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Added initial support for RISC OS (thanks Peter Naulls!)
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## Makefile.am for SDL using the RISC OS audio system | ||
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noinst_LTLIBRARIES = libaudio_riscos.la | ||
libaudio_riscos_la_SOURCES = $(SRCS) | ||
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# The SDL audio driver sources | ||
SRCS = SDL_drenderer.c \ | ||
SDL_drenderer.h |
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/* | ||
SDL - Simple DirectMedia Layer | ||
Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com | ||
*/ | ||
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#include <stdlib.h> | ||
#include <stdio.h> | ||
#include <memory.h> | ||
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#include <kernel.h> | ||
#include "swis.h" | ||
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#include "SDL_endian.h" | ||
#include "SDL_audio.h" | ||
#include "SDL_audio_c.h" | ||
#include "SDL_audiomem.h" | ||
#include "SDL_sysaudio.h" | ||
#include "SDL_drenderer.h" | ||
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#define DigitalRenderer_Activate 0x4F700 | ||
#define DigitalRenderer_Deactivate 0x4F701 | ||
#define DigitalRenderer_ReadState 0x4F705 | ||
#define DigitalRenderer_NewSample 0x4F706 | ||
#define DigitalRenderer_NumBuffers 0x4F709 | ||
#define DigitalRenderer_StreamSamples 0x4F70A | ||
#define DigitalRenderer_Stream16BitSamples 0x4F70B | ||
#define DigitalRenderer_StreamStatistics 0x4F70C | ||
#define DigitalRenderer_StreamFlags 0x4F70D | ||
#define DigitalRenderer_Activate16 0x4F70F | ||
#define DigitalRenderer_GetFrequency 0x4F710 | ||
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static int FillBuffer; | ||
extern SDL_AudioDevice *current_audio; | ||
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extern int riscos_audiobuffer; /* Override for audio buffer size */ | ||
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/* Audio driver functions */ | ||
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static void DRenderer_CloseAudio(_THIS); | ||
static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec); | ||
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/* Audio driver bootstrap functions */ | ||
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/* Define following to dump stats to stdout */ | ||
/* #define DUMP_AUDIO */ | ||
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static int Audio_Available(void) | ||
{ | ||
_kernel_swi_regs regs; | ||
int available = 0; | ||
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/* Use call to set buffers to also check if Module is loaded */ | ||
regs.r[0] = 0; | ||
if (_kernel_swi(DigitalRenderer_NumBuffers, ®s, ®s) == 0) available = 1; | ||
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return(available); | ||
} | ||
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static void Audio_DeleteDevice(SDL_AudioDevice *device) | ||
{ | ||
free(device->hidden); | ||
free(device); | ||
} | ||
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static SDL_AudioDevice *Audio_CreateDevice(int devindex) | ||
{ | ||
SDL_AudioDevice *this; | ||
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/* 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)); | ||
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/* Set the function pointers */ | ||
this->OpenAudio = DRenderer_OpenAudio; | ||
this->CloseAudio = DRenderer_CloseAudio; | ||
this->free = Audio_DeleteDevice; | ||
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return this; | ||
} | ||
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AudioBootStrap DRENDERER_bootstrap = { | ||
"drenderer", "RiscOS Digital Renderer Module", | ||
Audio_Available, Audio_CreateDevice | ||
}; | ||
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/* Routine called to check and fill audio buffers if necessary */ | ||
static Uint8 *buffer = NULL; | ||
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void DRenderer_FillBuffers() | ||
{ | ||
SDL_AudioDevice *audio = current_audio; | ||
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if ( !audio || ! audio->enabled ) | ||
{ | ||
return; | ||
} | ||
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if ( ! audio->paused ) | ||
{ | ||
_kernel_swi_regs regs; | ||
/* Check filled buffers count */ | ||
_kernel_swi(DigitalRenderer_StreamStatistics, ®s, ®s); | ||
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#ifdef DUMP_AUDIO | ||
if (regs.r[0] <= FillBuffer) | ||
{ | ||
printf("Buffers in use %d\n", regs.r[0]); | ||
} | ||
#endif | ||
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while (regs.r[0] <= FillBuffer && !audio->paused) | ||
{ | ||
if ( audio->convert.needed ) | ||
{ | ||
int silence; | ||
if ( audio->convert.src_format == AUDIO_U8 ) | ||
{ | ||
silence = 0x80; | ||
} else { | ||
silence = 0; | ||
} | ||
memset(audio->convert.buf, silence, audio->convert.len); | ||
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 | ||
regs.r[0] = (int)audio->convert.buf; | ||
regs.r[1] = audio->spec.samples * audio->spec.channels; | ||
_kernel_swi(DigitalRenderer_Stream16BitSamples, ®s, ®s); | ||
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} else | ||
{ | ||
/* Fill buffer with silence */ | ||
memset (buffer, 0, audio->spec.size); | ||
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audio->spec.callback(audio->spec.userdata, | ||
(Uint8 *)buffer, audio->spec.size); | ||
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regs.r[0] = (int)buffer; | ||
regs.r[1] = audio->spec.samples * audio->spec.channels; | ||
_kernel_swi(DigitalRenderer_Stream16BitSamples, ®s, ®s); | ||
} | ||
/* Check if we have enough buffers yet */ | ||
_kernel_swi(DigitalRenderer_StreamStatistics, ®s, ®s); | ||
} | ||
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} | ||
} | ||
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/* Size of DMA buffer to use */ | ||
#define DRENDERER_BUFFER_SIZE 512 | ||
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/* Number of centiseconds of sound to buffer. | ||
Hopefully more than the maximum time between calls to the | ||
FillBuffers routine above | ||
*/ | ||
#define DRENDERER_CSEC_TO_BUFFER 10 | ||
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static int DRenderer_OpenAudio(_THIS, SDL_AudioSpec *spec) | ||
{ | ||
_kernel_swi_regs regs; | ||
int buffers_per_sample; | ||
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#ifdef DUMP_AUDIO | ||
printf("Request format %d\n", spec->format); | ||
printf("Request freq %d\n", spec->freq); | ||
printf("Samples %d\n", spec->samples); | ||
#endif | ||
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/* Only support signed 16bit format */ | ||
spec->format = AUDIO_S16LSB; | ||
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if (spec->samples < DRENDERER_BUFFER_SIZE) spec->samples = DRENDERER_BUFFER_SIZE; | ||
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SDL_CalculateAudioSpec(spec); | ||
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buffers_per_sample = spec->samples / DRENDERER_BUFFER_SIZE; | ||
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if ((spec->samples % DRENDERER_BUFFER_SIZE) != 0) | ||
{ | ||
buffers_per_sample++; | ||
spec->samples = buffers_per_sample * DRENDERER_BUFFER_SIZE; | ||
} | ||
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/* Set number of buffers to use - the following should give enough | ||
data between calls to the sound polling. | ||
*/ | ||
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if (riscos_audiobuffer == 0) | ||
{ | ||
FillBuffer = (int)((double)DRENDERER_CSEC_TO_BUFFER / ((double)DRENDERER_BUFFER_SIZE * 100.0 / (double)spec->freq)) + 1; | ||
} else FillBuffer = riscos_audiobuffer/DRENDERER_BUFFER_SIZE - buffers_per_sample; | ||
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if (FillBuffer < buffers_per_sample) FillBuffer = buffers_per_sample; | ||
regs.r[0] = FillBuffer + buffers_per_sample; | ||
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#ifdef DUMP_AUDIO | ||
printf("Buffers per sample %d\n", buffers_per_sample); | ||
printf("Fill buffer %d\n", FillBuffer); | ||
printf("Time buffered (ms) %d\n",(int)((1000.0 * regs.r[0] * DRENDERER_BUFFER_SIZE)/(double)spec->freq)); | ||
#endif | ||
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if (_kernel_swi(DigitalRenderer_NumBuffers, ®s, ®s) != 0) | ||
{ | ||
SDL_SetError("Can't set number of streaming sound buffers\n"); | ||
return -1; | ||
} | ||
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/* Now initialise sound system */ | ||
regs.r[0] = spec->channels; /* Number of channels */ | ||
regs.r[1] = DRENDERER_BUFFER_SIZE; /* Samples length */ | ||
regs.r[2] = spec->freq; /* frequency */ | ||
regs.r[3] = 1; /* Restore previous handler on exit */ | ||
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if (_kernel_swi(DigitalRenderer_Activate16, ®s, ®s) != 0) | ||
{ | ||
SDL_SetError("Unable to activate digital renderer in 16 bit mode\n"); | ||
return -1; | ||
} | ||
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if (_kernel_swi(DigitalRenderer_GetFrequency, ®s, ®s) == 0) | ||
{ | ||
spec->freq = regs.r[0]; | ||
} | ||
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#ifdef DUMP_AUDIO | ||
printf("Got format %d\n", spec->format); | ||
printf("Frequency %d\n", spec->freq); | ||
printf("Samples %d\n", spec->samples); | ||
#endif | ||
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/* Set to fill buffer with zero if we don't get data to it fast enough */ | ||
regs.r[0] = 1; | ||
regs.r[1] = ~1; | ||
_kernel_swi(DigitalRenderer_StreamFlags, ®s, ®s); | ||
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buffer = (Uint8 *)malloc(sizeof(Uint8) * spec->size); | ||
if (buffer == NULL) | ||
{ | ||
SDL_OutOfMemory(); | ||
return -1; | ||
} | ||
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/* Hopefully returning 2 will show success, but not start up an audio thread */ | ||
return 2; | ||
} | ||
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static void DRenderer_CloseAudio(_THIS) | ||
{ | ||
_kernel_swi_regs regs; | ||
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/* Close down the digital renderer */ | ||
_kernel_swi(DigitalRenderer_Deactivate, ®s, ®s); | ||
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if (buffer != NULL) free(buffer); | ||
} | ||
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