From 759001c534287a96dc96d1e274665feb7059145d Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Wed, 21 Nov 2012 21:34:46 +0100
Subject: lavc decoders: work with refcounted frames.

---
 libavcodec/vmdav.c | 38 ++++++++++++++++++--------------------
 1 file changed, 18 insertions(+), 20 deletions(-)

(limited to 'libavcodec/vmdav.c')

diff --git a/libavcodec/vmdav.c b/libavcodec/vmdav.c
index 88cd167659..b5b5524919 100644
--- a/libavcodec/vmdav.c
+++ b/libavcodec/vmdav.c
@@ -59,7 +59,6 @@
 typedef struct VmdVideoContext {
 
     AVCodecContext *avctx;
-    AVFrame frame;
     AVFrame prev_frame;
 
     const unsigned char *buf;
@@ -207,7 +206,7 @@ static int rle_unpack(const unsigned char *src, unsigned char *dest,
     return ps - src;
 }
 
-static void vmd_decode(VmdVideoContext *s)
+static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
 {
     int i;
     unsigned int *palette32;
@@ -257,8 +256,8 @@ static void vmd_decode(VmdVideoContext *s)
         (frame_x || frame_y || (frame_width != s->avctx->width) ||
         (frame_height != s->avctx->height))) {
 
-        memcpy(s->frame.data[0], s->prev_frame.data[0],
-            s->avctx->height * s->frame.linesize[0]);
+        memcpy(frame->data[0], s->prev_frame.data[0],
+            s->avctx->height * frame->linesize[0]);
     }
 
     /* check if there is a new palette */
@@ -288,7 +287,7 @@ static void vmd_decode(VmdVideoContext *s)
             pb_size = s->unpack_buffer_size;
         }
 
-        dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
+        dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
         pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
         switch (meth) {
         case 1:
@@ -320,7 +319,7 @@ static void vmd_decode(VmdVideoContext *s)
                         ofs, frame_width);
                     break;
                 }
-                dp += s->frame.linesize[0];
+                dp += frame->linesize[0];
                 pp += s->prev_frame.linesize[0];
             }
             break;
@@ -332,7 +331,7 @@ static void vmd_decode(VmdVideoContext *s)
                 memcpy(dp, pb, frame_width);
                 pb += frame_width;
                 pb_size -= frame_width;
-                dp += s->frame.linesize[0];
+                dp += frame->linesize[0];
                 pp += s->prev_frame.linesize[0];
             }
             break;
@@ -371,7 +370,7 @@ static void vmd_decode(VmdVideoContext *s)
                     av_log(s->avctx, AV_LOG_ERROR, "VMD video: offset > width (%d > %d)\n",
                         ofs, frame_width);
                 }
-                dp += s->frame.linesize[0];
+                dp += frame->linesize[0];
                 pp += s->prev_frame.linesize[0];
             }
             break;
@@ -425,6 +424,8 @@ static int vmdvideo_decode_frame(AVCodecContext *avctx,
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
     VmdVideoContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    int ret;
 
     s->buf = buf;
     s->size = buf_size;
@@ -432,24 +433,22 @@ static int vmdvideo_decode_frame(AVCodecContext *avctx,
     if (buf_size < 16)
         return buf_size;
 
-    s->frame.reference = 1;
-    if (ff_get_buffer(avctx, &s->frame)) {
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
         av_log(s->avctx, AV_LOG_ERROR, "VMD Video: get_buffer() failed\n");
-        return -1;
+        return ret;
     }
 
-    vmd_decode(s);
+    vmd_decode(s, frame);
 
     /* make the palette available on the way out */
-    memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
+    memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
 
     /* shuffle frames */
-    FFSWAP(AVFrame, s->frame, s->prev_frame);
-    if (s->frame.data[0])
-        avctx->release_buffer(avctx, &s->frame);
+    av_frame_unref(&s->prev_frame);
+    if ((ret = av_frame_ref(&s->prev_frame, frame)) < 0)
+        return ret;
 
     *got_frame      = 1;
-    *(AVFrame*)data = s->prev_frame;
 
     /* report that the buffer was completely consumed */
     return buf_size;
@@ -459,8 +458,7 @@ static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
 {
     VmdVideoContext *s = avctx->priv_data;
 
-    if (s->prev_frame.data[0])
-        avctx->release_buffer(avctx, &s->prev_frame);
+    av_frame_unref(&s->prev_frame);
     av_free(s->unpack_buffer);
 
     return 0;
@@ -607,7 +605,7 @@ static int vmdaudio_decode_frame(AVCodecContext *avctx, void *data,
     /* get output buffer */
     frame->nb_samples = ((silent_chunks + audio_chunks) * avctx->block_align) /
                         avctx->channels;
-    if ((ret = ff_get_buffer(avctx, frame)) < 0) {
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }
-- 
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