matroskadec: add generic metadata support

Originally committed as revision 17331 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/matroskadec.c

@@ -150,6 +150,8 @@ typedef struct {
     char *filename;
     char *mime;
     EbmlBin bin;
+
+    AVStream *stream;
 } MatroskaAttachement;
 
 typedef struct {
@@ -177,6 +179,19 @@ typedef struct {
     EbmlList sub;
 } MatroskaTag;
 
+typedef struct {
+    char    *type;
+    uint64_t typevalue;
+    uint64_t trackuid;
+    uint64_t chapteruid;
+    uint64_t attachuid;
+} MatroskaTagTarget;
+
+typedef struct {
+    MatroskaTagTarget target;
+    EbmlList tag;
+} MatroskaTags;
+
 typedef struct {
     uint64_t id;
     uint64_t pos;
@@ -409,14 +424,23 @@ static EbmlSyntax matroska_simpletag[] = {
     { 0 }
 };
 
+static EbmlSyntax matroska_tagtargets[] = {
+    { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
+    { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
+    { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
+    { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
+    { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
+    { 0 }
+};
+
 static EbmlSyntax matroska_tag[] = {
-    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
-    { MATROSKA_ID_TAGTARGETS,         EBML_NONE },
+    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
+    { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
     { 0 }
 };
 
 static EbmlSyntax matroska_tags[] = {
-    { MATROSKA_ID_TAG,                EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
+    { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
     { 0 }
 };
 
@@ -474,25 +498,6 @@ static EbmlSyntax matroska_clusters[] = {
     { 0 }
 };
 
-#define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
-const struct {
-    const char name[16];
-    int   size;
-    int   offset;
-} metadata[] = {
-    { "TITLE",           SIZE_OFF(title)      },
-    { "ARTIST",          SIZE_OFF(author)     },
-    { "WRITTEN_BY",      SIZE_OFF(author)     },
-    { "LEAD_PERFORMER",  SIZE_OFF(author)     },
-    { "COPYRIGHT",       SIZE_OFF(copyright)  },
-    { "COMMENT",         SIZE_OFF(comment)    },
-    { "ALBUM",           SIZE_OFF(album)      },
-    { "DATE_WRITTEN",    SIZE_OFF(year)       },
-    { "DATE_RELEASED",   SIZE_OFF(year)       },
-    { "PART_NUMBER",     SIZE_OFF(track)      },
-    { "GENRE",           SIZE_OFF(genre)      },
-};
-
 /*
  * Return: Whether we reached the end of a level in the hierarchy or not.
  */
@@ -977,24 +982,50 @@ static void matroska_merge_packets(AVPacket *out, AVPacket *in)
     av_free(in);
 }
 
-static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
+static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
+                                 AVMetadata **metadata, char *prefix)
 {
     MatroskaTag *tags = list->elem;
-    int i, j;
+    char key[1024];
+    int i;
 
     for (i=0; i < list->nb_elem; i++) {
-        for (j=0; j < FF_ARRAY_ELEMS(metadata); j++){
-            if (!strcmp(tags[i].name, metadata[j].name)) {
-                int *ptr = (int *)((char *)s + metadata[j].offset);
-                if (*ptr)  continue;
-                if (metadata[j].size > sizeof(int))
-                    av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
-                else
-                    *ptr = atoi(tags[i].string);
-            }
-        }
+        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
+        else         av_strlcpy(key, tags[i].name, sizeof(key));
+        av_metadata_set(metadata, key, tags[i].string);
         if (tags[i].sub.nb_elem)
-            matroska_convert_tags(s, &tags[i].sub);
+            matroska_convert_tag(s, &tags[i].sub, metadata, key);
+    }
+}
+
+static void matroska_convert_tags(AVFormatContext *s)
+{
+    MatroskaDemuxContext *matroska = s->priv_data;
+    MatroskaTags *tags = matroska->tags.elem;
+    int i, j;
+
+    for (i=0; i < matroska->tags.nb_elem; i++) {
+        if (tags[i].target.attachuid) {
+            MatroskaAttachement *attachment = matroska->attachments.elem;
+            for (j=0; j<matroska->attachments.nb_elem; j++)
+                if (attachment[j].uid == tags[i].target.attachuid)
+                    matroska_convert_tag(s, &tags[i].tag,
+                                         &attachment[j].stream->metadata, NULL);
+        } else if (tags[i].target.chapteruid) {
+            MatroskaChapter *chapter = matroska->chapters.elem;
+            for (j=0; j<matroska->chapters.nb_elem; j++)
+                if (chapter[j].uid == tags[i].target.chapteruid)
+                    matroska_convert_tag(s, &tags[i].tag,
+                                         &chapter[j].chapter->metadata, NULL);
+        } else if (tags[i].target.trackuid) {
+            MatroskaTrack *track = matroska->tracks.elem;
+            for (j=0; j<matroska->tracks.nb_elem; j++)
+                if (track[j].uid == tags[i].target.trackuid)
+                    matroska_convert_tag(s, &tags[i].tag,
+                                         &track[j].stream->metadata, NULL);
+        } else {
+            matroska_convert_tag(s, &tags[i].tag, &s->metadata, NULL);
+        }
     }
 }
 
@@ -1109,7 +1140,6 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
         matroska->ctx->duration = matroska->duration * matroska->time_scale
                                   * 1000 / AV_TIME_BASE;
     av_metadata_set(&s->metadata, "title", matroska->title);
-    matroska_convert_tags(s, &matroska->tags);
 
     tracks = matroska->tracks.elem;
     for (i=0; i < matroska->tracks.nb_elem; i++) {
@@ -1366,6 +1396,7 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
                     break;
                 }
             }
+            attachements[j].stream = st;
         }
     }
 
@@ -1403,6 +1434,8 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
         }
     }
 
+    matroska_convert_tags(s);
+
     return 0;
 }