h264dec: add a NVDEC hwaccel

Some parts of the code are based on a patch by
Timo Rothenpieler <timo@rothenpieler.org>

Merges Libav commit b9129ec4668c511e0a79e25c6f25d748cee172c9.

Due to the name clash with our cuvid decoder, rename it to nvdec.

This commit also changes the Libav code to dynamic loading of the
cuda/cuvid libraries.

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/libavcodec/nvdec.h b/libavcodec/nvdec.h
new file mode 100644
index 0000000..75ed5d4
--- /dev/null
+++ b/libavcodec/nvdec.h
@@ -0,0 +1,62 @@
+/*
+ * HW decode acceleration through NVDEC
+ *
+ * Copyright (c) 2016 Anton Khirnov
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_NVDEC_H
+#define AVCODEC_NVDEC_H
+
+#include "compat/cuda/dynlink_loader.h"
+
+#include <stdint.h>
+
+#include "libavutil/buffer.h"
+#include "libavutil/frame.h"
+
+#include "avcodec.h"
+
+typedef struct NVDECFrame {
+    unsigned int idx;
+    AVBufferRef *idx_ref;
+    AVBufferRef *decoder_ref;
+} NVDECFrame;
+
+typedef struct NVDECContext {
+    CUVIDPICPARAMS pic_params;
+
+    AVBufferPool *decoder_pool;
+
+    AVBufferRef  *decoder_ref;
+
+    uint8_t      *bitstream;
+    int           bitstream_len;
+    unsigned int  bitstream_allocated;
+
+    unsigned     *slice_offsets;
+    int           nb_slices;
+    unsigned int  slice_offsets_allocated;
+} NVDECContext;
+
+int ff_nvdec_decode_init(AVCodecContext *avctx, unsigned int dpb_size);
+int ff_nvdec_decode_uninit(AVCodecContext *avctx);
+int ff_nvdec_start_frame(AVCodecContext *avctx, AVFrame *frame);
+int ff_nvdec_end_frame(AVCodecContext *avctx);
+
+#endif /* AVCODEC_NVDEC_H */