[FFmpeg-cvslog] r15850 - trunk/libavformat/rdt.c

[rbultje]

Author: rbultje
Date: Mon Nov 17 15:23:20 2008
New Revision: 15850

Log:
Fix memleak caused by the fact that url_open_buf() allocates a context
when calling, but url_close_buf() doesn't free it. The better solution
is to not allocate it at all, init it with init_put_byte() and then
not have to close it at all. In the case where we do need to hold it
around for longer than within the function context, we allocate it with
av_alloc_put_byte() and free it with av_free() instead. Discussed in ML
thread "[PATCH] fix small memleak in rdt.c".



Modified:
   trunk/libavformat/rdt.c

Modified: trunk/libavformat/rdt.c
==============================================================================
--- trunk/libavformat/rdt.c	(original)
+++ trunk/libavformat/rdt.c	Mon Nov 17 15:23:20 2008
@@ -115,7 +115,7 @@ ff_rdt_calc_response_and_checksum(char r
 static int
 rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
 {
-    ByteIOContext *pb;
+    ByteIOContext pb;
     int size;
     uint32_t tag;
 
@@ -135,34 +135,34 @@ rdt_load_mdpr (PayloadContext *rdt, AVSt
      */
     if (!rdt->mlti_data)
         return -1;
-    url_open_buf(&pb, rdt->mlti_data, rdt->mlti_data_size, URL_RDONLY);
-    tag = get_le32(pb);
+    init_put_byte(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
+                  NULL, NULL, NULL, NULL);
+    tag = get_le32(&pb);
     if (tag == MKTAG('M', 'L', 'T', 'I')) {
         int num, chunk_nr;
 
         /* read index of MDPR chunk numbers */
-        num = get_be16(pb);
+        num = get_be16(&pb);
         if (rule_nr < 0 || rule_nr >= num)
             return -1;
-        url_fskip(pb, rule_nr * 2);
-        chunk_nr = get_be16(pb);
-        url_fskip(pb, (num - 1 - rule_nr) * 2);
+        url_fskip(&pb, rule_nr * 2);
+        chunk_nr = get_be16(&pb);
+        url_fskip(&pb, (num - 1 - rule_nr) * 2);
 
         /* read MDPR chunks */
-        num = get_be16(pb);
+        num = get_be16(&pb);
         if (chunk_nr >= num)
             return -1;
         while (chunk_nr--)
-            url_fskip(pb, get_be32(pb));
-        size = get_be32(pb);
+            url_fskip(&pb, get_be32(&pb));
+        size = get_be32(&pb);
     } else {
         size = rdt->mlti_data_size;
-        url_fseek(pb, 0, SEEK_SET);
+        url_fseek(&pb, 0, SEEK_SET);
     }
-    if (ff_rm_read_mdpr_codecdata(rdt->rmctx, pb, st, size) < 0)
+    if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, size) < 0)
         return -1;
 
-    url_close_buf(pb);
     return 0;
 }
 
@@ -258,30 +258,30 @@ rdt_parse_packet (PayloadContext *rdt, A
                   const uint8_t *buf, int len, int flags)
 {
     int seq = 1, res;
-    ByteIOContext *pb;
+    ByteIOContext pb;
     RMContext *rm = rdt->rmctx->priv_data;
 
     if (rm->audio_pkt_cnt == 0) {
         int pos;
 
-        url_open_buf (&pb, buf, len, URL_RDONLY);
+        init_put_byte(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
         flags = (flags & PKT_FLAG_KEY) ? 2 : 0;
-        res = ff_rm_parse_packet (rdt->rmctx, pb, st, len, pkt,
+        res = ff_rm_parse_packet (rdt->rmctx, &pb, st, len, pkt,
                                   &seq, &flags, timestamp);
-        pos = url_ftell(pb);
-        url_close_buf (pb);
+        pos = url_ftell(&pb);
         if (res < 0)
             return res;
         if (rm->audio_pkt_cnt > 0 &&
             st->codec->codec_id == CODEC_ID_AAC) {
             memcpy (rdt->buffer, buf + pos, len - pos);
-            url_open_buf (&rdt->rmctx->pb, rdt->buffer, len - pos, URL_RDONLY);
+            rdt->rmctx->pb = av_alloc_put_byte (rdt->buffer, len - pos, 0,
+                                                NULL, NULL, NULL, NULL);
         }
     } else {
         ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb, st, pkt);
         if (rm->audio_pkt_cnt == 0 &&
             st->codec->codec_id == CODEC_ID_AAC)
-            url_close_buf (rdt->rmctx->pb);
+            av_freep(&rdt->rmctx->pb);
     }
     pkt->stream_index = st->index;
     pkt->pts = *timestamp;