diff options
Diffstat (limited to 'lib/rbcodec/codecs/ay.c')
-rw-r--r-- | lib/rbcodec/codecs/ay.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/ay.c b/lib/rbcodec/codecs/ay.c new file mode 100644 index 0000000000..b11ad84294 --- /dev/null +++ b/lib/rbcodec/codecs/ay.c | |||
@@ -0,0 +1,137 @@ | |||
1 | |||
2 | /* Ripped off from Game_Music_Emu 0.5.2. http://www.slack.net/~ant/ */ | ||
3 | |||
4 | #include <codecs/lib/codeclib.h> | ||
5 | #include "libgme/ay_emu.h" | ||
6 | |||
7 | CODEC_HEADER | ||
8 | |||
9 | /* Maximum number of bytes to process in one iteration */ | ||
10 | #define CHUNK_SIZE (1024*2) | ||
11 | |||
12 | static int16_t samples[CHUNK_SIZE] IBSS_ATTR; | ||
13 | static struct Ay_Emu ay_emu; | ||
14 | |||
15 | /****************** rockbox interface ******************/ | ||
16 | |||
17 | static void set_codec_track(int t, int multitrack) { | ||
18 | Ay_start_track(&ay_emu, t); | ||
19 | |||
20 | /* for loop mode we disable track limits */ | ||
21 | if (!ci->loop_track()) { | ||
22 | Track_set_fade(&ay_emu, Track_get_length( &ay_emu, t ) - 4000, 4000); | ||
23 | } | ||
24 | if (multitrack) ci->set_elapsed(t*1000); /* t is track no to display */ | ||
25 | else ci->set_elapsed(0); | ||
26 | } | ||
27 | |||
28 | /* this is the codec entry point */ | ||
29 | enum codec_status codec_main(enum codec_entry_call_reason reason) | ||
30 | { | ||
31 | if (reason == CODEC_LOAD) { | ||
32 | /* we only render 16 bits */ | ||
33 | ci->configure(DSP_SET_SAMPLE_DEPTH, 16); | ||
34 | |||
35 | /* 44 Khz, Interleaved stereo */ | ||
36 | ci->configure(DSP_SET_FREQUENCY, 44100); | ||
37 | ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED); | ||
38 | |||
39 | Ay_init(&ay_emu); | ||
40 | Ay_set_sample_rate(&ay_emu, 44100); | ||
41 | } | ||
42 | |||
43 | return CODEC_OK; | ||
44 | } | ||
45 | |||
46 | /* this is called for each file to process */ | ||
47 | enum codec_status codec_run(void) | ||
48 | { | ||
49 | blargg_err_t err; | ||
50 | uint8_t *buf; | ||
51 | size_t n; | ||
52 | int track, is_multitrack; | ||
53 | intptr_t param; | ||
54 | uint32_t elapsed_time; | ||
55 | |||
56 | /* reset values */ | ||
57 | track = is_multitrack = 0; | ||
58 | elapsed_time = 0; | ||
59 | |||
60 | DEBUGF("AY: next_track\n"); | ||
61 | if (codec_init()) { | ||
62 | return CODEC_ERROR; | ||
63 | } | ||
64 | |||
65 | codec_set_replaygain(ci->id3); | ||
66 | |||
67 | /* Read the entire file */ | ||
68 | DEBUGF("AY: request file\n"); | ||
69 | ci->seek_buffer(0); | ||
70 | buf = ci->request_buffer(&n, ci->filesize); | ||
71 | if (!buf || n < (size_t)ci->filesize) { | ||
72 | DEBUGF("AY: file load failed\n"); | ||
73 | return CODEC_ERROR; | ||
74 | } | ||
75 | |||
76 | if ((err = Ay_load_mem(&ay_emu, buf, ci->filesize))) { | ||
77 | DEBUGF("AY: Ay_load_mem failed (%s)\n", err); | ||
78 | return CODEC_ERROR; | ||
79 | } | ||
80 | |||
81 | /* Update internal track count */ | ||
82 | if (ay_emu.m3u.size > 0) | ||
83 | ay_emu.track_count = ay_emu.m3u.size; | ||
84 | |||
85 | /* Check if file has multiple tracks */ | ||
86 | if (ay_emu.track_count > 1) { | ||
87 | is_multitrack = 1; | ||
88 | } | ||
89 | |||
90 | next_track: | ||
91 | set_codec_track(track, is_multitrack); | ||
92 | |||
93 | /* The main decoder loop */ | ||
94 | while (1) { | ||
95 | enum codec_command_action action = ci->get_command(¶m); | ||
96 | |||
97 | if (action == CODEC_ACTION_HALT) | ||
98 | break; | ||
99 | |||
100 | if (action == CODEC_ACTION_SEEK_TIME) { | ||
101 | if (is_multitrack) { | ||
102 | track = param/1000; | ||
103 | ci->seek_complete(); | ||
104 | if (track >= ay_emu.track_count) break; | ||
105 | goto next_track; | ||
106 | } | ||
107 | |||
108 | ci->set_elapsed(param); | ||
109 | elapsed_time = param; | ||
110 | Track_seek(&ay_emu, param); | ||
111 | ci->seek_complete(); | ||
112 | |||
113 | /* Set fade again */ | ||
114 | if (!ci->loop_track()) { | ||
115 | Track_set_fade(&ay_emu, Track_get_length( &ay_emu, track ) - 4000, 4000); | ||
116 | } | ||
117 | } | ||
118 | |||
119 | /* Generate audio buffer */ | ||
120 | err = Ay_play(&ay_emu, CHUNK_SIZE, samples); | ||
121 | if (err || Track_ended(&ay_emu)) { | ||
122 | track++; | ||
123 | if (track >= ay_emu.track_count) break; | ||
124 | goto next_track; | ||
125 | } | ||
126 | |||
127 | ci->pcmbuf_insert(samples, NULL, CHUNK_SIZE >> 1); | ||
128 | |||
129 | /* Set elapsed time for one track files */ | ||
130 | if (!is_multitrack) { | ||
131 | elapsed_time += (CHUNK_SIZE / 2) * 10 / 441; | ||
132 | ci->set_elapsed(elapsed_time); | ||
133 | } | ||
134 | } | ||
135 | |||
136 | return CODEC_OK; | ||
137 | } | ||