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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libgme/sgc_emu.h | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libgme/sgc_emu.h')
-rw-r--r-- | lib/rbcodec/codecs/libgme/sgc_emu.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libgme/sgc_emu.h b/lib/rbcodec/codecs/libgme/sgc_emu.h new file mode 100644 index 0000000000..83cde1e6ae --- /dev/null +++ b/lib/rbcodec/codecs/libgme/sgc_emu.h | |||
@@ -0,0 +1,195 @@ | |||
1 | // Sega/Game Gear/Coleco SGC music file emulator | ||
2 | |||
3 | // Game_Music_Emu 0.6-pre | ||
4 | #ifndef SGC_EMU_H | ||
5 | #define SGC_EMU_H | ||
6 | |||
7 | #include "blargg_common.h" | ||
8 | #include "multi_buffer.h" | ||
9 | |||
10 | #include "rom_data.h" | ||
11 | #include "z80_cpu.h" | ||
12 | #include "sms_fm_apu.h" | ||
13 | #include "sms_apu.h" | ||
14 | #include "m3u_playlist.h" | ||
15 | #include "track_filter.h" | ||
16 | |||
17 | typedef struct Z80_Cpu Sgc_Cpu; | ||
18 | |||
19 | // SGC file header | ||
20 | enum { header_size = 0xA0 }; | ||
21 | struct header_t | ||
22 | { | ||
23 | char tag [4]; // "SGC\x1A" | ||
24 | byte vers; // 0x01 | ||
25 | byte rate; // 0=NTSC 1=PAL | ||
26 | byte reserved1 [2]; | ||
27 | byte load_addr [2]; | ||
28 | byte init_addr [2]; | ||
29 | byte play_addr [2]; | ||
30 | byte stack_ptr [2]; | ||
31 | byte reserved2 [2]; | ||
32 | byte rst_addrs [7*2]; | ||
33 | byte mapping [4]; // Used by Sega only | ||
34 | byte first_song; // Song to start playing first | ||
35 | byte song_count; | ||
36 | byte first_effect; | ||
37 | byte last_effect; | ||
38 | byte system; // 0=Master System 1=Game Gear 2=Colecovision | ||
39 | byte reserved3 [23]; | ||
40 | char game [32]; // strings can be 32 chars, NOT terminated | ||
41 | char author [32]; | ||
42 | char copyright [32]; | ||
43 | }; | ||
44 | |||
45 | // True if header has valid file signature | ||
46 | static inline bool valid_tag( struct header_t* h ) | ||
47 | { | ||
48 | return 0 == memcmp( h->tag, "SGC\x1A", 4 ); | ||
49 | } | ||
50 | |||
51 | static inline int effect_count( struct header_t* h ) { return h->last_effect ? h->last_effect - h->first_effect + 1 : 0; } | ||
52 | |||
53 | struct Sgc_Emu { | ||
54 | bool fm_accessed; | ||
55 | |||
56 | cpu_time_t play_period; | ||
57 | cpu_time_t next_play; | ||
58 | void const* bank2; // ROM selected for bank 2, in case RAM is currently hiding it | ||
59 | addr_t vectors_addr; // RST vectors start here | ||
60 | addr_t idle_addr; // return address for init/play routines | ||
61 | void* coleco_bios; | ||
62 | |||
63 | // general | ||
64 | int voice_count; | ||
65 | int const* voice_types; | ||
66 | int mute_mask_; | ||
67 | int tempo; | ||
68 | int gain; | ||
69 | |||
70 | int sample_rate; | ||
71 | |||
72 | // track-specific | ||
73 | int current_track; | ||
74 | int track_count; | ||
75 | |||
76 | int clock_rate_; | ||
77 | unsigned buf_changed_count; | ||
78 | |||
79 | // M3u Playlist | ||
80 | struct M3u_Playlist m3u; | ||
81 | struct header_t header; | ||
82 | |||
83 | struct setup_t tfilter; | ||
84 | struct Track_Filter track_filter; | ||
85 | |||
86 | struct Multi_Buffer stereo_buf; | ||
87 | |||
88 | struct Sms_Apu apu; | ||
89 | struct Sms_Fm_Apu fm_apu; | ||
90 | |||
91 | Sgc_Cpu cpu; | ||
92 | |||
93 | // large items | ||
94 | struct Rom_Data rom; | ||
95 | byte vectors [page_size + page_padding]; | ||
96 | byte unmapped_write [0x4000]; | ||
97 | byte ram [0x2000 + page_padding]; | ||
98 | byte ram2 [0x4000 + page_padding]; | ||
99 | }; | ||
100 | |||
101 | // Basic functionality (see Gme_File.h for file loading/track info functions) | ||
102 | |||
103 | void Sgc_init( struct Sgc_Emu* this ); | ||
104 | |||
105 | blargg_err_t Sgc_load_mem( struct Sgc_Emu* this, const void* data, long size ); | ||
106 | |||
107 | static inline int clock_rate( struct Sgc_Emu* this ) { return this->header.rate ? 3546893 : 3579545; } | ||
108 | |||
109 | // 0x2000 bytes | ||
110 | static inline void set_coleco_bios( struct Sgc_Emu* this, void* p ) { this->coleco_bios = p; } | ||
111 | |||
112 | // Set output sample rate. Must be called only once before loading file. | ||
113 | blargg_err_t Sgc_set_sample_rate( struct Sgc_Emu* this, int sample_rate ); | ||
114 | |||
115 | // Start a track, where 0 is the first track. Also clears warning string. | ||
116 | blargg_err_t Sgc_start_track( struct Sgc_Emu* this, int track ); | ||
117 | |||
118 | // Generate 'count' samples info 'buf'. Output is in stereo. Any emulation | ||
119 | // errors set warning string, and major errors also end track. | ||
120 | blargg_err_t Sgc_play( struct Sgc_Emu* this, int count, sample_t* buf ); | ||
121 | |||
122 | // Track status/control | ||
123 | |||
124 | // Number of milliseconds (1000 msec = 1 second) played since beginning of track | ||
125 | int Track_tell( struct Sgc_Emu* this ); | ||
126 | |||
127 | // Seek to new time in track. Seeking backwards or far forward can take a while. | ||
128 | blargg_err_t Track_seek( struct Sgc_Emu* this, int msec ); | ||
129 | |||
130 | // Skip n samples | ||
131 | blargg_err_t Track_skip( struct Sgc_Emu* this, int n ); | ||
132 | |||
133 | // Set start time and length of track fade out. Once fade ends track_ended() returns | ||
134 | // true. Fade time can be changed while track is playing. | ||
135 | void Track_set_fade( struct Sgc_Emu* this, int start_msec, int length_msec ); | ||
136 | |||
137 | // True if a track has reached its end | ||
138 | static inline bool Track_ended( struct Sgc_Emu* this ) | ||
139 | { | ||
140 | return track_ended( &this->track_filter ); | ||
141 | } | ||
142 | |||
143 | // Disables automatic end-of-track detection and skipping of silence at beginning | ||
144 | static inline void Track_ignore_silence( struct Sgc_Emu* this, bool disable ) | ||
145 | { | ||
146 | this->track_filter.silence_ignored_ = disable; | ||
147 | } | ||
148 | |||
149 | // Get track length in milliseconds | ||
150 | static inline int Track_get_length( struct Sgc_Emu* this, int n ) | ||
151 | { | ||
152 | int length = 120 * 1000; /* 2 minutes */ | ||
153 | if ( (this->m3u.size > 0) && (n < this->m3u.size) ) { | ||
154 | struct entry_t* entry = &this->m3u.entries [n]; | ||
155 | length = entry->length; | ||
156 | } | ||
157 | |||
158 | return length; | ||
159 | } | ||
160 | |||
161 | // Sound customization | ||
162 | |||
163 | // Adjust song tempo, where 1.0 = normal, 0.5 = half speed, 2.0 = double speed. | ||
164 | // Track length as returned by track_info() assumes a tempo of 1.0. | ||
165 | void Sound_set_tempo( struct Sgc_Emu* this, int t ); | ||
166 | |||
167 | // Mute/unmute voice i, where voice 0 is first voice | ||
168 | void Sound_mute_voice( struct Sgc_Emu* this, int index, bool mute ); | ||
169 | |||
170 | // Set muting state of all voices at once using a bit mask, where -1 mutes them all, | ||
171 | // 0 unmutes them all, 0x01 mutes just the first voice, etc. | ||
172 | void Sound_mute_voices( struct Sgc_Emu* this, int mask ); | ||
173 | |||
174 | // Change overall output amplitude, where 1.0 results in minimal clamping. | ||
175 | // Must be called before set_sample_rate(). | ||
176 | static inline void Sound_set_gain( struct Sgc_Emu* this, int g ) | ||
177 | { | ||
178 | assert( !this->sample_rate ); // you must set gain before setting sample rate | ||
179 | this->gain = g; | ||
180 | } | ||
181 | |||
182 | // True if Master System or Game Gear | ||
183 | static inline bool sega_mapping( struct Sgc_Emu* this ) | ||
184 | { | ||
185 | return this->header.system <= 1; | ||
186 | } | ||
187 | |||
188 | // Emulation (You shouldn't touch these) | ||
189 | |||
190 | bool run_cpu( struct Sgc_Emu* this, cpu_time_t end_time ); | ||
191 | void cpu_out( struct Sgc_Emu* this, cpu_time_t time, addr_t addr, int data ); | ||
192 | void cpu_write( struct Sgc_Emu* this, addr_t addr, int data ); | ||
193 | void jsr( struct Sgc_Emu* this, byte addr [2] ); | ||
194 | |||
195 | #endif | ||