From 2c578058313e1f62c9d7e939a0e350eab95af669 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5ns=20Rullg=C3=A5rd?= <mans@mansr.com>
Date: Thu, 19 May 2005 11:45:10 +0000
Subject: accept old extradata format

Originally committed as revision 4281 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/oggvorbis.c | 65 ++++++++++++++++++++++++++++----------------------
 1 file changed, 37 insertions(+), 28 deletions(-)

(limited to 'libavcodec/oggvorbis.c')

diff --git a/libavcodec/oggvorbis.c b/libavcodec/oggvorbis.c
index 9a47aeec97..dc7a8c6ed3 100644
--- a/libavcodec/oggvorbis.c
+++ b/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) ;
@@ -195,37 +193,47 @@ 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;
-    }
-    offset = 1;
-    p++;
-    for(i=0; i<2; i++) {
-        hsizes[i] = 0;
-        while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
-            hsizes[i] += 0xFF;
+
+    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];
+        }
+    } else if(*p == 2) {
+        unsigned int offset = 1;
+        p++;
+        for(i=0; i<2; i++) {
+            hsizes[i] = 0;
+            while((*p == 0xFF) && (offset < avccontext->extradata_size)) {
+                hsizes[i] += 0xFF;
+                offset++;
+                p++;
+            }
+            if(offset >= avccontext->extradata_size - 1) {
+                av_log(avccontext, AV_LOG_ERROR,
+                       "vorbis header sizes damaged\n");
+                return -1;
+            }
+            hsizes[i] += *p;
             offset++;
             p++;
         }
-        if(offset >= avccontext->extradata_size - 1) {
-            av_log(avccontext, AV_LOG_ERROR, "vorbis header sizes damaged\n");
-            return -1;
-        }
-        hsizes[i] += *p;
-        offset++;
-        p++;
-    }
-    hsizes[2] = avccontext->extradata_size - hsizes[0] - hsizes[1] - offset;
+        hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
 #if 0
-    av_log(avccontext, AV_LOG_DEBUG,
-           "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
-           hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
+        av_log(avccontext, AV_LOG_DEBUG,
+               "vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
+               hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
 #endif
-    headers[0] = extradata + offset;
-    headers[1] = extradata + offset + hsizes[0];
-    headers[2] = extradata + offset + hsizes[0] + hsizes[1];
+        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};
-- 
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