[FFmpeg-devel] [PATCH]Read pictures in id3v2

[Carl Eugen Hoyos]

Hi!

Attached patch fixes reading images in id3v2 files for me, only tested with 
one sample.
The difference in the specifications is:
     Attached picture   "PIC"
     Frame size         $xx xx xx
     Text encoding      $xx
     Image format       $xx xx xx
     Picture type       $xx
     Description        <textstring> $00 (00)
     Picture data       <binary data>

vs

<Header for 'Attached picture', ID: "APIC">
Text encoding   $xx
MIME type       <text string> $00
Picture type    $xx
Description     <text string according to encoding> $00 (00)
Picture data    <binary data>

Please comment, Carl Eugen
-------------- next part --------------
diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index 6c82632..99eb823 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -313,7 +313,7 @@ static void read_ttag(AVFormatContext *s, AVIOContext *pb, int taglen,
  * Parse GEOB tag into a ID3v2ExtraMetaGEOB struct.
  */
 static void read_geobtag(AVFormatContext *s, AVIOContext *pb, int taglen,
-                         char *tag, ID3v2ExtraMeta **extra_meta)
+                         char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
 {
     ID3v2ExtraMetaGEOB *geob_data = NULL;
     ID3v2ExtraMeta *new_extra     = NULL;
@@ -445,7 +445,7 @@ static void free_apic(void *obj)
 }
 
 static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen,
-                      char *tag, ID3v2ExtraMeta **extra_meta)
+                      char *tag, ID3v2ExtraMeta **extra_meta, int isv34)
 {
     int enc, pic_type;
     char mimetype[64];
@@ -467,7 +467,11 @@ static void read_apic(AVFormatContext *s, AVIOContext *pb, int taglen,
     taglen--;
 
     /* mimetype */
+    if (isv34) {
     taglen -= avio_get_str(pb, taglen, mimetype, sizeof(mimetype));
+    } else {
+        avio_read(pb, mimetype, 3);
+    }
     while (mime->id != AV_CODEC_ID_NONE) {
         if (!av_strncasecmp(mime->str, mimetype, sizeof(mimetype))) {
             id = mime->id;
@@ -518,7 +522,7 @@ fail:
     avio_seek(pb, end, SEEK_SET);
 }
 
-static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, char *ttag, ID3v2ExtraMeta **extra_meta)
+static void read_chapter(AVFormatContext *s, AVIOContext *pb, int len, char *ttag, ID3v2ExtraMeta **extra_meta, int isv34)
 {
     AVRational time_base = {1, 1000};
     uint32_t start, end;
@@ -569,7 +573,7 @@ typedef struct ID3v2EMFunc {
     const char *tag3;
     const char *tag4;
     void (*read)(AVFormatContext *, AVIOContext *, int, char *,
-                 ID3v2ExtraMeta **);
+                 ID3v2ExtraMeta **, int isv34);
     void (*free)(void *obj);
 } ID3v2EMFunc;
 
@@ -790,7 +794,7 @@ static void id3v2_parse(AVFormatContext *s, int len, uint8_t version,
                 read_ttag(s, pbx, tlen, &s->metadata, tag);
             else
                 /* parse special meta tag */
-                extra_func->read(s, pbx, tlen, tag, extra_meta);
+                extra_func->read(s, pbx, tlen, tag, extra_meta, isv34);
         } else if (!tag[0]) {
             if (tag[1])
                 av_log(s, AV_LOG_WARNING, "invalid frame id, assuming padding\n");