avformat/matroskadec: Typos, nits and cosmetics

Cosmetics include reordering EbmlType so that EBML_SINT is adjacent to
the other numbers (and matches the order in the switch in ebml_parse)
and also reordering the switch for assignment of default values so that
it matches the order in EbmlType.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/matroskadec.c

@@ -77,6 +77,7 @@
 typedef enum {
     EBML_NONE,
     EBML_UINT,
+    EBML_SINT,
     EBML_FLOAT,
     EBML_STR,
     EBML_UTF8,
@@ -84,7 +85,6 @@ typedef enum {
     EBML_NEST,
     EBML_LEVEL1,
     EBML_STOP,
-    EBML_SINT,
     EBML_TYPE_COUNT
 } EbmlType;
 
@@ -334,8 +334,8 @@ typedef struct MatroskaDemuxContext {
     AVFormatContext *ctx;
 
     /* EBML stuff */
-    int num_levels;
     MatroskaLevel levels[EBML_MAX_DEPTH];
+    int      num_levels;
     uint32_t current_id;
     int64_t  resync_pos;
 
@@ -1076,12 +1076,12 @@ static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
 
     for (i = 0; syntax[i].id; i++)
         switch (syntax[i].type) {
-        case EBML_SINT:
-            *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
-            break;
         case EBML_UINT:
             *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
             break;
+        case EBML_SINT:
+            *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
+            break;
         case EBML_FLOAT:
             *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
             break;
@@ -1176,7 +1176,6 @@ static int ebml_parse(MatroskaDemuxContext *matroska,
     uint64_t length;
     int64_t pos = avio_tell(pb), pos_alt;
     int res, update_pos = 1, level_check;
-    void *newelem;
     MatroskaLevel1Element *level1_elem;
     MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
 
@@ -1232,7 +1231,8 @@ static int ebml_parse(MatroskaDemuxContext *matroska,
     data = (char *) data + syntax->data_offset;
     if (syntax->list_elem_size) {
         EbmlList *list = data;
-        newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
+        void *newelem = av_realloc_array(list->elem, list->nb_elem + 1,
+                                               syntax->list_elem_size);
         if (!newelem)
             return AVERROR(ENOMEM);
         list->elem = newelem;
@@ -1255,8 +1255,6 @@ static int ebml_parse(MatroskaDemuxContext *matroska,
         pos_alt += res;
 
         if (matroska->num_levels > 0) {
-            MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
-
             if (length != EBML_UNKNOWN_LENGTH &&
                 level->length != EBML_UNKNOWN_LENGTH) {
                 uint64_t elem_end = pos_alt + length,
@@ -1729,7 +1727,6 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
 {
     uint32_t saved_id  = matroska->current_id;
     int64_t before_pos = avio_tell(matroska->ctx->pb);
-    MatroskaLevel level;
     int64_t offset;
     int ret = 0;
 
@@ -1744,9 +1741,7 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
                    "cannot parse further.\n", EBML_MAX_DEPTH);
             ret = AVERROR_INVALIDDATA;
         } else {
-            level.start  = 0;
-            level.length = EBML_UNKNOWN_LENGTH;
-            matroska->levels[matroska->num_levels] = level;
+            matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
             matroska->num_levels++;
             matroska->current_id                   = 0;
 
@@ -2778,7 +2773,7 @@ static int matroska_read_header(AVFormatContext *s)
     /* The next thing is a segment. */
     pos = avio_tell(matroska->ctx->pb);
     res = ebml_parse(matroska, matroska_segments, matroska);
-    // try resyncing until we find a EBML_STOP type element.
+    // Try resyncing until we find an EBML_STOP type element.
     while (res != 1) {
         res = matroska_resync(matroska, pos);
         if (res < 0)
@@ -4046,7 +4041,7 @@ static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
     // cues end
     av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
 
-    // if the file has cues at the start, fix up the init range so tht
+    // if the file has cues at the start, fix up the init range so that
     // it does not include it
     if (cues_start <= init_range)
         av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);