#include "cmdutils.h"
#include "libavformat/avformat.h"
+#include "libavformat/isom.h"
#include "libavformat/os_support.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
return ret;
}
+static int64_t read_trun_duration(AVIOContext *in, int default_duration,
+ int64_t end)
+{
+ int64_t ret = 0;
+ int64_t pos;
+ int flags, i;
+ int entries;
+ avio_r8(in); /* version */
+ flags = avio_rb24(in);
+ if (default_duration <= 0 && !(flags & MOV_TRUN_SAMPLE_DURATION)) {
+ fprintf(stderr, "No sample duration in trun flags\n");
+ return -1;
+ }
+ entries = avio_rb32(in);
+
+ if (flags & MOV_TRUN_DATA_OFFSET) avio_rb32(in);
+ if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS) avio_rb32(in);
+
+ pos = avio_tell(in);
+ for (i = 0; i < entries && pos < end; i++) {
+ int sample_duration = default_duration;
+ 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 (sample_duration < 0) {
+ fprintf(stderr, "Negative sample duration %d\n", sample_duration);
+ return -1;
+ }
+ ret += sample_duration;
+ pos = avio_tell(in);
+ }
+
+ return ret;
+}
+
+static int64_t read_moof_duration(AVIOContext *in, int64_t offset)
+{
+ int64_t ret = -1;
+ int32_t moof_size, size, tag;
+ int64_t pos = 0;
+ int default_duration = 0;
+
+ avio_seek(in, offset, SEEK_SET);
+ moof_size = avio_rb32(in);
+ tag = avio_rb32(in);
+ if (expect_tag(tag, MKBETAG('m', 'o', 'o', 'f')) != 0)
+ goto fail;
+ while (pos < offset + moof_size) {
+ pos = avio_tell(in);
+ size = avio_rb32(in);
+ tag = avio_rb32(in);
+ if (tag == MKBETAG('t', 'r', 'a', 'f')) {
+ int64_t traf_pos = pos;
+ int64_t traf_size = size;
+ while (pos < traf_pos + traf_size) {
+ pos = avio_tell(in);
+ size = avio_rb32(in);
+ tag = avio_rb32(in);
+ if (tag == MKBETAG('t', 'f', 'h', 'd')) {
+ int flags = 0;
+ avio_r8(in); /* version */
+ flags = avio_rb24(in);
+ avio_rb32(in); /* track_id */
+ if (flags & MOV_TFHD_BASE_DATA_OFFSET)
+ avio_rb64(in);
+ if (flags & MOV_TFHD_STSD_ID)
+ avio_rb32(in);
+ if (flags & MOV_TFHD_DEFAULT_DURATION)
+ default_duration = avio_rb32(in);
+ }
+ if (tag == MKBETAG('t', 'r', 'u', 'n')) {
+ return read_trun_duration(in, default_duration,
+ pos + size);
+ }
+ avio_seek(in, pos + size, SEEK_SET);
+ }
+ fprintf(stderr, "Couldn't find trun\n");
+ goto fail;
+ }
+ avio_seek(in, pos + size, SEEK_SET);
+ }
+ fprintf(stderr, "Couldn't find traf\n");
+
+fail:
+ return ret;
+}
+
static int read_tfra(struct Tracks *tracks, int start_index, AVIOContext *f)
{
int ret = AVERROR_EOF, track_id;
ret = AVERROR(ENOMEM);
goto fail;
}
+ // The duration here is always the difference between consecutive
+ // start times.
for (i = 0; i < track->chunks; i++) {
if (version == 1) {
track->offsets[i].time = avio_rb64(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;
+ }
+ // Now try and read the actual durations from the trun sample data.
+ for (i = 0; i < track->chunks; i++) {
+ int64_t duration = read_moof_duration(f, track->offsets[i].offset);
+ if (duration > 0 && abs(duration - track->offsets[i].duration) > 3) {
+ // 3 allows for integer duration to drift a few units,
+ // e.g., for 1/3 durations
+ track->offsets[i].duration = duration;
+ }
+ }
+ if (track->chunks > 0) {
+ 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:
const char *type)
{
int i, j;
+ int64_t pos = 0;
struct Track *track = tracks->tracks[main];
int should_print_time_mismatch = 1;
}
}
}
- 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) {
+ fprintf(out, "t=\"%"PRId64"\" ", track->offsets[i].time);
+ pos = track->offsets[i].time;
+ }
+ pos += track->offsets[i].duration;
+ fprintf(out, "/>\n");
}
}
repositories / deb_ffmpeg.git / blobdiff