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ffmpeg/libavfilter/textutils.c

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/*
* 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;
}
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