mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-11 15:51:36 +00:00
156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
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snd_mem.c
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sound caching
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Copyright (C) 1996-1997 Id Software, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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static __attribute__ ((used)) const char rcsid[] =
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"$Id$";
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include <samplerate.h>
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#include "QF/cvar.h"
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#include "QF/dstring.h"
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#include "QF/sound.h"
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#include "QF/sys.h"
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#include "QF/qendian.h"
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#include "QF/quakefs.h"
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#include "compat.h"
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#include "snd_render.h"
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static void
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check_buffer_integrity (sfxbuffer_t *sc, int width, const char *func)
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{
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byte *x = (byte *) sc->data + sc->length * width;
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if (memcmp (x, "\xde\xad\xbe\xef", 4))
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Sys_Error ("%s screwed the pooch %02x%02x%02x%02x", func,
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x[0], x[1], x[2], x[3]);
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}
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void
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SND_Resample (sfxbuffer_t *sc, float *data, int length)
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{
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int outcount;
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double stepscale;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inrate = info->rate;
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int outwidth;
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SRC_DATA src_data;
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stepscale = (double) snd_shm->speed / inrate;
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outcount = length * stepscale;
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src_data.data_in = data;
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src_data.data_out = sc->data + sc->head * sc->channels;
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src_data.input_frames = length;
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src_data.output_frames = outcount;
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src_data.src_ratio = stepscale;
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src_simple (&src_data, SRC_LINEAR, sc->channels);
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outwidth = info->channels * sizeof (float);
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check_buffer_integrity (sc, outwidth, __FUNCTION__);
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}
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static int
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SND_ResampleStream (sfxbuffer_t *sc, float *data, int length)
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{
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SRC_DATA src_data;
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SRC_STATE *state = (SRC_STATE *) sc->sfx->data.stream->state;
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int outcount;
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double stepscale;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inrate = info->rate;
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stepscale = (double) snd_shm->speed / inrate;
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outcount = length * stepscale;
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src_data.data_in = data;
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src_data.data_out = sc->data + sc->head * sc->channels;
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src_data.input_frames = length;
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src_data.output_frames = outcount;
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src_data.src_ratio = stepscale;
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src_data.end_of_input = 0; //XXX
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src_process (state, &src_data);
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return src_data.output_frames_gen;
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}
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void
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SND_SetupResampler (sfxbuffer_t *sc, int streamed)
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{
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double stepscale;
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wavinfo_t *info = sc->sfx->wavinfo (sc->sfx);
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int inrate = info->rate;
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stepscale = (double) snd_shm->speed / inrate;
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sc->sfx->length = info->frames * stepscale;
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if (info->loopstart != (unsigned int)-1)
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sc->sfx->loopstart = info->loopstart * stepscale;
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else
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sc->sfx->loopstart = (unsigned int)-1;
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sc->channels = info->channels;
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if (streamed) {
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int err;
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sfxstream_t *stream = sc->sfx->data.stream;
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if (snd_shm->speed == inrate) {
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stream->state = 0;
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stream->resample = 0;
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} else {
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stream->state = src_new (SRC_LINEAR, info->channels, &err);
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stream->resample = SND_ResampleStream;
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}
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}
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}
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void
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SND_Convert (byte *idata, float *fdata, int frames, int channels, int width)
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{
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int i;
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if (width == 1) {
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for (i = 0; i < frames * channels; i++)
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*fdata++ = (*idata++ - 0x80) / 128.0;
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} else if (width == 2) {
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short *id = (short *) idata;
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for (i = 0; i < frames * channels; i++)
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*fdata++ = *id++ / 32768.0;
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}
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}
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