static ALCboolean alsa_reset_playback(ALCdevice *device)
{
alsa_data *data = (alsa_data*)device->ExtraData;
snd_pcm_uframes_t periodSizeInFrames;
snd_pcm_sw_params_t *sp = NULL;
snd_pcm_hw_params_t *p = NULL;
snd_pcm_access_t access;
unsigned int periods;
unsigned int rate;
int allowmmap;
char *err;
int i;
switch(aluBytesFromFormat(device->Format))
{
case 1:
data->format = SND_PCM_FORMAT_U8;
break;
case 2:
data->format = SND_PCM_FORMAT_S16;
break;
case 4:
data->format = SND_PCM_FORMAT_FLOAT;
break;
default:
AL_PRINT("Unknown format: 0x%x\n", device->Format);
return ALC_FALSE;
}
allowmmap = GetConfigValueBool("alsa", "mmap", 1);
periods = device->NumUpdates;
periodSizeInFrames = device->UpdateSize;
rate = device->Frequency;
err = NULL;
psnd_pcm_hw_params_malloc(&p);
if((i=psnd_pcm_hw_params_any(data->pcmHandle, p)) < 0)
err = "any";
/* set interleaved access */
if(err == NULL && (!allowmmap || (i=psnd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0))
{
if(periods > 2) periods--;
if((i=psnd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
err = "set access";
}
/* set format (implicitly sets sample bits) */
if(err == NULL && (i=psnd_pcm_hw_params_set_format(data->pcmHandle, p, data->format)) < 0)
err = "set format";
/* set channels (implicitly sets frame bits) */
if(err == NULL && (i=psnd_pcm_hw_params_set_channels(data->pcmHandle, p, aluChannelsFromFormat(device->Format))) < 0)
err = "set channels";
/* set periods (implicitly constrains period/buffer parameters) */
if(err == NULL && (i=psnd_pcm_hw_params_set_periods_near(data->pcmHandle, p, &periods, NULL)) < 0)
err = "set periods near";
/* set rate (implicitly constrains period/buffer parameters) */
if(err == NULL && (i=psnd_pcm_hw_params_set_rate_near(data->pcmHandle, p, &rate, NULL)) < 0)
err = "set rate near";
/* set period size in frame units (implicitly sets buffer size/bytes/time and period time/bytes) */
if(err == NULL && (i=psnd_pcm_hw_params_set_period_size_near(data->pcmHandle, p, &periodSizeInFrames, NULL)) < 0)
err = "set period size near";
/* install and prepare hardware configuration */
if(err == NULL && (i=psnd_pcm_hw_params(data->pcmHandle, p)) < 0)
err = "set params";
if(err == NULL && (i=psnd_pcm_hw_params_get_access(p, &access)) < 0)
err = "get access";
if(err == NULL && (i=psnd_pcm_hw_params_get_period_size(p, &periodSizeInFrames, NULL)) < 0)
err = "get period size";
if(err == NULL && (i=psnd_pcm_hw_params_get_periods(p, &periods, NULL)) < 0)
err = "get periods";
if(err != NULL)
{
AL_PRINT("%s failed: %s\n", err, psnd_strerror(i));
psnd_pcm_hw_params_free(p);
return ALC_FALSE;
}
psnd_pcm_hw_params_free(p);
err = NULL;
psnd_pcm_sw_params_malloc(&sp);
if((i=psnd_pcm_sw_params_current(data->pcmHandle, sp)) != 0)
err = "sw current";
if(err == NULL && (i=psnd_pcm_sw_params_set_avail_min(data->pcmHandle, sp, periodSizeInFrames)) != 0)
err = "sw set avail min";
if(err == NULL && (i=psnd_pcm_sw_params(data->pcmHandle, sp)) != 0)
err = "sw set params";
if(err != NULL)
{
AL_PRINT("%s failed: %s\n", err, psnd_strerror(i));
psnd_pcm_sw_params_free(sp);
return ALC_FALSE;
}
psnd_pcm_sw_params_free(sp);
data->size = psnd_pcm_frames_to_bytes(data->pcmHandle, periodSizeInFrames);
if(access == SND_PCM_ACCESS_RW_INTERLEAVED)
{
/* Increase periods by one, since the temp buffer counts as an extra
* period */
periods++;
data->buffer = malloc(data->size);
if(!data->buffer)
{
AL_PRINT("buffer malloc failed\n");
return ALC_FALSE;
}
data->thread = StartThread(ALSANoMMapProc, device);
}
else
{
i = psnd_pcm_prepare(data->pcmHandle);
if(i < 0)
{
AL_PRINT("prepare error: %s\n", psnd_strerror(i));
free(data->buffer);
data->buffer = NULL;
return ALC_FALSE;
}
data->thread = StartThread(ALSAProc, device);
}
if(data->thread == NULL)
{
AL_PRINT("Could not create playback thread\n");
free(data->buffer);
data->buffer = NULL;
return ALC_FALSE;
}
device->UpdateSize = periodSizeInFrames;
device->NumUpdates = periods;
device->Frequency = rate;
return ALC_TRUE;
}
static qboolean QDECL ALSA_InitCard (soundcardinfo_t *sc, const char *pcmname)
{
snd_pcm_t *pcm;
snd_pcm_uframes_t buffer_size;
int err;
snd_pcm_hw_params_t *hw;
snd_pcm_sw_params_t *sw;
#if 0
int bps, stereo;
unsigned int rate;
snd_pcm_uframes_t frag_size;
#endif
qboolean mmap = false;
if (!Alsa_InitAlsa())
{
Con_Printf(CON_ERROR "Alsa does not appear to be installed or compatible\n");
return false;
}
hw = alloca(psnd_pcm_hw_params_sizeof());
sw = alloca(psnd_pcm_sw_params_sizeof());
memset(sw, 0, psnd_pcm_sw_params_sizeof());
memset(hw, 0, psnd_pcm_hw_params_sizeof());
//WARNING: 'default' as the default sucks arse. it adds about a second's worth of lag.
if (!pcmname)
pcmname = "default";
sc->inactive_sound = true; //linux sound devices always play sound, even when we're not the active app...
Con_Printf("Initing ALSA sound device \"%s\"\n", pcmname);
err = psnd_pcm_open (&pcm, pcmname, SND_PCM_STREAM_PLAYBACK,
SND_PCM_NONBLOCK);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA Error: open error (%s): %s\n", pcmname, psnd_strerror (err));
return 0;
}
Con_Printf ("ALSA: Using PCM %s.\n", pcmname);
#if 1
err = psnd_pcm_set_params(pcm, ((sc->sn.samplebits==8)?SND_PCM_FORMAT_U8:SND_PCM_FORMAT_S16), (mmap?SND_PCM_ACCESS_MMAP_INTERLEAVED:SND_PCM_ACCESS_RW_INTERLEAVED), sc->sn.numchannels, sc->sn.speed, true, 0.04*1000000);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA: error setting params. %s\n", psnd_strerror (err));
goto error;
}
// sc->sn.numchannels = stereo;
// sc->sn.samplepos = 0;
// sc->sn.samplebits = bps;
sc->samplequeue = buffer_size = 2048;
#else
err = psnd_pcm_hw_params_any (pcm, hw);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA: error setting hw_params_any. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_hw_params_set_access (pcm, hw, mmap?SND_PCM_ACCESS_MMAP_INTERLEAVED:SND_PCM_ACCESS_RW_INTERLEAVED);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA: Failure to set interleaved PCM access. %s\n", psnd_strerror (err));
goto error;
}
// get sample bit size
bps = sc->sn.samplebits;
{
snd_pcm_format_t spft;
if (bps == 16)
spft = SND_PCM_FORMAT_S16;
else
spft = SND_PCM_FORMAT_U8;
err = psnd_pcm_hw_params_set_format (pcm, hw, spft);
while (err < 0)
{
if (spft == SND_PCM_FORMAT_S16)
{
bps = 8;
spft = SND_PCM_FORMAT_U8;
}
else
{
Con_Printf (CON_ERROR "ALSA: no usable formats. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_hw_params_set_format (pcm, hw, spft);
}
}
// get speaker channels
stereo = sc->sn.numchannels;
err = psnd_pcm_hw_params_set_channels (pcm, hw, stereo);
while (err < 0)
{
if (stereo > 2)
stereo = 2;
else if (stereo > 1)
stereo = 1;
else
{
Con_Printf (CON_ERROR "ALSA: no usable number of channels. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_hw_params_set_channels (pcm, hw, stereo);
}
// get rate
rate = sc->sn.speed;
err = psnd_pcm_hw_params_set_rate_near (pcm, hw, &rate, 0);
while (err < 0)
{
if (rate > 48000)
rate = 48000;
else if (rate > 44100)
rate = 44100;
else if (rate > 22150)
rate = 22150;
else if (rate > 11025)
rate = 11025;
else if (rate > 800)
rate = 800;
else
{
Con_Printf (CON_ERROR "ALSA: no usable rates. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_hw_params_set_rate_near (pcm, hw, &rate, 0);
}
if (rate > 11025)
frag_size = 8 * bps * rate / 11025;
else
frag_size = 8 * bps;
err = psnd_pcm_hw_params_set_period_size_near (pcm, hw, &frag_size, 0);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA: unable to set period size near %i. %s\n", (int) frag_size, psnd_strerror (err));
goto error;
}
err = psnd_pcm_hw_params (pcm, hw);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to install hw params: %s\n",
psnd_strerror (err));
goto error;
}
err = psnd_pcm_sw_params_current (pcm, sw);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to determine current sw params. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_sw_params_set_start_threshold (pcm, sw, ~0U);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to set playback threshold. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_sw_params_set_stop_threshold (pcm, sw, ~0U);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to set playback stop threshold. %s\n", psnd_strerror (err));
goto error;
}
err = psnd_pcm_sw_params (pcm, sw);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to install sw params. %s\n", psnd_strerror (err));
goto error;
}
sc->sn.numchannels = stereo;
sc->sn.samplepos = 0;
sc->sn.samplebits = bps;
buffer_size = sc->sn.samples / stereo;
if (buffer_size)
{
err = psnd_pcm_hw_params_set_buffer_size_near(pcm, hw, &buffer_size);
if (err < 0)
{
Con_Printf (CON_ERROR "ALSA: unable to set buffer size. %s\n", psnd_strerror (err));
goto error;
}
}
err = psnd_pcm_hw_params_get_buffer_size (hw, &buffer_size);
if (0 > err) {
Con_Printf (CON_ERROR "ALSA: unable to get buffer size. %s\n", psnd_strerror (err));
goto error;
}
sc->sn.speed = rate;
#endif
sc->sn.samples = buffer_size * sc->sn.numchannels; // mono samples in buffer
sc->handle = pcm;
sc->Lock = ALSA_LockBuffer;
sc->Unlock = ALSA_UnlockBuffer;
sc->Shutdown = ALSA_Shutdown;
if (mmap)
{
sc->GetDMAPos = ALSA_MMap_GetDMAPos;
sc->Submit = ALSA_MMap_Submit;
sc->GetDMAPos(sc); // sets shm->buffer
//alsa doesn't seem to like high mixahead values
//(maybe it tells us above somehow...)
//so force it lower
//quake's default of 0.2 was for 10fps rendering anyway
//so force it down to 0.1 which is the default for halflife at least, and should give better latency
{
extern cvar_t _snd_mixahead;
if (_snd_mixahead.value >= 0.2)
{
Con_Printf("Alsa Hack: _snd_mixahead forced lower\n");
_snd_mixahead.value = 0.1;
}
}
}
else
{
sc->GetDMAPos = ALSA_RW_GetDMAPos;
sc->Submit = ALSA_RW_Submit;
sc->samplequeue = sc->sn.samples;
sc->sn.buffer = malloc(sc->sn.samples * (sc->sn.samplebits/8));
err = psnd_pcm_prepare(pcm);
if (0 > err)
{
Con_Printf (CON_ERROR "ALSA: unable to prepare for use. %s\n", psnd_strerror (err));
goto error;
}
}
return true;
error:
psnd_pcm_close (pcm);
return false;
}