Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_AudioSpec.3 @ 4168:69bcba65c388 SDL-1.2
Fixed bug #526
Comment #1 From Simon Howard 2009-03-20 16:50:56
Hi,
I'm the author of Chocolate Doom, one of the other source ports that James
mentioned. This is a patch against the current SVN version of SDL 1.2 that
fixes the bug. It has been tested and hopefully should be obviously correct
from examining the changes. I'll give a brief explanation.
When the palette is set with SDL_SetPalette, the IDirectDrawPalette_SetEntries
DirectX function is invoked. However, when this happens, a WM_PALETTECHANGED
message is sent to the window.
A WM_PALETTECHANGED message can also be received if the palette is changed for
some other reason, like if the system palette is changed. Therefore, the
palette change handler (DX5_PaletteChanged) has code to deal with this case.
It distinguishes "expected" palette changes (set with SDL_SetPalette) from
"unexpected" palette changes using the colorchange_expected variable, which is
set before calling IDirectDrawPalette_SetEntries. However, the code to set
this variable is missing in the fullscreen code path. By setting this
variable, the palette change is handled properly and the freezes go away.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 13 Apr 2009 00:53:12 +0000 |
| parents | 4e3b250c950e |
| children | 1238da4a7112 |
| rev | line source |
|---|---|
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
1 .TH "SDL_AudioSpec" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
|
4107
4e3b250c950e
Erik Heckers fixed bug #493
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
3 SDL_AudioSpec \- Audio Specification Structure |
| 0 | 4 .SH "STRUCTURE DEFINITION" |
| 5 .PP | |
| 6 .nf | |
| 7 \f(CWtypedef struct{ | |
| 8 int freq; | |
| 9 Uint16 format; | |
| 10 Uint8 channels; | |
| 11 Uint8 silence; | |
| 12 Uint16 samples; | |
| 13 Uint32 size; | |
| 14 void (*callback)(void *userdata, Uint8 *stream, int len); | |
| 15 void *userdata; | |
| 16 } SDL_AudioSpec;\fR | |
| 17 .fi | |
| 18 .PP | |
| 19 .SH "STRUCTURE DATA" | |
| 20 .TP 20 | |
| 21 \fBfreq\fR | |
| 22 Audio frequency in samples per second | |
| 23 .TP 20 | |
| 24 \fBformat\fR | |
| 25 Audio data format | |
| 26 .TP 20 | |
| 27 \fBchannels\fR | |
| 28 Number of channels: 1 mono, 2 stereo | |
| 29 .TP 20 | |
| 30 \fBsilence\fR | |
| 31 Audio buffer silence value (calculated) | |
| 32 .TP 20 | |
| 33 \fBsamples\fR | |
| 34 Audio buffer size in samples | |
| 35 .TP 20 | |
| 36 \fBsize\fR | |
| 37 Audio buffer size in bytes (calculated) | |
| 38 .TP 20 | |
| 39 \fBcallback(\&.\&.)\fR | |
| 40 Callback function for filling the audio buffer | |
| 41 .TP 20 | |
| 42 \fBuserdata\fR | |
| 43 Pointer the user data which is passed to the callback function | |
| 44 .SH "DESCRIPTION" | |
| 45 .PP | |
| 46 The \fBSDL_AudioSpec\fR structure is used to describe the format of some audio data\&. This structure is used by \fI\fBSDL_OpenAudio\fP\fR and \fI\fBSDL_LoadWAV\fP\fR\&. While all fields are used by \fBSDL_OpenAudio\fP only \fBfreq\fR, \fBformat\fR, \fBsamples\fR and \fBchannels\fR are used by \fBSDL_LoadWAV\fP\&. We will detail these common members here\&. | |
| 47 .TP 20 | |
| 48 \fBfreq\fR | |
| 49 The number of samples sent to the sound device every second\&. Common values are 11025, 22050 and 44100\&. The higher the better\&. | |
| 50 .TP 20 | |
| 51 \fBformat\fR | |
| 52 Specifies the size and type of each sample element | |
| 53 .IP "\fBAUDIO_U8\fP" 10Unsigned 8-bit samples | |
| 54 .IP "\fBAUDIO_S8\fP" 10Signed 8-bit samples | |
| 55 .IP "\fBAUDIO_U16\fP or \fBAUDIO_U16LSB\fP" 10Unsigned 16-bit little-endian samples | |
| 56 .IP "\fBAUDIO_S16\fP or \fBAUDIO_S16LSB\fP" 10Signed 16-bit little-endian samples | |
| 57 .IP "\fBAUDIO_U16MSB\fP" 10Unsigned 16-bit big-endian samples | |
| 58 .IP "\fBAUDIO_S16MSB\fP" 10Signed 16-bit big-endian samples | |
| 59 .IP "\fBAUDIO_U16SYS\fP" 10Either \fBAUDIO_U16LSB\fP or \fBAUDIO_U16MSB\fP depending on you systems endianness | |
| 60 .IP "\fBAUDIO_S16SYS\fP" 10Either \fBAUDIO_S16LSB\fP or \fBAUDIO_S16MSB\fP depending on you systems endianness | |
| 61 .TP 20 | |
| 62 \fBchannels\fR | |
| 63 The number of seperate sound channels\&. 1 is mono (single channel), 2 is stereo (dual channel)\&. | |
| 64 .TP 20 | |
| 65 \fBsamples\fR | |
| 66 When used with \fI\fBSDL_OpenAudio\fP\fR this refers to the size of the audio buffer in samples\&. A sample a chunk of audio data of the size specified in \fBformat\fR mulitplied by the number of channels\&. When the \fBSDL_AudioSpec\fR is used with \fI\fBSDL_LoadWAV\fP\fR \fBsamples\fR is set to 4096\&. | |
| 67 .SH "SEE ALSO" | |
| 68 .PP | |
| 69 \fI\fBSDL_OpenAudio\fP\fR, \fI\fBSDL_LoadWAV\fP\fR | |
|
181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
|
70 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58 |