4 Support for the ALSA 1.0.1 sound driver
6 Copyright (C) 1999,2000 contributors of the QuakeForge project
7 Please see the file "AUTHORS" for a list of contributors
9 This program is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2
12 of the License, or (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 See the GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to:
23 Free Software Foundation, Inc.
24 59 Temple Place - Suite 330
25 Boston, MA 02111-1307, USA
29 #include <alsa/asoundlib.h>
33 static int snd_inited;
34 static int snd_blocked = 0;
35 static snd_pcm_uframes_t buffer_size;
37 static const char *pcmname = NULL;
38 static snd_pcm_t *pcm;
40 qboolean SNDDMA_Init (void)
43 int bps = -1, stereo = -1;
44 unsigned int rate = 0;
45 snd_pcm_hw_params_t *hw;
46 snd_pcm_sw_params_t *sw;
47 snd_pcm_uframes_t frag_size;
49 snd_pcm_hw_params_alloca (&hw);
50 snd_pcm_sw_params_alloca (&sw);
52 if ((i=COM_CheckParm("-sndpcm"))!=0)
53 pcmname=com_argv[i+1];
57 if ((i=COM_CheckParm("-sndbits")) != 0)
59 bps = atoi(com_argv[i+1]);
60 if (bps != 16 && bps != 8)
62 Con_Printf("Error: invalid sample bits: %d\n", bps);
67 if ((i=COM_CheckParm("-sndspeed")) != 0)
69 rate = atoi(com_argv[i+1]);
70 if (rate!=44100 && rate!=22050 && rate!=11025)
72 Con_Printf("Error: invalid sample rate: %d\n", rate);
77 if ((i=COM_CheckParm("-sndmono")) != 0)
79 if ((i=COM_CheckParm("-sndstereo")) != 0)
82 err = snd_pcm_open (&pcm, pcmname, SND_PCM_STREAM_PLAYBACK,
85 Sys_Printf ("Error: audio open error: %s\n", snd_strerror (err));
88 Sys_Printf ("ALSA: Using PCM %s.\n", pcmname);
90 err = snd_pcm_hw_params_any (pcm, hw);
92 Sys_Printf ("ALSA: error setting hw_params_any. %s\n",
97 err = snd_pcm_hw_params_set_access (pcm, hw,
98 SND_PCM_ACCESS_MMAP_INTERLEAVED);
100 Sys_Printf ("ALSA: Failure to set noninterleaved PCM access. %s\n"
101 "Note: Interleaved is not supported\n",
108 err = snd_pcm_hw_params_set_format (pcm, hw,
112 } else if (0 <= (err = snd_pcm_hw_params_set_format (pcm, hw,
113 SND_PCM_FORMAT_U8))) {
116 Sys_Printf ("ALSA: no useable formats. %s\n",
123 err = snd_pcm_hw_params_set_format (pcm, hw, bps == 8 ?
127 Sys_Printf ("ALSA: no usable formats. %s\n",
133 Sys_Printf ("ALSA: desired format not supported\n");
139 err = snd_pcm_hw_params_set_channels (pcm, hw, 2);
142 } else if (0 <= (err = snd_pcm_hw_params_set_channels (pcm, hw,
146 Sys_Printf ("ALSA: no usable channels. %s\n",
153 err = snd_pcm_hw_params_set_channels (pcm, hw, stereo ? 2 : 1);
155 Sys_Printf ("ALSA: no usable channels. %s\n",
161 Sys_Printf ("ALSA: desired channels not supported\n");
168 err = snd_pcm_hw_params_set_rate_near (pcm, hw, &rate, 0);
170 frag_size = 32 * bps;
173 err = snd_pcm_hw_params_set_rate_near (pcm, hw, &rate, 0);
175 frag_size = 16 * bps;
178 err = snd_pcm_hw_params_set_rate_near (pcm, hw, &rate,
183 Sys_Printf ("ALSA: no usable rates. %s\n",
193 err = snd_pcm_hw_params_set_rate_near (pcm, hw, &rate, 0);
195 Sys_Printf ("ALSA: desired rate %i not supported. %s\n", rate,
199 frag_size = 8 * bps * rate / 11025;
202 Sys_Printf ("ALSA: desired rate %i not supported.\n", rate);
206 err = snd_pcm_hw_params_set_period_size_near (pcm, hw, &frag_size, 0);
208 Sys_Printf ("ALSA: unable to set period size near %i. %s\n",
209 (int) frag_size, snd_strerror (err));
212 err = snd_pcm_hw_params (pcm, hw);
214 Sys_Printf ("ALSA: unable to install hw params: %s\n",
218 err = snd_pcm_sw_params_current (pcm, sw);
220 Sys_Printf ("ALSA: unable to determine current sw params. %s\n",
224 err = snd_pcm_sw_params_set_start_threshold (pcm, sw, ~0U);
226 Sys_Printf ("ALSA: unable to set playback threshold. %s\n",
230 err = snd_pcm_sw_params_set_stop_threshold (pcm, sw, ~0U);
232 Sys_Printf ("ALSA: unable to set playback stop threshold. %s\n",
236 err = snd_pcm_sw_params (pcm, sw);
238 Sys_Printf ("ALSA: unable to install sw params. %s\n",
243 shm->format.channels = stereo + 1;
245 shm->format.width = bps / 8;
247 err = snd_pcm_hw_params_get_buffer_size (hw, &buffer_size);
249 Sys_Printf ("ALSA: unable to get buffer size. %s\n",
254 shm->samples = buffer_size * shm->format.channels; // mono samples in buffer
255 shm->format.speed = rate;
256 SNDDMA_GetDMAPos (); // sets shm->buffer
266 int SNDDMA_GetDMAPos (void)
268 const snd_pcm_channel_area_t *areas;
269 snd_pcm_uframes_t offset;
270 snd_pcm_uframes_t nframes = shm->samples/shm->format.channels;
275 snd_pcm_avail_update (pcm);
276 snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
277 offset *= shm->format.channels;
278 nframes *= shm->format.channels;
279 shm->samplepos = offset;
280 shm->buffer = areas->addr;
281 return shm->samplepos;
284 void SNDDMA_Shutdown (void)
295 Send sound to device if buffer isn't really the dma buffer
297 void SNDDMA_Submit (void)
300 int count = paintedtime - soundtime;
301 const snd_pcm_channel_area_t *areas;
302 snd_pcm_uframes_t nframes;
303 snd_pcm_uframes_t offset;
308 nframes = count / shm->format.channels;
310 snd_pcm_avail_update (pcm);
311 snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
313 state = snd_pcm_state (pcm);
316 case SND_PCM_STATE_PREPARED:
317 snd_pcm_mmap_commit (pcm, offset, nframes);
320 case SND_PCM_STATE_RUNNING:
321 snd_pcm_mmap_commit (pcm, offset, nframes);
328 void *S_LockBuffer(void)
333 void S_UnlockBuffer(void)