diff options
Diffstat (limited to 'lib/rbcodec/codecs/nsf.c')
-rw-r--r-- | lib/rbcodec/codecs/nsf.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/nsf.c b/lib/rbcodec/codecs/nsf.c new file mode 100644 index 0000000000..4c5b37c3fa --- /dev/null +++ b/lib/rbcodec/codecs/nsf.c | |||
@@ -0,0 +1,135 @@ | |||
1 | |||
2 | /* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */ | ||
3 | |||
4 | #define GME_NSF_TYPE | ||
5 | |||
6 | #include <codecs/lib/codeclib.h> | ||
7 | #include "libgme/nsf_emu.h" | ||
8 | |||
9 | CODEC_HEADER | ||
10 | |||
11 | /* Maximum number of bytes to process in one iteration */ | ||
12 | #define CHUNK_SIZE (1024*2) | ||
13 | |||
14 | static int16_t samples[CHUNK_SIZE] IBSS_ATTR; | ||
15 | static struct Nsf_Emu nsf_emu; | ||
16 | |||
17 | /****************** rockbox interface ******************/ | ||
18 | |||
19 | static void set_codec_track(int t, int multitrack) { | ||
20 | Nsf_start_track(&nsf_emu, t); | ||
21 | |||
22 | /* for REPEAT_ONE we disable track limits */ | ||
23 | if (!ci->loop_track()) { | ||
24 | Track_set_fade(&nsf_emu, Track_length( &nsf_emu, t ) - 4000, 4000); | ||
25 | } | ||
26 | if (multitrack) ci->set_elapsed(t*1000); /* t is track no to display */ | ||
27 | else ci->set_elapsed(0); | ||
28 | } | ||
29 | |||
30 | /* this is the codec entry point */ | ||
31 | enum codec_status codec_main(enum codec_entry_call_reason reason) | ||
32 | { | ||
33 | if (reason == CODEC_LOAD) { | ||
34 | /* we only render 16 bits */ | ||
35 | ci->configure(DSP_SET_SAMPLE_DEPTH, 16); | ||
36 | |||
37 | /* 44 Khz, Interleaved stereo */ | ||
38 | ci->configure(DSP_SET_FREQUENCY, 44100); | ||
39 | ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED); | ||
40 | |||
41 | Nsf_init(&nsf_emu); | ||
42 | Nsf_set_sample_rate(&nsf_emu, 44100); | ||
43 | } | ||
44 | |||
45 | return CODEC_OK; | ||
46 | } | ||
47 | |||
48 | /* this is called for each file to process */ | ||
49 | enum codec_status codec_run(void) | ||
50 | { | ||
51 | blargg_err_t err; | ||
52 | uint8_t *buf; | ||
53 | size_t n; | ||
54 | int track, is_multitrack; | ||
55 | uint32_t elapsed_time; | ||
56 | intptr_t param; | ||
57 | |||
58 | track = is_multitrack = 0; | ||
59 | elapsed_time = 0; | ||
60 | |||
61 | DEBUGF("NSF: next_track\n"); | ||
62 | if (codec_init()) { | ||
63 | return CODEC_ERROR; | ||
64 | } | ||
65 | |||
66 | codec_set_replaygain(ci->id3); | ||
67 | |||
68 | /* Read the entire file */ | ||
69 | DEBUGF("NSF: request file\n"); | ||
70 | ci->seek_buffer(0); | ||
71 | buf = ci->request_buffer(&n, ci->filesize); | ||
72 | if (!buf || n < (size_t)ci->filesize) { | ||
73 | DEBUGF("NSF: file load failed\n"); | ||
74 | return CODEC_ERROR; | ||
75 | } | ||
76 | |||
77 | if ((err = Nsf_load_mem(&nsf_emu, buf, ci->filesize))) { | ||
78 | DEBUGF("NSF: Nsf_load_mem failed (%s)\n", err); | ||
79 | return CODEC_ERROR; | ||
80 | } | ||
81 | |||
82 | /* Update internal track count */ | ||
83 | if (nsf_emu.m3u.size > 0) | ||
84 | nsf_emu.track_count = nsf_emu.m3u.size; | ||
85 | |||
86 | if (nsf_emu.track_count > 1) is_multitrack = 1; | ||
87 | |||
88 | next_track: | ||
89 | set_codec_track(track, is_multitrack); | ||
90 | |||
91 | /* The main decoder loop */ | ||
92 | while (1) { | ||
93 | enum codec_command_action action = ci->get_command(¶m); | ||
94 | |||
95 | if (action == CODEC_ACTION_HALT) | ||
96 | break; | ||
97 | |||
98 | if (action == CODEC_ACTION_SEEK_TIME) { | ||
99 | if (is_multitrack) { | ||
100 | track = param/1000; | ||
101 | ci->seek_complete(); | ||
102 | if (track >= nsf_emu.track_count) break; | ||
103 | goto next_track; | ||
104 | } | ||
105 | |||
106 | ci->set_elapsed(param); | ||
107 | elapsed_time = param; | ||
108 | Track_seek(&nsf_emu, param); | ||
109 | ci->seek_complete(); | ||
110 | |||
111 | /* Set fade again */ | ||
112 | if (!ci->loop_track()) { | ||
113 | Track_set_fade(&nsf_emu, Track_length( &nsf_emu, track ), 4000); | ||
114 | } | ||
115 | } | ||
116 | |||
117 | /* Generate audio buffer */ | ||
118 | err = Nsf_play(&nsf_emu, CHUNK_SIZE, samples); | ||
119 | if (err || Track_ended(&nsf_emu)) { | ||
120 | track++; | ||
121 | if (track >= nsf_emu.track_count) break; | ||
122 | goto next_track; | ||
123 | } | ||
124 | |||
125 | ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1); | ||
126 | |||
127 | /* Set elapsed time for one track files */ | ||
128 | if (is_multitrack == 0) { | ||
129 | elapsed_time += (CHUNK_SIZE / 2) * 10 / 441; | ||
130 | ci->set_elapsed(elapsed_time); | ||
131 | } | ||
132 | } | ||
133 | |||
134 | return CODEC_OK; | ||
135 | } | ||