1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2010 Yoshihisa Uchida
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
23 #include "codecs/libpcm/support_formats.h"
27 /* vox codec (Dialogic telephony file formats) */
29 #define PCM_SAMPLE_SIZE (2048)
31 static int32_t samples
[PCM_SAMPLE_SIZE
] IBSS_ATTR
;
33 static struct pcm_format format
;
34 static uint32_t bytesdone
;
36 static uint8_t *read_buffer(size_t *realsize
)
38 uint8_t *buffer
= (uint8_t *)ci
->request_buffer(realsize
, format
.chunksize
);
39 if (bytesdone
+ (*realsize
) > format
.numbytes
)
40 *realsize
= format
.numbytes
- bytesdone
;
41 bytesdone
+= *realsize
;
42 ci
->advance_buffer(*realsize
);
46 /* this is the codec entry point */
47 enum codec_status
codec_main(void)
49 int status
= CODEC_OK
;
50 uint32_t decodedsamples
;
55 off_t firstblockposn
; /* position of the first block in file */
56 const struct pcm_codec
*codec
;
59 /* Generic codec initialisation */
60 ci
->configure(DSP_SET_SAMPLE_DEPTH
, 28);
64 DEBUGF("codec_init() error\n");
69 while (!*ci
->taginfo_ready
&& !ci
->stop_codec
)
72 codec_set_replaygain(ci
->id3
);
74 ci
->memset(&format
, 0, sizeof(struct pcm_format
));
78 format
.bitspersample
= 4;
79 format
.numbytes
= ci
->id3
->filesize
;
80 format
.blockalign
= 1;
82 /* advance to first WAVE chunk */
83 ci
->advance_buffer(offset
);
85 firstblockposn
= offset
;
92 * supports dialogic oki adpcm only
94 codec
= get_dialogic_oki_adpcm_codec();
97 DEBUGF("CODEC_ERROR: dialogic oki adpcm codec does not load.\n");
102 if (!codec
->set_format(&format
))
104 status
= CODEC_ERROR
;
108 if (format
.numbytes
== 0) {
109 DEBUGF("CODEC_ERROR: data size is 0\n");
110 status
= CODEC_ERROR
;
114 /* check chunksize */
115 if (format
.chunksize
* 2 > PCM_SAMPLE_SIZE
)
116 format
.chunksize
= PCM_SAMPLE_SIZE
/ 2;
117 if (format
.chunksize
== 0)
119 DEBUGF("CODEC_ERROR: chunksize is 0\n");
120 status
= CODEC_ERROR
;
124 ci
->configure(DSP_SWITCH_FREQUENCY
, ci
->id3
->frequency
);
125 ci
->configure(DSP_SET_STEREO_MODE
, STEREO_MONO
);
127 /* The main decoder loop */
130 while (!endofstream
) {
132 if (ci
->stop_codec
|| ci
->new_track
) {
137 struct pcm_pos
*newpos
= codec
->get_seek_pos(ci
->seek_time
, &read_buffer
);
139 decodedsamples
= newpos
->samples
;
140 if (newpos
->pos
> format
.numbytes
)
142 if (ci
->seek_buffer(firstblockposn
+ newpos
->pos
))
144 bytesdone
= newpos
->pos
;
149 voxbuf
= (uint8_t *)ci
->request_buffer(&n
, format
.chunksize
);
151 break; /* End of stream */
152 if (bytesdone
+ n
> format
.numbytes
) {
153 n
= format
.numbytes
- bytesdone
;
157 status
= codec
->decode(voxbuf
, n
, samples
, &bufcount
);
158 if (status
== CODEC_ERROR
)
160 DEBUGF("codec error\n");
164 ci
->pcmbuf_insert(samples
, NULL
, bufcount
);
165 ci
->advance_buffer(n
);
167 decodedsamples
+= bufcount
;
169 if (bytesdone
>= format
.numbytes
)
171 ci
->set_elapsed(decodedsamples
*1000LL/ci
->id3
->frequency
);
176 if (ci
->request_next_track())