Allow reading of growing avi files (ie currently being written)

This uses the RIFF header stored size to figure out the expected AVI file size, instead
of the actual file. To work fully it requires handling failed avio_seek() instead
of assuming they always succeed.

Some fate file has been cut off and contains half a frame at the end which previously
was not output during demuxing. This frame is now output to encoder, thus fate
diff update.

7 files changed, 10 insertions, 4 deletions

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index f119a1a..db0ed3c 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -157,7 +157,7 @@ static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
     AVIStream *ast;
     int i;
     int64_t last_pos= -1;
-    int64_t filesize= avio_size(s->pb);
+    int64_t filesize= avi->fsize;
 
     av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
             longs_pre_entry,index_type, entries_in_use, chunk_id, base);
@@ -372,7 +372,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
 
     avi->fsize = avio_size(pb);
-    if(avi->fsize<=0)
+    if(avi->fsize<=0 || avi->fsize < avi->riff_end)
         avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
 
     /* first list tag */
@@ -398,7 +398,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
             if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
                 avi->movi_list = avio_tell(pb) - 4;
                 if(size) avi->movi_end = avi->movi_list + size + (size & 1);
-                else     avi->movi_end = avio_size(pb);
+                else     avi->movi_end = avi->fsize;
                 av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
                 goto end_of_header;
             }
@@ -731,7 +731,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
                                         "I will ignore it and try to continue anyway.\n");
                 if (s->error_recognition >= FF_ER_EXPLODE) goto fail;
                 avi->movi_list = avio_tell(pb) - 4;
-                avi->movi_end  = avio_size(pb);
+                avi->movi_end  = avi->fsize;
                 goto end_of_header;
             }
             /* skip tag */
diff --git a/tests/ref/fate/aasc b/tests/ref/fate/aasc
index 7ec02ba..07b3269 100644
--- a/tests/ref/fate/aasc
+++ b/tests/ref/fate/aasc
@@ -21,3 +21,4 @@
 0, 72000, 168000, 0x646fa087
 0, 75600, 168000, 0x404450a2
 0, 79200, 168000, 0x5214c456
+0, 82800, 168000, 0xe573025c
diff --git a/tests/ref/fate/cvid b/tests/ref/fate/cvid
index d7ebe11..9a85275 100644
--- a/tests/ref/fate/cvid
+++ b/tests/ref/fate/cvid
@@ -76,3 +76,4 @@
 0, 562500, 112400, 0xe4394f1f
 0, 570000, 112400, 0x8ca8649f
 0, 577500, 112400, 0x804d44eb
+0, 585000, 112400, 0x3864488b
diff --git a/tests/ref/fate/fraps-v5 b/tests/ref/fate/fraps-v5
index 3fe1c49..05fa9da 100644
--- a/tests/ref/fate/fraps-v5
+++ b/tests/ref/fate/fraps-v5
@@ -56,3 +56,4 @@
 0, 165000, 145152, 0x80448031
 0, 168000, 145152, 0xe3b1fbf7
 0, 171000, 145152, 0xa00395a4
+0, 174000, 145152, 0xdf3b4fce
diff --git a/tests/ref/fate/truemotion1-24 b/tests/ref/fate/truemotion1-24
index b0b1c4e..edca66f 100644
--- a/tests/ref/fate/truemotion1-24
+++ b/tests/ref/fate/truemotion1-24
@@ -30,6 +30,7 @@
 1, 82898, 10832, 0x3c746fbe
 0, 84000, 69120, 0x5876d758
 1, 88424, 10832, 0x05f3b08a
+0, 90000, 69120, 0x45e7dd5c
 1, 93951, 10832, 0xa6560483
 1, 99478, 10832, 0xd98a8e19
 1, 105004, 10832, 0xf98a0b2e
diff --git a/tests/ref/fate/vp5 b/tests/ref/fate/vp5
index bf67801..556d111 100644
--- a/tests/ref/fate/vp5
+++ b/tests/ref/fate/vp5
@@ -244,3 +244,4 @@
 0, 912161, 233472, 0x6f530ac6
 0, 915915, 233472, 0x94f7466c
 0, 919669, 233472, 0xa8c1d365
+0, 923423, 233472, 0xedcff050
diff --git a/tests/ref/fate/zmbv-8bit b/tests/ref/fate/zmbv-8bit
index 258147f..75a212b 100644
--- a/tests/ref/fate/zmbv-8bit
+++ b/tests/ref/fate/zmbv-8bit
@@ -273,3 +273,4 @@
 0, 349284, 192000, 0xd08e49d1
 0, 350568, 192000, 0xd08e49d1
 0, 351852, 192000, 0xd08e49d1
+0, 353136, 192000, 0x1f34135f