/** * OpenAL cross platform audio library * Copyright (C) 1999-2007 by authors. * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * Or go to http://www.gnu.org/copyleft/lgpl.html */ #include "config.h" #include #include #include #include "alMain.h" #include static const ALCchar alsaDevice[] = "ALSA Default"; static void *alsa_handle; #ifdef HAVE_DYNLOAD #define MAKE_FUNC(f) static typeof(f) * p##f MAKE_FUNC(snd_strerror); MAKE_FUNC(snd_pcm_open); MAKE_FUNC(snd_pcm_close); MAKE_FUNC(snd_pcm_nonblock); MAKE_FUNC(snd_pcm_frames_to_bytes); MAKE_FUNC(snd_pcm_bytes_to_frames); MAKE_FUNC(snd_pcm_hw_params_malloc); MAKE_FUNC(snd_pcm_hw_params_free); MAKE_FUNC(snd_pcm_hw_params_any); MAKE_FUNC(snd_pcm_hw_params_set_access); MAKE_FUNC(snd_pcm_hw_params_set_format); MAKE_FUNC(snd_pcm_hw_params_set_channels); MAKE_FUNC(snd_pcm_hw_params_set_periods_near); MAKE_FUNC(snd_pcm_hw_params_set_rate_near); MAKE_FUNC(snd_pcm_hw_params_set_rate); MAKE_FUNC(snd_pcm_hw_params_set_rate_resample); MAKE_FUNC(snd_pcm_hw_params_set_buffer_time_near); MAKE_FUNC(snd_pcm_hw_params_set_period_time_near); MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_near); MAKE_FUNC(snd_pcm_hw_params_set_period_size_near); MAKE_FUNC(snd_pcm_hw_params_set_buffer_size_min); MAKE_FUNC(snd_pcm_hw_params_get_buffer_size); MAKE_FUNC(snd_pcm_hw_params_get_period_size); MAKE_FUNC(snd_pcm_hw_params_get_access); MAKE_FUNC(snd_pcm_hw_params_get_periods); MAKE_FUNC(snd_pcm_hw_params); MAKE_FUNC(snd_pcm_sw_params_malloc); MAKE_FUNC(snd_pcm_sw_params_current); MAKE_FUNC(snd_pcm_sw_params_set_avail_min); MAKE_FUNC(snd_pcm_sw_params); MAKE_FUNC(snd_pcm_sw_params_free); MAKE_FUNC(snd_pcm_prepare); MAKE_FUNC(snd_pcm_start); MAKE_FUNC(snd_pcm_resume); MAKE_FUNC(snd_pcm_wait); MAKE_FUNC(snd_pcm_state); MAKE_FUNC(snd_pcm_avail_update); MAKE_FUNC(snd_pcm_areas_silence); MAKE_FUNC(snd_pcm_mmap_begin); MAKE_FUNC(snd_pcm_mmap_commit); MAKE_FUNC(snd_pcm_readi); MAKE_FUNC(snd_pcm_writei); MAKE_FUNC(snd_pcm_drain); MAKE_FUNC(snd_pcm_recover); MAKE_FUNC(snd_pcm_info_malloc); MAKE_FUNC(snd_pcm_info_free); MAKE_FUNC(snd_pcm_info_set_device); MAKE_FUNC(snd_pcm_info_set_subdevice); MAKE_FUNC(snd_pcm_info_set_stream); MAKE_FUNC(snd_pcm_info_get_name); MAKE_FUNC(snd_ctl_pcm_next_device); MAKE_FUNC(snd_ctl_pcm_info); MAKE_FUNC(snd_ctl_open); MAKE_FUNC(snd_ctl_close); MAKE_FUNC(snd_ctl_card_info_malloc); MAKE_FUNC(snd_ctl_card_info_free); MAKE_FUNC(snd_ctl_card_info); MAKE_FUNC(snd_ctl_card_info_get_name); MAKE_FUNC(snd_ctl_card_info_get_id); MAKE_FUNC(snd_card_next); #undef MAKE_FUNC #define snd_strerror psnd_strerror #define snd_pcm_open psnd_pcm_open #define snd_pcm_close psnd_pcm_close #define snd_pcm_nonblock psnd_pcm_nonblock #define snd_pcm_frames_to_bytes psnd_pcm_frames_to_bytes #define snd_pcm_bytes_to_frames psnd_pcm_bytes_to_frames #define snd_pcm_hw_params_malloc psnd_pcm_hw_params_malloc #define snd_pcm_hw_params_free psnd_pcm_hw_params_free #define snd_pcm_hw_params_any psnd_pcm_hw_params_any #define snd_pcm_hw_params_set_access psnd_pcm_hw_params_set_access #define snd_pcm_hw_params_set_format psnd_pcm_hw_params_set_format #define snd_pcm_hw_params_set_channels psnd_pcm_hw_params_set_channels #define snd_pcm_hw_params_set_periods_near psnd_pcm_hw_params_set_periods_near #define snd_pcm_hw_params_set_rate_near psnd_pcm_hw_params_set_rate_near #define snd_pcm_hw_params_set_rate psnd_pcm_hw_params_set_rate #define snd_pcm_hw_params_set_rate_resample psnd_pcm_hw_params_set_rate_resample #define snd_pcm_hw_params_set_buffer_time_near psnd_pcm_hw_params_set_buffer_time_near #define snd_pcm_hw_params_set_period_time_near psnd_pcm_hw_params_set_period_time_near #define snd_pcm_hw_params_set_buffer_size_near psnd_pcm_hw_params_set_buffer_size_near #define snd_pcm_hw_params_set_period_size_near psnd_pcm_hw_params_set_period_size_near #define snd_pcm_hw_params_set_buffer_size_min psnd_pcm_hw_params_set_buffer_size_min #define snd_pcm_hw_params_get_buffer_size psnd_pcm_hw_params_get_buffer_size #define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size #define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access #define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods #define snd_pcm_hw_params psnd_pcm_hw_params #define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc #define snd_pcm_sw_params_current psnd_pcm_sw_params_current #define snd_pcm_sw_params_set_avail_min psnd_pcm_sw_params_set_avail_min #define snd_pcm_sw_params psnd_pcm_sw_params #define snd_pcm_sw_params_free psnd_pcm_sw_params_free #define snd_pcm_prepare psnd_pcm_prepare #define snd_pcm_start psnd_pcm_start #define snd_pcm_resume psnd_pcm_resume #define snd_pcm_wait psnd_pcm_wait #define snd_pcm_state psnd_pcm_state #define snd_pcm_avail_update psnd_pcm_avail_update #define snd_pcm_areas_silence psnd_pcm_areas_silence #define snd_pcm_mmap_begin psnd_pcm_mmap_begin #define snd_pcm_mmap_commit psnd_pcm_mmap_commit #define snd_pcm_readi psnd_pcm_readi #define snd_pcm_writei psnd_pcm_writei #define snd_pcm_drain psnd_pcm_drain #define snd_pcm_recover psnd_pcm_recover #define snd_pcm_info_malloc psnd_pcm_info_malloc #define snd_pcm_info_free psnd_pcm_info_free #define snd_pcm_info_set_device psnd_pcm_info_set_device #define snd_pcm_info_set_subdevice psnd_pcm_info_set_subdevice #define snd_pcm_info_set_stream psnd_pcm_info_set_stream #define snd_pcm_info_get_name psnd_pcm_info_get_name #define snd_ctl_pcm_next_device psnd_ctl_pcm_next_device #define snd_ctl_pcm_info psnd_ctl_pcm_info #define snd_ctl_open psnd_ctl_open #define snd_ctl_close psnd_ctl_close #define snd_ctl_card_info_malloc psnd_ctl_card_info_malloc #define snd_ctl_card_info_free psnd_ctl_card_info_free #define snd_ctl_card_info psnd_ctl_card_info #define snd_ctl_card_info_get_name psnd_ctl_card_info_get_name #define snd_ctl_card_info_get_id psnd_ctl_card_info_get_id #define snd_card_next psnd_card_next #endif static ALCboolean alsa_load(void) { if(!alsa_handle) { #ifdef HAVE_DYNLOAD alsa_handle = LoadLib("libasound.so.2"); if(!alsa_handle) return ALC_FALSE; #define LOAD_FUNC(f) do { \ p##f = GetSymbol(alsa_handle, #f); \ if(p##f == NULL) { \ CloseLib(alsa_handle); \ alsa_handle = NULL; \ return ALC_FALSE; \ } \ } while(0) LOAD_FUNC(snd_strerror); LOAD_FUNC(snd_pcm_open); LOAD_FUNC(snd_pcm_close); LOAD_FUNC(snd_pcm_nonblock); LOAD_FUNC(snd_pcm_frames_to_bytes); LOAD_FUNC(snd_pcm_bytes_to_frames); LOAD_FUNC(snd_pcm_hw_params_malloc); LOAD_FUNC(snd_pcm_hw_params_free); LOAD_FUNC(snd_pcm_hw_params_any); LOAD_FUNC(snd_pcm_hw_params_set_access); LOAD_FUNC(snd_pcm_hw_params_set_format); LOAD_FUNC(snd_pcm_hw_params_set_channels); LOAD_FUNC(snd_pcm_hw_params_set_periods_near); LOAD_FUNC(snd_pcm_hw_params_set_rate_near); LOAD_FUNC(snd_pcm_hw_params_set_rate); LOAD_FUNC(snd_pcm_hw_params_set_rate_resample); LOAD_FUNC(snd_pcm_hw_params_set_buffer_time_near); LOAD_FUNC(snd_pcm_hw_params_set_period_time_near); LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_near); LOAD_FUNC(snd_pcm_hw_params_set_buffer_size_min); LOAD_FUNC(snd_pcm_hw_params_set_period_size_near); LOAD_FUNC(snd_pcm_hw_params_get_buffer_size); LOAD_FUNC(snd_pcm_hw_params_get_period_size); LOAD_FUNC(snd_pcm_hw_params_get_access); LOAD_FUNC(snd_pcm_hw_params_get_periods); LOAD_FUNC(snd_pcm_hw_params); LOAD_FUNC(snd_pcm_sw_params_malloc); LOAD_FUNC(snd_pcm_sw_params_current); LOAD_FUNC(snd_pcm_sw_params_set_avail_min); LOAD_FUNC(snd_pcm_sw_params); LOAD_FUNC(snd_pcm_sw_params_free); LOAD_FUNC(snd_pcm_prepare); LOAD_FUNC(snd_pcm_start); LOAD_FUNC(snd_pcm_resume); LOAD_FUNC(snd_pcm_wait); LOAD_FUNC(snd_pcm_state); LOAD_FUNC(snd_pcm_avail_update); LOAD_FUNC(snd_pcm_areas_silence); LOAD_FUNC(snd_pcm_mmap_begin); LOAD_FUNC(snd_pcm_mmap_commit); LOAD_FUNC(snd_pcm_readi); LOAD_FUNC(snd_pcm_writei); LOAD_FUNC(snd_pcm_drain); LOAD_FUNC(snd_pcm_recover); LOAD_FUNC(snd_pcm_info_malloc); LOAD_FUNC(snd_pcm_info_free); LOAD_FUNC(snd_pcm_info_set_device); LOAD_FUNC(snd_pcm_info_set_subdevice); LOAD_FUNC(snd_pcm_info_set_stream); LOAD_FUNC(snd_pcm_info_get_name); LOAD_FUNC(snd_ctl_pcm_next_device); LOAD_FUNC(snd_ctl_pcm_info); LOAD_FUNC(snd_ctl_open); LOAD_FUNC(snd_ctl_close); LOAD_FUNC(snd_ctl_card_info_malloc); LOAD_FUNC(snd_ctl_card_info_free); LOAD_FUNC(snd_ctl_card_info); LOAD_FUNC(snd_ctl_card_info_get_name); LOAD_FUNC(snd_ctl_card_info_get_id); LOAD_FUNC(snd_card_next); #undef LOAD_FUNC #else alsa_handle = (void*)0xDEADBEEF; #endif } return ALC_TRUE; } typedef struct { snd_pcm_t *pcmHandle; ALvoid *buffer; ALsizei size; ALboolean doCapture; RingBuffer *ring; volatile int killNow; ALvoid *thread; } alsa_data; typedef struct { ALCchar *name; char *card; int dev; } DevMap; static DevMap *allDevNameMap; static ALuint numDevNames; static DevMap *allCaptureDevNameMap; static ALuint numCaptureDevNames; static const char *device_prefix; static const char *capture_prefix; static DevMap *probe_devices(snd_pcm_stream_t stream, ALuint *count) { snd_ctl_t *handle; int card, err, dev, idx; snd_ctl_card_info_t *info; snd_pcm_info_t *pcminfo; DevMap *DevList; char name[1024]; snd_ctl_card_info_malloc(&info); snd_pcm_info_malloc(&pcminfo); card = -1; if((err=snd_card_next(&card)) < 0) ERR("Failed to find a card: %s\n", snd_strerror(err)); DevList = malloc(sizeof(DevMap) * 1); DevList[0].name = strdup("ALSA Default"); DevList[0].card = NULL; DevList[0].dev = 0; idx = 1; while(card >= 0) { sprintf(name, "hw:%d", card); if((err = snd_ctl_open(&handle, name, 0)) < 0) { ERR("control open (%i): %s\n", card, snd_strerror(err)); goto next_card; } if((err = snd_ctl_card_info(handle, info)) < 0) { ERR("control hardware info (%i): %s\n", card, snd_strerror(err)); snd_ctl_close(handle); goto next_card; } dev = -1; while(1) { const char *cname, *dname, *cid; void *temp; if(snd_ctl_pcm_next_device(handle, &dev) < 0) ERR("snd_ctl_pcm_next_device failed\n"); if(dev < 0) break; snd_pcm_info_set_device(pcminfo, dev); snd_pcm_info_set_subdevice(pcminfo, 0); snd_pcm_info_set_stream(pcminfo, stream); if((err = snd_ctl_pcm_info(handle, pcminfo)) < 0) { if(err != -ENOENT) ERR("control digital audio info (%i): %s\n", card, snd_strerror(err)); continue; } temp = realloc(DevList, sizeof(DevMap) * (idx+1)); if(temp) { DevList = temp; cname = snd_ctl_card_info_get_name(info); dname = snd_pcm_info_get_name(pcminfo); cid = snd_ctl_card_info_get_id(info); snprintf(name, sizeof(name), "%s, %s (CARD=%s,DEV=%d)", cname, dname, cid, dev); DevList[idx].name = strdup(name); DevList[idx].card = strdup(cid); DevList[idx].dev = dev; idx++; } } snd_ctl_close(handle); next_card: if(snd_card_next(&card) < 0) { ERR("snd_card_next failed\n"); break; } } snd_pcm_info_free(pcminfo); snd_ctl_card_info_free(info); *count = idx; return DevList; } static int xrun_recovery(snd_pcm_t *handle, int err) { err = snd_pcm_recover(handle, err, 1); if(err < 0) ERR("recover failed: %s\n", snd_strerror(err)); return err; } static int verify_state(snd_pcm_t *handle) { snd_pcm_state_t state = snd_pcm_state(handle); if(state == SND_PCM_STATE_DISCONNECTED) return -ENODEV; if(state == SND_PCM_STATE_XRUN) { int err = xrun_recovery(handle, -EPIPE); if(err < 0) return err; } else if(state == SND_PCM_STATE_SUSPENDED) { int err = xrun_recovery(handle, -ESTRPIPE); if(err < 0) return err; } return state; } static ALuint ALSAProc(ALvoid *ptr) { ALCdevice *pDevice = (ALCdevice*)ptr; alsa_data *data = (alsa_data*)pDevice->ExtraData; const snd_pcm_channel_area_t *areas = NULL; snd_pcm_sframes_t avail, commitres; snd_pcm_uframes_t offset, frames; char *WritePtr; int err; SetRTPriority(); while(!data->killNow) { int state = verify_state(data->pcmHandle); if(state < 0) { ERR("Invalid state detected: %s\n", snd_strerror(state)); aluHandleDisconnect(pDevice); break; } avail = snd_pcm_avail_update(data->pcmHandle); if(avail < 0) { ERR("available update failed: %s\n", snd_strerror(avail)); continue; } // make sure there's frames to process if((snd_pcm_uframes_t)avail < pDevice->UpdateSize) { if(state != SND_PCM_STATE_RUNNING) { err = snd_pcm_start(data->pcmHandle); if(err < 0) { ERR("start failed: %s\n", snd_strerror(err)); continue; } } if(snd_pcm_wait(data->pcmHandle, 1000) == 0) ERR("Wait timeout... buffer size too low?\n"); continue; } avail -= avail%pDevice->UpdateSize; // it is possible that contiguous areas are smaller, thus we use a loop while(avail > 0) { frames = avail; err = snd_pcm_mmap_begin(data->pcmHandle, &areas, &offset, &frames); if(err < 0) { ERR("mmap begin error: %s\n", snd_strerror(err)); break; } WritePtr = (char*)areas->addr + (offset * areas->step / 8); aluMixData(pDevice, WritePtr, frames); commitres = snd_pcm_mmap_commit(data->pcmHandle, offset, frames); if(commitres < 0 || (commitres-frames) != 0) { ERR("mmap commit error: %s\n", snd_strerror(commitres >= 0 ? -EPIPE : commitres)); break; } avail -= frames; } } return 0; } static ALuint ALSANoMMapProc(ALvoid *ptr) { ALCdevice *pDevice = (ALCdevice*)ptr; alsa_data *data = (alsa_data*)pDevice->ExtraData; snd_pcm_sframes_t avail; char *WritePtr; SetRTPriority(); while(!data->killNow) { int state = verify_state(data->pcmHandle); if(state < 0) { ERR("Invalid state detected: %s\n", snd_strerror(state)); aluHandleDisconnect(pDevice); break; } WritePtr = data->buffer; avail = data->size / snd_pcm_frames_to_bytes(data->pcmHandle, 1); aluMixData(pDevice, WritePtr, avail); while(avail > 0) { int ret = snd_pcm_writei(data->pcmHandle, WritePtr, avail); switch (ret) { case -EAGAIN: continue; case -ESTRPIPE: case -EPIPE: case -EINTR: ret = snd_pcm_recover(data->pcmHandle, ret, 1); if(ret < 0) avail = 0; break; default: if (ret >= 0) { WritePtr += snd_pcm_frames_to_bytes(data->pcmHandle, ret); avail -= ret; } break; } if (ret < 0) { ret = snd_pcm_prepare(data->pcmHandle); if(ret < 0) break; } } } return 0; } static ALCenum alsa_open_playback(ALCdevice *device, const ALCchar *deviceName) { alsa_data *data; char driver[128]; int i; strncpy(driver, GetConfigValue("alsa", "device", "default"), sizeof(driver)-1); driver[sizeof(driver)-1] = 0; if(!deviceName) deviceName = alsaDevice; else if(strcmp(deviceName, alsaDevice) != 0) { size_t idx; if(!allDevNameMap) allDevNameMap = probe_devices(SND_PCM_STREAM_PLAYBACK, &numDevNames); for(idx = 0;idx < numDevNames;idx++) { if(allDevNameMap[idx].name && strcmp(deviceName, allDevNameMap[idx].name) == 0) { if(idx > 0) snprintf(driver, sizeof(driver), "%sCARD=%s,DEV=%d", device_prefix, allDevNameMap[idx].card, allDevNameMap[idx].dev); break; } } if(idx == numDevNames) return ALC_INVALID_VALUE; } data = (alsa_data*)calloc(1, sizeof(alsa_data)); i = snd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); if(i >= 0) { i = snd_pcm_nonblock(data->pcmHandle, 0); if(i < 0) snd_pcm_close(data->pcmHandle); } if(i < 0) { free(data); ERR("Could not open playback device '%s': %s\n", driver, snd_strerror(i)); return ALC_OUT_OF_MEMORY; } device->szDeviceName = strdup(deviceName); device->ExtraData = data; return ALC_NO_ERROR; } static void alsa_close_playback(ALCdevice *device) { alsa_data *data = (alsa_data*)device->ExtraData; snd_pcm_close(data->pcmHandle); free(data); device->ExtraData = NULL; } static ALCboolean alsa_reset_playback(ALCdevice *device) { alsa_data *data = (alsa_data*)device->ExtraData; snd_pcm_uframes_t periodSizeInFrames; unsigned int periodLen, bufferLen; snd_pcm_sw_params_t *sp = NULL; snd_pcm_hw_params_t *p = NULL; snd_pcm_access_t access; snd_pcm_format_t format; unsigned int periods; unsigned int rate; int allowmmap; char *err; int i; format = -1; switch(device->FmtType) { case DevFmtByte: format = SND_PCM_FORMAT_S8; break; case DevFmtUByte: format = SND_PCM_FORMAT_U8; break; case DevFmtShort: format = SND_PCM_FORMAT_S16; break; case DevFmtUShort: format = SND_PCM_FORMAT_U16; break; case DevFmtFloat: format = SND_PCM_FORMAT_FLOAT; break; } allowmmap = GetConfigValueBool("alsa", "mmap", 1); periods = device->NumUpdates; periodLen = (ALuint64)device->UpdateSize * 1000000 / device->Frequency; bufferLen = periodLen * periods; rate = device->Frequency; err = NULL; snd_pcm_hw_params_malloc(&p); if((i=snd_pcm_hw_params_any(data->pcmHandle, p)) < 0) err = "any"; /* set interleaved access */ if(i >= 0 && (!allowmmap || (i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_MMAP_INTERLEAVED)) < 0)) { if(periods > 2) { periods--; bufferLen = periodLen * periods; } if((i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) err = "set access"; } /* set format (implicitly sets sample bits) */ if(i >= 0 && (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, format)) < 0) { device->FmtType = DevFmtFloat; if(format == SND_PCM_FORMAT_FLOAT || (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_FLOAT)) < 0) { device->FmtType = DevFmtShort; if(format == SND_PCM_FORMAT_S16 || (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_S16)) < 0) { device->FmtType = DevFmtUByte; if(format == SND_PCM_FORMAT_U8 || (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_U8)) < 0) err = "set format"; } } } /* set channels (implicitly sets frame bits) */ if(i >= 0 && (i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, ChannelsFromDevFmt(device->FmtChans))) < 0) { if((i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, 2)) < 0) { if((i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, 1)) < 0) err = "set channels"; else { if((device->Flags&DEVICE_CHANNELS_REQUEST)) ERR("Failed to set %s, got Mono instead\n", DevFmtChannelsString(device->FmtChans)); device->FmtChans = DevFmtMono; } } else { if((device->Flags&DEVICE_CHANNELS_REQUEST)) ERR("Failed to set %s, got Stereo instead\n", DevFmtChannelsString(device->FmtChans)); device->FmtChans = DevFmtStereo; } device->Flags &= ~DEVICE_CHANNELS_REQUEST; } if(i >= 0 && (i=snd_pcm_hw_params_set_rate_resample(data->pcmHandle, p, 0)) < 0) { ERR("Failed to disable ALSA resampler\n"); i = 0; } /* set rate (implicitly constrains period/buffer parameters) */ if(i >= 0 && (i=snd_pcm_hw_params_set_rate_near(data->pcmHandle, p, &rate, NULL)) < 0) err = "set rate near"; /* set buffer time (implicitly constrains period/buffer parameters) */ if(i >= 0 && (i=snd_pcm_hw_params_set_buffer_time_near(data->pcmHandle, p, &bufferLen, NULL)) < 0) err = "set buffer time near"; /* set period time in frame units (implicitly sets buffer size/bytes/time and period size/bytes) */ if(i >= 0 && (i=snd_pcm_hw_params_set_period_time_near(data->pcmHandle, p, &periodLen, NULL)) < 0) err = "set period time near"; /* install and prepare hardware configuration */ if(i >= 0 && (i=snd_pcm_hw_params(data->pcmHandle, p)) < 0) err = "set params"; if(i >= 0 && (i=snd_pcm_hw_params_get_access(p, &access)) < 0) err = "get access"; if(i >= 0 && (i=snd_pcm_hw_params_get_period_size(p, &periodSizeInFrames, NULL)) < 0) err = "get period size"; if(i >= 0 && (i=snd_pcm_hw_params_get_periods(p, &periods, NULL)) < 0) err = "get periods"; if(i < 0) { ERR("%s failed: %s\n", err, snd_strerror(i)); snd_pcm_hw_params_free(p); return ALC_FALSE; } snd_pcm_hw_params_free(p); err = NULL; snd_pcm_sw_params_malloc(&sp); if((i=snd_pcm_sw_params_current(data->pcmHandle, sp)) != 0) err = "sw current"; if(i == 0 && (i=snd_pcm_sw_params_set_avail_min(data->pcmHandle, sp, periodSizeInFrames)) != 0) err = "sw set avail min"; if(i == 0 && (i=snd_pcm_sw_params(data->pcmHandle, sp)) != 0) err = "sw set params"; if(i != 0) { ERR("%s failed: %s\n", err, snd_strerror(i)); snd_pcm_sw_params_free(sp); return ALC_FALSE; } snd_pcm_sw_params_free(sp); if(device->Frequency != rate) { if((device->Flags&DEVICE_FREQUENCY_REQUEST)) ERR("Failed to set %dhz, got %dhz instead\n", device->Frequency, rate); device->Flags &= ~DEVICE_FREQUENCY_REQUEST; device->Frequency = rate; } SetDefaultChannelOrder(device); data->size = snd_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) { ERR("buffer malloc failed\n"); return ALC_FALSE; } device->UpdateSize = periodSizeInFrames; device->NumUpdates = periods; data->thread = StartThread(ALSANoMMapProc, device); } else { i = snd_pcm_prepare(data->pcmHandle); if(i < 0) { ERR("prepare error: %s\n", snd_strerror(i)); return ALC_FALSE; } device->UpdateSize = periodSizeInFrames; device->NumUpdates = periods; data->thread = StartThread(ALSAProc, device); } if(data->thread == NULL) { ERR("Could not create playback thread\n"); free(data->buffer); data->buffer = NULL; return ALC_FALSE; } return ALC_TRUE; } static void alsa_stop_playback(ALCdevice *device) { alsa_data *data = (alsa_data*)device->ExtraData; if(data->thread) { data->killNow = 1; StopThread(data->thread); data->thread = NULL; } data->killNow = 0; free(data->buffer); data->buffer = NULL; } static ALCenum alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName) { snd_pcm_hw_params_t *p; snd_pcm_uframes_t bufferSizeInFrames; snd_pcm_format_t format; ALuint frameSize; alsa_data *data; char driver[128]; char *err; int i; strncpy(driver, GetConfigValue("alsa", "capture", "default"), sizeof(driver)-1); driver[sizeof(driver)-1] = 0; if(!allCaptureDevNameMap) allCaptureDevNameMap = probe_devices(SND_PCM_STREAM_CAPTURE, &numCaptureDevNames); if(!deviceName) deviceName = allCaptureDevNameMap[0].name; else { size_t idx; for(idx = 0;idx < numCaptureDevNames;idx++) { if(allCaptureDevNameMap[idx].name && strcmp(deviceName, allCaptureDevNameMap[idx].name) == 0) { if(idx > 0) snprintf(driver, sizeof(driver), "%sCARD=%s,DEV=%d", capture_prefix, allCaptureDevNameMap[idx].card, allCaptureDevNameMap[idx].dev); break; } } if(idx == numCaptureDevNames) return ALC_INVALID_VALUE; } data = (alsa_data*)calloc(1, sizeof(alsa_data)); i = snd_pcm_open(&data->pcmHandle, driver, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK); if(i < 0) { ERR("Could not open capture device '%s': %s\n", driver, snd_strerror(i)); free(data); return ALC_INVALID_VALUE; } format = -1; switch(pDevice->FmtType) { case DevFmtByte: format = SND_PCM_FORMAT_S8; break; case DevFmtUByte: format = SND_PCM_FORMAT_U8; break; case DevFmtShort: format = SND_PCM_FORMAT_S16; break; case DevFmtUShort: format = SND_PCM_FORMAT_U16; break; case DevFmtFloat: format = SND_PCM_FORMAT_FLOAT; break; } err = NULL; bufferSizeInFrames = pDevice->UpdateSize * pDevice->NumUpdates; snd_pcm_hw_params_malloc(&p); if((i=snd_pcm_hw_params_any(data->pcmHandle, p)) < 0) err = "any"; /* set interleaved access */ if(i >= 0 && (i=snd_pcm_hw_params_set_access(data->pcmHandle, p, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) err = "set access"; /* set format (implicitly sets sample bits) */ if(i >= 0 && (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, format)) < 0) err = "set format"; /* set channels (implicitly sets frame bits) */ if(i >= 0 && (i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, ChannelsFromDevFmt(pDevice->FmtChans))) < 0) err = "set channels"; /* set rate (implicitly constrains period/buffer parameters) */ if(i >= 0 && (i=snd_pcm_hw_params_set_rate(data->pcmHandle, p, pDevice->Frequency, 0)) < 0) err = "set rate near"; /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */ if(i >= 0 && (i=snd_pcm_hw_params_set_buffer_size_near(data->pcmHandle, p, &bufferSizeInFrames)) < 0) err = "set buffer size near"; /* install and prepare hardware configuration */ if(i >= 0 && (i=snd_pcm_hw_params(data->pcmHandle, p)) < 0) err = "set params"; if(i < 0) { ERR("%s failed: %s\n", err, snd_strerror(i)); snd_pcm_hw_params_free(p); goto error; } if((i=snd_pcm_hw_params_get_period_size(p, &bufferSizeInFrames, NULL)) < 0) { ERR("get size failed: %s\n", snd_strerror(i)); snd_pcm_hw_params_free(p); goto error; } snd_pcm_hw_params_free(p); frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType); data->ring = CreateRingBuffer(frameSize, pDevice->UpdateSize*pDevice->NumUpdates); if(!data->ring) { ERR("ring buffer create failed\n"); goto error; } data->size = snd_pcm_frames_to_bytes(data->pcmHandle, bufferSizeInFrames); data->buffer = malloc(data->size); if(!data->buffer) { ERR("buffer malloc failed\n"); goto error; } pDevice->szDeviceName = strdup(deviceName); pDevice->ExtraData = data; return ALC_NO_ERROR; error: free(data->buffer); DestroyRingBuffer(data->ring); snd_pcm_close(data->pcmHandle); free(data); pDevice->ExtraData = NULL; return ALC_INVALID_VALUE; } static void alsa_close_capture(ALCdevice *pDevice) { alsa_data *data = (alsa_data*)pDevice->ExtraData; snd_pcm_close(data->pcmHandle); DestroyRingBuffer(data->ring); free(data->buffer); free(data); pDevice->ExtraData = NULL; } static void alsa_start_capture(ALCdevice *Device) { alsa_data *data = (alsa_data*)Device->ExtraData; int err; err = snd_pcm_start(data->pcmHandle); if(err < 0) { ERR("start failed: %s\n", snd_strerror(err)); aluHandleDisconnect(Device); } else data->doCapture = AL_TRUE; } static void alsa_stop_capture(ALCdevice *Device) { alsa_data *data = (alsa_data*)Device->ExtraData; snd_pcm_drain(data->pcmHandle); data->doCapture = AL_FALSE; } static ALCuint alsa_available_samples(ALCdevice *Device) { alsa_data *data = (alsa_data*)Device->ExtraData; snd_pcm_sframes_t avail; avail = (Device->Connected ? snd_pcm_avail_update(data->pcmHandle) : 0); if(avail < 0) { ERR("avail update failed: %s\n", snd_strerror(avail)); if((avail=snd_pcm_recover(data->pcmHandle, avail, 1)) >= 0) { if(data->doCapture) avail = snd_pcm_start(data->pcmHandle); if(avail >= 0) avail = snd_pcm_avail_update(data->pcmHandle); } if(avail < 0) { ERR("restore error: %s\n", snd_strerror(avail)); aluHandleDisconnect(Device); } } while(avail > 0) { snd_pcm_sframes_t amt; amt = snd_pcm_bytes_to_frames(data->pcmHandle, data->size); if(avail < amt) amt = avail; amt = snd_pcm_readi(data->pcmHandle, data->buffer, amt); if(amt < 0) { ERR("read error: %s\n", snd_strerror(amt)); if(amt == -EAGAIN) continue; if((amt=snd_pcm_recover(data->pcmHandle, amt, 1)) >= 0) { if(data->doCapture) amt = snd_pcm_start(data->pcmHandle); if(amt >= 0) amt = snd_pcm_avail_update(data->pcmHandle); } if(amt < 0) { ERR("restore error: %s\n", snd_strerror(amt)); aluHandleDisconnect(Device); break; } avail = amt; continue; } WriteRingBuffer(data->ring, data->buffer, amt); avail -= amt; } return RingBufferSize(data->ring); } static void alsa_capture_samples(ALCdevice *Device, ALCvoid *Buffer, ALCuint Samples) { alsa_data *data = (alsa_data*)Device->ExtraData; if(Samples <= alsa_available_samples(Device)) ReadRingBuffer(data->ring, Buffer, Samples); else alcSetError(Device, ALC_INVALID_VALUE); } static const BackendFuncs alsa_funcs = { alsa_open_playback, alsa_close_playback, alsa_reset_playback, alsa_stop_playback, alsa_open_capture, alsa_close_capture, alsa_start_capture, alsa_stop_capture, alsa_capture_samples, alsa_available_samples }; ALCboolean alc_alsa_init(BackendFuncs *func_list) { if(!alsa_load()) return ALC_FALSE; device_prefix = GetConfigValue("alsa", "device-prefix", "plughw:"); capture_prefix = GetConfigValue("alsa", "capture-prefix", "plughw:"); *func_list = alsa_funcs; return ALC_TRUE; } void alc_alsa_deinit(void) { ALuint i; for(i = 0;i < numDevNames;++i) { free(allDevNameMap[i].name); free(allDevNameMap[i].card); } free(allDevNameMap); allDevNameMap = NULL; numDevNames = 0; for(i = 0;i < numCaptureDevNames;++i) { free(allCaptureDevNameMap[i].name); free(allCaptureDevNameMap[i].card); } free(allCaptureDevNameMap); allCaptureDevNameMap = NULL; numCaptureDevNames = 0; #ifdef HAVE_DYNLOAD if(alsa_handle) CloseLib(alsa_handle); alsa_handle = NULL; #endif } void alc_alsa_probe(enum DevProbe type) { ALuint i; switch(type) { case DEVICE_PROBE: AppendDeviceList(alsaDevice); break; case ALL_DEVICE_PROBE: for(i = 0;i < numDevNames;++i) { free(allDevNameMap[i].name); free(allDevNameMap[i].card); } free(allDevNameMap); allDevNameMap = probe_devices(SND_PCM_STREAM_PLAYBACK, &numDevNames); for(i = 0;i < numDevNames;++i) AppendAllDeviceList(allDevNameMap[i].name); break; case CAPTURE_DEVICE_PROBE: for(i = 0;i < numCaptureDevNames;++i) { free(allCaptureDevNameMap[i].name); free(allCaptureDevNameMap[i].card); } free(allCaptureDevNameMap); allCaptureDevNameMap = probe_devices(SND_PCM_STREAM_CAPTURE, &numCaptureDevNames); for(i = 0;i < numCaptureDevNames;++i) AppendCaptureDeviceList(allCaptureDevNameMap[i].name); break; } }