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lavfi: introduce textutils

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Generalize drawtext utilities to make them usable in other filters.
This will be needed to introduce the QR code source and filter without
duplicating functionality.
This commit is contained in:
Stefano Sabatini 2023-11-20 01:13:17 +01:00
parent c2ab41b7e0
commit 732fb122e6
4 changed files with 743 additions and 403 deletions
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2
libavfilter/Makefile
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@ -291,7 +291,7 @@ OBJS-$(CONFIG_DOUBLEWEAVE_FILTER) += vf_weave.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWGRAPH_FILTER) += f_drawgraph.o
OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o textutils.o
OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o edge_common.o
OBJS-$(CONFIG_ELBG_FILTER) += vf_elbg.o
OBJS-$(CONFIG_ENTROPY_FILTER) += vf_entropy.o

382
libavfilter/textutils.c Normal file
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@ -0,0 +1,382 @@
/*
* 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
* text expansion utilities
*/
#include <fenv.h>
#include <math.h>
#include <string.h>
#include "textutils.h"
#include "libavutil/avutil.h"
#include "libavutil/error.h"
#include "libavutil/file.h"
#include "libavutil/time.h"
static int ff_expand_text_function_internal(FFExpandTextContext *expand_text, AVBPrint *bp,
char *name, unsigned argc, char **argv)
{
void *log_ctx = expand_text->log_ctx;
FFExpandTextFunction *functions = expand_text->functions;
unsigned i;
for (i = 0; i < expand_text->functions_nb; i++) {
if (strcmp(name, functions[i].name))
continue;
if (argc < functions[i].argc_min) {
av_log(log_ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
name, functions[i].argc_min);
return AVERROR(EINVAL);
}
if (argc > functions[i].argc_max) {
av_log(log_ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
name, functions[i].argc_max);
return AVERROR(EINVAL);
}
break;
}
if (i >= expand_text->functions_nb) {
av_log(log_ctx, AV_LOG_ERROR, "%%{%s} is not known\n", name);
return AVERROR(EINVAL);
}
return functions[i].func(log_ctx, bp, name, argc, argv);
}
/**
* Expand text template pointed to by *rtext.
*
* Expand text template defined in text using the logic defined in a text
* expander object.
*
* This function expects the text to be in the format %{FUNCTION_NAME[:PARAMS]},
* where PARAMS is a sequence of strings separated by : and represents the function
* arguments to use for the function evaluation.
*
* @param text_expander TextExpander object used to expand the text
* @param bp BPrint object where the expanded text is written to
* @param rtext pointer to pointer to the text to expand, it is updated to point
* to the next part of the template to process
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
static int ff_expand_text_function(FFExpandTextContext *expand_text, AVBPrint *bp, char **rtext)
{
void *log_ctx = expand_text->log_ctx;
const char *text = *rtext;
char *argv[16] = { NULL };
unsigned argc = 0, i;
int ret;
if (*text != '{') {
av_log(log_ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
return AVERROR(EINVAL);
}
text++;
while (1) {
if (!(argv[argc++] = av_get_token(&text, ":}"))) {
ret = AVERROR(ENOMEM);
goto end;
}
if (!*text) {
av_log(log_ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
ret = AVERROR(EINVAL);
goto end;
}
if (argc == FF_ARRAY_ELEMS(argv))
av_freep(&argv[--argc]); /* error will be caught later */
if (*text == '}')
break;
text++;
}
if ((ret = ff_expand_text_function_internal(expand_text, bp, argv[0], argc - 1, argv + 1)) < 0)
goto end;
ret = 0;
*rtext = (char *)text + 1;
end:
for (i = 0; i < argc; i++)
av_freep(&argv[i]);
return ret;
}
int ff_expand_text(FFExpandTextContext *expand_text, char *text, AVBPrint *bp)
{
int ret;
av_bprint_clear(bp);
if (!text)
return 0;
while (*text) {
if (*text == '\\' && text[1]) {
av_bprint_chars(bp, text[1], 1);
text += 2;
} else if (*text == '%') {
text++;
if ((ret = ff_expand_text_function(expand_text, bp, &text)) < 0)
return ret;
} else {
av_bprint_chars(bp, *text, 1);
text++;
}
}
if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
return 0;
}
int ff_print_pts(void *log_ctx, AVBPrint *bp, double pts, const char *delta,
const char *fmt, const char *strftime_fmt)
{
int ret;
if (delta) {
int64_t delta_i;
if ((ret = av_parse_time(&delta_i, delta, 1)) < 0) {
av_log(log_ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", delta);
return ret;
}
pts += (double)delta_i / AV_TIME_BASE;
}
if (!strcmp(fmt, "flt")) {
av_bprintf(bp, "%.6f", pts);
} else if (!strcmp(fmt, "hms") ||
!strcmp(fmt, "hms24hh")) {
if (isnan(pts)) {
av_bprintf(bp, " ??:??:??.???");
} else {
int64_t ms = llrint(pts * 1000);
char sign = ' ';
if (ms < 0) {
sign = '-';
ms = -ms;
}
if (!strcmp(fmt, "hms24hh")) {
/* wrap around 24 hours */
ms %= 24 * 60 * 60 * 1000;
}
av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
(int)(ms / (60 * 60 * 1000)),
(int)(ms / (60 * 1000)) % 60,
(int)(ms / 1000) % 60,
(int)(ms % 1000));
}
} else if (!strcmp(fmt, "localtime") ||
!strcmp(fmt, "gmtime")) {
struct tm tm;
time_t ms = (time_t)pts;
if (!strcmp(fmt, "localtime"))
localtime_r(&ms, &tm);
else
gmtime_r(&ms, &tm);
av_bprint_strftime(bp, av_x_if_null(strftime_fmt, "%Y-%m-%d %H:%M:%S"), &tm);
} else {
av_log(log_ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
return AVERROR(EINVAL);
}
return 0;
}
int ff_print_time(void *log_ctx, AVBPrint *bp,
const char *strftime_fmt, char localtime)
{
const char *fmt = av_x_if_null(strftime_fmt, "%Y-%m-%d %H:%M:%S");
const char *fmt_begin = fmt;
int64_t unow;
time_t now;
struct tm tm;
const char *begin;
const char *tmp;
int len;
int div;
AVBPrint fmt_bp;
av_bprint_init(&fmt_bp, 0, AV_BPRINT_SIZE_UNLIMITED);
unow = av_gettime();
now = unow / 1000000;
if (localtime)
localtime_r(&now, &tm);
else
tm = *gmtime_r(&now, &tm);
// manually parse format for %N (fractional seconds)
begin = fmt;
while ((begin = strchr(begin, '%'))) {
tmp = begin + 1;
len = 0;
// skip escaped "%%"
if (*tmp == '%') {
begin = tmp + 1;
continue;
}
// count digits between % and possible N
while (*tmp != '\0' && av_isdigit((int)*tmp)) {
len++;
tmp++;
}
// N encountered, insert time
if (*tmp == 'N') {
int num_digits = 3; // default show millisecond [1,6]
// if digit given, expect [1,6], warn & clamp otherwise
if (len == 1) {
num_digits = av_clip(*(begin + 1) - '0', 1, 6);
} else if (len > 1) {
av_log(log_ctx, AV_LOG_WARNING, "Invalid number of decimals for %%N, using default of %i\n", num_digits);
}
len += 2; // add % and N to get length of string part
div = pow(10, 6 - num_digits);
av_bprintf(&fmt_bp, "%.*s%0*d", (int)(begin - fmt_begin), fmt_begin, num_digits, (int)(unow % 1000000) / div);
begin += len;
fmt_begin = begin;
continue;
}
begin = tmp;
}
av_bprintf(&fmt_bp, "%s", fmt_begin);
if (!av_bprint_is_complete(&fmt_bp)) {
av_log(log_ctx, AV_LOG_WARNING, "Format string truncated at %u/%u.", fmt_bp.size, fmt_bp.len);
}
av_bprint_strftime(bp, fmt_bp.str, &tm);
av_bprint_finalize(&fmt_bp, NULL);
return 0;
}
int ff_print_eval_expr(void *log_ctx, AVBPrint *bp,
const char *expr,
const char * const *fun_names, const ff_eval_func2 *fun_values,
const char * const *var_names, const double *var_values,
void *eval_ctx)
{
double res;
int ret;
ret = av_expr_parse_and_eval(&res, expr, var_names, var_values,
NULL, NULL, fun_names, fun_values,
eval_ctx, 0, log_ctx);
if (ret < 0)
av_log(log_ctx, AV_LOG_ERROR,
"Text expansion expression '%s' is not valid\n",
expr);
else
av_bprintf(bp, "%f", res);
return ret;
}
int ff_print_formatted_eval_expr(void *log_ctx, AVBPrint *bp,
const char *expr,
const char * const *fun_names, const ff_eval_func2 *fun_values,
const char * const *var_names, const double *var_values,
void *eval_ctx,
const char format, int positions)
{
double res;
int intval;
int ret;
char fmt_str[30] = "%";
ret = av_expr_parse_and_eval(&res, expr, var_names, var_values,
NULL, NULL, fun_names, fun_values,
eval_ctx, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Text expansion expression '%s' is not valid\n",
expr);
return ret;
}
if (!strchr("xXdu", format)) {
av_log(log_ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
" allowed values: 'x', 'X', 'd', 'u'\n", format);
return AVERROR(EINVAL);
}
feclearexcept(FE_ALL_EXCEPT);
intval = res;
#if defined(FE_INVALID) && defined(FE_OVERFLOW) && defined(FE_UNDERFLOW)
if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
av_log(log_ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
return AVERROR(EINVAL);
}
#endif
if (positions >= 0)
av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
av_strlcatf(fmt_str, sizeof(fmt_str), "%c", format);
av_log(log_ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
res, expr, fmt_str);
av_bprintf(bp, fmt_str, intval);
return 0;
}
int ff_load_textfile(void *log_ctx, const char *textfile,
unsigned char **text, size_t *text_size)
{
int err;
uint8_t *textbuf;
uint8_t *tmp;
size_t textbuf_size;
if ((err = av_file_map(textfile, &textbuf, &textbuf_size, 0, log_ctx)) < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"The text file '%s' could not be read or is empty\n",
textfile);
return err;
}
if (textbuf_size > 0 && ff_is_newline(textbuf[textbuf_size - 1]))
textbuf_size--;
if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(*text, textbuf_size + 1))) {
av_file_unmap(textbuf, textbuf_size);
return AVERROR(ENOMEM);
}
*text = tmp;
memcpy(*text, textbuf, textbuf_size);
(*text)[textbuf_size] = 0;
if (text_size)
*text_size = textbuf_size;
av_file_unmap(textbuf, textbuf_size);
return 0;
}

229
libavfilter/textutils.h Normal file
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@ -0,0 +1,229 @@
/*
* 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
* text utilities
*/
#ifndef AVFILTER_TEXTUTILS_H
#define AVFILTER_TEXTUTILS_H
#include "libavutil/bprint.h"
#include "libavutil/eval.h"
#include "libavutil/log.h"
#include "libavutil/parseutils.h"
/**
* Function used to expand a template sequence in the format
* %{FUNCTION_NAME[:PARAMS]}, defined in the TextExpander object.
*/
typedef struct FFExpandTextFunction {
/**
* name of the function
*/
const char *name;
/**
* minimum and maximum number of arguments accepted by the
* function in the PARAMS
*/
unsigned argc_min, argc_max;
/**
* actual function used to perform the expansion
*/
int (*func)(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **args);
} FFExpandTextFunction;
/**
* Text expander context, used to encapsulate the logic to expand a
* given text template.
*
* A backslash character @samp{\} in a text template, followed by any
* character, always expands to the second character.
* Sequences of the form %{FUNCTION_NAME[:PARAMS]} are expanded using a
* function defined in the object. The text between the braces is a
* function name, possibly followed by arguments separated by ':'. If
* the arguments contain special characters or delimiters (':' or
* '}'), they should be escaped.
*/
typedef struct FFExpandTextContext {
/**
* log context to pass to the function, used for logging and for
* accessing the context for the function
*/
void *log_ctx;
/**
* list of functions to use to expand sequences in the format
* FUNCTION_NAME{PARAMS}
*/
FFExpandTextFunction *functions;
/**
* number of functions
*/
unsigned int functions_nb;
} FFExpandTextContext;
/**
* Expand text template.
*
* Expand text template defined in text using the logic defined in a text
* expander object.
*
* @param expand_text text expansion context used to expand the text
* @param text template text to expand
* @param bp BPrint object where the expanded text is written to
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_expand_text(FFExpandTextContext *expand_text, char *text, AVBPrint *bp);
/**
* Print PTS representation to an AVBPrint object.
*
* @param log_ctx pointer to av_log object
* @param bp AVBPrint object where the PTS textual representation is written to
* @param pts PTS value expressed as a double to represent
* @param delta delta time parsed by av_parse_time(), added to the PTS
* @param fmt string representing the format to use for printing, can be
* "flt" - use a float representation with 6 decimal digits,
* "hms" - use HH:MM:SS.MMM format,
* "hms24hh" - same as "hms" but wraps the hours in 24hh format
* (so that it is expressed in the range 00-23),
* "localtime" or "gmtime" - expand the PTS according to the
* @code{strftime()} function rules, using either the corresponding
* @code{localtime()} or @code{gmtime()} time
* @param strftime_fmt: @code{strftime()} format to use to represent the PTS in
* case the format "localtime" or "gmtime" was selected, if not specified
* defaults to "%Y-%m-%d %H:%M:%S"
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_print_pts(void *log_ctx, AVBPrint *bp, double pts, const char *delta,
const char *fmt, const char *strftime_fmt);
/**
* Print time representation to an AVBPrint object.
*
* @param log_ctx pointer to av_log object
* @param bp AVBPrint object where the time textual representation is written to
* @param strftime_fmt: strftime() format to use to represent the time in case
* if not specified defaults to "%Y-%m-%d %H:%M:%S". The format string is
* extended to support the %[1-6]N after %S which prints fractions of the
* second with optionally specified number of digits, if not specified
* defaults to 3.
* @param localtime use local time to compute the time if non-zero, otherwise
* use UTC
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_print_time(void *log_ctx, AVBPrint *bp, const char *strftime_fmt, char localtime);
typedef double (*ff_eval_func2)(void *, double a, double b);
/**
* Evaluate and print expression to an AVBprint object.
* The output is written as a double representation.
*
* This is a wrapper around av_expr_parse_and_eval() and following the
* same rules.
*
* @param log_ctx pointer to av_log object
* @param bp AVBPrint object where the evaluated expression is written to
* @param expr the expression to be evaluated
* @param fun_names names of the ff_eval_func2 functions used to evaluate the expression
* @param fun_values values of the ff_eval_func2 functions used to evaluate the expression
* @param var_names names of the variables used in the expression
* @param var_values values of the variables used in the expression
* @param eval_ctx evaluation context to be passed to some functions
*
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_print_eval_expr(void *log_ctx, AVBPrint *bp,
const char *expr,
const char * const *fun_names, const ff_eval_func2 *fun_values,
const char * const *var_names, const double *var_values,
void *eval_ctx);
/**
* Evaluate and print expression to an AVBprint object, using the
* specified format.
*
* This is a wrapper around av_expr_parse_and_eval() and following the
* same rules.
*
* The format is specified as a printf format character, optionally
* preceded by the positions numbers for zero-padding.
*
* The following formats are accepted:
* - x: use lowercase hexadecimal representation
* - X: use uppercase hexadecimal representation
* - d: use decimal representation
* - u: use unsigned decimal representation
*
* @param log_ctx pointer to av_log object
* @param bp AVBPrint object where the evaluated expression is written to
* @param expr the expression to be evaluated
* @param fun_names names of the ff_eval_func2 functions used to evaluate the expression
* @param fun_values values of the ff_eval_func2 functions used to evaluate the expression
* @param var_names names of the variables used in the expression
* @param var_values values of the variables used in the expression
* @param eval_ctx evaluation context to be passed to some functions
* @param format a character representing the format, to be chosen in xXdu
* @param positions final size of the value representation with 0-padding
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_print_formatted_eval_expr(void *log_ctx, AVBPrint *bp,
const char *expr,
const char * const *fun_names, const ff_eval_func2 *fun_values,
const char * const *var_names, const double *var_values,
void *eval_ctx,
const char format, int positions);
/**
* Check if the character is a newline.
*
* @param c character to check
* @return non-negative value in case c is a newline, 0 otherwise
*/
static inline int ff_is_newline(uint32_t c)
{
return c == '\n' || c == '\r' || c == '\f' || c == '\v';
}
/**
* Load text file into the buffer pointed by text.
*
* @param log_ctx pointer to av_log object
* @param textfile filename containing the text to load
* @param text pointer to the text buffer where the loaded text will be
* loaded
* @param text_size pointer to the value to set with the loaded text data,
* including the terminating 0 character
* @return negative value corresponding to an AVERROR error code in case of
* errors, a non-negative value otherwise
*/
int ff_load_textfile(void *log_ctx, const char *textfile,
unsigned char **text, size_t *text_size);
#endif /* AVFILTER_TEXTUTILS__H */

533
libavfilter/vf_drawtext.c
View File

@ -47,7 +47,6 @@
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/file.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
@ -62,6 +61,7 @@
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "textutils.h"
#include "video.h"
#if CONFIG_LIBFRIBIDI
@ -253,6 +253,7 @@ typedef struct TextMetrics {
typedef struct DrawTextContext {
const AVClass *class;
int exp_mode; ///< expansion mode to use for the text
FFExpandTextContext expand_text; ///< expand text in case exp_mode == NORMAL
int reinit; ///< tells if the filter is being reinited
#if CONFIG_LIBFONTCONFIG
uint8_t *font; ///< font to be used
@ -631,40 +632,6 @@ static int load_font(AVFilterContext *ctx)
return err;
}
static inline int is_newline(uint32_t c)
{
return c == '\n' || c == '\r' || c == '\f' || c == '\v';
}
static int load_textfile(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
int err;
uint8_t *textbuf;
uint8_t *tmp;
size_t textbuf_size;
if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"The text file '%s' could not be read or is empty\n",
s->textfile);
return err;
}
if (textbuf_size > 0 && is_newline(textbuf[textbuf_size - 1]))
textbuf_size--;
if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) {
av_file_unmap(textbuf, textbuf_size);
return AVERROR(ENOMEM);
}
s->text = tmp;
memcpy(s->text, textbuf, textbuf_size);
s->text[textbuf_size] = 0;
av_file_unmap(textbuf, textbuf_size);
return 0;
}
#if CONFIG_LIBFRIBIDI
static int shape_text(AVFilterContext *ctx)
{
@ -885,6 +852,123 @@ static int string_to_array(const char *source, int *result, int result_size)
return counter;
}
static int func_pict_type(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
return 0;
}
static int func_pts(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
const char *fmt;
const char *strftime_fmt = NULL;
const char *delta = NULL;
double pts = s->var_values[VAR_T];
// argv: pts, FMT, [DELTA, 24HH | strftime_fmt]
fmt = argc >= 1 ? argv[0] : "flt";
if (argc >= 2) {
delta = argv[1];
}
if (argc >= 3) {
if (!strcmp(fmt, "hms")) {
if (!strcmp(argv[2], "24HH")) {
av_log(ctx, AV_LOG_WARNING, "pts third argument 24HH is deprected, use pts:hms24hh instead\n");
fmt = "hms24";
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s', '24HH' was expected\n", argv[2]);
return AVERROR(EINVAL);
}
} else {
strftime_fmt = argv[2];
}
}
return ff_print_pts(ctx, bp, pts, delta, fmt, strftime_fmt);
}
static int func_frame_num(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
return 0;
}
static int func_metadata(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
if (e && e->value)
av_bprintf(bp, "%s", e->value);
else if (argc >= 2)
av_bprintf(bp, "%s", argv[1]);
return 0;
}
static int func_strftime(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
const char *strftime_fmt = argc ? argv[0] : NULL;
return ff_print_time(ctx, bp, strftime_fmt, !strcmp(function_name, "localtime"));
}
static int func_eval_expr(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
return ff_print_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, s->var_values, &s->prng);
}
static int func_eval_expr_int_format(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
int ret;
int positions = -1;
/*
* argv[0] expression to be converted to `int`
* argv[1] format: 'x', 'X', 'd' or 'u'
* argv[2] positions printed (optional)
*/
if (argc == 3) {
ret = sscanf(argv[2], "%u", &positions);
if (ret != 1) {
av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
" to print: '%s'\n", argv[2]);
return AVERROR(EINVAL);
}
}
return ff_print_formatted_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, s->var_values,
&s->prng,
argv[1][0], positions);
}
static FFExpandTextFunction expand_text_functions[] = {
{ "e", 1, 1, func_eval_expr },
{ "eif", 2, 3, func_eval_expr_int_format },
{ "expr", 1, 1, func_eval_expr },
{ "expr_int_format", 2, 3, func_eval_expr_int_format },
{ "frame_num", 0, 0, func_frame_num },
{ "gmtime", 0, 1, func_strftime },
{ "localtime", 0, 1, func_strftime },
{ "metadata", 1, 2, func_metadata },
{ "n", 0, 0, func_frame_num },
{ "pict_type", 0, 0, func_pict_type },
{ "pts", 0, 3, func_pts }
};
static av_cold int init(AVFilterContext *ctx)
{
int err;
@ -907,7 +991,7 @@ static av_cold int init(AVFilterContext *ctx)
"Both text and text file provided. Please provide only one\n");
return AVERROR(EINVAL);
}
if ((err = load_textfile(ctx)) < 0)
if ((err = ff_load_textfile(ctx, (const char *)s->textfile, &s->text, NULL)) < 0)
return err;
}
@ -950,6 +1034,12 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
s->expand_text = (FFExpandTextContext) {
.log_ctx = ctx,
.functions = expand_text_functions,
.functions_nb = FF_ARRAY_ELEMS(expand_text_functions)
};
#if CONFIG_LIBFRIBIDI
if (s->text_shaping)
if ((err = shape_text(ctx)) < 0)
@ -1160,367 +1250,6 @@ fail:
return ret;
}
static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
return 0;
}
static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
const char *fmt;
double pts = s->var_values[VAR_T];
int ret;
fmt = argc >= 1 ? argv[0] : "flt";
if (argc >= 2) {
int64_t delta;
if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);
return ret;
}
pts += (double)delta / AV_TIME_BASE;
}
if (!strcmp(fmt, "flt")) {
av_bprintf(bp, "%.6f", pts);
} else if (!strcmp(fmt, "hms")) {
if (isnan(pts)) {
av_bprintf(bp, " ??:??:??.???");
} else {
int64_t ms = llrint(pts * 1000);
char sign = ' ';
if (ms < 0) {
sign = '-';
ms = -ms;
}
if (argc >= 3) {
if (!strcmp(argv[2], "24HH")) {
ms %= 24 * 60 * 60 * 1000;
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", argv[2]);
return AVERROR(EINVAL);
}
}
av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,
(int)(ms / (60 * 60 * 1000)),
(int)(ms / (60 * 1000)) % 60,
(int)(ms / 1000) % 60,
(int)(ms % 1000));
}
} else if (!strcmp(fmt, "localtime") ||
!strcmp(fmt, "gmtime")) {
struct tm tm;
time_t ms = (time_t)pts;
const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S";
if (!strcmp(fmt, "localtime"))
localtime_r(&ms, &tm);
else
gmtime_r(&ms, &tm);
av_bprint_strftime(bp, timefmt, &tm);
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
return AVERROR(EINVAL);
}
return 0;
}
static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
return 0;
}
static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
if (e && e->value)
av_bprintf(bp, "%s", e->value);
else if (argc >= 2)
av_bprintf(bp, "%s", argv[1]);
return 0;
}
static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
const char *fmt_begin = fmt;
int64_t unow;
time_t now;
struct tm tm;
const char *begin;
const char *tmp;
int len;
int div;
AVBPrint fmt_bp;
av_bprint_init(&fmt_bp, 0, AV_BPRINT_SIZE_UNLIMITED);
unow = av_gettime();
now = unow / 1000000;
if (tag == 'L' || tag == 'm')
localtime_r(&now, &tm);
else
tm = *gmtime_r(&now, &tm);
// manually parse format for %N (fractional seconds)
begin = fmt;
while ((begin = strchr(begin, '%'))) {
tmp = begin + 1;
len = 0;
// skip escaped "%%"
if (*tmp == '%') {
begin = tmp + 1;
continue;
}
// count digits between % and possible N
while (*tmp != '\0' && av_isdigit((int)*tmp)) {
len++;
tmp++;
}
// N encountered, insert time
if (*tmp == 'N') {
int num_digits = 3; // default show millisecond [1,6]
// if digit given, expect [1,6], warn & clamp otherwise
if (len == 1) {
num_digits = av_clip(*(begin + 1) - '0', 1, 6);
} else if (len > 1) {
av_log(ctx, AV_LOG_WARNING, "Invalid number of decimals for %%N, using default of %i\n", num_digits);
}
len += 2; // add % and N to get length of string part
div = pow(10, 6 - num_digits);
av_bprintf(&fmt_bp, "%.*s%0*d", (int)(begin - fmt_begin), fmt_begin, num_digits, (int)(unow % 1000000) / div);
begin += len;
fmt_begin = begin;
continue;
}
begin = tmp;
}
av_bprintf(&fmt_bp, "%s", fmt_begin);
if (!av_bprint_is_complete(&fmt_bp)) {
av_log(ctx, AV_LOG_WARNING, "Format string truncated at %u/%u.", fmt_bp.size, fmt_bp.len);
}
av_bprint_strftime(bp, fmt_bp.str, &tm);
av_bprint_finalize(&fmt_bp, NULL);
return 0;
}
static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
double res;
int ret;
ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
NULL, NULL, fun2_names, fun2,
&s->prng, 0, ctx);
if (ret < 0)
av_log(ctx, AV_LOG_ERROR,
"Expression '%s' for the expr text expansion function is not valid\n",
argv[0]);
else
av_bprintf(bp, "%f", res);
return ret;
}
static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,
char *fct, unsigned argc, char **argv, int tag)
{
DrawTextContext *s = ctx->priv;
double res;
int intval;
int ret;
unsigned int positions = 0;
char fmt_str[30] = "%";
/*
* argv[0] expression to be converted to `int`
* argv[1] format: 'x', 'X', 'd' or 'u'
* argv[2] positions printed (optional)
*/
ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
NULL, NULL, fun2_names, fun2,
&s->prng, 0, ctx);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR,
"Expression '%s' for the expr text expansion function is not valid\n",
argv[0]);
return ret;
}
if (!strchr("xXdu", argv[1][0])) {
av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"
" allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);
return AVERROR(EINVAL);
}
if (argc == 3) {
ret = sscanf(argv[2], "%u", &positions);
if (ret != 1) {
av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"
" to print: '%s'\n", argv[2]);
return AVERROR(EINVAL);
}
}
feclearexcept(FE_ALL_EXCEPT);
intval = res;
#if defined(FE_INVALID) && defined(FE_OVERFLOW) && defined(FE_UNDERFLOW)
if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {
av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);
return AVERROR(EINVAL);
}
#endif
if (argc == 3)
av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);
av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);
av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",
res, argv[0], fmt_str);
av_bprintf(bp, fmt_str, intval);
return 0;
}
static const struct drawtext_function {
const char *name;
unsigned argc_min, argc_max;
int tag; /**< opaque argument to func */
int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
} functions[] = {
{ "expr", 1, 1, 0, func_eval_expr },
{ "e", 1, 1, 0, func_eval_expr },
{ "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
{ "eif", 2, 3, 0, func_eval_expr_int_format },
{ "pict_type", 0, 0, 0, func_pict_type },
{ "pts", 0, 3, 0, func_pts },
{ "gmtime", 0, 1, 'G', func_strftime },
{ "localtime", 0, 1, 'L', func_strftime },
{ "frame_num", 0, 0, 0, func_frame_num },
{ "n", 0, 0, 0, func_frame_num },
{ "metadata", 1, 2, 0, func_metadata },
};
static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
unsigned argc, char **argv)
{
unsigned i;
for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
if (strcmp(fct, functions[i].name))
continue;
if (argc < functions[i].argc_min) {
av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
fct, functions[i].argc_min);
return AVERROR(EINVAL);
}
if (argc > functions[i].argc_max) {
av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
fct, functions[i].argc_max);
return AVERROR(EINVAL);
}
break;
}
if (i >= FF_ARRAY_ELEMS(functions)) {
av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
return AVERROR(EINVAL);
}
return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
}
static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
{
const char *text = *rtext;
char *argv[16] = { NULL };
unsigned argc = 0, i;
int ret;
if (*text != '{') {
av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
return AVERROR(EINVAL);
}
text++;
while (1) {
if (!(argv[argc++] = av_get_token(&text, ":}"))) {
ret = AVERROR(ENOMEM);
goto end;
}
if (!*text) {
av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
ret = AVERROR(EINVAL);
goto end;
}
if (argc == FF_ARRAY_ELEMS(argv))
av_freep(&argv[--argc]); /* error will be caught later */
if (*text == '}')
break;
text++;
}
if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
goto end;
ret = 0;
*rtext = (char *)text + 1;
end:
for (i = 0; i < argc; i++)
av_freep(&argv[i]);
return ret;
}
static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)
{
int ret;
av_bprint_clear(bp);
while (*text) {
if (*text == '\\' && text[1]) {
av_bprint_chars(bp, text[1], 1);
text += 2;
} else if (*text == '%') {
text++;
if ((ret = expand_function(ctx, bp, &text)) < 0)
return ret;
} else {
av_bprint_chars(bp, *text, 1);
text++;
}
}
if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
return 0;
}
static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)
{
*color = incolor;
@ -1688,7 +1417,7 @@ static int measure_text(AVFilterContext *ctx, TextMetrics *metrics)
for (i = 0, p = text; 1; i++) {
GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_failed;);
continue_on_failed:
if (is_newline(code) || code == 0) {
if (ff_is_newline(code) || code == 0) {
++line_count;
if (code == 0) {
break;
@ -1729,7 +1458,7 @@ continue_on_failed:
}
GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_failed2;);
continue_on_failed2:
if (is_newline(code) || code == 0) {
if (ff_is_newline(code) || code == 0) {
TextLine *cur_line = &s->lines[line_count];
HarfbuzzData *hb = &cur_line->hb_data;
cur_line->cluster_offset = line_offset;
@ -1861,7 +1590,7 @@ static int draw_text(AVFilterContext *ctx, AVFrame *frame)
av_bprintf(bp, "%s", s->text);
break;
case EXP_NORMAL:
if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)
if ((ret = ff_expand_text(&s->expand_text, s->text, &s->expanded_text)) < 0)
return ret;
break;
case EXP_STRFTIME:
@ -1883,7 +1612,7 @@ static int draw_text(AVFilterContext *ctx, AVFrame *frame)
if (s->fontcolor_expr[0]) {
/* If expression is set, evaluate and replace the static value */
av_bprint_clear(&s->expanded_fontcolor);
if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
if ((ret = ff_expand_text(&s->expand_text, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)
return ret;
if (!av_bprint_is_complete(&s->expanded_fontcolor))
return AVERROR(ENOMEM);
@ -2125,7 +1854,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
}
if (s->reload && !(inlink->frame_count_out % s->reload)) {
if ((ret = load_textfile(ctx)) < 0) {
if ((ret = ff_load_textfile(ctx, (const char *)s->textfile, &s->text, NULL)) < 0) {
av_frame_free(&frame);
return ret;
}