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Code Issues Releases Activity

avformat/utils: add ff_bprint_get_frame_filename

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2025-08-01 23:17:40 +02:00
parent 7410e29f5d
commit ec64d9b73b
2 changed files with 29 additions and 15 deletions
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14
libavformat/internal.h
View File

@ -640,6 +640,20 @@ int ff_match_url_ext(const char *url, const char *extensions);
int ff_get_frame_filename(char *buf, int buf_size, const char *path, int ff_get_frame_filename(char *buf, int buf_size, const char *path,
int64_t number, int flags); int64_t number, int flags);
/**
* Return in 'buf' the path with '%d' replaced by a number.
*
* Also handles the '%0nd' format where 'n' is the total number
* of digits and '%%'.
*
* @param buf destination buffer
* @param path path with substitution template
* @param number the number to substitute
* @param flags AV_FRAME_FILENAME_FLAGS_*
* @return 0 if OK, <0 on error.
*/
int ff_bprint_get_frame_filename(struct AVBPrint *buf, const char *path, int64_t number, int flags);
/** /**
* Set a dictionary value to an ISO-8601 compliant timestamp string. * Set a dictionary value to an ISO-8601 compliant timestamp string.
* *

30
libavformat/utils.c
View File

@ -283,13 +283,12 @@ uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
return (sec * 1000000) + usec; return (sec * 1000000) + usec;
} }
int ff_get_frame_filename(char *buf, int buf_size, const char *path, int64_t number, int flags) int ff_bprint_get_frame_filename(struct AVBPrint *buf, const char *path, int64_t number, int flags)
{ {
const char *p; const char *p;
char *q, buf1[20], c; char c;
int nd, len, percentd_found; int nd, percentd_found;
q = buf;
p = path; p = path;
percentd_found = 0; percentd_found = 0;
for (;;) { for (;;) {
@ -316,29 +315,30 @@ int ff_get_frame_filename(char *buf, int buf_size, const char *path, int64_t num
percentd_found = 1; percentd_found = 1;
if (number < 0) if (number < 0)
nd += 1; nd += 1;
snprintf(buf1, sizeof(buf1), "%0*" PRId64, nd, number); av_bprintf(buf, "%0*" PRId64, nd, number);
len = strlen(buf1);
if ((q - buf + len) > buf_size - 1)
goto fail;
memcpy(q, buf1, len);
q += len;
break; break;
default: default:
goto fail; goto fail;
} }
} else { } else {
addchar: addchar:
if ((q - buf) < buf_size - 1) av_bprint_chars(buf, c, 1);
*q++ = c;
} }
} }
if (!percentd_found) if (!percentd_found)
goto fail; goto fail;
*q = '\0'; if (!av_bprint_is_complete(buf))
return AVERROR(ENOMEM);
return 0; return 0;
fail: fail:
*q = '\0'; return AVERROR(EINVAL);
return -1; }
int ff_get_frame_filename(char *buf, int buf_size, const char *path, int64_t number, int flags)
{
AVBPrint bp;
av_bprint_init_for_buffer(&bp, buf, buf_size);
return ff_bprint_get_frame_filename(&bp, path, number, flags) < 0 ? -1 : 0;
} }
int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags) int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)