FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/evc.c
Date: 2025-10-25 08:50:29
Exec Total Coverage
Lines: 149 166 89.8%
Functions: 6 6 100.0%
Branches: 52 73 71.2%
Line Branch Exec Source
1 /*
2 * EVC helper functions for muxers
3 * Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/mem.h"
23 #include "libavcodec/get_bits.h"
24 #include "libavcodec/golomb.h"
25 #include "libavcodec/evc.h"
26 #include "avio.h"
27 #include "evc.h"
28
29 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.1
30 enum {
31 SPS_INDEX,
32 PPS_INDEX,
33 APS_INDEX,
34 SEI_INDEX,
35 NB_ARRAYS
36 };
37
38 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
39 typedef struct EVCNALUnitArray {
40 uint8_t array_completeness; // when equal to 1 indicates that all NAL units of the given type are in the following array
41 uint8_t NAL_unit_type; // indicates the type of the NAL units in the following array
42 uint16_t numNalus; // indicates the number of NAL units of the indicated type
43 uint16_t *nalUnitLength; // indicates the length in bytes of the NAL unit
44 uint8_t **nalUnit; // contains an SPS, PPS, APS or a SEI NAL unit, as specified in ISO/IEC 23094-1
45 } EVCNALUnitArray;
46
47 /**
48 * @brief Specifies the decoder configuration information for ISO/IEC 23094-1 video content.
49 * @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.2
50 * Carriage of network abstraction layer (NAL) unit structured video in the ISO base media file format
51 */
52 typedef struct EVCDecoderConfigurationRecord {
53 uint8_t configurationVersion; // 8 bits
54 uint8_t profile_idc; // 8 bits
55 uint8_t level_idc; // 8 bits
56 uint32_t toolset_idc_h; // 32 bits
57 uint32_t toolset_idc_l; // 32 bits
58 uint8_t chroma_format_idc; // 2 bits
59 uint8_t bit_depth_luma_minus8; // 3 bits
60 uint8_t bit_depth_chroma_minus8; // 3 bits
61 uint16_t pic_width_in_luma_samples; // 16 bits
62 uint16_t pic_height_in_luma_samples; // 16 bits
63 uint8_t lengthSizeMinusOne; // 2 bits
64 uint8_t num_of_arrays; // 8 bits
65 EVCNALUnitArray arrays[NB_ARRAYS];
66 } EVCDecoderConfigurationRecord;
67
68 typedef struct NALU {
69 int offset;
70 uint32_t size;
71 } NALU;
72
73 typedef struct NALUList {
74 NALU *nalus;
75 unsigned nalus_array_size;
76 unsigned nb_nalus; ///< valid entries in nalus
77 } NALUList;
78
79 // @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
80 1 static int evcc_parse_sps(const uint8_t *bs, int bs_size, EVCDecoderConfigurationRecord *evcc)
81 {
82 GetBitContext gb;
83 unsigned sps_seq_parameter_set_id;
84 int ret;
85
86 1 bs += EVC_NALU_HEADER_SIZE;
87 1 bs_size -= EVC_NALU_HEADER_SIZE;
88
89 1 ret = init_get_bits8(&gb, bs, bs_size);
90
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 1 if (ret < 0)
91 ✗ return ret;
92
93 1 sps_seq_parameter_set_id = get_ue_golomb_long(&gb);
94
95
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 1 if (sps_seq_parameter_set_id >= EVC_MAX_SPS_COUNT)
96 ✗ return AVERROR_INVALIDDATA;
97
98 // the Baseline profile is indicated by profile_idc eqal to 0
99 // the Main profile is indicated by profile_idc eqal to 1
100 1 evcc->profile_idc = get_bits(&gb, 8);
101
102 1 evcc->level_idc = get_bits(&gb, 8);
103
104 1 evcc->toolset_idc_h = get_bits_long(&gb, 32);
105 1 evcc->toolset_idc_l = get_bits_long(&gb, 32);
106
107 // 0 - monochrome
108 // 1 - 4:2:0
109 // 2 - 4:2:2
110 // 3 - 4:4:4
111 1 evcc->chroma_format_idc = get_ue_golomb_long(&gb);
112
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 1 if (evcc->chroma_format_idc > 3)
113 ✗ return AVERROR_INVALIDDATA;
114
115 1 evcc->pic_width_in_luma_samples = get_ue_golomb_long(&gb);
116 1 evcc->pic_height_in_luma_samples = get_ue_golomb_long(&gb);
117
118 1 evcc->bit_depth_luma_minus8 = get_ue_golomb_long(&gb);
119 1 evcc->bit_depth_chroma_minus8 = get_ue_golomb_long(&gb);
120 // EVCDecoderConfigurationRecord can't store values > 7. Limit it to bit depth 14.
121
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 1 if (evcc->bit_depth_luma_minus8 > 6 || evcc->bit_depth_chroma_minus8 > 6)
122 ✗ return AVERROR_INVALIDDATA;
123
124 1 return 0;
125 }
126
127 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
128 3 static int evcc_array_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,
129 uint8_t nal_type, int ps_array_completeness,
130 EVCNALUnitArray *array)
131 {
132 int ret;
133 3 uint16_t numNalus = array->numNalus;
134
135 3 ret = av_reallocp_array(&array->nalUnit, numNalus + 1, sizeof(uint8_t *));
136
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 3 if (ret < 0)
137 ✗ return ret;
138
139 3 ret = av_reallocp_array(&array->nalUnitLength, numNalus + 1, sizeof(uint16_t));
140
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 3 if (ret < 0)
141 ✗ return ret;
142
143 3 array->nalUnit [numNalus] = (uint8_t *)nal_buf;
144 3 array->nalUnitLength[numNalus] = nal_size;
145 3 array->NAL_unit_type = nal_type;
146 3 array->numNalus++;
147
148 /*
149 * When the sample entry name is 'evc1', the default and mandatory value of
150 * array_completeness is 1 for arrays of all types of parameter sets, and 0
151 * for all other arrays.
152 */
153
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 3 if (nal_type == EVC_SPS_NUT || nal_type == EVC_PPS_NUT || nal_type == EVC_APS_NUT)
154 2 array->array_completeness = ps_array_completeness;
155
156 3 return 0;
157 }
158
159 1 static void evcc_init(EVCDecoderConfigurationRecord *evcc)
160 {
161 1 memset(evcc, 0, sizeof(EVCDecoderConfigurationRecord));
162 1 evcc->configurationVersion = 1;
163 1 evcc->lengthSizeMinusOne = 3; // 4 bytes
164 1 }
165
166 1 static void evcc_close(EVCDecoderConfigurationRecord *evcc)
167 {
168
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 5 for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
169 4 EVCNALUnitArray *const array = &evcc->arrays[i];
170 4 array->numNalus = 0;
171 4 av_freep(&array->nalUnit);
172 4 av_freep(&array->nalUnitLength);
173 }
174 1 }
175
176 1 static int evcc_write(AVIOContext *pb, EVCDecoderConfigurationRecord *evcc)
177 {
178 uint16_t sps_count;
179
180 1 av_log(NULL, AV_LOG_TRACE, "configurationVersion: %"PRIu8"\n",
181 1 evcc->configurationVersion);
182 1 av_log(NULL, AV_LOG_TRACE, "profile_idc: %"PRIu8"\n",
183 1 evcc->profile_idc);
184 1 av_log(NULL, AV_LOG_TRACE, "level_idc: %"PRIu8"\n",
185 1 evcc->level_idc);
186 1 av_log(NULL, AV_LOG_TRACE, "toolset_idc_h: %"PRIu32"\n",
187 evcc->toolset_idc_h);
188 1 av_log(NULL, AV_LOG_TRACE, "toolset_idc_l: %"PRIu32"\n",
189 evcc->toolset_idc_l);
190 1 av_log(NULL, AV_LOG_TRACE, "chroma_format_idc: %"PRIu8"\n",
191 1 evcc->chroma_format_idc);
192 1 av_log(NULL, AV_LOG_TRACE, "bit_depth_luma_minus8: %"PRIu8"\n",
193 1 evcc->bit_depth_luma_minus8);
194 1 av_log(NULL, AV_LOG_TRACE, "bit_depth_chroma_minus8: %"PRIu8"\n",
195 1 evcc->bit_depth_chroma_minus8);
196 1 av_log(NULL, AV_LOG_TRACE, "pic_width_in_luma_samples: %"PRIu16"\n",
197 1 evcc->pic_width_in_luma_samples);
198 1 av_log(NULL, AV_LOG_TRACE, "pic_height_in_luma_samples: %"PRIu16"\n",
199 1 evcc->pic_height_in_luma_samples);
200 1 av_log(NULL, AV_LOG_TRACE, "lengthSizeMinusOne: %"PRIu8"\n",
201 1 evcc->lengthSizeMinusOne);
202 1 av_log(NULL, AV_LOG_TRACE, "num_of_arrays: %"PRIu8"\n",
203 1 evcc->num_of_arrays);
204
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 5 for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
205 4 const EVCNALUnitArray *const array = &evcc->arrays[i];
206
207
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 4 if(array->numNalus == 0)
208 1 continue;
209
210 3 av_log(NULL, AV_LOG_TRACE, "array_completeness[%u]: %"PRIu8"\n",
211 3 i, array->array_completeness);
212 3 av_log(NULL, AV_LOG_TRACE, "NAL_unit_type[%u]: %"PRIu8"\n",
213 3 i, array->NAL_unit_type);
214 3 av_log(NULL, AV_LOG_TRACE, "numNalus[%u]: %"PRIu16"\n",
215 3 i, array->numNalus);
216
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 6 for ( unsigned j = 0; j < array->numNalus; j++)
217 3 av_log(NULL, AV_LOG_TRACE,
218 "nalUnitLength[%u][%u]: %"PRIu16"\n",
219 3 i, j, array->nalUnitLength[j]);
220 }
221
222 /*
223 * We need at least one SPS.
224 */
225 1 sps_count = evcc->arrays[SPS_INDEX].numNalus;
226
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 1 if (!sps_count || sps_count > EVC_MAX_SPS_COUNT)
227 ✗ return AVERROR_INVALIDDATA;
228
229 /* unsigned int(8) configurationVersion = 1; */
230 1 avio_w8(pb, evcc->configurationVersion);
231
232 /* unsigned int(8) profile_idc */
233 1 avio_w8(pb, evcc->profile_idc);
234
235 /* unsigned int(8) level_idc */
236 1 avio_w8(pb, evcc->level_idc);
237
238 /* unsigned int(32) toolset_idc_h */
239 1 avio_wb32(pb, evcc->toolset_idc_h);
240
241 /* unsigned int(32) toolset_idc_l */
242 1 avio_wb32(pb, evcc->toolset_idc_l);
243
244 /*
245 * unsigned int(2) chroma_format_idc;
246 * unsigned int(3) bit_depth_luma_minus8;
247 * unsigned int(3) bit_depth_chroma_minus8;
248 */
249 1 avio_w8(pb, evcc->chroma_format_idc << 6 |
250 1 evcc->bit_depth_luma_minus8 << 3 |
251 1 evcc->bit_depth_chroma_minus8);
252
253 /* unsigned int(16) pic_width_in_luma_samples; */
254 1 avio_wb16(pb, evcc->pic_width_in_luma_samples);
255
256 /* unsigned int(16) pic_height_in_luma_samples; */
257 1 avio_wb16(pb, evcc->pic_height_in_luma_samples);
258
259 /*
260 * unsigned int(6) reserved = '000000'b;
261 * unsigned int(2) lengthSizeMinusOne;
262 */
263 1 avio_w8(pb, evcc->lengthSizeMinusOne & 0x3);
264
265 /* unsigned int(8) numOfArrays; */
266 1 avio_w8(pb, evcc->num_of_arrays);
267
268
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 5 for (unsigned i = 0; i < FF_ARRAY_ELEMS(evcc->arrays); i++) {
269 4 const EVCNALUnitArray *const array = &evcc->arrays[i];
270
271
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 4 if (!array->numNalus)
272 1 continue;
273
274 /*
275 * bit(1) array_completeness;
276 * unsigned int(1) reserved = 0;
277 * unsigned int(6) NAL_unit_type;
278 */
279 3 avio_w8(pb, array->array_completeness << 7 |
280 3 array->NAL_unit_type & 0x3f);
281
282 /* unsigned int(16) numNalus; */
283 3 avio_wb16(pb, array->numNalus);
284
285
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 6 for (unsigned j = 0; j < array->numNalus; j++) {
286 /* unsigned int(16) nalUnitLength; */
287 3 avio_wb16(pb, array->nalUnitLength[j]);
288
289 /* bit(8*nalUnitLength) nalUnit; */
290 3 avio_write(pb, array->nalUnit[j],
291 3 array->nalUnitLength[j]);
292 }
293 }
294
295 1 return 0;
296 }
297
298 1 int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data,
299 int size, int ps_array_completeness)
300 {
301 EVCDecoderConfigurationRecord evcc;
302 int nalu_type;
303 size_t nalu_size;
304 1 int bytes_to_read = size;
305 unsigned array_index;
306
307 1 int ret = 0;
308
309
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 1 if (size < 8) {
310 /* We can't write a valid evcC from the provided data */
311 ✗ return AVERROR_INVALIDDATA;
312
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 1 } else if (*data == 1) {
313 /* Data is already evcC-formatted */
314 ✗ avio_write(pb, data, size);
315 ✗ return 0;
316 }
317
318 1 evcc_init(&evcc);
319
320
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 5 while (bytes_to_read > EVC_NALU_LENGTH_PREFIX_SIZE) {
321 4 nalu_size = evc_read_nal_unit_length(data, EVC_NALU_LENGTH_PREFIX_SIZE);
322
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 4 if (nalu_size == 0) break;
323
324 4 data += EVC_NALU_LENGTH_PREFIX_SIZE;
325 4 bytes_to_read -= EVC_NALU_LENGTH_PREFIX_SIZE;
326
327
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 4 if (bytes_to_read < nalu_size) break;
328
329 4 nalu_type = evc_get_nalu_type(data, bytes_to_read);
330
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 4 if (nalu_type < EVC_NOIDR_NUT || nalu_type > EVC_UNSPEC_NUT62) {
331 ✗ ret = AVERROR_INVALIDDATA;
332 ✗ goto end;
333 }
334
335 // @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
336 // NAL_unit_type indicates the type of the NAL units in the following array (which shall be all of that type);
337 // - it takes a value as defined in ISO/IEC 23094-1;
338 // - it is restricted to take one of the values indicating a SPS, PPS, APS, or SEI NAL unit.
339
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 4 switch (nalu_type) {
340 1 case EVC_SPS_NUT:
341 1 array_index = SPS_INDEX;
342 1 break;
343 1 case EVC_PPS_NUT:
344 1 array_index = PPS_INDEX;
345 1 break;
346 ✗ case EVC_APS_NUT:
347 ✗ array_index = APS_INDEX;
348 ✗ break;
349 1 case EVC_SEI_NUT:
350 1 array_index = SEI_INDEX;
351 1 break;
352 1 default:
353 1 array_index = -1;
354 1 break;
355 }
356
357
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 4 if( (array_index == SPS_INDEX) ||
358
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 2 (array_index == PPS_INDEX) ||
359
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 2 (array_index == APS_INDEX) ||
360 (array_index == SEI_INDEX) ) {
361
362 3 ret = evcc_array_add_nal_unit(data, nalu_size, nalu_type, ps_array_completeness, &(evcc.arrays[array_index]));
363
364
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 3 if (ret < 0)
365 ✗ goto end;
366
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 3 if (evcc.arrays[array_index].numNalus == 1)
367 3 evcc.num_of_arrays++;
368
369
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 3 if(nalu_type == EVC_SPS_NUT) {
370 1 ret = evcc_parse_sps(data, nalu_size, &evcc);
371
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 1 if (ret < 0)
372 ✗ goto end;
373 }
374 }
375
376 4 data += nalu_size;
377 4 bytes_to_read -= nalu_size;
378 }
379
380 1 ret = evcc_write(pb, &evcc);
381
382 1 end:
383 1 evcc_close(&evcc);
384 1 return ret;
385 }
386