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avformat/matroskadec: Combine arrays 

By including SimpleBlocks and BlockGroups twice in the same EbmlSyntax
array (with different semantics), one can reduce the duplication of the
other values.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-05-17 00:30:10 +02:00 committed by James Almer
parent a9f051519e
commit 38255cdcf8
1 changed files with 8 additions and 10 deletions
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18
libavformat/matroskadec.c
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@ -716,26 +716,21 @@ static const EbmlSyntax matroska_blockgroup[] = {
CHILD_OF(matroska_cluster_parsing)
};
// The following array contains SimpleBlock and BlockGroup twice
// in order to reuse the other values for matroska_cluster_enter.
static const EbmlSyntax matroska_cluster_parsing[] = {
{ MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
{ MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
{ MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
CHILD_OF(matroska_segment)
};
static const EbmlSyntax matroska_cluster_initial[] = {
{ MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
{ MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
{ MATROSKA_ID_BLOCKGROUP, EBML_STOP },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
{ MATROSKA_ID_BLOCKGROUP, EBML_STOP },
{ MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
{ MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
CHILD_OF(matroska_segment)
};
static const EbmlSyntax matroska_cluster_enter[] = {
{ MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_initial } },
{ MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
{ 0 }
};
@ -1063,6 +1058,9 @@ static int ebml_parse(MatroskaDemuxContext *matroska,
static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
{
int i;
// Whoever touches this should be aware of the duplication
// existing in matroska_cluster_parsing.
for (i = 0; syntax[i].id; i++)
if (id == syntax[i].id)
break;