FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/hevc_parse.c
Date: 2022-01-28 07:56:06
Exec Total Coverage
Lines: 53 67 79.1%
Branches: 26 39 66.7%

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 "bytestream.h"
20 #include "h2645_parse.h"
21 #include "hevc.h"
22 #include "hevc_parse.h"
23
24 437 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;
29 437 int ret = 0;
30 437 H2645Packet pkt = { 0 };
31
32 437 ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff,
33 nal_length_size, AV_CODEC_ID_HEVC, 1, 0);
34
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437 if (ret < 0) {
35 goto done;
36 }
37
38
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1740 for (i = 0; i < pkt.nb_nals; i++) {
39 1304 H2645NAL *nal = &pkt.nals[i];
40
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1304 if (nal->nuh_layer_id > 0)
41 continue;
42
43 /* ignore everything except parameter sets and VCL NALUs */
44
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1304 switch (nal->type) {
45 389 case HEVC_NAL_VPS:
46 389 ret = ff_hevc_decode_nal_vps(&nal->gb, logctx, ps);
47
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389 if (ret < 0)
48 goto done;
49 389 break;
50 386 case HEVC_NAL_SPS:
51 386 ret = ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, apply_defdispwin);
52
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386 if (ret < 0)
53 goto done;
54 386 break;
55 519 case HEVC_NAL_PPS:
56 519 ret = ff_hevc_decode_nal_pps(&nal->gb, logctx, ps);
57
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519 if (ret < 0)
58 1 goto done;
59 518 break;
60 10 case HEVC_NAL_SEI_PREFIX:
61 case HEVC_NAL_SEI_SUFFIX:
62 10 ret = ff_hevc_decode_nal_sei(&nal->gb, logctx, sei, ps, nal->type);
63
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10 if (ret < 0)
64 goto done;
65 10 break;
66 default:
67 av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type);
68 break;
69 }
70 }
71
72 436 done:
73 437 ff_h2645_packet_uninit(&pkt);
74
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437 if (err_recognition & AV_EF_EXPLODE)
75 return ret;
76
77 437 return 0;
78 }
79
80 373 int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps,
81 HEVCSEI *sei, int *is_nalff, int *nal_length_size,
82 int err_recognition, int apply_defdispwin, void *logctx)
83 {
84 373 int ret = 0;
85 GetByteContext gb;
86
87 373 bytestream2_init(&gb, data, size);
88
89
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373 if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
90 /* It seems the extradata is encoded as hvcC format.
91 * Temporarily, we support configurationVersion==0 until 14496-15 3rd
92 * is finalized. When finalized, configurationVersion will be 1 and we
93 * can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
94 int i, j, num_arrays, nal_len_size;
95
96 24 *is_nalff = 1;
97
98 24 bytestream2_skip(&gb, 21);
99 24 nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
100 24 num_arrays = bytestream2_get_byte(&gb);
101
102 /* nal units in the hvcC always have length coded with 2 bytes,
103 * so put a fake nal_length_size = 2 while parsing them */
104 24 *nal_length_size = 2;
105
106 /* Decode nal units from hvcC. */
107
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106 for (i = 0; i < num_arrays; i++) {
108 82 int type = bytestream2_get_byte(&gb) & 0x3f;
109 82 int cnt = bytestream2_get_be16(&gb);
110
111
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170 for (j = 0; j < cnt; j++) {
112 // +2 for the nal size field
113 88 int nalsize = bytestream2_peek_be16(&gb) + 2;
114
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88 if (bytestream2_get_bytes_left(&gb) < nalsize) {
115 av_log(logctx, AV_LOG_ERROR,
116 "Invalid NAL unit size in extradata.\n");
117 return AVERROR_INVALIDDATA;
118 }
119
120 88 ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, sei, *is_nalff,
121 *nal_length_size, err_recognition, apply_defdispwin,
122 logctx);
123
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88 if (ret < 0) {
124 av_log(logctx, AV_LOG_ERROR,
125 "Decoding nal unit %d %d from hvcC failed\n",
126 type, i);
127 return ret;
128 }
129 88 bytestream2_skip(&gb, nalsize);
130 }
131 }
132
133 /* Now store right nal length size, that will be used to parse
134 * all other nals */
135 24 *nal_length_size = nal_len_size;
136 } else {
137 349 *is_nalff = 0;
138 349 ret = hevc_decode_nal_units(data, size, ps, sei, *is_nalff, *nal_length_size,
139 err_recognition, apply_defdispwin, logctx);
140
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349 if (ret < 0)
141 return ret;
142 }
143
144 373 return ret;
145 }
146