FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/hevc/parse.c
Date: 2026-07-21 08:37:06
Exec Total Coverage
Lines: 54 67 80.6%
Functions: 2 2 100.0%
Branches: 28 41 68.3%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "libavcodec/bytestream.h"
20 #include "libavcodec/h2645_parse.h"
21 #include "hevc.h"
22 #include "parse.h"
23
24 1035 static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
25 HEVCSEI *sei, int is_nalff, int nal_length_size,
26 int err_recognition, int apply_defdispwin, void *logctx)
27 {
28 int i;
29 1035 int ret = 0;
30
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 1035 int flags = (H2645_FLAG_IS_NALFF * !!is_nalff) | H2645_FLAG_SMALL_PADDING;
31 1035 H2645Packet pkt = { 0 };
32
33 1035 ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx,
34 nal_length_size, AV_CODEC_ID_HEVC, flags);
35
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 1035 if (ret < 0) {
36 ✗ goto done;
37 }
38
39
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 3049 for (i = 0; i < pkt.nb_nals; i++) {
40 2015 H2645NAL *nal = &pkt.nals[i];
41 /* ignore everything except parameter sets and VCL NALUs */
42
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 2015 switch (nal->type) {
43 581 case HEVC_NAL_VPS:
44 581 ret = ff_hevc_decode_nal_vps(&nal->gb, logctx, ps);
45
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 581 if (ret < 0)
46 ✗ goto done;
47 581 break;
48 598 case HEVC_NAL_SPS:
49 598 ret = ff_hevc_decode_nal_sps(&nal->gb, logctx, ps,
50 598 nal->nuh_layer_id, apply_defdispwin);
51
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 598 if (ret < 0)
52 ✗ goto done;
53 598 break;
54 735 case HEVC_NAL_PPS:
55 735 ret = ff_hevc_decode_nal_pps(&nal->gb, logctx, ps);
56
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 735 if (ret < 0)
57 1 goto done;
58 734 break;
59 101 case HEVC_NAL_SEI_PREFIX:
60 case HEVC_NAL_SEI_SUFFIX:
61 101 ret = ff_hevc_decode_nal_sei(&nal->gb, logctx, sei, ps, nal->type);
62
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 101 if (ret < 0)
63 ✗ goto done;
64 101 break;
65 ✗ default:
66 ✗ av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type);
67 ✗ break;
68 }
69 }
70
71 1034 done:
72 1035 ff_h2645_packet_uninit(&pkt);
73
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 1035 if (err_recognition & AV_EF_EXPLODE)
74 ✗ return ret;
75
76 1035 return 0;
77 }
78
79 564 int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps,
80 HEVCSEI *sei, int *is_nalff, int *nal_length_size,
81 int err_recognition, int apply_defdispwin, void *logctx)
82 {
83 564 int ret = 0;
84 GetByteContext gb;
85
86 564 bytestream2_init(&gb, data, size);
87
88 /* data[0] == 1 is configurationVersion from 14496-15.
89 * data[0] == 0 is for backward compatibility predates the standard.
90 *
91 * Minimum number of bytes of hvcC with 0 numOfArrays is 23.
92 */
93
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 564 if (size >= 23 && ((data[0] == 1) || (data[0] == 0 && (data[1] || data[2] > 1)))) {
94 /* It seems the extradata is encoded as hvcC format. */
95 int i, j, num_arrays, nal_len_size;
96
97 172 *is_nalff = 1;
98
99 172 bytestream2_skip(&gb, 21);
100 172 nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
101 172 num_arrays = bytestream2_get_byte(&gb);
102
103 /* nal units in the hvcC always have length coded with 2 bytes,
104 * so put a fake nal_length_size = 2 while parsing them */
105 172 *nal_length_size = 2;
106
107 /* Decode nal units from hvcC. */
108
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 777 for (i = 0; i < num_arrays; i++) {
109 605 int type = bytestream2_get_byte(&gb) & 0x3f;
110 605 int cnt = bytestream2_get_be16(&gb);
111
112
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 1248 for (j = 0; j < cnt; j++) {
113 // +2 for the nal size field
114 643 int nalsize = bytestream2_peek_be16(&gb) + 2;
115
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 643 if (bytestream2_get_bytes_left(&gb) < nalsize) {
116 ✗ av_log(logctx, AV_LOG_ERROR,
117 "Invalid NAL unit size in extradata.\n");
118 ✗ return AVERROR_INVALIDDATA;
119 }
120
121 643 ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, sei, *is_nalff,
122 *nal_length_size, err_recognition, apply_defdispwin,
123 logctx);
124
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 643 if (ret < 0) {
125 ✗ av_log(logctx, AV_LOG_ERROR,
126 "Decoding nal unit %d %d from hvcC failed\n",
127 type, i);
128 ✗ return ret;
129 }
130 643 bytestream2_skip(&gb, nalsize);
131 }
132 }
133
134 /* Now store right nal length size, that will be used to parse
135 * all other nals */
136 172 *nal_length_size = nal_len_size;
137 } else {
138 392 *is_nalff = 0;
139 392 ret = hevc_decode_nal_units(data, size, ps, sei, *is_nalff, *nal_length_size,
140 err_recognition, apply_defdispwin, logctx);
141
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 392 if (ret < 0)
142 ✗ return ret;
143 }
144
145 564 return ret;
146 }
147