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avformat/matroskadec: Treat SimpleBlock as EBML_BIN

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Up until now, the SimpleBlock was treated specially: It basically had
its own EBML category and it was also included in the BlockGroup EBML
syntax (although a SimpleBlock must not exist in a BlockGroup according
to the Matroska specifications). The latter fact also meant that
a MatroskaBlock's buffer was always unreferenced twice.
This has been changed: The type of a SimpleBlock is now an EBML_BIN.
The only way in which SimpleBlocks are still different is that they
share their associated structure with another unit (namely BlockGroup).
This is also used to unref the block: It is always unreferenced via the
BlockGroup syntax.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2019-05-17 00:30:00 +02:00 committed by James Almer
parent c8232e5007
commit bc3306fd5b
1 changed files with 2 additions and 6 deletions
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8
libavformat/matroskadec.c
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@ -79,7 +79,6 @@ typedef enum {
EBML_BIN,
EBML_NEST,
EBML_LEVEL1,
EBML_PASS,
EBML_STOP,
EBML_SINT,
EBML_TYPE_COUNT
@ -694,7 +693,6 @@ static const EbmlSyntax matroska_blockadditions[] = {
static const EbmlSyntax matroska_blockgroup[] = {
{ MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
{ MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
{ MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
@ -706,7 +704,7 @@ static const EbmlSyntax matroska_blockgroup[] = {
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_PASS, 0, 0, { .n = matroska_blockgroup } },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
{ MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
{ MATROSKA_ID_INFO, EBML_NONE },
@ -1161,7 +1159,7 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
list->nb_elem++;
}
if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
if (syntax->type != EBML_STOP) {
matroska->current_id = 0;
if ((res = ebml_read_length(matroska, pb, &length)) < 0)
return res;
@ -1235,8 +1233,6 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
level1_elem->parsed = 1;
}
return ebml_parse_nest(matroska, syntax->def.n, data);
case EBML_PASS:
return ebml_parse_id(matroska, syntax->def.n, id, data);
case EBML_STOP:
return 1;
default: