SDL_romaudio.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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#if defined(__APPLE__) && defined(__MACH__)
# include <Carbon/Carbon.h>
#elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335)
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# include <Carbon.h>
#else
# include <Sound.h> /* SoundManager interface */
# include <Gestalt.h>
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# include <DriverServices.h>
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#endif
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#if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335)
#if !defined(NewSndCallBackProc) /* avoid circular redefinition... */
#define NewSndCallBackUPP NewSndCallBackProc
#endif
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#if !defined(NewSndCallBackUPP)
#define NewSndCallBackUPP NewSndCallBackProc
#endif
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
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#include "SDL_romaudio.h"
/* Audio driver functions */
static void Mac_CloseAudio(_THIS);
static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec);
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static void Mac_LockAudio(_THIS);
static void Mac_UnlockAudio(_THIS);
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/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
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SDL_free(device->hidden);
SDL_free(device);
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}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
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this = (SDL_AudioDevice *)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 = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
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SDL_free(this);
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}
return(0);
}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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/* Set the function pointers */
this->OpenAudio = Mac_OpenAudio;
this->CloseAudio = Mac_CloseAudio;
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this->LockAudio = Mac_LockAudio;
this->UnlockAudio = Mac_UnlockAudio;
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this->free = Audio_DeleteDevice;
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#ifdef __MACOSX__ /* MacOS X uses threaded audio, so normal thread code is okay */
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this->LockAudio = NULL;
this->UnlockAudio = NULL;
#endif
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return this;
}
AudioBootStrap SNDMGR_bootstrap = {
"sndmgr", "MacOS SoundManager 3.0",
Audio_Available, Audio_CreateDevice
};
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#if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE)
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/* This works correctly on MacOS X */
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#pragma options align=power
static volatile SInt32 audio_is_locked = 0;
static volatile SInt32 need_to_mix = 0;
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static UInt8 *buffer[2];
static volatile UInt32 running = 0;
static CmpSoundHeader header;
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static volatile Uint32 fill_me = 0;
static void mix_buffer(SDL_AudioDevice *audio, UInt8 *buffer)
{
if ( ! audio->paused ) {
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#ifdef __MACOSX__
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SDL_mutexP(audio->mixer_lock);
#endif
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if ( audio->convert.needed ) {
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audio->spec.callback(audio->spec.userdata,
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(Uint8 *)audio->convert.buf,audio->convert.len);
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SDL_ConvertAudio(&audio->convert);
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if ( audio->convert.len_cvt != audio->spec.size ) {
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/* Uh oh... probably crashes here */;
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SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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} else {
audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size);
}
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#ifdef __MACOSX__
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SDL_mutexV(audio->mixer_lock);
#endif
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}
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. */
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if ( BitAndAtomic (0xFFFFFFFF, (UInt32 *) &need_to_mix) ) {
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/*
* 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]);
}
}
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static void callBackProc (SndChannel *chan, SndCommand *cmd_passed ) {
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UInt32 play_me;
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SndCommand cmd;
SDL_AudioDevice *audio = (SDL_AudioDevice *)chan->userInfo;
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IncrementAtomic((SInt32 *) &need_to_mix);
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fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */
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play_me = ! fill_me; /* filled buffer to play _now_ */
if ( ! audio->enabled ) {
return;
}
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/* queue previously mixed buffer for playback. */
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header.samplePtr = (Ptr)buffer[play_me];
cmd.cmd = bufferCmd;
cmd.param1 = 0;
cmd.param2 = (long)&header;
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SndDoCommand (chan, &cmd, 0);
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memset (buffer[fill_me], 0, audio->spec.size);
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/*
* if audio device isn't locked, mix the next buffer to be queued in
* the memory block that just finished playing.
*/
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if ( ! BitAndAtomic(0xFFFFFFFF, (UInt32 *) &audio_is_locked) ) {
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mix_buffer (audio, buffer[fill_me]);
}
/* set this callback to run again when current buffer drains. */
if ( running ) {
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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;
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/* 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));
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callback = (SndCallBackUPP) NewSndCallBackUPP (callBackProc);
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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 */
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channel = (SndChannelPtr)SDL_malloc(sizeof(*channel));
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if ( channel == NULL ) {
SDL_OutOfMemory();
return(-1);
}
if ( spec->channels >= 2 ) {
initOptions = initStereo;
} else {
initOptions = initMono;
}
channel->userInfo = (long)this;
channel->qLength = 128;
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if ( SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr ) {
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SDL_SetError("Unable to create audio channel");
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SDL_free(channel);
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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] ) {
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SDL_free(buffer[i]);
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buffer[i] = NULL;
}
}
}
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#else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */
static void Mac_LockAudio(_THIS)
{
/* no-op. */
}
static void Mac_UnlockAudio(_THIS)
{
/* no-op. */
}
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/* 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
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SDL_memcpy(newbuf->dbSoundData, audio->convert.buf,
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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] ) {
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SDL_free(audio_buf[i]);
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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 */
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SDL_memset(&audio_dbh, 0, sizeof(audio_dbh));
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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 ) {
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audio_buf[i] = SDL_calloc(1, sizeof(SndDoubleBuffer)+spec->size);
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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 */
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channel = (SndChannelPtr)SDL_malloc(sizeof(*channel));
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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");
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SDL_free(channel);
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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;
}
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#endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */