389 lines
10 KiB
C++
389 lines
10 KiB
C++
/*
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* audio_sdl3.cpp - Audio support, SDL implementation
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*
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* Basilisk II (C) 1997-2008 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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#include <SDL_version.h>
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#include <SDL_timer.h>
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#if SDL_VERSION_ATLEAST(3, 0, 0)
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#include <SDL_init.h>
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#include <queue>
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#define DEBUG 0
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#include "debug.h"
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#if defined(BINCUE)
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#include "bincue.h"
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#endif
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#define MAC_MAX_VOLUME 0x0100
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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_Semaphore *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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static int main_volume = MAC_MAX_VOLUME;
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static int speaker_volume = MAC_MAX_VOLUME;
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static bool main_mute = false;
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static bool speaker_mute = false;
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volatile static bool playing_startup, exit_startup;
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SDL_AudioSpec audio_spec;
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// Prototypes
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static void SDLCALL stream_func(void *arg, SDL_AudioStream *stream, int additional_amount, int total_amount);
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static int get_audio_volume();
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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 = (int)audio_sample_rates.size() - 1;
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audio_sample_size_index = (int)audio_sample_sizes.size() - 1;
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audio_channel_count_index = (int)audio_channel_counts.size() - 1;
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}
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//memset(&audio_spec, 0, sizeof(audio_spec));
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audio_spec.format = (audio_sample_sizes[audio_sample_size_index] == 8) ? SDL_AUDIO_U8 : SDL_AUDIO_S16BE;
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audio_spec.channels = audio_channel_counts[audio_channel_count_index];
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audio_spec.freq = audio_sample_rates[audio_sample_rate_index] >> 16;
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// Open the audio device, forcing the desired format
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SDL_AudioStream *stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_OUTPUT, &audio_spec, stream_func, NULL);
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if (stream == NULL) {
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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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silence_byte = SDL_GetSilenceValueForFormat(audio_spec.format);
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#if defined(BINCUE)
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OpenAudio_bincue(audio_spec.freq, audio_spec.format, audio_spec.channels, silence_byte, get_audio_volume());
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#endif
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printf("Using SDL/%s audio output\n", SDL_GetCurrentAudioDriver());
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audio_frames_per_block = 4096 >> PrefsFindInt32("sound_buffer");
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SDL_ResumeAudioDevice(SDL_GetAudioStreamDevice(stream));
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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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exit_startup = true;
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while (playing_startup)
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SDL_Delay(10);
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exit_startup = false;
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// Close audio device
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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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 SDLCALL stream_func(void *, SDL_AudioStream *stream, int stream_len, int /*total_amount*/)
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{
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static std::queue<uint8> q;
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if (AudioStatus.num_sources) {
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while (q.size() < stream_len) {
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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_WaitSemaphore(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 && !main_mute && !speaker_mute) {
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int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
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uint8 buf[work_size];
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Mac2Host_memcpy(buf, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
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for (int i = 0; i < work_size; i++) q.push(buf[i]);
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}
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else {
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while (!q.empty()) q.pop();
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break;
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}
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}
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}
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uint8 src[stream_len], dst[stream_len];
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for (int i = 0; i < stream_len; i++)
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if (q.empty()) src[i] = silence_byte;
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else {
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src[i] = q.front();
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q.pop();
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}
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memset(dst, silence_byte, stream_len);
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//SDL_AudioSpec audio_spec;
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//int r = SDL_GetAudioStreamFormat(stream, NULL, &audio_spec);// little endianが帰ってくる
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SDL_MixAudioFormat(dst, src, audio_spec.format, stream_len, get_audio_volume());
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#if defined(BINCUE)
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MixAudio_bincue(dst, stream_len, get_audio_volume());
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#endif
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SDL_PutAudioStreamData(stream, dst, stream_len);
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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_PostSemaphore(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 main_mute;
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}
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uint32 audio_get_main_volume(void)
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{
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uint32 chan = main_volume;
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return (chan << 16) + chan;
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}
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bool audio_get_speaker_mute(void)
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{
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return speaker_mute;
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}
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uint32 audio_get_speaker_volume(void)
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{
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uint32 chan = speaker_volume;
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return (chan << 16) + chan;
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}
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void audio_set_main_mute(bool mute)
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{
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main_mute = mute;
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}
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void audio_set_main_volume(uint32 vol)
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{
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// We only have one-channel volume right now.
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main_volume = ((vol >> 16) + (vol & 0xffff)) / 2;
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if (main_volume > MAC_MAX_VOLUME)
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main_volume = MAC_MAX_VOLUME;
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}
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void audio_set_speaker_mute(bool mute)
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{
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speaker_mute = mute;
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}
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void audio_set_speaker_volume(uint32 vol)
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{
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// We only have one-channel volume right now.
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speaker_volume = ((vol >> 16) + (vol & 0xffff)) / 2;
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if (speaker_volume > MAC_MAX_VOLUME)
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speaker_volume = MAC_MAX_VOLUME;
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}
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static int get_audio_volume() {
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return main_volume * speaker_volume * SDL_MIX_MAXVOLUME / (MAC_MAX_VOLUME * MAC_MAX_VOLUME);
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}
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static int play_startup(void *arg) {
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SDL_AudioSpec wav_spec;
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Uint8 *wav_buffer;
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Uint32 wav_length;
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if (!playing_startup && !SDL_LoadWAV("startup.wav", &wav_spec, &wav_buffer, &wav_length)) {
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SDL_AudioStream *stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_OUTPUT, &wav_spec, NULL, NULL);
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if (stream) {
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SDL_ResumeAudioDevice(SDL_GetAudioStreamDevice(stream));
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SDL_PutAudioStreamData(stream, wav_buffer, wav_length);
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playing_startup = true;
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while (!exit_startup && SDL_GetAudioStreamAvailable(stream)) SDL_Delay(10);
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if (!exit_startup) SDL_Delay(500);
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SDL_DestroyAudioStream(stream);
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}
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else printf("play_startup: Audio driver failed to initialize\n");
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SDL_free(wav_buffer);
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playing_startup = false;
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}
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return 0;
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}
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void PlayStartupSound() {
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SDL_CreateThread(play_startup, "play_startup", NULL);
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}
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#endif // SDL_VERSION_ATLEAST
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