mxfdec: Only sort IndexTableSegments once

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mxfdec.c

@@ -1103,26 +1103,15 @@ static int64_t mxf_essence_container_length(MXFContext *mxf, int body_sid)
     return ret;
 }
 
-static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
+static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st, MXFIndexTableSegment **sorted_segments, int nb_sorted_segments)
 {
     int64_t accumulated_offset = 0;
-    int j, k, l, ret, nb_sorted_segments;
-    MXFIndexTableSegment **sorted_segments = NULL;
+    int j, k, l, ret;
     int n_delta = track_id - 1;  /* TrackID = 1-based stream index */
 
     if (track_id < 1) {
         av_log(mxf->fc, AV_LOG_ERROR, "TrackID not positive: %i\n", track_id);
-        ret = AVERROR_INVALIDDATA;
-        goto err_out;
-    }
-
-    if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)))
-        goto err_out;
-
-    if (nb_sorted_segments <= 0) {
-        av_log(mxf->fc, AV_LOG_WARNING, "Empty index for stream %i\n", st->index);
-        ret = 0;
-        goto err_out;
+        return AVERROR_INVALIDDATA;
     }
 
     for (j = 0; j < nb_sorted_segments; j++) {
@@ -1160,8 +1149,8 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
 
         if (duration <= 0) {
             av_log(mxf->fc, AV_LOG_WARNING, "0 duration in index for stream %i\n", st->index);
-            ret = 0;
-            goto err_out;
+            mxf->broken_index = 1;
+            return 0;
         }
 
         for (k = l = 0; k < duration; k++, l += index_delta) {
@@ -1237,21 +1226,15 @@ static int mxf_parse_index(MXFContext *mxf, int track_id, AVStream *st)
         accumulated_offset += segment_size;
     }
 
-    av_free(sorted_segments);
-
     return 0;
-
-err_out:
-    av_free(sorted_segments);
-    mxf->broken_index = 1;
-    return ret;
 }
 
 static int mxf_parse_structural_metadata(MXFContext *mxf)
 {
     MXFPackage *material_package = NULL;
     MXFPackage *temp_package = NULL;
-    int i, j, k, ret;
+    int i, j, k, ret, nb_sorted_segments;
+    MXFIndexTableSegment **sorted_segments = NULL;
 
     av_dlog(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
     /* TODO: handle multiple material packages (OP3x) */
@@ -1264,6 +1247,12 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
         return -1;
     }
 
+    if ((ret = mxf_get_sorted_table_segments(mxf, &nb_sorted_segments, &sorted_segments)) ||
+        nb_sorted_segments <= 0) {
+        av_log(mxf->fc, AV_LOG_WARNING, "broken or empty index\n");
+        mxf->broken_index = 1;
+    }
+
     for (i = 0; i < material_package->tracks_count; i++) {
         MXFPackage *source_package = NULL;
         MXFTrack *material_track = NULL;
@@ -1309,7 +1298,8 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
             for (k = 0; k < source_package->tracks_count; k++) {
                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
-                    return -1;
+                    ret = -1;
+                    goto fail_and_free;
                 }
                 if (temp_track->track_id == component->source_track_id) {
                     source_track = temp_track;
@@ -1326,7 +1316,8 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
 
         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
-            return -1;
+            ret = -1;
+            goto fail_and_free;
         }
 
         /* 0001GL00.MXF.A1.mxf_opatom.mxf has the same SourcePackageID as 0001GL.MXF.V1.mxf_opatom.mxf
@@ -1339,7 +1330,8 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
         st = avformat_new_stream(mxf->fc, NULL);
         if (!st) {
             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
-            return -1;
+            ret = AVERROR(ENOMEM);
+            goto fail_and_free;
         }
         st->id = source_track->track_id;
         st->priv_data = source_track;
@@ -1438,10 +1430,16 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
             st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
         }
 
-        if ((ret = mxf_parse_index(mxf, material_track->track_id, st)))
-            return ret;
+        if (!mxf->broken_index &&
+            (ret = mxf_parse_index(mxf, material_track->track_id, st, sorted_segments, nb_sorted_segments)))
+            goto fail_and_free;
     }
-    return 0;
+
+    ret = 0;
+
+fail_and_free:
+    av_free(sorted_segments);
+    return ret;
 }
 
 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {