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
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* Interface to libtwolame for mp2 encoding
* Copyright (c) 2012 Paul B Mahol
*
* 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
*/
/**
* @file
* Interface to libtwolame for mp2 encoding.
*/
#include <twolame.h>
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "mpegaudio.h"
typedef struct TWOLAMEContext {
AVClass *class;
int mode;
int psymodel;
int energy;
int error_protection;
int copyright;
int original;
int verbosity;
twolame_options *glopts;
int64_t next_pts;
} TWOLAMEContext;
static av_cold int twolame_encode_close(AVCodecContext *avctx)
{
TWOLAMEContext *s = avctx->priv_data;
twolame_close(&s->glopts);
return 0;
}
static av_cold int twolame_encode_init(AVCodecContext *avctx)
{
TWOLAMEContext *s = avctx->priv_data;
int ret;
avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME;
avctx->initial_padding = 512 - 32 + 1;
s->glopts = twolame_init();
if (!s->glopts)
return AVERROR(ENOMEM);
twolame_set_verbosity(s->glopts, s->verbosity);
twolame_set_mode(s->glopts, s->mode);
twolame_set_psymodel(s->glopts, s->psymodel);
twolame_set_energy_levels(s->glopts, s->energy);
twolame_set_error_protection(s->glopts, s->error_protection);
twolame_set_copyright(s->glopts, s->copyright);
twolame_set_original(s->glopts, s->original);
twolame_set_num_channels(s->glopts, avctx->channels);
twolame_set_in_samplerate(s->glopts, avctx->sample_rate);
twolame_set_out_samplerate(s->glopts, avctx->sample_rate);
if (!avctx->bit_rate)
avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000;
if (avctx->flags & AV_CODEC_FLAG_QSCALE || !avctx->bit_rate) {
twolame_set_VBR(s->glopts, TRUE);
twolame_set_VBR_level(s->glopts,
avctx->global_quality / (float) FF_QP2LAMBDA);
av_log(avctx, AV_LOG_WARNING,
"VBR in MP2 is a hack, use another codec that supports it.\n");
} else {
twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000);
}
ret = twolame_init_params(s->glopts);
if (ret) {
twolame_encode_close(avctx);
return AVERROR_UNKNOWN;
}
return 0;
}
static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
TWOLAMEContext *s = avctx->priv_data;
int ret;
if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE, 0)) < 0)
return ret;
if (frame) {
switch (avctx->sample_fmt) {
case AV_SAMPLE_FMT_FLT:
ret = twolame_encode_buffer_float32_interleaved(s->glopts,
(const float *)frame->data[0],
frame->nb_samples,
avpkt->data,
avpkt->size);
break;
case AV_SAMPLE_FMT_FLTP:
ret = twolame_encode_buffer_float32(s->glopts,
(const float *)frame->data[0],
(const float *)frame->data[1],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
case AV_SAMPLE_FMT_S16:
ret = twolame_encode_buffer_interleaved(s->glopts,
(const short int *)frame->data[0],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
case AV_SAMPLE_FMT_S16P:
ret = twolame_encode_buffer(s->glopts,
(const short int *)frame->data[0],
(const short int *)frame->data[1],
frame->nb_samples,
avpkt->data, avpkt->size);
break;
default:
av_log(avctx, AV_LOG_ERROR,
"Unsupported sample format %d.\n", avctx->sample_fmt);
return AVERROR_BUG;
}
} else {
ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size);
}
if (!ret) // no bytes written
return 0;
if (ret < 0) // twolame error
return AVERROR_UNKNOWN;
if (frame) {
avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
if (frame->pts != AV_NOPTS_VALUE)
avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding);
} else {
avpkt->pts = s->next_pts;
}
// this is for setting pts for flushed packet(s).
if (avpkt->pts != AV_NOPTS_VALUE)
s->next_pts = avpkt->pts + avpkt->duration;
av_shrink_packet(avpkt, ret);
*got_packet_ptr = 1;
return 0;
}
#define OFFSET(x) offsetof(TWOLAMEContext, x)
#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
{ "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" },
{ "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" },
{ "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" },
{ "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" },
{ "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" },
{ "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
{ "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
{ "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE},
{ NULL },
};
static const AVClass twolame_class = {
.class_name = "libtwolame encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVCodecDefault twolame_defaults[] = {
{ "b", "0" },
{ NULL },
};
static const int twolame_samplerates[] = {
16000, 22050, 24000, 32000, 44100, 48000, 0
};
AVCodec ff_libtwolame_encoder = {
.name = "libtwolame",
.long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_MP2,
.priv_data_size = sizeof(TWOLAMEContext),
.init = twolame_encode_init,
.encode2 = twolame_encode_frame,
.close = twolame_encode_close,
.capabilities = AV_CODEC_CAP_DELAY,
.defaults = twolame_defaults,
.priv_class = &twolame_class,
.sample_fmts = (const enum AVSampleFormat[]) {
AV_SAMPLE_FMT_FLT,
AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE
},
.channel_layouts = (const uint64_t[]) {
AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO,
0 },
.supported_samplerates = twolame_samplerates,
};
|
