2009-11-11 23:50:21 +00:00
|
|
|
/*
|
2010-11-28 10:22:58 +00:00
|
|
|
* Copyright (c) 2007 Bobby Bingham
|
2009-11-11 23:50:21 +00:00
|
|
|
*
|
2011-03-18 17:35:10 +00:00
|
|
|
* This file is part of Libav.
|
2009-11-11 23:50:21 +00:00
|
|
|
*
|
2011-03-18 17:35:10 +00:00
|
|
|
* Libav is free software; you can redistribute it and/or
|
2009-11-11 23:50:21 +00:00
|
|
|
* 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.
|
|
|
|
*
|
2011-03-18 17:35:10 +00:00
|
|
|
* Libav is distributed in the hope that it will be useful,
|
2009-11-11 23:50:21 +00:00
|
|
|
* 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
|
2011-03-18 17:35:10 +00:00
|
|
|
* License along with Libav; if not, write to the Free Software
|
2009-11-11 23:50:21 +00:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
2010-04-20 14:45:34 +00:00
|
|
|
* @file
|
2009-11-11 23:50:21 +00:00
|
|
|
* scale video filter
|
|
|
|
*/
|
|
|
|
|
2012-08-06 13:49:32 +00:00
|
|
|
#include <stdio.h>
|
|
|
|
#include <string.h>
|
|
|
|
|
2009-11-11 23:50:21 +00:00
|
|
|
#include "avfilter.h"
|
2012-05-30 08:12:55 +00:00
|
|
|
#include "formats.h"
|
2012-06-12 18:12:42 +00:00
|
|
|
#include "internal.h"
|
2012-05-30 09:20:32 +00:00
|
|
|
#include "video.h"
|
2011-03-27 20:58:08 +00:00
|
|
|
#include "libavutil/avstring.h"
|
|
|
|
#include "libavutil/eval.h"
|
2012-08-06 13:49:32 +00:00
|
|
|
#include "libavutil/internal.h"
|
2011-06-04 11:58:23 +00:00
|
|
|
#include "libavutil/mathematics.h"
|
2012-04-09 04:05:50 +00:00
|
|
|
#include "libavutil/opt.h"
|
2010-01-31 16:33:29 +00:00
|
|
|
#include "libavutil/pixdesc.h"
|
2009-11-11 23:50:21 +00:00
|
|
|
#include "libswscale/swscale.h"
|
|
|
|
|
2012-02-20 08:42:33 +00:00
|
|
|
static const char *const var_names[] = {
|
2011-03-27 20:58:08 +00:00
|
|
|
"PI",
|
|
|
|
"PHI",
|
|
|
|
"E",
|
|
|
|
"in_w", "iw",
|
|
|
|
"in_h", "ih",
|
|
|
|
"out_w", "ow",
|
|
|
|
"out_h", "oh",
|
2011-07-02 15:27:31 +00:00
|
|
|
"a", "dar",
|
|
|
|
"sar",
|
2011-03-27 20:58:08 +00:00
|
|
|
"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,
|
2011-07-02 15:27:31 +00:00
|
|
|
VAR_A, VAR_DAR,
|
|
|
|
VAR_SAR,
|
2011-03-27 20:58:08 +00:00
|
|
|
VAR_HSUB,
|
|
|
|
VAR_VSUB,
|
|
|
|
VARS_NB
|
|
|
|
};
|
|
|
|
|
2014-04-11 09:54:15 +00:00
|
|
|
typedef struct ScaleContext {
|
2013-02-25 20:21:29 +00:00
|
|
|
const AVClass *class;
|
2009-11-11 23:50:21 +00:00
|
|
|
struct SwsContext *sws; ///< software scaler context
|
|
|
|
|
|
|
|
/**
|
|
|
|
* New dimensions. Special values are:
|
|
|
|
* 0 = original width/height
|
|
|
|
* -1 = keep original aspect
|
|
|
|
*/
|
|
|
|
int w, h;
|
2010-05-07 09:20:45 +00:00
|
|
|
unsigned int flags; ///sws flags
|
2009-11-11 23:50:21 +00:00
|
|
|
|
|
|
|
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
|
2011-03-27 20:58:08 +00:00
|
|
|
|
2013-02-25 20:21:29 +00:00
|
|
|
char *w_expr; ///< width expression string
|
|
|
|
char *h_expr; ///< height expression string
|
|
|
|
char *flags_str;
|
2009-11-11 23:50:21 +00:00
|
|
|
} ScaleContext;
|
|
|
|
|
2013-03-13 07:26:39 +00:00
|
|
|
static av_cold int init(AVFilterContext *ctx)
|
2009-11-11 23:50:21 +00:00
|
|
|
{
|
|
|
|
ScaleContext *scale = ctx->priv;
|
2013-02-25 20:21:29 +00:00
|
|
|
|
|
|
|
if (scale->flags_str) {
|
|
|
|
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, scale->flags_str, &scale->flags);
|
|
|
|
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2010-05-07 09:20:45 +00:00
|
|
|
}
|
2009-11-11 23:50:21 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
|
|
{
|
|
|
|
ScaleContext *scale = ctx->priv;
|
|
|
|
sws_freeContext(scale->sws);
|
|
|
|
scale->sws = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
|
|
{
|
|
|
|
AVFilterFormats *formats;
|
2012-10-06 10:10:34 +00:00
|
|
|
enum AVPixelFormat pix_fmt;
|
2010-01-08 23:48:32 +00:00
|
|
|
int ret;
|
2009-11-11 23:50:21 +00:00
|
|
|
|
|
|
|
if (ctx->inputs[0]) {
|
2014-05-24 09:15:15 +00:00
|
|
|
const AVPixFmtDescriptor *desc = NULL;
|
2010-01-08 23:48:32 +00:00
|
|
|
formats = NULL;
|
2014-05-24 09:15:15 +00:00
|
|
|
while ((desc = av_pix_fmt_desc_next(desc))) {
|
|
|
|
pix_fmt = av_pix_fmt_desc_get_id(desc);
|
2013-04-26 12:49:43 +00:00
|
|
|
if ((sws_isSupportedInput(pix_fmt) ||
|
|
|
|
sws_isSupportedEndiannessConversion(pix_fmt))
|
2012-05-30 08:12:55 +00:00
|
|
|
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
|
|
|
|
ff_formats_unref(&formats);
|
2010-01-08 23:48:32 +00:00
|
|
|
return ret;
|
|
|
|
}
|
2014-05-24 09:15:15 +00:00
|
|
|
}
|
2012-05-30 08:12:55 +00:00
|
|
|
ff_formats_ref(formats, &ctx->inputs[0]->out_formats);
|
2009-11-11 23:50:21 +00:00
|
|
|
}
|
|
|
|
if (ctx->outputs[0]) {
|
2014-05-24 09:15:15 +00:00
|
|
|
const AVPixFmtDescriptor *desc = NULL;
|
2010-01-08 23:48:32 +00:00
|
|
|
formats = NULL;
|
2014-05-24 09:15:15 +00:00
|
|
|
while ((desc = av_pix_fmt_desc_next(desc))) {
|
|
|
|
pix_fmt = av_pix_fmt_desc_get_id(desc);
|
2013-04-26 12:49:43 +00:00
|
|
|
if ((sws_isSupportedOutput(pix_fmt) ||
|
|
|
|
sws_isSupportedEndiannessConversion(pix_fmt))
|
2012-05-30 08:12:55 +00:00
|
|
|
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
|
|
|
|
ff_formats_unref(&formats);
|
2010-01-08 23:48:32 +00:00
|
|
|
return ret;
|
|
|
|
}
|
2014-05-24 09:15:15 +00:00
|
|
|
}
|
2012-05-30 08:12:55 +00:00
|
|
|
ff_formats_ref(formats, &ctx->outputs[0]->in_formats);
|
2009-11-11 23:50:21 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int config_props(AVFilterLink *outlink)
|
|
|
|
{
|
|
|
|
AVFilterContext *ctx = outlink->src;
|
|
|
|
AVFilterLink *inlink = outlink->src->inputs[0];
|
|
|
|
ScaleContext *scale = ctx->priv;
|
2012-10-06 11:29:37 +00:00
|
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
|
2009-11-11 23:50:21 +00:00
|
|
|
int64_t w, h;
|
2011-03-27 20:58:08 +00:00
|
|
|
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;
|
2013-11-02 10:57:25 +00:00
|
|
|
var_values[VAR_A] = (double) inlink->w / inlink->h;
|
2011-07-02 15:27:31 +00:00
|
|
|
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
|
2012-10-05 12:45:30 +00:00
|
|
|
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
|
2013-11-02 10:57:25 +00:00
|
|
|
var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
|
2012-10-06 11:29:37 +00:00
|
|
|
var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
|
|
|
|
var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
|
2011-03-27 20:58:08 +00:00
|
|
|
|
|
|
|
/* evaluate width and height */
|
2014-12-17 14:19:43 +00:00
|
|
|
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;
|
2011-03-27 20:58:08 +00:00
|
|
|
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;
|
2009-11-11 23:50:21 +00:00
|
|
|
|
|
|
|
if (!(w = scale->w))
|
|
|
|
w = inlink->w;
|
|
|
|
if (!(h = scale->h))
|
|
|
|
h = inlink->h;
|
|
|
|
if (w == -1)
|
|
|
|
w = av_rescale(h, inlink->w, inlink->h);
|
|
|
|
if (h == -1)
|
|
|
|
h = av_rescale(w, inlink->h, inlink->w);
|
|
|
|
|
|
|
|
if (w > INT_MAX || h > INT_MAX ||
|
|
|
|
(h * inlink->w) > INT_MAX ||
|
|
|
|
(w * inlink->h) > INT_MAX)
|
|
|
|
av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
|
|
|
|
|
|
|
|
outlink->w = w;
|
|
|
|
outlink->h = h;
|
|
|
|
|
|
|
|
/* TODO: make algorithm configurable */
|
2012-06-25 04:31:38 +00:00
|
|
|
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:0x%0x\n",
|
2012-10-06 11:29:37 +00:00
|
|
|
inlink ->w, inlink ->h, av_get_pix_fmt_name(inlink->format),
|
|
|
|
outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
|
2010-05-07 22:12:10 +00:00
|
|
|
scale->flags);
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2013-05-12 13:41:49 +00:00
|
|
|
scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL ||
|
|
|
|
desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL;
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2011-03-09 02:30:24 +00:00
|
|
|
if (scale->sws)
|
|
|
|
sws_freeContext(scale->sws);
|
2012-03-29 05:02:27 +00:00
|
|
|
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);
|
|
|
|
}
|
2010-05-07 22:12:13 +00:00
|
|
|
|
2011-08-26 23:49:55 +00:00
|
|
|
|
|
|
|
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;
|
|
|
|
|
2011-01-16 20:11:46 +00:00
|
|
|
return 0;
|
2011-03-27 20:58:08 +00:00
|
|
|
|
|
|
|
fail:
|
|
|
|
av_log(NULL, AV_LOG_ERROR,
|
|
|
|
"Error when evaluating the expression '%s'\n", expr);
|
|
|
|
return ret;
|
2009-11-11 23:50:21 +00:00
|
|
|
}
|
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
static int filter_frame(AVFilterLink *link, AVFrame *in)
|
2009-11-11 23:50:21 +00:00
|
|
|
{
|
|
|
|
ScaleContext *scale = link->dst->priv;
|
|
|
|
AVFilterLink *outlink = link->dst->outputs[0];
|
2012-11-28 07:41:07 +00:00
|
|
|
AVFrame *out;
|
2012-10-06 11:29:37 +00:00
|
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2012-11-27 06:49:45 +00:00
|
|
|
if (!scale->sws)
|
|
|
|
return ff_filter_frame(outlink, in);
|
2012-03-29 05:02:27 +00:00
|
|
|
|
2012-10-06 11:29:37 +00:00
|
|
|
scale->hsub = desc->log2_chroma_w;
|
|
|
|
scale->vsub = desc->log2_chroma_h;
|
2009-11-29 18:02:19 +00:00
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
|
2012-11-27 06:49:45 +00:00
|
|
|
if (!out) {
|
2012-11-28 07:41:07 +00:00
|
|
|
av_frame_free(&in);
|
2012-07-08 15:29:42 +00:00
|
|
|
return AVERROR(ENOMEM);
|
|
|
|
}
|
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
av_frame_copy_props(out, in);
|
|
|
|
out->width = outlink->w;
|
|
|
|
out->height = outlink->h;
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
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,
|
2012-11-27 06:49:45 +00:00
|
|
|
INT_MAX);
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
sws_scale(scale->sws, in->data, in->linesize, 0, in->height,
|
2012-11-27 06:49:45 +00:00
|
|
|
out->data, out->linesize);
|
2012-03-29 05:02:27 +00:00
|
|
|
|
2012-11-28 07:41:07 +00:00
|
|
|
av_frame_free(&in);
|
2012-11-27 06:49:45 +00:00
|
|
|
return ff_filter_frame(outlink, out);
|
2009-11-11 23:50:21 +00:00
|
|
|
}
|
|
|
|
|
2013-02-25 20:21:29 +00:00
|
|
|
#define OFFSET(x) offsetof(ScaleContext, x)
|
|
|
|
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
|
|
|
|
static const AVOption options[] = {
|
|
|
|
{ "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, { .str = "iw" }, .flags = FLAGS },
|
|
|
|
{ "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, { .str = "ih" }, .flags = FLAGS },
|
|
|
|
{ "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "bilinear" }, .flags = FLAGS },
|
|
|
|
{ NULL },
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVClass scale_class = {
|
|
|
|
.class_name = "scale",
|
|
|
|
.item_name = av_default_item_name,
|
|
|
|
.option = options,
|
|
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
|
|
};
|
|
|
|
|
2012-07-24 13:14:01 +00:00
|
|
|
static const AVFilterPad avfilter_vf_scale_inputs[] = {
|
|
|
|
{
|
|
|
|
.name = "default",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-11-27 06:49:45 +00:00
|
|
|
.filter_frame = filter_frame,
|
2012-07-24 13:14:01 +00:00
|
|
|
},
|
|
|
|
{ NULL }
|
|
|
|
};
|
|
|
|
|
|
|
|
static const AVFilterPad avfilter_vf_scale_outputs[] = {
|
|
|
|
{
|
|
|
|
.name = "default",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
|
|
.config_props = config_props,
|
|
|
|
},
|
|
|
|
{ NULL }
|
|
|
|
};
|
|
|
|
|
2013-10-28 06:44:24 +00:00
|
|
|
AVFilter ff_vf_scale = {
|
2009-11-11 23:50:21 +00:00
|
|
|
.name = "scale",
|
2010-09-24 20:41:14 +00:00
|
|
|
.description = NULL_IF_CONFIG_SMALL("Scale the input video to width:height size and/or convert the image format."),
|
2009-11-11 23:50:21 +00:00
|
|
|
|
|
|
|
.init = init,
|
|
|
|
.uninit = uninit,
|
|
|
|
|
|
|
|
.query_formats = query_formats,
|
|
|
|
|
|
|
|
.priv_size = sizeof(ScaleContext),
|
2013-02-25 20:21:29 +00:00
|
|
|
.priv_class = &scale_class,
|
2009-11-11 23:50:21 +00:00
|
|
|
|
2012-07-24 13:14:01 +00:00
|
|
|
.inputs = avfilter_vf_scale_inputs,
|
|
|
|
.outputs = avfilter_vf_scale_outputs,
|
2009-11-11 23:50:21 +00:00
|
|
|
};
|