diff src/audio/dummy/SDL_dummyaudio.c @ 2049:5f6550e5184f

Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 09:15:21 +0000
parents c121d94672cb
children 866052b01ee5
line wrap: on
line diff
--- a/src/audio/dummy/SDL_dummyaudio.c	Sun Oct 01 16:10:41 2006 +0000
+++ b/src/audio/dummy/SDL_dummyaudio.c	Tue Oct 17 09:15:21 2006 +0000
@@ -25,141 +25,27 @@
 
 /* Output audio to nowhere... */
 
-#include "SDL_rwops.h"
-#include "SDL_timer.h"
 #include "SDL_audio.h"
-#include "../SDL_audiomem.h"
 #include "../SDL_audio_c.h"
-#include "../SDL_audiodev_c.h"
 #include "SDL_dummyaudio.h"
 
-/* The tag name used by DUMMY audio */
-#define DUMMYAUD_DRIVER_NAME         "dummy"
-
-/* Audio driver functions */
-static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec);
-static void DUMMYAUD_WaitAudio(_THIS);
-static void DUMMYAUD_PlayAudio(_THIS);
-static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
-static void DUMMYAUD_CloseAudio(_THIS);
-
-/* Audio driver bootstrap functions */
 static int
-DUMMYAUD_Available(void)
+DUMMYAUD_OpenDevice(_THIS, const char *devname, int iscapture)
 {
-    const char *envr = SDL_getenv("SDL_AUDIODRIVER");
-    if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
-        return (1);
-    }
-    return (0);
+    return 1;   /* always succeeds. */
 }
 
-static void
-DUMMYAUD_DeleteDevice(SDL_AudioDevice * device)
-{
-    SDL_free(device->hidden);
-    SDL_free(device);
-}
-
-static SDL_AudioDevice *
-DUMMYAUD_CreateDevice(int devindex)
+static int
+DUMMYAUD_Init(SDL_AudioDriverImpl *impl)
 {
-    SDL_AudioDevice *this;
-
-    /* Initialize all variables that we clean on shutdown */
-    this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
-    if (this) {
-        SDL_memset(this, 0, (sizeof *this));
-        this->hidden = (struct SDL_PrivateAudioData *)
-            SDL_malloc((sizeof *this->hidden));
-    }
-    if ((this == NULL) || (this->hidden == NULL)) {
-        SDL_OutOfMemory();
-        if (this) {
-            SDL_free(this);
-        }
-        return (0);
-    }
-    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
-
     /* Set the function pointers */
-    this->OpenAudio = DUMMYAUD_OpenAudio;
-    this->WaitAudio = DUMMYAUD_WaitAudio;
-    this->PlayAudio = DUMMYAUD_PlayAudio;
-    this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
-    this->CloseAudio = DUMMYAUD_CloseAudio;
-
-    this->free = DUMMYAUD_DeleteDevice;
-
-    return this;
+    impl->OpenDevice = DUMMYAUD_OpenDevice;
+    impl->OnlyHasDefaultOutputDevice = 1;
+    return 1;
 }
 
 AudioBootStrap DUMMYAUD_bootstrap = {
-    DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
-    DUMMYAUD_Available, DUMMYAUD_CreateDevice
+    "dummy", "SDL dummy audio driver", DUMMYAUD_Init, 1
 };
 
-/* This function waits until it is possible to write a full sound buffer */
-static void
-DUMMYAUD_WaitAudio(_THIS)
-{
-    /* Don't block on first calls to simulate initial fragment filling. */
-    if (this->hidden->initial_calls)
-        this->hidden->initial_calls--;
-    else
-        SDL_Delay(this->hidden->write_delay);
-}
-
-static void
-DUMMYAUD_PlayAudio(_THIS)
-{
-    /* no-op...this is a null driver. */
-}
-
-static Uint8 *
-DUMMYAUD_GetAudioBuf(_THIS)
-{
-    return (this->hidden->mixbuf);
-}
-
-static void
-DUMMYAUD_CloseAudio(_THIS)
-{
-    if (this->hidden->mixbuf != NULL) {
-        SDL_FreeAudioMem(this->hidden->mixbuf);
-        this->hidden->mixbuf = NULL;
-    }
-}
-
-static int
-DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
-{
-    float bytes_per_sec = 0.0f;
-
-    /* Allocate mixing buffer */
-    this->hidden->mixlen = spec->size;
-    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
-    if (this->hidden->mixbuf == NULL) {
-        return (-1);
-    }
-    SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
-
-    bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
-                             spec->channels * spec->freq);
-
-    /*
-     * We try to make this request more audio at the correct rate for
-     *  a given audio spec, so timing stays fairly faithful.
-     * Also, we have it not block at all for the first two calls, so
-     *  it seems like we're filling two audio fragments right out of the
-     *  gate, like other SDL drivers tend to do.
-     */
-    this->hidden->initial_calls = 2;
-    this->hidden->write_delay =
-        (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
-
-    /* We're ready to rock and roll. :-) */
-    return (0);
-}
-
 /* vi: set ts=4 sw=4 expandtab: */