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1 | /* |
2 | * Buffering handling |
3 | * (C) notaz, 2007,2008 |
4 | * |
5 | * This work is licensed under the terms of MAME license. |
6 | * See COPYING file in the top-level directory. |
7 | */ |
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8 | |
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9 | #include "../pico_int.h" |
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10 | |
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11 | int PicoCDBuffers = 0; |
12 | static unsigned char *cd_buffer = NULL; |
13 | static int prev_lba = 0x80000000; |
14 | |
15 | static int hits, reads; |
16 | |
17 | |
18 | void PicoCDBufferInit(void) |
19 | { |
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20 | void *tmp = NULL; |
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21 | |
22 | prev_lba = 0x80000000; |
23 | hits = reads = 0; |
24 | |
25 | if (PicoCDBuffers <= 1) { |
26 | PicoCDBuffers = 0; |
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27 | return; /* buffering off */ |
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28 | } |
29 | |
30 | /* try alloc'ing until we succeed */ |
31 | while (PicoCDBuffers > 0) |
32 | { |
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33 | tmp = realloc(cd_buffer, PicoCDBuffers * 2048 + 304); |
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34 | if (tmp != NULL) break; |
35 | PicoCDBuffers >>= 1; |
36 | } |
37 | |
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38 | if (PicoCDBuffers <= 0) return; /* buffering became off */ |
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39 | |
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40 | cd_buffer = tmp; |
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41 | } |
42 | |
43 | |
44 | void PicoCDBufferFree(void) |
45 | { |
46 | if (cd_buffer) { |
47 | free(cd_buffer); |
48 | cd_buffer = NULL; |
49 | } |
50 | if (reads) |
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51 | elprintf(EL_STATUS, "CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads); |
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52 | } |
53 | |
54 | |
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55 | void PicoCDBufferFlush(void) |
56 | { |
57 | prev_lba = 0x80000000; |
58 | } |
59 | |
60 | |
61 | /* this is was a try to fight slow SD access of GP2X */ |
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62 | PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba) |
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63 | { |
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64 | int is_bin, offs, read_len, moved = 0; |
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65 | reads++; |
66 | |
67 | is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN; |
68 | |
69 | if (PicoCDBuffers <= 0) |
70 | { |
71 | /* no buffering */ |
72 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
73 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
74 | pm_read(dest, 2048, Pico_mcd->TOC.Tracks[0].F); |
75 | return; |
76 | } |
77 | |
78 | /* hit? */ |
79 | offs = lba - prev_lba; |
80 | if (offs >= 0 && offs < PicoCDBuffers) |
81 | { |
82 | hits++; |
83 | if (offs == 0) dprintf("CD buffer seek to old %i -> %i\n", prev_lba, lba); |
84 | memcpy32(dest, (int *)(cd_buffer + offs*2048), 2048/4); |
85 | return; |
86 | } |
87 | |
88 | if (prev_lba + PicoCDBuffers != lba) |
89 | { |
90 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
91 | dprintf("CD buffer seek %i -> %i\n", prev_lba, lba); |
92 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
93 | } |
94 | |
95 | dprintf("CD buffer miss %i -> %i\n", prev_lba, lba); |
96 | |
97 | if (lba < prev_lba && prev_lba - lba < PicoCDBuffers) |
98 | { |
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99 | read_len = prev_lba - lba; |
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100 | dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len); |
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101 | memmove(cd_buffer + read_len*2048, cd_buffer, (PicoCDBuffers - read_len)*2048); |
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102 | moved = 1; |
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103 | } |
104 | else |
105 | { |
106 | read_len = PicoCDBuffers; |
107 | } |
108 | |
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109 | if (PicoMessage != NULL && read_len >= 512) |
110 | { |
111 | PicoMessage("Buffering data..."); |
112 | } |
113 | |
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114 | if (is_bin) |
115 | { |
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116 | int i = 0; |
117 | #if REDUCE_IO_CALLS |
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118 | int bufs = (read_len*2048) / (2048+304); |
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119 | pm_read(cd_buffer, bufs*(2048+304), Pico_mcd->TOC.Tracks[0].F); |
120 | for (i = 1; i < bufs; i++) |
121 | // should really use memmove here, but my memcpy32 implementation is also suitable here |
122 | memcpy32((int *)(cd_buffer + i*2048), (int *)(cd_buffer + i*(2048+304)), 2048/4); |
123 | #endif |
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124 | for (; i < read_len - 1; i++) |
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125 | { |
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126 | pm_read(cd_buffer + i*2048, 2048 + 304, Pico_mcd->TOC.Tracks[0].F); |
127 | // pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); // seeking is slower, in PSP case even more |
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128 | } |
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129 | // further data might be moved, do not overwrite |
130 | pm_read(cd_buffer + i*2048, 2048, Pico_mcd->TOC.Tracks[0].F); |
131 | pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); |
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132 | } |
133 | else |
134 | { |
135 | pm_read(cd_buffer, read_len*2048, Pico_mcd->TOC.Tracks[0].F); |
136 | } |
137 | memcpy32(dest, (int *) cd_buffer, 2048/4); |
138 | prev_lba = lba; |
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139 | |
140 | if (moved) |
141 | { |
142 | /* file pointer must point to the same data in file, as would-be data after our buffer */ |
143 | int where_seek; |
144 | lba += PicoCDBuffers; |
145 | where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
146 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
147 | } |
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148 | } |
149 | |