Mercurial > sdl-ios-xcode
annotate include/SDL_endian.h @ 942:41a59de7f2ed
Here are patches for SDL12 and SDL_mixer for 4 or 6 channel
surround sound on Linux using the Alsa driver. To use them, naturally
you need a sound card that will do 4 or 6 channels and probably also a
recent version of the Alsa drivers and library. Since the only SDL
output driver that knows about surround sound is the Alsa driver,
you���ll want to choose it, using:
export SDL_AUDIODRIVER=alsa
There are no syntactic changes to the programming API. No new
library calls, no differences in arguments.
There are two semantic changes:
(1) For library calls with number of channels as an argument, formerly
you could use only 1 or 2 for the number of channels. Now you
can also use 4 or 6.
(2) The two "left" and "right" arguments to Mix_SetPanning, for the
case of 4 or 6 channels, no longer simply control the volumes of
the left and right channels. Now the "left" argument is converted
to an angle and Mix_SetPosition is called, and the "right" argu-
ment is ignored.
With two exceptions, so far as I know, the modified SDL12 and
SDL_mixer work the same way as the original versions, when opened for
1 or 2 channel output. The two exceptions are bugs which I fixed.
Well, the first, anyway, is a bug for sure. When rate conversions up
or down by a factor of two are applied (in src/audio/SDL_audiocvt.c),
streams with different numbers of channels (that is, mono and stereo)
are treated the same way: either each sample is copied or every other
sample is omitted. This is ok for mono, but for stereo, it is frames
that should be copied or omitted, where by "frame" I mean a portion of
the stream containing one sample for each channel. (In the SDL source,
confusingly, sometimes frames are called "samples".) So for these
rate conversions, stereo streams have to be treated differently, and
they are, in my modified version.
The other problem that might be characterized as a bug arises
when SDL_mixer is passed a multichannel chunk which does not have an
integral number of frames. Due to the way the effect_position code
loops over frames, when the chunk ends with a partial frame, memory
outside the chunk buffer will be accessed. In the case of stereo,
it���s possible that because malloc may give more memory than requested,
this potential problem never actually causes a segment fault. I don���t
know. For 6 channel chunks, I do know, and it does cause segment
faults.
If SDL_mixer is passed defective chunks and this causes a segment
fault, arguably, that���s not a bug in SDL_mixer. Still, whether or not
it counts as a bug, it���s easy to protect against, so why not? I added
code in mixer.c to discard any partial frame at the end of a chunk.
Then what about when SDL or SDL_mixer is opened for 4 or 6 chan-
nel output? What happens with the parts of the current library
designed for stereo? I don���t know whether I���ve covered all the bases,
but I���ve tried:
(1) For playing 2 channel waves, or other cases where SDL knows it has
to match up a 2 channel source with a 4 or 6 channel output, I���ve
added code in SDL_audiocvt.c to make the necessary conversions.
(2) For playing midis using timidity, I���ve converted timidity to do 4
or 6 channel output, upon request.
(3) For playing mods using mikmod, I put ad hoc code in music.c to
convert the stereo output that mikmod produces to 4 or 6 chan-
nels. Obviously it would be better to change the mikmod code to
mix down into 4 or 6 channels, but I have a hard time following
the code in mikmod, so I didn���t do that.
(4) For playing mp3s, I put ad hoc code in smpeg to copy channels in
the case when 4 or 6 channel output is needed.
(5) There seems to be no problem with .ogg files - stereo .oggs can be
up converted as .wavs are.
(6) The effect_position code in SDL_mixer is now generalized to in-
clude the cases of 4 and 6 channel streams.
I���ve done a very limited amount of compatibility testing for some
of the games using SDL I happen to have. For details, see the file
TESTS.
I���ve put into a separate archive, Surround-SDL-testfiles.tgz, a
couple of 6 channel wave files for testing and a 6 channel ogg file.
If you have the right hardware and version of Alsa, you should be able
to play the wave files with the Alsa utility aplay (and hear all
channels, except maybe lfe, for chan-id.wav, since it���s rather faint).
Don���t expect aplay to give good sound, though. There���s something
wrong with the current version of aplay.
The canyon.ogg file is to test loading of 6 channel oggs. After
patching and compiling, you can play it with playmus. (My version of
ogg123 will not play it, and I had to patch mplayer to get it to play
6 channel oggs.)
Greg Lee <greg@ling.lll.hawaii.edu>
Thus, July 1, 2004
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 21 Aug 2004 12:27:02 +0000 |
parents | 6b28c91bf3d2 |
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rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 /* Functions for reading and writing endian-specific values */ | |
29 | |
30 #ifndef _SDL_endian_h | |
31 #define _SDL_endian_h | |
32 | |
33 /* These functions read and write data of the specified endianness, | |
34 dynamically translating to the host machine endianness. | |
35 | |
36 e.g.: If you want to read a 16 bit value on big-endian machine from | |
37 an open file containing little endian values, you would use: | |
38 value = SDL_ReadLE16(rp); | |
39 Note that the read/write functions use SDL_RWops pointers | |
40 instead of FILE pointers. This allows you to read and write | |
41 endian values from large chunks of memory as well as files | |
42 and other data sources. | |
43 */ | |
44 | |
45 #include <stdio.h> | |
46 | |
47 #include "SDL_types.h" | |
48 #include "SDL_rwops.h" | |
49 #include "SDL_byteorder.h" | |
50 | |
51 #include "begin_code.h" | |
52 /* Set up for C function definitions, even when using C++ */ | |
53 #ifdef __cplusplus | |
54 extern "C" { | |
55 #endif | |
56 | |
57 /* Use inline functions for compilers that support them, and static | |
58 functions for those that do not. Because these functions become | |
59 static for compilers that do not support inline functions, this | |
60 header should only be included in files that actually use them. | |
61 */ | |
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62 #if defined(__GNUC__) && defined(__i386__) |
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63 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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64 { |
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65 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x)); |
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66 return x; |
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67 } |
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68 #elif defined(__GNUC__) && defined(__x86_64__) |
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69 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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70 { |
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71 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x)); |
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72 return x; |
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73 } |
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74 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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75 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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76 { |
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77 Uint16 result; |
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78 |
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79 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x)); |
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80 return result; |
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81 } |
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82 #else |
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83 static __inline__ Uint16 SDL_Swap16(Uint16 x) { |
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84 return((x<<8)|(x>>8)); |
0 | 85 } |
86 #endif | |
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87 |
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88 #if defined(__GNUC__) && defined(__i386__) |
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89 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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90 { |
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91 __asm__("bswap %0" : "=r" (x) : "0" (x)); |
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92 return x; |
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93 } |
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94 #elif defined(__GNUC__) && defined(__x86_64__) |
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95 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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96 { |
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97 __asm__("bswapl %0" : "=r" (x) : "0" (x)); |
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98 return x; |
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99 } |
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100 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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101 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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102 { |
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103 Uint32 result; |
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104 |
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105 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x)); |
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106 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x)); |
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107 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x)); |
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108 return result; |
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109 } |
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110 #else |
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111 static __inline__ Uint32 SDL_Swap32(Uint32 x) { |
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112 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)); |
0 | 113 } |
114 #endif | |
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115 |
0 | 116 #ifdef SDL_HAS_64BIT_TYPE |
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117 #if defined(__GNUC__) && defined(__i386__) |
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118 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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119 { |
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120 union { |
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121 struct { Uint32 a,b; } s; |
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122 Uint64 u; |
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123 } v; |
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124 v.u = x; |
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125 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
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126 : "=r" (v.s.a), "=r" (v.s.b) |
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127 : "0" (v.s.a), "1" (v.s.b)); |
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128 return v.u; |
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129 } |
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130 #elif defined(__GNUC__) && defined(__x86_64__) |
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131 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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132 { |
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133 __asm__("bswapq %0" : "=r" (x) : "0" (x)); |
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134 return x; |
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135 } |
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136 #else |
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137 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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138 { |
0 | 139 Uint32 hi, lo; |
140 | |
141 /* Separate into high and low 32-bit values and swap them */ | |
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142 lo = (Uint32)(x&0xFFFFFFFF); |
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143 x >>= 32; |
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144 hi = (Uint32)(x&0xFFFFFFFF); |
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145 x = SDL_Swap32(lo); |
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146 x <<= 32; |
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147 x |= SDL_Swap32(hi); |
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148 return(x); |
0 | 149 } |
150 #endif | |
151 #else | |
152 /* This is mainly to keep compilers from complaining in SDL code. | |
153 If there is no real 64-bit datatype, then compilers will complain about | |
154 the fake 64-bit datatype that SDL provides when it compiles user code. | |
155 */ | |
156 #define SDL_Swap64(X) (X) | |
157 #endif /* SDL_HAS_64BIT_TYPE */ | |
158 | |
159 | |
160 /* Byteswap item from the specified endianness to the native endianness */ | |
161 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
162 #define SDL_SwapLE16(X) (X) | |
163 #define SDL_SwapLE32(X) (X) | |
164 #define SDL_SwapLE64(X) (X) | |
165 #define SDL_SwapBE16(X) SDL_Swap16(X) | |
166 #define SDL_SwapBE32(X) SDL_Swap32(X) | |
167 #define SDL_SwapBE64(X) SDL_Swap64(X) | |
168 #else | |
169 #define SDL_SwapLE16(X) SDL_Swap16(X) | |
170 #define SDL_SwapLE32(X) SDL_Swap32(X) | |
171 #define SDL_SwapLE64(X) SDL_Swap64(X) | |
172 #define SDL_SwapBE16(X) (X) | |
173 #define SDL_SwapBE32(X) (X) | |
174 #define SDL_SwapBE64(X) (X) | |
175 #endif | |
176 | |
177 /* Read an item of the specified endianness and return in native format */ | |
337
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178 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src); |
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179 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src); |
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180 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src); |
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181 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src); |
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182 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src); |
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183 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src); |
0 | 184 |
185 /* Write an item of native format to the specified endianness */ | |
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186 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value); |
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187 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value); |
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188 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value); |
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189 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value); |
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190 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value); |
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191 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value); |
0 | 192 |
193 | |
194 /* Ends C function definitions when using C++ */ | |
195 #ifdef __cplusplus | |
196 } | |
197 #endif | |
198 #include "close_code.h" | |
199 | |
200 #endif /* _SDL_endian_h */ |