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
|
/*
* Interface to libshine for mp3 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
*/
#include <shine/layer3.h>
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "audio_frame_queue.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "mpegaudio.h"
#include "mpegaudiodecheader.h"
#define BUFFER_SIZE (4096 * 20)
typedef struct SHINEContext {
shine_config_t config;
shine_t shine;
uint8_t buffer[BUFFER_SIZE];
int buffer_index;
AudioFrameQueue afq;
} SHINEContext;
static av_cold int libshine_encode_init(AVCodecContext *avctx)
{
SHINEContext *s = avctx->priv_data;
shine_set_config_mpeg_defaults(&s->config.mpeg);
if (avctx->bit_rate)
s->config.mpeg.bitr = avctx->bit_rate / 1000;
s->config.mpeg.mode = avctx->ch_layout.nb_channels == 2 ? STEREO : MONO;
s->config.wave.samplerate = avctx->sample_rate;
s->config.wave.channels = avctx->ch_layout.nb_channels == 2 ? PCM_STEREO : PCM_MONO;
if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) {
av_log(avctx, AV_LOG_ERROR, "invalid configuration\n");
return AVERROR(EINVAL);
}
s->shine = shine_initialise(&s->config);
if (!s->shine)
return AVERROR(ENOMEM);
avctx->frame_size = shine_samples_per_pass(s->shine);
ff_af_queue_init(avctx, &s->afq);
return 0;
}
static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr)
{
SHINEContext *s = avctx->priv_data;
MPADecodeHeader hdr;
unsigned char *data;
int written;
int ret, len;
if (frame)
data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written);
else
data = shine_flush(s->shine, &written);
if (written < 0)
return -1;
if (written > 0) {
if (s->buffer_index + written > BUFFER_SIZE) {
av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n");
return AVERROR_BUG;
}
memcpy(s->buffer + s->buffer_index, data, written);
s->buffer_index += written;
}
if (frame) {
if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
return ret;
}
if (s->buffer_index < 4 || !s->afq.frame_count)
return 0;
if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) {
av_log(avctx, AV_LOG_ERROR, "free format output not supported\n");
return -1;
}
len = hdr.frame_size;
if (len <= s->buffer_index) {
if ((ret = ff_get_encode_buffer(avctx, avpkt, len, 0)))
return ret;
memcpy(avpkt->data, s->buffer, len);
s->buffer_index -= len;
memmove(s->buffer, s->buffer + len, s->buffer_index);
ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
&avpkt->duration);
*got_packet_ptr = 1;
}
return 0;
}
static av_cold int libshine_encode_close(AVCodecContext *avctx)
{
SHINEContext *s = avctx->priv_data;
ff_af_queue_close(&s->afq);
shine_close(s->shine);
return 0;
}
static const int libshine_sample_rates[] = {
44100, 48000, 32000, 0
};
const FFCodec ff_libshine_encoder = {
.p.name = "libshine",
CODEC_LONG_NAME("libshine MP3 (MPEG audio layer 3)"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_MP3,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
.caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
.priv_data_size = sizeof(SHINEContext),
.init = libshine_encode_init,
FF_CODEC_ENCODE_CB(libshine_encode_frame),
.close = libshine_encode_close,
.p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
.p.supported_samplerates = libshine_sample_rates,
.p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO,
AV_CHANNEL_LAYOUT_STEREO,
{ 0 },
},
.p.wrapper_name = "libshine",
};
|
