Mercurial > sdl-ios-xcode
annotate src/audio/alsa/SDL_alsa_audio.h @ 4001:6831b8723a85 SDL-1.2
Don't initialize the audio buffer passed to the application's audio callback,
since they are expected to entirely fill it with data or silence.
For legacy apps that might expect the buffer to already have silence and thus
may not fill the buffer in the callback, there's an environment variable to
expose the old behaviour.
Fixes Bugzilla #416.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jul 2007 02:24:36 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
757
diff
changeset
|
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 | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
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20 slouken@libsdl.org |
| 0 | 21 */ |
|
1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1361
diff
changeset
|
22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #ifndef _ALSA_PCM_audio_h | |
| 25 #define _ALSA_PCM_audio_h | |
| 26 | |
|
757
4f46fee887fe
Date: Sun, 14 Dec 2003 15:16:12 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
354
diff
changeset
|
27 #define ALSA_PCM_OLD_HW_PARAMS_API |
|
4f46fee887fe
Date: Sun, 14 Dec 2003 15:16:12 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
354
diff
changeset
|
28 #define ALSA_PCM_OLD_SW_PARAMS_API |
|
354
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
29 #include <alsa/asoundlib.h> |
| 0 | 30 |
|
1361
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
31 #include "../SDL_sysaudio.h" |
|
19418e4422cb
New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
|
32 |
| 0 | 33 /* Hidden "this" pointer for the video functions */ |
| 34 #define _THIS SDL_AudioDevice *this | |
| 35 | |
| 36 struct SDL_PrivateAudioData { | |
| 37 /* The audio device handle */ | |
|
354
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
38 snd_pcm_t *pcm_handle; |
| 0 | 39 |
| 40 /* The parent process id, to detect when application quits */ | |
| 41 pid_t parent; | |
| 42 | |
| 43 /* Raw mixing buffer */ | |
|
354
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
44 Uint8 *mixbuf; |
|
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
45 int mixlen; |
| 0 | 46 }; |
| 47 | |
| 48 /* Old variable names */ | |
|
354
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
49 #define pcm_handle (this->hidden->pcm_handle) |
| 0 | 50 #define parent (this->hidden->parent) |
|
354
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
51 #define mixbuf (this->hidden->mixbuf) |
|
30935e76acb5
Updated ALSA audio support for ALSA 0.9
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
52 #define mixlen (this->hidden->mixlen) |
| 0 | 53 |
| 54 #endif /* _ALSA_PCM_audio_h */ |