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

annotate src/audio/dummy/SDL_dummyaudio.c @ 3784:37c9c4590689 SDL-ryan-multiple-audio-device

First batch of heavy lifting on supporting multiple audio devices at once. This has a long way to go yet, most of the drivers aren't updated for the new interfaces, and it's still got some obvious bugs, FIXMEs, and wistlist items. Don't use yet.

author	Ryan C. Gordon <icculus@icculus.org>
date	Sun, 01 Oct 2006 05:24:03 +0000
parents	c121d94672cb
children	866c310e2cb5

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 */
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	40 static int DUMMYAUD_OpenAudio(_THIS, const char *devname, int iscapture);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	41 static void DUMMYAUD_WaitAudio(_THIS);
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	42 static void DUMMYAUD_PlayAudio(_THIS);
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	43 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	44 static void DUMMYAUD_CloseAudio(_THIS);
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 */
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	63 impl->OpenAudio = DUMMYAUD_OpenAudio;
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	64 impl->WaitAudio = DUMMYAUD_WaitAudio;
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	65 impl->PlayAudio = DUMMYAUD_PlayAudio;
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	66 impl->GetAudioBuf = DUMMYAUD_GetAudioBuf;
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	67 impl->CloseAudio = DUMMYAUD_CloseAudio;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	68
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	69 return 1;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	70 }
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 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	73 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	74 DUMMYAUD_Available, DUMMYAUD_Init
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	75 };
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 /* 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	78 static void
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 DUMMYAUD_WaitAudio(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	80 {
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	81 /* 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	82 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	83 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 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	85 SDL_Delay(this->hidden->write_delay);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	86 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	87
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	88 static void
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 DUMMYAUD_PlayAudio(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	90 {
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	91 /* no-op...this is a null driver. */
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	92 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	93
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	94 static Uint8 *
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 DUMMYAUD_GetAudioBuf(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	96 {
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	97 return (this->hidden->mixbuf);
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	98 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	99
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	100 static void
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 DUMMYAUD_CloseAudio(_THIS)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	102 {
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	103 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	104 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	105 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	106 }
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	107 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	108 this->hidden = NULL;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	109 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	110
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	111 static int
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	112 DUMMYAUD_OpenAudio(_THIS, const char *devname, int iscapture)
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	113 {
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	114 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	115
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	116 /* 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	117 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	118 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	119 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	120 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	121 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	122 }
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	123 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	124
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	125 /* 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	126 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	127 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	128 if (this->hidden->mixbuf == NULL) {
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	129 DUMMYAUD_CloseAudio(this);
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	130 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	131 }
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	132 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	133
3784 37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once. Ryan C. Gordon <icculus@icculus.org> parents: 1895 diff changeset	134 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	135 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	136
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	137 /*
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 * 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	139 * 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	140 * 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	141 * 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	142 * 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	143 */
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 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	145 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	146 (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	147
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	148 /* 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	149 return 1;
1532 30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	150 }
30f189cdd82b Implemented dummy audio driver. Ryan C. Gordon <icculus@icculus.org> parents: diff changeset	151
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	152 /* vi: set ts=4 sw=4 expandtab: */

Mercurial > sdl-ios-xcode

annotate src/audio/dummy/SDL_dummyaudio.c @ 3784:37c9c4590689 SDL-ryan-multiple-audio-device