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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Thom Johansen
*
* 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 <codecs/libmusepack/musepack.h>
mpc_decoder decoder;
/* Our implementations of the mpc_reader callback functions. */
mpc_int32_t read_impl(void *data, void *ptr, mpc_int32_t size)
{
struct codec_api *ci = (struct codec_api *)data;
return ((mpc_int32_t)(ci->read_filebuf(ptr, size)));
}
bool seek_impl(void *data, mpc_int32_t offset)
{
struct codec_api *ci = (struct codec_api *)data;
/* WARNING: assumes we don't need to skip too far into the past,
this might not be supported by the buffering layer yet */
return ci->seek_buffer(offset);
}
mpc_int32_t tell_impl(void *data)
{
struct codec_api *ci = (struct codec_api *)data;
return ci->curpos;
}
mpc_int32_t get_size_impl(void *data)
{
struct codec_api *ci = (struct codec_api *)data;
return ci->filesize;
}
bool canseek_impl(void *data)
{
(void)data;
/* doesn't much matter, libmusepack ignores this anyway */
return true;
}
/* temporary, we probably have better use for iram than this */
MPC_SAMPLE_FORMAT sample_buffer[MPC_DECODER_BUFFER_LENGTH] IBSS_ATTR;
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api *api)
{
struct codec_api *ci = api;
mpc_int64_t samplesdone;
unsigned long frequency;
unsigned status;
mpc_reader reader;
mpc_streaminfo info;
TEST_CODEC_API(api);
#ifdef USE_IRAM
ci->memcpy(iramstart, iramcopy, iramend - iramstart);
#endif
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(DSP_SET_SAMPLE_DEPTH, (long *)(MPC_FIXED_POINT_SCALE_SHIFT));
ci->configure(DSP_SET_CLIP_MAX, (long *)MPC_FIXED_POINT_SCALE);
ci->configure(DSP_SET_CLIP_MIN, (long *)-MPC_FIXED_POINT_SCALE);
ci->configure(CODEC_SET_FILEBUF_LIMIT, (long *)(1024*1024*2));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (long *)(1024*16));
/* Create a decoder instance */
reader.read = read_impl;
reader.seek = seek_impl;
reader.tell = tell_impl;
reader.get_size = get_size_impl;
reader.canseek = canseek_impl;
reader.data = ci;
next_track:
if (codec_init(api))
return CODEC_ERROR;
/* read file's streaminfo data */
mpc_streaminfo_init(&info);
if (mpc_streaminfo_read(&info, &reader) != ERROR_CODE_OK)
return CODEC_ERROR;
frequency = info.sample_freq;
ci->configure(DSP_SET_FREQUENCY, (long *)info.sample_freq);
/* TODO: this should no doubt be handled in metadata.c */
ci->id3->length = info.pcm_samples/info.sample_freq*1000;
/* set playback engine up for correct number of channels */
/* NOTE: current musepack format only allows for stereo files
but code is here to handle other configurations anyway */
if (info.channels == 2)
ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_INTERLEAVED);
else if (info.channels == 1)
ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_MONO);
else
return CODEC_ERROR;
/* instantiate a decoder with our file reader */
mpc_decoder_setup(&decoder, &reader);
if (!mpc_decoder_initialize(&decoder, &info))
return CODEC_ERROR;
/* This is the decoding loop. */
samplesdone = 0;
do {
if (ci->seek_time) {
mpc_int64_t new_sample_offset = ci->seek_time*info.sample_freq/1000;
if (mpc_decoder_seek_sample(&decoder, new_sample_offset)) {
samplesdone = new_sample_offset;
ci->set_elapsed(ci->seek_time);
}
ci->seek_complete();
}
if (ci->stop_codec || ci->reload_codec)
break;
status = mpc_decoder_decode(&decoder, sample_buffer, 0, 0);
ci->yield();
if (status == (unsigned)(-1)) { /* decode error */
return CODEC_ERROR;
} else {
while (!ci->pcmbuf_insert((char *)sample_buffer,
status*sizeof(MPC_SAMPLE_FORMAT)*2))
ci->yield();
samplesdone += status;
ci->set_elapsed(samplesdone/(frequency/1000));
}
} while (status != 0) ;
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
|
