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
|
/*
* RTP parser for loss tolerant payload format for MP3 audio (RFC 5219)
* Copyright (c) 2015 Gilles Chanteperdrix <gch@xenomai.org>
*
* 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 "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "avio_internal.h"
#include "rtpdec_formats.h"
struct PayloadContext {
unsigned adu_size;
unsigned cur_size;
uint32_t timestamp;
uint8_t *split_buf;
int split_pos, split_buf_size, split_pkts;
AVIOContext *fragment;
};
static void mpa_robust_close_context(PayloadContext *data)
{
ffio_free_dyn_buf(&data->fragment);
av_free(data->split_buf);
}
static int mpa_robust_parse_rtp_header(AVFormatContext *ctx,
const uint8_t *buf, int len,
unsigned *adu_size, unsigned *cont)
{
unsigned header_size;
if (len < 2) {
av_log(ctx, AV_LOG_ERROR, "Invalid %d bytes packet\n", len);
return AVERROR_INVALIDDATA;
}
*cont = !!(buf[0] & 0x80);
if (!(buf[0] & 0x40)) {
header_size = 1;
*adu_size = buf[0] & ~0xc0;
} else {
header_size = 2;
*adu_size = AV_RB16(buf) & ~0xc000;
}
return header_size;
}
static int mpa_robust_parse_packet(AVFormatContext *ctx, PayloadContext *data,
AVStream *st, AVPacket *pkt,
uint32_t *timestamp, const uint8_t *buf,
int len, uint16_t seq, int flags)
{
unsigned adu_size, continuation;
int err, header_size;
if (!buf) {
buf = &data->split_buf[data->split_pos];
len = data->split_buf_size - data->split_pos;
header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size,
&continuation);
if (header_size < 0) {
av_freep(&data->split_buf);
return header_size;
}
buf += header_size;
len -= header_size;
if (continuation || adu_size > len) {
av_freep(&data->split_buf);
av_log(ctx, AV_LOG_ERROR, "Invalid frame\n");
return AVERROR_INVALIDDATA;
}
if (av_new_packet(pkt, adu_size)) {
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
return AVERROR(ENOMEM);
}
pkt->stream_index = st->index;
memcpy(pkt->data, buf, adu_size);
data->split_pos += header_size + adu_size;
if (data->split_pos == data->split_buf_size) {
av_freep(&data->split_buf);
return 0;
}
return 1;
}
header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size,
&continuation);
if (header_size < 0)
return header_size;
buf += header_size;
len -= header_size;
if (!continuation && adu_size <= len) {
/* One or more complete frames */
if (av_new_packet(pkt, adu_size)) {
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
return AVERROR(ENOMEM);
}
pkt->stream_index = st->index;
memcpy(pkt->data, buf, adu_size);
buf += adu_size;
len -= adu_size;
if (len) {
data->split_buf_size = len;
data->split_buf = av_malloc(data->split_buf_size);
data->split_pos = 0;
if (!data->split_buf) {
av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
memcpy(data->split_buf, buf, data->split_buf_size);
return 1;
}
return 0;
} else if (!continuation) { /* && adu_size > len */
/* First fragment */
ffio_free_dyn_buf(&data->fragment);
data->adu_size = adu_size;
data->cur_size = len;
data->timestamp = *timestamp;
err = avio_open_dyn_buf(&data->fragment);
if (err < 0)
return err;
avio_write(data->fragment, buf, len);
return AVERROR(EAGAIN);
}
/* else continuation == 1 */
/* Fragment other than first */
if (!data->fragment) {
av_log(ctx, AV_LOG_WARNING,
"Received packet without a start fragment; dropping.\n");
return AVERROR(EAGAIN);
}
if (adu_size != data->adu_size ||
data->timestamp != *timestamp) {
ffio_free_dyn_buf(&data->fragment);
av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
return AVERROR_INVALIDDATA;
}
avio_write(data->fragment, buf, len);
data->cur_size += len;
if (data->cur_size < data->adu_size)
return AVERROR(EAGAIN);
err = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
if (err < 0) {
av_log(ctx, AV_LOG_ERROR,
"Error occurred when getting fragment buffer.\n");
return err;
}
return 0;
}
RTPDynamicProtocolHandler ff_mpeg_audio_robust_dynamic_handler = {
.enc_name = "mpa-robust",
.codec_type = AVMEDIA_TYPE_AUDIO,
.codec_id = AV_CODEC_ID_MP3ADU,
.need_parsing = AVSTREAM_PARSE_HEADERS,
.priv_data_size = sizeof(PayloadContext),
.close = mpa_robust_close_context,
.parse_packet = mpa_robust_parse_packet,
};
|
