From ee56e1bdc794221e223424a6b79f4c86c4b977e1 Mon Sep 17 00:00:00 2001
From: despair <despair@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sat, 24 Feb 2001 00:10:10 +0000
Subject: [PATCH] Update to latest ALSA development drivers. (Thanks again to
Abramo)
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@155 d7cf8633-e32d-0410-b094-e92efae38249
---
snd_alsa_0_9.c | 308 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 308 insertions(+)
create mode 100644 snd_alsa_0_9.c
diff --git a/snd_alsa_0_9.c b/snd_alsa_0_9.c
new file mode 100644
index 00000000..5cb3092e
--- /dev/null
+++ b/snd_alsa_0_9.c
@@ -0,0 +1,308 @@
+/*
+ snd_alsa_0_9.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
+
+ $Id$
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+
+#include <sys/asoundlib.h>
+
+#include "qtypes.h"
+#include "sound.h"
+#include "qargs.h"
+#include "console.h"
+
+static int snd_inited;
+
+static snd_pcm_t *pcm;
+static const snd_pcm_channel_area_t *mmap_areas;
+static char *pcmname = NULL;
+size_t buffer_size;
+
+qboolean SNDDMA_Init(void)
+{
+ int err,i;
+ int rate=-1,bps=-1,stereo=-1,frag_size;
+ snd_pcm_hw_params_t *hw;
+ snd_pcm_sw_params_t *sw;
+ snd_pcm_hw_params_alloca(&hw);
+ snd_pcm_sw_params_alloca(&sw);
+
+ if ((i=COM_CheckParm("-sndpcm"))!=0) {
+ pcmname=com_argv[i+1];
+ }
+ if ((i=COM_CheckParm("-sndbits")) != 0) {
+ bps = atoi(com_argv[i+1]);
+ if (bps != 16 && bps != 8) {
+ Con_Printf("Error: invalid sample bits: %d\n", i);
+ return 0;
+ }
+ }
+ if ((i=COM_CheckParm("-sndspeed")) != 0) {
+ rate = atoi(com_argv[i+1]);
+ if (rate!=44100 && rate!=22050 && rate!=11025) {
+ Con_Printf("Error: invalid sample rate: %d\n", rate);
+ return 0;
+ }
+ }
+ if ((i=COM_CheckParm("-sndmono")) != 0) {
+ stereo=0;
+ }
+ if ((i=COM_CheckParm("-sndstereo")) != 0) {
+ stereo=1;
+ }
+ if (!pcmname)
+ pcmname = "plug:0,0";
+ if ((err=snd_pcm_open(&pcm, pcmname,
+ SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK))<0) {
+ Con_Printf("Error: audio open error: %s\n", snd_strerror(err));
+ return 0;
+ }
+
+ Con_Printf("Using PCM %s.\n", pcmname);
+ snd_pcm_hw_params_any(pcm, hw);
+
+
+ switch (rate) {
+ case -1:
+ if (snd_pcm_hw_params_set_rate_near(pcm, hw, 44100, 0) >= 0) {
+ frag_size = 256; /* assuming stereo 8 bit */
+ rate = 44100;
+ } else if (snd_pcm_hw_params_set_rate_near(pcm, hw, 22050, 0) >= 0) {
+ frag_size = 128; /* assuming stereo 8 bit */
+ rate = 22050;
+ } else if (snd_pcm_hw_params_set_rate_near(pcm, hw, 11025, 0) >= 0) {
+ frag_size = 64; /* assuming stereo 8 bit */
+ rate = 11025;
+ } else {
+ Con_Printf("ALSA: no useable rates\n");
+ goto error;
+ }
+ break;
+ case 11025:
+ case 22050:
+ case 44100:
+ if (snd_pcm_hw_params_set_rate_near(pcm, hw, rate, 0) >= 0) {
+ frag_size = 64 * rate / 11025; /* assuming stereo 8 bit */
+ break;
+ }
+ /* Fall through */
+ default:
+ Con_Printf("ALSA: desired rate not supported\n");
+ goto error;
+ }
+
+ switch (bps) {
+ case -1:
+ if (snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_S16_LE) >= 0) {
+ bps = 16;
+ } else if (snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_U8) >= 0) {
+ bps = 8;
+ } else {
+ Con_Printf("ALSA: no useable formats\n");
+ goto error;
+ }
+ break;
+ case 8:
+ case 16:
+ if (snd_pcm_hw_params_set_format(pcm, hw,
+ bps == 8 ? SND_PCM_FORMAT_U8 :
+ SND_PCM_FORMAT_S16) >= 0) {
+ break;
+ }
+ /* Fall through */
+ default:
+ Con_Printf("ALSA: desired format not supported\n");
+ goto error;
+ }
+
+ if (snd_pcm_hw_params_set_access(pcm, hw,
+ SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0) {
+ Con_Printf("ALSA: interleaved is not supported\n");
+ goto error;
+ }
+
+ switch (stereo) {
+ case -1:
+ if (snd_pcm_hw_params_set_channels(pcm, hw, 2) >= 0) {
+ stereo = 1;
+ } else if (snd_pcm_hw_params_set_channels(pcm, hw, 1) >= 0) {
+ stereo = 0;
+ } else {
+ Con_Printf("ALSA: no useable channels\n");
+ goto error;
+ }
+ break;
+ case 0:
+ case 1:
+ if (snd_pcm_hw_params_set_channels(pcm, hw, stereo ? 2 : 1) >= 0)
+ break;
+ /* Fall through */
+ default:
+ Con_Printf("ALSA: desired channels not supported\n");
+ goto error;
+ }
+
+ snd_pcm_hw_params_set_period_size_near(pcm, hw, frag_size, 0);
+
+ err = snd_pcm_hw_params(pcm, hw);
+ if (err < 0) {
+ Con_Printf("ALSA: unable to install hw params\n");
+ goto error;
+ }
+
+ snd_pcm_sw_params_current(pcm, sw);
+ snd_pcm_sw_params_set_start_mode(pcm, sw, SND_PCM_START_EXPLICIT);
+ snd_pcm_sw_params_set_xrun_mode(pcm, sw, SND_PCM_XRUN_NONE);
+
+ err = snd_pcm_sw_params(pcm, sw);
+ if (err < 0) {
+ Con_Printf("ALSA: unable to install sw params\n");
+ goto error;
+ }
+
+ mmap_areas = snd_pcm_mmap_running_areas(pcm);
+
+ shm=&sn;
+ memset((dma_t*)shm,0,sizeof(*shm));
+ shm->splitbuffer = 0;
+ shm->channels=stereo+1;
+ shm->submission_chunk=snd_pcm_hw_params_get_period_size(hw, 0); // don't mix less than this #
+ shm->samplepos=0; // in mono samples
+ shm->samplebits=bps;
+ buffer_size = snd_pcm_hw_params_get_buffer_size(hw);
+ shm->samples=buffer_size*shm->channels; // mono samples in buffer
+ shm->speed=rate;
+ shm->buffer=(unsigned char*)mmap_areas->addr;
+ 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:
+ snd_pcm_close(pcm);
+ return 0;
+}
+
+static inline int
+get_hw_ptr()
+{
+ size_t app_ptr;
+ snd_pcm_sframes_t delay;
+ int hw_ptr;
+
+ if (snd_pcm_state (pcm) != SND_PCM_STATE_RUNNING)
+ return 0;
+ app_ptr = snd_pcm_mmap_offset (pcm);
+ snd_pcm_delay (pcm, &delay);
+ hw_ptr = app_ptr - delay;
+ if (hw_ptr < 0)
+ hw_ptr += buffer_size;
+ return hw_ptr;
+}
+
+int SNDDMA_GetDMAPos(void)
+{
+ int hw_ptr;
+
+ if (!snd_inited) return 0;
+
+ hw_ptr = get_hw_ptr();
+ hw_ptr *= shm->channels;
+ shm->samplepos = hw_ptr;
+ return shm->samplepos;
+}
+
+void SNDDMA_Shutdown(void)
+{
+ if (snd_inited)
+ {
+ snd_pcm_close(pcm);
+ 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 avail;
+ int missed;
+ int state;
+ int hw_ptr;
+ int offset;
+
+ state = snd_pcm_state (pcm);
+
+ switch (state) {
+ case SND_PCM_STATE_PREPARED:
+ snd_pcm_mmap_forward (pcm, count);
+ snd_pcm_start (pcm);
+ break;
+ case SND_PCM_STATE_RUNNING:
+ hw_ptr = get_hw_ptr();
+ missed = hw_ptr - shm->samplepos / shm->channels;
+ if (missed < 0)
+ missed += buffer_size;
+ count -= missed;
+ offset = snd_pcm_mmap_offset (pcm);
+ if (offset > hw_ptr)
+ count -= (offset - hw_ptr);
+ else
+ count -= (buffer_size - hw_ptr + offset);
+ if (count < 0) {
+ snd_pcm_rewind (pcm, -count);
+ } else {
+ avail = snd_pcm_avail_update(pcm);
+ if (avail < 0)
+ avail = buffer_size;
+ if (count > avail)
+ count = avail;
+ snd_pcm_mmap_forward (pcm, count);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
--
2.39.5