[FFmpeg-devel,09/21] avformat/matroskadec: Remove non-incremental parsing of clusters

Submitted by Oliver Collyer via ffmpeg-devel on March 27, 2019, 11:18 a.m.

Details

Message ID 20190327111852.3784-10-andreas.rheinhardt@googlemail.com
State New
Headers show

Commit Message

Oliver Collyer via ffmpeg-devel March 27, 2019, 11:18 a.m.
When the new incremental parser was introduced, the old parser was
kept, because the new parser was unable to handle the way SSA packets
are put into Matroska. But since 2014 (since
c7d8dbad14ed5fa3c217a4fc1790021d6c0b6416) this is no longer needed, so
that the old parser can be completely removed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
---
 libavformat/matroskadec.c | 72 ++++++---------------------------------
 1 file changed, 10 insertions(+), 62 deletions(-)

Patch hide | download patch | download mbox

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index aa2266384a..9198fa1bea 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -360,9 +360,6 @@  typedef struct MatroskaDemuxContext {
     int64_t current_cluster_pos;
     MatroskaCluster current_cluster;
 
-    /* File has SSA subtitles which prevent incremental cluster parsing. */
-    int contains_ssa;
-
     /* WebM DASH Manifest live flag */
     int is_live;
 
@@ -707,25 +704,7 @@  static const EbmlSyntax matroska_blockgroup[] = {
     { 0 }
 };
 
-static const EbmlSyntax matroska_cluster[] = {
-    { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0,                     offsetof(MatroskaCluster, timecode) },
-    { MATROSKA_ID_BLOCKGROUP,      EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
-    { MATROSKA_ID_SIMPLEBLOCK,     EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
-    { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
-    { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
-    { 0 }
-};
-
-static const EbmlSyntax matroska_clusters[] = {
-    { MATROSKA_ID_CLUSTER,  EBML_NEST, 0, 0, { .n = matroska_cluster } },
-    { MATROSKA_ID_INFO,     EBML_NONE },
-    { MATROSKA_ID_CUES,     EBML_NONE },
-    { MATROSKA_ID_TAGS,     EBML_NONE },
-    { MATROSKA_ID_SEEKHEAD, EBML_NONE },
-    { 0 }
-};
-
-static const EbmlSyntax matroska_cluster_incremental_parsing[] = {
+static const EbmlSyntax matroska_cluster_parsing[] = {
     { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0,                     offsetof(MatroskaCluster, timecode) },
     { MATROSKA_ID_BLOCKGROUP,      EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
     { MATROSKA_ID_SIMPLEBLOCK,     EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } },
@@ -739,7 +718,7 @@  static const EbmlSyntax matroska_cluster_incremental_parsing[] = {
     { 0 }
 };
 
-static const EbmlSyntax matroska_cluster_incremental[] = {
+static const EbmlSyntax matroska_cluster[] = {
     { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
     { MATROSKA_ID_BLOCKGROUP,      EBML_STOP },
     { MATROSKA_ID_SIMPLEBLOCK,     EBML_STOP },
@@ -748,8 +727,8 @@  static const EbmlSyntax matroska_cluster_incremental[] = {
     { 0 }
 };
 
-static const EbmlSyntax matroska_clusters_incremental[] = {
-    { MATROSKA_ID_CLUSTER,  EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } },
+static const EbmlSyntax matroska_clusters[] = {
+    { MATROSKA_ID_CLUSTER,  EBML_NEST, 0, 0, { .n = matroska_cluster } },
     { MATROSKA_ID_INFO,     EBML_NONE },
     { MATROSKA_ID_CUES,     EBML_NONE },
     { MATROSKA_ID_TAGS,     EBML_NONE },
@@ -2592,8 +2571,6 @@  static int matroska_parse_tracks(AVFormatContext *s)
             }
         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
             st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
-            if (st->codecpar->codec_id == AV_CODEC_ID_ASS)
-                matroska->contains_ssa = 1;
         }
     }
 
@@ -3464,19 +3441,19 @@  end:
     return res;
 }
 
-static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
+static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
 {
     EbmlList *blocks_list;
     MatroskaBlock *blocks;
     int i, res;
     res = ebml_parse(matroska,
-                     matroska_cluster_incremental_parsing,
+                     matroska_cluster_parsing,
                      &matroska->current_cluster);
     if (res == 1) {
         /* New Cluster */
         if (matroska->current_cluster_pos)
             ebml_level_end(matroska);
-        ebml_free(matroska_cluster, &matroska->current_cluster);
+        ebml_free(matroska_cluster_parsing, &matroska->current_cluster);
         memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster));
         matroska->current_cluster_num_blocks = 0;
         matroska->current_cluster_pos        = avio_tell(matroska->ctx->pb);
@@ -3484,12 +3461,12 @@  static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
         if (matroska->current_id)
             matroska->current_cluster_pos -= 4;
         res = ebml_parse(matroska,
-                         matroska_clusters_incremental,
+                         matroska_clusters,
                          &matroska->current_cluster);
         /* Try parsing the block again. */
         if (res == 1)
             res = ebml_parse(matroska,
-                             matroska_cluster_incremental_parsing,
+                             matroska_cluster_parsing,
                              &matroska->current_cluster);
     }
 
@@ -3520,35 +3497,6 @@  static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska)
     return res;
 }
 
-static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
-{
-    MatroskaCluster cluster = { 0 };
-    EbmlList *blocks_list;
-    MatroskaBlock *blocks;
-    int i, res;
-    int64_t pos;
-
-    if (!matroska->contains_ssa)
-        return matroska_parse_cluster_incremental(matroska);
-    pos = avio_tell(matroska->ctx->pb);
-    if (matroska->current_id)
-        pos -= 4;  /* sizeof the ID which was already read */
-    res         = ebml_parse(matroska, matroska_clusters, &cluster);
-    blocks_list = &cluster.blocks;
-    blocks      = blocks_list->elem;
-    for (i = 0; i < blocks_list->nb_elem; i++)
-        if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
-            int is_keyframe = blocks[i].non_simple ? blocks[i].reference == INT64_MIN : -1;
-            res = matroska_parse_block(matroska, blocks[i].bin.buf, blocks[i].bin.data,
-                                       blocks[i].bin.size, blocks[i].bin.pos,
-                                       cluster.timecode, blocks[i].duration,
-                                       is_keyframe, NULL, 0, 0, pos,
-                                       blocks[i].discard_padding);
-        }
-    ebml_free(matroska_cluster, &cluster);
-    return res;
-}
-
 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MatroskaDemuxContext *matroska = s->priv_data;
@@ -3643,7 +3591,7 @@  static int matroska_read_close(AVFormatContext *s)
     for (n = 0; n < matroska->tracks.nb_elem; n++)
         if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
             av_freep(&tracks[n].audio.buf);
-    ebml_free(matroska_cluster, &matroska->current_cluster);
+    ebml_free(matroska_cluster_parsing, &matroska->current_cluster);
     ebml_free(matroska_segment, matroska);
 
     return 0;