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-rw-r--r--tools/ismindex.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/tools/ismindex.c b/tools/ismindex.c
index 387b185feb..f3bfec0a96 100644
--- a/tools/ismindex.c
+++ b/tools/ismindex.c
@@ -228,10 +228,12 @@ fail:
static int64_t read_trun_duration(AVIOContext *in, int default_duration,
int64_t end)
{
- int64_t ret = 0;
+ int64_t dts = 0;
int64_t pos;
int flags, i;
int entries;
+ int64_t first_pts = 0;
+ int64_t max_pts = 0;
avio_r8(in); /* version */
flags = avio_rb24(in);
if (default_duration <= 0 && !(flags & MOV_TRUN_SAMPLE_DURATION)) {
@@ -246,19 +248,23 @@ static int64_t read_trun_duration(AVIOContext *in, int default_duration,
pos = avio_tell(in);
for (i = 0; i < entries && pos < end; i++) {
int sample_duration = default_duration;
+ int64_t pts = dts;
if (flags & MOV_TRUN_SAMPLE_DURATION) sample_duration = avio_rb32(in);
if (flags & MOV_TRUN_SAMPLE_SIZE) avio_rb32(in);
if (flags & MOV_TRUN_SAMPLE_FLAGS) avio_rb32(in);
- if (flags & MOV_TRUN_SAMPLE_CTS) avio_rb32(in);
+ if (flags & MOV_TRUN_SAMPLE_CTS) pts += avio_rb32(in);
if (sample_duration < 0) {
fprintf(stderr, "Negative sample duration %d\n", sample_duration);
return -1;
}
- ret += sample_duration;
+ if (i == 0)
+ first_pts = pts;
+ max_pts = FFMAX(max_pts, pts + sample_duration);
+ dts += sample_duration;
pos = avio_tell(in);
}
- return ret;
+ return max_pts - first_pts;
}
static int64_t read_moof_duration(AVIOContext *in, int64_t offset)