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
|
/*
* Copyright (C) 2008 David Conrad
*
* 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 <speex/speex.h>
#include <speex/speex_header.h>
#include <speex/speex_stereo.h>
#include <speex/speex_callbacks.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "internal.h"
typedef struct LibSpeexContext {
SpeexBits bits;
SpeexStereoState stereo;
void *dec_state;
int frame_size;
int pktsize;
} LibSpeexContext;
static av_cold int libspeex_decode_init(AVCodecContext *avctx)
{
LibSpeexContext *s = avctx->priv_data;
const SpeexMode *mode;
SpeexHeader *header = NULL;
int spx_mode;
if (avctx->extradata && avctx->extradata_size >= 80) {
header = speex_packet_to_header(avctx->extradata,
avctx->extradata_size);
if (!header)
av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
}
if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) {
int quality;
if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) {
av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n");
return AVERROR_INVALIDDATA;
}
quality = avctx->extradata[37];
if (quality > 10) {
av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode %d.\n", quality);
return AVERROR_PATCHWELCOME;
}
s->pktsize = ((const int[]){5,10,15,20,20,28,28,38,38,46,62})[quality];
spx_mode = 0;
} else if (header) {
avctx->sample_rate = header->rate;
avctx->channels = header->nb_channels;
spx_mode = header->mode;
speex_header_free(header);
} else {
switch (avctx->sample_rate) {
case 8000: spx_mode = 0; break;
case 16000: spx_mode = 1; break;
case 32000: spx_mode = 2; break;
default:
/* libspeex can handle any mode if initialized as ultra-wideband */
av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
"Decoding as 32kHz ultra-wideband\n",
avctx->sample_rate);
spx_mode = 2;
}
}
mode = speex_lib_get_mode(spx_mode);
if (!mode) {
av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
return AVERROR_INVALIDDATA;
}
s->frame_size = 160 << spx_mode;
if (!avctx->sample_rate)
avctx->sample_rate = 8000 << spx_mode;
if (avctx->channels < 1 || avctx->channels > 2) {
/* libspeex can handle mono or stereo if initialized as stereo */
av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
"Decoding as stereo.\n", avctx->channels);
avctx->channels = 2;
}
avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
AV_CH_LAYOUT_MONO;
speex_bits_init(&s->bits);
s->dec_state = speex_decoder_init(mode);
if (!s->dec_state) {
av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
return -1;
}
if (avctx->channels == 2) {
SpeexCallback callback;
callback.callback_id = SPEEX_INBAND_STEREO;
callback.func = speex_std_stereo_request_handler;
callback.data = &s->stereo;
s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
}
return 0;
}
static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
LibSpeexContext *s = avctx->priv_data;
AVFrame *frame = data;
int16_t *output;
int ret, consumed = 0;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
/* get output buffer */
frame->nb_samples = s->frame_size;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
output = (int16_t *)frame->data[0];
/* if there is not enough data left for the smallest possible frame or the
next 5 bits are a terminator code, reset the libspeex buffer using the
current packet, otherwise ignore the current packet and keep decoding
frames from the libspeex buffer. */
if (speex_bits_remaining(&s->bits) < 5 ||
speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
/* check for flush packet */
if (!buf || !buf_size) {
*got_frame_ptr = 0;
return buf_size;
}
if (s->pktsize && buf_size == 62)
buf_size = s->pktsize;
/* set new buffer */
speex_bits_read_from(&s->bits, buf, buf_size);
consumed = avpkt->size;
}
/* decode a single frame */
ret = speex_decode_int(s->dec_state, &s->bits, output);
if (ret <= -2) {
av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
return AVERROR_INVALIDDATA;
}
if (avctx->channels == 2)
speex_decode_stereo_int(output, s->frame_size, &s->stereo);
*got_frame_ptr = 1;
if (!avctx->bit_rate)
speex_decoder_ctl(s->dec_state, SPEEX_GET_BITRATE, &avctx->bit_rate);
return consumed;
}
static av_cold int libspeex_decode_close(AVCodecContext *avctx)
{
LibSpeexContext *s = avctx->priv_data;
speex_bits_destroy(&s->bits);
speex_decoder_destroy(s->dec_state);
return 0;
}
static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
{
LibSpeexContext *s = avctx->priv_data;
speex_bits_reset(&s->bits);
}
AVCodec ff_libspeex_decoder = {
.name = "libspeex",
.long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_SPEEX,
.priv_data_size = sizeof(LibSpeexContext),
.init = libspeex_decode_init,
.close = libspeex_decode_close,
.decode = libspeex_decode_frame,
.flush = libspeex_decode_flush,
.capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
};
|
