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
|
/* Copyright (C) 2021 Vladimir Sukhonosov <xornet@xornet.org>
* Copyright (C) 2021 Martins Mozeiko <martins.mozeiko@gmail.com>
* All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
extern "C" {
#include <libavutil/imgutils.h>
#include <libavcodec/version.h>
}
#if LIBAVCODEC_VERSION_MAJOR > 57 || LIBAVCODEC_VERSION_MAJOR == 57 && LIBAVCODEC_VERSION_MINOR >= 37
#define FFMPEG_DECODE_VIDEO2_DEPRECATED
#endif
#if LIBAVCODEC_VERSION_MAJOR >= 58
#define FFMPEG_INIT_PACKET_DEPRECATED
#endif
#include <rfb/Exception.h>
#include <rfb/LogWriter.h>
#include <rfb/PixelBuffer.h>
#include <rfb/H264LibavDecoderContext.h>
using namespace rfb;
static LogWriter vlog("H264LibavDecoderContext");
bool H264LibavDecoderContext::initCodec() {
os::AutoMutex lock(&mutex);
sws = NULL;
swsBuffer = NULL;
h264WorkBuffer = NULL;
h264WorkBufferLength = 0;
const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
if (!codec)
{
vlog.error("Codec not found");
return false;
}
parser = av_parser_init(codec->id);
if (!parser)
{
vlog.error("Could not create H264 parser");
return false;
}
avctx = avcodec_alloc_context3(codec);
if (!avctx)
{
av_parser_close(parser);
vlog.error("Could not allocate video codec context");
return false;
}
frame = av_frame_alloc();
if (!frame)
{
av_parser_close(parser);
avcodec_free_context(&avctx);
vlog.error("Could not allocate video frame");
return false;
}
if (avcodec_open2(avctx, codec, NULL) < 0)
{
av_parser_close(parser);
avcodec_free_context(&avctx);
av_frame_free(&frame);
vlog.error("Could not open codec");
return false;
}
int numBytes = av_image_get_buffer_size(AV_PIX_FMT_RGB32, rect.width(), rect.height(), 1);
swsBuffer = new uint8_t[numBytes];
initialized = true;
return true;
}
void H264LibavDecoderContext::freeCodec() {
os::AutoMutex lock(&mutex);
if (!initialized)
return;
av_parser_close(parser);
avcodec_free_context(&avctx);
av_frame_free(&frame);
delete[] swsBuffer;
free(h264WorkBuffer);
initialized = false;
}
// We need to reallocate buffer because AVPacket uses non-const pointer.
// We don't want to const_cast our buffer somewhere. So we would rather to maintain context's own buffer
// Also avcodec requires a right padded buffer
uint8_t* H264LibavDecoderContext::makeH264WorkBuffer(const uint8_t* buffer, uint32_t len)
{
uint32_t reserve_len = len + len % AV_INPUT_BUFFER_PADDING_SIZE;
if (!h264WorkBuffer || reserve_len > h264WorkBufferLength)
{
h264WorkBuffer = (uint8_t*)realloc(h264WorkBuffer, reserve_len);
if (h264WorkBuffer == NULL) {
throw Exception("H264LibavDecoderContext: Unable to allocate memory");
}
h264WorkBufferLength = reserve_len;
}
memcpy(h264WorkBuffer, buffer, len);
memset(h264WorkBuffer + len, 0, h264WorkBufferLength - len);
return h264WorkBuffer;
}
void H264LibavDecoderContext::decode(const uint8_t* h264_in_buffer,
uint32_t len,
ModifiablePixelBuffer* pb) {
os::AutoMutex lock(&mutex);
if (!initialized)
return;
uint8_t* h264_work_buffer = makeH264WorkBuffer(h264_in_buffer, len);
#ifdef FFMPEG_INIT_PACKET_DEPRECATED
AVPacket *packet = av_packet_alloc();
#else
AVPacket *packet = new AVPacket();
av_init_packet(packet);
#endif
int ret;
int frames_received = 0;
while (len)
{
ret = av_parser_parse2(parser, avctx, &packet->data, &packet->size, h264_work_buffer, len, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (ret < 0)
{
vlog.error("Error while parsing");
break;
}
// We need to slap on tv to make it work here (don't ask me why)
if (!packet->size && len == static_cast<uint32_t>(ret))
ret = av_parser_parse2(parser, avctx, &packet->data, &packet->size, h264_work_buffer, len, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (ret < 0)
{
vlog.error("Error while parsing");
break;
}
h264_work_buffer += ret;
len -= ret;
if (!ret)
{
packet->size = len;
packet->data = h264_work_buffer;
len = 0;
}
if (!packet->size)
continue;
#ifndef FFMPEG_DECODE_VIDEO2_DEPRECATED
int got_frame;
ret = avcodec_decode_video2(avctx, frame, &got_frame, packet);
if (ret < 0 || !got_frame)
{
vlog.error("Error during decoding");
break;
}
#else
ret = avcodec_send_packet(avctx, packet);
if (ret < 0)
{
vlog.error("Error sending a packet to decoding");
break;
}
ret = avcodec_receive_frame(avctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
break;
else if (ret < 0)
{
vlog.error("Error during decoding");
break;
}
#endif
frames_received++;
}
#ifdef FFMPEG_INIT_PACKET_DEPRECATED
packet->size = 0;
packet->data = NULL;
av_packet_free(&packet);
#else
delete packet;
#endif
if (!frames_received)
return;
if (!frame->height)
return;
sws = sws_getCachedContext(sws, frame->width, frame->height, avctx->pix_fmt,
frame->width, frame->height, AV_PIX_FMT_RGB32,
0, NULL, NULL, NULL);
int stride;
pb->getBuffer(rect, &stride);
int dst_linesize = stride * pb->getPF().bpp/8; // stride is in pixels, linesize is in bytes (stride x4). We need bytes
sws_scale(sws, frame->data, frame->linesize, 0, frame->height, &swsBuffer, &dst_linesize);
pb->imageRect(rect, swsBuffer, stride);
}
|
