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avfilter/scale: separate exprs parse and eval

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Retains parsed expressions which allows for better
error-checking and adding animation support.
This commit is contained in:
Gyan Doshi 2019-12-31 17:10:58 +05:30
parent cc9a7cae76
commit 6310fbd543
2 changed files with 246 additions and 87 deletions
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69
libavfilter/scale_eval.c
View File

@ -54,46 +54,6 @@ enum var_name {
VARS_NB
};
/**
* This must be kept in sync with var_names so that it is always a
* complete list of var_names with the scale2ref specific names
* appended. scale2ref values must appear in the order they appear
* in the var_name_scale2ref enum but also be below all of the
* non-scale2ref specific values.
*/
static const char *const var_names_scale2ref[] = {
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a",
"sar",
"dar",
"hsub",
"vsub",
"ohsub",
"ovsub",
"main_w",
"main_h",
"main_a",
"main_sar",
"main_dar", "mdar",
"main_hsub",
"main_vsub",
NULL
};
enum var_name_scale2ref {
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,
VARS_S2R_NB
};
int ff_scale_eval_dimensions(void *log_ctx,
const char *w_expr, const char *h_expr,
AVFilterLink *inlink, AVFilterLink *outlink,
@ -104,16 +64,7 @@ int ff_scale_eval_dimensions(void *log_ctx,
const char *expr;
int eval_w, eval_h;
int ret;
const char scale2ref = outlink->src->nb_inputs == 2 && outlink->src->inputs[1] == inlink;
double var_values[VARS_NB + VARS_S2R_NB], res;
const AVPixFmtDescriptor *main_desc;
const AVFilterLink *main_link;
const char *const *names = scale2ref ? var_names_scale2ref : var_names;
if (scale2ref) {
main_link = outlink->src->inputs[0];
main_desc = av_pix_fmt_desc_get(main_link->format);
}
double var_values[VARS_NB], res;
var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
@ -128,32 +79,20 @@ int ff_scale_eval_dimensions(void *log_ctx,
var_values[VAR_OHSUB] = 1 << out_desc->log2_chroma_w;
var_values[VAR_OVSUB] = 1 << out_desc->log2_chroma_h;
if (scale2ref) {
var_values[VARS_NB + VAR_S2R_MAIN_W] = main_link->w;
var_values[VARS_NB + VAR_S2R_MAIN_H] = main_link->h;
var_values[VARS_NB + VAR_S2R_MAIN_A] = (double) main_link->w / main_link->h;
var_values[VARS_NB + VAR_S2R_MAIN_SAR] = main_link->sample_aspect_ratio.num ?
(double) main_link->sample_aspect_ratio.num / main_link->sample_aspect_ratio.den : 1;
var_values[VARS_NB + VAR_S2R_MAIN_DAR] = var_values[VARS_NB + VAR_S2R_MDAR] =
var_values[VARS_NB + VAR_S2R_MAIN_A] * var_values[VARS_NB + VAR_S2R_MAIN_SAR];
var_values[VARS_NB + VAR_S2R_MAIN_HSUB] = 1 << main_desc->log2_chroma_w;
var_values[VARS_NB + VAR_S2R_MAIN_VSUB] = 1 << main_desc->log2_chroma_h;
}
/* evaluate width and height */
av_expr_parse_and_eval(&res, (expr = w_expr),
names, var_values,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, log_ctx);
eval_w = var_values[VAR_OUT_W] = var_values[VAR_OW] = (int) res == 0 ? inlink->w : (int) res;
if ((ret = av_expr_parse_and_eval(&res, (expr = h_expr),
names, var_values,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
goto fail;
eval_h = var_values[VAR_OUT_H] = var_values[VAR_OH] = (int) res == 0 ? inlink->h : (int) res;
/* evaluate again the width, as it may depend on the output height */
if ((ret = av_expr_parse_and_eval(&res, (expr = w_expr),
names, var_values,
var_names, var_values,
NULL, NULL, NULL, NULL, NULL, 0, log_ctx)) < 0)
goto fail;
eval_w = (int) res == 0 ? inlink->w : (int) res;

264
libavfilter/vf_scale.c
View File

@ -32,6 +32,7 @@
#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"
@ -41,6 +42,76 @@
#include "libavutil/avassert.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",
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,
VARS_NB
};
/**
* This must be kept in sync with var_names so that it is always a
* complete list of var_names with the scale2ref specific names
* appended. scale2ref values must appear in the order they appear
* in the var_name_scale2ref enum but also be below all of the
* non-scale2ref specific values.
*/
static const char *const var_names_scale2ref[] = {
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
"a",
"sar",
"dar",
"hsub",
"vsub",
"ohsub",
"ovsub",
"main_w",
"main_h",
"main_a",
"main_sar",
"main_dar", "mdar",
"main_hsub",
"main_vsub",
NULL
};
enum var_name_scale2ref {
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,
VARS_S2R_NB
};
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
@ -72,6 +143,10 @@ typedef struct ScaleContext {
char *w_expr; ///< width expression string
char *h_expr; ///< height expression string
AVExpr *w_pexpr;
AVExpr *h_pexpr;
double var_values[VARS_NB + VARS_S2R_NB];
char *flags_str;
char *in_color_matrix;
@ -96,6 +171,59 @@ typedef struct ScaleContext {
AVFilter ff_vf_scale2ref;
static int config_props(AVFilterLink *outlink);
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;
const char scale2ref = ctx->filter == &ff_vf_scale2ref;
const char *const *names = scale2ref ? var_names_scale2ref : var_names;
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, 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;
}
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;
@ -127,6 +255,14 @@ static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
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);
@ -149,6 +285,9 @@ static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
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]);
@ -218,6 +357,81 @@ static const int *parse_yuv_type(const char *s, enum AVColorSpace colorspace)
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[VARS_NB + VAR_S2R_MAIN_W] = main_link->w;
scale->var_values[VARS_NB + VAR_S2R_MAIN_H] = main_link->h;
scale->var_values[VARS_NB + VAR_S2R_MAIN_A] = (double) main_link->w / main_link->h;
scale->var_values[VARS_NB + 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[VARS_NB + VAR_S2R_MAIN_DAR] = scale->var_values[VARS_NB + VAR_S2R_MDAR] =
scale->var_values[VARS_NB + VAR_S2R_MAIN_A] * scale->var_values[VARS_NB + VAR_S2R_MAIN_SAR];
scale->var_values[VARS_NB + VAR_S2R_MAIN_HSUB] = 1 << main_desc->log2_chroma_w;
scale->var_values[VARS_NB + 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;
@ -228,26 +442,23 @@ static int config_props(AVFilterLink *outlink)
enum AVPixelFormat outfmt = outlink->format;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
ScaleContext *scale = ctx->priv;
int w, h;
int ret;
if ((ret = ff_scale_eval_dimensions(ctx,
scale->w_expr, scale->h_expr,
inlink, outlink,
&w, &h)) < 0)
if ((ret = scale_eval_dimensions(ctx)) < 0)
goto fail;
ff_scale_adjust_dimensions(inlink, &w, &h,
ff_scale_adjust_dimensions(inlink, &scale->w, &scale->h,
scale->force_original_aspect_ratio,
scale->force_divisible_by);
if (w > INT_MAX || h > INT_MAX ||
(h * inlink->w) > INT_MAX ||
(w * inlink->h) > INT_MAX)
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 = w;
outlink->h = h;
outlink->w = scale->w;
outlink->h = scale->h;
/* TODO: make algorithm configurable */
@ -421,6 +632,14 @@ static int scale_frame(AVFilterLink *link, AVFrame *in, AVFrame **frame_out)
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;
}
link->dst->inputs[0]->format = in->format;
@ -566,23 +785,24 @@ static int process_command(AVFilterContext *ctx, const char *cmd, const char *ar
char *res, int res_len, int flags)
{
ScaleContext *scale = ctx->priv;
int ret;
char *str_expr;
AVExpr **pexpr_ptr;
int ret, w, h;
if ( !strcmp(cmd, "width") || !strcmp(cmd, "w")
|| !strcmp(cmd, "height") || !strcmp(cmd, "h")) {
w = !strcmp(cmd, "width") || !strcmp(cmd, "w");
h = !strcmp(cmd, "height") || !strcmp(cmd, "h");
int old_w = scale->w;
int old_h = scale->h;
AVFilterLink *outlink = ctx->outputs[0];
if (w || h) {
str_expr = w ? scale->w_expr : scale->h_expr;
pexpr_ptr = w ? &scale->w_pexpr : &scale->h_pexpr;
av_opt_set(scale, cmd, args, 0);
if ((ret = config_props(outlink)) < 0) {
scale->w = old_w;
scale->h = old_h;
}
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;
}