cue/bin finally implemented
[picodrive.git] / platform / linux / 940ctl_ym2612.c
CommitLineData
cc68a136 1/* faked 940 code just uses local copy of ym2612 */
2#include <stdio.h>
3#include <stdlib.h>
4#include <string.h>
5#include <unistd.h>
6#include <sys/mman.h>
7#include <sys/ioctl.h>
8#include <fcntl.h>
9#include <errno.h>
10
11#include "../../Pico/sound/ym2612.h"
12#include "../gp2x/gp2x.h"
13#include "../gp2x/emu.h"
14#include "../gp2x/menu.h"
cb0316e4 15#include "../gp2x/code940/940shared.h"
7d4906bf 16#include "../common/helix/pub/mp3dec.h"
cb0316e4 17#include "../../Pico/PicoInt.h"
cc68a136 18
19
20static YM2612 ym2612;
21
22YM2612 *ym2612_940 = &ym2612;
cc68a136 23
51a902ae 24// static _940_data_t shared_data_;
cb0316e4 25static _940_ctl_t shared_ctl_;
51a902ae 26// static _940_data_t *shared_data = &shared_data_;
e11c5548 27_940_ctl_t *shared_ctl = &shared_ctl_;
cb0316e4 28
29unsigned char *mp3_mem = 0;
30
31#define MP3_SIZE_MAX (0x1000000 - 4*640*480)
cc68a136 32
33/***********************************************************/
34
cc68a136 35
36int YM2612Write_940(unsigned int a, unsigned int v)
37{
38 YM2612Write_(a, v);
39
40 return 0; // cause the engine to do updates once per frame only
41}
42
cc68a136 43
44void YM2612PicoStateLoad_940(void)
45{
46 int i;
47
48 YM2612PicoStateLoad_();
49
50 for(i = 0; i < 0x100; i++) {
51 YM2612Write_(0, i);
52 YM2612Write_(1, ym2612.REGS[i]);
53 }
54 for(i = 0; i < 0x100; i++) {
55 YM2612Write_(2, i);
56 YM2612Write_(3, ym2612.REGS[i|0x100]);
57 }
58}
59
60
e11c5548 61void sharedmem_init(void)
cc68a136 62{
cb0316e4 63 mp3_mem = malloc(MP3_SIZE_MAX);
e11c5548 64}
65
66void sharedmem_deinit(void)
67{
68 free(mp3_mem);
69}
cb0316e4 70
e11c5548 71void YM2612Init_940(int baseclock, int rate)
72{
cc68a136 73 YM2612Init_(baseclock, rate);
74}
75
76
77void YM2612ResetChip_940(void)
78{
79 YM2612ResetChip_();
80}
81
82
cb0316e4 83#if 0
84static void local_decode(void)
85{
86 int mp3_offs = shared_ctl->mp3_offs;
87 unsigned char *readPtr = mp3_mem + mp3_offs;
88 int bytesLeft = shared_ctl->mp3_len - mp3_offs;
89 int offset; // frame offset from readPtr
90 int err = 0;
91
92 if (bytesLeft <= 0) return; // EOF, nothing to do
93
94 offset = MP3FindSyncWord(readPtr, bytesLeft);
95 if (offset < 0) {
96 shared_ctl->mp3_offs = shared_ctl->mp3_len;
97 return; // EOF
98 }
99 readPtr += offset;
100 bytesLeft -= offset;
101
102 err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
103 shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
104 if (err) {
105 if (err == ERR_MP3_INDATA_UNDERFLOW) {
106 shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF
107 return;
108 } else if (err <= -6 && err >= -12) {
109 // ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
110 // just try to skip the offending frame..
111 readPtr++;
112 }
113 shared_ctl->mp3_errors++;
114 shared_ctl->mp3_lasterr = err;
115 }
116 shared_ctl->mp3_offs = readPtr - mp3_mem;
117}
118#endif
119
120
121
122
123static FILE *loaded_mp3 = 0;
124
4f265db7 125int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)
cc68a136 126{
cb0316e4 127#if 0
128 int cdda_on, *ym_buffer = mix_buffer;
129 static int mp3_samples_ready = 0, mp3_buffer_offs = 0;
130 static int mp3_play_bufsel = 1;
131
132
133 YM2612UpdateOne_(buffer, length, stereo); // really writes to mix_buffer
cc68a136 134
cb0316e4 135 // emulatind MCD, not data track, CDC is reading, playback was started, track not ended
136 cdda_on = (PicoMCD & 1) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1)
137 && loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;
138
139 /* mix data from previous go */
140 if (cdda_on && mp3_samples_ready >= length)
141 {
142 if (1152 - mp3_buffer_offs >= length) {
143 mix_samples(buffer, ym_buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length, stereo);
144
145 mp3_buffer_offs += length;
146 } else {
147 // collect from both buffers..
148 int left = 1152 - mp3_buffer_offs;
149 mix_samples(buffer, ym_buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, left, stereo);
150 mp3_play_bufsel ^= 1;
151 mp3_buffer_offs = length - left;
152 mix_samples(buffer + left * 2, ym_buffer + left * 2,
153 shared_data->mp3_buffer[mp3_play_bufsel], mp3_buffer_offs, stereo);
cc68a136 154 }
cb0316e4 155 mp3_samples_ready -= length;
cc68a136 156 } else {
cb0316e4 157 mix_samples(buffer, ym_buffer, 0, length, stereo);
158 }
159
160 // make sure we will have enough mp3 samples next frame
161 if (cdda_on && mp3_samples_ready < length)
162 {
163 shared_ctl->mp3_buffsel ^= 1;
164 local_decode();
165 mp3_samples_ready += 1152;
166 }
167#else
4f265db7 168 return YM2612UpdateOne_(buffer, length, stereo, is_buf_empty);
cb0316e4 169#endif
170}
171
172
e11c5548 173void mp3_update(int *buffer, int length, int stereo)
174{
175 // nothing..
176}
177
178
cb0316e4 179/***********************************************************/
180
181void mp3_start_play(FILE *f, int pos) // pos is 0-1023
182{
183 int byte_offs = 0;
184
185 if (loaded_mp3 != f)
186 {
187 printf("loading mp3... "); fflush(stdout);
188 fseek(f, 0, SEEK_SET);
189 fread(mp3_mem, 1, MP3_SIZE_MAX, f);
190 if (feof(f)) printf("done.\n");
191 else printf("done. mp3 too large, not all data loaded.\n");
192 shared_ctl->mp3_len = ftell(f);
193 loaded_mp3 = f;
cc68a136 194 }
cb0316e4 195
196 // seek..
197 if (pos) {
198 byte_offs = (shared_ctl->mp3_len << 6) >> 10;
199 byte_offs *= pos;
200 byte_offs >>= 6;
201 }
202 printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);
203
204 shared_ctl->mp3_offs = byte_offs;
cc68a136 205}
206
cb0316e4 207