avutil: add hwcontext_amf.

Adds  hwcontext_amf, enabling a shared AMF context for encoders,
decoders, and AMF-based filters, without copy to the host memory.
Code also was tested in HandBrake.

Benefits:
 - Optimizations for direct video memory access from CPU
 - Significant performance boost in full AMF pipelines with filters
 - Integration of GPU filters like VPP, Super Resolution, and
    Compression Artefact Removal(in future plans)
 - VCN power management control for decoders.
 - Ability to specify which VCN instance to use for decoding
   (like for encoder)
 - AMD will soon introduce full AMF API for multimedia accelerator MA35D
   - With AMF API, integration will be much easier:
      GPU and the accelerator will have the same API
   - including encoder, decoder, scaler, color converter,
      Windows and Linux.
   Learn more:
      https://www.amd.com/en/products/accelerators/alveo/ma35d.html

Changes by versions:
v2: Header file cleanup.
v3: Removed an unnecessary class.
v4: code cleanup and improved error handling
v5: Fixes related to HandBrake integration.
v6: Sequential filters error and memory leak have been fixed.

1 files changed, 44 insertions, 0 deletions

diff --git a/libavutil/hwcontext_amf_internal.h b/libavutil/hwcontext_amf_internal.h
new file mode 100644
index 0000000000..79e7556bf5
--- /dev/null
+++ b/libavutil/hwcontext_amf_internal.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#ifndef AVUTIL_HWCONTEXT_AMF_INTERNAL_H
+#define AVUTIL_HWCONTEXT_AMF_INTERNAL_H
+#include <AMF/core/Factory.h>
+#include <AMF/core/Context.h>
+
+/**
+* Error handling helper
+*/
+#define AMF_RETURN_IF_FALSE(avctx, exp, ret_value, /*message,*/ ...) \
+    if (!(exp)) { \
+        av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
+        return ret_value; \
+    }
+
+#define AMF_GOTO_FAIL_IF_FALSE(avctx, exp, ret_value, /*message,*/ ...) \
+    if (!(exp)) { \
+        av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
+        ret = ret_value; \
+        goto fail; \
+    }
+
+#define AMF_TIME_BASE_Q          (AVRational){1, AMF_SECOND}
+
+
+#endif /* AVUTIL_HWCONTEXT_AMF_INTERNAL_H */