accept old extradata format

Originally committed as revision 4281 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/oggvorbis.c

@@ -180,13 +180,11 @@ AVCodec oggvorbis_encoder = {
     .capabilities= CODEC_CAP_DELAY,
 } ;
 
-
 static int oggvorbis_decode_init(AVCodecContext *avccontext) {
     OggVorbisContext *context = avccontext->priv_data ;
     uint8_t *p= avccontext->extradata;
     int i, hsizes[3];
     unsigned char *headers[3], *extradata = avccontext->extradata;
-    unsigned int offset;
 
     vorbis_info_init(&context->vi) ;
     vorbis_comment_init(&context->vc) ;
@@ -195,12 +193,16 @@ static int oggvorbis_decode_init(AVCodecContext *avccontext) {
         av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
         return -1;
     }
-    if(*p != 2) {
-        av_log(avccontext, AV_LOG_ERROR,
-               "vorbis initial header len is wrong: %d\n", *p);
-        return -1;
+
+    if(p[0] == 0 && p[1] == 30) {
+        for(i = 0; i < 3; i++){
+            hsizes[i] = *p++ << 8;
+            hsizes[i] += *p++;
+            headers[i] = p;
+            p += hsizes[i];
         }
-    offset = 1;
+    } else if(*p == 2) {
+        unsigned int offset = 1;
         p++;
         for(i=0; i<2; i++) {
             hsizes[i] = 0;
@@ -210,7 +212,8 @@ static int oggvorbis_decode_init(AVCodecContext *avccontext) {
                 p++;
             }
             if(offset >= avccontext->extradata_size - 1) {
-            av_log(avccontext, AV_LOG_ERROR, "vorbis header sizes damaged\n");
+                av_log(avccontext, AV_LOG_ERROR,
+                       "vorbis header sizes damaged\n");
                 return -1;
             }
             hsizes[i] += *p;
@@ -226,6 +229,11 @@ static int oggvorbis_decode_init(AVCodecContext *avccontext) {
         headers[0] = extradata + offset;
         headers[1] = extradata + offset + hsizes[0];
         headers[2] = extradata + offset + hsizes[0] + hsizes[1];
+    } else {
+        av_log(avccontext, AV_LOG_ERROR,
+               "vorbis initial header len is wrong: %d\n", *p);
+        return -1;
+    }
 
     for(i=0; i<3; i++){
         context->op.b_o_s= i==0;
@@ -236,6 +244,7 @@ static int oggvorbis_decode_init(AVCodecContext *avccontext) {
             return -1;
         }
     }
+
     avccontext->channels = context->vi.channels;
     avccontext->sample_rate = context->vi.rate;
     avccontext->time_base= (AVRational){1, avccontext->sample_rate};

libavcodec/vorbis.c

@@ -759,17 +759,26 @@ static int vorbis_decode_init(AVCodecContext *avccontext) {
     vorbis_context *vc = avccontext->priv_data ;
     uint8_t *headers = avccontext->extradata;
     int headers_len=avccontext->extradata_size;
+    uint8_t *header_start[3];
     int header_len[3];
     GetBitContext *gb = &(vc->gb);
     int i, j, hdr_type;
 
     vc->avccontext = avccontext;
 
-    if (!headers_len || headers[0]!=2) {
+    if (!headers_len) {
         av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
         return -1;
     }
 
+    if(headers[0] == 0 && headers[1] == 30) {
+        for(i = 0; i < 3; i++){
+            header_len[i] = *headers++ << 8;
+            header_len[i] += *headers++;
+            header_start[i] = headers;
+            headers += header_len[i];
+        }
+    } else if(headers[0] == 2) {
         for(j=1,i=0;i<2;++i, ++j) {
             header_len[i]=0;
             while(j<headers_len && headers[j]==0xff) {
@@ -784,8 +793,15 @@ static int vorbis_decode_init(AVCodecContext *avccontext) {
         }
         header_len[2]=headers_len-header_len[0]-header_len[1]-j;
         headers+=j;
+        header_start[0] = headers;
+        header_start[1] = header_start[0] + header_len[0];
+        header_start[2] = header_start[1] + header_len[1];
+    } else {
+        av_log(avccontext, AV_LOG_ERROR, "Extradata corrupt.\n");
+        return -1;
+    }
 
-    init_get_bits(gb, headers, header_len[0]*8);
+    init_get_bits(gb, header_start[0], header_len[0]*8);
     hdr_type=get_bits(gb, 8);
     if (hdr_type!=1) {
         av_log(avccontext, AV_LOG_ERROR, "First header is not the id header.\n");
@@ -797,7 +813,7 @@ static int vorbis_decode_init(AVCodecContext *avccontext) {
         return -1;
     }
 
-    init_get_bits(gb, headers+header_len[0]+header_len[1], header_len[2]*8);
+    init_get_bits(gb, header_start[2], header_len[2]*8);
     hdr_type=get_bits(gb, 8);
     if (hdr_type!=5) {
         av_log(avccontext, AV_LOG_ERROR, "Third header is not the setup header.\n");