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FFmpeg/libavfilter/textutils.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

384 lines
12 KiB
C

/*
* 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/mem.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;
}