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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
|
/**
* @file h265/decode.c H.265 Decode
*
* Copyright (C) 2010 Creytiv.com
*/
#include <re.h>
#include <rem.h>
#include <baresip.h>
#include <libavutil/pixdesc.h>
#include <libavcodec/avcodec.h>
#include "h265.h"
enum {
FU_HDR_SIZE = 1
};
enum {
DECODE_MAXSZ = 524288,
};
struct fu {
unsigned s:1;
unsigned e:1;
unsigned type:5;
};
struct viddec_state {
AVCodecContext *ctx;
AVFrame *pict;
struct mbuf *mb;
size_t frag_start;
bool frag;
uint16_t frag_seq;
};
static void destructor(void *arg)
{
struct viddec_state *vds = arg;
if (vds->ctx) {
avcodec_close(vds->ctx);
av_free(vds->ctx);
}
if (vds->pict)
av_free(vds->pict);
mem_deref(vds->mb);
}
int h265_decode_update(struct viddec_state **vdsp, const struct vidcodec *vc,
const char *fmtp)
{
struct viddec_state *vds;
AVCodec *codec;
int err = 0;
(void)vc;
(void)fmtp;
if (!vdsp)
return EINVAL;
vds = *vdsp;
if (vds)
return 0;
/* HEVC = H.265 */
codec = avcodec_find_decoder(AV_CODEC_ID_HEVC);
if (!codec) {
warning("h265: could not find H265 decoder\n");
return ENOSYS;
}
vds = mem_zalloc(sizeof(*vds), destructor);
if (!vds)
return ENOMEM;
vds->mb = mbuf_alloc(1024);
if (!vds->mb) {
err = ENOMEM;
goto out;
}
vds->pict = av_frame_alloc();
if (!vds->pict) {
err = ENOMEM;
goto out;
}
vds->ctx = avcodec_alloc_context3(codec);
if (!vds->ctx) {
err = ENOMEM;
goto out;
}
if (avcodec_open2(vds->ctx, codec, NULL) < 0) {
err = ENOMEM;
goto out;
}
out:
if (err)
mem_deref(vds);
else
*vdsp = vds;
return err;
}
static inline int fu_decode(struct fu *fu, struct mbuf *mb)
{
uint8_t v;
if (mbuf_get_left(mb) < 1)
return EBADMSG;
v = mbuf_read_u8(mb);
fu->s = v>>7 & 0x1;
fu->e = v>>6 & 0x1;
fu->type = v>>0 & 0x3f;
return 0;
}
static inline int16_t seq_diff(uint16_t x, uint16_t y)
{
return (int16_t)(y - x);
}
static inline void fragment_rewind(struct viddec_state *vds)
{
vds->mb->pos = vds->frag_start;
vds->mb->end = vds->frag_start;
}
int h265_decode(struct viddec_state *vds, struct vidframe *frame,
bool marker, uint16_t seq, struct mbuf *mb)
{
static const uint8_t nal_seq[3] = {0, 0, 1};
int err, ret, got_picture, i;
struct h265_nal hdr;
AVPacket avpkt;
enum vidfmt fmt;
if (!vds || !frame || !mb)
return EINVAL;
err = h265_nal_decode(&hdr, mbuf_buf(mb));
if (err)
return err;
mbuf_advance(mb, H265_HDR_SIZE);
#if 1
debug("h265: decode: %s type=%2d %s\n",
h265_is_keyframe(hdr.nal_unit_type) ? "<KEY>" : " ",
hdr.nal_unit_type,
h265_nalunit_name(hdr.nal_unit_type));
#endif
if (vds->frag && hdr.nal_unit_type != H265_NAL_FU) {
debug("h265: lost fragments; discarding previous NAL\n");
fragment_rewind(vds);
vds->frag = false;
}
/* handle NAL types */
if (0 <= hdr.nal_unit_type && hdr.nal_unit_type <= 40) {
mb->pos -= H265_HDR_SIZE;
err = mbuf_write_mem(vds->mb, nal_seq, 3);
err |= mbuf_write_mem(vds->mb, mbuf_buf(mb),mbuf_get_left(mb));
if (err)
goto out;
}
else if (H265_NAL_FU == hdr.nal_unit_type) {
struct fu fu;
err = fu_decode(&fu, mb);
if (err)
return err;
if (fu.s) {
if (vds->frag) {
debug("h265: lost fragments; ignoring NAL\n");
fragment_rewind(vds);
}
vds->frag_start = vds->mb->pos;
vds->frag = true;
hdr.nal_unit_type = fu.type;
err = mbuf_write_mem(vds->mb, nal_seq, 3);
err = h265_nal_encode_mbuf(vds->mb, &hdr);
if (err)
goto out;
}
else {
if (!vds->frag) {
debug("h265: ignoring fragment\n");
return 0;
}
if (seq_diff(vds->frag_seq, seq) != 1) {
debug("h265: lost fragments detected\n");
fragment_rewind(vds);
vds->frag = false;
return 0;
}
}
err = mbuf_write_mem(vds->mb, mbuf_buf(mb), mbuf_get_left(mb));
if (err)
goto out;
if (fu.e)
vds->frag = false;
vds->frag_seq = seq;
}
else {
warning("h265: unknown NAL type %u\n", hdr.nal_unit_type);
return ENOSYS;
}
if (!marker) {
if (vds->mb->end > DECODE_MAXSZ) {
warning("h265: decode buffer size exceeded\n");
err = ENOMEM;
goto out;
}
return 0;
}
if (vds->frag) {
err = EPROTO;
goto out;
}
av_init_packet(&avpkt);
avpkt.data = vds->mb->buf;
avpkt.size = (int)vds->mb->end;
ret = avcodec_decode_video2(vds->ctx, vds->pict, &got_picture, &avpkt);
if (ret < 0) {
debug("h265: decode error\n");
err = EPROTO;
goto out;
}
if (!got_picture) {
/* debug("h265: no picture\n"); */
goto out;
}
switch (vds->pict->format) {
case PIX_FMT_YUV420P:
fmt = VID_FMT_YUV420P;
break;
#if 0
case PIX_FMT_YUV444P:
fmt = VID_FMT_YUV444;
break;
#endif
default:
warning("h265: decode: bad pixel format (%i) (%s)\n",
vds->pict->format,
av_get_pix_fmt_name(vds->pict->format));
goto out;
}
for (i=0; i<4; i++) {
frame->data[i] = vds->pict->data[i];
frame->linesize[i] = vds->pict->linesize[i];
}
frame->size.w = vds->ctx->width;
frame->size.h = vds->ctx->height;
frame->fmt = fmt;
out:
mbuf_rewind(vds->mb);
vds->frag = false;
return err;
}
|
