sdl-ios-xcode: src/audio/dummy/SDL

annotate src/audio/dummy/SDL_dummyaudio.c @ 3796:b19680c84cdf SDL-ryan-multiple-audio-device

Bunch of 1.3 audio cleanups to remove FIXMEs, get driver specific crap out of the core and into the drivers where it belongs, and push generic responsibilities out of the drivers and into the core where they belong.

author	Ryan C. Gordon <icculus@icculus.org>
date	Wed, 04 Oct 2006 19:54:23 +0000
parents	866c310e2cb5
children	c8b3d3d13ed1

rev	line source
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	1 /*
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	2 SDL - Simple DirectMedia Layer
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	3 Copyright (C) 1997-2006 Sam Lantinga
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	4
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	5 This library is free software; you can redistribute it and/or
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	6 modify it under the terms of the GNU Lesser General Public
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	7 License as published by the Free Software Foundation; either
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	8 version 2.1 of the License, or (at your option) any later version.
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	9
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	13 Lesser General Public License for more details.
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	14
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	15 You should have received a copy of the GNU Lesser General Public
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	16 License along with this library; if not, write to the Free Software
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	18
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	19 Sam Lantinga
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	20 slouken@libsdl.org
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	21
1537 60620d71e324 Corrected dummy audio callback firing to be realistic, cleaned up tabs. Ryan C. Gordon <icculus@icculus.org> parents: 1533 diff changeset	22 This file written by Ryan C. Gordon (icculus@icculus.org)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	23 */
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	24 #include "SDL_config.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	25
1533 38c1eb6b0083 By default all the real targets have dummy audio/video and disk audio. Sam Lantinga <slouken@libsdl.org> parents: 1532 diff changeset	26 /* Output audio to nowhere... */
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	27
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	28 #include "SDL_rwops.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	29 #include "SDL_timer.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	30 #include "SDL_audio.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	31 #include "../SDL_audiomem.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	32 #include "../SDL_audio_c.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	33 #include "../SDL_audiodev_c.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	34 #include "SDL_dummyaudio.h"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	35
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	36 /* The tag name used by DUMMY audio */
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	37 #define DUMMYAUD_DRIVER_NAME "dummy"
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	38
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	39 /* Audio driver functions */
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	40 static int DUMMYAUD_OpenDevice(_THIS, const char *devname, int iscapture);
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	41 static void DUMMYAUD_WaitDevice(_THIS);
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	42 static void DUMMYAUD_PlayDevice(_THIS);
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	43 static Uint8 *DUMMYAUD_GetDeviceBuf(_THIS);
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	44 static void DUMMYAUD_CloseDevice(_THIS);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	45
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	46 /* Audio driver bootstrap functions */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	47 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	48 DUMMYAUD_Available(void)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	49 {
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	50 /* !!! FIXME: check this at a higher level... */
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	51 /* only ever use this driver if explicitly requested. */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	52 const char *envr = SDL_getenv("SDL_AUDIODRIVER");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	53 if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	54 return (1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	55 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	56 return (0);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	57 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	58
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	59 static int
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	60 DUMMYAUD_Init(SDL_AudioDriverImpl *impl)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	61 {
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	62 /* Set the function pointers */
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	63 impl->OpenDevice = DUMMYAUD_OpenDevice;
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	64 impl->WaitDevice = DUMMYAUD_WaitDevice;
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	65 impl->PlayDevice = DUMMYAUD_PlayDevice;
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	66 impl->GetDeviceBuf = DUMMYAUD_GetDeviceBuf;
866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	67 impl->CloseDevice = DUMMYAUD_CloseDevice;
3796 b19680c84cdf Bunch of 1.3 audio cleanups to remove FIXMEs, get driver specific crap out of Ryan C. Gordon <icculus@icculus.org> parents: 3792 diff changeset	68 impl->OnlyHasDefaultOutputDevice = 1;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	69
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	70 return 1;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	71 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	72
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	73 AudioBootStrap DUMMYAUD_bootstrap = {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	74 DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	75 DUMMYAUD_Available, DUMMYAUD_Init
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	76 };
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	77
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	78 /* This function waits until it is possible to write a full sound buffer */
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	79 static void
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	80 DUMMYAUD_WaitDevice(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	81 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	82 /* Don't block on first calls to simulate initial fragment filling. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	83 if (this->hidden->initial_calls)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	84 this->hidden->initial_calls--;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	85 else
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	86 SDL_Delay(this->hidden->write_delay);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	87 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	88
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	89 static void
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	90 DUMMYAUD_PlayDevice(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	91 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	92 /* no-op...this is a null driver. */
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	93 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	94
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	95 static Uint8 *
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	96 DUMMYAUD_GetDeviceBuf(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	97 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	98 return (this->hidden->mixbuf);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	99 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	100
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	101 static void
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	102 DUMMYAUD_CloseDevice(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	103 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	104 if (this->hidden->mixbuf != NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	105 SDL_FreeAudioMem(this->hidden->mixbuf);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	106 this->hidden->mixbuf = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	107 }
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	108 SDL_free(this->hidden);
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	109 this->hidden = NULL;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	110 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	111
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	112 static int
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	113 DUMMYAUD_OpenDevice(_THIS, const char *devname, int iscapture)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	114 {
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	115 float bytes_per_sec = 0.0f;
1537 60620d71e324 Corrected dummy audio callback firing to be realistic, cleaned up tabs. Ryan C. Gordon <icculus@icculus.org> parents: 1533 diff changeset	116
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	117 /* Initialize all variables that we clean on shutdown */
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	118 this->hidden = (struct SDL_PrivateAudioData *)
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	119 SDL_malloc((sizeof *this->hidden));
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	120 if (this->hidden == NULL) {
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	121 SDL_OutOfMemory();
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	122 return 0;
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	123 }
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	124 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	125
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	126 /* Allocate mixing buffer */
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	127 this->hidden->mixlen = this->spec.size;
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	128 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	129 if (this->hidden->mixbuf == NULL) {
3792 866c310e2cb5 Changed some 1.3 audio symbol names. Ryan C. Gordon <icculus@icculus.org> parents: 3784 diff changeset	130 DUMMYAUD_CloseDevice(this);
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	131 return 0;
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	132 }
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	133 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	134
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	135 bytes_per_sec = (float) (SDL_AUDIO_BITSIZE(this->spec.format) / 8) *
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	136 this->spec.channels * this->spec.freq;
1537 60620d71e324 Corrected dummy audio callback firing to be realistic, cleaned up tabs. Ryan C. Gordon <icculus@icculus.org> parents: 1533 diff changeset	137
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	138 /*
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	139 * We try to make this request more audio at the correct rate for
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	140 * a given audio spec, so timing stays fairly faithful.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	141 * Also, we have it not block at all for the first two calls, so
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	142 * it seems like we're filling two audio fragments right out of the
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	143 * gate, like other SDL drivers tend to do.
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	144 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	145 this->hidden->initial_calls = 2;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	146 this->hidden->write_delay =
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	147 (Uint32) ((((float) this->spec.size) / bytes_per_sec) * 1000.0f);
1537 60620d71e324 Corrected dummy audio callback firing to be realistic, cleaned up tabs. Ryan C. Gordon <icculus@icculus.org> parents: 1533 diff changeset	148
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	149 /* We're ready to rock and roll. :-) */
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	150 return 1;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	151 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	152
1895 c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head. Sam Lantinga <slouken@libsdl.org> parents: 1538 diff changeset	153 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/audio/dummy/SDL_dummyaudio.c @ 3796:b19680c84cdf SDL-ryan-multiple-audio-device