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FFmpeg/libavfilter/vf_scale.c
Niklas Haas c8bc6fabd7 avfilter/vf_scale: fix 4:1:0 interlaced chroma pos 
The current logic hard-coded a check for v_sub == 1. We can extend this
logic slightly to cover the case of interlaced 4:1:0 (which has v_sub ==
2).

Here is a diagram explaining this scenario (with center-siting):

a   a   a   a   a   a   a   a

b   b   b   b   b   b   b   b
      X               X
a   a   a   a   a   a   a   a

b   b   b   b   b   b   b   b

a   a   a   a   a   a   a   a

b   b   b   b   b   b   b   b
      Y               Y
a   a   a   a   a   a   a   a

b   b   b   b   b   b   b   b

a = even luma rows
b = odd luma rows
X = even chroma sample
Y = odd chroma sample

In progressive mode, the chroma samples sit at (384, 384) respectively.

Relative to the 8x4 grid of even luma samples (a), the X sample sits at:
  h_chr_pos = 384
  v_chr_pos = 192

Relative to the 8x4 grid of odd luma samples (b), the Y sample sits at:
  h_chr_pos = 384
  v_chr_pos = 576

The new code calculates the correct values in all circumstances.
2024-08-16 11:43:37 +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 <float.h>
#include <stdio.h>
#include <string.h>
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "framesync.h"
#include "internal.h"
#include "scale_eval.h"
#include "video.h"
#include "libavutil/eval.h"
#include "libavutil/imgutils_internal.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.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",
#if FF_API_FRAME_PKT
"pos",
#endif
"ref_w", "rw",
"ref_h", "rh",
"ref_a",
"ref_sar",
"ref_dar", "rdar",
"ref_hsub",
"ref_vsub",
"ref_n",
"ref_t",
"ref_pos",
/* Legacy variables for scale2ref */
"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,
#if FF_API_FRAME_PKT
VAR_POS,
#endif
VAR_REF_W, VAR_RW,
VAR_REF_H, VAR_RH,
VAR_REF_A,
VAR_REF_SAR,
VAR_REF_DAR, VAR_RDAR,
VAR_REF_HSUB,
VAR_REF_VSUB,
VAR_REF_N,
VAR_REF_T,
VAR_REF_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
// context used for forwarding options to sws
struct SwsContext *sws_opts;
FFFrameSync fs;
/**
* 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;
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;
int uses_ref;
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;
int in_color_matrix;
int out_color_matrix;
int in_range;
int out_range;
int in_chroma_loc;
int out_chroma_loc;
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 (vars_w[VAR_REF_W] || vars_h[VAR_REF_W] ||
vars_w[VAR_RW] || vars_h[VAR_RW] ||
vars_w[VAR_REF_H] || vars_h[VAR_REF_H] ||
vars_w[VAR_RH] || vars_h[VAR_RH] ||
vars_w[VAR_REF_A] || vars_h[VAR_REF_A] ||
vars_w[VAR_REF_SAR] || vars_h[VAR_REF_SAR] ||
vars_w[VAR_REF_DAR] || vars_h[VAR_REF_DAR] ||
vars_w[VAR_RDAR] || vars_h[VAR_RDAR] ||
vars_w[VAR_REF_HSUB] || vars_h[VAR_REF_HSUB] ||
vars_w[VAR_REF_VSUB] || vars_h[VAR_REF_VSUB] ||
vars_w[VAR_REF_N] || vars_h[VAR_REF_N] ||
vars_w[VAR_REF_T] || vars_h[VAR_REF_T] ||
vars_w[VAR_REF_POS] || vars_h[VAR_REF_POS]) {
scale->uses_ref = 1;
}
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 (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] ||
#if FF_API_FRAME_PKT
vars_w[VAR_POS] || vars_h[VAR_POS] ||
#endif
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 preinit(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
int ret;
scale->sws_opts = sws_alloc_context();
if (!scale->sws_opts)
return AVERROR(ENOMEM);
// set threads=0, so we can later check whether the user modified it
ret = av_opt_set_int(scale->sws_opts, "threads", 0, 0);
if (ret < 0)
return ret;
ff_framesync_preinit(&scale->fs);
return 0;
}
static const int sws_colorspaces[] = {
AVCOL_SPC_UNSPECIFIED,
AVCOL_SPC_RGB,
AVCOL_SPC_BT709,
AVCOL_SPC_BT470BG,
AVCOL_SPC_SMPTE170M,
AVCOL_SPC_FCC,
AVCOL_SPC_SMPTE240M,
AVCOL_SPC_BT2020_NCL,
-1
};
static int do_scale(FFFrameSync *fs);
static av_cold int init(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
int64_t threads;
int ret;
if (ctx->filter == &ff_vf_scale2ref)
av_log(ctx, AV_LOG_WARNING, "scale2ref is deprecated, use scale=rw:rh instead\n");
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;
if (scale->in_color_matrix != -1 &&
!ff_fmt_is_in(scale->in_color_matrix, sws_colorspaces)) {
av_log(ctx, AV_LOG_ERROR, "Unsupported input color matrix '%s'\n",
av_color_space_name(scale->in_color_matrix));
return AVERROR(EINVAL);
}
if (!ff_fmt_is_in(scale->out_color_matrix, sws_colorspaces)) {
av_log(ctx, AV_LOG_ERROR, "Unsupported output color matrix '%s'\n",
av_color_space_name(scale->out_color_matrix));
return AVERROR(EINVAL);
}
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);
if (scale->flags_str && *scale->flags_str) {
ret = av_opt_set(scale->sws_opts, "sws_flags", scale->flags_str, 0);
if (ret < 0)
return ret;
}
for (int i = 0; i < FF_ARRAY_ELEMS(scale->param); i++)
if (scale->param[i] != DBL_MAX) {
ret = av_opt_set_double(scale->sws_opts, i ? "param1" : "param0",
scale->param[i], 0);
if (ret < 0)
return ret;
}
// use generic thread-count if the user did not set it explicitly
ret = av_opt_get_int(scale->sws_opts, "threads", 0, &threads);
if (ret < 0)
return ret;
if (!threads)
av_opt_set_int(scale->sws_opts, "threads", ff_filter_get_nb_threads(ctx), 0);
if (ctx->filter != &ff_vf_scale2ref && scale->uses_ref) {
AVFilterPad pad = {
.name = "ref",
.type = AVMEDIA_TYPE_VIDEO,
};
ret = ff_append_inpad(ctx, &pad);
if (ret < 0)
return ret;
}
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;
ff_framesync_uninit(&scale->fs);
sws_freeContext(scale->sws_opts);
sws_freeContext(scale->sws);
sws_freeContext(scale->isws[0]);
sws_freeContext(scale->isws[1]);
scale->sws = NULL;
}
static int query_formats(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
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;
/* accept all supported inputs, even if user overrides their properties */
if ((ret = ff_formats_ref(ff_make_format_list(sws_colorspaces),
&ctx->inputs[0]->outcfg.color_spaces)) < 0)
return ret;
if ((ret = ff_formats_ref(ff_all_color_ranges(),
&ctx->inputs[0]->outcfg.color_ranges)) < 0)
return ret;
/* propagate output properties if overridden */
formats = scale->out_color_matrix != AVCOL_SPC_UNSPECIFIED
? ff_make_formats_list_singleton(scale->out_color_matrix)
: ff_make_format_list(sws_colorspaces);
if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->incfg.color_spaces)) < 0)
return ret;
formats = scale->out_range != AVCOL_RANGE_UNSPECIFIED
? ff_make_formats_list_singleton(scale->out_range)
: ff_all_color_ranges();
if ((ret = ff_formats_ref(formats, &ctx->outputs[0]->incfg.color_ranges)) < 0)
return ret;
return 0;
}
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;
}
if (scale->uses_ref) {
const AVFilterLink *reflink = ctx->inputs[1];
const AVPixFmtDescriptor *ref_desc = av_pix_fmt_desc_get(reflink->format);
scale->var_values[VAR_REF_W] = scale->var_values[VAR_RW] = reflink->w;
scale->var_values[VAR_REF_H] = scale->var_values[VAR_RH] = reflink->h;
scale->var_values[VAR_REF_A] = (double) reflink->w / reflink->h;
scale->var_values[VAR_REF_SAR] = reflink->sample_aspect_ratio.num ?
(double) reflink->sample_aspect_ratio.num / reflink->sample_aspect_ratio.den : 1;
scale->var_values[VAR_REF_DAR] = scale->var_values[VAR_RDAR] =
scale->var_values[VAR_REF_A] * scale->var_values[VAR_REF_SAR];
scale->var_values[VAR_REF_HSUB] = 1 << ref_desc->log2_chroma_w;
scale->var_values[VAR_REF_VSUB] = 1 << ref_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 void calc_chroma_pos(int *h_pos_out, int *v_pos_out, int chroma_loc,
int h_pos_override, int v_pos_override,
int h_sub, int v_sub, int index)
{
int h_pos, v_pos;
/* Explicitly default to center siting for compatibility with swscale */
if (chroma_loc == AVCHROMA_LOC_UNSPECIFIED)
chroma_loc = AVCHROMA_LOC_CENTER;
/* av_chroma_location_enum_to_pos() always gives us values in the range from
* 0 to 256, but we need to adjust this to the true value range of the
* subsampling grid, which may be larger for h/v_sub > 1 */
av_chroma_location_enum_to_pos(&h_pos, &v_pos, chroma_loc);
h_pos *= (1 << h_sub) - 1;
v_pos *= (1 << v_sub) - 1;
if (h_pos_override != -513)
h_pos = h_pos_override;
if (v_pos_override != -513)
v_pos = v_pos_override;
/* Fix vertical chroma position for interlaced frames */
if (v_sub && index > 0) {
/* When vertically subsampling, chroma samples are effectively only
* placed next to even rows. To access them from the odd field, we need
* to account for this shift by offsetting the distance of one luma row.
*
* For 4x vertical subsampling (v_sub == 2), they are only placed
* next to every *other* even row, so we need to shift by three luma
* rows to get to the chroma sample. */
if (index == 2)
v_pos += (256 << v_sub) - 256;
/* Luma row distance is doubled for fields, so halve offsets */
v_pos >>= 1;
}
/* Explicitly strip chroma offsets when not subsampling, because it
* interferes with the operation of flags like SWS_FULL_CHR_H_INP */
*h_pos_out = h_sub ? h_pos : -513;
*v_pos_out = v_sub ? v_pos : -513;
}
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);
const AVPixFmtDescriptor *outdesc = av_pix_fmt_desc_get(outfmt);
ScaleContext *scale = ctx->priv;
uint8_t *flags_val = NULL;
int in_range, in_colorspace;
int ret;
if ((ret = scale_eval_dimensions(ctx)) < 0)
goto fail;
outlink->w = scale->w;
outlink->h = scale->h;
ret = ff_scale_adjust_dimensions(inlink, &outlink->w, &outlink->h,
scale->force_original_aspect_ratio,
scale->force_divisible_by);
if (ret < 0)
goto fail;
if (outlink->w > INT_MAX ||
outlink->h > INT_MAX ||
(outlink->h * inlink->w) > INT_MAX ||
(outlink->w * inlink->h) > INT_MAX)
av_log(ctx, AV_LOG_ERROR, "Rescaled value for width or height is too big.\n");
/* 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;
in_range = scale->in_range;
if (in_range == AVCOL_RANGE_UNSPECIFIED)
in_range = inlink0->color_range;
in_colorspace = scale->in_color_matrix;
if (in_colorspace == -1 /* auto */)
in_colorspace = inlink0->colorspace;
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 &&
in_range == outlink->color_range &&
in_colorspace == outlink->colorspace &&
inlink0->format == outlink->format &&
scale->in_chroma_loc == scale->out_chroma_loc)
;
else {
struct SwsContext **swscs[3] = {&scale->sws, &scale->isws[0], &scale->isws[1]};
int i;
for (i = 0; i < 3; i++) {
int in_full, out_full, brightness, contrast, saturation;
int h_chr_pos, v_chr_pos;
const int *inv_table, *table;
struct SwsContext *const s = sws_alloc_context();
if (!s)
return AVERROR(ENOMEM);
*swscs[i] = s;
ret = av_opt_copy(s, scale->sws_opts);
if (ret < 0)
return ret;
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);
if (in_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(s, "src_range",
in_range == AVCOL_RANGE_JPEG, 0);
if (outlink->color_range != AVCOL_RANGE_UNSPECIFIED)
av_opt_set_int(s, "dst_range",
outlink->color_range == AVCOL_RANGE_JPEG, 0);
calc_chroma_pos(&h_chr_pos, &v_chr_pos, scale->in_chroma_loc,
scale->in_h_chr_pos, scale->in_v_chr_pos,
desc->log2_chroma_w, desc->log2_chroma_h, i);
av_opt_set_int(s, "src_h_chr_pos", h_chr_pos, 0);
av_opt_set_int(s, "src_v_chr_pos", v_chr_pos, 0);
calc_chroma_pos(&h_chr_pos, &v_chr_pos, scale->out_chroma_loc,
scale->out_h_chr_pos, scale->out_v_chr_pos,
outdesc->log2_chroma_w, outdesc->log2_chroma_h, i);
av_opt_set_int(s, "dst_h_chr_pos", h_chr_pos, 0);
av_opt_set_int(s, "dst_v_chr_pos", v_chr_pos, 0);
if ((ret = sws_init_context(s, NULL, NULL)) < 0)
return ret;
sws_getColorspaceDetails(s, (int **)&inv_table, &in_full,
(int **)&table, &out_full,
&brightness, &contrast, &saturation);
if (scale->in_color_matrix == -1 /* auto */)
inv_table = sws_getCoefficients(inlink0->colorspace);
else if (scale->in_color_matrix != AVCOL_SPC_UNSPECIFIED)
inv_table = sws_getCoefficients(scale->in_color_matrix);
if (outlink->colorspace != AVCOL_SPC_UNSPECIFIED)
table = sws_getCoefficients(outlink->colorspace);
else if (scale->in_color_matrix != AVCOL_SPC_UNSPECIFIED)
table = inv_table;
sws_setColorspaceDetails(s, inv_table, in_full,
table, out_full,
brightness, contrast, saturation);
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;
if (scale->sws)
av_opt_get(scale->sws, "sws_flags", 0, &flags_val);
av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s csp:%s range:%s sar:%d/%d -> w:%d h:%d fmt:%s csp:%s range:%s sar:%d/%d flags:%s\n",
inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
av_color_space_name(inlink->colorspace), av_color_range_name(inlink->color_range),
inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
av_color_space_name(outlink->colorspace), av_color_range_name(outlink->color_range),
outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
flags_val);
av_freep(&flags_val);
if (ctx->filter != &ff_vf_scale2ref) {
ff_framesync_uninit(&scale->fs);
ret = ff_framesync_init(&scale->fs, ctx, ctx->nb_inputs);
if (ret < 0)
return ret;
scale->fs.on_event = do_scale;
scale->fs.in[0].time_base = ctx->inputs[0]->time_base;
scale->fs.in[0].sync = 1;
scale->fs.in[0].before = EXT_STOP;
scale->fs.in[0].after = EXT_STOP;
if (scale->uses_ref) {
av_assert0(ctx->nb_inputs == 2);
scale->fs.in[1].time_base = ctx->inputs[1]->time_base;
scale->fs.in[1].sync = 0;
scale->fs.in[1].before = EXT_NULL;
scale->fs.in[1].after = EXT_INFINITY;
}
ret = ff_framesync_configure(&scale->fs);
if (ret < 0)
return ret;
}
return 0;
fail:
return ret;
}
static int config_props_ref(AVFilterLink *outlink)
{
AVFilterLink *inlink = outlink->src->inputs[1];
FilterLink *il = ff_filter_link(inlink);
FilterLink *ol = ff_filter_link(outlink);
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->time_base = inlink->time_base;
ol->frame_rate = il->frame_rate;
outlink->colorspace = inlink->colorspace;
outlink->color_range = inlink->color_range;
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;
}
/* Takes over ownership of *frame_in, passes ownership of *frame_out to caller */
static int scale_frame(AVFilterLink *link, AVFrame **frame_in,
AVFrame **frame_out)
{
FilterLink *inl = ff_filter_link(link);
AVFilterContext *ctx = link->dst;
ScaleContext *scale = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out, *in = *frame_in;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
char buf[32];
int ret;
int frame_changed;
*frame_in = 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 ||
in->colorspace != link->colorspace ||
in->color_range != link->color_range;
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]
#if FF_API_FRAME_PKT
|| vars_w[VAR_POS]
#endif
) &&
!(vars_h[VAR_N] || vars_h[VAR_T]
#if FF_API_FRAME_PKT
|| vars_h[VAR_POS]
#endif
) &&
scale->w && scale->h)
goto scale;
if (scale->eval_mode == EVAL_MODE_INIT) {
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);
ret = scale_parse_expr(ctx, NULL, &scale->w_pexpr, "width", scale->w_expr);
if (ret < 0)
goto err;
ret = scale_parse_expr(ctx, NULL, &scale->h_pexpr, "height", scale->h_expr);
if (ret < 0)
goto err;
}
if (ctx->filter == &ff_vf_scale2ref) {
scale->var_values[VAR_S2R_MAIN_N] = inl->frame_count_out;
scale->var_values[VAR_S2R_MAIN_T] = TS2T(in->pts, link->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
scale->var_values[VAR_S2R_MAIN_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
} else {
scale->var_values[VAR_N] = inl->frame_count_out;
scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
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]->colorspace = in->colorspace;
link->dst->inputs[0]->color_range = in->color_range;
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)
goto err;
}
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) {
ret = AVERROR(ENOMEM);
goto err;
}
av_frame_copy_props(out, in);
out->width = outlink->w;
out->height = outlink->h;
out->color_range = outlink->color_range;
out->colorspace = outlink->colorspace;
if (scale->out_chroma_loc != AVCHROMA_LOC_UNSPECIFIED)
out->chroma_location = scale->out_chroma_loc;
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);
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->flags & AV_FRAME_FLAG_INTERLACED))) {
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);
}
if (ret < 0)
av_frame_free(&out);
*frame_out = out;
err:
av_frame_free(&in);
return ret;
}
static int do_scale(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
ScaleContext *scale = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out, *in = NULL, *ref = NULL;
int ret = 0, frame_changed;
ret = ff_framesync_get_frame(fs, 0, &in, 1);
if (ret < 0)
goto err;
if (scale->uses_ref) {
ret = ff_framesync_get_frame(fs, 1, &ref, 0);
if (ret < 0)
goto err;
}
if (ref) {
AVFilterLink *reflink = ctx->inputs[1];
FilterLink *rl = ff_filter_link(reflink);
frame_changed = ref->width != reflink->w ||
ref->height != reflink->h ||
ref->format != reflink->format ||
ref->sample_aspect_ratio.den != reflink->sample_aspect_ratio.den ||
ref->sample_aspect_ratio.num != reflink->sample_aspect_ratio.num ||
ref->colorspace != reflink->colorspace ||
ref->color_range != reflink->color_range;
if (frame_changed) {
reflink->format = ref->format;
reflink->w = ref->width;
reflink->h = ref->height;
reflink->sample_aspect_ratio.num = ref->sample_aspect_ratio.num;
reflink->sample_aspect_ratio.den = ref->sample_aspect_ratio.den;
reflink->colorspace = ref->colorspace;
reflink->color_range = ref->color_range;
ret = config_props(outlink);
if (ret < 0)
goto err;
}
if (scale->eval_mode == EVAL_MODE_FRAME) {
scale->var_values[VAR_REF_N] = rl->frame_count_out;
scale->var_values[VAR_REF_T] = TS2T(ref->pts, reflink->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
scale->var_values[VAR_REF_POS] = ref->pkt_pos == -1 ? NAN : ref->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
}
ret = scale_frame(ctx->inputs[0], &in, &out);
if (ret < 0)
goto err;
av_assert0(out);
out->pts = av_rescale_q(fs->pts, fs->time_base, outlink->time_base);
return ff_filter_frame(outlink, out);
err:
av_frame_free(&in);
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)
{
FilterLink *l = ff_filter_link(link);
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 ||
in->colorspace != link->colorspace ||
in->color_range != link->color_range;
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;
link->colorspace = in->colorspace;
link->color_range = in->color_range;
config_props_ref(outlink);
}
if (scale->eval_mode == EVAL_MODE_FRAME) {
scale->var_values[VAR_N] = l->frame_count_out;
scale->var_values[VAR_T] = TS2T(in->pts, link->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
scale->var_values[VAR_POS] = in->pkt_pos == -1 ? NAN : in->pkt_pos;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
}
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 int activate(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
return ff_framesync_activate(&scale->fs);
}
static const AVClass *child_class_iterate(void **iter)
{
switch ((uintptr_t) *iter) {
case 0:
*iter = (void*)(uintptr_t) 1;
return sws_get_class();
case 1:
*iter = (void*)(uintptr_t) 2;
return &ff_framesync_class;
}
return NULL;
}
static void *child_next(void *obj, void *prev)
{
ScaleContext *s = obj;
if (!prev)
return s->sws_opts;
if (prev == s->sws_opts)
return &s->fs;
return NULL;
}
#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 = FLAGS },
{ "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, .flags = FLAGS },
{ "in_color_matrix", "set input YCbCr type", OFFSET(in_color_matrix), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, AVCOL_SPC_NB-1, .flags = FLAGS, .unit = "color" },
{ "out_color_matrix", "set output YCbCr type", OFFSET(out_color_matrix), AV_OPT_TYPE_INT, { .i64 = AVCOL_SPC_UNSPECIFIED }, 0, AVCOL_SPC_NB-1, .flags = FLAGS, .unit = "color"},
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = -1 }, 0, 0, FLAGS, .unit = "color" },
{ "bt601", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_BT470BG }, 0, 0, FLAGS, .unit = "color" },
{ "bt470", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_BT470BG }, 0, 0, FLAGS, .unit = "color" },
{ "smpte170m", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_BT470BG }, 0, 0, FLAGS, .unit = "color" },
{ "bt709", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_BT709 }, 0, 0, FLAGS, .unit = "color" },
{ "fcc", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_FCC }, 0, 0, FLAGS, .unit = "color" },
{ "smpte240m", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_SMPTE240M }, 0, 0, FLAGS, .unit = "color" },
{ "bt2020", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = AVCOL_SPC_BT2020_NCL }, 0, 0, FLAGS, .unit = "color" },
{ "in_range", "set input color range", OFFSET( in_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, .unit = "range" },
{ "out_range", "set output color range", OFFSET(out_range), AV_OPT_TYPE_INT, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 2, FLAGS, .unit = "range" },
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, .unit = "range" },
{ "unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_UNSPECIFIED }, 0, 0, FLAGS, .unit = "range" },
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, .unit = "range" },
{ "limited",NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, .unit = "range" },
{ "jpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, .unit = "range" },
{ "mpeg", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, .unit = "range" },
{ "tv", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_MPEG}, 0, 0, FLAGS, .unit = "range" },
{ "pc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AVCOL_RANGE_JPEG}, 0, 0, FLAGS, .unit = "range" },
{ "in_chroma_loc", "set input chroma sample location", OFFSET(in_chroma_loc), AV_OPT_TYPE_INT, { .i64 = AVCHROMA_LOC_UNSPECIFIED }, 0, AVCHROMA_LOC_NB-1, .flags = FLAGS, .unit = "chroma_loc" },
{ "out_chroma_loc", "set output chroma sample location", OFFSET(out_chroma_loc), AV_OPT_TYPE_INT, { .i64 = AVCHROMA_LOC_UNSPECIFIED }, 0, AVCHROMA_LOC_NB-1, .flags = FLAGS, .unit = "chroma_loc" },
{"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_UNSPECIFIED}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_UNSPECIFIED}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"left", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_LEFT}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"center", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_CENTER}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"topleft", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_TOPLEFT}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"top", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_TOP}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"bottomleft", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_BOTTOMLEFT}, 0, 0, FLAGS, .unit = "chroma_loc"},
{"bottom", NULL, 0, AV_OPT_TYPE_CONST, {.i64=AVCHROMA_LOC_BOTTOM}, 0, 0, FLAGS, .unit = "chroma_loc"},
{ "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, .unit = "force_oar" },
{ "disable", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 0, FLAGS, .unit = "force_oar" },
{ "decrease", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, FLAGS, .unit = "force_oar" },
{ "increase", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2 }, 0, 0, FLAGS, .unit = "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 = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS },
{ "param1", "Scaler param 1", OFFSET(param[1]), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_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, .unit = "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",
.item_name = av_default_item_name,
.option = scale_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_FILTER,
.child_class_iterate = child_class_iterate,
.child_next = child_next,
};
static const AVFilterPad avfilter_vf_scale_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
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."),
.preinit = preinit,
.init = init,
.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),
.activate = activate,
.process_command = process_command,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};
static const AVClass *scale2ref_child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : sws_get_class();
*iter = (void*)(uintptr_t)c;
return c;
}
static void *scale2ref_child_next(void *obj, void *prev)
{
ScaleContext *s = obj;
if (!prev)
return s->sws_opts;
return NULL;
}
static const AVClass scale2ref_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 = scale2ref_child_class_iterate,
.child_next = scale2ref_child_next,
};
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."),
.preinit = preinit,
.init = init,
.uninit = uninit,
.priv_size = sizeof(ScaleContext),
.priv_class = &scale2ref_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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