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
|
/*
* iLBC decoder/encoder stub
* Copyright (c) 2012 Martin Storsjo
*
* 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 <ilbc.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
static int get_mode(AVCodecContext *avctx)
{
if (avctx->block_align == 38)
return 20;
else if (avctx->block_align == 50)
return 30;
else if (avctx->bit_rate > 0)
return avctx->bit_rate <= 14000 ? 30 : 20;
else
return -1;
}
typedef struct ILBCDecContext {
const AVClass *class;
iLBC_Dec_Inst_t decoder;
int enhance;
} ILBCDecContext;
static const AVOption ilbc_dec_options[] = {
{ "enhance", "Enhance the decoded audio (adds delay)", offsetof(ILBCDecContext, enhance), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM },
{ NULL }
};
static const AVClass ilbc_dec_class = {
.class_name = "libilbc",
.item_name = av_default_item_name,
.option = ilbc_dec_options,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int ilbc_decode_init(AVCodecContext *avctx)
{
ILBCDecContext *s = avctx->priv_data;
int mode;
if ((mode = get_mode(avctx)) < 0) {
av_log(avctx, AV_LOG_ERROR, "iLBC frame mode not indicated\n");
return AVERROR(EINVAL);
}
WebRtcIlbcfix_InitDecode(&s->decoder, mode, s->enhance);
avctx->channels = 1;
avctx->channel_layout = AV_CH_LAYOUT_MONO;
avctx->sample_rate = 8000;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
return 0;
}
static int ilbc_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
ILBCDecContext *s = avctx->priv_data;
AVFrame *frame = data;
int ret;
if (s->decoder.no_of_bytes > buf_size) {
av_log(avctx, AV_LOG_ERROR, "iLBC frame too short (%u, should be %u)\n",
buf_size, s->decoder.no_of_bytes);
return AVERROR_INVALIDDATA;
}
frame->nb_samples = s->decoder.blockl;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
WebRtcIlbcfix_DecodeImpl((int16_t *) frame->data[0], (const uint16_t *) buf, &s->decoder, 1);
*got_frame_ptr = 1;
return s->decoder.no_of_bytes;
}
AVCodec ff_libilbc_decoder = {
.name = "libilbc",
.long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ILBC,
.priv_data_size = sizeof(ILBCDecContext),
.init = ilbc_decode_init,
.decode = ilbc_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.priv_class = &ilbc_dec_class,
};
typedef struct ILBCEncContext {
const AVClass *class;
iLBC_Enc_Inst_t encoder;
int mode;
} ILBCEncContext;
static const AVOption ilbc_enc_options[] = {
{ "mode", "iLBC mode (20 or 30 ms frames)", offsetof(ILBCEncContext, mode), AV_OPT_TYPE_INT, { .i64 = 20 }, 20, 30, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
{ NULL }
};
static const AVClass ilbc_enc_class = {
.class_name = "libilbc",
.item_name = av_default_item_name,
.option = ilbc_enc_options,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int ilbc_encode_init(AVCodecContext *avctx)
{
ILBCEncContext *s = avctx->priv_data;
int mode;
if (avctx->sample_rate != 8000) {
av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
return AVERROR(EINVAL);
}
if (avctx->channels != 1) {
av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
return AVERROR(EINVAL);
}
if ((mode = get_mode(avctx)) > 0)
s->mode = mode;
else
s->mode = s->mode != 30 ? 20 : 30;
WebRtcIlbcfix_InitEncode(&s->encoder, s->mode);
avctx->block_align = s->encoder.no_of_bytes;
avctx->frame_size = s->encoder.blockl;
return 0;
}
static int ilbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
ILBCEncContext *s = avctx->priv_data;
int ret;
if ((ret = ff_alloc_packet2(avctx, avpkt, 50, 0)) < 0)
return ret;
WebRtcIlbcfix_EncodeImpl((uint16_t *) avpkt->data, (const int16_t *) frame->data[0], &s->encoder);
avpkt->size = s->encoder.no_of_bytes;
*got_packet_ptr = 1;
return 0;
}
static const AVCodecDefault ilbc_encode_defaults[] = {
{ "b", "0" },
{ NULL }
};
AVCodec ff_libilbc_encoder = {
.name = "libilbc",
.long_name = NULL_IF_CONFIG_SMALL("iLBC (Internet Low Bitrate Codec)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ILBC,
.priv_data_size = sizeof(ILBCEncContext),
.init = ilbc_encode_init,
.encode2 = ilbc_encode_frame,
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_NONE },
.defaults = ilbc_encode_defaults,
.priv_class = &ilbc_enc_class,
};
|
