usage example:
AVBufferRef *hwframes_ref;
int ret = avcodec_get_hw_frames_parameters(ctx, hwdev_ref, hwfmt,
&hwframes_ref);
...
ret = av_hwframe_ctx_init(hwframes_ref);
if (ret < 0)
{
av_buffer_unref(&hwframes_ref);
avcodec_reset_hw_frames_parameters(ctx);
return -1;
}
If avcodec_reset_hw_frames_parameters() is not called, it can lead to the
following assert:
Assertion p_dst->hwaccel_threadsafe || (!dst->hwaccel &&
!dst->internal->hwaccel_priv_data) failed at src/libavcodec/pthread_frame.c:426
---
libavcodec/avcodec.h | 15 +++++++++++++++
libavcodec/decode.c | 5 +++++
2 files changed, 20 insertions(+)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 77ca8dee1f..dfea991db9 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2701,6 +2701,21 @@ int avcodec_get_hw_frames_parameters(AVCodecContext
*avctx,
enum AVPixelFormat hw_pix_fmt,
AVBufferRef **out_frames_ref);
+/**
+ * Reset AVCodecContext HW frames internals
+ *
+ * This function can be called after a successful call to
+ * avcodec_get_hw_frames_parameters() in order to reset the HW decoding state.
+ *
+ * It can be used from get_format, to fallback to software decoding after a
+ * failure, not necessarily linked to avcodec_get_hw_frames_parameters()
+ *
+ * @param avctx The context which is currently calling get_format, and which
+ * implicitly contains all state needed for filling the returned
+ * AVHWFramesContext properly.
+ */
+void avcodec_reset_hw_frames_parameters(AVCodecContext *avctx);
+
enum AVCodecConfig {
AV_CODEC_CONFIG_PIX_FORMAT, ///< AVPixelFormat, terminated by
AV_PIX_FMT_NONE
AV_CODEC_CONFIG_FRAME_RATE, ///< AVRational, terminated by {0, 0}
diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index d1e10223f2..5e608076e5 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -1227,6 +1227,11 @@ int avcodec_get_hw_frames_parameters(AVCodecContext
*avctx,
return ret;
}
+void avcodec_reset_hw_frames_parameters(AVCodecContext *avctx)
+{
+ ff_hwaccel_uninit(avctx);
+}
+
static int hwaccel_init(AVCodecContext *avctx,
const FFHWAccel *hwaccel)
{
--
2.45.2
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