Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/media/v4l2-h264.h b/include/media/v4l2-h264.h
new file mode 100644
index 0000000000..0d9eaa9561
--- /dev/null
+++ b/include/media/v4l2-h264.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Helper functions for H264 codecs.
+ *
+ * Copyright (c) 2019 Collabora, Ltd.
+ *
+ * Author: Boris Brezillon <boris.brezillon@collabora.com>
+ */
+
+#ifndef _MEDIA_V4L2_H264_H
+#define _MEDIA_V4L2_H264_H
+
+#include <media/v4l2-ctrls.h>
+
+/**
+ * struct v4l2_h264_reflist_builder - Reference list builder object
+ *
+ * @refs.top_field_order_cnt: top field order count
+ * @refs.bottom_field_order_cnt: bottom field order count
+ * @refs.frame_num: reference frame number
+ * @refs.longterm: set to true for a long term reference
+ * @refs: array of references
+ * @cur_pic_order_count: picture order count of the frame being decoded
+ * @cur_pic_fields: fields present in the frame being decoded
+ * @unordered_reflist: unordered list of references. Will be used to generate
+ *		       ordered P/B0/B1 lists
+ * @num_valid: number of valid references in the refs array
+ *
+ * This object stores the context of the P/B0/B1 reference list builder.
+ * This procedure is described in section '8.2.4 Decoding process for reference
+ * picture lists construction' of the H264 spec.
+ */
+struct v4l2_h264_reflist_builder {
+	struct {
+		s32 top_field_order_cnt;
+		s32 bottom_field_order_cnt;
+		int frame_num;
+		u16 longterm : 1;
+	} refs[V4L2_H264_NUM_DPB_ENTRIES];
+
+	s32 cur_pic_order_count;
+	u8 cur_pic_fields;
+
+	struct v4l2_h264_reference unordered_reflist[V4L2_H264_REF_LIST_LEN];
+	u8 num_valid;
+};
+
+void
+v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
+		const struct v4l2_ctrl_h264_decode_params *dec_params,
+		const struct v4l2_ctrl_h264_sps *sps,
+		const struct v4l2_h264_dpb_entry dpb[V4L2_H264_NUM_DPB_ENTRIES]);
+
+/**
+ * v4l2_h264_build_b_ref_lists() - Build the B0/B1 reference lists
+ *
+ * @builder: reference list builder context
+ * @b0_reflist: 32 sized array used to store the B0 reference list. Each entry
+ *		is a v4l2_h264_reference structure
+ * @b1_reflist: 32 sized array used to store the B1 reference list. Each entry
+ *		is a v4l2_h264_reference structure
+ *
+ * This functions builds the B0/B1 reference lists. This procedure is described
+ * in section '8.2.4 Decoding process for reference picture lists construction'
+ * of the H264 spec. This function can be used by H264 decoder drivers that
+ * need to pass B0/B1 reference lists to the hardware.
+ */
+void
+v4l2_h264_build_b_ref_lists(const struct v4l2_h264_reflist_builder *builder,
+			    struct v4l2_h264_reference *b0_reflist,
+			    struct v4l2_h264_reference *b1_reflist);
+
+/**
+ * v4l2_h264_build_p_ref_list() - Build the P reference list
+ *
+ * @builder: reference list builder context
+ * @reflist: 32 sized array used to store the P reference list. Each entry
+ *	     is a v4l2_h264_reference structure
+ *
+ * This functions builds the P reference lists. This procedure is describe in
+ * section '8.2.4 Decoding process for reference picture lists construction'
+ * of the H264 spec. This function can be used by H264 decoder drivers that
+ * need to pass a P reference list to the hardware.
+ */
+void
+v4l2_h264_build_p_ref_list(const struct v4l2_h264_reflist_builder *builder,
+			   struct v4l2_h264_reference *reflist);
+
+#endif /* _MEDIA_V4L2_H264_H */