This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
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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#include "SDL_config.h"
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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 */
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static int AHI_OpenAudio(_THIS, SDL_AudioSpec * spec);
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static void AHI_WaitAudio(_THIS);
static void AHI_PlayAudio(_THIS);
static Uint8 *AHI_GetAudioBuf(_THIS);
static void AHI_CloseAudio(_THIS);
#ifndef __SASC
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#define mymalloc(x) AllocVec(x,MEMF_PUBLIC)
#define myfree FreeVec
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#else
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#define mymalloc malloc
#define myfree free
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#endif
/* Audio driver bootstrap functions */
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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;
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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}
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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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}
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static SDL_AudioDevice *
Audio_CreateDevice(int devindex)
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SDL_AudioDevice *this;
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#ifndef NO_AMIGADEBUG
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D(bug("AHI created...\n"));
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#endif
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/* Initialize all variables that we clean on shutdown */
this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
if (this) {
SDL_memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
}
if ((this == NULL) || (this->hidden == NULL)) {
SDL_OutOfMemory();
if (this) {
SDL_free(this);
}
return (0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
/* 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;
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}
AudioBootStrap AHI_bootstrap = {
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"AHI", Audio_Available, Audio_CreateDevice
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};
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void static
AHI_WaitAudio(_THIS)
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{
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if (!CheckIO((struct IORequest *) audio_req[current_buffer])) {
WaitIO((struct IORequest *) audio_req[current_buffer]);
// AbortIO((struct IORequest *)audio_req[current_buffer]);
}
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}
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static void
AHI_PlayAudio(_THIS)
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{
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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];
audio_req[current_buffer]->ahir_Std.io_Length = this->hidden->size;
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++;
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}
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static Uint8 *
AHI_GetAudioBuf(_THIS)
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{
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return (mixbuf[current_buffer]);
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}
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static void
AHI_CloseAudio(_THIS)
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{
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D(bug("Closing audio...\n"));
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playing = 0;
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if (audio_req[0]) {
if (audio_req[1]) {
D(bug("Break req[1]...\n"));
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AbortIO((struct IORequest *) audio_req[1]);
WaitIO((struct IORequest *) audio_req[1]);
}
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D(bug("Break req[0]...\n"));
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AbortIO((struct IORequest *) audio_req[0]);
WaitIO((struct IORequest *) audio_req[0]);
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if (audio_req[1]) {
D(bug("Break AGAIN req[1]...\n"));
AbortIO((struct IORequest *) audio_req[1]);
WaitIO((struct IORequest *) audio_req[1]);
}
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// Double abort to be sure to break the dbuffering process.
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SDL_Delay(200);
D(bug("Reqs breaked, closing device...\n"));
CloseDevice((struct IORequest *) audio_req[0]);
D(bug("Device closed, freeing memory...\n"));
myfree(audio_req[1]);
D(bug("Memory freed, deleting IOReq...\n"));
DeleteIORequest((struct IORequest *) audio_req[0]);
audio_req[0] = audio_req[1] = NULL;
}
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"));
if (audio_port != NULL) {
DeleteMsgPort(audio_port);
audio_port = NULL;
}
D(bug("...done!\n"));
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}
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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;
if (spec->channels < 2)
this->hidden->type = AHIST_M8S;
else
this->hidden->type = AHIST_S8S;
}
break;
case 16:
{ /* Signed 16 bit audio data */
D(bug("Samples a 16 bit...\n"));
spec->format = AUDIO_S16MSB;
this->hidden->bytespersample = 2;
if (spec->channels < 2)
this->hidden->type = AHIST_M16S;
else
this->hidden->type = AHIST_S16S;
}
break;
default:
{
SDL_SetError("Unsupported audio format");
return (-1);
}
}
if (spec->channels != 1 && spec->channels != 2) {
D(bug("Wrong channel number!\n"));
SDL_SetError("Channel number non supported");
return -1;
}
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"));
/* Set output frequency and size */
this->hidden->freq = spec->freq;
this->hidden->size = spec->size;
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"));
SDL_memcpy(audio_req[1], audio_req[0], sizeof(struct AHIRequest));
if (mixbuf[0] == NULL || mixbuf[1] == NULL) {
SDL_OutOfMemory();
return (-1);
}
D(bug("Before mixbuf memset\n"));
SDL_memset(mixbuf[0], spec->silence, spec->size);
SDL_memset(mixbuf[1], spec->silence, spec->size);
current_buffer = 0;
playing = 0;
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));
/* We're ready to rock and roll. :-) */
return (0);
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}
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/* vi: set ts=4 sw=4 expandtab: */