Mercurial > sdl-ios-xcode
annotate src/thread/win32/SDL_sysmutex.c @ 3880:74e828c64315 SDL-1.2
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:45:37 +0000 |
| parents | bb6839704ed6 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
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Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
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Use consistent identifiers for the various platforms we support.
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Mutex functions using the Win32 API */ | |
| 25 | |
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SDL_windows.h is no longer necessary
Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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26 #define WIN32_LEAN_AND_MEAN |
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bb6839704ed6
SDL_windows.h is no longer necessary
Sam Lantinga <slouken@libsdl.org>
parents:
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27 #include <windows.h> |
| 0 | 28 |
| 29 #include "SDL_mutex.h" | |
| 30 | |
| 31 | |
| 32 struct SDL_mutex { | |
| 33 HANDLE id; | |
| 34 }; | |
| 35 | |
| 36 /* Create a mutex */ | |
| 37 SDL_mutex *SDL_CreateMutex(void) | |
| 38 { | |
| 39 SDL_mutex *mutex; | |
| 40 | |
| 41 /* Allocate mutex memory */ | |
|
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Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
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42 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex)); |
| 0 | 43 if ( mutex ) { |
| 44 /* Create the mutex, with initial value signaled */ | |
| 45 mutex->id = CreateMutex(NULL, FALSE, NULL); | |
| 46 if ( ! mutex->id ) { | |
| 47 SDL_SetError("Couldn't create mutex"); | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1330
diff
changeset
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48 SDL_free(mutex); |
| 0 | 49 mutex = NULL; |
| 50 } | |
| 51 } else { | |
| 52 SDL_OutOfMemory(); | |
| 53 } | |
| 54 return(mutex); | |
| 55 } | |
| 56 | |
| 57 /* Free the mutex */ | |
| 58 void SDL_DestroyMutex(SDL_mutex *mutex) | |
| 59 { | |
| 60 if ( mutex ) { | |
| 61 if ( mutex->id ) { | |
| 62 CloseHandle(mutex->id); | |
| 63 mutex->id = 0; | |
| 64 } | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1330
diff
changeset
|
65 SDL_free(mutex); |
| 0 | 66 } |
| 67 } | |
| 68 | |
| 69 /* Lock the mutex */ | |
| 70 int SDL_mutexP(SDL_mutex *mutex) | |
| 71 { | |
| 72 if ( mutex == NULL ) { | |
| 73 SDL_SetError("Passed a NULL mutex"); | |
| 74 return -1; | |
| 75 } | |
| 76 if ( WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED ) { | |
| 77 SDL_SetError("Couldn't wait on mutex"); | |
| 78 return -1; | |
| 79 } | |
| 80 return(0); | |
| 81 } | |
| 82 | |
| 83 /* Unlock the mutex */ | |
| 84 int SDL_mutexV(SDL_mutex *mutex) | |
| 85 { | |
| 86 if ( mutex == NULL ) { | |
| 87 SDL_SetError("Passed a NULL mutex"); | |
| 88 return -1; | |
| 89 } | |
| 90 if ( ReleaseMutex(mutex->id) == FALSE ) { | |
| 91 SDL_SetError("Couldn't release mutex"); | |
| 92 return -1; | |
| 93 } | |
| 94 return(0); | |
| 95 } |