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

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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
line wrap: on
line diff
--- a/src/audio/dummy/SDL_dummyaudio.c	Sun Oct 01 05:21:40 2006 +0000
+++ b/src/audio/dummy/SDL_dummyaudio.c	Sun Oct 01 05:24:03 2006 +0000
@@ -37,7 +37,7 @@
 #define DUMMYAUD_DRIVER_NAME         "dummy"
 
 /* Audio driver functions */
-static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec);
+static int DUMMYAUD_OpenAudio(_THIS, const char *devname, int iscapture);
 static void DUMMYAUD_WaitAudio(_THIS);
 static void DUMMYAUD_PlayAudio(_THIS);
 static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
@@ -47,6 +47,8 @@
 static int
 DUMMYAUD_Available(void)
 {
+    /* !!! FIXME: check this at a higher level... */
+    /* only ever use this driver if explicitly requested. */
     const char *envr = SDL_getenv("SDL_AUDIODRIVER");
     if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
         return (1);
@@ -54,49 +56,22 @@
     return (0);
 }
 
-static void
-DUMMYAUD_DeleteDevice(SDL_AudioDevice * device)
+static int
+DUMMYAUD_Init(SDL_AudioDriverImpl *impl)
 {
-    SDL_free(device->hidden);
-    SDL_free(device);
-}
-
-static SDL_AudioDevice *
-DUMMYAUD_CreateDevice(int devindex)
-{
-    SDL_AudioDevice *this;
+    /* Set the function pointers */
+    impl->OpenAudio = DUMMYAUD_OpenAudio;
+    impl->WaitAudio = DUMMYAUD_WaitAudio;
+    impl->PlayAudio = DUMMYAUD_PlayAudio;
+    impl->GetAudioBuf = DUMMYAUD_GetAudioBuf;
+    impl->CloseAudio = DUMMYAUD_CloseAudio;
 
-    /* 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;
+    return 1;
 }
 
 AudioBootStrap DUMMYAUD_bootstrap = {
     DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
-    DUMMYAUD_Available, DUMMYAUD_CreateDevice
+    DUMMYAUD_Available, DUMMYAUD_Init
 };
 
 /* This function waits until it is possible to write a full sound buffer */
@@ -129,23 +104,35 @@
         SDL_FreeAudioMem(this->hidden->mixbuf);
         this->hidden->mixbuf = NULL;
     }
+    SDL_free(this->hidden);
+    this->hidden = NULL;
 }
 
 static int
-DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
+DUMMYAUD_OpenAudio(_THIS, const char *devname, int iscapture)
 {
     float bytes_per_sec = 0.0f;
 
+    /* Initialize all variables that we clean on shutdown */
+    this->hidden = (struct SDL_PrivateAudioData *)
+                    SDL_malloc((sizeof *this->hidden));
+    if (this->hidden == NULL) {
+        SDL_OutOfMemory();
+        return 0;
+    }
+    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
+
     /* Allocate mixing buffer */
-    this->hidden->mixlen = spec->size;
+    this->hidden->mixlen = this->spec.size;
     this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
     if (this->hidden->mixbuf == NULL) {
-        return (-1);
+        DUMMYAUD_CloseAudio(this);
+        return 0;
     }
-    SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
+    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
 
-    bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
-                             spec->channels * spec->freq);
+    bytes_per_sec = (float) (SDL_AUDIO_BITSIZE(this->spec.format) / 8) *
+                             this->spec.channels * this->spec.freq;
 
     /*
      * We try to make this request more audio at the correct rate for
@@ -156,10 +143,10 @@
      */
     this->hidden->initial_calls = 2;
     this->hidden->write_delay =
-        (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
+        (Uint32) ((((float) this->spec.size) / bytes_per_sec) * 1000.0f);
 
     /* We're ready to rock and roll. :-) */
-    return (0);
+    return 1;
 }
 
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