mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-14 14:41:41 +00:00
287 lines
6.7 KiB
C
287 lines
6.7 KiB
C
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/*
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Copyright (C) 1997-2001 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 the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stropts.h>
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#include <sys/types.h>
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#include <sys/audioio.h>
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#include "../client/client.h"
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#include "../client/snd_loc.h"
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#define SND_DEBUG 0
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#if SND_DEBUG
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#define DPRINTF(...) printf(__VA_ARGS__)
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#else
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#define DPRINTF(...) /**/
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#endif
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static int audio_fd = -1;
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static int snd_inited;
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static cvar_t *sndbits;
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static cvar_t *sndspeed;
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static cvar_t *sndchannels;
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static cvar_t *snddevice;
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static int tryrates[] = { 11025, 22051, 44100, 8000 };
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#define QSND_NUM_CHUNKS 2
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/*
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==================
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SNDDMA_Init
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Try to find a sound device to mix for.
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Returns false if nothing is found.
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Returns true and fills in the "dma" structure with information for the mixer.
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==================
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*/
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qboolean SNDDMA_Init(void)
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{
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int i;
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int samples;
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audio_info_t au_info;
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if (snd_inited)
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return 1;
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if (!snddevice) {
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sndbits = Cvar_Get("sndbits", "16", CVAR_ARCHIVE);
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sndspeed = Cvar_Get("sndspeed", "0", CVAR_ARCHIVE);
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sndchannels = Cvar_Get("sndchannels", "2", CVAR_ARCHIVE);
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snddevice = Cvar_Get("snddevice", "/dev/audio", CVAR_ARCHIVE);
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}
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// open /dev/audio
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if (audio_fd < 0) {
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audio_fd = open(snddevice->string, O_WRONLY);
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if (audio_fd < 0) {
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Com_Printf("Could not open %s: %s\n", snddevice->string, strerror(errno));
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return 0;
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}
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}
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// set sample bits & speed
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if ((int)sndspeed->value > 0) {
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AUDIO_INITINFO(&au_info);
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au_info.play.precision = (int)sndbits->value;
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au_info.play.encoding =
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( au_info.play.precision == 8
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? AUDIO_ENCODING_LINEAR8
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: AUDIO_ENCODING_LINEAR );
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au_info.play.sample_rate = (int)sndspeed->value;
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au_info.play.channels = (int)sndchannels->value;
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if (ioctl(audio_fd, AUDIO_SETINFO, &au_info) == -1) {
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Com_Printf("AUDIO_SETINFO failed: %s\n", strerror(errno));
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return 0;
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}
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} else {
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for (i=0 ; i<sizeof(tryrates)/sizeof(tryrates[0]) ; i++) {
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AUDIO_INITINFO(&au_info);
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au_info.play.precision = (int)sndbits->value;
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au_info.play.encoding =
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( au_info.play.precision == 8
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? AUDIO_ENCODING_LINEAR8
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: AUDIO_ENCODING_LINEAR );
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au_info.play.sample_rate = tryrates[i];
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au_info.play.channels = (int)sndchannels->value;
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if (ioctl(audio_fd, AUDIO_SETINFO, &au_info) == 0)
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break;
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Com_Printf("AUDIO_SETINFO failed: %s\n", strerror(errno));
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}
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if (i >= sizeof(tryrates)/sizeof(tryrates[0]))
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return 0;
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}
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dma.samplebits = au_info.play.precision;
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dma.channels = au_info.play.channels;
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dma.speed = au_info.play.sample_rate;
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/*
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* submit some sound data every ~ 0.1 seconds, and try to buffer 2*0.1
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* seconds in sound driver
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*/
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samples = dma.channels * dma.speed / 10;
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for (i = 0; (1 << i) < samples; i++)
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;
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dma.submission_chunk = 1 << (i-1);
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DPRINTF("channels %d, speed %d, log2(samples) %d, submission chunk %d\n",
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dma.channels, dma.speed, i-1,
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dma.submission_chunk);
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dma.samples = QSND_NUM_CHUNKS * dma.submission_chunk;
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dma.buffer = calloc(dma.samples, dma.samplebits/8);
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if (dma.buffer == NULL) {
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Com_Printf("Could not alloc sound buffer\n");
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return 0;
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}
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AUDIO_INITINFO(&au_info);
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au_info.play.eof = 0;
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au_info.play.samples = 0;
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ioctl(audio_fd, AUDIO_SETINFO, &au_info);
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dma.samplepos = 0;
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snd_inited = 1;
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return 1;
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}
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/*
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==============
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SNDDMA_GetDMAPos
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return the current sample position (in mono samples, not stereo)
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inside the recirculating dma buffer, so the mixing code will know
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how many sample are required to fill it up.
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===============
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*/
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int SNDDMA_GetDMAPos(void)
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{
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int s_pos;
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audio_info_t au_info;
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if (!snd_inited)
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return 0;
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if (ioctl(audio_fd, AUDIO_GETINFO, &au_info) == -1) {
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Com_Printf("AUDIO_GETINFO failed: %s\n", strerror(errno));
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return 0;
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}
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s_pos = au_info.play.samples * dma.channels;
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return s_pos & (dma.samples - 1);
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}
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/*
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==============
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SNDDMA_Shutdown
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Reset the sound device for exiting
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===============
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*/
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void SNDDMA_Shutdown(void)
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{
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if (snd_inited) {
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if (audio_fd >= 0) {
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ioctl(audio_fd, I_FLUSH, FLUSHW);
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close(audio_fd);
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audio_fd = -1;
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}
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snd_inited = 0;
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}
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}
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/*
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==============
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SNDDMA_Submit
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Send sound to device if buffer isn't really the dma buffer
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===============
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*/
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void SNDDMA_Submit(void)
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{
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int samplebytes = dma.samplebits/8;
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audio_info_t au_info;
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int s_pos;
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int chunk_idx;
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static int last_chunk_idx = -1;
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if (!snd_inited)
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return;
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if (last_chunk_idx == -1) {
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if (write(audio_fd, dma.buffer, dma.samples * samplebytes) != dma.samples * samplebytes)
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Com_Printf("initial write on audio device failed\n");
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last_chunk_idx = 0;
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dma.samplepos = 0;
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return;
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}
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if (ioctl(audio_fd, AUDIO_GETINFO, &au_info) == -1) {
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Com_Printf("AUDIO_GETINFO failed: %s\n", strerror(errno));
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return;
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}
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if (au_info.play.error) {
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/*
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* underflow? clear the error flag and reset the HW sample counter
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* and send the whole dma_buffer, to get sound output working again
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*/
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DPRINTF("audio data underflow\n");
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AUDIO_INITINFO(&au_info);
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au_info.play.error = 0;
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au_info.play.samples = 0;
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ioctl(audio_fd, AUDIO_SETINFO, &au_info);
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if (write(audio_fd, dma.buffer, dma.samples * samplebytes) != dma.samples * samplebytes)
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Com_Printf("refill sound driver after underflow failed\n");
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last_chunk_idx = 0;
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dma.samplepos = 0;
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return;
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}
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s_pos = au_info.play.samples * dma.channels;
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chunk_idx = (s_pos % dma.samples) / dma.submission_chunk;
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DPRINTF("HW DMA Pos=%u (%u), dma.samplepos=%u, play in=%d, last=%d\n",
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au_info.play.samples, s_pos, dma.samplepos,
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chunk_idx, last_chunk_idx);
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while (chunk_idx != last_chunk_idx) {
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if (write(audio_fd,
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dma.buffer + dma.samplepos * samplebytes,
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dma.submission_chunk * samplebytes) != dma.submission_chunk * samplebytes) {
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Com_Printf("write error on audio device\n");
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}
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if ((dma.samplepos += dma.submission_chunk) >= dma.samples)
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dma.samplepos = 0;
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if (++last_chunk_idx >= QSND_NUM_CHUNKS)
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last_chunk_idx = 0;
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}
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}
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void SNDDMA_BeginPainting (void)
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{
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}
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