2 files changed, 201 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.c b/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.c
new file mode 100644
index 0000000..6579f1b
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.c
@@ -0,0 +1,159 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "../SDL_sysaudio.h"
+#include "SDL_ps2audio.h"
+
+#include <kernel.h>
+#include <audsrv.h>
+#include <ps2_audio_driver.h>
+
+static bool PS2AUDIO_OpenDevice(SDL_AudioDevice *device)
+{
+    device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden));
+    if (!device->hidden) {
+        return false;
+    }
+
+    // These are the native supported audio PS2 configs
+    switch (device->spec.freq) {
+    case 11025:
+    case 12000:
+    case 22050:
+    case 24000:
+    case 32000:
+    case 44100:
+    case 48000:
+        break;  // acceptable value, keep it
+    default:
+        device->spec.freq = 48000;
+        break;
+    }
+
+    device->sample_frames = 512;
+    device->spec.channels = device->spec.channels == 1 ? 1 : 2;
+    device->spec.format = device->spec.format == SDL_AUDIO_S8 ? SDL_AUDIO_S8 : SDL_AUDIO_S16;
+
+    struct audsrv_fmt_t format;
+    format.bits = device->spec.format == SDL_AUDIO_S8 ? 8 : 16;
+    format.freq = device->spec.freq;
+    format.channels = device->spec.channels;
+
+    device->hidden->channel = audsrv_set_format(&format);
+    audsrv_set_volume(MAX_VOLUME);
+
+    if (device->hidden->channel < 0) {
+        return SDL_SetError("Couldn't reserve hardware channel");
+    }
+
+    // Update the fragment size as size in bytes.
+    SDL_UpdatedAudioDeviceFormat(device);
+
+    /* Allocate the mixing buffer.  Its size and starting address must
+       be a multiple of 64 bytes.  Our sample count is already a multiple of
+       64, so spec->size should be a multiple of 64 as well. */
+    const int mixlen = device->buffer_size * NUM_BUFFERS;
+    device->hidden->rawbuf = (Uint8 *)SDL_aligned_alloc(64, mixlen);
+    if (!device->hidden->rawbuf) {
+        return SDL_SetError("Couldn't allocate mixing buffer");
+    }
+
+    SDL_memset(device->hidden->rawbuf, device->silence_value, mixlen);
+    for (int i = 0; i < NUM_BUFFERS; i++) {
+        device->hidden->mixbufs[i] = &device->hidden->rawbuf[i * device->buffer_size];
+    }
+
+    return true;
+}
+
+static bool PS2AUDIO_PlayDevice(SDL_AudioDevice *device, const Uint8 *buffer, int buflen)
+{
+    // this returns number of bytes accepted or a negative error. We assume anything other than buflen is a fatal error.
+    return (audsrv_play_audio((char *)buffer, buflen) == buflen);
+}
+
+static bool PS2AUDIO_WaitDevice(SDL_AudioDevice *device)
+{
+    audsrv_wait_audio(device->buffer_size);
+    return true;
+}
+
+static Uint8 *PS2AUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
+{
+    Uint8 *buffer = device->hidden->mixbufs[device->hidden->next_buffer];
+    device->hidden->next_buffer = (device->hidden->next_buffer + 1) % NUM_BUFFERS;
+    return buffer;
+}
+
+static void PS2AUDIO_CloseDevice(SDL_AudioDevice *device)
+{
+    if (device->hidden) {
+        if (device->hidden->channel >= 0) {
+            audsrv_stop_audio();
+            device->hidden->channel = -1;
+        }
+
+        if (device->hidden->rawbuf) {
+            SDL_aligned_free(device->hidden->rawbuf);
+            device->hidden->rawbuf = NULL;
+        }
+        SDL_free(device->hidden);
+        device->hidden = NULL;
+    }
+}
+
+static void PS2AUDIO_ThreadInit(SDL_AudioDevice *device)
+{
+    /* Increase the priority of this audio thread by 1 to put it
+       ahead of other SDL threads. */
+    const int32_t thid = GetThreadId();
+    ee_thread_status_t status;
+    if (ReferThreadStatus(thid, &status) == 0) {
+        ChangeThreadPriority(thid, status.current_priority - 1);
+    }
+}
+
+static void PS2AUDIO_Deinitialize(void)
+{
+    deinit_audio_driver();
+}
+
+static bool PS2AUDIO_Init(SDL_AudioDriverImpl *impl)
+{
+    if (init_audio_driver() < 0) {
+        return false;
+    }
+
+    impl->OpenDevice = PS2AUDIO_OpenDevice;
+    impl->PlayDevice = PS2AUDIO_PlayDevice;
+    impl->WaitDevice = PS2AUDIO_WaitDevice;
+    impl->GetDeviceBuf = PS2AUDIO_GetDeviceBuf;
+    impl->CloseDevice = PS2AUDIO_CloseDevice;
+    impl->ThreadInit = PS2AUDIO_ThreadInit;
+    impl->Deinitialize = PS2AUDIO_Deinitialize;
+    impl->OnlyHasDefaultPlaybackDevice = true;
+    return true; // this audio target is available.
+}
+
+AudioBootStrap PS2AUDIO_bootstrap = {
+    "ps2", "PS2 audio driver", PS2AUDIO_Init, false, false
+};
diff --git a/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.h b/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.h
new file mode 100644
index 0000000..5a0ecea
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/audio/ps2/SDL_ps2audio.h
@@ -0,0 +1,42 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_ps2audio_h_
+#define SDL_ps2audio_h_
+
+#include "../SDL_sysaudio.h"
+
+#define NUM_BUFFERS 2
+
+struct SDL_PrivateAudioData
+{
+    // The hardware output channel.
+    int channel;
+    // The raw allocated mixing buffer.
+    Uint8 *rawbuf;
+    // Individual mixing buffers.
+    Uint8 *mixbufs[NUM_BUFFERS];
+    // Index of the next available mixing buffer.
+    int next_buffer;
+};
+
+#endif // SDL_ps2audio_h_