lavc/h265: Add some common code for profile/tier/level handling

Adds support for determining for level limits, including mapping PTL
blocks to profiles to check profile-dependent level limits.

1 files changed, 89 insertions, 0 deletions

diff --git a/libavcodec/h265_profile_level.h b/libavcodec/h265_profile_level.h
new file mode 100644
index 0000000000..12c00f0077
--- /dev/null
+++ b/libavcodec/h265_profile_level.h
@@ -0,0 +1,89 @@
+/*
+ * 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_H265_PROFILE_LEVEL_H
+#define AVCODEC_H265_PROFILE_LEVEL_H
+
+#include <stdint.h>
+
+#include "cbs_h265.h"
+
+
+typedef struct H265LevelDescriptor {
+    const char *name;
+    uint8_t     level_idc;
+
+    // Table A.6.
+    uint32_t    max_luma_ps;
+    uint32_t    max_cpb_main;
+    uint32_t    max_cpb_high;
+    uint16_t    max_slice_segments_per_picture;
+    uint8_t     max_tile_rows;
+    uint8_t     max_tile_cols;
+
+    // Table A.7.
+    uint32_t    max_luma_sr;
+    uint32_t    max_br_main;
+    uint32_t    max_br_high;
+    uint8_t     min_cr_base_main;
+    uint8_t     min_cr_base_high;
+} H265LevelDescriptor;
+
+typedef struct H265ProfileDescriptor {
+    const char *name;
+    uint8_t profile_idc;
+    uint8_t high_throughput;
+
+    // Tables A.2, A.3 and A.5.
+    uint8_t max_14bit;
+    uint8_t max_12bit;
+    uint8_t max_10bit;
+    uint8_t max_8bit;
+    uint8_t max_422chroma;
+    uint8_t max_420chroma;
+    uint8_t max_monochrome;
+    uint8_t intra;
+    uint8_t one_picture_only;
+    uint8_t lower_bit_rate;
+
+    // Table A.8.
+    uint16_t cpb_vcl_factor;
+    uint16_t cpb_nal_factor;
+    float format_capability_factor;
+    float min_cr_scale_factor;
+} H265ProfileDescriptor;
+
+
+const H265LevelDescriptor *ff_h265_get_level(int level_idc);
+
+const H265ProfileDescriptor *ff_h265_get_profile(const H265RawProfileTierLevel *ptl);
+
+
+/**
+ * Guess the level of a stream from some parameters.
+ *
+ * Unknown parameters may be zero, in which case they are ignored.
+ */
+const H265LevelDescriptor *ff_h265_guess_level(const H265RawProfileTierLevel *ptl,
+                                               int64_t bitrate,
+                                               int width, int height,
+                                               int slice_segments,
+                                               int tile_rows, int tile_cols,
+                                               int max_dec_pic_buffering);
+
+#endif /* AVCODEC_H265_PROFILE_LEVEL_H */