out_h;
- AVFilterPicRef *cur_pic = link->cur_pic;
- uint8_t *data[4];
-
- if (scale->slice_y == 0 && slice_dir == -1)
- scale->slice_y = link->dst->outputs[0]->h;
-
- data[0] = cur_pic->data[0] + y * cur_pic->linesize[0];
- data[1] = scale->input_is_pal ?
- cur_pic->data[1] :
- cur_pic->data[1] + (y>>scale->vsub) * cur_pic->linesize[1];
- data[2] = cur_pic->data[2] + (y>>scale->vsub) * cur_pic->linesize[2];
- data[3] = cur_pic->data[3] + y * cur_pic->linesize[3];
-
- out_h = sws_scale(scale->sws, data, cur_pic->linesize, y, h,
- link->dst->outputs[0]->outpic->data,
- link->dst->outputs[0]->outpic->linesize);
-
- if (slice_dir == -1)
- scale->slice_y -= out_h;
- avfilter_draw_slice(link->dst->outputs[0], scale->slice_y, out_h, slice_dir);
- if (slice_dir == 1)
- scale->slice_y += out_h;
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
}
+static const AVFilterPad avfilter_vf_scale_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ },
+ { 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 = "Scale the input video to width:height size and/or convert the image format.",
+ .description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(ScaleContext),
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .start_frame = start_frame,
- .draw_slice = draw_slice,
- .min_perms = AV_PERM_READ, },
- { .name = NULL}},
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = config_props, },
- { .name = NULL}},
+ .inputs = avfilter_vf_scale_inputs,
+ .outputs = avfilter_vf_scale_outputs,
};
projects / ffmpeg / blobdiff