FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dovi_rpu.h
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 4 6 66.7%
Functions: 1 1 100.0%
Branches: 1 2 50.0%
Line Branch Exec Source
1 /*
2 * Dolby Vision RPU decoder
3 *
4 * Copyright (C) 2021 Jan Ekström
5 * Copyright (C) 2021 Niklas Haas
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #ifndef AVCODEC_DOVI_RPU_H
25 #define AVCODEC_DOVI_RPU_H
26
27 #include "libavutil/dovi_meta.h"
28 #include "libavutil/frame.h"
29
30 #include "avcodec.h"
31 #include "codec_par.h"
32
33 #define DOVI_MAX_DM_ID 15
34
35 typedef struct DOVIExt {
36 AVDOVIDmData dm_static[7]; ///< static extension blocks
37 AVDOVIDmData dm_dynamic[25]; ///< dynamic extension blocks
38 int num_static;
39 int num_dynamic;
40 } DOVIExt;
41
42 typedef struct DOVIContext {
43 void *logctx;
44
45 /**
46 * Enable tri-state. For encoding only. FF_DOVI_AUTOMATIC enables Dolby
47 * Vision only if avctx->decoded_side_data contains an AVDOVIMetadata.
48 */
49 #define FF_DOVI_AUTOMATIC -1
50 int enable;
51
52 /**
53 * Currently active dolby vision configuration, or {0} for none.
54 * Set by the user when decoding. Generated by ff_dovi_configure()
55 * when encoding.
56 *
57 * Note: sizeof(cfg) is not part of the libavutil ABI, so users should
58 * never pass &cfg to any other library calls. This is included merely as
59 * a way to look up the values of fields known at compile time.
60 */
61 AVDOVIDecoderConfigurationRecord cfg;
62
63 /**
64 * Currently active RPU data header, updates on every ff_dovi_rpu_parse()
65 * or ff_dovi_rpu_generate().
66 */
67 AVDOVIRpuDataHeader header;
68
69 /**
70 * Currently active data mappings, or NULL. Points into memory owned by the
71 * corresponding rpu/vdr_ref, which becomes invalid on the next call to
72 * ff_dovi_rpu_parse() or ff_dovi_rpu_generate().
73 */
74 const AVDOVIDataMapping *mapping;
75 const AVDOVIColorMetadata *color;
76
77 /**
78 * Currently active extension blocks, updates on every ff_dovi_rpu_parse()
79 * or ff_dovi_rpu_generate().
80 */
81 DOVIExt *ext_blocks; ///< RefStruct, or NULL if no extension blocks
82
83 /**
84 * Private fields internal to dovi_rpu.c
85 */
86 AVDOVIColorMetadata *dm; ///< RefStruct
87 AVDOVIDataMapping *vdr[DOVI_MAX_DM_ID+1]; ///< RefStruct references
88 uint8_t *rpu_buf; ///< temporary buffer
89 unsigned rpu_buf_sz;
90
91 } DOVIContext;
92
93 void ff_dovi_ctx_replace(DOVIContext *s, const DOVIContext *s0);
94
95 /**
96 * Completely reset a DOVIContext, preserving only logctx.
97 */
98 void ff_dovi_ctx_unref(DOVIContext *s);
99
100 /**
101 * Partially reset the internal state. Resets per-frame state, but preserves
102 * the stream-wide configuration record.
103 */
104 void ff_dovi_ctx_flush(DOVIContext *s);
105
106 /**
107 * Parse the contents of a Dolby Vision RPU and update the parsed values in the
108 * DOVIContext struct. This function should receive the decoded unit payload,
109 * without any T.35 or NAL unit headers.
110 *
111 * Returns 0 or an error code.
112 *
113 * Note: `DOVIContext.cfg` should be initialized before calling into this
114 * function. If not done, the profile will be guessed according to HEVC
115 * semantics.
116 */
117 int ff_dovi_rpu_parse(DOVIContext *s, const uint8_t *rpu, size_t rpu_size,
118 int err_recognition);
119
120 /**
121 * Get the decoded AVDOVIMetadata. Ownership passes to the caller.
122 *
123 * Returns the size of *out_metadata, a negative error code, or 0 if no
124 * metadata is available to return.
125 */
126 int ff_dovi_get_metadata(DOVIContext *s, AVDOVIMetadata **out_metadata);
127
128 /**
129 * Attach the decoded AVDOVIMetadata as side data to an AVFrame.
130 * Returns 0 or a negative error code.
131 */
132 int ff_dovi_attach_side_data(DOVIContext *s, AVFrame *frame);
133
134 /**
135 * Configure the encoder for Dolby Vision encoding. Generates a configuration
136 * record in s->cfg, and attaches it to codecpar->coded_side_data. Sets the
137 * correct profile and compatibility ID based on the tagged AVCodecParameters
138 * colorspace metadata, and the correct level based on the resolution and
139 * tagged framerate.
140 *
141 * `metadata` should point to the first frame's RPU, if available. If absent,
142 * auto-detection will be performed, but this can sometimes lead to inaccurate
143 * results (in particular for HEVC streams with enhancement layers).
144 *
145 * Returns 0 or a negative error code.
146 */
147 int ff_dovi_configure_from_codedpar(DOVIContext *s, AVCodecParameters *codecpar,
148 const AVDOVIMetadata *metadata,
149 enum AVDOVICompression compression,
150 int strict_std_compliance);
151
152 /**
153 * Variant of `ff_dovi_configure_from_codedpar` which infers the codec
154 * parameters from an AVCodecContext.
155 */
156 int ff_dovi_configure(DOVIContext *s, AVCodecContext *avctx);
157
158 enum {
159 FF_DOVI_WRAP_NAL = 1 << 0, ///< wrap inside NAL RBSP
160 FF_DOVI_WRAP_T35 = 1 << 1, ///< wrap inside T.35+EMDF
161 FF_DOVI_COMPRESS_RPU = 1 << 2, ///< enable compression for this RPU
162 };
163
164 /**
165 * Synthesize a Dolby Vision RPU reflecting the current state. By default, the
166 * RPU is not encapsulated (see `flags` for more options). Note that this
167 * assumes all previous calls to `ff_dovi_rpu_generate` have been
168 * appropriately signalled, i.e. it will not re-send already transmitted
169 * redundant data.
170 *
171 * Mutates the internal state of DOVIContext to reflect the change.
172 * Returns 0 or a negative error code.
173 */
174 int ff_dovi_rpu_generate(DOVIContext *s, const AVDOVIMetadata *metadata,
175 int flags, uint8_t **out_rpu, int *out_size);
176
177
178 /***************************************************
179 * The following section is for internal use only. *
180 ***************************************************/
181
182 enum {
183 RPU_COEFF_FIXED = 0,
184 RPU_COEFF_FLOAT = 1,
185 };
186
187 /**
188 * Internal helper function to guess the correct DV profile for HEVC.
189 *
190 * Returns the profile number or 0 if unknown.
191 */
192 int ff_dovi_guess_profile_hevc(const AVDOVIRpuDataHeader *hdr);
193
194 /* Default values for AVDOVIColorMetadata */
195 extern const AVDOVIColorMetadata ff_dovi_color_default;
196
197 2 static inline int ff_dovi_rpu_extension_is_static(int level)
198 {
199
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 2 switch (level) {
200 ✗ case 6:
201 case 10:
202 case 32: /* reserved as static by spec */
203 case 254:
204 case 255:
205 ✗ return 1;
206 2 default:
207 2 return 0;
208 }
209 }
210
211 #endif /* AVCODEC_DOVI_RPU_H */
212