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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 | #include "../cd/cue.h" |
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11 | |
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12 | int PicoCDBuffers = 0; |
13 | static unsigned char *cd_buffer = NULL; |
14 | static int prev_lba = 0x80000000; |
15 | |
16 | static int hits, reads; |
17 | |
9c9cda8c |
18 | #undef dprintf |
19 | #define dprintf(...) |
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20 | |
21 | void PicoCDBufferInit(void) |
22 | { |
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23 | void *tmp = NULL; |
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24 | |
25 | prev_lba = 0x80000000; |
26 | hits = reads = 0; |
27 | |
28 | if (PicoCDBuffers <= 1) { |
29 | PicoCDBuffers = 0; |
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30 | return; /* buffering off */ |
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31 | } |
32 | |
33 | /* try alloc'ing until we succeed */ |
34 | while (PicoCDBuffers > 0) |
35 | { |
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36 | tmp = realloc(cd_buffer, PicoCDBuffers * 2048 + 304); |
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37 | if (tmp != NULL) break; |
38 | PicoCDBuffers >>= 1; |
39 | } |
40 | |
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41 | if (PicoCDBuffers <= 0) return; /* buffering became off */ |
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42 | |
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43 | cd_buffer = tmp; |
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44 | } |
45 | |
46 | |
47 | void PicoCDBufferFree(void) |
48 | { |
49 | if (cd_buffer) { |
50 | free(cd_buffer); |
51 | cd_buffer = NULL; |
52 | } |
53 | if (reads) |
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54 | elprintf(EL_STATUS, "CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads); |
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55 | } |
56 | |
57 | |
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58 | void PicoCDBufferFlush(void) |
59 | { |
60 | prev_lba = 0x80000000; |
61 | } |
62 | |
63 | |
64 | /* this is was a try to fight slow SD access of GP2X */ |
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65 | PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba) |
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66 | { |
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67 | int is_bin, offs, read_len, moved = 0; |
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68 | reads++; |
69 | |
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70 | is_bin = Pico_mcd->TOC.Tracks[0].ftype == CT_BIN; |
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71 | |
72 | if (PicoCDBuffers <= 0) |
73 | { |
74 | /* no buffering */ |
75 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
76 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
77 | pm_read(dest, 2048, Pico_mcd->TOC.Tracks[0].F); |
78 | return; |
79 | } |
80 | |
81 | /* hit? */ |
82 | offs = lba - prev_lba; |
83 | if (offs >= 0 && offs < PicoCDBuffers) |
84 | { |
85 | hits++; |
86 | if (offs == 0) dprintf("CD buffer seek to old %i -> %i\n", prev_lba, lba); |
87 | memcpy32(dest, (int *)(cd_buffer + offs*2048), 2048/4); |
88 | return; |
89 | } |
90 | |
91 | if (prev_lba + PicoCDBuffers != lba) |
92 | { |
93 | int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
94 | dprintf("CD buffer seek %i -> %i\n", prev_lba, lba); |
95 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
96 | } |
97 | |
98 | dprintf("CD buffer miss %i -> %i\n", prev_lba, lba); |
99 | |
100 | if (lba < prev_lba && prev_lba - lba < PicoCDBuffers) |
101 | { |
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102 | read_len = prev_lba - lba; |
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103 | dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len); |
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104 | memmove(cd_buffer + read_len*2048, cd_buffer, (PicoCDBuffers - read_len)*2048); |
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105 | moved = 1; |
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106 | } |
107 | else |
108 | { |
109 | read_len = PicoCDBuffers; |
110 | } |
111 | |
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112 | if (PicoMessage != NULL && read_len >= 512) |
113 | { |
114 | PicoMessage("Buffering data..."); |
115 | } |
116 | |
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117 | if (is_bin) |
118 | { |
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119 | int i = 0; |
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120 | #ifdef _PSP_FW_VERSION |
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121 | int bufs = (read_len*2048) / (2048+304); |
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122 | pm_read(cd_buffer, bufs*(2048+304), Pico_mcd->TOC.Tracks[0].F); |
123 | for (i = 1; i < bufs; i++) |
124 | // should really use memmove here, but my memcpy32 implementation is also suitable here |
125 | memcpy32((int *)(cd_buffer + i*2048), (int *)(cd_buffer + i*(2048+304)), 2048/4); |
126 | #endif |
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127 | for (; i < read_len - 1; i++) |
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128 | { |
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129 | pm_read(cd_buffer + i*2048, 2048 + 304, Pico_mcd->TOC.Tracks[0].F); |
130 | // pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); // seeking is slower, in PSP case even more |
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131 | } |
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132 | // further data might be moved, do not overwrite |
133 | pm_read(cd_buffer + i*2048, 2048, Pico_mcd->TOC.Tracks[0].F); |
134 | pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR); |
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135 | } |
136 | else |
137 | { |
138 | pm_read(cd_buffer, read_len*2048, Pico_mcd->TOC.Tracks[0].F); |
139 | } |
140 | memcpy32(dest, (int *) cd_buffer, 2048/4); |
141 | prev_lba = lba; |
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142 | |
143 | if (moved) |
144 | { |
145 | /* file pointer must point to the same data in file, as would-be data after our buffer */ |
146 | int where_seek; |
147 | lba += PicoCDBuffers; |
148 | where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11); |
149 | pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET); |
150 | } |
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151 | } |
152 | |