mirror of
https://github.com/libretro/RetroArch.git
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385 lines
9.6 KiB
C
385 lines
9.6 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the 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 along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "driver.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <dsound.h>
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#include "fifo_buffer.h"
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#include "general.h"
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typedef struct dsound
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{
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LPDIRECTSOUND ds;
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LPDIRECTSOUNDBUFFER dsb;
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HANDLE event;
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bool nonblock;
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fifo_buffer_t *buffer;
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CRITICAL_SECTION crit;
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volatile bool thread_alive;
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HANDLE thread;
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unsigned buffer_size;
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} dsound_t;
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static inline unsigned write_avail(unsigned read_ptr, unsigned write_ptr, unsigned buffer_mask)
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{
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return (read_ptr + buffer_mask + 1 - write_ptr) & buffer_mask;
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}
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static inline void get_positions(dsound_t *ds, DWORD *read_ptr, DWORD *write_ptr)
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{
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IDirectSoundBuffer_GetCurrentPosition(ds->dsb, read_ptr, write_ptr);
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}
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#define CHUNK_SIZE 256
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#define BUFFER_ERROR ((void*)-1)
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struct audio_lock
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{
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void *chunk1;
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DWORD size1;
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void *chunk2;
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DWORD size2;
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};
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static inline bool grab_region(dsound_t *ds, DWORD write_ptr, struct audio_lock *region)
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{
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HRESULT res = IDirectSoundBuffer_Lock(ds->dsb, write_ptr, CHUNK_SIZE, ®ion->chunk1, ®ion->size1, ®ion->chunk2, ®ion->size2, 0);
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if (res == DSERR_BUFFERLOST)
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{
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res = IDirectSoundBuffer_Restore(ds->dsb);
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if (res != DS_OK)
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return false;
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res = IDirectSoundBuffer_Lock(ds->dsb, write_ptr, CHUNK_SIZE, ®ion->chunk1, ®ion->size1, ®ion->chunk2, ®ion->size2, 0);
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if (res != DS_OK)
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return false;
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}
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const char *err;
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switch (res)
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{
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case DSERR_BUFFERLOST:
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err = "DSERR_BUFFERLOST";
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break;
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case DSERR_INVALIDCALL:
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err = "DSERR_INVALIDCALL";
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break;
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case DSERR_INVALIDPARAM:
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err = "DSERR_INVALIDPARAM";
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break;
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case DSERR_PRIOLEVELNEEDED:
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err = "DSERR_PRIOLEVELNEEDED";
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break;
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default:
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err = NULL;
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}
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if (err)
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{
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SSNES_WARN("[DirectSound error]: %s\n", err);
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return false;
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}
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return true;
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}
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static inline void release_region(dsound_t *ds, const struct audio_lock *region)
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{
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IDirectSoundBuffer_Unlock(ds->dsb, region->chunk1, region->size1, region->chunk2, region->size2);
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}
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static DWORD CALLBACK dsound_thread(PVOID data)
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{
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dsound_t *ds = data;
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SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
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unsigned buffer_mask = ds->buffer_size - 1;
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DWORD write_ptr;
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get_positions(ds, NULL, &write_ptr);
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write_ptr = (write_ptr + ds->buffer_size / 2) & buffer_mask;
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while (ds->thread_alive)
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{
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DWORD read_ptr;
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get_positions(ds, &read_ptr, NULL);
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DWORD avail = write_avail(read_ptr, write_ptr, buffer_mask);
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EnterCriticalSection(&ds->crit);
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DWORD fifo_avail = fifo_read_avail(ds->buffer);
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LeaveCriticalSection(&ds->crit);
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// No space to write, or we don't have data in our fifo, but we can wait some time before it underruns ...
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if (avail < CHUNK_SIZE || ((fifo_avail < CHUNK_SIZE) && (avail < ds->buffer_size / 2)))
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{
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Sleep(1);
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// We could opt for using the notification interface,
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// but it is not guaranteed to work, so use high priority sleeping patterns. :(
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}
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else if (fifo_avail < CHUNK_SIZE) // Got space to write, but nothing in FIFO (underrun), fill block with silence.
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{
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struct audio_lock region;
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if (!grab_region(ds, write_ptr, ®ion))
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{
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ds->thread_alive = false;
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SetEvent(ds->event);
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break;
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}
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memset(region.chunk1, 0, region.size1);
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memset(region.chunk2, 0, region.size2);
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release_region(ds, ®ion);
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write_ptr = (write_ptr + region.size1 + region.size2) & buffer_mask;
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}
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else // All is good. Pull from it and notify FIFO :D
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{
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struct audio_lock region;
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if (!grab_region(ds, write_ptr, ®ion))
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{
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ds->thread_alive = false;
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SetEvent(ds->event);
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break;
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}
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EnterCriticalSection(&ds->crit);
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if (region.chunk1)
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fifo_read(ds->buffer, region.chunk1, region.size1);
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if (region.chunk2)
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fifo_read(ds->buffer, region.chunk2, region.size2);
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LeaveCriticalSection(&ds->crit);
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release_region(ds, ®ion);
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write_ptr = (write_ptr + region.size1 + region.size2) & buffer_mask;
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SetEvent(ds->event);
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}
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}
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ExitThread(0);
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}
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static void dsound_stop_thread(dsound_t *ds)
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{
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if (ds->thread)
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{
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ds->thread_alive = false;
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WaitForSingleObject(ds->thread, INFINITE);
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CloseHandle(ds->thread);
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ds->thread = NULL;
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}
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}
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static bool dsound_start_thread(dsound_t *ds)
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{
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if (!ds->thread)
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{
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ds->thread_alive = true;
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ds->thread = CreateThread(NULL, 0, dsound_thread, ds, 0, NULL);
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if (ds->thread == NULL)
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return false;
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}
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return true;
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}
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static void dsound_clear_buffer(dsound_t *ds)
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{
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IDirectSoundBuffer_SetCurrentPosition(ds->dsb, 0);
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void *ptr;
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DWORD size;
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if (IDirectSoundBuffer_Lock(ds->dsb, 0, 0, &ptr, &size, NULL, NULL, DSBLOCK_ENTIREBUFFER) == DS_OK)
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{
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memset(ptr, 0, size);
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IDirectSoundBuffer_Unlock(ds->dsb, ptr, size, NULL, 0);
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}
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}
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static void dsound_free(void *data)
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{
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dsound_t *ds = data;
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if (ds)
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{
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if (ds->thread)
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{
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ds->thread_alive = false;
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WaitForSingleObject(ds->thread, INFINITE);
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CloseHandle(ds->thread);
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}
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DeleteCriticalSection(&ds->crit);
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if (ds->dsb)
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{
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IDirectSoundBuffer_Stop(ds->dsb);
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IDirectSoundBuffer_Release(ds->dsb);
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}
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if (ds)
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IDirectSound_Release(ds->ds);
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if (ds->event)
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CloseHandle(ds->event);
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if (ds->buffer)
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fifo_free(ds->buffer);
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free(ds);
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}
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}
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static void* dsound_init(const char *device, unsigned rate, unsigned latency)
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{
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dsound_t *ds = calloc(1, sizeof(*ds));
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if (!ds)
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goto error;
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InitializeCriticalSection(&ds->crit);
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if (DirectSoundCreate(NULL, &ds->ds, NULL) != DS_OK)
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goto error;
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if (IDirectSound_SetCooperativeLevel(ds->ds, GetDesktopWindow(), DSSCL_PRIORITY) != DS_OK)
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goto error;
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WAVEFORMATEX wfx = {
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.wFormatTag = WAVE_FORMAT_PCM,
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.nChannels = 2,
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.nSamplesPerSec = rate,
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.wBitsPerSample = 16,
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.nBlockAlign = 2 * sizeof(int16_t),
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.nAvgBytesPerSec = rate * 2 * sizeof(int16_t),
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};
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ds->buffer_size = next_pow2((latency * wfx.nAvgBytesPerSec) / 1000);
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SSNES_LOG("[DirectSound]: Setting buffer size of %u bytes\n", ds->buffer_size);
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SSNES_LOG("[DirectSound]: Latency = %u ms\n", (unsigned)((1000 * ds->buffer_size) / wfx.nAvgBytesPerSec));
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DSBUFFERDESC bufdesc = {
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.dwSize = sizeof(DSBUFFERDESC),
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.dwFlags = DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS_GLOBALFOCUS,
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.dwBufferBytes = ds->buffer_size,
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.lpwfxFormat = &wfx,
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};
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ds->event = CreateEvent(NULL, false, false, NULL);
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if (!ds->event)
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goto error;
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ds->buffer = fifo_new(4 * 1024);
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if (!ds->buffer)
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goto error;
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if (IDirectSound_CreateSoundBuffer(ds->ds, &bufdesc, &ds->dsb, 0) != DS_OK)
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goto error;
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IDirectSoundBuffer_SetCurrentPosition(ds->dsb, 0);
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dsound_clear_buffer(ds);
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if (IDirectSoundBuffer_Play(ds->dsb, 0, 0, DSBPLAY_LOOPING) != DS_OK)
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goto error;
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if (!dsound_start_thread(ds))
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goto error;
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return ds;
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error:
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SSNES_ERR("[DirectSound] Error occured in init!\n");
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dsound_free(ds);
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return NULL;
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}
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static bool dsound_stop(void *data)
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{
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dsound_t *ds = data;
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dsound_stop_thread(ds);
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return IDirectSoundBuffer_Stop(ds->dsb) == DS_OK;
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}
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static bool dsound_start(void *data)
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{
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dsound_t *ds = data;
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dsound_clear_buffer(ds);
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if (!dsound_start_thread(ds))
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return false;
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return IDirectSoundBuffer_Play(ds->dsb, 0, 0, DSBPLAY_LOOPING) == DS_OK;
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}
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static void dsound_set_nonblock_state(void *data, bool state)
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{
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dsound_t *ds = data;
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ds->nonblock = state;
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}
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static ssize_t dsound_write(void *data, const void *buf_, size_t size)
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{
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dsound_t *ds = data;
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const uint8_t *buf = buf_;
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if (!ds->thread_alive)
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return -1;
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size_t written = 0;
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while (size > 0)
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{
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EnterCriticalSection(&ds->crit);
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size_t avail = fifo_write_avail(ds->buffer);
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if (avail > size)
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avail = size;
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fifo_write(ds->buffer, buf, avail);
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LeaveCriticalSection(&ds->crit);
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buf += avail;
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size -= avail;
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written += avail;
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if (ds->nonblock || !ds->thread_alive)
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break;
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if (avail == 0)
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WaitForSingleObject(ds->event, INFINITE);
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}
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return written;
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}
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const audio_driver_t audio_dsound = {
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.init = dsound_init,
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.write = dsound_write,
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.stop = dsound_stop,
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.start = dsound_start,
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.set_nonblock_state = dsound_set_nonblock_state,
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.free = dsound_free,
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.ident = "dsound"
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};
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