Do not free BITMAPINFOHEADER before we are done using it.

Fixes trac ticket #396.
Completely untested.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavdevice/vfwcap.c

@@ -242,7 +242,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     AVStream *st;
     int devnum;
     int bisize;
-    BITMAPINFO *bi;
+    BITMAPINFO *bi = NULL;
     CAPTUREPARMS cparms;
     DWORD biCompression;
     WORD biBitCount;
@@ -288,7 +288,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
                       (LPARAM) videostream_cb);
     if(!ret) {
         av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
-        goto fail_io;
+        goto fail;
     }
 
     SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
@@ -302,7 +302,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     /* Set video format */
     bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
     if(!bisize)
-        goto fail_io;
+        goto fail;
     bi = av_malloc(bisize);
     if(!bi) {
         vfw_read_close(s);
@@ -310,7 +310,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     }
     ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
     if(!ret)
-        goto fail_bi;
+        goto fail;
 
     dump_bih(s, &bi->bmiHeader);
 
@@ -319,7 +319,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
         ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
         if (ret < 0) {
             av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
-            goto fail_bi;
+            goto fail;
         }
     }
 
@@ -338,19 +338,17 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
     if(!ret) {
         av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
-        goto fail_bi;
+        goto fail;
     }
 
     biCompression = bi->bmiHeader.biCompression;
     biBitCount = bi->bmiHeader.biBitCount;
 
-    av_free(bi);
-
     /* Set sequence setup */
     ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
                       (LPARAM) &cparms);
     if(!ret)
-        goto fail_io;
+        goto fail;
 
     dump_captureparms(s, &cparms);
 
@@ -365,7 +363,7 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
     ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
                       (LPARAM) &cparms);
     if(!ret)
-        goto fail_io;
+        goto fail;
 
     codec = st->codec;
     codec->time_base = (AVRational){framerate_q.den, framerate_q.num};
@@ -394,31 +392,31 @@ static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
         }
     }
 
+    av_freep(&bi);
+
     av_set_pts_info(st, 32, 1, 1000);
 
     ctx->mutex = CreateMutex(NULL, 0, NULL);
     if(!ctx->mutex) {
         av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
-        goto fail_io;
+        goto fail;
     }
     ctx->event = CreateEvent(NULL, 1, 0, NULL);
     if(!ctx->event) {
         av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
-        goto fail_io;
+        goto fail;
     }
 
     ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
     if(!ret) {
         av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
-        goto fail_io;
+        goto fail;
     }
 
     return 0;
 
-fail_bi:
-    av_free(bi);
-
-fail_io:
+fail:
+    av_freep(&bi);
     vfw_read_close(s);
     return AVERROR(EIO);
 }