avcodec/hevc: add missing hevc.h header

It was lost as part of a merge in 6397815b.

libavcodec/hevc.h

+/*
+ * HEVC shared code
+ *
+ * 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 AVCODEC_HEVC_H
+#define AVCODEC_HEVC_H
+
+/**
+ * Table 7-3: NAL unit type codes
+ */
+enum HEVCNALUnitType {
+    HEVC_NAL_TRAIL_N    = 0,
+    HEVC_NAL_TRAIL_R    = 1,
+    HEVC_NAL_TSA_N      = 2,
+    HEVC_NAL_TSA_R      = 3,
+    HEVC_NAL_STSA_N     = 4,
+    HEVC_NAL_STSA_R     = 5,
+    HEVC_NAL_RADL_N     = 6,
+    HEVC_NAL_RADL_R     = 7,
+    HEVC_NAL_RASL_N     = 8,
+    HEVC_NAL_RASL_R     = 9,
+    HEVC_NAL_BLA_W_LP   = 16,
+    HEVC_NAL_BLA_W_RADL = 17,
+    HEVC_NAL_BLA_N_LP   = 18,
+    HEVC_NAL_IDR_W_RADL = 19,
+    HEVC_NAL_IDR_N_LP   = 20,
+    HEVC_NAL_CRA_NUT    = 21,
+    HEVC_NAL_VPS        = 32,
+    HEVC_NAL_SPS        = 33,
+    HEVC_NAL_PPS        = 34,
+    HEVC_NAL_AUD        = 35,
+    HEVC_NAL_EOS_NUT    = 36,
+    HEVC_NAL_EOB_NUT    = 37,
+    HEVC_NAL_FD_NUT     = 38,
+    HEVC_NAL_SEI_PREFIX = 39,
+    HEVC_NAL_SEI_SUFFIX = 40,
+};
+
+/**
+ * 7.4.2.1
+ */
+#define HEVC_MAX_SUB_LAYERS 7
+#define HEVC_MAX_VPS_COUNT 16
+#define HEVC_MAX_SPS_COUNT 32
+#define HEVC_MAX_PPS_COUNT 256
+#define HEVC_MAX_SHORT_TERM_RPS_COUNT 64
+#define HEVC_MAX_CU_SIZE 128
+
+#endif /* AVCODEC_HEVC_H */