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Merge commit '00431bf874e1044b01e09a2266ef85d4ff8d44cc'

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* commit '00431bf874e1044b01e09a2266ef85d4ff8d44cc':
  ismindex: handle time discontinuities and nonzero start time

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-09-15 22:31:43 +02:00
commit 2156161056
1 changed files with 42 additions and 3 deletions
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45
tools/ismindex.c
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@ -254,6 +254,13 @@ static int read_tfra(struct Tracks *tracks, int start_index, AVIOContext *f)
ret = AVERROR(ENOMEM);
goto fail;
}
// The duration here is always the difference between consecutive
// start times and doesn't even try to read the actual duration of the
// media fragments. This is what other smooth streaming tools tend to
// do too, but cannot express missing fragments, and the start times
// may not match the stream metadata we get from libavformat. Correct
// calculation would require parsing the tfxd atom (if present, it's
// not mandatory) or parsing the full moof atoms separately.
for (i = 0; i < track->chunks; i++) {
if (version == 1) {
track->offsets[i].time = avio_rb64(f);
@ -272,9 +279,30 @@ static int read_tfra(struct Tracks *tracks, int start_index, AVIOContext *f)
track->offsets[i - 1].duration = track->offsets[i].time -
track->offsets[i - 1].time;
}
if (track->chunks > 0)
track->offsets[track->chunks - 1].duration = track->duration -
if (track->chunks > 0) {
track->offsets[track->chunks - 1].duration = track->offsets[0].time +
track->duration -
track->offsets[track->chunks - 1].time;
if (track->offsets[track->chunks - 1].duration <= 0) {
fprintf(stderr, "Calculated last chunk duration for track %d "
"was non-positive (%"PRId64"), probably due to missing "
"fragments ", track->track_id,
track->offsets[track->chunks - 1].duration);
if (track->chunks > 1) {
track->offsets[track->chunks - 1].duration =
track->offsets[track->chunks - 2].duration;
} else {
track->offsets[track->chunks - 1].duration = 1;
}
fprintf(stderr, "corrected to %"PRId64"\n",
track->offsets[track->chunks - 1].duration);
track->duration = track->offsets[track->chunks - 1].time +
track->offsets[track->chunks - 1].duration -
track->offsets[0].time;
fprintf(stderr, "Track duration corrected to %"PRId64"\n",
track->duration);
}
}
ret = 0;
fail:
@ -526,6 +554,7 @@ static void print_track_chunks(FILE *out, struct Tracks *tracks, int main,
const char *type)
{
int i, j;
int64_t pos = 0;
struct Track *track = tracks->tracks[main];
int should_print_time_mismatch = 1;
@ -545,8 +574,18 @@ static void print_track_chunks(FILE *out, struct Tracks *tracks, int main,
}
}
}
fprintf(out, "\t\t<c n=\"%d\" d=\"%"PRId64"\" />\n",
fprintf(out, "\t\t<c n=\"%d\" d=\"%"PRId64"\" ",
i, track->offsets[i].duration);
if (pos != track->offsets[i].time) {
// With the current logic for calculation of durations from
// chunk start times, this branch can only be hit on the first
// chunk - but that's still useful and this will keep working
// if the duration calculation is improved.
fprintf(out, "t=\"%"PRId64"\" ", track->offsets[i].time);
pos = track->offsets[i].time;
}
pos += track->offsets[i].duration;
fprintf(out, "/>\n");
}
}