From fa198d11f32b788ec406de1845e7c80a2ab06095 Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Tue, 16 May 2000 05:40:02 +0000
Subject: [PATCH] alsa sound support for linux. added now in anticipation of
 autoconf

---
 source/snd_alsa.c | 319 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 319 insertions(+)
 create mode 100644 source/snd_alsa.c

diff --git a/source/snd_alsa.c b/source/snd_alsa.c
new file mode 100644
index 0000000..73cd314
--- /dev/null
+++ b/source/snd_alsa.c
@@ -0,0 +1,319 @@
+/*
+	snd_alsa.c
+
+	(description)
+
+	Copyright (C) 1999,2000  contributors of the QuakeForge project
+	Please see the file "AUTHORS" for a list of contributors
+
+	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:
+
+		Free Software Foundation, Inc.
+		59 Temple Place - Suite 330
+		Boston, MA  02111-1307, USA
+
+	$Id$
+*/
+
+#include <config.h>
+#include <qtypes.h>
+#include <sound.h>
+#include <qargs.h>
+#include <console.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <fcntl.h>
+#include <sys/types.h>
+#ifdef HAVE_SYS_IOCTL_H
+# include <sys/ioctl.h>
+#endif
+#ifdef HAVE_SYS_MMAN_H
+# include <sys/mman.h>
+#endif
+#if defined HAVE_SYS_SOUNDCARD_H
+# include <sys/soundcard.h>
+#elif defined HAVE_LINUX_SOUNDCARD_H
+# include <linux/soundcard.h>
+#elif HAVE_MACHINE_SOUNDCARD_H
+# include <machine/soundcard.h>
+#endif
+
+#include <sys/asoundlib.h>
+
+#ifndef MAP_FAILED
+# define MAP_FAILED ((void*)-1)
+#endif
+
+static int snd_inited;
+
+static snd_pcm_t *pcm_handle;
+static struct snd_pcm_channel_info cinfo;
+static struct snd_pcm_channel_params params;
+static struct snd_pcm_channel_setup setup;
+static snd_pcm_mmap_control_t *mmap_control = NULL;
+static char *mmap_data = NULL;
+static int card=-1,dev=-1;
+
+int check_card(int card)
+{
+	snd_ctl_t *handle;
+	snd_ctl_hw_info_t info;
+	int rc;
+
+	if ((rc = snd_ctl_open(&handle, card)) < 0) {
+		Con_Printf("Error: control open (%i): %s\n", card, snd_strerror(rc));
+		return rc;
+	}
+	if ((rc = snd_ctl_hw_info(handle, &info)) < 0) {
+		Con_Printf("Error: control hardware info (%i): %s\n", card,
+				   snd_strerror(rc));
+		snd_ctl_close(handle);
+		return rc;
+	}
+	snd_ctl_close(handle);
+	if (dev==-1) {
+		for (dev = 0; dev < info.pcmdevs; dev++) {
+			if ((rc=snd_pcm_open(&pcm_handle,card,dev,
+								 SND_PCM_OPEN_PLAYBACK
+								 | SND_PCM_OPEN_NONBLOCK))==0) {
+				return 0;
+			}
+		}
+	} else {
+		if (dev>=0 && dev <info.pcmdevs) {
+			if ((rc=snd_pcm_open(&pcm_handle,card,dev,
+								 SND_PCM_OPEN_PLAYBACK
+								 | SND_PCM_OPEN_NONBLOCK))==0) {
+				return 0;
+			}
+		}
+	}
+	return 1;
+}
+
+qboolean SNDDMA_Init(void)
+{
+	int rc=0,i;
+	char *err_msg="";
+	int rate,format,bps,stereo,frag_size;
+	unsigned int mask;
+
+	mask = snd_cards_mask();
+	if (!mask) {
+		Con_Printf("No sound cards detected\n");
+		return 0;
+	}
+	if ((i=COM_CheckParm("-sndcard"))!=0) {
+		card=atoi(com_argv[i+1]);
+	}
+	if ((i=COM_CheckParm("-snddev"))!=0) {
+		dev=atoi(com_argv[i+1]);
+	}
+	if (card==-1) {
+		for (card=0; card<SND_CARDS; card++) {
+			if (!(mask & (1<<card)))
+				continue;
+			rc=check_card(card);
+			if (rc<0)
+				return 0;
+			if (!rc)
+				goto dev_openned;
+		}
+	} else {
+		if (dev==-1) {
+			rc=check_card(card);
+			if (rc<0)
+				return 0;
+			if (!rc)
+				goto dev_openned;
+		} else {
+			if ((rc=snd_pcm_open(&pcm_handle,card,dev,
+								 SND_PCM_OPEN_PLAYBACK
+								 | SND_PCM_OPEN_NONBLOCK))<0) {
+				Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
+				return 0;
+			}
+			goto dev_openned;
+		}
+	}
+	Con_Printf("Error: audio open error: %s\n", snd_strerror(rc));
+	return 0;
+
+ dev_openned:
+	Con_Printf("Using card %d, device %d.\n", card, dev);
+	memset(&cinfo, 0, sizeof(cinfo));
+	cinfo.channel = SND_PCM_CHANNEL_PLAYBACK;
+	snd_pcm_channel_info(pcm_handle, &cinfo);
+	Con_Printf("%08x %08x %08x\n",cinfo.flags,cinfo.formats,cinfo.rates);
+	if (cinfo.rates & SND_PCM_RATE_44100) {
+		rate=44100;
+		frag_size=512;	/* assuming stereo 8 bit */
+	} else if (cinfo.rates & SND_PCM_RATE_22050) {
+		rate=22050;
+		frag_size=256;	/* assuming stereo 8 bit */
+	} else if (cinfo.rates & SND_PCM_RATE_11025) {
+		rate=11025;
+		frag_size=128;	/* assuming stereo 8 bit */
+	} else {
+		Con_Printf("ALSA: desired rates not supported\n");
+		goto error_2;
+	}
+	if (cinfo.formats & SND_PCM_FMT_S16_LE) {
+		format=SND_PCM_SFMT_S16_LE;
+		bps=16;
+		frag_size*=2;
+	} else if (cinfo.formats & SND_PCM_FMT_U8) {
+		format=SND_PCM_SFMT_U8;
+		bps=8;
+	} else {
+		Con_Printf("ALSA: desired formats not supported\n");
+		goto error_2;
+	}
+	if (cinfo.max_voices>=2) {
+		stereo=1;
+	} else {
+		stereo=0;
+		frag_size/=2;
+	}
+
+//	err_msg="audio flush";
+//	if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
+//		goto error;
+	err_msg="audio munmap";
+	if ((rc=snd_pcm_munmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
+		goto error;
+
+	memset(&params, 0, sizeof(params));
+	params.channel = SND_PCM_CHANNEL_PLAYBACK;
+	params.mode = SND_PCM_MODE_BLOCK;
+	params.format.interleave=1;
+	params.format.format=format;
+	params.format.rate=rate;
+	params.format.voices=stereo+1;
+	params.start_mode = SND_PCM_START_GO;
+	params.stop_mode = SND_PCM_STOP_ROLLOVER;
+	params.buf.block.frag_size=frag_size;
+	params.buf.block.frags_min=1;
+	params.buf.block.frags_max=-1;
+//	err_msg="audio flush";
+//	if ((rc=snd_pcm_channel_flush(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
+//		goto error;
+	err_msg="audio params";
+	if ((rc=snd_pcm_channel_params(pcm_handle, &params))<0)
+		goto error;
+
+	err_msg="audio mmap";
+	if ((rc=snd_pcm_mmap(pcm_handle, SND_PCM_CHANNEL_PLAYBACK, &mmap_control, (void **)&mmap_data))<0)
+		goto error;
+	err_msg="audio prepare";
+	if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0)
+		goto error;
+
+	memset(&setup, 0, sizeof(setup));
+	setup.mode = SND_PCM_MODE_BLOCK;
+	setup.channel = SND_PCM_CHANNEL_PLAYBACK;
+	err_msg="audio setup";
+	if ((rc=snd_pcm_channel_setup(pcm_handle, &setup))<0)
+		goto error;
+
+	shm=&sn;
+	memset((dma_t*)shm,0,sizeof(*shm));
+    shm->splitbuffer = 0;
+	shm->channels=setup.format.voices;
+	shm->submission_chunk=128;					// don't mix less than this #
+	shm->samplepos=0;							// in mono samples
+	shm->samplebits=setup.format.format==SND_PCM_SFMT_S16_LE?16:8;
+	shm->samples=setup.buf.block.frags*setup.buf.block.frag_size/(shm->samplebits/8);	// mono samples in buffer
+	shm->speed=setup.format.rate;
+	shm->buffer=(unsigned char*)mmap_data;
+    Con_Printf("%5d stereo\n", shm->channels - 1);
+    Con_Printf("%5d samples\n", shm->samples);
+    Con_Printf("%5d samplepos\n", shm->samplepos);
+    Con_Printf("%5d samplebits\n", shm->samplebits);
+    Con_Printf("%5d submission_chunk\n", shm->submission_chunk);
+    Con_Printf("%5d speed\n", shm->speed);
+    Con_Printf("0x%x dma buffer\n", (int)shm->buffer);
+	Con_Printf("%5d total_channels\n", total_channels);
+
+	snd_inited=1;
+	return 1;
+ error:
+	Con_Printf("Error: %s: %s\n", err_msg, snd_strerror(rc));
+ error_2:
+	snd_pcm_close(pcm_handle);
+	return 0;
+}
+
+int SNDDMA_GetDMAPos(void)
+{
+	if (!snd_inited) return 0;
+	shm->samplepos=(mmap_control->status.frag_io+1)*setup.buf.block.frag_size/(shm->samplebits/8);
+	return shm->samplepos;
+}
+
+void SNDDMA_Shutdown(void)
+{
+	if (snd_inited)
+	{
+		snd_pcm_close(pcm_handle);
+		snd_inited = 0;
+	}
+}
+
+/*
+==============
+SNDDMA_Submit
+
+Send sound to device if buffer isn't really the dma buffer
+===============
+*/
+void SNDDMA_Submit(void)
+{
+	int count=paintedtime-soundtime;
+	int i,s,e;
+	int rc;
+
+	count+=setup.buf.block.frag_size-1;
+	count/=setup.buf.block.frag_size;
+	s=soundtime/setup.buf.block.frag_size;
+	e=s+count;
+	for (i=s; i<e; i++)
+		mmap_control->fragments[i % setup.buf.block.frags].data=1;
+	switch (mmap_control->status.status) {
+	case SND_PCM_STATUS_PREPARED:
+		if ((rc=snd_pcm_channel_go(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
+			fprintf(stderr, "unable to start playback. %s\n",
+					snd_strerror(rc));
+			exit(1);
+		}
+		break;
+	case SND_PCM_STATUS_RUNNING:
+		break;
+	case SND_PCM_STATUS_UNDERRUN:
+		if ((rc=snd_pcm_plugin_prepare(pcm_handle, SND_PCM_CHANNEL_PLAYBACK))<0) {
+			fprintf(stderr, "underrun: playback channel prepare error. %s\n",
+					snd_strerror(rc));
+			exit(1);
+		}
+		break;
+	default:
+		break;
+	}
+}
+