diff options
Diffstat (limited to 'backends/dc/audio.cpp')
-rw-r--r-- | backends/dc/audio.cpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/backends/dc/audio.cpp b/backends/dc/audio.cpp new file mode 100644 index 0000000000..863c1e97ac --- /dev/null +++ b/backends/dc/audio.cpp @@ -0,0 +1,86 @@ +/* ScummVM - Scumm Interpreter + * Dreamcast port + * Copyright (C) 2002 Marcus Comstedt + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + * + */ + +#include "stdafx.h" +#include "scumm.h" +#include "dc.h" + +EXTERN_C void *memcpy4(void *s1, const void *s2, unsigned int n); + +void initSound() +{ + stop_sound(); + do_sound_command(CMD_SET_FREQ_EXP(FREQ_22050_EXP)); + do_sound_command(CMD_SET_BUFFER(3)); +} + +bool OSystem_Dreamcast::set_sound_proc(void *param, SoundProc *proc, + byte format) +{ +#if SAMPLE_MODE == 0 + assert(format == SOUND_16BIT); +#elif SAMPLE_MODE == 1 + assert(format == SOUND_8BIT); +#else +#error Invalid SAMPLE_MODE +#endif + _sound_proc_param = param; + _sound_proc = proc; + + return true; +} + +void OSystem_Dreamcast::checkSound() +{ + int n; + int curr_ring_buffer_samples; + + if(read_sound_int(&SOUNDSTATUS->mode) != MODE_PLAY) + start_sound(); + + curr_ring_buffer_samples = read_sound_int(&SOUNDSTATUS->ring_length); + + n = read_sound_int(&SOUNDSTATUS->samplepos); + + if((n-=fillpos)<0) + n += curr_ring_buffer_samples; + + n = ADJUST_BUFFER_SIZE(n-10); + + if(n<100) + return; + + _sound_proc(_sound_proc_param, (byte*)temp_sound_buffer, + SAMPLES_TO_BYTES(n)); + + if(fillpos+n > curr_ring_buffer_samples) { + int r = curr_ring_buffer_samples - fillpos; + memcpy4(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(r)); + fillpos = 0; + n -= r; + memcpy4(RING_BUF, temp_sound_buffer+r, SAMPLES_TO_BYTES(n)); + } else { + memcpy4(RING_BUF+fillpos, temp_sound_buffer, SAMPLES_TO_BYTES(n)); + } + if((fillpos += n) >= curr_ring_buffer_samples) + fillpos = 0; +} |