FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/vvc_mp4toannexb.c
Date: 2024-07-14 13:34:57
Exec Total Coverage
Lines: 0 159 0.0%
Functions: 0 3 0.0%
Branches: 0 98 0.0%

Line Branch Exec Source
1 /*
2 * H.266/VVC MP4 to Annex B byte stream format filter
3 * Copyright (c) 2022, Thomas Siedel
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 <string.h>
23
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/mem.h"
26
27 #include "bsf.h"
28 #include "bsf_internal.h"
29 #include "bytestream.h"
30 #include "defs.h"
31 #include "vvc.h"
32
33 #define MIN_VVCC_LENGTH 23
34
35 typedef struct VVCBSFContext {
36 uint8_t length_size;
37 int extradata_parsed;
38 } VVCBSFContext;
39
40 static int vvc_extradata_to_annexb(AVBSFContext *ctx)
41 {
42 GetByteContext gb;
43 int length_size, num_arrays, i, j;
44 int ret = 0;
45 int temp = 0;
46 int ptl_present;
47
48 uint8_t *new_extradata = NULL;
49 size_t new_extradata_size = 0;
50
51 int max_picture_width = 0;
52 int max_picture_height = 0;
53 int avg_frame_rate = 0;
54
55 bytestream2_init(&gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
56 temp = bytestream2_get_byte(&gb);
57 length_size = ((temp & 6) >> 1) + 1;
58 ptl_present = temp & 1;
59 if (ptl_present) {
60 int num_bytes_constraint_info;
61 int general_profile_idc;
62 int general_tier_flag;
63 int general_level_idc;
64 int ptl_frame_only_constraint_flag;
65 int ptl_multi_layer_enabled_flag;
66 int ptl_num_sub_profiles;
67 int temp3, temp4, temp5;
68 int temp2 = bytestream2_get_be16(&gb);
69 int ols_idx = (temp2 >> 7) & 0x1ff;
70 int num_sublayers = (temp2 >> 4) & 0x7;
71 int constant_frame_rate = (temp2 >> 2) & 0x3;
72 int chroma_format_idc = temp2 & 0x3;
73 int bit_depth_minus8 = (bytestream2_get_byte(&gb) >> 5) & 0x7;
74 av_log(ctx, AV_LOG_DEBUG,
75 "bit_depth_minus8 %d chroma_format_idc %d\n", bit_depth_minus8,
76 chroma_format_idc);
77 av_log(ctx, AV_LOG_DEBUG, "constant_frame_rate %d, ols_idx %d\n",
78 constant_frame_rate, ols_idx);
79 // VvcPTLRecord(num_sublayers) native_ptl
80 temp3 = bytestream2_get_byte(&gb);
81 num_bytes_constraint_info = (temp3) & 0x3f;
82 temp4 = bytestream2_get_byte(&gb);
83 general_profile_idc = (temp4 >> 1) & 0x7f;
84 general_tier_flag = (temp4) & 1;
85 general_level_idc = bytestream2_get_byte(&gb);
86 av_log(ctx, AV_LOG_DEBUG,
87 "general_profile_idc %d, general_tier_flag %d, general_level_idc %d, num_sublayers %d num_bytes_constraint_info %d\n",
88 general_profile_idc, general_tier_flag, general_level_idc,
89 num_sublayers, num_bytes_constraint_info);
90
91 temp5 = bytestream2_get_byte(&gb);
92 ptl_frame_only_constraint_flag = (temp5 >> 7) & 0x1;
93 ptl_multi_layer_enabled_flag = (temp5 >> 6) & 0x1;
94 for (i = 0; i < num_bytes_constraint_info - 1; i++) {
95 // unsigned int(8*num_bytes_constraint_info - 2) general_constraint_info;
96 bytestream2_get_byte(&gb);
97 }
98
99 av_log(ctx, AV_LOG_DEBUG,
100 "ptl_multi_layer_enabled_flag %d, ptl_frame_only_constraint_flag %d\n",
101 ptl_multi_layer_enabled_flag, ptl_frame_only_constraint_flag);
102
103 if (num_sublayers > 1) {
104 int temp6 = bytestream2_get_byte(&gb);
105 uint8_t ptl_sublayer_level_present_flag[8] = { 0 };
106 //uint8_t sublayer_level_idc[8] = {0};
107 for (i = num_sublayers - 2; i >= 0; i--) {
108 ptl_sublayer_level_present_flag[i] =
109 (temp6 >> (7 - (num_sublayers - 2 - i))) & 0x01;
110 }
111 // for (j=num_sublayers; j<=8 && num_sublayers > 1; j++)
112 // bit(1) ptl_reserved_zero_bit = 0;
113 for (i = num_sublayers - 2; i >= 0; i--) {
114 if (ptl_sublayer_level_present_flag[i]) {
115 //sublayer_level_idc[i] = bytestream2_get_byte(&gb);
116 }
117 }
118 }
119
120 ptl_num_sub_profiles = bytestream2_get_byte(&gb);
121 for (j = 0; j < ptl_num_sub_profiles; j++) {
122 // unsigned int(32) general_sub_profile_idc[j];
123 bytestream2_get_be16(&gb);
124 bytestream2_get_be16(&gb);
125 }
126
127 max_picture_width = bytestream2_get_be16(&gb); // unsigned_int(16) max_picture_width;
128 max_picture_height = bytestream2_get_be16(&gb); // unsigned_int(16) max_picture_height;
129 avg_frame_rate = bytestream2_get_be16(&gb); // unsigned int(16) avg_frame_rate; }
130 av_log(ctx, AV_LOG_DEBUG,
131 "max_picture_width %d, max_picture_height %d, avg_frame_rate %d\n",
132 max_picture_width, max_picture_height, avg_frame_rate);
133 }
134
135 num_arrays = bytestream2_get_byte(&gb);
136
137 for (i = 0; i < num_arrays; i++) {
138 int cnt;
139 int type = bytestream2_get_byte(&gb) & 0x1f;
140
141 if (type == VVC_OPI_NUT || type == VVC_DCI_NUT)
142 cnt = 1;
143 else
144 cnt = bytestream2_get_be16(&gb);
145
146 av_log(ctx, AV_LOG_DEBUG, "nalu_type %d cnt %d\n", type, cnt);
147
148 if (!(type == VVC_OPI_NUT || type == VVC_DCI_NUT ||
149 type == VVC_VPS_NUT || type == VVC_SPS_NUT || type == VVC_PPS_NUT
150 || type == VVC_PREFIX_SEI_NUT || type == VVC_SUFFIX_SEI_NUT)) {
151 av_log(ctx, AV_LOG_ERROR,
152 "Invalid NAL unit type in extradata: %d\n", type);
153 ret = AVERROR_INVALIDDATA;
154 goto fail;
155 }
156
157 for (j = 0; j < cnt; j++) {
158 const int nalu_len = bytestream2_get_be16(&gb);
159
160 if (!nalu_len ||
161 nalu_len > bytestream2_get_bytes_left(&gb) ||
162 4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
163 ret = AVERROR_INVALIDDATA;
164 goto fail;
165 }
166 ret = av_reallocp(&new_extradata, new_extradata_size + nalu_len + 4
167 + AV_INPUT_BUFFER_PADDING_SIZE);
168 if (ret < 0)
169 goto fail;
170
171 AV_WB32(new_extradata + new_extradata_size, 1); // add the startcode
172 bytestream2_get_buffer(&gb, new_extradata + new_extradata_size + 4,
173 nalu_len);
174 new_extradata_size += 4 + nalu_len;
175 memset(new_extradata + new_extradata_size, 0,
176 AV_INPUT_BUFFER_PADDING_SIZE);
177 }
178 }
179
180 av_freep(&ctx->par_out->extradata);
181 ctx->par_out->extradata = new_extradata;
182 ctx->par_out->extradata_size = new_extradata_size;
183
184 if (!new_extradata_size)
185 av_log(ctx, AV_LOG_WARNING, "No parameter sets in the extradata\n");
186
187 return length_size;
188 fail:
189 av_freep(&new_extradata);
190 return ret;
191 }
192
193 static int vvc_mp4toannexb_init(AVBSFContext *ctx)
194 {
195 VVCBSFContext *s = ctx->priv_data;
196 int ret;
197
198 if (ctx->par_in->extradata_size < MIN_VVCC_LENGTH ||
199 AV_RB24(ctx->par_in->extradata) == 1 ||
200 AV_RB32(ctx->par_in->extradata) == 1) {
201 av_log(ctx, AV_LOG_VERBOSE,
202 "The input looks like it is Annex B already\n");
203 } else {
204 ret = vvc_extradata_to_annexb(ctx);
205 if (ret < 0)
206 return ret;
207 s->length_size = ret;
208 s->extradata_parsed = 1;
209 }
210
211 return 0;
212 }
213
214 static int vvc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
215 {
216 VVCBSFContext *s = ctx->priv_data;
217 AVPacket *in;
218 GetByteContext gb;
219
220 int is_irap = 0;
221 int added_extra = 0;
222 int i, ret = 0;
223
224 ret = ff_bsf_get_packet(ctx, &in);
225 if (ret < 0)
226 return ret;
227
228 if (!s->extradata_parsed) {
229 av_packet_move_ref(out, in);
230 av_packet_free(&in);
231 return 0;
232 }
233
234 bytestream2_init(&gb, in->data, in->size);
235
236 /* check if this packet contains an IRAP. The extradata will need to be added before any potential PH_NUT */
237 while (bytestream2_get_bytes_left(&gb)) {
238 uint32_t nalu_size = 0;
239 int nalu_type;
240
241 if (bytestream2_get_bytes_left(&gb) < s->length_size) {
242 ret = AVERROR_INVALIDDATA;
243 goto fail;
244 }
245
246 for (i = 0; i < s->length_size; i++)
247 nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
248
249 if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
250 ret = AVERROR_INVALIDDATA;
251 goto fail;
252 }
253
254 nalu_type = (bytestream2_peek_be16(&gb) >> 3) & 0x1f;
255 is_irap = nalu_type >= VVC_IDR_W_RADL && nalu_type <= VVC_RSV_IRAP_11;
256 if (is_irap) {
257 break;
258 }
259 bytestream2_seek(&gb, nalu_size, SEEK_CUR);
260 }
261
262 bytestream2_seek(&gb, 0, SEEK_SET);
263 while (bytestream2_get_bytes_left(&gb)) {
264 uint32_t nalu_size = 0;
265 int nalu_type;
266 int add_extradata, extra_size, prev_size;
267
268 if (bytestream2_get_bytes_left(&gb) < s->length_size) {
269 ret = AVERROR_INVALIDDATA;
270 goto fail;
271 }
272
273 for (i = 0; i < s->length_size; i++)
274 nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
275
276 if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
277 ret = AVERROR_INVALIDDATA;
278 goto fail;
279 }
280
281 nalu_type = (bytestream2_peek_be16(&gb) >> 3) & 0x1f;
282
283 /* prepend extradata to IRAP frames */
284 add_extradata = is_irap && nalu_type != VVC_AUD_NUT && !added_extra;
285 extra_size = add_extradata * ctx->par_out->extradata_size;
286 added_extra |= add_extradata;
287
288 if (FFMIN(INT_MAX, SIZE_MAX) < 4ULL + nalu_size + extra_size) {
289 ret = AVERROR_INVALIDDATA;
290 goto fail;
291 }
292
293 prev_size = out->size;
294
295 ret = av_grow_packet(out, 4 + nalu_size + extra_size);
296 if (ret < 0)
297 goto fail;
298
299 if (extra_size)
300 memcpy(out->data + prev_size, ctx->par_out->extradata, extra_size);
301 AV_WB32(out->data + prev_size + extra_size, 1);
302 bytestream2_get_buffer(&gb, out->data + prev_size + 4 + extra_size,
303 nalu_size);
304 }
305
306 ret = av_packet_copy_props(out, in);
307 if (ret < 0)
308 goto fail;
309
310 fail:
311 if (ret < 0)
312 av_packet_unref(out);
313 av_packet_free(&in);
314
315 return ret;
316 }
317
318 static const enum AVCodecID codec_ids[] = {
319 AV_CODEC_ID_VVC, AV_CODEC_ID_NONE,
320 };
321
322 const FFBitStreamFilter ff_vvc_mp4toannexb_bsf = {
323 .p.name = "vvc_mp4toannexb",
324 .p.codec_ids = codec_ids,
325 .priv_data_size = sizeof(VVCBSFContext),
326 .init = vvc_mp4toannexb_init,
327 .filter = vvc_mp4toannexb_filter,
328 };
329