[FFmpeg-devel] [PATCH 1/2] lavc/decode: recreate hw_frames_ctx instead of return if already exists

[Linjie Fu]

If hw_frames_ctx exists when calling ff_decode_get_hw_frames_ctx, it
is allowed to be recreated instead of just return.

Move hw_frames_ctx check outside ff_decode_get_hw_frames_ctx, and check
in relevant code.

Signed-off-by: Linjie Fu <linjie.fu at intel.com>
---
 libavcodec/decode.c | 2 +-
 libavcodec/dxva2.c  | 8 +++++---
 libavcodec/vdpau.c  | 9 +++++----
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 6c31166..0863b82 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -1230,7 +1230,7 @@ int ff_decode_get_hw_frames_ctx(AVCodecContext *avctx,
         return AVERROR(ENOSYS);
 
     if (avctx->hw_frames_ctx)
-        return 0;
+        av_buffer_unref(&avctx->hw_frames_ctx);
     if (!avctx->hw_device_ctx) {
         av_log(avctx, AV_LOG_ERROR, "A hardware frames or device context is "
                 "required for hardware accelerated decoding.\n");
diff --git a/libavcodec/dxva2.c b/libavcodec/dxva2.c
index 3241611..0404064 100644
--- a/libavcodec/dxva2.c
+++ b/libavcodec/dxva2.c
@@ -661,9 +661,11 @@ int ff_dxva2_decode_init(AVCodecContext *avctx)
     // (avctx->pix_fmt is not updated yet at this point)
     sctx->pix_fmt = avctx->hwaccel->pix_fmt;
 
-    ret = ff_decode_get_hw_frames_ctx(avctx, dev_type);
-    if (ret < 0)
-        return ret;
+    if (!avctx->hw_frames_ctx) {
+        ret = ff_decode_get_hw_frames_ctx(avctx, dev_type);
+        if (ret < 0)
+            return ret;
+    }
 
     frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
     sctx->device_ctx = frames_ctx->device_ctx;
diff --git a/libavcodec/vdpau.c b/libavcodec/vdpau.c
index 167f06d..b7a4e9c 100644
--- a/libavcodec/vdpau.c
+++ b/libavcodec/vdpau.c
@@ -178,10 +178,11 @@ int ff_vdpau_common_init(AVCodecContext *avctx, VdpDecoderProfile profile,
         AVHWFramesContext *frames_ctx;
         AVVDPAUDeviceContext *dev_ctx;
 
-        ret = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_VDPAU);
-        if (ret < 0)
-            return ret;
-
+        if (!avctx->hw_frames_ctx) {
+            ret = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_VDPAU);
+            if (ret < 0)
+                return ret;
+        }
         frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
         dev_ctx = frames_ctx->device_ctx->hwctx;
 
-- 
2.7.4