SDL_ahiaudio.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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/* Allow access to a raw mixing buffer (for AmigaOS) */
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_ahiaudio.h"
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/* Audio driver functions */
static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void AHI_WaitAudio(_THIS);
static void AHI_PlayAudio(_THIS);
static Uint8 *AHI_GetAudioBuf(_THIS);
static void AHI_CloseAudio(_THIS);
#ifndef __SASC
#define mymalloc(x) AllocVec(x,MEMF_PUBLIC)
#define myfree FreeVec
#else
#define mymalloc malloc
#define myfree free
#endif
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
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int ok=0;
struct MsgPort *p;
struct AHIRequest *req;
if(p=CreateMsgPort())
{
if(req=(struct AHIRequest *)CreateIORequest(p,sizeof(struct AHIRequest)))
{
req->ahir_Version=4;
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if(!OpenDevice(AHINAME,0,(struct IORequest *)req,NULL))
{
D(bug("AHI available.\n"));
ok=1;
CloseDevice((struct IORequest *)req);
}
DeleteIORequest((struct IORequest *)req);
}
DeleteMsgPort(p);
}
D(if(!ok) bug("AHI not available\n"));
return ok;
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}
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;
#ifndef NO_AMIGADEBUG
D(bug("AHI created...\n"));
#endif
/* 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 = AHI_OpenAudio;
this->WaitAudio = AHI_WaitAudio;
this->PlayAudio = AHI_PlayAudio;
this->GetAudioBuf = AHI_GetAudioBuf;
this->CloseAudio = AHI_CloseAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap AHI_bootstrap = {
"AHI", Audio_Available, Audio_CreateDevice
};
void static AHI_WaitAudio(_THIS)
{
if(!CheckIO((struct IORequest *)audio_req[current_buffer]))
{
WaitIO((struct IORequest *)audio_req[current_buffer]);
// AbortIO((struct IORequest *)audio_req[current_buffer]);
}
}
static void AHI_PlayAudio(_THIS)
{
if(playing>1)
WaitIO((struct IORequest *)audio_req[current_buffer]);
/* Write the audio data out */
audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60;
audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer];
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audio_req[current_buffer] -> ahir_Std. io_Length = this->hidden->size;
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audio_req[current_buffer] -> ahir_Std. io_Offset = 0;
audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE;
audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq;
audio_req[current_buffer] -> ahir_Volume = 0x10000;
audio_req[current_buffer] -> ahir_Type = this->hidden->type;
audio_req[current_buffer] -> ahir_Position = 0x8000;
audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL);
SendIO((struct IORequest *)audio_req[current_buffer]);
current_buffer^=1;
playing++;
}
static Uint8 *AHI_GetAudioBuf(_THIS)
{
return(mixbuf[current_buffer]);
}
static void AHI_CloseAudio(_THIS)
{
D(bug("Closing audio...\n"));
playing=0;
if(audio_req[0])
{
if(audio_req[1])
{
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D(bug("Break req[1]...\n"));
AbortIO((struct IORequest *)audio_req[1]);
WaitIO((struct IORequest *)audio_req[1]);
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}
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D(bug("Break req[0]...\n"));
AbortIO((struct IORequest *)audio_req[0]);
WaitIO((struct IORequest *)audio_req[0]);
if(audio_req[1])
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{
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D(bug("Break AGAIN req[1]...\n"));
AbortIO((struct IORequest *)audio_req[1]);
WaitIO((struct IORequest *)audio_req[1]);
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}
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// Double abort to be sure to break the dbuffering process.
SDL_Delay(200);
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D(bug("Reqs breaked, closing device...\n"));
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CloseDevice((struct IORequest *)audio_req[0]);
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D(bug("Device closed, freeing memory...\n"));
myfree(audio_req[1]);
D(bug("Memory freed, deleting IOReq...\n"));
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DeleteIORequest((struct IORequest *)audio_req[0]);
audio_req[0]=audio_req[1]=NULL;
}
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D(bug("Freeing mixbuf[0]...\n"));
if ( mixbuf[0] != NULL ) {
myfree(mixbuf[0]);
// SDL_FreeAudioMem(mixbuf[0]);
mixbuf[0] = NULL;
}
D(bug("Freeing mixbuf[1]...\n"));
if ( mixbuf[1] != NULL ) {
myfree(mixbuf[1]);
// SDL_FreeAudioMem(mixbuf[1]);
mixbuf[1] = NULL;
}
D(bug("Freeing audio_port...\n"));
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if ( audio_port != NULL ) {
DeleteMsgPort(audio_port);
audio_port = NULL;
}
D(bug("...done!\n"));
}
static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
// int width;
D(bug("AHI opening...\n"));
/* Determine the audio parameters from the AudioSpec */
switch ( spec->format & 0xFF ) {
case 8: { /* Signed 8 bit audio data */
D(bug("Samples a 8 bit...\n"));
spec->format = AUDIO_S8;
this->hidden->bytespersample=1;
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if(spec->channels<2)
this->hidden->type = AHIST_M8S;
else
this->hidden->type = AHIST_S8S;
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}
break;
case 16: { /* Signed 16 bit audio data */
D(bug("Samples a 16 bit...\n"));
spec->format = AUDIO_S16MSB;
this->hidden->bytespersample=2;
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if(spec->channels<2)
this->hidden->type = AHIST_M16S;
else
this->hidden->type = AHIST_S16S;
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}
break;
default: {
SDL_SetError("Unsupported audio format");
return(-1);
}
}
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if(spec->channels!=1 && spec->channels!=2)
{
D(bug("Wrong channel number!\n"));
SDL_SetError("Channel number non supported");
return -1;
}
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D(bug("Before CalculateAudioSpec\n"));
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(spec);
D(bug("Before CreateMsgPort\n"));
if(!(audio_port=CreateMsgPort()))
{
SDL_SetError("Unable to create a MsgPort");
return -1;
}
D(bug("Before CreateIORequest\n"));
if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest))))
{
SDL_SetError("Unable to create an AHIRequest");
DeleteMsgPort(audio_port);
return -1;
}
audio_req[0]->ahir_Version = 4;
if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL))
{
SDL_SetError("Unable to open AHI device!\n");
DeleteIORequest((struct IORequest *)audio_req[0]);
DeleteMsgPort(audio_port);
return -1;
}
D(bug("AFTER opendevice\n"));
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/* Set output frequency and size */
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this->hidden->freq = spec->freq;
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this->hidden->size = spec->size;
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D(bug("Before buffer allocation\n"));
/* Allocate mixing buffer */
mixbuf[0] = (Uint8 *)mymalloc(spec->size);
mixbuf[1] = (Uint8 *)mymalloc(spec->size);
D(bug("Before audio_req allocation\n"));
if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest))))
{
SDL_OutOfMemory();
return(-1);
}
D(bug("Before audio_req memcpy\n"));
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SDL_memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest));
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if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) {
SDL_OutOfMemory();
return(-1);
}
D(bug("Before mixbuf memset\n"));
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SDL_memset(mixbuf[0], spec->silence, spec->size);
SDL_memset(mixbuf[1], spec->silence, spec->size);
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current_buffer=0;
playing=0;
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D(bug("AHI opened: freq:%ld mixbuf:%lx/%lx buflen:%ld bits:%ld channels:%ld\n",spec->freq,mixbuf[0],mixbuf[1],spec->size,this->hidden->bytespersample*8,spec->channels));
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/* We're ready to rock and roll. :-) */
return(0);
}