2 /* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */
3 /* Inflate code taken from WikiViewer plugin by Adam Gashlin */
5 #include <codecs/lib/codeclib.h>
7 #include "libgme/blargg_endian.h"
8 #include "libgme/vgm_emu.h"
9 #include "libgme/inflate/mallocer.h"
10 #include "libgme/inflate/inflate.h"
14 /* Maximum number of bytes to process in one iteration */
15 #define CHUNK_SIZE (1024*4)
18 static int16_t samples
[CHUNK_SIZE
] IBSS_ATTR
;
19 static struct Vgm_Emu vgm_emu
;
21 static void *inflatebuf
; /* heap for gunzip */
22 static char *songbuf
; /* destination for uncompressed song */
23 static uint32_t songbuflen
=0; /* size of the song buffer */
24 static uint32_t songlen
=0; /* used size of the song buffer */
26 /****************** rockbox interface ******************/
28 /* this is the codec entry point */
29 enum codec_status
codec_main(enum codec_entry_call_reason reason
)
31 if (reason
== CODEC_LOAD
) {
32 /* we only render 16 bits */
33 ci
->configure(DSP_SET_SAMPLE_DEPTH
, 16);
35 /* 32 Khz, Interleaved stereo */
36 ci
->configure(DSP_SET_FREQUENCY
, 44100);
37 ci
->configure(DSP_SET_STEREO_MODE
, STEREO_INTERLEAVED
);
40 Vgm_set_sample_rate(&vgm_emu
, 44100);
46 /* this is called for each file to process */
47 enum codec_status
codec_run(void)
54 uint32_t elapsed_time
= 0;
56 DEBUGF("VGM: next_track\n");
61 codec_set_replaygain(ci
->id3
);
63 /* Read the entire file */
64 DEBUGF("VGM: request file\n");
66 buf
= ci
->request_buffer(&n
, ci
->filesize
);
68 DEBUGF("VGM: file load failed\n");
72 /* If couldn't get the whole buffer
73 will trim file and put and 'end_command'
75 if (n
< (size_t)ci
->filesize
) {
76 DEBUGF("VGM: file was trimmed\n");
79 /* If is gzipped decompress it */
80 if ( get_le16( buf
) == 0x8b1f ) {
81 wpw_init_mempool(MAINMEMBUF
);
82 inflatebuf
=wpw_malloc(MAINMEMBUF
,0x13500);
84 /* Will use available remaining memory
86 songbuflen
=wpw_available(MAINMEMBUF
);
87 songbuf
=wpw_malloc(MAINMEMBUF
,songbuflen
);
89 songlen
=decompress(buf
,n
,songbuf
,songbuflen
,0,inflatebuf
);
91 if ((err
= Vgm_load_mem(&vgm_emu
, songbuf
, songlen
, true))) {
92 DEBUGF("VGM: Vgm_load_mem failed (%s)\n", err
);
96 /* Since metadata parser doesn't support VGZ
97 will set song length here */
98 ci
->id3
->length
= Track_get_length( &vgm_emu
);
100 else if ((err
= Vgm_load_mem(&vgm_emu
, buf
, n
, false))) {
101 DEBUGF("VGM: Vgm_load failed_mem (%s)\n", err
);
105 Vgm_start_track(&vgm_emu
);
107 /* for REPEAT_ONE we disable track limits */
108 if (ci
->global_settings
->repeat_mode
!= REPEAT_ONE
) {
109 Track_set_fade(&vgm_emu
, ci
->id3
->length
- 4000, 4000);
114 /* The main decoder loop */
116 enum codec_command_action action
= ci
->get_command(¶m
);
118 if (action
== CODEC_ACTION_HALT
)
121 if (action
== CODEC_ACTION_SEEK_TIME
) {
122 ci
->set_elapsed(param
);
123 elapsed_time
= param
;
124 Track_seek(&vgm_emu
, param
);
127 /* Set fade again in case we seek to start of song */
128 Track_set_fade(&vgm_emu
, ci
->id3
->length
- 4000, 4000);
131 /* Generate audio buffer */
132 err
= Vgm_play(&vgm_emu
, CHUNK_SIZE
, samples
);
133 if (err
|| vgm_emu
.track_ended
) break;
135 ci
->pcmbuf_insert(samples
, NULL
, CHUNK_SIZE
>> 1);
137 elapsed_time
+= (CHUNK_SIZE
/ 2) / 44.1;
138 ci
->set_elapsed(elapsed_time
);