src/audio/dummy/SDL_dummyaudio.c
changeset 2049 5f6550e5184f
parent 1895 c121d94672cb
child 2060 866052b01ee5
     1.1 --- a/src/audio/dummy/SDL_dummyaudio.c	Sun Oct 01 16:10:41 2006 +0000
     1.2 +++ b/src/audio/dummy/SDL_dummyaudio.c	Tue Oct 17 09:15:21 2006 +0000
     1.3 @@ -25,141 +25,27 @@
     1.4  
     1.5  /* Output audio to nowhere... */
     1.6  
     1.7 -#include "SDL_rwops.h"
     1.8 -#include "SDL_timer.h"
     1.9  #include "SDL_audio.h"
    1.10 -#include "../SDL_audiomem.h"
    1.11  #include "../SDL_audio_c.h"
    1.12 -#include "../SDL_audiodev_c.h"
    1.13  #include "SDL_dummyaudio.h"
    1.14  
    1.15 -/* The tag name used by DUMMY audio */
    1.16 -#define DUMMYAUD_DRIVER_NAME         "dummy"
    1.17 -
    1.18 -/* Audio driver functions */
    1.19 -static int DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec);
    1.20 -static void DUMMYAUD_WaitAudio(_THIS);
    1.21 -static void DUMMYAUD_PlayAudio(_THIS);
    1.22 -static Uint8 *DUMMYAUD_GetAudioBuf(_THIS);
    1.23 -static void DUMMYAUD_CloseAudio(_THIS);
    1.24 -
    1.25 -/* Audio driver bootstrap functions */
    1.26  static int
    1.27 -DUMMYAUD_Available(void)
    1.28 +DUMMYAUD_OpenDevice(_THIS, const char *devname, int iscapture)
    1.29  {
    1.30 -    const char *envr = SDL_getenv("SDL_AUDIODRIVER");
    1.31 -    if (envr && (SDL_strcmp(envr, DUMMYAUD_DRIVER_NAME) == 0)) {
    1.32 -        return (1);
    1.33 -    }
    1.34 -    return (0);
    1.35 +    return 1;   /* always succeeds. */
    1.36  }
    1.37  
    1.38 -static void
    1.39 -DUMMYAUD_DeleteDevice(SDL_AudioDevice * device)
    1.40 -{
    1.41 -    SDL_free(device->hidden);
    1.42 -    SDL_free(device);
    1.43 -}
    1.44 -
    1.45 -static SDL_AudioDevice *
    1.46 -DUMMYAUD_CreateDevice(int devindex)
    1.47 +static int
    1.48 +DUMMYAUD_Init(SDL_AudioDriverImpl *impl)
    1.49  {
    1.50 -    SDL_AudioDevice *this;
    1.51 -
    1.52 -    /* Initialize all variables that we clean on shutdown */
    1.53 -    this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
    1.54 -    if (this) {
    1.55 -        SDL_memset(this, 0, (sizeof *this));
    1.56 -        this->hidden = (struct SDL_PrivateAudioData *)
    1.57 -            SDL_malloc((sizeof *this->hidden));
    1.58 -    }
    1.59 -    if ((this == NULL) || (this->hidden == NULL)) {
    1.60 -        SDL_OutOfMemory();
    1.61 -        if (this) {
    1.62 -            SDL_free(this);
    1.63 -        }
    1.64 -        return (0);
    1.65 -    }
    1.66 -    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
    1.67 -
    1.68      /* Set the function pointers */
    1.69 -    this->OpenAudio = DUMMYAUD_OpenAudio;
    1.70 -    this->WaitAudio = DUMMYAUD_WaitAudio;
    1.71 -    this->PlayAudio = DUMMYAUD_PlayAudio;
    1.72 -    this->GetAudioBuf = DUMMYAUD_GetAudioBuf;
    1.73 -    this->CloseAudio = DUMMYAUD_CloseAudio;
    1.74 -
    1.75 -    this->free = DUMMYAUD_DeleteDevice;
    1.76 -
    1.77 -    return this;
    1.78 +    impl->OpenDevice = DUMMYAUD_OpenDevice;
    1.79 +    impl->OnlyHasDefaultOutputDevice = 1;
    1.80 +    return 1;
    1.81  }
    1.82  
    1.83  AudioBootStrap DUMMYAUD_bootstrap = {
    1.84 -    DUMMYAUD_DRIVER_NAME, "SDL dummy audio driver",
    1.85 -    DUMMYAUD_Available, DUMMYAUD_CreateDevice
    1.86 +    "dummy", "SDL dummy audio driver", DUMMYAUD_Init, 1
    1.87  };
    1.88  
    1.89 -/* This function waits until it is possible to write a full sound buffer */
    1.90 -static void
    1.91 -DUMMYAUD_WaitAudio(_THIS)
    1.92 -{
    1.93 -    /* Don't block on first calls to simulate initial fragment filling. */
    1.94 -    if (this->hidden->initial_calls)
    1.95 -        this->hidden->initial_calls--;
    1.96 -    else
    1.97 -        SDL_Delay(this->hidden->write_delay);
    1.98 -}
    1.99 -
   1.100 -static void
   1.101 -DUMMYAUD_PlayAudio(_THIS)
   1.102 -{
   1.103 -    /* no-op...this is a null driver. */
   1.104 -}
   1.105 -
   1.106 -static Uint8 *
   1.107 -DUMMYAUD_GetAudioBuf(_THIS)
   1.108 -{
   1.109 -    return (this->hidden->mixbuf);
   1.110 -}
   1.111 -
   1.112 -static void
   1.113 -DUMMYAUD_CloseAudio(_THIS)
   1.114 -{
   1.115 -    if (this->hidden->mixbuf != NULL) {
   1.116 -        SDL_FreeAudioMem(this->hidden->mixbuf);
   1.117 -        this->hidden->mixbuf = NULL;
   1.118 -    }
   1.119 -}
   1.120 -
   1.121 -static int
   1.122 -DUMMYAUD_OpenAudio(_THIS, SDL_AudioSpec * spec)
   1.123 -{
   1.124 -    float bytes_per_sec = 0.0f;
   1.125 -
   1.126 -    /* Allocate mixing buffer */
   1.127 -    this->hidden->mixlen = spec->size;
   1.128 -    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
   1.129 -    if (this->hidden->mixbuf == NULL) {
   1.130 -        return (-1);
   1.131 -    }
   1.132 -    SDL_memset(this->hidden->mixbuf, spec->silence, spec->size);
   1.133 -
   1.134 -    bytes_per_sec = (float) (((spec->format & 0xFF) / 8) *
   1.135 -                             spec->channels * spec->freq);
   1.136 -
   1.137 -    /*
   1.138 -     * We try to make this request more audio at the correct rate for
   1.139 -     *  a given audio spec, so timing stays fairly faithful.
   1.140 -     * Also, we have it not block at all for the first two calls, so
   1.141 -     *  it seems like we're filling two audio fragments right out of the
   1.142 -     *  gate, like other SDL drivers tend to do.
   1.143 -     */
   1.144 -    this->hidden->initial_calls = 2;
   1.145 -    this->hidden->write_delay =
   1.146 -        (Uint32) ((((float) spec->size) / bytes_per_sec) * 1000.0f);
   1.147 -
   1.148 -    /* We're ready to rock and roll. :-) */
   1.149 -    return (0);
   1.150 -}
   1.151 -
   1.152  /* vi: set ts=4 sw=4 expandtab: */