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Use av_compare_ts from libavutil instead of the locale compare_ts, the

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calculations in the later one are not correct with large time stamps.

Originally committed as revision 21744 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2010-02-10 19:43:57 +00:00
parent 4e8052ddad
commit f0cb55af88
1 changed files with 7 additions and 39 deletions
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46
libavformat/seek.c
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@ -47,38 +47,6 @@ typedef struct {
int terminated; ///< termination flag for the current iteration
} AVSyncPoint;
/**
* Compare two timestamps exactly, taking their respective time bases into account.
*
* @param ts_a timestamp A
* @param tb_a time base for timestamp A
* @param ts_b timestamp B
* @param tb_b time base for timestamp A
* @return -1, 0 or 1 if timestamp A is less than, equal or greater than timestamp B
*/
static int compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
{
int64_t a, b, res;
if (ts_a == INT64_MIN)
return ts_a < ts_b ? -1 : 0;
if (ts_a == INT64_MAX)
return ts_a > ts_b ? 1 : 0;
if (ts_b == INT64_MIN)
return ts_a > ts_b ? 1 : 0;
if (ts_b == INT64_MAX)
return ts_a < ts_b ? -1 : 0;
a = ts_a * tb_a.num * tb_b.den;
b = ts_b * tb_b.num * tb_a.den;
res = a - b;
if (!res)
return 0;
else
return (res >> 63) | 1;
}
/**
* Compute a distance between timestamps.
*
@ -216,7 +184,7 @@ static void search_hi_lo_keyframes(AVFormatContext *s,
}
if (sp->term_ts != AV_NOPTS_VALUE &&
compare_ts(ts, ts_tb, sp->term_ts, sp->term_ts_tb) > 0) {
av_compare_ts(ts, ts_tb, sp->term_ts, sp->term_ts_tb) > 0) {
// past the end position from last iteration, ignore packet
if (!sp->terminated) {
sp->terminated = 1;
@ -233,7 +201,7 @@ static void search_hi_lo_keyframes(AVFormatContext *s,
continue;
}
if (compare_ts(ts, ts_tb, timestamp, timebase) <= 0) {
if (av_compare_ts(ts, ts_tb, timestamp, timebase) <= 0) {
// keyframe found before target timestamp
if (sp->pos_lo == INT64_MAX) {
// found first keyframe lower than target timestamp
@ -246,7 +214,7 @@ static void search_hi_lo_keyframes(AVFormatContext *s,
sp->pos_lo = pos;
}
}
if (compare_ts(ts, ts_tb, timestamp, timebase) >= 0) {
if (av_compare_ts(ts, ts_tb, timestamp, timebase) >= 0) {
// keyframe found after target timestamp
if (sp->pos_hi == INT64_MAX) {
// found first keyframe higher than target timestamp
@ -391,15 +359,15 @@ int64_t ff_gen_syncpoint_search(AVFormatContext *s,
min_distance = INT64_MAX;
// Find timestamp closest to requested timestamp within min/max limits.
if (sp->pos_lo != INT64_MAX
&& compare_ts(ts_min, time_base, sp->ts_lo, st->time_base) <= 0
&& compare_ts(sp->ts_lo, st->time_base, ts_max, time_base) <= 0) {
&& av_compare_ts(ts_min, time_base, sp->ts_lo, st->time_base) <= 0
&& av_compare_ts(sp->ts_lo, st->time_base, ts_max, time_base) <= 0) {
// low timestamp is in range
min_distance = ts_distance(ts, time_base, sp->ts_lo, st->time_base);
min_pos = sp->pos_lo;
}
if (sp->pos_hi != INT64_MAX
&& compare_ts(ts_min, time_base, sp->ts_hi, st->time_base) <= 0
&& compare_ts(sp->ts_hi, st->time_base, ts_max, time_base) <= 0) {
&& av_compare_ts(ts_min, time_base, sp->ts_hi, st->time_base) <= 0
&& av_compare_ts(sp->ts_hi, st->time_base, ts_max, time_base) <= 0) {
// high timestamp is in range, check distance
distance = ts_distance(sp->ts_hi, st->time_base, ts, time_base);
if (distance < min_distance) {