view src/audio/macrom/SDL_romaudio.c @ 1295:c3e36ac8a94c

Date: Sun, 6 Mar 2005 17:06:20 +0100 From: Per Inge Mathisen Subject: [SDL] Fullscreen refresh on win32 Windows has a terrible default for fullscreen 3D apps of 60mhz refresh rate. This can be fixed by the user by going into his driver's control panel and forcing the refresh rate higher. However, this not a very user friendly way about it, and in any case SDL contains no code that could figure out this that condition has afflicted the user. So the question is, could SDL fix this for the user? It is possible under Windows to request a higher refresh rate. The danger is of course that if the user has an old monitor, and you request a too high refresh rate, the monitor could be damaged. However, I believe there might be a way around that: Check before switching what refresh rate the user's desktop runs in, and if our fullscreen dimensions are equal or less than those of the desktop, use the higher refresh rate of 60 and the desktop rate. Since most users run their desktops in the same or higher resolution something sane, this should fix this problem for most users. Thoughts? An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE) option so that programs can bitch at their users at their own convenience. - Per
author Sam Lantinga <slouken@libsdl.org>
date Mon, 30 Jan 2006 06:56:10 +0000
parents cf6133247d34
children c9b51268668f
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

#if defined(__APPLE__) && defined(__MACH__)
#  include <Carbon/Carbon.h>
#elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335)
#  include <Carbon.h>
#else
#  include <Sound.h> /* SoundManager interface */
#  include <Gestalt.h>
#  include <DriverServices.h>
#endif

#include <stdlib.h>
#include <stdio.h>

#if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335)
#if !defined(NewSndCallBackProc) /* avoid circular redefinition... */
#define NewSndCallBackUPP NewSndCallBackProc
#endif
#if !defined(NewSndCallBackUPP)
#define NewSndCallBackUPP NewSndCallBackProc
#endif
#endif

#include "SDL_endian.h"
#include "SDL_audio.h"
#include "SDL_audio_c.h"
#include "SDL_audiomem.h"
#include "SDL_sysaudio.h"
#include "SDL_romaudio.h"

/* Audio driver functions */

static void Mac_CloseAudio(_THIS);
static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void Mac_LockAudio(_THIS);
static void Mac_UnlockAudio(_THIS);

/* Audio driver bootstrap functions */


static int Audio_Available(void)
{
    return(1);
}

static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
    free(device->hidden);
    free(device);
}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
    SDL_AudioDevice *this;

    /* Initialize all variables that we clean on shutdown */
    this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
    if ( this ) {
        memset(this, 0, (sizeof *this));
        this->hidden = (struct SDL_PrivateAudioData *)
                malloc((sizeof *this->hidden));
    }
    if ( (this == NULL) || (this->hidden == NULL) ) {
        SDL_OutOfMemory();
        if ( this ) {
            free(this);
        }
        return(0);
    }
    memset(this->hidden, 0, (sizeof *this->hidden));

    /* Set the function pointers */
    this->OpenAudio   = Mac_OpenAudio;
    this->CloseAudio  = Mac_CloseAudio;
    this->LockAudio   = Mac_LockAudio;
    this->UnlockAudio = Mac_UnlockAudio;
    this->free        = Audio_DeleteDevice;

#ifdef MACOSX	/* MacOS X uses threaded audio, so normal thread code is okay */
    this->LockAudio   = NULL;
    this->UnlockAudio = NULL;
#endif
    return this;
}

AudioBootStrap SNDMGR_bootstrap = {
	"sndmgr", "MacOS SoundManager 3.0",
	Audio_Available, Audio_CreateDevice
};

#if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE)
/* This works correctly on MacOS X */

#pragma options align=power

static volatile SInt32 audio_is_locked = 0;
static volatile SInt32 need_to_mix = 0;

static UInt8  *buffer[2];
static volatile UInt32 running = 0;
static CmpSoundHeader header;
static volatile Uint32 fill_me = 0;

static void mix_buffer(SDL_AudioDevice *audio, UInt8 *buffer)
{
   if ( ! audio->paused ) {
#ifdef MACOSX
        SDL_mutexP(audio->mixer_lock);
#endif
        if ( audio->convert.needed ) {
            audio->spec.callback(audio->spec.userdata,
                    (Uint8 *)audio->convert.buf,audio->convert.len);
            SDL_ConvertAudio(&audio->convert);
            if ( audio->convert.len_cvt != audio->spec.size ) {
                /* Uh oh... probably crashes here */;
            }
            memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
        } else {
            audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
        }
#ifdef MACOSX
        SDL_mutexV(audio->mixer_lock);
#endif
    }

    DecrementAtomic((SInt32 *) &need_to_mix);
}

static void Mac_LockAudio(_THIS)
{
    IncrementAtomic((SInt32 *) &audio_is_locked);
}

static void Mac_UnlockAudio(_THIS)
{
    SInt32 oldval;
         
    oldval = DecrementAtomic((SInt32 *) &audio_is_locked);
    if ( oldval != 1 )  /* != 1 means audio is still locked. */
        return;

    /* Did we miss the chance to mix in an interrupt? Do it now. */
    if ( BitAndAtomic (0xFFFFFFFF, (UInt32 *) &need_to_mix) ) {
        /*
         * Note that this could be a problem if you missed an interrupt
         *  while the audio was locked, and get preempted by a second
         *  interrupt here, but that means you locked for way too long anyhow.
         */
        mix_buffer (this, buffer[fill_me]);
    }
}

static void callBackProc (SndChannel *chan, SndCommand *cmd_passed ) {
   UInt32 play_me;
   SndCommand cmd; 
   SDL_AudioDevice *audio = (SDL_AudioDevice *)chan->userInfo;

   IncrementAtomic((SInt32 *) &need_to_mix);

   fill_me = cmd_passed->param2;  /* buffer that has just finished playing, so fill it */      
   play_me = ! fill_me;           /* filled buffer to play _now_ */

   if ( ! audio->enabled ) {
      return;
   }
   
   /* queue previously mixed buffer for playback. */
   header.samplePtr = (Ptr)buffer[play_me];
   cmd.cmd = bufferCmd;
   cmd.param1 = 0; 
   cmd.param2 = (long)&header;
   SndDoCommand (chan, &cmd, 0);

   memset (buffer[fill_me], 0, audio->spec.size);

   /*
    * if audio device isn't locked, mix the next buffer to be queued in
    *  the memory block that just finished playing.
    */
   if ( ! BitAndAtomic(0xFFFFFFFF, (UInt32 *) &audio_is_locked) ) {
      mix_buffer (audio, buffer[fill_me]);
   } 

   /* set this callback to run again when current buffer drains. */
   if ( running ) {
      cmd.cmd = callBackCmd;
      cmd.param1 = 0;
      cmd.param2 = play_me;
   
      SndDoCommand (chan, &cmd, 0);
   }
}

static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) {

   SndCallBackUPP callback;
   int sample_bits;
   int i;
   long initOptions;
      
   /* Very few conversions are required, but... */
    switch (spec->format) {
        case AUDIO_S8:
        spec->format = AUDIO_U8;
        break;
        case AUDIO_U16LSB:
        spec->format = AUDIO_S16LSB;
        break;
        case AUDIO_U16MSB:
        spec->format = AUDIO_S16MSB;
        break;
    }
    SDL_CalculateAudioSpec(spec);
    
    /* initialize bufferCmd header */
    memset (&header, 0, sizeof(header));
    callback = (SndCallBackUPP) NewSndCallBackUPP (callBackProc);
    sample_bits = spec->size / spec->samples / spec->channels * 8;

#ifdef DEBUG_AUDIO
    fprintf(stderr,
	"Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n",
	spec->format, spec->channels, sample_bits, spec->freq);
#endif /* DEBUG_AUDIO */
    
    header.numChannels = spec->channels;
    header.sampleSize  = sample_bits;
    header.sampleRate  = spec->freq << 16;
    header.numFrames   = spec->samples;
    header.encode      = cmpSH;
    
    /* Note that we install the 16bitLittleEndian Converter if needed. */
    if ( spec->format == 0x8010 ) {
        header.compressionID = fixedCompression;
        header.format = k16BitLittleEndianFormat;
    }
    
    /* allocate 2 buffers */
    for (i=0; i<2; i++) {
       buffer[i] = (UInt8*)malloc (sizeof(UInt8) * spec->size);
      if (buffer[i] == NULL) {
         SDL_OutOfMemory();
         return (-1);
      }
     memset (buffer[i], 0, spec->size);
   }
   
   /* Create the sound manager channel */
    channel = (SndChannelPtr)malloc(sizeof(*channel));
    if ( channel == NULL ) {
        SDL_OutOfMemory();
        return(-1);
    }
    if ( spec->channels >= 2 ) {
        initOptions = initStereo;
    } else {
        initOptions = initMono;
    }
    channel->userInfo = (long)this;
    channel->qLength = 128;
    if ( SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr ) {
        SDL_SetError("Unable to create audio channel");
        free(channel);
        channel = NULL;
        return(-1);
    }
   
   /* start playback */
   {
      SndCommand cmd;
      cmd.cmd = callBackCmd;
      cmd.param2 = 0;
      running = 1;
      SndDoCommand (channel, &cmd, 0);
   }
   
   return 1;
}

static void Mac_CloseAudio(_THIS) {
   
   int i;
   
   running = 0;
   
   if (channel) {
      SndDisposeChannel (channel, true);
      channel = NULL;
   }
   
    for ( i=0; i<2; ++i ) {
        if ( buffer[i] ) {
            free(buffer[i]);
            buffer[i] = NULL;
        }
    }
}

#else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */

static void Mac_LockAudio(_THIS)
{
    /* no-op. */
}

static void Mac_UnlockAudio(_THIS)
{
    /* no-op. */
}


/* This function is called by Sound Manager when it has exhausted one of
   the buffers, so we'll zero it to silence and fill it with audio if
   we're not paused.
*/
static pascal
void sndDoubleBackProc (SndChannelPtr chan, SndDoubleBufferPtr newbuf)
{
    SDL_AudioDevice *audio = (SDL_AudioDevice *)newbuf->dbUserInfo[0];

    /* If audio is quitting, don't do anything */
    if ( ! audio->enabled ) {
        return;
    }
    memset (newbuf->dbSoundData, 0, audio->spec.size);
    newbuf->dbNumFrames = audio->spec.samples;
    if ( ! audio->paused ) {
        if ( audio->convert.needed ) {
            audio->spec.callback(audio->spec.userdata,
                (Uint8 *)audio->convert.buf,audio->convert.len);
            SDL_ConvertAudio(&audio->convert);
#if 0
            if ( audio->convert.len_cvt != audio->spec.size ) {
                /* Uh oh... probably crashes here */;
            }
#endif
            memcpy(newbuf->dbSoundData, audio->convert.buf,
                            audio->convert.len_cvt);
        } else {
            audio->spec.callback(audio->spec.userdata,
                (Uint8 *)newbuf->dbSoundData, audio->spec.size);
        }
    }
    newbuf->dbFlags    |= dbBufferReady;
}

static int DoubleBufferAudio_Available(void)
{
    int available;
    NumVersion sndversion;
    long response;

    available = 0;
    sndversion = SndSoundManagerVersion();
    if ( sndversion.majorRev >= 3 ) {
        if ( Gestalt(gestaltSoundAttr, &response) == noErr ) {
            if ( (response & (1 << gestaltSndPlayDoubleBuffer)) ) {
                available = 1;
            }
        }
    } else {
        if ( Gestalt(gestaltSoundAttr, &response) == noErr ) {
            if ( (response & (1 << gestaltHasASC)) ) {
                available = 1;
            }
        }
    }
    return(available);
}

static void Mac_CloseAudio(_THIS)
{
    int i;

    if ( channel != NULL ) {
        /* Clean up the audio channel */
        SndDisposeChannel(channel, true);
        channel = NULL;
    }
    for ( i=0; i<2; ++i ) {
        if ( audio_buf[i] ) {
            free(audio_buf[i]);
            audio_buf[i] = NULL;
        }
    }
}

static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
    SndDoubleBufferHeader2 audio_dbh;
    int i;
    long initOptions;
    int sample_bits;
    SndDoubleBackUPP doubleBackProc;

    /* Check to make sure double-buffered audio is available */
    if ( ! DoubleBufferAudio_Available() ) {
        SDL_SetError("Sound manager doesn't support double-buffering");
        return(-1);
    }

    /* Very few conversions are required, but... */
    switch (spec->format) {
        case AUDIO_S8:
        spec->format = AUDIO_U8;
        break;
        case AUDIO_U16LSB:
        spec->format = AUDIO_S16LSB;
        break;
        case AUDIO_U16MSB:
        spec->format = AUDIO_S16MSB;
        break;
    }
    SDL_CalculateAudioSpec(spec);

    /* initialize the double-back header */
    memset(&audio_dbh, 0, sizeof(audio_dbh));
    doubleBackProc = NewSndDoubleBackProc (sndDoubleBackProc);
    sample_bits = spec->size / spec->samples / spec->channels * 8;
    
    audio_dbh.dbhNumChannels = spec->channels;
    audio_dbh.dbhSampleSize    = sample_bits;
    audio_dbh.dbhCompressionID = 0;
    audio_dbh.dbhPacketSize    = 0;
    audio_dbh.dbhSampleRate    = spec->freq << 16;
    audio_dbh.dbhDoubleBack    = doubleBackProc;
    audio_dbh.dbhFormat    = 0;

    /* Note that we install the 16bitLittleEndian Converter if needed. */
    if ( spec->format == 0x8010 ) {
        audio_dbh.dbhCompressionID = fixedCompression;
        audio_dbh.dbhFormat = k16BitLittleEndianFormat;
    }

    /* allocate the 2 double-back buffers */
    for ( i=0; i<2; ++i ) {
        audio_buf[i] = calloc(1, sizeof(SndDoubleBuffer)+spec->size);
        if ( audio_buf[i] == NULL ) {
            SDL_OutOfMemory();
            return(-1);
        }
        audio_buf[i]->dbNumFrames = spec->samples;
        audio_buf[i]->dbFlags = dbBufferReady;
        audio_buf[i]->dbUserInfo[0] = (long)this;
        audio_dbh.dbhBufferPtr[i] = audio_buf[i];
    }

    /* Create the sound manager channel */
    channel = (SndChannelPtr)malloc(sizeof(*channel));
    if ( channel == NULL ) {
        SDL_OutOfMemory();
        return(-1);
    }
    if ( spec->channels >= 2 ) {
        initOptions = initStereo;
    } else {
        initOptions = initMono;
    }
    channel->userInfo = 0;
    channel->qLength = 128;
    if ( SndNewChannel(&channel, sampledSynth, initOptions, 0L) != noErr ) {
        SDL_SetError("Unable to create audio channel");
        free(channel);
        channel = NULL;
        return(-1);
    }
 
    /* Start playback */
    if ( SndPlayDoubleBuffer(channel, (SndDoubleBufferHeaderPtr)&audio_dbh)
                                != noErr ) {
        SDL_SetError("Unable to play double buffered audio");
        return(-1);
    }
    
    return 1;
}

#endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */