GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/h2645_parse.c Lines: 180 215 83.7 %
Date: 2019-11-22 03:34:36 Branches: 123 166 74.1 %

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
185706
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
185706
    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
45338397
    for (i = 0; i + 1 < length; i += 9) {
57
45258756
        if (!((~AV_RN64(src + i) &
58
45258756
               (AV_RN64(src + i) - 0x0100010001000101ULL)) &
59
              0x8000800080008080ULL))
60
43964948
            continue;
61

5488144
        FIND_FIRST_ZERO;
62


1293808
        STARTCODE_TEST;
63
1187743
        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

185706
    if (i >= length - 1 && small_padding) { // no escaped 0
87
110429
        nal->data     =
88
110429
        nal->raw_data = src;
89
110429
        nal->size     =
90
110429
        nal->raw_size = length;
91
110429
        return length;
92
75277
    } else if (i > length)
93
21409
        i = length;
94
95
75277
    nal->rbsp_buffer = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
96
75277
    dst = nal->rbsp_buffer;
97
98
75277
    memcpy(dst, src, i);
99
75277
    si = di = i;
100
8999862
    while (si + 2 < length) {
101
        // remove escapes (very rare 1:2^22)
102
8968203
        if (src[si + 2] > 3) {
103
8637281
            dst[di++] = src[si++];
104
8637281
            dst[di++] = src[si++];
105

330922
        } else if (src[si] == 0 && src[si + 1] == 0 && src[si + 2] != 0) {
106
60940
            if (src[si + 2] == 3) { // escape
107
17322
                dst[di++] = 0;
108
17322
                dst[di++] = 0;
109
17322
                si       += 3;
110
111
17322
                if (nal->skipped_bytes_pos) {
112
15699
                    nal->skipped_bytes++;
113
15699
                    if (nal->skipped_bytes_pos_size < nal->skipped_bytes) {
114
                        nal->skipped_bytes_pos_size *= 2;
115
                        av_assert0(nal->skipped_bytes_pos_size >= nal->skipped_bytes);
116
                        av_reallocp_array(&nal->skipped_bytes_pos,
117
                                nal->skipped_bytes_pos_size,
118
                                sizeof(*nal->skipped_bytes_pos));
119
                        if (!nal->skipped_bytes_pos) {
120
                            nal->skipped_bytes_pos_size = 0;
121
                            return AVERROR(ENOMEM);
122
                        }
123
                    }
124
15699
                    if (nal->skipped_bytes_pos)
125
15699
                        nal->skipped_bytes_pos[nal->skipped_bytes-1] = di - 1;
126
                }
127
17322
                continue;
128
            } else // next start code
129
43618
                goto nsc;
130
        }
131
132
8907263
        dst[di++] = src[si++];
133
    }
134
35975
    while (si < length)
135
4316
        dst[di++] = src[si++];
136
137
31659
nsc:
138
75277
    memset(dst + di, 0, AV_INPUT_BUFFER_PADDING_SIZE);
139
140
75277
    nal->data = dst;
141
75277
    nal->size = di;
142
75277
    nal->raw_data = src;
143
75277
    nal->raw_size = si;
144
75277
    rbsp->rbsp_buffer_size += si;
145
146
75277
    return si;
147
}
148
149
static const char *hevc_nal_type_name[64] = {
150
    "TRAIL_N", // HEVC_NAL_TRAIL_N
151
    "TRAIL_R", // HEVC_NAL_TRAIL_R
152
    "TSA_N", // HEVC_NAL_TSA_N
153
    "TSA_R", // HEVC_NAL_TSA_R
154
    "STSA_N", // HEVC_NAL_STSA_N
155
    "STSA_R", // HEVC_NAL_STSA_R
156
    "RADL_N", // HEVC_NAL_RADL_N
157
    "RADL_R", // HEVC_NAL_RADL_R
158
    "RASL_N", // HEVC_NAL_RASL_N
159
    "RASL_R", // HEVC_NAL_RASL_R
160
    "RSV_VCL_N10", // HEVC_NAL_VCL_N10
161
    "RSV_VCL_R11", // HEVC_NAL_VCL_R11
162
    "RSV_VCL_N12", // HEVC_NAL_VCL_N12
163
    "RSV_VLC_R13", // HEVC_NAL_VCL_R13
164
    "RSV_VCL_N14", // HEVC_NAL_VCL_N14
165
    "RSV_VCL_R15", // HEVC_NAL_VCL_R15
166
    "BLA_W_LP", // HEVC_NAL_BLA_W_LP
167
    "BLA_W_RADL", // HEVC_NAL_BLA_W_RADL
168
    "BLA_N_LP", // HEVC_NAL_BLA_N_LP
169
    "IDR_W_RADL", // HEVC_NAL_IDR_W_RADL
170
    "IDR_N_LP", // HEVC_NAL_IDR_N_LP
171
    "CRA_NUT", // HEVC_NAL_CRA_NUT
172
    "IRAP_IRAP_VCL22", // HEVC_NAL_IRAP_VCL22
173
    "IRAP_IRAP_VCL23", // HEVC_NAL_IRAP_VCL23
174
    "RSV_VCL24", // HEVC_NAL_RSV_VCL24
175
    "RSV_VCL25", // HEVC_NAL_RSV_VCL25
176
    "RSV_VCL26", // HEVC_NAL_RSV_VCL26
177
    "RSV_VCL27", // HEVC_NAL_RSV_VCL27
178
    "RSV_VCL28", // HEVC_NAL_RSV_VCL28
179
    "RSV_VCL29", // HEVC_NAL_RSV_VCL29
180
    "RSV_VCL30", // HEVC_NAL_RSV_VCL30
181
    "RSV_VCL31", // HEVC_NAL_RSV_VCL31
182
    "VPS", // HEVC_NAL_VPS
183
    "SPS", // HEVC_NAL_SPS
184
    "PPS", // HEVC_NAL_PPS
185
    "AUD", // HEVC_NAL_AUD
186
    "EOS_NUT", // HEVC_NAL_EOS_NUT
187
    "EOB_NUT", // HEVC_NAL_EOB_NUT
188
    "FD_NUT", // HEVC_NAL_FD_NUT
189
    "SEI_PREFIX", // HEVC_NAL_SEI_PREFIX
190
    "SEI_SUFFIX", // HEVC_NAL_SEI_SUFFIX
191
    "RSV_NVCL41", // HEVC_NAL_RSV_NVCL41
192
    "RSV_NVCL42", // HEVC_NAL_RSV_NVCL42
193
    "RSV_NVCL43", // HEVC_NAL_RSV_NVCL43
194
    "RSV_NVCL44", // HEVC_NAL_RSV_NVCL44
195
    "RSV_NVCL45", // HEVC_NAL_RSV_NVCL45
196
    "RSV_NVCL46", // HEVC_NAL_RSV_NVCL46
197
    "RSV_NVCL47", // HEVC_NAL_RSV_NVCL47
198
    "UNSPEC48", // HEVC_NAL_UNSPEC48
199
    "UNSPEC49", // HEVC_NAL_UNSPEC49
200
    "UNSPEC50", // HEVC_NAL_UNSPEC50
201
    "UNSPEC51", // HEVC_NAL_UNSPEC51
202
    "UNSPEC52", // HEVC_NAL_UNSPEC52
203
    "UNSPEC53", // HEVC_NAL_UNSPEC53
204
    "UNSPEC54", // HEVC_NAL_UNSPEC54
205
    "UNSPEC55", // HEVC_NAL_UNSPEC55
206
    "UNSPEC56", // HEVC_NAL_UNSPEC56
207
    "UNSPEC57", // HEVC_NAL_UNSPEC57
208
    "UNSPEC58", // HEVC_NAL_UNSPEC58
209
    "UNSPEC59", // HEVC_NAL_UNSPEC59
210
    "UNSPEC60", // HEVC_NAL_UNSPEC60
211
    "UNSPEC61", // HEVC_NAL_UNSPEC61
212
    "UNSPEC62", // HEVC_NAL_UNSPEC62
213
    "UNSPEC63", // HEVC_NAL_UNSPEC63
214
};
215
216
92808
static const char *hevc_nal_unit_name(int nal_type)
217
{
218

92808
    av_assert0(nal_type >= 0 && nal_type < 64);
219
92808
    return hevc_nal_type_name[nal_type];
220
}
221
222
static const char *h264_nal_type_name[32] = {
223
    "Unspecified 0", //H264_NAL_UNSPECIFIED
224
    "Coded slice of a non-IDR picture", // H264_NAL_SLICE
225
    "Coded slice data partition A", // H264_NAL_DPA
226
    "Coded slice data partition B", // H264_NAL_DPB
227
    "Coded slice data partition C", // H264_NAL_DPC
228
    "IDR", // H264_NAL_IDR_SLICE
229
    "SEI", // H264_NAL_SEI
230
    "SPS", // H264_NAL_SPS
231
    "PPS", // H264_NAL_PPS
232
    "AUD", // H264_NAL_AUD
233
    "End of sequence", // H264_NAL_END_SEQUENCE
234
    "End of stream", // H264_NAL_END_STREAM
235
    "Filler data", // H264_NAL_FILLER_DATA
236
    "SPS extension", // H264_NAL_SPS_EXT
237
    "Prefix", // H264_NAL_PREFIX
238
    "Subset SPS", // H264_NAL_SUB_SPS
239
    "Depth parameter set", // H264_NAL_DPS
240
    "Reserved 17", // H264_NAL_RESERVED17
241
    "Reserved 18", // H264_NAL_RESERVED18
242
    "Auxiliary coded picture without partitioning", // H264_NAL_AUXILIARY_SLICE
243
    "Slice extension", // H264_NAL_EXTEN_SLICE
244
    "Slice extension for a depth view or a 3D-AVC texture view", // H264_NAL_DEPTH_EXTEN_SLICE
245
    "Reserved 22", // H264_NAL_RESERVED22
246
    "Reserved 23", // H264_NAL_RESERVED23
247
    "Unspecified 24", // H264_NAL_UNSPECIFIED24
248
    "Unspecified 25", // H264_NAL_UNSPECIFIED25
249
    "Unspecified 26", // H264_NAL_UNSPECIFIED26
250
    "Unspecified 27", // H264_NAL_UNSPECIFIED27
251
    "Unspecified 28", // H264_NAL_UNSPECIFIED28
252
    "Unspecified 29", // H264_NAL_UNSPECIFIED29
253
    "Unspecified 30", // H264_NAL_UNSPECIFIED30
254
    "Unspecified 31", // H264_NAL_UNSPECIFIED31
255
};
256
257
55004
static const char *h264_nal_unit_name(int nal_type)
258
{
259

55004
    av_assert0(nal_type >= 0 && nal_type < 32);
260
55004
    return h264_nal_type_name[nal_type];
261
}
262
263
147814
static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
264
{
265
147814
    int size = nal->size;
266
    int v;
267
268

208959
    while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0)
269
61145
        size--;
270
271
147814
    if (!size)
272
        return 0;
273
274
147814
    v = nal->data[size - 1];
275
276
147814
    if (size > INT_MAX / 8)
277
        return AVERROR(ERANGE);
278
147814
    size *= 8;
279
280
    /* remove the stop bit and following trailing zeros,
281
     * or nothing for damaged bitstreams */
282
147814
    if (v)
283
147814
        size -= ff_ctz(v) + 1;
284
285
147814
    return size;
286
}
287
288
/**
289
 * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
290
 * 0 if the unit should be skipped, 1 otherwise
291
 */
292
92810
static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
293
{
294
92810
    GetBitContext *gb = &nal->gb;
295
    int nuh_layer_id;
296
297
92810
    if (get_bits1(gb) != 0)
298
2
        return AVERROR_INVALIDDATA;
299
300
92808
    nal->type = get_bits(gb, 6);
301
302
92808
    nuh_layer_id   = get_bits(gb, 6);
303
92808
    nal->temporal_id = get_bits(gb, 3) - 1;
304
92808
    if (nal->temporal_id < 0)
305
        return AVERROR_INVALIDDATA;
306
307
92808
    av_log(logctx, AV_LOG_DEBUG,
308
           "nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n",
309
           nal->type, hevc_nal_unit_name(nal->type), nuh_layer_id, nal->temporal_id);
310
311
92808
    return nuh_layer_id == 0;
312
}
313
314
55004
static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
315
{
316
55004
    GetBitContext *gb = &nal->gb;
317
318
55004
    if (get_bits1(gb) != 0)
319
        return AVERROR_INVALIDDATA;
320
321
55004
    nal->ref_idc = get_bits(gb, 2);
322
55004
    nal->type    = get_bits(gb, 5);
323
324
55004
    av_log(logctx, AV_LOG_DEBUG,
325
           "nal_unit_type: %d(%s), nal_ref_idc: %d\n",
326
           nal->type, h264_nal_unit_name(nal->type), nal->ref_idc);
327
328
55004
    return 1;
329
}
330
331
142882
static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc)
332
{
333
142882
    int i = 0;
334
335
142882
    if (buf + 3 >= next_avc)
336
        return next_avc - buf;
337
338
168901
    while (buf + i + 3 < next_avc) {
339

168901
        if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1)
340
142882
            break;
341
26019
        i++;
342
    }
343
142882
    return i + 3;
344
}
345
346
53477
static void alloc_rbsp_buffer(H2645RBSP *rbsp, unsigned int size, int use_ref)
347
{
348
53477
    int min_size = size;
349
350
53477
    if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
351
        goto fail;
352
53477
    size += AV_INPUT_BUFFER_PADDING_SIZE;
353
354
53477
    if (rbsp->rbsp_buffer_alloc_size >= size &&
355

51015
        (!rbsp->rbsp_buffer_ref || av_buffer_is_writable(rbsp->rbsp_buffer_ref))) {
356
51015
        av_assert0(rbsp->rbsp_buffer);
357
51015
        memset(rbsp->rbsp_buffer + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
358
51015
        return;
359
    }
360
361
2462
    size = FFMIN(size + size / 16 + 32, INT_MAX);
362
363
2462
    if (rbsp->rbsp_buffer_ref)
364
42
        av_buffer_unref(&rbsp->rbsp_buffer_ref);
365
    else
366
2420
        av_free(rbsp->rbsp_buffer);
367
368
2462
    rbsp->rbsp_buffer = av_mallocz(size);
369
2462
    if (!rbsp->rbsp_buffer)
370
        goto fail;
371
2462
    rbsp->rbsp_buffer_alloc_size = size;
372
373
2462
    if (use_ref) {
374
77
        rbsp->rbsp_buffer_ref = av_buffer_create(rbsp->rbsp_buffer, size,
375
                                                 NULL, NULL, 0);
376
77
        if (!rbsp->rbsp_buffer_ref)
377
            goto fail;
378
    }
379
380
2462
    return;
381
382
fail:
383
    rbsp->rbsp_buffer_alloc_size = 0;
384
    if (rbsp->rbsp_buffer_ref) {
385
        av_buffer_unref(&rbsp->rbsp_buffer_ref);
386
        rbsp->rbsp_buffer = NULL;
387
    } else
388
        av_freep(&rbsp->rbsp_buffer);
389
390
    return;
391
}
392
393
53477
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
394
                          void *logctx, int is_nalff, int nal_length_size,
395
                          enum AVCodecID codec_id, int small_padding, int use_ref)
396
{
397
    GetByteContext bc;
398
53477
    int consumed, ret = 0;
399
53477
    int next_avc = is_nalff ? 0 : length;
400
53477
    int64_t padding = small_padding ? 0 : MAX_MBPAIR_SIZE;
401
402
53477
    bytestream2_init(&bc, buf, length);
403
53477
    alloc_rbsp_buffer(&pkt->rbsp, length + padding, use_ref);
404
405
53477
    if (!pkt->rbsp.rbsp_buffer)
406
        return AVERROR(ENOMEM);
407
408
53477
    pkt->rbsp.rbsp_buffer_size = 0;
409
53477
    pkt->nb_nals = 0;
410
201291
    while (bytestream2_get_bytes_left(&bc) >= 4) {
411
        H2645NAL *nal;
412
147815
        int extract_length = 0;
413
147815
        int skip_trailing_zeros = 1;
414
415
147815
        if (bytestream2_tell(&bc) == next_avc) {
416
4933
            int i = 0;
417
4933
            extract_length = get_nalsize(nal_length_size,
418
4933
                                         bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx);
419
4933
            if (extract_length < 0)
420
1
                return extract_length;
421
422
4932
            bytestream2_skip(&bc, nal_length_size);
423
424
4932
            next_avc = bytestream2_tell(&bc) + extract_length;
425
        } else {
426
            int buf_index;
427
428
142882
            if (bytestream2_tell(&bc) > next_avc)
429
                av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n");
430
431
            /* search start code */
432
142882
            buf_index = find_next_start_code(bc.buffer, buf + next_avc);
433
434
142882
            bytestream2_skip(&bc, buf_index);
435
436
142882
            if (!bytestream2_get_bytes_left(&bc)) {
437
                if (pkt->nb_nals > 0) {
438
                    // No more start codes: we discarded some irrelevant
439
                    // bytes at the end of the packet.
440
                    return 0;
441
                } else {
442
                    av_log(logctx, AV_LOG_ERROR, "No start code is found.\n");
443
                    return AVERROR_INVALIDDATA;
444
                }
445
            }
446
447
142882
            extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc));
448
449
142882
            if (bytestream2_tell(&bc) >= next_avc) {
450
                /* skip to the start of the next NAL */
451
                bytestream2_skip(&bc, next_avc - bytestream2_tell(&bc));
452
                continue;
453
            }
454
        }
455
456
147814
        if (pkt->nals_allocated < pkt->nb_nals + 1) {
457
10464
            int new_size = pkt->nals_allocated + 1;
458
            void *tmp;
459
460
10464
            if (new_size >= INT_MAX / sizeof(*pkt->nals))
461
                return AVERROR(ENOMEM);
462
463
10464
            tmp = av_fast_realloc(pkt->nals, &pkt->nal_buffer_size, new_size * sizeof(*pkt->nals));
464
10464
            if (!tmp)
465
                return AVERROR(ENOMEM);
466
467
10464
            pkt->nals = tmp;
468
10464
            memset(pkt->nals + pkt->nals_allocated, 0, sizeof(*pkt->nals));
469
470
10464
            nal = &pkt->nals[pkt->nb_nals];
471
10464
            nal->skipped_bytes_pos_size = 1024; // initial buffer size
472
10464
            nal->skipped_bytes_pos = av_malloc_array(nal->skipped_bytes_pos_size, sizeof(*nal->skipped_bytes_pos));
473
10464
            if (!nal->skipped_bytes_pos)
474
                return AVERROR(ENOMEM);
475
476
10464
            pkt->nals_allocated = new_size;
477
        }
478
147814
        nal = &pkt->nals[pkt->nb_nals];
479
480
147814
        consumed = ff_h2645_extract_rbsp(bc.buffer, extract_length, &pkt->rbsp, nal, small_padding);
481
147814
        if (consumed < 0)
482
            return consumed;
483
484

147814
        if (is_nalff && (extract_length != consumed) && extract_length)
485
12
            av_log(logctx, AV_LOG_DEBUG,
486
                   "NALFF: Consumed only %d bytes instead of %d\n",
487
                   consumed, extract_length);
488
489
147814
        pkt->nb_nals++;
490
491
147814
        bytestream2_skip(&bc, consumed);
492
493
        /* see commit 3566042a0 */
494

242152
        if (bytestream2_get_bytes_left(&bc) >= 4 &&
495
94338
            bytestream2_peek_be32(&bc) == 0x000001E0)
496
2
            skip_trailing_zeros = 0;
497
498
147814
        nal->size_bits = get_bit_length(nal, skip_trailing_zeros);
499
500
147814
        ret = init_get_bits(&nal->gb, nal->data, nal->size_bits);
501
147814
        if (ret < 0)
502
            return ret;
503
504
147814
        if (codec_id == AV_CODEC_ID_HEVC)
505
92810
            ret = hevc_parse_nal_header(nal, logctx);
506
        else
507
55004
            ret = h264_parse_nal_header(nal, logctx);
508

147814
        if (ret <= 0 || nal->size <= 0 || nal->size_bits <= 0) {
509
2
            if (ret < 0) {
510
2
                av_log(logctx, AV_LOG_WARNING, "Invalid NAL unit %d, skipping.\n",
511
                       nal->type);
512
            }
513
2
            pkt->nb_nals--;
514
        }
515
    }
516
517
53476
    return 0;
518
}
519
520
2628
void ff_h2645_packet_uninit(H2645Packet *pkt)
521
{
522
    int i;
523
13092
    for (i = 0; i < pkt->nals_allocated; i++) {
524
10464
        av_freep(&pkt->nals[i].skipped_bytes_pos);
525
    }
526
2628
    av_freep(&pkt->nals);
527
2628
    pkt->nals_allocated = pkt->nal_buffer_size = 0;
528
2628
    if (pkt->rbsp.rbsp_buffer_ref) {
529
35
        av_buffer_unref(&pkt->rbsp.rbsp_buffer_ref);
530
35
        pkt->rbsp.rbsp_buffer = NULL;
531
    } else
532
2593
        av_freep(&pkt->rbsp.rbsp_buffer);
533
2628
    pkt->rbsp.rbsp_buffer_alloc_size = pkt->rbsp.rbsp_buffer_size = 0;
534
2628
}