FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h2645_parse.c
Date: 2022-01-28 07:56:06
Exec Total Coverage
Lines: 184 215 85.6%
Branches: 127 166 76.5%

Line Branch Exec Source
1 /*
2 * H.264/HEVC common parsing code
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <string.h>
22
23 #include "config.h"
24
25 #include "libavutil/intmath.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/mem.h"
28
29 #include "bytestream.h"
30 #include "hevc.h"
31 #include "h264.h"
32 #include "h2645_parse.h"
33
34 194691 int ff_h2645_extract_rbsp(const uint8_t *src, int length,
35 H2645RBSP *rbsp, H2645NAL *nal, int small_padding)
36 {
37 int i, si, di;
38 uint8_t *dst;
39
40 194691 nal->skipped_bytes = 0;
41 #define STARTCODE_TEST \
42 if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \
43 if (src[i + 2] != 3 && src[i + 2] != 0) { \
44 /* startcode, so we must be past the end */ \
45 length = i; \
46 } \
47 break; \
48 }
49 #if HAVE_FAST_UNALIGNED
50 #define FIND_FIRST_ZERO \
51 if (i > 0 && !src[i]) \
52 i--; \
53 while (src[i]) \
54 i++
55 #if HAVE_FAST_64BIT
56
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46726398 for (i = 0; i + 1 < length; i += 9) {
57 91958637 if (!((~AV_RN64(src + i) &
58
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46639664 (AV_RN64(src + i) - 0x0100010001000101ULL)) &
59 0x8000800080008080ULL))
60 45318973 continue;
61
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5604597 FIND_FIRST_ZERO;
62
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1320691 STARTCODE_TEST;
63 1212734 i -= 7;
64 }
65 #else
66 for (i = 0; i + 1 < length; i += 5) {
67 if (!((~AV_RN32(src + i) &
68 (AV_RN32(src + i) - 0x01000101U)) &
69 0x80008080U))
70 continue;
71 FIND_FIRST_ZERO;
72 STARTCODE_TEST;
73 i -= 3;
74 }
75 #endif /* HAVE_FAST_64BIT */
76 #else
77 for (i = 0; i + 1 < length; i += 2) {
78 if (src[i])
79 continue;
80 if (i > 0 && src[i - 1] == 0)
81 i--;
82 STARTCODE_TEST;
83 }
84 #endif /* HAVE_FAST_UNALIGNED */
85
86
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194691 if (i >= length - 1 && small_padding) { // no escaped 0
87 116640 nal->data =
88 116640 nal->raw_data = src;
89 116640 nal->size =
90 116640 nal->raw_size = length;
91 116640 return length;
92
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78051 } else if (i > length)
93 22173 i = length;
94
95 78051 dst = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
96
97 78051 memcpy(dst, src, i);
98 78051 si = di = i;
99
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9523200 while (si + 2 < length) {
100 // remove escapes (very rare 1:2^22)
101
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9489835 if (src[si + 2] > 3) {
102 9141742 dst[di++] = src[si++];
103 9141742 dst[di++] = src[si++];
104
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348093 } else if (src[si] == 0 && src[si + 1] == 0 && src[si + 2] != 0) {
105
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65627 if (src[si + 2] == 3) { // escape
106 20941 dst[di++] = 0;
107 20941 dst[di++] = 0;
108 20941 si += 3;
109
110
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20941 if (nal->skipped_bytes_pos) {
111 16968 nal->skipped_bytes++;
112
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16968 if (nal->skipped_bytes_pos_size < nal->skipped_bytes) {
113 20 nal->skipped_bytes_pos_size *= 2;
114
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20 av_assert0(nal->skipped_bytes_pos_size >= nal->skipped_bytes);
115 20 av_reallocp_array(&nal->skipped_bytes_pos,
116 20 nal->skipped_bytes_pos_size,
117 sizeof(*nal->skipped_bytes_pos));
118
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20 if (!nal->skipped_bytes_pos) {
119 nal->skipped_bytes_pos_size = 0;
120 return AVERROR(ENOMEM);
121 }
122 }
123
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16968 if (nal->skipped_bytes_pos)
124 16968 nal->skipped_bytes_pos[nal->skipped_bytes-1] = di - 1;
125 }
126 20941 continue;
127 } else // next start code
128 44686 goto nsc;
129 }
130
131 9424208 dst[di++] = src[si++];
132 }
133
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38273 while (si < length)
134 4908 dst[di++] = src[si++];
135
136 33365 nsc:
137 78051 memset(dst + di, 0, AV_INPUT_BUFFER_PADDING_SIZE);
138
139 78051 nal->data = dst;
140 78051 nal->size = di;
141 78051 nal->raw_data = src;
142 78051 nal->raw_size = si;
143 78051 rbsp->rbsp_buffer_size += si;
144
145 78051 return si;
146 }
147
148 static const char *const hevc_nal_type_name[64] = {
149 "TRAIL_N", // HEVC_NAL_TRAIL_N
150 "TRAIL_R", // HEVC_NAL_TRAIL_R
151 "TSA_N", // HEVC_NAL_TSA_N
152 "TSA_R", // HEVC_NAL_TSA_R
153 "STSA_N", // HEVC_NAL_STSA_N
154 "STSA_R", // HEVC_NAL_STSA_R
155 "RADL_N", // HEVC_NAL_RADL_N
156 "RADL_R", // HEVC_NAL_RADL_R
157 "RASL_N", // HEVC_NAL_RASL_N
158 "RASL_R", // HEVC_NAL_RASL_R
159 "RSV_VCL_N10", // HEVC_NAL_VCL_N10
160 "RSV_VCL_R11", // HEVC_NAL_VCL_R11
161 "RSV_VCL_N12", // HEVC_NAL_VCL_N12
162 "RSV_VLC_R13", // HEVC_NAL_VCL_R13
163 "RSV_VCL_N14", // HEVC_NAL_VCL_N14
164 "RSV_VCL_R15", // HEVC_NAL_VCL_R15
165 "BLA_W_LP", // HEVC_NAL_BLA_W_LP
166 "BLA_W_RADL", // HEVC_NAL_BLA_W_RADL
167 "BLA_N_LP", // HEVC_NAL_BLA_N_LP
168 "IDR_W_RADL", // HEVC_NAL_IDR_W_RADL
169 "IDR_N_LP", // HEVC_NAL_IDR_N_LP
170 "CRA_NUT", // HEVC_NAL_CRA_NUT
171 "RSV_IRAP_VCL22", // HEVC_NAL_RSV_IRAP_VCL22
172 "RSV_IRAP_VCL23", // HEVC_NAL_RSV_IRAP_VCL23
173 "RSV_VCL24", // HEVC_NAL_RSV_VCL24
174 "RSV_VCL25", // HEVC_NAL_RSV_VCL25
175 "RSV_VCL26", // HEVC_NAL_RSV_VCL26
176 "RSV_VCL27", // HEVC_NAL_RSV_VCL27
177 "RSV_VCL28", // HEVC_NAL_RSV_VCL28
178 "RSV_VCL29", // HEVC_NAL_RSV_VCL29
179 "RSV_VCL30", // HEVC_NAL_RSV_VCL30
180 "RSV_VCL31", // HEVC_NAL_RSV_VCL31
181 "VPS", // HEVC_NAL_VPS
182 "SPS", // HEVC_NAL_SPS
183 "PPS", // HEVC_NAL_PPS
184 "AUD", // HEVC_NAL_AUD
185 "EOS_NUT", // HEVC_NAL_EOS_NUT
186 "EOB_NUT", // HEVC_NAL_EOB_NUT
187 "FD_NUT", // HEVC_NAL_FD_NUT
188 "SEI_PREFIX", // HEVC_NAL_SEI_PREFIX
189 "SEI_SUFFIX", // HEVC_NAL_SEI_SUFFIX
190 "RSV_NVCL41", // HEVC_NAL_RSV_NVCL41
191 "RSV_NVCL42", // HEVC_NAL_RSV_NVCL42
192 "RSV_NVCL43", // HEVC_NAL_RSV_NVCL43
193 "RSV_NVCL44", // HEVC_NAL_RSV_NVCL44
194 "RSV_NVCL45", // HEVC_NAL_RSV_NVCL45
195 "RSV_NVCL46", // HEVC_NAL_RSV_NVCL46
196 "RSV_NVCL47", // HEVC_NAL_RSV_NVCL47
197 "UNSPEC48", // HEVC_NAL_UNSPEC48
198 "UNSPEC49", // HEVC_NAL_UNSPEC49
199 "UNSPEC50", // HEVC_NAL_UNSPEC50
200 "UNSPEC51", // HEVC_NAL_UNSPEC51
201 "UNSPEC52", // HEVC_NAL_UNSPEC52
202 "UNSPEC53", // HEVC_NAL_UNSPEC53
203 "UNSPEC54", // HEVC_NAL_UNSPEC54
204 "UNSPEC55", // HEVC_NAL_UNSPEC55
205 "UNSPEC56", // HEVC_NAL_UNSPEC56
206 "UNSPEC57", // HEVC_NAL_UNSPEC57
207 "UNSPEC58", // HEVC_NAL_UNSPEC58
208 "UNSPEC59", // HEVC_NAL_UNSPEC59
209 "UNSPEC60", // HEVC_NAL_UNSPEC60
210 "UNSPEC61", // HEVC_NAL_UNSPEC61
211 "UNSPEC62", // HEVC_NAL_UNSPEC62
212 "UNSPEC63", // HEVC_NAL_UNSPEC63
213 };
214
215 93135 static const char *hevc_nal_unit_name(int nal_type)
216 {
217
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93135 av_assert0(nal_type >= 0 && nal_type < 64);
218 93135 return hevc_nal_type_name[nal_type];
219 }
220
221 static const char *const h264_nal_type_name[32] = {
222 "Unspecified 0", //H264_NAL_UNSPECIFIED
223 "Coded slice of a non-IDR picture", // H264_NAL_SLICE
224 "Coded slice data partition A", // H264_NAL_DPA
225 "Coded slice data partition B", // H264_NAL_DPB
226 "Coded slice data partition C", // H264_NAL_DPC
227 "IDR", // H264_NAL_IDR_SLICE
228 "SEI", // H264_NAL_SEI
229 "SPS", // H264_NAL_SPS
230 "PPS", // H264_NAL_PPS
231 "AUD", // H264_NAL_AUD
232 "End of sequence", // H264_NAL_END_SEQUENCE
233 "End of stream", // H264_NAL_END_STREAM
234 "Filler data", // H264_NAL_FILLER_DATA
235 "SPS extension", // H264_NAL_SPS_EXT
236 "Prefix", // H264_NAL_PREFIX
237 "Subset SPS", // H264_NAL_SUB_SPS
238 "Depth parameter set", // H264_NAL_DPS
239 "Reserved 17", // H264_NAL_RESERVED17
240 "Reserved 18", // H264_NAL_RESERVED18
241 "Auxiliary coded picture without partitioning", // H264_NAL_AUXILIARY_SLICE
242 "Slice extension", // H264_NAL_EXTEN_SLICE
243 "Slice extension for a depth view or a 3D-AVC texture view", // H264_NAL_DEPTH_EXTEN_SLICE
244 "Reserved 22", // H264_NAL_RESERVED22
245 "Reserved 23", // H264_NAL_RESERVED23
246 "Unspecified 24", // H264_NAL_UNSPECIFIED24
247 "Unspecified 25", // H264_NAL_UNSPECIFIED25
248 "Unspecified 26", // H264_NAL_UNSPECIFIED26
249 "Unspecified 27", // H264_NAL_UNSPECIFIED27
250 "Unspecified 28", // H264_NAL_UNSPECIFIED28
251 "Unspecified 29", // H264_NAL_UNSPECIFIED29
252 "Unspecified 30", // H264_NAL_UNSPECIFIED30
253 "Unspecified 31", // H264_NAL_UNSPECIFIED31
254 };
255
256 56951 static const char *h264_nal_unit_name(int nal_type)
257 {
258
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56951 av_assert0(nal_type >= 0 && nal_type < 32);
259 56951 return h264_nal_type_name[nal_type];
260 }
261
262 150088 static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
263 {
264 150088 int size = nal->size;
265 int v;
266
267
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212047 while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0)
268 61959 size--;
269
270
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150088 if (!size)
271 return 0;
272
273 150088 v = nal->data[size - 1];
274
275
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150088 if (size > INT_MAX / 8)
276 return AVERROR(ERANGE);
277 150088 size *= 8;
278
279 /* remove the stop bit and following trailing zeros,
280 * or nothing for damaged bitstreams */
281
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150088 if (v)
282 150088 size -= ff_ctz(v) + 1;
283
284 150088 return size;
285 }
286
287 /**
288 * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
289 * 0 otherwise
290 */
291 93137 static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
292 {
293 93137 GetBitContext *gb = &nal->gb;
294
295
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93137 if (get_bits1(gb) != 0)
296 2 return AVERROR_INVALIDDATA;
297
298 93135 nal->type = get_bits(gb, 6);
299
300 93135 nal->nuh_layer_id = get_bits(gb, 6);
301 93135 nal->temporal_id = get_bits(gb, 3) - 1;
302
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93135 if (nal->temporal_id < 0)
303 return AVERROR_INVALIDDATA;
304
305 93135 av_log(logctx, AV_LOG_DEBUG,
306 "nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n",
307 nal->type, hevc_nal_unit_name(nal->type), nal->nuh_layer_id, nal->temporal_id);
308
309 93135 return 0;
310 }
311
312 56951 static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
313 {
314 56951 GetBitContext *gb = &nal->gb;
315
316
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56951 if (get_bits1(gb) != 0)
317 return AVERROR_INVALIDDATA;
318
319 56951 nal->ref_idc = get_bits(gb, 2);
320 56951 nal->type = get_bits(gb, 5);
321
322 56951 av_log(logctx, AV_LOG_DEBUG,
323 "nal_unit_type: %d(%s), nal_ref_idc: %d\n",
324 nal->type, h264_nal_unit_name(nal->type), nal->ref_idc);
325
326 56951 return 0;
327 }
328
329 143916 static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc)
330 {
331 143916 int i = 0;
332
333
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143916 if (buf + 3 >= next_avc)
334 return next_avc - buf;
335
336
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170162 while (buf + i + 3 < next_avc) {
337
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170162 if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1)
338 143916 break;
339 26246 i++;
340 }
341 143916 return i + 3;
342 }
343
344 54521 static void alloc_rbsp_buffer(H2645RBSP *rbsp, unsigned int size, int use_ref)
345 {
346 54521 int min_size = size;
347
348
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54521 if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
349 goto fail;
350 54521 size += AV_INPUT_BUFFER_PADDING_SIZE;
351
352
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54521 if (rbsp->rbsp_buffer_alloc_size >= size &&
353
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51600 (!rbsp->rbsp_buffer_ref || av_buffer_is_writable(rbsp->rbsp_buffer_ref))) {
354
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51600 av_assert0(rbsp->rbsp_buffer);
355 51600 memset(rbsp->rbsp_buffer + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
356 51600 return;
357 }
358
359
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2921 size = FFMIN(size + size / 16 + 32, INT_MAX);
360
361
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2921 if (rbsp->rbsp_buffer_ref)
362 43 av_buffer_unref(&rbsp->rbsp_buffer_ref);
363 else
364 2878 av_free(rbsp->rbsp_buffer);
365
366 2921 rbsp->rbsp_buffer = av_mallocz(size);
367
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2921 if (!rbsp->rbsp_buffer)
368 goto fail;
369 2921 rbsp->rbsp_buffer_alloc_size = size;
370
371
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2921 if (use_ref) {
372 79 rbsp->rbsp_buffer_ref = av_buffer_create(rbsp->rbsp_buffer, size,
373 NULL, NULL, 0);
374
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79 if (!rbsp->rbsp_buffer_ref)
375 goto fail;
376 }
377
378 2921 return;
379
380 fail:
381 rbsp->rbsp_buffer_alloc_size = 0;
382 if (rbsp->rbsp_buffer_ref) {
383 av_buffer_unref(&rbsp->rbsp_buffer_ref);
384 rbsp->rbsp_buffer = NULL;
385 } else
386 av_freep(&rbsp->rbsp_buffer);
387
388 return;
389 }
390
391 54521 int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
392 void *logctx, int is_nalff, int nal_length_size,
393 enum AVCodecID codec_id, int small_padding, int use_ref)
394 {
395 GetByteContext bc;
396 54521 int consumed, ret = 0;
397
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54521 int next_avc = is_nalff ? 0 : length;
398
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54521 int64_t padding = small_padding ? 0 : MAX_MBPAIR_SIZE;
399
400 54521 bytestream2_init(&bc, buf, length);
401 54521 alloc_rbsp_buffer(&pkt->rbsp, length + padding, use_ref);
402
403
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54521 if (!pkt->rbsp.rbsp_buffer)
404 return AVERROR(ENOMEM);
405
406 54521 pkt->rbsp.rbsp_buffer_size = 0;
407 54521 pkt->nb_nals = 0;
408
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204609 while (bytestream2_get_bytes_left(&bc) >= 4) {
409 H2645NAL *nal;
410 150089 int extract_length = 0;
411 150089 int skip_trailing_zeros = 1;
412
413
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150089 if (bytestream2_tell(&bc) == next_avc) {
414 6173 int i = 0;
415 6173 extract_length = get_nalsize(nal_length_size,
416 bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx);
417
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6173 if (extract_length < 0)
418 1 return extract_length;
419
420 6172 bytestream2_skip(&bc, nal_length_size);
421
422 6172 next_avc = bytestream2_tell(&bc) + extract_length;
423 } else {
424 int buf_index;
425
426
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143916 if (bytestream2_tell(&bc) > next_avc)
427 av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n");
428
429 /* search start code */
430 143916 buf_index = find_next_start_code(bc.buffer, buf + next_avc);
431
432 143916 bytestream2_skip(&bc, buf_index);
433
434
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143916 if (!bytestream2_get_bytes_left(&bc)) {
435 if (pkt->nb_nals > 0) {
436 // No more start codes: we discarded some irrelevant
437 // bytes at the end of the packet.
438 return 0;
439 } else {
440 av_log(logctx, AV_LOG_ERROR, "No start code is found.\n");
441 return AVERROR_INVALIDDATA;
442 }
443 }
444
445
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143916 extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc));
446
447
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143916 if (bytestream2_tell(&bc) >= next_avc) {
448 /* skip to the start of the next NAL */
449 bytestream2_skip(&bc, next_avc - bytestream2_tell(&bc));
450 continue;
451 }
452 }
453
454
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150088 if (pkt->nals_allocated < pkt->nb_nals + 1) {
455 11090 int new_size = pkt->nals_allocated + 1;
456 void *tmp;
457
458
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11090 if (new_size >= INT_MAX / sizeof(*pkt->nals))
459 return AVERROR(ENOMEM);
460
461 11090 tmp = av_fast_realloc(pkt->nals, &pkt->nal_buffer_size, new_size * sizeof(*pkt->nals));
462
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11090 if (!tmp)
463 return AVERROR(ENOMEM);
464
465 11090 pkt->nals = tmp;
466 11090 memset(pkt->nals + pkt->nals_allocated, 0, sizeof(*pkt->nals));
467
468 11090 nal = &pkt->nals[pkt->nb_nals];
469
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11090 nal->skipped_bytes_pos_size = FFMIN(1024, extract_length/3+1); // initial buffer size
470 11090 nal->skipped_bytes_pos = av_malloc_array(nal->skipped_bytes_pos_size, sizeof(*nal->skipped_bytes_pos));
471
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11090 if (!nal->skipped_bytes_pos)
472 return AVERROR(ENOMEM);
473
474 11090 pkt->nals_allocated = new_size;
475 }
476 150088 nal = &pkt->nals[pkt->nb_nals];
477
478 150088 consumed = ff_h2645_extract_rbsp(bc.buffer, extract_length, &pkt->rbsp, nal, small_padding);
479
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150088 if (consumed < 0)
480 return consumed;
481
482
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150088 if (is_nalff && (extract_length != consumed) && extract_length)
483 12 av_log(logctx, AV_LOG_DEBUG,
484 "NALFF: Consumed only %d bytes instead of %d\n",
485 consumed, extract_length);
486
487 150088 bytestream2_skip(&bc, consumed);
488
489 /* see commit 3566042a0 */
490
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245656 if (bytestream2_get_bytes_left(&bc) >= 4 &&
491 95568 bytestream2_peek_be32(&bc) == 0x000001E0)
492 2 skip_trailing_zeros = 0;
493
494 150088 nal->size_bits = get_bit_length(nal, skip_trailing_zeros);
495
496
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150088 if (nal->size <= 0 || nal->size_bits <= 0)
497 continue;
498
499 150088 ret = init_get_bits(&nal->gb, nal->data, nal->size_bits);
500
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150088 if (ret < 0)
501 return ret;
502
503 /* Reset type in case it contains a stale value from a previously parsed NAL */
504 150088 nal->type = 0;
505
506
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150088 if (codec_id == AV_CODEC_ID_HEVC)
507 93137 ret = hevc_parse_nal_header(nal, logctx);
508 else
509 56951 ret = h264_parse_nal_header(nal, logctx);
510
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150088 if (ret < 0) {
511 2 av_log(logctx, AV_LOG_WARNING, "Invalid NAL unit %d, skipping.\n",
512 nal->type);
513 2 continue;
514 }
515
516 150086 pkt->nb_nals++;
517 }
518
519 54520 return 0;
520 }
521
522 3165 void ff_h2645_packet_uninit(H2645Packet *pkt)
523 {
524 int i;
525
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14255 for (i = 0; i < pkt->nals_allocated; i++) {
526 11090 av_freep(&pkt->nals[i].skipped_bytes_pos);
527 }
528 3165 av_freep(&pkt->nals);
529 3165 pkt->nals_allocated = pkt->nal_buffer_size = 0;
530
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3165 if (pkt->rbsp.rbsp_buffer_ref) {
531 36 av_buffer_unref(&pkt->rbsp.rbsp_buffer_ref);
532 36 pkt->rbsp.rbsp_buffer = NULL;
533 } else
534 3129 av_freep(&pkt->rbsp.rbsp_buffer);
535 3165 pkt->rbsp.rbsp_buffer_alloc_size = pkt->rbsp.rbsp_buffer_size = 0;
536 3165 }
537