1 files changed, 63 insertions, 37 deletions

diff --git a/libavfilter/video.c b/libavfilter/video.c
index 0eed22129a..92b16b2b53 100644
--- a/libavfilter/video.c
+++ b/libavfilter/video.c
@@ -149,13 +149,15 @@ AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, int w, int
     return ret;
 }
 
-void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
     AVFilterBufferRef *buf_out = avfilter_ref_buffer(picref, ~0);
-    ff_start_frame(link->dst->outputs[0], buf_out);
+    if (!buf_out)
+        return AVERROR(ENOMEM);
+    return ff_start_frame(link->dst->outputs[0], buf_out);
 }
 
-static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
 {
     AVFilterLink *outlink = NULL;
 
@@ -163,21 +165,37 @@ static void default_start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
+        AVFilterBufferRef *buf_out;
         outlink->out_buf = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+        if (!outlink->out_buf)
+            return AVERROR(ENOMEM);
+
         avfilter_copy_buffer_ref_props(outlink->out_buf, picref);
         outlink->out_buf->video->w = outlink->w;
         outlink->out_buf->video->h = outlink->h;
-        ff_start_frame(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+        buf_out = avfilter_ref_buffer(outlink->out_buf, ~0);
+        if (!buf_out)
+            return AVERROR(ENOMEM);
+
+        return ff_start_frame(outlink, buf_out);
     }
+    return 0;
+}
+
+static void clear_link(AVFilterLink *link)
+{
+    avfilter_unref_bufferp(&link->cur_buf);
+    avfilter_unref_bufferp(&link->src_buf);
+    avfilter_unref_bufferp(&link->out_buf);
 }
 
 /* XXX: should we do the duplicating of the picture ref here, instead of
  * forcing the source filter to do it? */
-void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
 {
-    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
+    int (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
     AVFilterPad *dst = link->dstpad;
-    int perms = picref->perms;
+    int ret, perms = picref->perms;
     AVFilterCommand *cmd= link->dst->command_queue;
     int64_t pts;
 
@@ -196,6 +214,11 @@ void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
                 link->dstpad->min_perms, link->dstpad->rej_perms);
 
         link->cur_buf = ff_get_video_buffer(link, dst->min_perms, link->w, link->h);
+        if (!link->cur_buf) {
+            avfilter_unref_bufferp(&picref);
+            return AVERROR(ENOMEM);
+        }
+
         link->src_buf = picref;
         avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
 
@@ -215,22 +238,26 @@ void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
         cmd= link->dst->command_queue;
     }
     pts = link->cur_buf->pts;
-    start_frame(link, link->cur_buf);
+    ret = start_frame(link, link->cur_buf);
     ff_update_link_current_pts(link,link->cur_buf ?  link->cur_buf->pts : pts);
+    if (ret < 0)
+        clear_link(link);
+
+    return ret;
 }
 
-void ff_null_start_frame_keep_ref(AVFilterLink *inlink,
+int ff_null_start_frame_keep_ref(AVFilterLink *inlink,
                                                 AVFilterBufferRef *picref)
 {
-    ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
+    return ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
 }
 
-void ff_null_end_frame(AVFilterLink *link)
+int ff_null_end_frame(AVFilterLink *link)
 {
-    ff_end_frame(link->dst->outputs[0]);
+    return ff_end_frame(link->dst->outputs[0]);
 }
 
-static void default_end_frame(AVFilterLink *inlink)
+static int default_end_frame(AVFilterLink *inlink)
 {
     AVFilterLink *outlink = NULL;
 
@@ -238,37 +265,32 @@ static void default_end_frame(AVFilterLink *inlink)
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
-        ff_end_frame(outlink);
+        return ff_end_frame(outlink);
     }
+    return 0;
 }
 
-void ff_end_frame(AVFilterLink *link)
+int ff_end_frame(AVFilterLink *link)
 {
-    void (*end_frame)(AVFilterLink *);
+    int (*end_frame)(AVFilterLink *);
+    int ret;
 
     if (!(end_frame = link->dstpad->end_frame))
         end_frame = default_end_frame;
 
-    end_frame(link);
+    ret = end_frame(link);
 
-    /* unreference the source picture if we're feeding the destination filter
-     * a copied version dues to permission issues */
-    if (link->src_buf) {
-        avfilter_unref_buffer(link->src_buf);
-        link->src_buf = NULL;
-    }
-    if(link->cur_buf != link->out_buf)
-        avfilter_unref_bufferp(&link->cur_buf);
-    link->cur_buf = NULL;
-    avfilter_unref_bufferp(&link->out_buf);
+    clear_link(link);
+
+    return ret;
 }
 
-void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
-    ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
+    return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
 }
 
-static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 {
     AVFilterLink *outlink = NULL;
 
@@ -276,14 +298,15 @@ static void default_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir
         outlink = inlink->dst->outputs[0];
 
     if (outlink)
-        ff_draw_slice(outlink, y, h, slice_dir);
+        return ff_draw_slice(outlink, y, h, slice_dir);
+    return 0;
 }
 
-void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
+int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 {
     uint8_t *src[4], *dst[4];
-    int i, j, vsub;
-    void (*draw_slice)(AVFilterLink *, int, int, int);
+    int i, j, vsub, ret;
+    int (*draw_slice)(AVFilterLink *, int, int, int);
 
     FF_TPRINTF_START(NULL, draw_slice); ff_tlog_link(NULL, link, 0); ff_tlog(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
 
@@ -317,11 +340,14 @@ void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
 
     if (!(draw_slice = link->dstpad->draw_slice))
         draw_slice = default_draw_slice;
-    draw_slice(link, y, h, slice_dir);
+    ret = draw_slice(link, y, h, slice_dir);
+    if (ret < 0)
+        clear_link(link);
+    return ret;
 }
 
-void avfilter_default_end_frame(AVFilterLink *inlink)
+int avfilter_default_end_frame(AVFilterLink *inlink)
 {
-    default_end_frame(inlink);
+    return default_end_frame(inlink);
 }