SDL audio support

This commit is contained in:
gbeauche 2004-07-19 19:25:07 +00:00
parent a83dfd52d0
commit eed5724b80
3 changed files with 333 additions and 3 deletions

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@ -0,0 +1,316 @@
/*
* audio_sdl.cpp - Audio support, SDL implementation
*
* Basilisk II (C) 1997-2004 Christian Bauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "sysdeps.h"
#include "cpu_emulation.h"
#include "main.h"
#include "prefs.h"
#include "user_strings.h"
#include "audio.h"
#include "audio_defs.h"
#include <SDL_mutex.h>
#include <SDL_audio.h>
#define DEBUG 0
#include "debug.h"
// The currently selected audio parameters (indices in audio_sample_rates[] etc. vectors)
static int audio_sample_rate_index = 0;
static int audio_sample_size_index = 0;
static int audio_channel_count_index = 0;
// Global variables
static SDL_sem *audio_irq_done_sem = NULL; // Signal from interrupt to streaming thread: data block read
static uint8 silence_byte; // Byte value to use to fill sound buffers with silence
// Prototypes
static void stream_func(void *arg, uint8 *stream, int stream_len);
/*
* Initialization
*/
// Set AudioStatus to reflect current audio stream format
static void set_audio_status_format(void)
{
AudioStatus.sample_rate = audio_sample_rates[audio_sample_rate_index];
AudioStatus.sample_size = audio_sample_sizes[audio_sample_size_index];
AudioStatus.channels = audio_channel_counts[audio_channel_count_index];
}
// Init SDL audio system
static bool open_sdl_audio(void)
{
// SDL supports a variety of twisted little audio formats, all different
if (audio_sample_sizes.empty()) {
audio_sample_rates.push_back(11025 << 16);
audio_sample_rates.push_back(22050 << 16);
audio_sample_rates.push_back(44100 << 16);
audio_sample_sizes.push_back(8);
audio_sample_sizes.push_back(16);
audio_channel_counts.push_back(1);
audio_channel_counts.push_back(2);
// Default to highest supported values
audio_sample_rate_index = audio_sample_rates.size() - 1;
audio_sample_size_index = audio_sample_sizes.size() - 1;
audio_channel_count_index = audio_channel_counts.size() - 1;
}
SDL_AudioSpec audio_spec;
audio_spec.freq = audio_sample_rates[audio_sample_rate_index] >> 16;
audio_spec.format = (audio_sample_sizes[audio_sample_size_index] == 8) ? AUDIO_U8 : AUDIO_S16MSB;
audio_spec.channels = audio_channel_counts[audio_channel_count_index];
audio_spec.samples = 4096;
audio_spec.callback = stream_func;
audio_spec.userdata = NULL;
// Open the audio device, forcing the desired format
if (SDL_OpenAudio(&audio_spec, NULL) < 0) {
fprintf(stderr, "WARNING: Cannot open audio: %s\n", SDL_GetError());
return false;
}
char driver_name[32];
printf("Using SDL/%s audio output\n", SDL_AudioDriverName(driver_name, sizeof(driver_name) - 1));
silence_byte = audio_spec.silence;
SDL_PauseAudio(0);
// Sound buffer size = 4096 frames
audio_frames_per_block = audio_spec.samples;
return true;
}
static bool open_audio(void)
{
// Try to open SDL audio
if (!open_sdl_audio()) {
WarningAlert(GetString(STR_NO_AUDIO_WARN));
return false;
}
// Device opened, set AudioStatus
set_audio_status_format();
// Everything went fine
audio_open = true;
return true;
}
void AudioInit(void)
{
// Init audio status and feature flags
AudioStatus.sample_rate = 44100 << 16;
AudioStatus.sample_size = 16;
AudioStatus.channels = 2;
AudioStatus.mixer = 0;
AudioStatus.num_sources = 0;
audio_component_flags = cmpWantsRegisterMessage | kStereoOut | k16BitOut;
// Sound disabled in prefs? Then do nothing
if (PrefsFindBool("nosound"))
return;
// Init semaphore
audio_irq_done_sem = SDL_CreateSemaphore(0);
// Open and initialize audio device
open_audio();
}
/*
* Deinitialization
*/
static void close_audio(void)
{
// Close audio device
SDL_CloseAudio();
audio_open = false;
}
void AudioExit(void)
{
// Close audio device
close_audio();
// Delete semaphore
if (audio_irq_done_sem)
SDL_DestroySemaphore(audio_irq_done_sem);
}
/*
* First source added, start audio stream
*/
void audio_enter_stream()
{
}
/*
* Last source removed, stop audio stream
*/
void audio_exit_stream()
{
}
/*
* Streaming function
*/
static void stream_func(void *arg, uint8 *stream, int stream_len)
{
if (AudioStatus.num_sources) {
// Trigger audio interrupt to get new buffer
D(bug("stream: triggering irq\n"));
SetInterruptFlag(INTFLAG_AUDIO);
TriggerInterrupt();
D(bug("stream: waiting for ack\n"));
SDL_SemWait(audio_irq_done_sem);
D(bug("stream: ack received\n"));
// Get size of audio data
uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
if (apple_stream_info) {
int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
D(bug("stream: work_size %d\n", work_size));
if (work_size > stream_len)
work_size = stream_len;
if (work_size == 0)
goto silence;
// Send data to audio device
Mac2Host_memcpy(stream, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
if (work_size != stream_len)
memset((uint8 *)stream + work_size, silence_byte, stream_len - work_size);
D(bug("stream: data written\n"));
} else
goto silence;
} else {
// Audio not active, play silence
silence: memset(stream, silence_byte, stream_len);
}
}
/*
* MacOS audio interrupt, read next data block
*/
void AudioInterrupt(void)
{
D(bug("AudioInterrupt\n"));
// Get data from apple mixer
if (AudioStatus.mixer) {
M68kRegisters r;
r.a[0] = audio_data + adatStreamInfo;
r.a[1] = AudioStatus.mixer;
Execute68k(audio_data + adatGetSourceData, &r);
D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
} else
WriteMacInt32(audio_data + adatStreamInfo, 0);
// Signal stream function
SDL_SemPost(audio_irq_done_sem);
D(bug("AudioInterrupt done\n"));
}
/*
* Set sampling parameters
* "index" is an index into the audio_sample_rates[] etc. vectors
* It is guaranteed that AudioStatus.num_sources == 0
*/
bool audio_set_sample_rate(int index)
{
close_audio();
audio_sample_rate_index = index;
return open_audio();
}
bool audio_set_sample_size(int index)
{
close_audio();
audio_sample_size_index = index;
return open_audio();
}
bool audio_set_channels(int index)
{
close_audio();
audio_channel_count_index = index;
return open_audio();
}
/*
* Get/set volume controls (volume values received/returned have the left channel
* volume in the upper 16 bits and the right channel volume in the lower 16 bits;
* both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
*/
bool audio_get_main_mute(void)
{
return false;
}
uint32 audio_get_main_volume(void)
{
return 0x01000100;
}
bool audio_get_speaker_mute(void)
{
return false;
}
uint32 audio_get_speaker_volume(void)
{
return 0x01000100;
}
void audio_set_main_mute(bool mute)
{
}
void audio_set_main_volume(uint32 vol)
{
}
void audio_set_speaker_mute(bool mute)
{
}
void audio_set_speaker_volume(uint32 vol)
{
}

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@ -22,6 +22,7 @@ AC_ARG_ENABLE(vosf, [ --enable-vosf enable video on SEGV sig
dnl SDL options.
AC_ARG_ENABLE(sdl-video, [ --enable-sdl-video use SDL for video graphics [default=no]], [WANT_SDL_VIDEO=$enableval], [WANT_SDL_VIDEO=no])
AC_ARG_ENABLE(sdl-audio, [ --enable-sdl-audio use SDL for audio [default=no]], [WANT_SDL_AUDIO=$enableval], [WANT_SDL_AUDIO=no])
dnl JIT compiler options.
AC_ARG_ENABLE(jit-compiler, [ --enable-jit-compiler enable JIT compiler [default=no]], [WANT_JIT=$enableval], [WANT_JIT=no])
@ -128,13 +129,16 @@ AC_CHECK_LIB(rt, timer_create)
dnl Do we need SDL?
WANT_SDL=no
SDL_SUPPORT="none"
if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
WANT_SDL=yes
WANT_XF86_DGA=no
WANT_XF86_VIDMODE=no
WANT_FBDEV_DGA=no
SDL_SUPPORT="video"
SDL_SUPPORT="$SDL_SUPPORT video"
fi
if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
WANT_SDL=yes
SDL_SUPPORT="$SDL_SUPPORT audio"
fi
if [[ "x$WANT_SDL" = "xyes" ]]; then
AC_PATH_PROG(sdl_config, "sdl-config")
@ -147,6 +151,9 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
else
WANT_SDL=no
fi
SDL_SUPPORT=`echo "$SDL_SUPPORT" | sed -e "s/^ //"`
else
SDL_SUPPORT="none"
fi
dnl We need X11, if not using SDL.
@ -445,8 +452,8 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
AC_DEFINE(USE_SDL, 1, [Define to enble SDL support])
fi
if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
VIDEOSRCS="../SDL/video_sdl.cpp"
AC_DEFINE(USE_SDL_VIDEO, 1, [Define to enable SDL video graphics support])
VIDEOSRCS="../SDL/video_sdl.cpp"
KEYCODES="../SDL/keycodes"
if [[ "x$ac_cv_framework_Carbon" = "xyes" ]]; then
EXTRASYSSRCS="$EXTRASYSSRCS ../MacOSX/clip_macosx.cpp"
@ -458,6 +465,10 @@ else
KEYCODES="keycodes"
EXTRASYSSRCS="$EXTRASYSSRCS clip_unix.cpp"
fi
if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
AC_DEFINE(USE_SDL_AUDIO, 1, [Define to enable SDL audio support])
AUDIOSRC="../SDL/audio_sdl.cpp"
fi
dnl Use 68k CPU natively?
WANT_NATIVE_M68K=no

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@ -393,6 +393,9 @@ int main(int argc, char **argv)
int sdl_flags = 0;
#ifdef USE_SDL_VIDEO
sdl_flags |= SDL_INIT_VIDEO;
#endif
#ifdef USE_SDL_AUDIO
sdl_flags |= SDL_INIT_AUDIO;
#endif
assert(sdl_flags != 0);
if (SDL_Init(sdl_flags) == -1) {