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
|
/* $Id: enclame.c,v 1.9 2005/03/05 14:27:05 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "lame/lame.h"
int enclameInit( hb_work_object_t *, hb_job_t * );
int enclameWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void enclameClose( hb_work_object_t * );
hb_work_object_t hb_enclame =
{
WORK_ENCLAME,
"MP3 encoder (libmp3lame)",
enclameInit,
enclameWork,
enclameClose
};
struct hb_work_private_s
{
hb_job_t * job;
/* LAME handle */
lame_global_flags * lame;
int done;
int out_discrete_channels;
unsigned long input_samples;
unsigned long output_bytes;
uint8_t * buf;
hb_list_t * list;
int64_t pts;
};
int enclameInit( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
hb_audio_t * audio = w->audio;
w->private_data = pv;
pv->job = job;
hb_log( "enclame: opening libmp3lame" );
pv->lame = lame_init();
// use ABR
lame_set_VBR( pv->lame, vbr_abr );
lame_set_VBR_mean_bitrate_kbps( pv->lame, audio->config.out.bitrate );
lame_set_in_samplerate( pv->lame, audio->config.out.samplerate );
lame_set_out_samplerate( pv->lame, audio->config.out.samplerate );
pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
// Lame's default encoding mode is JOINT_STEREO. This subtracts signal
// that is "common" to left and right (within some threshold) and encodes
// it separately. This improves quality at low bitrates, but hurts
// imaging (channel separation) at higher bitrates. So if the bitrate
// is suffeciently high, use regular STEREO mode.
if ( pv->out_discrete_channels == 1 )
{
lame_set_mode( pv->lame, MONO );
lame_set_num_channels( pv->lame, 1 );
}
else if ( audio->config.out.bitrate >= 128 )
{
lame_set_mode( pv->lame, STEREO );
}
lame_init_params( pv->lame );
pv->input_samples = 1152 * pv->out_discrete_channels;
pv->output_bytes = LAME_MAXMP3BUFFER;
pv->buf = malloc( pv->input_samples * sizeof( float ) );
pv->list = hb_list_init();
pv->pts = -1;
return 0;
}
/***********************************************************************
* Close
***********************************************************************
*
**********************************************************************/
void enclameClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
lame_close( pv->lame );
hb_list_empty( &pv->list );
free( pv->buf );
free( pv );
w->private_data = NULL;
}
/***********************************************************************
* Encode
***********************************************************************
*
**********************************************************************/
static hb_buffer_t * Encode( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
hb_audio_t * audio = w->audio;
hb_buffer_t * buf;
float samples[2][1152];
uint64_t pts, pos;
int i, j;
if( hb_list_bytes( pv->list ) < pv->input_samples * sizeof( float ) )
{
return NULL;
}
hb_list_getbytes( pv->list, pv->buf, pv->input_samples * sizeof( float ),
&pts, &pos);
memset(samples, 0, 2*1152*sizeof(float));
for( i = 0; i < 1152; i++ )
{
for( j = 0; j < pv->out_discrete_channels; j++ )
{
samples[j][i] = ((float *) pv->buf)[(pv->out_discrete_channels * i + j)];
}
}
buf = hb_buffer_init( pv->output_bytes );
buf->start = pts + 90000 * pos / pv->out_discrete_channels / sizeof( float ) / audio->config.out.samplerate;
buf->stop = buf->start + 90000 * 1152 / audio->config.out.samplerate;
buf->size = lame_encode_buffer_float(
pv->lame, samples[0], samples[1],
1152, buf->data, LAME_MAXMP3BUFFER );
buf->frametype = HB_FRAME_AUDIO;
if( !buf->size )
{
/* Encoding was successful but we got no data. Try to encode
more */
hb_buffer_close( &buf );
return Encode( w );
}
else if( buf->size < 0 )
{
hb_log( "enclame: lame_encode_buffer failed" );
hb_buffer_close( &buf );
return NULL;
}
return buf;
}
/***********************************************************************
* Work
***********************************************************************
*
**********************************************************************/
int enclameWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * in = *buf_in;
hb_buffer_t * buf;
if ( (*buf_in)->size <= 0 )
{
/* EOF on input - send it downstream & say we're done */
if ( pv->done )
{
*buf_out = *buf_in;
*buf_in = NULL;
return HB_WORK_DONE;
}
else
{
pv->done = 1;
hb_fifo_push( w->fifo_in, in);
*buf_in = NULL;
buf = hb_buffer_init( pv->output_bytes );
buf->size = lame_encode_flush( pv->lame, buf->data, LAME_MAXMP3BUFFER );
if( buf->size <= 0 )
{
hb_buffer_close( &buf );
}
*buf_out = buf;
return HB_WORK_OK;
}
}
hb_list_add( pv->list, *buf_in );
*buf_in = NULL;
*buf_out = buf = Encode( w );
while( buf )
{
buf->next = Encode( w );
buf = buf->next;
}
return HB_WORK_OK;
}
|
