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
|
/*
* codec2 encoder/decoder using libcodec2
* Copyright (c) 2017 Tomas Härdin
*
* 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 <codec2/codec2.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "libavutil/opt.h"
#include "codec_internal.h"
#include "decode.h"
#include "encode.h"
#include "codec2utils.h"
typedef struct {
const AVClass *class;
struct CODEC2 *codec;
int mode;
} LibCodec2Context;
static const AVOption options[] = {
//not AV_OPT_FLAG_DECODING_PARAM since mode should come from the demuxer
//1300 (aka FreeDV 1600) is the most common mode on-the-air, default to it here as well
CODEC2_AVOPTIONS("codec2 mode", LibCodec2Context, 0, 4 /*CODEC2_MODE_1300*/, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_ENCODING_PARAM),
{ NULL },
};
static const AVClass libcodec2_enc_class = {
.class_name = "libcodec2 encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static av_cold int libcodec2_init_common(AVCodecContext *avctx, int mode)
{
LibCodec2Context *c2 = avctx->priv_data;
//Grab mode name from options, unless it's some weird number.
const char *modename = mode >= 0 && mode <= CODEC2_MODE_MAX ? options[mode+1].name : "?";
c2->codec = codec2_create(mode);
if (!c2->codec) {
//Out of memory or unsupported mode. The latter seems most likely,
//but we can't tell for sure with the current API.
goto libcodec2_init_common_error;
}
avctx->frame_size = codec2_samples_per_frame(c2->codec);
avctx->block_align = (codec2_bits_per_frame(c2->codec) + 7) / 8;
if (avctx->frame_size <= 0 || avctx->block_align <= 0) {
//codec2_create() may succeed for some modes but still fail at codec2_samples_per_frame()
//example is -mode 700C on libcodec2 0.4
codec2_destroy(c2->codec);
c2->codec = NULL;
goto libcodec2_init_common_error;
}
codec2_set_natural_or_gray(c2->codec, 1);
return 0;
libcodec2_init_common_error:
av_log(avctx, AV_LOG_ERROR,
"Mode %i (%s) not supported with the linked version of libcodec2\n",
mode, modename);
return AVERROR(EINVAL);
}
static av_cold int libcodec2_init_decoder(AVCodecContext *avctx)
{
avctx->sample_rate = 8000;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
av_channel_layout_uninit(&avctx->ch_layout);
avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
if (avctx->extradata_size != CODEC2_EXTRADATA_SIZE) {
av_log(avctx, AV_LOG_ERROR, "must have exactly %i bytes of extradata (got %i)\n",
CODEC2_EXTRADATA_SIZE, avctx->extradata_size);
return AVERROR_INVALIDDATA;
}
return libcodec2_init_common(avctx, codec2_mode_from_extradata(avctx->extradata));
}
static av_cold int libcodec2_init_encoder(AVCodecContext *avctx)
{
LibCodec2Context *c2 = avctx->priv_data;
//will need to be smarter once we get wideband support
if (avctx->sample_rate != 8000 ||
avctx->ch_layout.nb_channels != 1 ||
avctx->sample_fmt != AV_SAMPLE_FMT_S16) {
av_log(avctx, AV_LOG_ERROR, "only 8 kHz 16-bit mono allowed\n");
return AVERROR(EINVAL);
}
avctx->extradata = av_mallocz(CODEC2_EXTRADATA_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata) {
return AVERROR(ENOMEM);
}
avctx->extradata_size = CODEC2_EXTRADATA_SIZE;
codec2_make_extradata(avctx->extradata, c2->mode);
return libcodec2_init_common(avctx, c2->mode);
}
static av_cold int libcodec2_close(AVCodecContext *avctx)
{
LibCodec2Context *c2 = avctx->priv_data;
codec2_destroy(c2->codec);
return 0;
}
static int libcodec2_decode(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *pkt)
{
LibCodec2Context *c2 = avctx->priv_data;
int ret, nframes, i;
const uint8_t *input;
int16_t *output;
nframes = pkt->size / avctx->block_align;
frame->nb_samples = avctx->frame_size * nframes;
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0) {
return ret;
}
input = pkt->data;
output = (int16_t *)frame->data[0];
for (i = 0; i < nframes; i++) {
codec2_decode(c2->codec, output, input);
input += avctx->block_align;
output += avctx->frame_size;
}
*got_frame_ptr = nframes > 0;
return nframes * avctx->block_align;
}
static int libcodec2_encode(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
LibCodec2Context *c2 = avctx->priv_data;
int16_t *samples = (int16_t *)frame->data[0];
int ret = ff_get_encode_buffer(avctx, avpkt, avctx->block_align, 0);
if (ret < 0) {
return ret;
}
codec2_encode(c2->codec, avpkt->data, samples);
*got_packet_ptr = 1;
return 0;
}
const FFCodec ff_libcodec2_decoder = {
.p.name = "libcodec2",
CODEC_LONG_NAME("codec2 decoder using libcodec2"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_CODEC2,
.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF,
.p.supported_samplerates = (const int[]){ 8000, 0 },
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
.p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO, { 0 } },
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
.priv_data_size = sizeof(LibCodec2Context),
.init = libcodec2_init_decoder,
.close = libcodec2_close,
FF_CODEC_DECODE_CB(libcodec2_decode),
#if FF_API_OLD_CHANNEL_LAYOUT
.p.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
#endif
};
const FFCodec ff_libcodec2_encoder = {
.p.name = "libcodec2",
CODEC_LONG_NAME("codec2 encoder using libcodec2"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_CODEC2,
.p.capabilities = AV_CODEC_CAP_DR1,
.p.supported_samplerates = (const int[]){ 8000, 0 },
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
.p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO, { 0 } },
.p.priv_class = &libcodec2_enc_class,
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
.priv_data_size = sizeof(LibCodec2Context),
.init = libcodec2_init_encoder,
.close = libcodec2_close,
FF_CODEC_ENCODE_CB(libcodec2_encode),
#if FF_API_OLD_CHANNEL_LAYOUT
.p.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
#endif
};
|
