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