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macemu/BasiliskII/src/SDL/audio_sdl.cpp

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/*
* audio_sdl.cpp - Audio support, SDL implementation
*
* Basilisk II (C) 1997-2008 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>
#include <SDL_version.h>
#include <SDL_timer.h>
#define DEBUG 0
#include "debug.h"
#if defined(BINCUE)
#include "bincue.h"
#endif
#define MAC_MAX_VOLUME 0x0100
// 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
static uint8 *audio_mix_buf = NULL;
static int main_volume = MAC_MAX_VOLUME;
static int speaker_volume = MAC_MAX_VOLUME;
static bool main_mute = false;
static bool speaker_mute = false;
// Prototypes
static void stream_func(void *arg, uint8 *stream, int stream_len);
static int get_audio_volume();
/*
* 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;
memset(&audio_spec, 0, sizeof(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 >> PrefsFindInt32("sound_buffer");
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;
}
#if SDL_VERSION_ATLEAST(2,0,0)
// HACK: workaround a bug in SDL pre-2.0.6 (reported via https://bugzilla.libsdl.org/show_bug.cgi?id=3710 )
// whereby SDL does not update audio_spec.size
if (audio_spec.size == 0) {
audio_spec.size = (SDL_AUDIO_BITSIZE(audio_spec.format) / 8) * audio_spec.channels * audio_spec.samples;
}
#endif
#if defined(BINCUE)
OpenAudio_bincue(audio_spec.freq, audio_spec.format, audio_spec.channels,
audio_spec.silence, get_audio_volume());
#endif
#if SDL_VERSION_ATLEAST(2,0,0)
const char * driver_name = SDL_GetCurrentAudioDriver();
#else
char driver_name[32];
SDL_AudioDriverName(driver_name, sizeof(driver_name) - 1);
#endif
printf("Using SDL/%s audio output\n", driver_name ? driver_name : "");
silence_byte = audio_spec.silence;
SDL_PauseAudio(0);
// Sound buffer size = 4096 frames
audio_frames_per_block = audio_spec.samples;
audio_mix_buf = (uint8*)malloc(audio_spec.size);
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();
free(audio_mix_buf);
audio_mix_buf = NULL;
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 && !main_mute && !speaker_mute) {
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(audio_mix_buf, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
memset((uint8 *)stream, silence_byte, stream_len);
SDL_MixAudio(stream, audio_mix_buf, work_size, get_audio_volume());
D(bug("stream: data written\n"));
} else
goto silence;
} else {
// Audio not active, play silence
silence: memset(stream, silence_byte, stream_len);
}
#if defined(BINCUE)
MixAudio_bincue(stream, stream_len, get_audio_volume());
#endif
}
/*
* 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 main_mute;
}
uint32 audio_get_main_volume(void)
{
uint32 chan = main_volume;
return (chan << 16) + chan;
}
bool audio_get_speaker_mute(void)
{
return speaker_mute;
}
uint32 audio_get_speaker_volume(void)
{
uint32 chan = speaker_volume;
return (chan << 16) + chan;
}
void audio_set_main_mute(bool mute)
{
main_mute = mute;
}
void audio_set_main_volume(uint32 vol)
{
// We only have one-channel volume right now.
main_volume = ((vol >> 16) + (vol & 0xffff)) / 2;
if (main_volume > MAC_MAX_VOLUME)
main_volume = MAC_MAX_VOLUME;
}
void audio_set_speaker_mute(bool mute)
{
speaker_mute = mute;
}
void audio_set_speaker_volume(uint32 vol)
{
// We only have one-channel volume right now.
speaker_volume = ((vol >> 16) + (vol & 0xffff)) / 2;
if (speaker_volume > MAC_MAX_VOLUME)
speaker_volume = MAC_MAX_VOLUME;
}
static int get_audio_volume() {
return main_volume * speaker_volume * SDL_MIX_MAXVOLUME / (MAC_MAX_VOLUME * MAC_MAX_VOLUME);
}
#if SDL_VERSION_ATLEAST(2,0,0)
static int play_startup(void *arg) {
SDL_AudioSpec wav_spec;
Uint8 *wav_buffer;
Uint32 wav_length;
if (SDL_LoadWAV("startup.wav", &wav_spec, &wav_buffer, &wav_length)) {
SDL_AudioSpec obtained;
SDL_AudioDeviceID deviceId = SDL_OpenAudioDevice(NULL, 0, &wav_spec, &obtained, 0);
if (deviceId) {
SDL_QueueAudio(deviceId, wav_buffer, wav_length);
SDL_PauseAudioDevice(deviceId, 0);
while (SDL_GetQueuedAudioSize(deviceId)) SDL_Delay(10);
SDL_Delay(500);
SDL_CloseAudioDevice(deviceId);
}
else printf("play_startup: Audio driver failed to initialize\n");
SDL_FreeWAV(wav_buffer);
}
return 0;
}
void PlayStartupSound() {
SDL_CreateThread(play_startup, "", NULL);
}
#else
void PlayStartupSound() {
// Not implemented
}
#endif
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