From: Loren Merritt <pengvado@videolan.org>
Date: Sat, 5 Mar 2005 09:34:53 +0000 (+0000)
Subject: avc2avi:
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d0bd44f769543e81280a5a97bbe985c6dfd86cf1;p=libx264

avc2avi:
Use POC to determine frame boundaries (frame_num couldn't distinguish consecutive B-frames).
Fix keyframe flag to mark IDR only, not all I slices.


git-svn-id: svn://svn.videolan.org/x264/trunk@153 df754926-b1dd-0310-bc7b-ec298dee348c
---

diff --git a/tools/avc2avi.c b/tools/avc2avi.c
index 36f11c44..7f868094 100644
--- a/tools/avc2avi.c
+++ b/tools/avc2avi.c
@@ -130,9 +130,12 @@ typedef struct
     int i_ref_idc;
     int i_idr_pic_id;
     int i_frame_num;
+    int i_poc;
 
     int b_key;
     int i_log2_max_frame_num;
+    int i_poc_type;
+    int i_log2_max_poc_lsb;
 } h264_t;
 
 void h264_parser_init( h264_t * );
@@ -432,6 +435,8 @@ void h264_parser_init( h264_t *h )
     h->i_idr_pic_id = -1;
     h->i_frame_num = -1;
     h->i_log2_max_frame_num = 0;
+    h->i_poc = -1;
+    h->i_poc_type = -1;
 }
 void h264_parser_parse( h264_t *h, nal_t *nal, int *pb_nal_start )
 {
@@ -452,13 +457,12 @@ void h264_parser_parse( h264_t *h, nal_t *nal, int *pb_nal_start )
         /* Skip i_log2_max_frame_num */
         h->i_log2_max_frame_num = bs_read_ue( &s ) + 4;
         /* Read poc_type */
-        i_tmp = bs_read_ue( &s );
-        if( i_tmp == 0 )
+        h->i_poc_type = bs_read_ue( &s );
+        if( h->i_poc_type == 0 )
         {
-            /* skip i_log2_max_poc_lsb */
-            bs_read_ue( &s );
+            h->i_log2_max_poc_lsb = bs_read_ue( &s ) + 4;
         }
-        else if( i_tmp == 1 )
+        else if( h->i_poc_type == 1 )
         {
             int i_cycle;
             /* skip b_delta_pic_order_always_zero */
@@ -525,10 +529,8 @@ void h264_parser_parse( h264_t *h, nal_t *nal, int *pb_nal_start )
                 h->b_key = 0;
                 break;
             case 2: case 7: /* I */
-                h->b_key = 1;
-                break;
-            case 4: case 9: /* ? */
-                h->b_key = 1;
+            case 4: case 9: /* SI */
+                h->b_key = (nal->i_type == NAL_SLICE_IDR);
                 break;
         }
         /* pps id */
@@ -550,6 +552,14 @@ void h264_parser_parse( h264_t *h, nal_t *nal, int *pb_nal_start )
 
             h->i_idr_pic_id = i_tmp;
         }
+
+        if( h->i_poc_type == 0 )
+        {
+            i_tmp = bs_read( &s, h->i_log2_max_poc_lsb );
+            if( i_tmp != h->i_poc )
+                *pb_nal_start = 1;
+            h->i_poc = i_tmp;
+        }
     }
     h->i_nal_type = nal->i_type;
     h->i_ref_idc = nal->i_ref_idc;