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avformat/jacosubdec: clarify code 

add comments, rename variables and indent things differently

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-10-10 19:52:33 +02:00
parent 5ebcca4e08
commit e83e8d443b
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GPG Key ID: B18E8928B3948D64
1 changed files with 9 additions and 9 deletions
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18
libavformat/jacosubdec.c
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@ -128,28 +128,28 @@ shift_and_ret:
static int get_shift(unsigned timeres, const char *buf) static int get_shift(unsigned timeres, const char *buf)
{ {
int sign = 1; int sign = 1;
int a = 0, b = 0, c = 0, d = 0; int h = 0, m = 0, s = 0, d = 0;
int64_t ret; int64_t ret;
#define SSEP "%*1[.:]" #define SSEP "%*1[.:]"
int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d); int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &h, &m, &s, &d);
#undef SSEP #undef SSEP
if (a == INT_MIN) if (h == INT_MIN)
return 0; return 0;
if (*buf == '-' || a < 0) { if (*buf == '-' || h < 0) {
sign = -1; sign = -1;
a = FFABS(a); h = FFABS(h);
} }
ret = 0; ret = 0;
switch (n) { switch (n) {
case 1: a = 0; case 1: h = 0; //clear all in case of a single parameter
case 2: c = b; b = a; a = 0; case 2: s = m; m = h; h = 0; //shift into second subsecondd
case 3: d = c; c = b; b = a; a = 0; case 3: d = s; s = m; m = h; h = 0; //shift into minute second subsecond
} }
ret = (int64_t)a*3600 + (int64_t)b*60 + c; ret = (int64_t)h*3600 + (int64_t)m*60 + s;
if (FFABS(ret) > (INT64_MAX - FFABS(d)) / timeres) if (FFABS(ret) > (INT64_MAX - FFABS(d)) / timeres)
return 0; return 0;
ret = sign * (ret * timeres + d); ret = sign * (ret * timeres + d);