+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;
+}
+