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/zerocodec.c | 36 ++++++++----------------------------
 1 file changed, 8 insertions(+), 28 deletions(-)

(limited to 'libavcodec/zerocodec.c')

diff --git a/libavcodec/zerocodec.c b/libavcodec/zerocodec.c
index 8122cca3b2..e503aa7689 100644
--- a/libavcodec/zerocodec.c
+++ b/libavcodec/zerocodec.c
@@ -31,14 +31,12 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
                                   int *got_frame, AVPacket *avpkt)
 {
     ZeroCodecContext *zc = avctx->priv_data;
-    AVFrame *pic         = avctx->coded_frame;
+    AVFrame *pic         = data;
     AVFrame *prev_pic    = &zc->previous_frame;
     z_stream *zstream    = &zc->zstream;
     uint8_t *prev        = prev_pic->data[0];
     uint8_t *dst;
-    int i, j, zret;
-
-    pic->reference = 3;
+    int i, j, zret, ret;
 
     if (avpkt->flags & AV_PKT_FLAG_KEY) {
         pic->key_frame = 1;
@@ -61,7 +59,7 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
         return AVERROR_INVALIDDATA;
     }
 
-    if (ff_get_buffer(avctx, pic) < 0) {
+    if (ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF) < 0) {
         av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
         return AVERROR(ENOMEM);
     }
@@ -82,7 +80,6 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
 
         zret = inflate(zstream, Z_SYNC_FLUSH);
         if (zret != Z_OK && zret != Z_STREAM_END) {
-            avctx->release_buffer(avctx, pic);
             av_log(avctx, AV_LOG_ERROR,
                    "Inflate failed with return code: %d.\n", zret);
             return AVERROR_INVALIDDATA;
@@ -96,16 +93,11 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
         dst  -= pic->linesize[0];
     }
 
-    /* Release the previous buffer if need be */
-    if (prev_pic->data[0])
-        avctx->release_buffer(avctx, prev_pic);
+    av_frame_unref(&zc->previous_frame);
+    if ((ret = av_frame_ref(&zc->previous_frame, pic)) < 0)
+        return ret;
 
     *got_frame = 1;
-    *(AVFrame *)data = *pic;
-
-    /* Store the previous frame for use later.
-     * FFSWAP ensures that e.g. pic->data is NULLed. */
-    FFSWAP(AVFrame, *pic, *prev_pic);
 
     return avpkt->size;
 }
@@ -113,15 +105,10 @@ static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
 static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
 {
     ZeroCodecContext *zc = avctx->priv_data;
-    AVFrame *prev_pic    = &zc->previous_frame;
-
-    inflateEnd(&zc->zstream);
 
-    /* Release last frame */
-    if (prev_pic->data[0])
-        avctx->release_buffer(avctx, prev_pic);
+    av_frame_unref(&zc->previous_frame);
 
-    av_freep(&avctx->coded_frame);
+    inflateEnd(&zc->zstream);
 
     return 0;
 }
@@ -145,13 +132,6 @@ static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
         return AVERROR(ENOMEM);
     }
 
-    avctx->coded_frame = avcodec_alloc_frame();
-    if (!avctx->coded_frame) {
-        av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n");
-        zerocodec_decode_close(avctx);
-        return AVERROR(ENOMEM);
-    }
-
     return 0;
 }
 
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