diff options
Diffstat (limited to 'plugins/dfsound/alsa.c')
| -rw-r--r-- | plugins/dfsound/alsa.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/plugins/dfsound/alsa.c b/plugins/dfsound/alsa.c new file mode 100644 index 0000000..2eba878 --- /dev/null +++ b/plugins/dfsound/alsa.c @@ -0,0 +1,158 @@ +/*************************************************************************** + alsa.c - description + ------------------- + begin : Sat Mar 01 2003 + copyright : (C) 2002 by Pete Bernert + email : BlackDove@addcom.de + ***************************************************************************/ +/*************************************************************************** + * * + * 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. See also the license.txt file for * + * additional informations. * + * * + ***************************************************************************/ + +#include "stdafx.h" + +#define _IN_OSS + +#include "externals.h" + +#define ALSA_PCM_NEW_HW_PARAMS_API +#define ALSA_PCM_NEW_SW_PARAMS_API +#include <alsa/asoundlib.h> + +static snd_pcm_t *handle = NULL; +static snd_pcm_uframes_t buffer_size; + +// SETUP SOUND +void SetupSound(void) +{ + snd_pcm_hw_params_t *hwparams; + snd_pcm_status_t *status; + unsigned int pspeed; + int pchannels; + int format; + unsigned int buffer_time = 100000; + unsigned int period_time = buffer_time / 4; + int err; + + if (iDisStereo) pchannels = 1; + else pchannels=2; + + pspeed = 44100; + format = SND_PCM_FORMAT_S16; + + if ((err = snd_pcm_open(&handle, "default", + SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) + { + printf("Audio open error: %s\n", snd_strerror(err)); + return; + } + + if((err = snd_pcm_nonblock(handle, 0))<0) + { + printf("Can't set blocking moded: %s\n", snd_strerror(err)); + return; + } + + snd_pcm_hw_params_alloca(&hwparams); + + if((err=snd_pcm_hw_params_any(handle, hwparams))<0) + { + printf("Broken configuration for this PCM: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED))<0) + { + printf("Access type not available: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_format(handle, hwparams, format))<0) + { + printf("Sample format not available: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_channels(handle, hwparams, pchannels))<0) + { + printf("Channels count not available: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_rate_near(handle, hwparams, &pspeed, 0))<0) + { + printf("Rate not available: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0))<0) + { + printf("Buffer time error: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0))<0) + { + printf("Period time error: %s\n", snd_strerror(err)); + return; + } + + if((err=snd_pcm_hw_params(handle, hwparams))<0) + { + printf("Unable to install hw params: %s\n", snd_strerror(err)); + return; + } + + snd_pcm_status_alloca(&status); + if((err=snd_pcm_status(handle, status))<0) + { + printf("Unable to get status: %s\n", snd_strerror(err)); + return; + } + + buffer_size = snd_pcm_status_get_avail(status); +} + +// REMOVE SOUND +void RemoveSound(void) +{ + if(handle != NULL) + { + snd_pcm_drop(handle); + snd_pcm_close(handle); + handle = NULL; + } +} + +// GET BYTES BUFFERED +unsigned long SoundGetBytesBuffered(void) +{ + unsigned long l; + + if (handle == NULL) // failed to open? + return SOUNDSIZE; + l = snd_pcm_avail(handle); + if (l < 0) return 0; + if (l < buffer_size / 2) // can we write in at least the half of fragments? + l = SOUNDSIZE; // -> no? wait + else l = 0; // -> else go on + + return l; +} + +// FEED SOUND DATA +void SoundFeedStreamData(unsigned char* pSound,long lBytes) +{ + if (handle == NULL) return; + + if (snd_pcm_state(handle) == SND_PCM_STATE_XRUN) + snd_pcm_prepare(handle); + snd_pcm_writei(handle,pSound, + iDisStereo ? lBytes / 2 : lBytes / 4); +} |