From d5a21172283572af587b3d939eba0091484d3263 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 20 Mar 2003 17:52:30 +0000
Subject: [PATCH] better non conformant divx packed bitstream detection, so
 unpacked (no b frames) divx MPEG4-ES streams can be read

Originally committed as revision 1695 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/h263.c      | 18 ++++++++++++------
 libavcodec/h263dec.c   |  4 ++--
 libavcodec/mpegvideo.h |  1 +
 3 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/libavcodec/h263.c b/libavcodec/h263.c
index b9b94efc9c..76a421a707 100644
--- a/libavcodec/h263.c
+++ b/libavcodec/h263.c
@@ -4566,6 +4566,7 @@ static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
     int i;
     int e;
     int ver, build, ver2, ver3;
+    char last;
 
     buf[0]= show_bits(gb, 8);
     for(i=1; i<256; i++){
@@ -4574,16 +4575,21 @@ static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
         skip_bits(gb, 8);
     }
     buf[255]=0;
-    
+
     /* divx detection */
-    e=sscanf(buf, "DivX%dBuild%d", &ver, &build);
-    if(e!=2)
-        e=sscanf(buf, "DivX%db%d", &ver, &build);
-    if(e==2){
+    e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
+    if(e<2)
+        e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
+    if(e>=2){
         s->divx_version= ver;
         s->divx_build= build;
+        s->divx_packed= e==3 && last=='p';
         if(s->picture_number==0){
-            printf("This file was encoded with DivX%d Build%d\n", ver, build);
+            printf("This file was encoded with DivX%d Build%d", ver, build);
+            if(s->divx_packed)
+                printf("p\n");
+            else
+                printf("\n");
         }
     }
     
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 9c2d26b9b6..2b9443908b 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -128,7 +128,7 @@ int ff_h263_decode_end(AVCodecContext *avctx)
 static int get_consumed_bytes(MpegEncContext *s, int buf_size){
     int pos= (get_bits_count(&s->gb)+7)>>3;
     
-    if(s->divx_version>=500){
+    if(s->divx_packed){
         //we would have to scan through the whole buf to handle the weird reordering ...
         return buf_size; 
     }else if(s->flags&CODEC_FLAG_TRUNCATED){
@@ -675,7 +675,7 @@ retry:
         }
     
     /* divx 5.01+ bistream reorder stuff */
-    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_version>=500){
+    if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0 && s->divx_packed){
         int current_pos= get_bits_count(&s->gb)>>3;
 
         if(   buf_size - current_pos > 5 
diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 83ae0f1697..ab2dd5176c 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -499,6 +499,7 @@ typedef struct MpegEncContext {
     /* divx specific, used to workaround (many) bugs in divx5 */
     int divx_version;
     int divx_build;
+    int divx_packed;
 #define BITSTREAM_BUFFER_SIZE 1024*256
     uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
     int bitstream_buffer_size;