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SDL audio support
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gbeauche
parent
a83dfd52d0
commit
eed5724b80
316
BasiliskII/src/SDL/audio_sdl.cpp
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316
BasiliskII/src/SDL/audio_sdl.cpp
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@ -0,0 +1,316 @@
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/*
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* audio_sdl.cpp - Audio support, SDL implementation
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*
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* Basilisk II (C) 1997-2004 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sysdeps.h"
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#include "cpu_emulation.h"
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#include "main.h"
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#include "prefs.h"
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#include "user_strings.h"
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#include "audio.h"
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#include "audio_defs.h"
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#include <SDL_mutex.h>
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#include <SDL_audio.h>
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#define DEBUG 0
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#include "debug.h"
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// The currently selected audio parameters (indices in audio_sample_rates[] etc. vectors)
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static int audio_sample_rate_index = 0;
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static int audio_sample_size_index = 0;
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static int audio_channel_count_index = 0;
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// Global variables
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static SDL_sem *audio_irq_done_sem = NULL; // Signal from interrupt to streaming thread: data block read
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static uint8 silence_byte; // Byte value to use to fill sound buffers with silence
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// Prototypes
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static void stream_func(void *arg, uint8 *stream, int stream_len);
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/*
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* Initialization
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*/
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// Set AudioStatus to reflect current audio stream format
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static void set_audio_status_format(void)
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{
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AudioStatus.sample_rate = audio_sample_rates[audio_sample_rate_index];
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AudioStatus.sample_size = audio_sample_sizes[audio_sample_size_index];
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AudioStatus.channels = audio_channel_counts[audio_channel_count_index];
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}
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// Init SDL audio system
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static bool open_sdl_audio(void)
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{
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// SDL supports a variety of twisted little audio formats, all different
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if (audio_sample_sizes.empty()) {
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audio_sample_rates.push_back(11025 << 16);
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audio_sample_rates.push_back(22050 << 16);
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audio_sample_rates.push_back(44100 << 16);
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audio_sample_sizes.push_back(8);
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audio_sample_sizes.push_back(16);
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audio_channel_counts.push_back(1);
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audio_channel_counts.push_back(2);
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// Default to highest supported values
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audio_sample_rate_index = audio_sample_rates.size() - 1;
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audio_sample_size_index = audio_sample_sizes.size() - 1;
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audio_channel_count_index = audio_channel_counts.size() - 1;
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}
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SDL_AudioSpec audio_spec;
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audio_spec.freq = audio_sample_rates[audio_sample_rate_index] >> 16;
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audio_spec.format = (audio_sample_sizes[audio_sample_size_index] == 8) ? AUDIO_U8 : AUDIO_S16MSB;
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audio_spec.channels = audio_channel_counts[audio_channel_count_index];
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audio_spec.samples = 4096;
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audio_spec.callback = stream_func;
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audio_spec.userdata = NULL;
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// Open the audio device, forcing the desired format
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if (SDL_OpenAudio(&audio_spec, NULL) < 0) {
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fprintf(stderr, "WARNING: Cannot open audio: %s\n", SDL_GetError());
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return false;
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}
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char driver_name[32];
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printf("Using SDL/%s audio output\n", SDL_AudioDriverName(driver_name, sizeof(driver_name) - 1));
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silence_byte = audio_spec.silence;
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SDL_PauseAudio(0);
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// Sound buffer size = 4096 frames
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audio_frames_per_block = audio_spec.samples;
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return true;
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}
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static bool open_audio(void)
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{
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// Try to open SDL audio
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if (!open_sdl_audio()) {
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WarningAlert(GetString(STR_NO_AUDIO_WARN));
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return false;
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}
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// Device opened, set AudioStatus
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set_audio_status_format();
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// Everything went fine
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audio_open = true;
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return true;
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}
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void AudioInit(void)
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{
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// Init audio status and feature flags
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AudioStatus.sample_rate = 44100 << 16;
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AudioStatus.sample_size = 16;
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AudioStatus.channels = 2;
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AudioStatus.mixer = 0;
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AudioStatus.num_sources = 0;
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audio_component_flags = cmpWantsRegisterMessage | kStereoOut | k16BitOut;
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// Sound disabled in prefs? Then do nothing
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if (PrefsFindBool("nosound"))
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return;
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// Init semaphore
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audio_irq_done_sem = SDL_CreateSemaphore(0);
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// Open and initialize audio device
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open_audio();
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}
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/*
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* Deinitialization
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*/
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static void close_audio(void)
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{
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// Close audio device
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SDL_CloseAudio();
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audio_open = false;
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}
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void AudioExit(void)
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{
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// Close audio device
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close_audio();
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// Delete semaphore
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if (audio_irq_done_sem)
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SDL_DestroySemaphore(audio_irq_done_sem);
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}
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/*
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* First source added, start audio stream
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*/
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void audio_enter_stream()
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{
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}
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/*
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* Last source removed, stop audio stream
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*/
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void audio_exit_stream()
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{
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}
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/*
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* Streaming function
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*/
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static void stream_func(void *arg, uint8 *stream, int stream_len)
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{
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if (AudioStatus.num_sources) {
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// Trigger audio interrupt to get new buffer
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D(bug("stream: triggering irq\n"));
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SetInterruptFlag(INTFLAG_AUDIO);
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TriggerInterrupt();
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D(bug("stream: waiting for ack\n"));
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SDL_SemWait(audio_irq_done_sem);
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D(bug("stream: ack received\n"));
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// Get size of audio data
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uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
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if (apple_stream_info) {
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int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
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D(bug("stream: work_size %d\n", work_size));
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if (work_size > stream_len)
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work_size = stream_len;
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if (work_size == 0)
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goto silence;
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// Send data to audio device
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Mac2Host_memcpy(stream, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
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if (work_size != stream_len)
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memset((uint8 *)stream + work_size, silence_byte, stream_len - work_size);
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D(bug("stream: data written\n"));
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} else
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goto silence;
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} else {
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// Audio not active, play silence
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silence: memset(stream, silence_byte, stream_len);
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}
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}
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/*
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* MacOS audio interrupt, read next data block
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*/
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void AudioInterrupt(void)
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{
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D(bug("AudioInterrupt\n"));
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// Get data from apple mixer
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if (AudioStatus.mixer) {
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M68kRegisters r;
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r.a[0] = audio_data + adatStreamInfo;
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r.a[1] = AudioStatus.mixer;
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Execute68k(audio_data + adatGetSourceData, &r);
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D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
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} else
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WriteMacInt32(audio_data + adatStreamInfo, 0);
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// Signal stream function
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SDL_SemPost(audio_irq_done_sem);
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D(bug("AudioInterrupt done\n"));
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}
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/*
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* Set sampling parameters
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* "index" is an index into the audio_sample_rates[] etc. vectors
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* It is guaranteed that AudioStatus.num_sources == 0
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*/
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bool audio_set_sample_rate(int index)
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{
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close_audio();
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audio_sample_rate_index = index;
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return open_audio();
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}
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bool audio_set_sample_size(int index)
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{
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close_audio();
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audio_sample_size_index = index;
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return open_audio();
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}
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bool audio_set_channels(int index)
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{
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close_audio();
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audio_channel_count_index = index;
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return open_audio();
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}
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/*
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* Get/set volume controls (volume values received/returned have the left channel
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* volume in the upper 16 bits and the right channel volume in the lower 16 bits;
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* both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
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*/
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bool audio_get_main_mute(void)
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{
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return false;
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}
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uint32 audio_get_main_volume(void)
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{
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return 0x01000100;
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}
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bool audio_get_speaker_mute(void)
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{
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return false;
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}
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uint32 audio_get_speaker_volume(void)
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{
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return 0x01000100;
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}
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void audio_set_main_mute(bool mute)
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{
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}
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void audio_set_main_volume(uint32 vol)
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{
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}
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void audio_set_speaker_mute(bool mute)
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{
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}
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void audio_set_speaker_volume(uint32 vol)
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{
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}
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@ -22,6 +22,7 @@ AC_ARG_ENABLE(vosf, [ --enable-vosf enable video on SEGV sig
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dnl SDL options.
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AC_ARG_ENABLE(sdl-video, [ --enable-sdl-video use SDL for video graphics [default=no]], [WANT_SDL_VIDEO=$enableval], [WANT_SDL_VIDEO=no])
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AC_ARG_ENABLE(sdl-audio, [ --enable-sdl-audio use SDL for audio [default=no]], [WANT_SDL_AUDIO=$enableval], [WANT_SDL_AUDIO=no])
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dnl JIT compiler options.
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AC_ARG_ENABLE(jit-compiler, [ --enable-jit-compiler enable JIT compiler [default=no]], [WANT_JIT=$enableval], [WANT_JIT=no])
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@ -128,13 +129,16 @@ AC_CHECK_LIB(rt, timer_create)
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dnl Do we need SDL?
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WANT_SDL=no
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SDL_SUPPORT="none"
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if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
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WANT_SDL=yes
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WANT_XF86_DGA=no
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WANT_XF86_VIDMODE=no
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WANT_FBDEV_DGA=no
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SDL_SUPPORT="video"
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SDL_SUPPORT="$SDL_SUPPORT video"
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fi
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if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
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WANT_SDL=yes
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SDL_SUPPORT="$SDL_SUPPORT audio"
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fi
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if [[ "x$WANT_SDL" = "xyes" ]]; then
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AC_PATH_PROG(sdl_config, "sdl-config")
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@ -147,6 +151,9 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
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else
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WANT_SDL=no
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fi
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SDL_SUPPORT=`echo "$SDL_SUPPORT" | sed -e "s/^ //"`
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else
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SDL_SUPPORT="none"
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fi
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dnl We need X11, if not using SDL.
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@ -445,8 +452,8 @@ if [[ "x$WANT_SDL" = "xyes" ]]; then
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AC_DEFINE(USE_SDL, 1, [Define to enble SDL support])
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fi
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if [[ "x$WANT_SDL_VIDEO" = "xyes" ]]; then
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VIDEOSRCS="../SDL/video_sdl.cpp"
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AC_DEFINE(USE_SDL_VIDEO, 1, [Define to enable SDL video graphics support])
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VIDEOSRCS="../SDL/video_sdl.cpp"
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KEYCODES="../SDL/keycodes"
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if [[ "x$ac_cv_framework_Carbon" = "xyes" ]]; then
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EXTRASYSSRCS="$EXTRASYSSRCS ../MacOSX/clip_macosx.cpp"
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@ -458,6 +465,10 @@ else
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KEYCODES="keycodes"
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EXTRASYSSRCS="$EXTRASYSSRCS clip_unix.cpp"
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fi
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if [[ "x$WANT_SDL_AUDIO" = "xyes" ]]; then
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AC_DEFINE(USE_SDL_AUDIO, 1, [Define to enable SDL audio support])
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AUDIOSRC="../SDL/audio_sdl.cpp"
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fi
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dnl Use 68k CPU natively?
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WANT_NATIVE_M68K=no
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@ -393,6 +393,9 @@ int main(int argc, char **argv)
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int sdl_flags = 0;
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#ifdef USE_SDL_VIDEO
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sdl_flags |= SDL_INIT_VIDEO;
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#endif
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#ifdef USE_SDL_AUDIO
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sdl_flags |= SDL_INIT_AUDIO;
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#endif
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assert(sdl_flags != 0);
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if (SDL_Init(sdl_flags) == -1) {
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