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
|
/*
* 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 "adts_header.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "decode.h"
typedef struct FTRContext {
AVCodecContext *aac_avctx[64]; // wrapper context for AAC
int nb_context;
AVPacket *packet;
AVFrame *frame;
} FTRContext;
static av_cold int ftr_init(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
const AVCodec *codec;
int ret;
if (avctx->ch_layout.nb_channels > 64 ||
avctx->ch_layout.nb_channels <= 0)
return AVERROR(EINVAL);
s->packet = av_packet_alloc();
if (!s->packet)
return AVERROR(ENOMEM);
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
s->nb_context = avctx->ch_layout.nb_channels;
codec = avcodec_find_decoder(AV_CODEC_ID_AAC);
if (!codec)
return AVERROR_BUG;
for (int i = 0; i < s->nb_context; i++) {
s->aac_avctx[i] = avcodec_alloc_context3(codec);
if (!s->aac_avctx[i])
return AVERROR(ENOMEM);
ret = avcodec_open2(s->aac_avctx[i], codec, NULL);
if (ret < 0)
return ret;
}
avctx->sample_fmt = s->aac_avctx[0]->sample_fmt;
if (!av_sample_fmt_is_planar(avctx->sample_fmt))
return AVERROR(EINVAL);
return 0;
}
static int ftr_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
FTRContext *s = avctx->priv_data;
GetBitContext gb;
int ret, ch_offset = 0;
ret = init_get_bits8(&gb, avpkt->data, avpkt->size);
if (ret < 0)
return ret;
frame->nb_samples = 0;
for (int i = 0; i < s->nb_context; i++) {
AVCodecContext *codec_avctx = s->aac_avctx[i];
GetBitContext gb2 = gb;
AACADTSHeaderInfo hdr_info;
int size;
if (get_bits_left(&gb) < 64)
return AVERROR_INVALIDDATA;
memset(&hdr_info, 0, sizeof(hdr_info));
size = ff_adts_header_parse(&gb2, &hdr_info);
if (size <= 0 || size * 8 > get_bits_left(&gb))
return AVERROR_INVALIDDATA;
if (size > s->packet->size) {
ret = av_grow_packet(s->packet, size - s->packet->size);
if (ret < 0)
return ret;
}
ret = av_packet_make_writable(s->packet);
if (ret < 0)
return ret;
memcpy(s->packet->data, avpkt->data + (get_bits_count(&gb) >> 3), size);
s->packet->size = size;
if (size > 12) {
uint8_t *buf = s->packet->data;
if (buf[3] & 0x20) {
int tmp = buf[8];
buf[ 9] = ~buf[9];
buf[11] = ~buf[11];
buf[12] = ~buf[12];
buf[ 8] = ~buf[10];
buf[10] = ~tmp;
}
}
ret = avcodec_send_packet(codec_avctx, s->packet);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
return ret;
}
ret = avcodec_receive_frame(codec_avctx, s->frame);
if (ret < 0)
return ret;
if (!avctx->sample_rate) {
avctx->sample_rate = codec_avctx->sample_rate;
} else {
if (avctx->sample_rate != codec_avctx->sample_rate)
return AVERROR_INVALIDDATA;
}
if (!frame->nb_samples) {
frame->nb_samples = s->frame->nb_samples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
} else {
if (frame->nb_samples != s->frame->nb_samples)
return AVERROR_INVALIDDATA;
}
skip_bits_long(&gb, size * 8);
if (ch_offset + s->frame->ch_layout.nb_channels > avctx->ch_layout.nb_channels)
return AVERROR_INVALIDDATA;
if (avctx->sample_fmt != codec_avctx->sample_fmt)
return AVERROR_INVALIDDATA;
for (int ch = 0; ch < s->frame->ch_layout.nb_channels; ch++)
memcpy(frame->extended_data[ch_offset + ch],
s->frame->extended_data[ch],
av_get_bytes_per_sample(codec_avctx->sample_fmt) * s->frame->nb_samples);
ch_offset += s->frame->ch_layout.nb_channels;
if (ch_offset >= avctx->ch_layout.nb_channels)
break;
}
*got_frame = 1;
return get_bits_count(&gb) >> 3;
}
static void ftr_flush(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
for (int i = 0; i < s->nb_context; i++)
avcodec_flush_buffers(s->aac_avctx[i]);
}
static av_cold int ftr_close(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
for (int i = 0; i < s->nb_context; i++)
avcodec_free_context(&s->aac_avctx[i]);
av_packet_free(&s->packet);
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_ftr_decoder = {
.p.name = "ftr",
.p.long_name = NULL_IF_CONFIG_SMALL("FTR Voice"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_FTR,
.init = ftr_init,
FF_CODEC_DECODE_CB(ftr_decode_frame),
.close = ftr_close,
.flush = ftr_flush,
.priv_data_size = sizeof(FTRContext),
.p.capabilities =
#if FF_API_SUBFRAMES
AV_CODEC_CAP_SUBFRAMES |
#endif
AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
|
