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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 David Bryant
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "codeclib.h"
#include "libwavpack/wavpack.h"
CODEC_HEADER
#define BUFFER_SIZE 4096
static int32_t temp_buffer [BUFFER_SIZE] IBSS_ATTR;
static int32_t read_callback (void *buffer, int32_t bytes)
{
int32_t retval = ci->read_filebuf (buffer, bytes);
ci->id3->offset = ci->curpos;
return retval;
}
/* this is the codec entry point */
enum codec_status codec_main(void)
{
WavpackContext *wpc;
char error [80];
int bps, nchans, sr_100;
int retval;
/* Generic codec initialisation */
ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, 1024*128);
ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
next_track:
if (codec_init()) {
retval = CODEC_ERROR;
goto exit;
}
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
codec_set_replaygain(ci->id3);
/* Create a decoder instance */
wpc = WavpackOpenFileInput (read_callback, error);
if (!wpc) {
retval = CODEC_ERROR;
goto done;
}
bps = WavpackGetBytesPerSample (wpc);
nchans = WavpackGetReducedChannels (wpc);
ci->configure(DSP_SET_STEREO_MODE, nchans == 2 ? STEREO_INTERLEAVED : STEREO_MONO);
sr_100 = ci->id3->frequency / 100;
ci->set_elapsed (0);
/* The main decoder loop */
while (1) {
int32_t nsamples;
if (ci->seek_time && ci->taginfo_ready && ci->id3->length) {
ci->seek_time--;
int curpos_ms = WavpackGetSampleIndex (wpc) / sr_100 * 10;
int n, d, skip;
if (ci->seek_time > curpos_ms) {
n = ci->seek_time - curpos_ms;
d = ci->id3->length - curpos_ms;
skip = (int)((int64_t)(ci->filesize - ci->curpos) * n / d);
ci->seek_buffer (ci->curpos + skip);
}
else {
n = curpos_ms - ci->seek_time;
d = curpos_ms;
skip = (int)((int64_t) ci->curpos * n / d);
ci->seek_buffer (ci->curpos - skip);
}
wpc = WavpackOpenFileInput (read_callback, error);
ci->seek_complete();
if (!wpc)
break;
ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
ci->yield ();
}
nsamples = WavpackUnpackSamples (wpc, temp_buffer, BUFFER_SIZE / nchans);
if (!nsamples || ci->stop_codec || ci->new_track)
break;
ci->yield ();
if (ci->stop_codec || ci->new_track)
break;
ci->pcmbuf_insert (temp_buffer, NULL, nsamples);
ci->set_elapsed (WavpackGetSampleIndex (wpc) / sr_100 * 10);
ci->yield ();
}
retval = CODEC_OK;
done:
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
|
