1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
8 * Copyright (C) 2009 Mohamed Tarek
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
16 * KIND, either express or implied.
18 ****************************************************************************/
25 #include "libcook/cook.h"
27 #define DATA_HEADER_SIZE 18 /* size of DATA chunk header in a rm file */
33 COOKContext q IBSS_ATTR
;
35 static void init_rm(RMContext
*rmctx
)
37 memcpy(rmctx
, (void*)(( (intptr_t)ci
->id3
->id3v2buf
+ 3 ) &~ 3), sizeof(RMContext
));
40 /* this is the codec entry point */
41 enum codec_status
codec_main(void)
43 static size_t buff_size
;
44 int datasize
, res
, consumed
, i
, time_offset
;
46 int16_t outbuf
[2048] __attribute__((aligned(32)));
48 uint32_t packet_count
;
49 int scrambling_unit_size
, num_units
;
53 DEBUGF("codec init failed\n");
56 while (!*ci
->taginfo_ready
&& !ci
->stop_codec
)
59 codec_set_replaygain(ci
->id3
);
60 ci
->memset(&rmctx
,0,sizeof(RMContext
));
61 ci
->memset(&pkt
,0,sizeof(RMPacket
));
62 ci
->memset(&q
,0,sizeof(COOKContext
));
66 ci
->configure(DSP_SET_FREQUENCY
, ci
->id3
->frequency
);
67 ci
->configure(DSP_SET_SAMPLE_DEPTH
, 16);
68 ci
->configure(DSP_SET_STEREO_MODE
, rmctx
.nb_channels
== 1 ?
69 STEREO_MONO
: STEREO_INTERLEAVED
);
71 packet_count
= rmctx
.nb_packets
;
72 rmctx
.audio_framesize
= rmctx
.block_align
;
73 rmctx
.block_align
= rmctx
.sub_packet_size
;
74 fs
= rmctx
.audio_framesize
;
75 sps
= rmctx
.block_align
;
76 h
= rmctx
.sub_packet_h
;
77 scrambling_unit_size
= h
*fs
;
79 res
=cook_decode_init(&rmctx
, &q
);
81 DEBUGF("failed to initialize cook decoder\n");
86 ci
->advance_buffer(rmctx
.data_offset
+ DATA_HEADER_SIZE
);
88 /* The main decoder loop */
92 bit_buffer
= (uint8_t *) ci
->request_buffer(&buff_size
, scrambling_unit_size
);
93 consumed
= rm_get_packet(&bit_buffer
, &rmctx
, &pkt
);
95 DEBUGF("rm_get_packet failed\n");
99 for(i
= 0; i
< rmctx
.audio_pkt_cnt
*(fs
/sps
) ; i
++)
102 if (ci
->stop_codec
|| ci
->new_track
)
106 ci
->set_elapsed(ci
->seek_time
);
108 /* Do not allow seeking beyond the file's length */
109 if ((unsigned) ci
->seek_time
> ci
->id3
->length
) {
114 ci
->seek_buffer(rmctx
.data_offset
+ DATA_HEADER_SIZE
);
115 packet_count
= rmctx
.nb_packets
;
116 rmctx
.audio_pkt_cnt
= 0;
117 rmctx
.frame_number
= 0;
119 /* Seek to the start of the track */
120 if (ci
->seek_time
== 1) {
125 num_units
= ((ci
->seek_time
)/(sps
*1000*8/rmctx
.bit_rate
))/(h
*(fs
/sps
));
126 ci
->seek_buffer(rmctx
.data_offset
+ DATA_HEADER_SIZE
+ consumed
* num_units
);
127 bit_buffer
= (uint8_t *) ci
->request_buffer(&buff_size
, scrambling_unit_size
);
128 consumed
= rm_get_packet(&bit_buffer
, &rmctx
, &pkt
);
130 DEBUGF("rm_get_packet failed\n");
133 packet_count
= rmctx
.nb_packets
- rmctx
.audio_pkt_cnt
* num_units
;
134 rmctx
.frame_number
= ((ci
->seek_time
)/(sps
*1000*8/rmctx
.bit_rate
));
135 while(rmctx
.audiotimestamp
> (unsigned) ci
->seek_time
) {
136 rmctx
.audio_pkt_cnt
= 0;
137 ci
->seek_buffer(rmctx
.data_offset
+ DATA_HEADER_SIZE
+ consumed
* (num_units
-1));
138 bit_buffer
= (uint8_t *) ci
->request_buffer(&buff_size
, scrambling_unit_size
);
139 consumed
= rm_get_packet(&bit_buffer
, &rmctx
, &pkt
);
140 packet_count
+= rmctx
.audio_pkt_cnt
;
143 time_offset
= ci
->seek_time
- rmctx
.audiotimestamp
;
144 i
= (time_offset
/((sps
* 8 * 1000)/rmctx
.bit_rate
));
145 ci
->set_elapsed(rmctx
.audiotimestamp
+(1000*8*sps
/rmctx
.bit_rate
)*i
);
148 res
= cook_decode_frame(&rmctx
,&q
, outbuf
, &datasize
, pkt
.frames
[i
], rmctx
.block_align
);
149 rmctx
.frame_number
++;
151 /* skip the first two frames; no valid audio */
152 if(rmctx
.frame_number
< 3) continue;
154 if(res
!= rmctx
.block_align
) {
155 DEBUGF("codec error\n");
159 ci
->pcmbuf_insert(outbuf
, NULL
, q
.samples_per_frame
/ rmctx
.nb_channels
);
160 ci
->set_elapsed(rmctx
.audiotimestamp
+(1000*8*sps
/rmctx
.bit_rate
)*i
);
162 packet_count
-= rmctx
.audio_pkt_cnt
;
163 rmctx
.audio_pkt_cnt
= 0;
164 ci
->advance_buffer(consumed
);
168 if (ci
->request_next_track())