From 1101abfe775b2efe82964064b68a84a4c81063dc Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <kabi@informatics.muni.cz>
Date: Mon, 11 Nov 2002 09:21:59 +0000
Subject: [PATCH] * cleanup statics & const * some minor initial parsing fixes
 (yet it's very simple parser at this moment)

Originally committed as revision 1189 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libav/avidec.c | 79 ++++++++++++++++++++++++--------------------------
 1 file changed, 38 insertions(+), 41 deletions(-)

diff --git a/libav/avidec.c b/libav/avidec.c
index 80ea928ffa..eb3774eee4 100644
--- a/libav/avidec.c
+++ b/libav/avidec.c
@@ -31,10 +31,11 @@ typedef struct {
     INT64 movi_end;
     offset_t movi_list;
     AVIIndex *first, *last;
+    int framenum;
 } AVIContext;
 
 #ifdef DEBUG
-void print_tag(const char *str, unsigned int tag, int size)
+static void print_tag(const char *str, unsigned int tag, int size)
 {
     printf("%s: tag=%c%c%c%c size=0x%x\n",
            str, tag & 0xff,
@@ -45,7 +46,7 @@ void print_tag(const char *str, unsigned int tag, int size)
 }
 #endif
 
-int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
+static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     AVIContext *avi = s->priv_data;
     ByteIOContext *pb = &s->pb;
@@ -63,11 +64,12 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
     tag = get_le32(pb);
     if (tag != MKTAG('A', 'V', 'I', ' '))
         return -1;
-    
+
     /* first list tag */
     stream_index = -1;
     codec_type = -1;
     frame_period = 0;
+    avi->framenum = 0;
     for(;;) {
         if (url_feof(pb))
             goto fail;
@@ -93,19 +95,18 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
             }
             break;
         case MKTAG('a', 'v', 'i', 'h'):
-            /* avi header */
+	    /* avi header */
+            /* using frame_period is bad idea */
             frame_period = get_le32(pb);
             bit_rate = get_le32(pb) * 8;
-            url_fskip(pb, 4 * 4);
+	    url_fskip(pb, 4 * 4);
             s->nb_streams = get_le32(pb);
             for(i=0;i<s->nb_streams;i++) {
-                AVStream *st;
-                st = av_malloc(sizeof(AVStream));
+                AVStream *st = av_mallocz(sizeof(AVStream));
                 if (!st)
                     goto fail;
-                memset(st, 0, sizeof(AVStream));
                 s->streams[i] = st;
-            }
+	    }
             url_fskip(pb, size - 7 * 4);
             break;
         case MKTAG('s', 't', 'r', 'h'):
@@ -122,16 +123,13 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
                 get_le32(pb); /* XXX: initial frame ? */
                 get_le32(pb); /* scale */
                 get_le32(pb); /* rate */
-                url_fskip(pb, size - 7 * 4);
+                size -= 6 * 4;
                 break;
             case MKTAG('a', 'u', 'd', 's'):
                 codec_type = CODEC_TYPE_AUDIO;
                 /* nothing really useful */
-                url_fskip(pb, size - 4);
-                break;
-            default:
-                goto fail;
             }
+	    url_fskip(pb, size - 4);
             break;
         case MKTAG('s', 't', 'r', 'f'):
             /* stream header */
@@ -159,7 +157,7 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
                     st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
                     url_fskip(pb, size - 5 * 4);
                     break;
-                case CODEC_TYPE_AUDIO:
+		case CODEC_TYPE_AUDIO:
                     get_wav_header(pb, &st->codec, (size >= 18));
                     break;
                 default:
@@ -184,49 +182,48 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
         }
         return -1;
     }
-        
+
     return 0;
 }
 
-int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
+static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AVIContext *avi = s->priv_data;
     ByteIOContext *pb = &s->pb;
     int n, d1, d2, size;
-    
- find_next:
-    if (url_feof(pb) || url_ftell(pb) >= avi->movi_end)
-        return -1;
-    d1 = get_byte(pb);
-    if (d1 < '0' || d1 > '9')
-        goto find_next;
-    d2 = get_byte(pb);
-    if (d2 < '0' || d2 > '9')
-        goto find_next;
-    n = (d1 - '0') * 10 + (d2 - '0');
-    
-    if (n < 0 || n >= s->nb_streams)
-        goto find_next;
-    
-    d1 = get_byte(pb);
-    d2 = get_byte(pb);
-    if ((d1 != 'd' && d2 != 'c') &&
-        (d1 != 'w' && d2 != 'b'))
-        goto find_next;
-    
+
+    for(;;) {
+	if (url_feof(pb) || url_ftell(pb) >= avi->movi_end)
+	    return -1;
+	d1 = get_byte(pb) - '0';
+	d2 = get_byte(pb) - '0';
+	if (d1 < 0 || d1 > 9 || d2 < 0 || d2 > 9)
+	    continue;
+
+	n = d1 * 10 + d2;
+	if (n < 0 || n >= s->nb_streams)
+	    continue;
+
+	d1 = get_byte(pb);
+	d2 = get_byte(pb);
+	if ((d1 == 'd' && d2 == 'c')
+	    || (d1 == 'w' && d2 == 'b'))
+	    break;
+    }
     size = get_le32(pb);
     av_new_packet(pkt, size);
     pkt->stream_index = n;
+    pkt->pts = avi->framenum++;
 
     get_buffer(pb, pkt->data, pkt->size);
-    
+
     if (size & 1)
         get_byte(pb);
-    
+
     return 0;
 }
 
-int avi_read_close(AVFormatContext *s)
+static int avi_read_close(AVFormatContext *s)
 {
     return 0;
 }