FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/avc.c
Date: 2024-04-24 18:52:15
Exec Total Coverage
Lines: 199 291 68.4%
Functions: 11 14 78.6%
Branches: 117 222 52.7%
Line Branch Exec Source
1 /*
2 * AVC helper functions for muxers
3 * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.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/intreadwrite.h"
23 #include "libavutil/mem.h"
24 #include "libavcodec/h264.h"
25 #include "libavcodec/get_bits.h"
26 #include "avio.h"
27 #include "avc.h"
28 #include "avio_internal.h"
29
30 1728 static const uint8_t *avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
31 {
32 1728 const uint8_t *a = p + 4 - ((intptr_t)p & 3);
33
34
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 6074 for (end -= 3; p < a && p < end; p++) {
35
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 4965 if (p[0] == 0 && p[1] == 0 && p[2] == 1)
36 619 return p;
37 }
38
39
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 459415 for (end -= 3; p < end; p += 4) {
40 458836 uint32_t x = *(const uint32_t*)p;
41 // if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
42 // if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
43
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 458836 if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
44
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 5123 if (p[1] == 0) {
45
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 1515 if (p[0] == 0 && p[2] == 1)
46 129 return p;
47
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 1386 if (p[2] == 0 && p[3] == 1)
48 197 return p+1;
49 }
50
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 4797 if (p[3] == 0) {
51
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 1529 if (p[2] == 0 && p[4] == 1)
52 98 return p+2;
53
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 1431 if (p[4] == 0 && p[5] == 1)
54 106 return p+3;
55 }
56 }
57 }
58
59
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 1450 for (end += 3; p < end; p++) {
60
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 871 if (p[0] == 0 && p[1] == 0 && p[2] == 1)
61 ✗ return p;
62 }
63
64 579 return end + 3;
65 }
66
67 1728 const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
68 1728 const uint8_t *out = avc_find_startcode_internal(p, end);
69
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 1728 if(p<out && out<end && !out[-1]) out--;
70 1728 return out;
71 }
72
73 579 static int avc_parse_nal_units(AVIOContext *pb, NALUList *list,
74 const uint8_t *buf_in, int size)
75 {
76 579 const uint8_t *p = buf_in;
77 579 const uint8_t *end = p + size;
78 const uint8_t *nal_start, *nal_end;
79
80 579 size = 0;
81 579 nal_start = ff_avc_find_startcode(p, end);
82 1149 for (;;) {
83 1728 const size_t nalu_limit = SIZE_MAX / sizeof(*list->nalus);
84
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 4759 while (nal_start < end && !*(nal_start++));
85
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 1728 if (nal_start == end)
86 579 break;
87
88 1149 nal_end = ff_avc_find_startcode(nal_start, end);
89
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 1149 if (pb) {
90 869 avio_wb32(pb, nal_end - nal_start);
91 869 avio_write(pb, nal_start, nal_end - nal_start);
92
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 280 } else if (list->nb_nalus >= nalu_limit) {
93 ✗ return AVERROR(ERANGE);
94 } else {
95 280 NALU *tmp = av_fast_realloc(list->nalus, &list->nalus_array_size,
96 280 (list->nb_nalus + 1) * sizeof(*list->nalus));
97
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 280 if (!tmp)
98 ✗ return AVERROR(ENOMEM);
99 280 list->nalus = tmp;
100 280 tmp[list->nb_nalus++] = (NALU){ .offset = nal_start - p,
101 280 .size = nal_end - nal_start };
102 }
103 1149 size += 4 + nal_end - nal_start;
104 1149 nal_start = nal_end;
105 }
106 579 return size;
107 }
108
109 500 int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
110 {
111 500 return avc_parse_nal_units(pb, NULL, buf_in, size);
112 }
113
114 79 int ff_nal_units_create_list(NALUList *list, const uint8_t *buf, int size)
115 {
116 79 list->nb_nalus = 0;
117 79 return avc_parse_nal_units(NULL, list, buf, size);
118 }
119
120 79 void ff_nal_units_write_list(const NALUList *list, AVIOContext *pb,
121 const uint8_t *buf)
122 {
123
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 359 for (unsigned i = 0; i < list->nb_nalus; i++) {
124 280 avio_wb32(pb, list->nalus[i].size);
125 280 avio_write(pb, buf + list->nalus[i].offset, list->nalus[i].size);
126 }
127 79 }
128
129 4 int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
130 {
131 AVIOContext *pb;
132 4 int ret = avio_open_dyn_buf(&pb);
133
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 4 if(ret < 0)
134 ✗ return ret;
135
136 4 ff_avc_parse_nal_units(pb, buf_in, *size);
137
138 4 *size = avio_close_dyn_buf(pb, buf);
139 4 return 0;
140 }
141
142 57 int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
143 {
144 57 AVIOContext *sps_pb = NULL, *pps_pb = NULL, *sps_ext_pb = NULL;
145 uint8_t *buf, *end, *start;
146 uint8_t *sps, *pps, *sps_ext;
147 57 uint32_t sps_size = 0, pps_size = 0, sps_ext_size = 0;
148 57 int ret, nb_sps = 0, nb_pps = 0, nb_sps_ext = 0;
149
150
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 57 if (len <= 6)
151 ✗ return AVERROR_INVALIDDATA;
152
153 /* check for H.264 start code */
154
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 57 if (AV_RB32(data) != 0x00000001 &&
155
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 56 AV_RB24(data) != 0x000001) {
156 54 avio_write(pb, data, len);
157 54 return 0;
158 }
159
160 3 ret = ff_avc_parse_nal_units_buf(data, &buf, &len);
161
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 3 if (ret < 0)
162 ✗ return ret;
163 3 start = buf;
164 3 end = buf + len;
165
166 3 ret = avio_open_dyn_buf(&sps_pb);
167
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 3 if (ret < 0)
168 ✗ goto fail;
169 3 ret = avio_open_dyn_buf(&pps_pb);
170
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 3 if (ret < 0)
171 ✗ goto fail;
172 3 ret = avio_open_dyn_buf(&sps_ext_pb);
173
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 3 if (ret < 0)
174 ✗ goto fail;
175
176 /* look for sps and pps */
177
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 9 while (end - buf > 4) {
178 uint32_t size;
179 uint8_t nal_type;
180
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 6 size = FFMIN(AV_RB32(buf), end - buf - 4);
181 6 buf += 4;
182 6 nal_type = buf[0] & 0x1f;
183
184
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 6 if (nal_type == 7) { /* SPS */
185 3 nb_sps++;
186
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 3 if (size > UINT16_MAX || nb_sps >= H264_MAX_SPS_COUNT) {
187 ✗ ret = AVERROR_INVALIDDATA;
188 ✗ goto fail;
189 }
190 3 avio_wb16(sps_pb, size);
191 3 avio_write(sps_pb, buf, size);
192
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 3 } else if (nal_type == 8) { /* PPS */
193 3 nb_pps++;
194
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 3 if (size > UINT16_MAX || nb_pps >= H264_MAX_PPS_COUNT) {
195 ✗ ret = AVERROR_INVALIDDATA;
196 ✗ goto fail;
197 }
198 3 avio_wb16(pps_pb, size);
199 3 avio_write(pps_pb, buf, size);
200 ✗ } else if (nal_type == 13) { /* SPS_EXT */
201 ✗ nb_sps_ext++;
202 ✗ if (size > UINT16_MAX || nb_sps_ext >= 256) {
203 ✗ ret = AVERROR_INVALIDDATA;
204 ✗ goto fail;
205 }
206 ✗ avio_wb16(sps_ext_pb, size);
207 ✗ avio_write(sps_ext_pb, buf, size);
208 }
209
210 6 buf += size;
211 }
212 3 sps_size = avio_get_dyn_buf(sps_pb, &sps);
213 3 pps_size = avio_get_dyn_buf(pps_pb, &pps);
214 3 sps_ext_size = avio_get_dyn_buf(sps_ext_pb, &sps_ext);
215
216
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 3 if (sps_size < 6 || !pps_size) {
217 ✗ ret = AVERROR_INVALIDDATA;
218 ✗ goto fail;
219 }
220
221 3 avio_w8(pb, 1); /* version */
222 3 avio_w8(pb, sps[3]); /* profile */
223 3 avio_w8(pb, sps[4]); /* profile compat */
224 3 avio_w8(pb, sps[5]); /* level */
225 3 avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
226 3 avio_w8(pb, 0xe0 | nb_sps); /* 3 bits reserved (111) + 5 bits number of sps */
227
228 3 avio_write(pb, sps, sps_size);
229 3 avio_w8(pb, nb_pps); /* number of pps */
230 3 avio_write(pb, pps, pps_size);
231
232
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 3 if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) {
233 H264SPS seq;
234 3 ret = ff_avc_decode_sps(&seq, sps + 3, sps_size - 3);
235
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 3 if (ret < 0)
236 ✗ goto fail;
237
238 3 avio_w8(pb, 0xfc | seq.chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */
239 3 avio_w8(pb, 0xf8 | (seq.bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */
240 3 avio_w8(pb, 0xf8 | (seq.bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */
241 3 avio_w8(pb, nb_sps_ext); /* number of sps ext */
242
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 3 if (nb_sps_ext)
243 ✗ avio_write(pb, sps_ext, sps_ext_size);
244 }
245
246 ✗ fail:
247 3 ffio_free_dyn_buf(&sps_pb);
248 3 ffio_free_dyn_buf(&pps_pb);
249 3 ffio_free_dyn_buf(&sps_ext_pb);
250 3 av_free(start);
251
252 3 return ret;
253 }
254
255 ✗ int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
256 {
257 uint16_t sps_size, pps_size;
258 uint8_t *out;
259 int out_size;
260
261 ✗ *buf = NULL;
262 ✗ if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
263 ✗ return 0;
264 ✗ if (*size < 11 || in[0] != 1)
265 ✗ return AVERROR_INVALIDDATA;
266
267 ✗ sps_size = AV_RB16(&in[6]);
268 ✗ if (11 + sps_size > *size)
269 ✗ return AVERROR_INVALIDDATA;
270 ✗ pps_size = AV_RB16(&in[9 + sps_size]);
271 ✗ if (11 + sps_size + pps_size > *size)
272 ✗ return AVERROR_INVALIDDATA;
273 ✗ out_size = 8 + sps_size + pps_size;
274 ✗ out = av_mallocz(out_size + AV_INPUT_BUFFER_PADDING_SIZE);
275 ✗ if (!out)
276 ✗ return AVERROR(ENOMEM);
277 ✗ AV_WB32(&out[0], 0x00000001);
278 ✗ memcpy(out + 4, &in[8], sps_size);
279 ✗ AV_WB32(&out[4 + sps_size], 0x00000001);
280 ✗ memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
281 ✗ *buf = out;
282 ✗ *size = out_size;
283 ✗ return 0;
284 }
285
286 ✗ const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start,
287 const uint8_t *end,
288 int nal_length_size)
289 {
290 ✗ unsigned int res = 0;
291
292 ✗ if (end - start < nal_length_size)
293 ✗ return NULL;
294 ✗ while (nal_length_size--)
295 ✗ res = (res << 8) | *start++;
296
297 ✗ if (res > end - start)
298 ✗ return NULL;
299
300 ✗ return start + res;
301 }
302
303 6 uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len,
304 uint32_t *dst_len, int header_len)
305 {
306 uint8_t *dst;
307 uint32_t i, len;
308
309 6 dst = av_malloc(src_len + AV_INPUT_BUFFER_PADDING_SIZE);
310
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 6 if (!dst)
311 ✗ return NULL;
312
313 /* NAL unit header */
314 6 i = len = 0;
315
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 12 while (i < header_len && i < src_len)
316 6 dst[len++] = src[i++];
317
318
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 122 while (i + 2 < src_len)
319
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 116 if (!src[i] && !src[i + 1] && src[i + 2] == 3) {
320 12 dst[len++] = src[i++];
321 12 dst[len++] = src[i++];
322 12 i++; // remove emulation_prevention_three_byte
323 } else
324 104 dst[len++] = src[i++];
325
326
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 18 while (i < src_len)
327 12 dst[len++] = src[i++];
328
329 6 memset(dst + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
330
331 6 *dst_len = len;
332 6 return dst;
333 }
334
335 static const AVRational avc_sample_aspect_ratio[17] = {
336 { 0, 1 },
337 { 1, 1 },
338 { 12, 11 },
339 { 10, 11 },
340 { 16, 11 },
341 { 40, 33 },
342 { 24, 11 },
343 { 20, 11 },
344 { 32, 11 },
345 { 80, 33 },
346 { 18, 11 },
347 { 15, 11 },
348 { 64, 33 },
349 { 160, 99 },
350 { 4, 3 },
351 { 3, 2 },
352 { 2, 1 },
353 };
354
355 38 static inline int get_ue_golomb(GetBitContext *gb) {
356 int i;
357
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 87 for (i = 0; i < 32 && !get_bits1(gb); i++)
358 ;
359 38 return get_bitsz(gb, i) + (1 << i) - 1;
360 }
361
362 ✗ static inline int get_se_golomb(GetBitContext *gb) {
363 ✗ int v = get_ue_golomb(gb) + 1;
364 ✗ int sign = -(v & 1);
365 ✗ return ((v >> 1) ^ sign) - sign;
366 }
367
368 3 int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size)
369 {
370 int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
371 int num_ref_frames_in_pic_order_cnt_cycle;
372 3 int delta_scale, lastScale = 8, nextScale = 8;
373 int sizeOfScalingList;
374 GetBitContext gb;
375 uint8_t *rbsp_buf;
376
377 3 rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0);
378
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 3 if (!rbsp_buf)
379 ✗ return AVERROR(ENOMEM);
380
381 3 ret = init_get_bits8(&gb, rbsp_buf, rbsp_size);
382
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 3 if (ret < 0)
383 ✗ goto end;
384
385 3 memset(sps, 0, sizeof(*sps));
386
387 3 sps->profile_idc = get_bits(&gb, 8);
388 3 sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag
389 3 sps->constraint_set_flags |= get_bits1(&gb) << 1; // constraint_set1_flag
390 3 sps->constraint_set_flags |= get_bits1(&gb) << 2; // constraint_set2_flag
391 3 sps->constraint_set_flags |= get_bits1(&gb) << 3; // constraint_set3_flag
392 3 sps->constraint_set_flags |= get_bits1(&gb) << 4; // constraint_set4_flag
393 3 sps->constraint_set_flags |= get_bits1(&gb) << 5; // constraint_set5_flag
394 3 skip_bits(&gb, 2); // reserved_zero_2bits
395 3 sps->level_idc = get_bits(&gb, 8);
396 3 sps->id = get_ue_golomb(&gb);
397
398
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 3 if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
399 ✗ sps->profile_idc == 122 || sps->profile_idc == 244 || sps->profile_idc == 44 ||
400 ✗ sps->profile_idc == 83 || sps->profile_idc == 86 || sps->profile_idc == 118 ||
401 ✗ sps->profile_idc == 128 || sps->profile_idc == 138 || sps->profile_idc == 139 ||
402 ✗ sps->profile_idc == 134) {
403 3 sps->chroma_format_idc = get_ue_golomb(&gb); // chroma_format_idc
404
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 3 if (sps->chroma_format_idc == 3) {
405 ✗ skip_bits1(&gb); // separate_colour_plane_flag
406 }
407 3 sps->bit_depth_luma = get_ue_golomb(&gb) + 8;
408 3 sps->bit_depth_chroma = get_ue_golomb(&gb) + 8;
409 3 skip_bits1(&gb); // qpprime_y_zero_transform_bypass_flag
410
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 3 if (get_bits1(&gb)) { // seq_scaling_matrix_present_flag
411 ✗ for (i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++) {
412 ✗ if (!get_bits1(&gb)) // seq_scaling_list_present_flag
413 ✗ continue;
414 ✗ lastScale = 8;
415 ✗ nextScale = 8;
416 ✗ sizeOfScalingList = i < 6 ? 16 : 64;
417 ✗ for (j = 0; j < sizeOfScalingList; j++) {
418 ✗ if (nextScale != 0) {
419 ✗ delta_scale = get_se_golomb(&gb);
420 ✗ nextScale = (lastScale + delta_scale) & 0xff;
421 }
422 ✗ lastScale = nextScale == 0 ? lastScale : nextScale;
423 }
424 }
425 }
426 } else {
427 ✗ sps->chroma_format_idc = 1;
428 ✗ sps->bit_depth_luma = 8;
429 ✗ sps->bit_depth_chroma = 8;
430 }
431
432 3 get_ue_golomb(&gb); // log2_max_frame_num_minus4
433 3 pic_order_cnt_type = get_ue_golomb(&gb);
434
435
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 3 if (pic_order_cnt_type == 0) {
436 3 get_ue_golomb(&gb); // log2_max_pic_order_cnt_lsb_minus4
437 ✗ } else if (pic_order_cnt_type == 1) {
438 ✗ skip_bits1(&gb); // delta_pic_order_always_zero
439 ✗ get_se_golomb(&gb); // offset_for_non_ref_pic
440 ✗ get_se_golomb(&gb); // offset_for_top_to_bottom_field
441 ✗ num_ref_frames_in_pic_order_cnt_cycle = get_ue_golomb(&gb);
442 ✗ for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++)
443 ✗ get_se_golomb(&gb); // offset_for_ref_frame
444 }
445
446 3 get_ue_golomb(&gb); // max_num_ref_frames
447 3 skip_bits1(&gb); // gaps_in_frame_num_value_allowed_flag
448 3 get_ue_golomb(&gb); // pic_width_in_mbs_minus1
449 3 get_ue_golomb(&gb); // pic_height_in_map_units_minus1
450
451 3 sps->frame_mbs_only_flag = get_bits1(&gb);
452
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 3 if (!sps->frame_mbs_only_flag)
453 2 skip_bits1(&gb); // mb_adaptive_frame_field_flag
454
455 3 skip_bits1(&gb); // direct_8x8_inference_flag
456
457
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 3 if (get_bits1(&gb)) { // frame_cropping_flag
458 2 get_ue_golomb(&gb); // frame_crop_left_offset
459 2 get_ue_golomb(&gb); // frame_crop_right_offset
460 2 get_ue_golomb(&gb); // frame_crop_top_offset
461 2 get_ue_golomb(&gb); // frame_crop_bottom_offset
462 }
463
464
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 3 if (get_bits1(&gb)) { // vui_parameters_present_flag
465
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 3 if (get_bits1(&gb)) { // aspect_ratio_info_present_flag
466 2 aspect_ratio_idc = get_bits(&gb, 8);
467
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 2 if (aspect_ratio_idc == 0xff) {
468 ✗ sps->sar.num = get_bits(&gb, 16);
469 ✗ sps->sar.den = get_bits(&gb, 16);
470
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 2 } else if (aspect_ratio_idc < FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) {
471 2 sps->sar = avc_sample_aspect_ratio[aspect_ratio_idc];
472 }
473 }
474 }
475
476
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 3 if (!sps->sar.den) {
477 1 sps->sar.num = 1;
478 1 sps->sar.den = 1;
479 }
480
481 3 ret = 0;
482 3 end:
483 3 av_free(rbsp_buf);
484 3 return ret;
485 }
486