From 04f30711d8d28f35f13318a011c9015b3323445d Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 9 Nov 2013 10:14:46 +0100
Subject: xan: use the AVFrame API properly.

---
 libavcodec/xan.c | 40 +++++++++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 17 deletions(-)

diff --git a/libavcodec/xan.c b/libavcodec/xan.c
index ed2563cc62..4bf1d87f9d 100644
--- a/libavcodec/xan.c
+++ b/libavcodec/xan.c
@@ -52,7 +52,7 @@
 typedef struct XanContext {
 
     AVCodecContext *avctx;
-    AVFrame last_frame;
+    AVFrame *last_frame;
 
     const unsigned char *buf;
     int size;
@@ -71,6 +71,19 @@ typedef struct XanContext {
 
 } XanContext;
 
+static av_cold int xan_decode_end(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    av_frame_free(&s->last_frame);
+
+    av_freep(&s->buffer1);
+    av_freep(&s->buffer2);
+    av_freep(&s->palettes);
+
+    return 0;
+}
+
 static av_cold int xan_decode_init(AVCodecContext *avctx)
 {
     XanContext *s = avctx->priv_data;
@@ -91,6 +104,12 @@ static av_cold int xan_decode_init(AVCodecContext *avctx)
         return AVERROR(ENOMEM);
     }
 
+    s->last_frame = av_frame_alloc();
+    if (!s->last_frame) {
+        xan_decode_end(avctx);
+        return AVERROR(ENOMEM);
+    }
+
     return 0;
 }
 
@@ -234,7 +253,7 @@ static inline void xan_wc3_copy_pixel_run(XanContext *s, AVFrame *frame,
         return;
 
     palette_plane = frame->data[0];
-    prev_palette_plane = s->last_frame.data[0];
+    prev_palette_plane = s->last_frame->data[0];
     if (!prev_palette_plane)
         prev_palette_plane = palette_plane;
     stride = frame->linesize[0];
@@ -582,8 +601,8 @@ static int xan_decode_frame(AVCodecContext *avctx,
     if (xan_wc3_decode_frame(s, frame) < 0)
         return AVERROR_INVALIDDATA;
 
-    av_frame_unref(&s->last_frame);
-    if ((ret = av_frame_ref(&s->last_frame, frame)) < 0)
+    av_frame_unref(s->last_frame);
+    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
         return ret;
 
     *got_frame = 1;
@@ -592,19 +611,6 @@ static int xan_decode_frame(AVCodecContext *avctx,
     return buf_size;
 }
 
-static av_cold int xan_decode_end(AVCodecContext *avctx)
-{
-    XanContext *s = avctx->priv_data;
-
-    av_frame_unref(&s->last_frame);
-
-    av_freep(&s->buffer1);
-    av_freep(&s->buffer2);
-    av_freep(&s->palettes);
-
-    return 0;
-}
-
 AVCodec ff_xan_wc3_decoder = {
     .name           = "xan_wc3",
     .long_name      = NULL_IF_CONFIG_SMALL("Wing Commander III / Xan"),
-- 
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