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FFmpeg/libavfilter/vf_scale.c
Martin Storsjö e645a1ddb9 libavfilter: vf_scale: Properly take in->color_range into account 
While swscale can be reconfigured with sws_setColorspaceDetails,
the in/out ranges also need to be set before calling
sws_init_context, otherwise the initialization might choose
fastpaths that don't take the ranges into account.

Therefore, look at in->color_range too, when deciding on whether
the scaler needs to be reconfigured.

Add a new member variable for keeping track of this, for being
able to differentiate between whether the scale filter parameter
"in_range" has been set (which should override whatever the input
frame has set) or whether it has been configured based on the
latest frame (which should trigger reconfiguring the scaler if
the input frame ranges change).

Fixes: Ticket #9576

Signed-off-by: Martin Storsjö <martin@martin.st>
2022-03-07 00:15:23 +02:00

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/*
* Copyright (c) 2007 Bobby Bingham
*
* This file is part of FFmpeg.
*
* FFmpeg 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,
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* scale video filter
*/
#include <stdio.h>
#include <string.h>
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "scale_eval.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/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libswscale/swscale.h"
static const char *const var_names[] = {
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a",
"sar",
"dar",
"hsub",
"vsub",
"ohsub",
"ovsub",
"n",
"t",
"pos",
"main_w",
"main_h",
"main_a",
"main_sar",
"main_dar", "mdar",
"main_hsub",
"main_vsub",
"main_n",
"main_t",
"main_pos",
NULL
};
enum var_name {
VAR_IN_W, VAR_IW,
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
VAR_A,
VAR_SAR,
VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VAR_OHSUB,
VAR_OVSUB,
VAR_N,
VAR_T,
VAR_POS,
VAR_S2R_MAIN_W,
VAR_S2R_MAIN_H,
VAR_S2R_MAIN_A,
VAR_S2R_MAIN_SAR,
VAR_S2R_MAIN_DAR, VAR_S2R_MDAR,
VAR_S2R_MAIN_HSUB,
VAR_S2R_MAIN_VSUB,
VAR_S2R_MAIN_N,
VAR_S2R_MAIN_T,
VAR_S2R_MAIN_POS,
VARS_NB
};
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
typedef struct ScaleContext {
const AVClass *class;
struct SwsContext *sws; ///< software scaler context
struct SwsContext *isws[2]; ///< software scaler context for interlaced material
AVDictionary *opts;
/**
* New dimensions. Special values are:
* 0 = original width/height
* -1 = keep original aspect
* -N = try to keep aspect but make sure it is divisible by N
*/
int w, h;
char *size_str;
unsigned int flags; ///sws flags
double param[2]; // sws params
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
int output_is_pal; ///< set to 1 if the output format is paletted
int interlaced;
char *w_expr; ///< width expression string
char *h_expr; ///< height expression string
AVExpr *w_pexpr;
AVExpr *h_pexpr;
double var_values[VARS_NB];
char *flags_str;
char *in_color_matrix;
char *out_color_matrix;
int in_range;
int in_frame_range;
int out_range;
int out_h_chr_pos;
int out_v_chr_pos;
int in_h_chr_pos;
int in_v_chr_pos;
int force_original_aspect_ratio;
int force_divisible_by;
int eval_mode; ///< expression evaluation mode
} ScaleContext;
const AVFilter ff_vf_scale2ref;
static int config_props(AVFilterLink *outlink);
static int check_exprs(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
unsigned vars_w[VARS_NB] = { 0 }, vars_h[VARS_NB] = { 0 };
if (!scale->w_pexpr && !scale->h_pexpr)
return AVERROR(EINVAL);
if (scale->w_pexpr)
av_expr_count_vars(scale->w_pexpr, vars_w, VARS_NB);
if (scale->h_pexpr)
av_expr_count_vars(scale->h_pexpr, vars_h, VARS_NB);
if (vars_w[VAR_OUT_W] || vars_w[VAR_OW]) {
av_log(ctx, AV_LOG_ERROR, "Width expression cannot be self-referencing: '%s'.\n", scale->w_expr);
return AVERROR(EINVAL);
}
if (vars_h[VAR_OUT_H] || vars_h[VAR_OH]) {
av_log(ctx, AV_LOG_ERROR, "Height expression cannot be self-referencing: '%s'.\n", scale->h_expr);
return AVERROR(EINVAL);
}
if ((vars_w[VAR_OUT_H] || vars_w[VAR_OH]) &&
(vars_h[VAR_OUT_W] || vars_h[VAR_OW])) {
av_log(ctx, AV_LOG_WARNING, "Circular references detected for width '%s' and height '%s' - possibly invalid.\n", scale->w_expr, scale->h_expr);
}
if (ctx->filter != &ff_vf_scale2ref &&
(vars_w[VAR_S2R_MAIN_W] || vars_h[VAR_S2R_MAIN_W] ||
vars_w[VAR_S2R_MAIN_H] || vars_h[VAR_S2R_MAIN_H] ||
vars_w[VAR_S2R_MAIN_A] || vars_h[VAR_S2R_MAIN_A] ||
vars_w[VAR_S2R_MAIN_SAR] || vars_h[VAR_S2R_MAIN_SAR] ||
vars_w[VAR_S2R_MAIN_DAR] || vars_h[VAR_S2R_MAIN_DAR] ||
vars_w[VAR_S2R_MDAR] || vars_h[VAR_S2R_MDAR] ||
vars_w[VAR_S2R_MAIN_HSUB] || vars_h[VAR_S2R_MAIN_HSUB] ||
vars_w[VAR_S2R_MAIN_VSUB] || vars_h[VAR_S2R_MAIN_VSUB] ||
vars_w[VAR_S2R_MAIN_N] || vars_h[VAR_S2R_MAIN_N] ||
vars_w[VAR_S2R_MAIN_T] || vars_h[VAR_S2R_MAIN_T] ||
vars_w[VAR_S2R_MAIN_POS] || vars_h[VAR_S2R_MAIN_POS]) ) {
av_log(ctx, AV_LOG_ERROR, "Expressions with scale2ref variables are not valid in scale filter.\n");
return AVERROR(EINVAL);
}
if (scale->eval_mode == EVAL_MODE_INIT &&
(vars_w[VAR_N] || vars_h[VAR_N] ||
vars_w[VAR_T] || vars_h[VAR_T] ||
vars_w[VAR_POS] || vars_h[VAR_POS] ||
vars_w[VAR_S2R_MAIN_N] || vars_h[VAR_S2R_MAIN_N] ||
vars_w[VAR_S2R_MAIN_T] || vars_h[VAR_S2R_MAIN_T] ||
vars_w[VAR_S2R_MAIN_POS] || vars_h[VAR_S2R_MAIN_POS]) ) {
av_log(ctx, AV_LOG_ERROR, "Expressions with frame variables 'n', 't', 'pos' are not valid in init eval_mode.\n");
return AVERROR(EINVAL);
}
return 0;
}
static int scale_parse_expr(AVFilterContext *ctx, char *str_expr, AVExpr **pexpr_ptr, const char *var, const char *args)
{
ScaleContext *scale = ctx->priv;
int ret, is_inited = 0;
char *old_str_expr = NULL;
AVExpr *old_pexpr = NULL;
if (str_expr) {
old_str_expr = av_strdup(str_expr);
if (!old_str_expr)
return AVERROR(ENOMEM);
av_opt_set(scale, var, args, 0);
}
if (*pexpr_ptr) {
old_pexpr = *pexpr_ptr;
*pexpr_ptr = NULL;
is_inited = 1;
}
ret = av_expr_parse(pexpr_ptr, args, var_names,
NULL, NULL, NULL, NULL, 0, ctx);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Cannot parse expression for %s: '%s'\n", var, args);
goto revert;
}
ret = check_exprs(ctx);
if (ret < 0)
goto revert;
if (is_inited && (ret = config_props(ctx->outputs[0])) < 0)
goto revert;
av_expr_free(old_pexpr);
old_pexpr = NULL;
av_freep(&old_str_expr);
return 0;
revert:
av_expr_free(*pexpr_ptr);
*pexpr_ptr = NULL;
if (old_str_expr) {
av_opt_set(scale, var, old_str_expr, 0);
av_free(old_str_expr);
}
if (old_pexpr)
*pexpr_ptr = old_pexpr;
return ret;
}
static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
{
ScaleContext *scale = ctx->priv;
int ret;
if (scale->size_str && (scale->w_expr || scale->h_expr)) {
av_log(ctx, AV_LOG_ERROR,
"Size and width/height expressions cannot be set at the same time.\n");
return AVERROR(EINVAL);
}
if (scale->w_expr && !scale->h_expr)
FFSWAP(char *, scale->w_expr, scale->size_str);
if (scale->size_str) {
char buf[32];
if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Invalid size '%s'\n", scale->size_str);
return ret;
}
snprintf(buf, sizeof(buf)-1, "%d", scale->w);
av_opt_set(scale, "w", buf, 0);
snprintf(buf, sizeof(buf)-1, "%d", scale->h);
av_opt_set(scale, "h", buf, 0);
}
if (!scale->w_expr)
av_opt_set(scale, "w", "iw", 0);
if (!scale->h_expr)
av_opt_set(scale, "h", "ih", 0);
ret = scale_parse_expr(ctx, NULL, &scale->w_pexpr, "width", scale->w_expr);
if (ret < 0)
return ret;
ret = scale_parse_expr(ctx, NULL, &scale->h_pexpr, "height", scale->h_expr);
if (ret < 0)
return ret;
av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:'%s' interl:%d\n",
scale->w_expr, scale->h_expr, (char *)av_x_if_null(scale->flags_str, ""), scale->interlaced);
scale->flags = 0;
if (scale->flags_str && *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;
}
scale->opts = *opts;
*opts = NULL;
scale->in_frame_range = AVCOL_RANGE_UNSPECIFIED;
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
av_expr_free(scale->w_pexpr);
av_expr_free(scale->h_pexpr);
scale->w_pexpr = scale->h_pexpr = NULL;
sws_freeContext(scale->sws);
sws_freeContext(scale->isws[0]);
sws_freeContext(scale->isws[1]);
scale->sws = NULL;
av_dict_free(&scale->opts);
}
static int query_formats(AVFilterContext *ctx)
{
AVFilterFormats *formats;
const AVPixFmtDescriptor *desc;
enum AVPixelFormat pix_fmt;
int ret;
desc = NULL;
formats = NULL;
while ((desc = av_pix_fmt_desc_next(desc))) {
pix_fmt = av_pix_fmt_desc_get_id(desc);
if ((sws_isSupportedInput(pix_fmt) ||
sws_isSupportedEndiannessConversion(pix_fmt))
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
return ret;
}
}
if ((ret = ff_formats_ref(formats, &ctx->inputs[0]->outcfg.formats)) < 0)
return ret;
desc = NULL;
formats = NULL;
while ((desc = av_pix_fmt_desc_next(desc))) {
pix_fmt = av_pix_fmt_desc_get_id(desc);
if ((sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8 ||
sws_isSupportedEndiannessConversion(pix_fmt))
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
return ret;
}
}
if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->incfg.formats)) < 0)
return ret;
return 0;
}
static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
{
if (!s)
s = "bt601";
if (s && strstr(s, "bt709")) {
colorspace = AVCOL_SPC_BT709;
} else if (s && strstr(s, "fcc")) {
colorspace = AVCOL_SPC_FCC;
} else if (s && strstr(s, "smpte240m")) {
colorspace = AVCOL_SPC_SMPTE240M;
} else if (s && (strstr(s, "bt601") || strstr(s, "bt470") || strstr(s, "smpte170m"))) {
colorspace = AVCOL_SPC_BT470BG;
} else if (s && strstr(s, "bt2020")) {
colorspace = AVCOL_SPC_BT2020_NCL;
}
if (colorspace < 1 || colorspace > 10 || colorspace == 8) {
colorspace = AVCOL_SPC_BT470BG;
}
return sws_getCoefficients(colorspace);
}
static int scale_eval_dimensions(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
const char scale2ref = ctx->filter == &ff_vf_scale2ref;
const AVFilterLink *inlink = scale2ref ? ctx->inputs[1] : ctx->inputs[0];
const AVFilterLink *outlink = ctx->outputs[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const AVPixFmtDescriptor *out_desc = av_pix_fmt_desc_get(outlink->format);
char *expr;
int eval_w, eval_h;
int ret;
double res;
const AVPixFmtDescriptor *main_desc;
const AVFilterLink *main_link;
if (scale2ref) {
main_link = ctx->inputs[0];
main_desc = av_pix_fmt_desc_get(main_link->format);
}
scale->var_values[VAR_IN_W] = scale->var_values[VAR_IW] = inlink->w;
scale->var_values[VAR_IN_H] = scale->var_values[VAR_IH] = inlink->h;
scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = NAN;
scale->var_values[VAR_OUT_H] = scale->var_values[VAR_OH] = NAN;
scale->var_values[VAR_A] = (double) inlink->w / inlink->h;
scale->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
scale->var_values[VAR_DAR] = scale->var_values[VAR_A] * scale->var_values[VAR_SAR];
scale->var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
scale->var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
scale->var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
scale->var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
if (scale2ref) {
scale->var_values[VAR_S2R_MAIN_W] = main_link->w;
scale->var_values[VAR_S2R_MAIN_H] = main_link->h;
scale->var_values[VAR_S2R_MAIN_A] = (double) main_link->w / main_link->h;
scale->var_values[VAR_S2R_MAIN_SAR] = main_link->sample_aspect_ratio.num ?
(double) main_link->sample_aspect_ratio.num / main_link->sample_aspect_ratio.den : 1;
scale->var_values[VAR_S2R_MAIN_DAR] = scale->var_values[VAR_S2R_MDAR] =
scale->var_values[VAR_S2R_MAIN_A] * scale->var_values[VAR_S2R_MAIN_SAR];
scale->var_values[VAR_S2R_MAIN_HSUB] = 1 << main_desc->log2_chroma_w;
scale->var_values[VAR_S2R_MAIN_VSUB] = 1 << main_desc->log2_chroma_h;
}
res = av_expr_eval(scale->w_pexpr, scale->var_values, NULL);
eval_w = scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
res = av_expr_eval(scale->h_pexpr, scale->var_values, NULL);
if (isnan(res)) {
expr = scale->h_expr;
ret = AVERROR(EINVAL);
goto fail;
}
eval_h = scale->var_values[VAR_OUT_H] = scale->var_values[VAR_OH] = (int) res == 0 ? inlink->h : (int) res;
res = av_expr_eval(scale->w_pexpr, scale->var_values, NULL);
if (isnan(res)) {
expr = scale->w_expr;
ret = AVERROR(EINVAL);
goto fail;
}
eval_w = scale->var_values[VAR_OUT_W] = scale->var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
scale->w = eval_w;
scale->h = eval_h;
return 0;
fail:
av_log(ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s'.\n", expr);
return ret;
}
static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink0 = outlink->src->inputs[0];
AVFilterLink *inlink = ctx->filter == &ff_vf_scale2ref ?
outlink->src->inputs[1] :
outlink->src->inputs[0];
enum AVPixelFormat outfmt = outlink->format;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
ScaleContext *scale = ctx->priv;
int ret;
if ((ret = scale_eval_dimensions(ctx)) < 0)
goto fail;
ff_scale_adjust_dimensions(inlink, &scale->w, &scale->h,
scale->force_original_aspect_ratio,
scale->force_divisible_by);
if (scale->w > INT_MAX ||
scale->h > INT_MAX ||
(scale->h * inlink->w) > INT_MAX ||
(scale->w * inlink->h) > INT_MAX)
av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
outlink->w = scale->w;
outlink->h = scale->h;
/* TODO: make algorithm configurable */
scale->input_is_pal = desc->flags & AV_PIX_FMT_FLAG_PAL;
if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & AV_PIX_FMT_FLAG_PAL;
if (scale->sws)
sws_freeContext(scale->sws);
if (scale->isws[0])
sws_freeContext(scale->isws[0]);
if (scale->isws[1])
sws_freeContext(scale->isws[1]);
scale->isws[0] = scale->isws[1] = scale->sws = NULL;
if (inlink0->w == outlink->w &&
inlink0->h == outlink->h &&
!scale->out_color_matrix &&
scale->in_range == scale->out_range &&
inlink0->format == outlink->format)
;
else {
struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
int i;
for (i = 0; i < 3; i++) {
int in_v_chr_pos = scale->in_v_chr_pos, out_v_chr_pos = scale->out_v_chr_pos;
struct SwsContext *const s = sws_alloc_context();
if (!s)
return AVERROR(ENOMEM);
*swscs[i] = s;
av_opt_set_int(s, "srcw", inlink0 ->w, 0);
av_opt_set_int(s, "srch", inlink0 ->h >> !!i, 0);
av_opt_set_int(s, "src_format", inlink0->format, 0);
av_opt_set_int(s, "dstw", outlink->w, 0);
av_opt_set_int(s, "dsth", outlink->h >> !!i, 0);
av_opt_set_int(s, "dst_format", outfmt, 0);
av_opt_set_int(s, "sws_flags", scale->flags, 0);
av_opt_set_int(s, "param0", scale->param[0], 0);
av_opt_set_int(s, "param1", scale->param[1], 0);
av_opt_set_int(s, "threads", ff_filter_get_nb_threads(ctx), 0);
if (scale->in_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(s, "src_range",
scale->in_range == AVCOL_RANGE_JPEG, 0);
else if (scale->in_frame_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(s, "src_range",
scale->in_frame_range == AVCOL_RANGE_JPEG, 0);
if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(s, "dst_range",
scale->out_range == AVCOL_RANGE_JPEG, 0);
if (scale->opts) {
AVDictionaryEntry *e = NULL;
while ((e = av_dict_get(scale->opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
if ((ret = av_opt_set(s, e->key, e->value, 0)) < 0)
return ret;
}
}
/* Override YUV420P default settings to have the correct (MPEG-2) chroma positions
* MPEG-2 chroma positions are used by convention
* XXX: support other 4:2:0 pixel formats */
if (inlink0->format == AV_PIX_FMT_YUV420P && scale->in_v_chr_pos == -513) {
in_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
if (outlink->format == AV_PIX_FMT_YUV420P && scale->out_v_chr_pos == -513) {
out_v_chr_pos = (i == 0) ? 128 : (i == 1) ? 64 : 192;
}
av_opt_set_int(s, "src_h_chr_pos", scale->in_h_chr_pos, 0);
av_opt_set_int(s, "src_v_chr_pos", in_v_chr_pos, 0);
av_opt_set_int(s, "dst_h_chr_pos", scale->out_h_chr_pos, 0);
av_opt_set_int(s, "dst_v_chr_pos", out_v_chr_pos, 0);
if ((ret = sws_init_context(s, NULL, NULL)) < 0)
return ret;
if (!scale->interlaced)
break;
}
}
if (inlink0->sample_aspect_ratio.num){
outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink0->w, outlink->w * inlink0->h}, inlink0->sample_aspect_ratio);
} else
outlink->sample_aspect_ratio = inlink0->sample_aspect_ratio;
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",
inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
scale->flags);
return 0;
fail:
return ret;
}
static int config_props_ref(AVFilterLink *outlink)
{
AVFilterLink *inlink = outlink->src->inputs[1];
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->time_base = inlink->time_base;
outlink->frame_rate = inlink->frame_rate;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
return ff_request_frame(outlink->src->inputs[0]);
}
static int request_frame_ref(AVFilterLink *outlink)
{
return ff_request_frame(outlink->src->inputs[1]);
}
static void frame_offset(AVFrame *frame, int dir, int is_pal)
{
for (int i = 0; i < 4 && frame->data[i]; i++) {
if (i == 1 && is_pal)
break;
frame->data[i] += frame->linesize[i] * dir;
}
}
static int scale_field(ScaleContext *scale, AVFrame *dst, AVFrame *src,
int field)
{
int orig_h_src = src->height;
int orig_h_dst = dst->height;
int ret;
// offset the data pointers for the bottom field
if (field) {
frame_offset(src, 1, scale->input_is_pal);
frame_offset(dst, 1, scale->output_is_pal);
}
// take every second line
for (int i = 0; i < 4; i++) {
src->linesize[i] *= 2;
dst->linesize[i] *= 2;
}
src->height /= 2;
dst->height /= 2;
ret = sws_scale_frame(scale->isws[field], dst, src);
if (ret < 0)
return ret;
// undo the changes we made above
for (int i = 0; i < 4; i++) {
src->linesize[i] /= 2;
dst->linesize[i] /= 2;
}
src->height = orig_h_src;
dst->height = orig_h_dst;
if (field) {
frame_offset(src, -1, scale->input_is_pal);
frame_offset(dst, -1, scale->output_is_pal);
}
return 0;
}
static int scale_frame(AVFilterLink *link, AVFrame *in, AVFrame **frame_out)
{
AVFilterContext *ctx = link->dst;
ScaleContext *scale = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
char buf[32];
int ret;
int in_range;
int frame_changed;
*frame_out = NULL;
if (in->colorspace == AVCOL_SPC_YCGCO)
av_log(link->dst, AV_LOG_WARNING, "Detected unsupported YCgCo colorspace.\n");
frame_changed = in->width != link->w ||
in->height != link->h ||
in->format != link->format ||
in->sample_aspect_ratio.den != link->sample_aspect_ratio.den ||
in->sample_aspect_ratio.num != link->sample_aspect_ratio.num;
if (in->color_range != AVCOL_RANGE_UNSPECIFIED &&
scale->in_range == AVCOL_RANGE_UNSPECIFIED &&
in->color_range != scale->in_frame_range) {
scale->in_frame_range = in->color_range;
frame_changed = 1;
}
if (scale->eval_mode == EVAL_MODE_FRAME || frame_changed) {
unsigned vars_w[VARS_NB] = { 0 }, vars_h[VARS_NB] = { 0 };
av_expr_count_vars(scale->w_pexpr, vars_w, VARS_NB);
av_expr_count_vars(scale->h_pexpr, vars_h, VARS_NB);
if (scale->eval_mode == EVAL_MODE_FRAME &&
!frame_changed &&
ctx->filter != &ff_vf_scale2ref &&
!(vars_w[VAR_N] || vars_w[VAR_T] || vars_w[VAR_POS]) &&
!(vars_h[VAR_N] || vars_h[VAR_T] || vars_h[VAR_POS]) &&
scale->w && scale->h)
goto scale;
if (scale->eval_mode == EVAL_MODE_INIT) {
snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
av_opt_set(scale, "w", buf, 0);
snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
av_opt_set(scale, "h", buf, 0);
ret = scale_parse_expr(ctx, NULL, &scale->w_pexpr, "width", scale->w_expr);
if (ret < 0)
return ret;
ret = scale_parse_expr(ctx, NULL, &scale->h_pexpr, "height", scale->h_expr);
if (ret < 0)
return ret;
}
if (ctx->filter == &ff_vf_scale2ref) {
scale->var_values[VAR_S2R_MAIN_N] = link->frame_count_out;
scale->var_values[VAR_S2R_MAIN_T] = TS2T(in->pts, link->time_base);
scale->var_values[VAR_S2R_MAIN_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
} else {
scale->var_values[VAR_N] = link->frame_count_out;
scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
}
link->dst->inputs[0]->format = in->format;
link->dst->inputs[0]->w = in->width;
link->dst->inputs[0]->h = in->height;
link->dst->inputs[0]->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
link->dst->inputs[0]->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
if ((ret = config_props(outlink)) < 0)
return ret;
}
scale:
if (!scale->sws) {
*frame_out = in;
return 0;
}
scale->hsub = desc->log2_chroma_w;
scale->vsub = desc->log2_chroma_h;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
*frame_out = out;
av_frame_copy_props(out, in);
out->width = outlink->w;
out->height = outlink->h;
// Sanity checks:
// 1. If the output is RGB, set the matrix coefficients to RGB.
// 2. If the output is not RGB and we've got the RGB/XYZ (identity)
// matrix configured, unset the matrix.
// In theory these should be in swscale itself as the AVFrame
// based API gets in, so that not every swscale API user has
// to go through duplicating such sanity checks.
if (av_pix_fmt_desc_get(out->format)->flags & AV_PIX_FMT_FLAG_RGB)
out->colorspace = AVCOL_SPC_RGB;
else if (out->colorspace == AVCOL_SPC_RGB)
out->colorspace = AVCOL_SPC_UNSPECIFIED;
if (scale->output_is_pal)
avpriv_set_systematic_pal2((uint32_t*)out->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
in_range = in->color_range;
if ( scale->in_color_matrix
|| scale->out_color_matrix
|| scale-> in_range != AVCOL_RANGE_UNSPECIFIED
|| in_range != AVCOL_RANGE_UNSPECIFIED
|| scale->out_range != AVCOL_RANGE_UNSPECIFIED) {
int in_full, out_full, brightness, contrast, saturation;
const int *inv_table, *table;
sws_getColorspaceDetails(scale->sws, (int **)&inv_table, &in_full,
(int **)&table, &out_full,
&brightness, &contrast, &saturation);
if (scale->in_color_matrix)
inv_table = parse_yuv_type(scale->in_color_matrix, in->colorspace);
if (scale->out_color_matrix)
table = parse_yuv_type(scale->out_color_matrix, AVCOL_SPC_UNSPECIFIED);
else if (scale->in_color_matrix)
table = inv_table;
if (scale-> in_range != AVCOL_RANGE_UNSPECIFIED)
in_full = (scale-> in_range == AVCOL_RANGE_JPEG);
else if (in_range != AVCOL_RANGE_UNSPECIFIED)
in_full = (in_range == AVCOL_RANGE_JPEG);
if (scale->out_range != AVCOL_RANGE_UNSPECIFIED)
out_full = (scale->out_range == AVCOL_RANGE_JPEG);
sws_setColorspaceDetails(scale->sws, inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
if (scale->isws[0])
sws_setColorspaceDetails(scale->isws[0], inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
if (scale->isws[1])
sws_setColorspaceDetails(scale->isws[1], inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
out->color_range = out_full ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
}
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);
if (scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)) {
ret = scale_field(scale, out, in, 0);
if (ret >= 0)
ret = scale_field(scale, out, in, 1);
} else {
ret = sws_scale_frame(scale->sws, out, in);
}
av_frame_free(&in);
if (ret < 0)
av_frame_free(frame_out);
return ret;
}
static int filter_frame(AVFilterLink *link, AVFrame *in)
{
AVFilterContext *ctx = link->dst;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
int ret;
ret = scale_frame(link, in, &out);
if (out)
return ff_filter_frame(outlink, out);
return ret;
}
static int filter_frame_ref(AVFilterLink *link, AVFrame *in)
{
ScaleContext *scale = link->dst->priv;
AVFilterLink *outlink = link->dst->outputs[1];
int frame_changed;
frame_changed = in->width != link->w ||
in->height != link->h ||
in->format != link->format ||
in->sample_aspect_ratio.den != link->sample_aspect_ratio.den ||
in->sample_aspect_ratio.num != link->sample_aspect_ratio.num;
if (frame_changed) {
link->format = in->format;
link->w = in->width;
link->h = in->height;
link->sample_aspect_ratio.num = in->sample_aspect_ratio.num;
link->sample_aspect_ratio.den = in->sample_aspect_ratio.den;
config_props_ref(outlink);
}
if (scale->eval_mode == EVAL_MODE_FRAME) {
scale->var_values[VAR_N] = link->frame_count_out;
scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
}
return ff_filter_frame(outlink, in);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
ScaleContext *scale = ctx->priv;
char *str_expr;
AVExpr **pexpr_ptr;
int ret, w, h;
w = !strcmp(cmd, "width") || !strcmp(cmd, "w");
h = !strcmp(cmd, "height") || !strcmp(cmd, "h");
if (w || h) {
str_expr = w ? scale->w_expr : scale->h_expr;
pexpr_ptr = w ? &scale->w_pexpr : &scale->h_pexpr;
ret = scale_parse_expr(ctx, str_expr, pexpr_ptr, cmd, args);
} else
ret = AVERROR(ENOSYS);
if (ret < 0)
av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n");
return ret;
}
static const AVClass *child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : sws_get_class();
*iter = (void*)(uintptr_t)c;
return c;
}
#define OFFSET(x) offsetof(ScaleContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define TFLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption scale_options[] = {
{ "w", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
{ "width", "Output video width", OFFSET(w_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
{ "h", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
{ "height","Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, .flags = TFLAGS },
{ "flags", "Flags to pass to libswscale", OFFSET(flags_str), AV_OPT_TYPE_STRING, { .str = "" }, .flags = FLAGS },
{ "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_BOOL, {.i64 = 0 }, -1, 1, FLAGS },
{ "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
{ "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
{ "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_STRING, { .str = "auto" }, .flags = FLAGS, "color" },
{ "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = FLAGS, "color"},
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .str = "auto" }, 0, 0, FLAGS, "color" },
{ "bt601", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt601" }, 0, 0, FLAGS, "color" },
{ "bt470", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt470" }, 0, 0, FLAGS, "color" },
{ "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, { .str = "smpte170m" }, 0, 0, FLAGS, "color" },
{ "bt709", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt709" }, 0, 0, FLAGS, "color" },
{ "fcc", NULL, 0, AV_OPT_TYPE_CONST, { .str = "fcc" }, 0, 0, FLAGS, "color" },
{ "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, { .str = "smpte240m" }, 0, 0, FLAGS, "color" },
{ "bt2020", NULL, 0, AV_OPT_TYPE_CONST, { .str = "bt2020" }, 0, 0, FLAGS, "color" },
{ "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
{ "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, "range" },
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
{ "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, "range" },
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "limited",NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
{ "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
{ "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, "range" },
{ "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, "range" },
{ "in_v_chr_pos", "input vertical chroma position in luma grid/256" , OFFSET(in_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "in_h_chr_pos", "input horizontal chroma position in luma grid/256", OFFSET(in_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "out_v_chr_pos", "output vertical chroma position in luma grid/256" , OFFSET(out_v_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "out_h_chr_pos", "output horizontal chroma position in luma grid/256", OFFSET(out_h_chr_pos), AV_OPT_TYPE_INT, { .i64 = -513}, -513, 512, FLAGS },
{ "force_original_aspect_ratio", "decrease or increase w/h if necessary to keep the original AR", OFFSET(force_original_aspect_ratio), AV_OPT_TYPE_INT, { .i64 = 0}, 0, 2, FLAGS, "force_oar" },
{ "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, "force_oar" },
{ "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, "force_oar" },
{ "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, "force_oar" },
{ "force_divisible_by", "enforce that the output resolution is divisible by a defined integer when force_original_aspect_ratio is used", OFFSET(force_divisible_by), AV_OPT_TYPE_INT, { .i64 = 1}, 1, 256, FLAGS },
{ "param0", "Scaler param 0", OFFSET(param[0]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
{ "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = SWS_PARAM_DEFAULT }, INT_MIN, INT_MAX, FLAGS },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
{ NULL }
};
static const AVClass scale_class = {
.class_name = "scale(2ref)",
.item_name = av_default_item_name,
.option = scale_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_class_iterate = child_class_iterate,
};
static const AVFilterPad avfilter_vf_scale_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad avfilter_vf_scale_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
},
};
const AVFilter ff_vf_scale = {
.name = "scale",
.description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format."),
.init_dict = init_dict,
.uninit = uninit,
.priv_size = sizeof(ScaleContext),
.priv_class = &scale_class,
FILTER_INPUTS(avfilter_vf_scale_inputs),
FILTER_OUTPUTS(avfilter_vf_scale_outputs),
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
};
static const AVFilterPad avfilter_vf_scale2ref_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{
.name = "ref",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame_ref,
},
};
static const AVFilterPad avfilter_vf_scale2ref_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.request_frame= request_frame,
},
{
.name = "ref",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props_ref,
.request_frame= request_frame_ref,
},
};
const AVFilter ff_vf_scale2ref = {
.name = "scale2ref",
.description = NULL_IF_CONFIG_SMALL("Scale the input video size and/or convert the image format to the given reference."),
.init_dict = init_dict,
.uninit = uninit,
.priv_size = sizeof(ScaleContext),
.priv_class = &scale_class,
FILTER_INPUTS(avfilter_vf_scale2ref_inputs),
FILTER_OUTPUTS(avfilter_vf_scale2ref_outputs),
FILTER_QUERY_FUNC(query_formats),
.process_command = process_command,
};
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