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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* HEVC MP4 to Annex B byte stream format filter
* copyright (c) 2015 Anton Khirnov
*
* 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 <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "bsf.h"
#include "bsf_internal.h"
#include "bytestream.h"
#include "defs.h"
#include "hevc.h"
#define MIN_HEVCC_LENGTH 23
typedef struct HEVCBSFContext {
uint8_t length_size;
int extradata_parsed;
} HEVCBSFContext;
static int hevc_extradata_to_annexb(AVBSFContext *ctx)
{
GetByteContext gb;
int length_size, num_arrays, i, j;
int ret = 0;
uint8_t *new_extradata = NULL;
size_t new_extradata_size = 0;
bytestream2_init(&gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
bytestream2_skip(&gb, 21);
length_size = (bytestream2_get_byte(&gb) & 3) + 1;
num_arrays = bytestream2_get_byte(&gb);
for (i = 0; i < num_arrays; i++) {
int type = bytestream2_get_byte(&gb) & 0x3f;
int cnt = bytestream2_get_be16(&gb);
if (!(type == HEVC_NAL_VPS || type == HEVC_NAL_SPS || type == HEVC_NAL_PPS ||
type == HEVC_NAL_SEI_PREFIX || type == HEVC_NAL_SEI_SUFFIX)) {
av_log(ctx, AV_LOG_ERROR, "Invalid NAL unit type in extradata: %d\n",
type);
ret = AVERROR_INVALIDDATA;
goto fail;
}
for (j = 0; j < cnt; j++) {
int nalu_len = bytestream2_get_be16(&gb);
if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
ret = av_reallocp(&new_extradata, new_extradata_size + nalu_len + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
goto fail;
AV_WB32(new_extradata + new_extradata_size, 1); // add the startcode
bytestream2_get_buffer(&gb, new_extradata + new_extradata_size + 4, nalu_len);
new_extradata_size += 4 + nalu_len;
memset(new_extradata + new_extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
}
av_freep(&ctx->par_out->extradata);
ctx->par_out->extradata = new_extradata;
ctx->par_out->extradata_size = new_extradata_size;
if (!new_extradata_size)
av_log(ctx, AV_LOG_WARNING, "No parameter sets in the extradata\n");
return length_size;
fail:
av_freep(&new_extradata);
return ret;
}
static int hevc_mp4toannexb_init(AVBSFContext *ctx)
{
HEVCBSFContext *s = ctx->priv_data;
int ret;
if (ctx->par_in->extradata_size < MIN_HEVCC_LENGTH ||
AV_RB24(ctx->par_in->extradata) == 1 ||
AV_RB32(ctx->par_in->extradata) == 1) {
av_log(ctx, AV_LOG_VERBOSE,
"The input looks like it is Annex B already\n");
} else {
ret = hevc_extradata_to_annexb(ctx);
if (ret < 0)
return ret;
s->length_size = ret;
s->extradata_parsed = 1;
}
return 0;
}
static int hevc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
{
HEVCBSFContext *s = ctx->priv_data;
AVPacket *in;
GetByteContext gb;
int got_irap = 0;
int i, ret = 0;
ret = ff_bsf_get_packet(ctx, &in);
if (ret < 0)
return ret;
if (!s->extradata_parsed) {
av_packet_move_ref(out, in);
av_packet_free(&in);
return 0;
}
bytestream2_init(&gb, in->data, in->size);
while (bytestream2_get_bytes_left(&gb)) {
uint32_t nalu_size = 0;
int nalu_type;
int is_irap, add_extradata, extra_size, prev_size;
if (bytestream2_get_bytes_left(&gb) < s->length_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
for (i = 0; i < s->length_size; i++)
nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb);
if (nalu_size < 2 || nalu_size > bytestream2_get_bytes_left(&gb)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f;
/* prepend extradata to IRAP frames */
is_irap = nalu_type >= 16 && nalu_type <= 23;
add_extradata = is_irap && !got_irap;
extra_size = add_extradata * ctx->par_out->extradata_size;
got_irap |= is_irap;
if (FFMIN(INT_MAX, SIZE_MAX) < 4ULL + nalu_size + extra_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
prev_size = out->size;
ret = av_grow_packet(out, 4 + nalu_size + extra_size);
if (ret < 0)
goto fail;
if (extra_size)
memcpy(out->data + prev_size, ctx->par_out->extradata, extra_size);
AV_WB32(out->data + prev_size + extra_size, 1);
bytestream2_get_buffer(&gb, out->data + prev_size + 4 + extra_size, nalu_size);
}
ret = av_packet_copy_props(out, in);
if (ret < 0)
goto fail;
fail:
if (ret < 0)
av_packet_unref(out);
av_packet_free(&in);
return ret;
}
static const enum AVCodecID codec_ids[] = {
AV_CODEC_ID_HEVC, AV_CODEC_ID_NONE,
};
const FFBitStreamFilter ff_hevc_mp4toannexb_bsf = {
.p.name = "hevc_mp4toannexb",
.p.codec_ids = codec_ids,
.priv_data_size = sizeof(HEVCBSFContext),
.init = hevc_mp4toannexb_init,
.filter = hevc_mp4toannexb_filter,
};
|
