1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavutil/common.h"
20 #include "libavutil/opt.h"
21
22 #include "bsf.h"
23 #include "bsf_internal.h"
24 #include "cbs.h"
25 #include "cbs_bsf.h"
26 #include "cbs_av1.h"
27
28 typedef struct AV1MetadataContext {
29 CBSBSFContext common;
30
31 int td;
32 AV1RawOBU td_obu;
33
34 int color_primaries;
35 int transfer_characteristics;
36 int matrix_coefficients;
37
38 int color_range;
39 int chroma_sample_position;
40
41 AVRational tick_rate;
42 int num_ticks_per_picture;
43
44 int delete_padding;
45 } AV1MetadataContext;
46
47
av1_metadata_update_sequence_header(AVBSFContext *bsf, AV1RawSequenceHeader *seq)48 static int av1_metadata_update_sequence_header(AVBSFContext *bsf,
49 AV1RawSequenceHeader *seq)
50 {
51 AV1MetadataContext *ctx = bsf->priv_data;
52 AV1RawColorConfig *clc = &seq->color_config;
53 AV1RawTimingInfo *tim = &seq->timing_info;
54
55 if (ctx->color_primaries >= 0 ||
56 ctx->transfer_characteristics >= 0 ||
57 ctx->matrix_coefficients >= 0) {
58 clc->color_description_present_flag = 1;
59
60 if (ctx->color_primaries >= 0)
61 clc->color_primaries = ctx->color_primaries;
62 if (ctx->transfer_characteristics >= 0)
63 clc->transfer_characteristics = ctx->transfer_characteristics;
64 if (ctx->matrix_coefficients >= 0)
65 clc->matrix_coefficients = ctx->matrix_coefficients;
66 }
67
68 if (ctx->color_range >= 0) {
69 if (clc->color_primaries == AVCOL_PRI_BT709 &&
70 clc->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
71 clc->matrix_coefficients == AVCOL_SPC_RGB) {
72 av_log(bsf, AV_LOG_WARNING, "Warning: color_range cannot be set "
73 "on RGB streams encoded in BT.709 sRGB.\n");
74 } else {
75 clc->color_range = ctx->color_range;
76 }
77 }
78
79 if (ctx->chroma_sample_position >= 0) {
80 if (clc->mono_chrome || !clc->subsampling_x || !clc->subsampling_y) {
81 av_log(bsf, AV_LOG_WARNING, "Warning: chroma_sample_position "
82 "can only be set for 4:2:0 streams.\n");
83 } else {
84 clc->chroma_sample_position = ctx->chroma_sample_position;
85 }
86 }
87
88 if (ctx->tick_rate.num && ctx->tick_rate.den) {
89 int num, den;
90
91 av_reduce(&num, &den, ctx->tick_rate.num, ctx->tick_rate.den,
92 UINT32_MAX > INT_MAX ? UINT32_MAX : INT_MAX);
93
94 tim->time_scale = num;
95 tim->num_units_in_display_tick = den;
96 seq->timing_info_present_flag = 1;
97
98 if (ctx->num_ticks_per_picture > 0) {
99 tim->equal_picture_interval = 1;
100 tim->num_ticks_per_picture_minus_1 =
101 ctx->num_ticks_per_picture - 1;
102 }
103 }
104
105 return 0;
106 }
107
av1_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt, CodedBitstreamFragment *frag)108 static int av1_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
109 CodedBitstreamFragment *frag)
110 {
111 AV1MetadataContext *ctx = bsf->priv_data;
112 int err, i;
113
114 for (i = 0; i < frag->nb_units; i++) {
115 if (frag->units[i].type == AV1_OBU_SEQUENCE_HEADER) {
116 AV1RawOBU *obu = frag->units[i].content;
117 err = av1_metadata_update_sequence_header(bsf, &obu->obu.sequence_header);
118 if (err < 0)
119 return err;
120 }
121 }
122
123 // If a Temporal Delimiter is present, it must be the first OBU.
124 if (frag->nb_units && frag->units[0].type == AV1_OBU_TEMPORAL_DELIMITER) {
125 if (ctx->td == BSF_ELEMENT_REMOVE)
126 ff_cbs_delete_unit(frag, 0);
127 } else if (pkt && ctx->td == BSF_ELEMENT_INSERT) {
128 err = ff_cbs_insert_unit_content(frag, 0, AV1_OBU_TEMPORAL_DELIMITER,
129 &ctx->td_obu, NULL);
130 if (err < 0) {
131 av_log(bsf, AV_LOG_ERROR, "Failed to insert Temporal Delimiter.\n");
132 return err;
133 }
134 }
135
136 if (ctx->delete_padding) {
137 for (i = frag->nb_units - 1; i >= 0; i--) {
138 if (frag->units[i].type == AV1_OBU_PADDING)
139 ff_cbs_delete_unit(frag, i);
140 }
141 }
142
143 return 0;
144 }
145
146 static const CBSBSFType av1_metadata_type = {
147 .codec_id = AV_CODEC_ID_AV1,
148 .fragment_name = "temporal unit",
149 .unit_name = "OBU",
150 .update_fragment = &av1_metadata_update_fragment,
151 };
152
av1_metadata_init(AVBSFContext *bsf)153 static int av1_metadata_init(AVBSFContext *bsf)
154 {
155 AV1MetadataContext *ctx = bsf->priv_data;
156
157 ctx->td_obu = (AV1RawOBU) {
158 .header.obu_type = AV1_OBU_TEMPORAL_DELIMITER,
159 };
160
161 return ff_cbs_bsf_generic_init(bsf, &av1_metadata_type);
162 }
163
164 #define OFFSET(x) offsetof(AV1MetadataContext, x)
165 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
166 static const AVOption av1_metadata_options[] = {
167 BSF_ELEMENT_OPTIONS_PIR("td", "Temporal Delimiter OBU",
168 td, FLAGS),
169
170 { "color_primaries", "Set color primaries (section 6.4.2)",
171 OFFSET(color_primaries), AV_OPT_TYPE_INT,
172 { .i64 = -1 }, -1, 255, FLAGS },
173 { "transfer_characteristics", "Set transfer characteristics (section 6.4.2)",
174 OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
175 { .i64 = -1 }, -1, 255, FLAGS },
176 { "matrix_coefficients", "Set matrix coefficients (section 6.4.2)",
177 OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
178 { .i64 = -1 }, -1, 255, FLAGS },
179
180 { "color_range", "Set color range flag (section 6.4.2)",
181 OFFSET(color_range), AV_OPT_TYPE_INT,
182 { .i64 = -1 }, -1, 1, FLAGS, "cr" },
183 { "tv", "TV (limited) range", 0, AV_OPT_TYPE_CONST,
184 { .i64 = 0 }, .flags = FLAGS, .unit = "cr" },
185 { "pc", "PC (full) range", 0, AV_OPT_TYPE_CONST,
186 { .i64 = 1 }, .flags = FLAGS, .unit = "cr" },
187
188 { "chroma_sample_position", "Set chroma sample position (section 6.4.2)",
189 OFFSET(chroma_sample_position), AV_OPT_TYPE_INT,
190 { .i64 = -1 }, -1, 3, FLAGS, "csp" },
191 { "unknown", "Unknown chroma sample position", 0, AV_OPT_TYPE_CONST,
192 { .i64 = AV1_CSP_UNKNOWN }, .flags = FLAGS, .unit = "csp" },
193 { "vertical", "Left chroma sample position", 0, AV_OPT_TYPE_CONST,
194 { .i64 = AV1_CSP_VERTICAL }, .flags = FLAGS, .unit = "csp" },
195 { "colocated", "Top-left chroma sample position", 0, AV_OPT_TYPE_CONST,
196 { .i64 = AV1_CSP_COLOCATED }, .flags = FLAGS, .unit = "csp" },
197
198 { "tick_rate", "Set display tick rate (time_scale / num_units_in_display_tick)",
199 OFFSET(tick_rate), AV_OPT_TYPE_RATIONAL,
200 { .dbl = 0.0 }, 0, UINT_MAX, FLAGS },
201 { "num_ticks_per_picture", "Set display ticks per picture for CFR streams",
202 OFFSET(num_ticks_per_picture), AV_OPT_TYPE_INT,
203 { .i64 = -1 }, -1, INT_MAX, FLAGS },
204
205 { "delete_padding", "Delete all Padding OBUs",
206 OFFSET(delete_padding), AV_OPT_TYPE_BOOL,
207 { .i64 = 0 }, 0, 1, FLAGS},
208
209 { NULL }
210 };
211
212 static const AVClass av1_metadata_class = {
213 .class_name = "av1_metadata_bsf",
214 .item_name = av_default_item_name,
215 .option = av1_metadata_options,
216 .version = LIBAVUTIL_VERSION_INT,
217 };
218
219 static const enum AVCodecID av1_metadata_codec_ids[] = {
220 AV_CODEC_ID_AV1, AV_CODEC_ID_NONE,
221 };
222
223 const FFBitStreamFilter ff_av1_metadata_bsf = {
224 .p.name = "av1_metadata",
225 .p.codec_ids = av1_metadata_codec_ids,
226 .p.priv_class = &av1_metadata_class,
227 .priv_data_size = sizeof(AV1MetadataContext),
228 .init = &av1_metadata_init,
229 .close = &ff_cbs_bsf_generic_close,
230 .filter = &ff_cbs_bsf_generic_filter,
231 };
232