Add untested preliminary audio backend for Solaris

src/Backends/Audio/SoftwareMixer/Solaris.cpp

@@ -0,0 +1,88 @@
+// Released under the MIT licence.
+// See LICENCE.txt for details.
+
+#include "Backend.h"
+
+#include <cstdint>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+#include <sys/audio.h>
+#include <pthread.h>
+
+int sndfp;
+void (*parent_callback)(long *stream, size_t frames_total);
+
+static void* soundcheckthread(void*) {
+    unsigned long for_as_long_as_it_seems_we_should = 0;
+    uint16_t out[0x400 * 2];
+    while(1) {
+        bool ready = false;
+        audio_prinfo_t audioInfo;
+        ioctl(sndfp, AUDIO_GETINFO, &audioInfo);
+        int oldeof = audioInfo.eof;
+
+        usleep(for_as_long_as_it_seems_we_should);
+
+        while(ready == false) {
+            ioctl(sndfp, AUDIO_GETINFO, &audioInfo);
+            if(audioInfo.eof > oldeof) {
+                ready = true;
+            }
+        }
+
+        long mix[0x400 * 2];
+        memset(mix, 0, 0x400 * 2);
+        parent_callback(mix, 0x400 * 2);
+
+        write(sndfp, mix, 0x400 * 2);
+
+        for_as_long_as_it_seems_we_should = (0x400 / 48000) * 1000000;
+    }
+}
+
+unsigned long SoftwareMixerBackend_Init(void (*callback)(long *stream, size_t frames_total)) {
+    sndfp = open("/dev/audio", 0, O_WRONLY);
+
+    audio_prinfo_t audioInfo;
+    ioctl(sndfp, AUDIO_GETINFO, &audioInfo);
+    audioInfo.sample_rate = 48000;
+    audioInfo.channels = 2;
+    audioInfo.precision = 16;
+    audioInfo.encoding = AUDIO_ENCODING_LINEAR;
+    audioInfo.port = AUDIO_SPEAKER;
+    ioctl(sndfp, AUDIO_SETINFO, &audioInfo);
+
+    pthread_t thread;
+    pthread_attr_t thread_attr;
+    pthread_attr_init(&thread_attr);
+
+    pthread_create(&thread, &thread_attr, soundcheckthread, (void*)NULL);
+
+    return 48000; // return the sampling rate
+}
+
+void SoftwareMixerBackend_Deinit(void) {
+    close(sndfp);
+}
+
+bool SoftwareMixerBackend_Start(void) {
+    return true;
+}
+
+void SoftwareMixerBackend_LockMixerMutex(void) {
+}
+
+void SoftwareMixerBackend_UnlockMixerMutex(void) {
+}
+
+void SoftwareMixerBackend_LockOrganyaMutex(void) {
+}
+
+void SoftwareMixerBackend_UnlockOrganyaMutex(void) {
+}