src/audio/mme/SDL_mmeaudio.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 01 Sep 2006 06:43:41 +0000
changeset 2006 b3741f227757
parent 1895 c121d94672cb
child 2049 5f6550e5184f
child 3798 c8b3d3d13ed1
permissions -rw-r--r--
Updated Tru64 audio to support int32.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Tru64 UNIX MME support */
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#include <mme_api.h>
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_mmeaudio.h"
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static BOOL inUse[NUM_BUFFERS];
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/* Audio driver functions */
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static int MME_OpenAudio(_THIS, SDL_AudioSpec * spec);
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static void MME_WaitAudio(_THIS);
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static Uint8 *MME_GetAudioBuf(_THIS);
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static void MME_PlayAudio(_THIS);
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static void MME_WaitDone(_THIS);
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static void MME_CloseAudio(_THIS);
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/* Audio driver bootstrap functions */
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static int
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Audio_Available(void)
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{
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    return (1);
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}
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static void
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Audio_DeleteDevice(SDL_AudioDevice * device)
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{
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    if (device) {
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        if (device->hidden) {
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            SDL_free(device->hidden);
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            device->hidden = NULL;
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        }
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        SDL_free(device);
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        device = NULL;
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    }
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}
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static SDL_AudioDevice *
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Audio_CreateDevice(int devindex)
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{
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    SDL_AudioDevice *this;
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/* Initialize all variables that we clean on shutdown */
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    this = SDL_malloc(sizeof(SDL_AudioDevice));
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    if (this) {
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        SDL_memset(this, 0, (sizeof *this));
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        this->hidden = SDL_malloc((sizeof *this->hidden));
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    }
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    if ((this == NULL) || (this->hidden == NULL)) {
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        SDL_OutOfMemory();
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        if (this) {
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            SDL_free(this);
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        }
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        return (0);
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    }
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    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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    /* Set the function pointers */
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    this->OpenAudio = MME_OpenAudio;
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    this->WaitAudio = MME_WaitAudio;
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    this->PlayAudio = MME_PlayAudio;
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    this->GetAudioBuf = MME_GetAudioBuf;
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    this->WaitDone = MME_WaitDone;
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    this->CloseAudio = MME_CloseAudio;
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    this->free = Audio_DeleteDevice;
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    return this;
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}
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AudioBootStrap MMEAUDIO_bootstrap = {
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    "waveout", "Tru64 MME WaveOut",
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    Audio_Available, Audio_CreateDevice
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};
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static void
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SetMMerror(char *function, MMRESULT code)
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{
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    int len;
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    char errbuf[MAXERRORLENGTH];
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    SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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    len = SDL_strlen(errbuf);
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    waveOutGetErrorText(code, errbuf + len, MAXERRORLENGTH - len);
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    SDL_SetError("%s", errbuf);
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}
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static void CALLBACK
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MME_CALLBACK(HWAVEOUT hwo,
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             UINT uMsg, DWORD dwInstance, LPARAM dwParam1, LPARAM dwParam2)
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{
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    WAVEHDR *wp = (WAVEHDR *) dwParam1;
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    if (uMsg == WOM_DONE)
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        inUse[wp->dwUser] = FALSE;
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}
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static int
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MME_OpenAudio(_THIS, SDL_AudioSpec * spec)
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{
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   123
    MMRESULT result;
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   124
    int i;
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   125
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    mixbuf = NULL;
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    /* Set basic WAVE format parameters */
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    shm = mmeAllocMem(sizeof(*shm));
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    if (shm == NULL) {
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        SDL_SetError("Out of memory: shm");
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        return (-1);
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   133
    }
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    shm->sound = 0;
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   135
    shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM;
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   136
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   137
    /* Determine the audio parameters from the AudioSpec */
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   138
    switch (SDL_AUDIO_BITSIZE(spec->format)) {
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    case 8:
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        /* Unsigned 8 bit audio data */
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        spec->format = AUDIO_U8;
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        shm->wFmt.wBitsPerSample = 8;
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   143
        break;
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   144
    case 16:
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   145
        /* Signed 16 bit audio data */
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        spec->format = AUDIO_S16;
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        shm->wFmt.wBitsPerSample = 16;
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   148
        break;
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   149
    case 32:
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        /* Signed 32 bit audio data */
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        spec->format = AUDIO_S32;
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        shm->wFmt.wBitsPerSample = 32;
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   153
        break;
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   154
    default:
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        SDL_SetError("Unsupported audio format");
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        return (-1);
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   157
    }
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   158
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   159
    /* !!! FIXME: Can this handle more than stereo? */
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   160
    shm->wFmt.wf.nChannels = spec->channels;
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   161
    shm->wFmt.wf.nSamplesPerSec = spec->freq;
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   162
    shm->wFmt.wf.nBlockAlign =
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        shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
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   164
    shm->wFmt.wf.nAvgBytesPerSec =
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   165
        shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign;
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   166
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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   167
    /* Check the buffer size -- minimum of 1/4 second (word aligned) */
1895
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   168
    if (spec->samples < (spec->freq / 4))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   169
        spec->samples = ((spec->freq / 4) + 3) & ~3;
654
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   170
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diff changeset
   171
    /* Update the fragment size as size in bytes */
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parents:
diff changeset
   172
    SDL_CalculateAudioSpec(spec);
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   173
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   174
    /* Open the audio device */
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   175
    result = waveOutOpen(&(shm->sound),
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   176
                         WAVE_MAPPER,
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   177
                         &(shm->wFmt.wf),
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   178
                         MME_CALLBACK,
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   179
                         NULL, (CALLBACK_FUNCTION | WAVE_OPEN_SHAREABLE));
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   180
    if (result != MMSYSERR_NOERROR) {
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   181
        SetMMerror("waveOutOpen()", result);
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   182
        return (-1);
654
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   183
    }
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   184
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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   185
    /* Create the sound buffers */
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   186
    mixbuf = (Uint8 *) mmeAllocBuffer(NUM_BUFFERS * (spec->size));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   187
    if (mixbuf == NULL) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   188
        SDL_SetError("Out of memory: mixbuf");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   189
        return (-1);
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diff changeset
   190
    }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
   191
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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   192
    for (i = 0; i < NUM_BUFFERS; i++) {
1895
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   193
        shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   194
        shm->wHdr[i].dwBufferLength = spec->size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   195
        shm->wHdr[i].dwFlags = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   196
        shm->wHdr[i].dwUser = i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   197
        shm->wHdr[i].dwLoops = 0;       /* loop control counter */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   198
        shm->wHdr[i].lpNext = NULL;     /* reserved for driver */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   199
        shm->wHdr[i].reserved = 0;
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   200
        inUse[i] = FALSE;
654
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diff changeset
   201
    }
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
   202
    next_buffer = 0;
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diff changeset
   203
    return 0;
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
   204
}
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   205
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   206
static void
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   207
MME_WaitAudio(_THIS)
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   208
{
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   209
    while (inUse[next_buffer]) {
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   210
        mmeWaitForCallbacks();
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   211
        mmeProcessCallbacks();
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   212
    }
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   213
}
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   214
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   215
static Uint8 *
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   216
MME_GetAudioBuf(_THIS)
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   217
{
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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   218
    Uint8 *retval;
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   219
e92bcf2573cb Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
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diff changeset
   220
    inUse[next_buffer] = TRUE;
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   221
    retval = (Uint8 *) (shm->wHdr[next_buffer].lpData);
654
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   222
    return retval;
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diff changeset
   223
}
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diff changeset
   224
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   225
static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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   226
MME_PlayAudio(_THIS)
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   227
{
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   228
    /* Queue it up */
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   229
    waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
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   230
    next_buffer = (next_buffer + 1) % NUM_BUFFERS;
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   231
}
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diff changeset
   232
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   233
static void
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   234
MME_WaitDone(_THIS)
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   235
{
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   236
    MMRESULT result;
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   237
    int i;
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diff changeset
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    if (shm->sound) {
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        for (i = 0; i < NUM_BUFFERS; i++)
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            while (inUse[i]) {
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                mmeWaitForCallbacks();
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                mmeProcessCallbacks();
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            }
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        result = waveOutReset(shm->sound);
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        if (result != MMSYSERR_NOERROR)
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            SetMMerror("waveOutReset()", result);
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        mmeProcessCallbacks();
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    }
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}
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static void
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MME_CloseAudio(_THIS)
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{
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    MMRESULT result;
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    if (mixbuf) {
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        result = mmeFreeBuffer(mixbuf);
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        if (result != MMSYSERR_NOERROR)
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            SetMMerror("mmeFreeBuffer", result);
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        mixbuf = NULL;
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    }
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    if (shm) {
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        if (shm->sound) {
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            result = waveOutClose(shm->sound);
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            if (result != MMSYSERR_NOERROR)
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                SetMMerror("waveOutClose()", result);
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            mmeProcessCallbacks();
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        }
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        result = mmeFreeMem(shm);
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        if (result != MMSYSERR_NOERROR)
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            SetMMerror("mmeFreeMem()", result);
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        shm = NULL;
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    }
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}
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/* vi: set ts=4 sw=4 expandtab: */