diff options
Diffstat (limited to 'Alc/backends/alsa.cpp')
| -rw-r--r-- | Alc/backends/alsa.cpp | 1470 |
1 files changed, 1470 insertions, 0 deletions
diff --git a/Alc/backends/alsa.cpp b/Alc/backends/alsa.cpp new file mode 100644 index 00000000..f9323bdb --- /dev/null +++ b/Alc/backends/alsa.cpp @@ -0,0 +1,1470 @@ +/** + * 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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * Or go to http://www.gnu.org/copyleft/lgpl.html + */ + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <memory.h> + +#include "alMain.h" +#include "alu.h" +#include "alconfig.h" +#include "ringbuffer.h" +#include "threads.h" +#include "compat.h" + +#include "backends/base.h" + +#include <alsa/asoundlib.h> + + +static const ALCchar alsaDevice[] = "ALSA Default"; + + +#ifdef HAVE_DYNLOAD +#define ALSA_FUNCS(MAGIC) \ + MAGIC(snd_strerror); \ + MAGIC(snd_pcm_open); \ + MAGIC(snd_pcm_close); \ + MAGIC(snd_pcm_nonblock); \ + MAGIC(snd_pcm_frames_to_bytes); \ + MAGIC(snd_pcm_bytes_to_frames); \ + MAGIC(snd_pcm_hw_params_malloc); \ + MAGIC(snd_pcm_hw_params_free); \ + MAGIC(snd_pcm_hw_params_any); \ + MAGIC(snd_pcm_hw_params_current); \ + MAGIC(snd_pcm_hw_params_set_access); \ + MAGIC(snd_pcm_hw_params_set_format); \ + MAGIC(snd_pcm_hw_params_set_channels); \ + MAGIC(snd_pcm_hw_params_set_periods_near); \ + MAGIC(snd_pcm_hw_params_set_rate_near); \ + MAGIC(snd_pcm_hw_params_set_rate); \ + MAGIC(snd_pcm_hw_params_set_rate_resample); \ + MAGIC(snd_pcm_hw_params_set_buffer_time_near); \ + MAGIC(snd_pcm_hw_params_set_period_time_near); \ + MAGIC(snd_pcm_hw_params_set_buffer_size_near); \ + MAGIC(snd_pcm_hw_params_set_period_size_near); \ + MAGIC(snd_pcm_hw_params_set_buffer_size_min); \ + MAGIC(snd_pcm_hw_params_get_buffer_time_min); \ + MAGIC(snd_pcm_hw_params_get_buffer_time_max); \ + MAGIC(snd_pcm_hw_params_get_period_time_min); \ + MAGIC(snd_pcm_hw_params_get_period_time_max); \ + MAGIC(snd_pcm_hw_params_get_buffer_size); \ + MAGIC(snd_pcm_hw_params_get_period_size); \ + MAGIC(snd_pcm_hw_params_get_access); \ + MAGIC(snd_pcm_hw_params_get_periods); \ + MAGIC(snd_pcm_hw_params_test_format); \ + MAGIC(snd_pcm_hw_params_test_channels); \ + MAGIC(snd_pcm_hw_params); \ + MAGIC(snd_pcm_sw_params_malloc); \ + MAGIC(snd_pcm_sw_params_current); \ + MAGIC(snd_pcm_sw_params_set_avail_min); \ + MAGIC(snd_pcm_sw_params_set_stop_threshold); \ + MAGIC(snd_pcm_sw_params); \ + MAGIC(snd_pcm_sw_params_free); \ + MAGIC(snd_pcm_prepare); \ + MAGIC(snd_pcm_start); \ + MAGIC(snd_pcm_resume); \ + MAGIC(snd_pcm_reset); \ + MAGIC(snd_pcm_wait); \ + MAGIC(snd_pcm_delay); \ + MAGIC(snd_pcm_state); \ + MAGIC(snd_pcm_avail_update); \ + MAGIC(snd_pcm_areas_silence); \ + MAGIC(snd_pcm_mmap_begin); \ + MAGIC(snd_pcm_mmap_commit); \ + MAGIC(snd_pcm_readi); \ + MAGIC(snd_pcm_writei); \ + MAGIC(snd_pcm_drain); \ + MAGIC(snd_pcm_drop); \ + MAGIC(snd_pcm_recover); \ + MAGIC(snd_pcm_info_malloc); \ + MAGIC(snd_pcm_info_free); \ + MAGIC(snd_pcm_info_set_device); \ + MAGIC(snd_pcm_info_set_subdevice); \ + MAGIC(snd_pcm_info_set_stream); \ + MAGIC(snd_pcm_info_get_name); \ + MAGIC(snd_ctl_pcm_next_device); \ + MAGIC(snd_ctl_pcm_info); \ + MAGIC(snd_ctl_open); \ + MAGIC(snd_ctl_close); \ + MAGIC(snd_ctl_card_info_malloc); \ + MAGIC(snd_ctl_card_info_free); \ + MAGIC(snd_ctl_card_info); \ + MAGIC(snd_ctl_card_info_get_name); \ + MAGIC(snd_ctl_card_info_get_id); \ + MAGIC(snd_card_next); \ + MAGIC(snd_config_update_free_global) + +static void *alsa_handle; +#define MAKE_FUNC(f) static decltype(f) * p##f +ALSA_FUNCS(MAKE_FUNC); +#undef MAKE_FUNC + +#ifndef IN_IDE_PARSER +#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_current psnd_pcm_hw_params_current +#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_time_min psnd_pcm_hw_params_get_buffer_time_min +#define snd_pcm_hw_params_get_buffer_time_max psnd_pcm_hw_params_get_buffer_time_max +#define snd_pcm_hw_params_get_period_time_min psnd_pcm_hw_params_get_period_time_min +#define snd_pcm_hw_params_get_period_time_max psnd_pcm_hw_params_get_period_time_max +#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_test_format psnd_pcm_hw_params_test_format +#define snd_pcm_hw_params_test_channels psnd_pcm_hw_params_test_channels +#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_set_stop_threshold psnd_pcm_sw_params_set_stop_threshold +#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_reset psnd_pcm_reset +#define snd_pcm_wait psnd_pcm_wait +#define snd_pcm_delay psnd_pcm_delay +#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_drop psnd_pcm_drop +#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 +#define snd_config_update_free_global psnd_config_update_free_global +#endif +#endif + + +static ALCboolean alsa_load(void) +{ + ALCboolean error = ALC_FALSE; + +#ifdef HAVE_DYNLOAD + if(!alsa_handle) + { + al_string missing_funcs = AL_STRING_INIT_STATIC(); + + alsa_handle = LoadLib("libasound.so.2"); + if(!alsa_handle) + { + WARN("Failed to load %s\n", "libasound.so.2"); + return ALC_FALSE; + } + + error = ALC_FALSE; +#define LOAD_FUNC(f) do { \ + p##f = reinterpret_cast<decltype(p##f)>(GetSymbol(alsa_handle, #f)); \ + if(p##f == NULL) { \ + error = ALC_TRUE; \ + alstr_append_cstr(&missing_funcs, "\n" #f); \ + } \ +} while(0) + ALSA_FUNCS(LOAD_FUNC); +#undef LOAD_FUNC + + if(error) + { + WARN("Missing expected functions:%s\n", alstr_get_cstr(missing_funcs)); + CloseLib(alsa_handle); + alsa_handle = NULL; + } + alstr_reset(&missing_funcs); + } +#endif + + return !error; +} + + +typedef struct { + al_string name; + al_string device_name; +} DevMap; +TYPEDEF_VECTOR(DevMap, vector_DevMap) + +static vector_DevMap PlaybackDevices; +static vector_DevMap CaptureDevices; + +static void clear_devlist(vector_DevMap *devlist) +{ +#define FREE_DEV(i) do { \ + AL_STRING_DEINIT((i)->name); \ + AL_STRING_DEINIT((i)->device_name); \ +} while(0) + VECTOR_FOR_EACH(DevMap, *devlist, FREE_DEV); + VECTOR_RESIZE(*devlist, 0, 0); +#undef FREE_DEV +} + + +static const char *prefix_name(snd_pcm_stream_t stream) +{ + assert(stream == SND_PCM_STREAM_PLAYBACK || stream == SND_PCM_STREAM_CAPTURE); + return (stream==SND_PCM_STREAM_PLAYBACK) ? "device-prefix" : "capture-prefix"; +} + +static void probe_devices(snd_pcm_stream_t stream, vector_DevMap *DeviceList) +{ + const char *main_prefix = "plughw:"; + snd_ctl_t *handle; + snd_ctl_card_info_t *info; + snd_pcm_info_t *pcminfo; + int card, err, dev; + DevMap entry; + + clear_devlist(DeviceList); + + snd_ctl_card_info_malloc(&info); + snd_pcm_info_malloc(&pcminfo); + + AL_STRING_INIT(entry.name); + AL_STRING_INIT(entry.device_name); + alstr_copy_cstr(&entry.name, alsaDevice); + alstr_copy_cstr(&entry.device_name, GetConfigValue( + NULL, "alsa", (stream==SND_PCM_STREAM_PLAYBACK) ? "device" : "capture", "default" + )); + VECTOR_PUSH_BACK(*DeviceList, entry); + + if(stream == SND_PCM_STREAM_PLAYBACK) + { + const char *customdevs, *sep, *next; + next = GetConfigValue(NULL, "alsa", "custom-devices", ""); + while((customdevs=next) != NULL && customdevs[0]) + { + next = strchr(customdevs, ';'); + sep = strchr(customdevs, '='); + if(!sep) + { + al_string spec = AL_STRING_INIT_STATIC(); + if(next) + alstr_copy_range(&spec, customdevs, next++); + else + alstr_copy_cstr(&spec, customdevs); + ERR("Invalid ALSA device specification \"%s\"\n", alstr_get_cstr(spec)); + alstr_reset(&spec); + continue; + } + + AL_STRING_INIT(entry.name); + AL_STRING_INIT(entry.device_name); + alstr_copy_range(&entry.name, customdevs, sep++); + if(next) + alstr_copy_range(&entry.device_name, sep, next++); + else + alstr_copy_cstr(&entry.device_name, sep); + TRACE("Got device \"%s\", \"%s\"\n", alstr_get_cstr(entry.name), + alstr_get_cstr(entry.device_name)); + VECTOR_PUSH_BACK(*DeviceList, entry); + } + } + + card = -1; + if((err=snd_card_next(&card)) < 0) + ERR("Failed to find a card: %s\n", snd_strerror(err)); + ConfigValueStr(NULL, "alsa", prefix_name(stream), &main_prefix); + while(card >= 0) + { + const char *card_prefix = main_prefix; + const char *cardname, *cardid; + char name[256]; + + snprintf(name, sizeof(name), "hw:%d", card); + if((err = snd_ctl_open(&handle, name, 0)) < 0) + { + ERR("control open (hw:%d): %s\n", card, snd_strerror(err)); + goto next_card; + } + if((err = snd_ctl_card_info(handle, info)) < 0) + { + ERR("control hardware info (hw:%d): %s\n", card, snd_strerror(err)); + snd_ctl_close(handle); + goto next_card; + } + + cardname = snd_ctl_card_info_get_name(info); + cardid = snd_ctl_card_info_get_id(info); + + snprintf(name, sizeof(name), "%s-%s", prefix_name(stream), cardid); + ConfigValueStr(NULL, "alsa", name, &card_prefix); + + dev = -1; + while(1) + { + const char *device_prefix = card_prefix; + const char *devname; + char device[128]; + + 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 (hw:%d): %s\n", card, snd_strerror(err)); + continue; + } + + devname = snd_pcm_info_get_name(pcminfo); + + snprintf(name, sizeof(name), "%s-%s-%d", prefix_name(stream), cardid, dev); + ConfigValueStr(NULL, "alsa", name, &device_prefix); + + snprintf(name, sizeof(name), "%s, %s (CARD=%s,DEV=%d)", + cardname, devname, cardid, dev); + snprintf(device, sizeof(device), "%sCARD=%s,DEV=%d", + device_prefix, cardid, dev); + + TRACE("Got device \"%s\", \"%s\"\n", name, device); + AL_STRING_INIT(entry.name); + AL_STRING_INIT(entry.device_name); + alstr_copy_cstr(&entry.name, name); + alstr_copy_cstr(&entry.device_name, device); + VECTOR_PUSH_BACK(*DeviceList, entry); + } + 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); +} + + +static int verify_state(snd_pcm_t *handle) +{ + snd_pcm_state_t state = snd_pcm_state(handle); + int err; + + switch(state) + { + case SND_PCM_STATE_OPEN: + case SND_PCM_STATE_SETUP: + case SND_PCM_STATE_PREPARED: + case SND_PCM_STATE_RUNNING: + case SND_PCM_STATE_DRAINING: + case SND_PCM_STATE_PAUSED: + /* All Okay */ + break; + + case SND_PCM_STATE_XRUN: + if((err=snd_pcm_recover(handle, -EPIPE, 1)) < 0) + return err; + break; + case SND_PCM_STATE_SUSPENDED: + if((err=snd_pcm_recover(handle, -ESTRPIPE, 1)) < 0) + return err; + break; + case SND_PCM_STATE_DISCONNECTED: + return -ENODEV; + } + + return state; +} + + +struct ALCplaybackAlsa final : public ALCbackend { + snd_pcm_t *pcmHandle; + + ALvoid *buffer; + ALsizei size; + + ATOMIC(ALenum) killNow; + althrd_t thread; +}; + +static int ALCplaybackAlsa_mixerProc(void *ptr); +static int ALCplaybackAlsa_mixerNoMMapProc(void *ptr); + +static void ALCplaybackAlsa_Construct(ALCplaybackAlsa *self, ALCdevice *device); +static void ALCplaybackAlsa_Destruct(ALCplaybackAlsa *self); +static ALCenum ALCplaybackAlsa_open(ALCplaybackAlsa *self, const ALCchar *name); +static ALCboolean ALCplaybackAlsa_reset(ALCplaybackAlsa *self); +static ALCboolean ALCplaybackAlsa_start(ALCplaybackAlsa *self); +static void ALCplaybackAlsa_stop(ALCplaybackAlsa *self); +static DECLARE_FORWARD2(ALCplaybackAlsa, ALCbackend, ALCenum, captureSamples, void*, ALCuint) +static DECLARE_FORWARD(ALCplaybackAlsa, ALCbackend, ALCuint, availableSamples) +static ClockLatency ALCplaybackAlsa_getClockLatency(ALCplaybackAlsa *self); +static DECLARE_FORWARD(ALCplaybackAlsa, ALCbackend, void, lock) +static DECLARE_FORWARD(ALCplaybackAlsa, ALCbackend, void, unlock) +DECLARE_DEFAULT_ALLOCATORS(ALCplaybackAlsa) + +DEFINE_ALCBACKEND_VTABLE(ALCplaybackAlsa); + + +static void ALCplaybackAlsa_Construct(ALCplaybackAlsa *self, ALCdevice *device) +{ + new (self) ALCplaybackAlsa{}; + ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device); + SET_VTABLE2(ALCplaybackAlsa, ALCbackend, self); + + self->pcmHandle = NULL; + self->buffer = NULL; + + ATOMIC_INIT(&self->killNow, AL_TRUE); +} + +void ALCplaybackAlsa_Destruct(ALCplaybackAlsa *self) +{ + if(self->pcmHandle) + snd_pcm_close(self->pcmHandle); + self->pcmHandle = NULL; + ALCbackend_Destruct(STATIC_CAST(ALCbackend, self)); + self->~ALCplaybackAlsa(); +} + + +static int ALCplaybackAlsa_mixerProc(void *ptr) +{ + ALCplaybackAlsa *self = static_cast<ALCplaybackAlsa*>(ptr); + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + const snd_pcm_channel_area_t *areas = NULL; + snd_pcm_uframes_t update_size, num_updates; + snd_pcm_sframes_t avail, commitres; + snd_pcm_uframes_t offset, frames; + char *WritePtr; + int err; + + SetRTPriority(); + althrd_setname(althrd_current(), MIXER_THREAD_NAME); + + update_size = device->UpdateSize; + num_updates = device->NumUpdates; + while(!ATOMIC_LOAD(&self->killNow, almemory_order_acquire)) + { + int state = verify_state(self->pcmHandle); + if(state < 0) + { + ERR("Invalid state detected: %s\n", snd_strerror(state)); + ALCplaybackAlsa_lock(self); + aluHandleDisconnect(device, "Bad state: %s", snd_strerror(state)); + ALCplaybackAlsa_unlock(self); + break; + } + + avail = snd_pcm_avail_update(self->pcmHandle); + if(avail < 0) + { + ERR("available update failed: %s\n", snd_strerror(avail)); + continue; + } + + if((snd_pcm_uframes_t)avail > update_size*(num_updates+1)) + { + WARN("available samples exceeds the buffer size\n"); + snd_pcm_reset(self->pcmHandle); + continue; + } + + // make sure there's frames to process + if((snd_pcm_uframes_t)avail < update_size) + { + if(state != SND_PCM_STATE_RUNNING) + { + err = snd_pcm_start(self->pcmHandle); + if(err < 0) + { + ERR("start failed: %s\n", snd_strerror(err)); + continue; + } + } + if(snd_pcm_wait(self->pcmHandle, 1000) == 0) + ERR("Wait timeout... buffer size too low?\n"); + continue; + } + avail -= avail%update_size; + + // it is possible that contiguous areas are smaller, thus we use a loop + ALCplaybackAlsa_lock(self); + while(avail > 0) + { + frames = avail; + + err = snd_pcm_mmap_begin(self->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(device, WritePtr, frames); + + commitres = snd_pcm_mmap_commit(self->pcmHandle, offset, frames); + if(commitres < 0 || (commitres-frames) != 0) + { + ERR("mmap commit error: %s\n", + snd_strerror(commitres >= 0 ? -EPIPE : commitres)); + break; + } + + avail -= frames; + } + ALCplaybackAlsa_unlock(self); + } + + return 0; +} + +static int ALCplaybackAlsa_mixerNoMMapProc(void *ptr) +{ + ALCplaybackAlsa *self = static_cast<ALCplaybackAlsa*>(ptr); + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + snd_pcm_uframes_t update_size, num_updates; + snd_pcm_sframes_t avail; + char *WritePtr; + int err; + + SetRTPriority(); + althrd_setname(althrd_current(), MIXER_THREAD_NAME); + + update_size = device->UpdateSize; + num_updates = device->NumUpdates; + while(!ATOMIC_LOAD(&self->killNow, almemory_order_acquire)) + { + int state = verify_state(self->pcmHandle); + if(state < 0) + { + ERR("Invalid state detected: %s\n", snd_strerror(state)); + ALCplaybackAlsa_lock(self); + aluHandleDisconnect(device, "Bad state: %s", snd_strerror(state)); + ALCplaybackAlsa_unlock(self); + break; + } + + avail = snd_pcm_avail_update(self->pcmHandle); + if(avail < 0) + { + ERR("available update failed: %s\n", snd_strerror(avail)); + continue; + } + + if((snd_pcm_uframes_t)avail > update_size*num_updates) + { + WARN("available samples exceeds the buffer size\n"); + snd_pcm_reset(self->pcmHandle); + continue; + } + + if((snd_pcm_uframes_t)avail < update_size) + { + if(state != SND_PCM_STATE_RUNNING) + { + err = snd_pcm_start(self->pcmHandle); + if(err < 0) + { + ERR("start failed: %s\n", snd_strerror(err)); + continue; + } + } + if(snd_pcm_wait(self->pcmHandle, 1000) == 0) + ERR("Wait timeout... buffer size too low?\n"); + continue; + } + + ALCplaybackAlsa_lock(self); + WritePtr = static_cast<char*>(self->buffer); + avail = snd_pcm_bytes_to_frames(self->pcmHandle, self->size); + aluMixData(device, WritePtr, avail); + + while(avail > 0) + { + int ret = snd_pcm_writei(self->pcmHandle, WritePtr, avail); + switch (ret) + { + case -EAGAIN: + continue; +#if ESTRPIPE != EPIPE + case -ESTRPIPE: +#endif + case -EPIPE: + case -EINTR: + ret = snd_pcm_recover(self->pcmHandle, ret, 1); + if(ret < 0) + avail = 0; + break; + default: + if (ret >= 0) + { + WritePtr += snd_pcm_frames_to_bytes(self->pcmHandle, ret); + avail -= ret; + } + break; + } + if (ret < 0) + { + ret = snd_pcm_prepare(self->pcmHandle); + if(ret < 0) + break; + } + } + ALCplaybackAlsa_unlock(self); + } + + return 0; +} + + +static ALCenum ALCplaybackAlsa_open(ALCplaybackAlsa *self, const ALCchar *name) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + const char *driver = NULL; + int err; + + if(name) + { + const DevMap *iter; + + if(VECTOR_SIZE(PlaybackDevices) == 0) + probe_devices(SND_PCM_STREAM_PLAYBACK, &PlaybackDevices); + +#define MATCH_NAME(i) (alstr_cmp_cstr((i)->name, name) == 0) + VECTOR_FIND_IF(iter, const DevMap, PlaybackDevices, MATCH_NAME); +#undef MATCH_NAME + if(iter == VECTOR_END(PlaybackDevices)) + return ALC_INVALID_VALUE; + driver = alstr_get_cstr(iter->device_name); + } + else + { + name = alsaDevice; + driver = GetConfigValue(NULL, "alsa", "device", "default"); + } + + TRACE("Opening device \"%s\"\n", driver); + err = snd_pcm_open(&self->pcmHandle, driver, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); + if(err < 0) + { + ERR("Could not open playback device '%s': %s\n", driver, snd_strerror(err)); + return ALC_OUT_OF_MEMORY; + } + + /* Free alsa's global config tree. Otherwise valgrind reports a ton of leaks. */ + snd_config_update_free_global(); + + alstr_copy_cstr(&device->DeviceName, name); + + return ALC_NO_ERROR; +} + +static ALCboolean ALCplaybackAlsa_reset(ALCplaybackAlsa *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + snd_pcm_uframes_t periodSizeInFrames; + unsigned int periodLen, bufferLen; + snd_pcm_sw_params_t *sp = NULL; + snd_pcm_hw_params_t *hp = NULL; + snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN; + snd_pcm_access_t access; + unsigned int periods; + unsigned int rate; + const char *funcerr; + int allowmmap; + int dir; + int err; + + 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 DevFmtInt: + format = SND_PCM_FORMAT_S32; + break; + case DevFmtUInt: + format = SND_PCM_FORMAT_U32; + break; + case DevFmtFloat: + format = SND_PCM_FORMAT_FLOAT; + break; + } + + allowmmap = GetConfigValueBool(alstr_get_cstr(device->DeviceName), "alsa", "mmap", 1); + periods = device->NumUpdates; + periodLen = (ALuint64)device->UpdateSize * 1000000 / device->Frequency; + bufferLen = periodLen * periods; + rate = device->Frequency; + + snd_pcm_hw_params_malloc(&hp); +#define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error + CHECK(snd_pcm_hw_params_any(self->pcmHandle, hp)); + /* set interleaved access */ + if(!allowmmap || snd_pcm_hw_params_set_access(self->pcmHandle, hp, SND_PCM_ACCESS_MMAP_INTERLEAVED) < 0) + { + /* No mmap */ + CHECK(snd_pcm_hw_params_set_access(self->pcmHandle, hp, SND_PCM_ACCESS_RW_INTERLEAVED)); + } + /* test and set format (implicitly sets sample bits) */ + if(snd_pcm_hw_params_test_format(self->pcmHandle, hp, format) < 0) + { + static const struct { + snd_pcm_format_t format; + enum DevFmtType fmttype; + } formatlist[] = { + { SND_PCM_FORMAT_FLOAT, DevFmtFloat }, + { SND_PCM_FORMAT_S32, DevFmtInt }, + { SND_PCM_FORMAT_U32, DevFmtUInt }, + { SND_PCM_FORMAT_S16, DevFmtShort }, + { SND_PCM_FORMAT_U16, DevFmtUShort }, + { SND_PCM_FORMAT_S8, DevFmtByte }, + { SND_PCM_FORMAT_U8, DevFmtUByte }, + }; + size_t k; + + for(k = 0;k < COUNTOF(formatlist);k++) + { + format = formatlist[k].format; + if(snd_pcm_hw_params_test_format(self->pcmHandle, hp, format) >= 0) + { + device->FmtType = formatlist[k].fmttype; + break; + } + } + } + CHECK(snd_pcm_hw_params_set_format(self->pcmHandle, hp, format)); + /* test and set channels (implicitly sets frame bits) */ + if(snd_pcm_hw_params_test_channels(self->pcmHandle, hp, ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder)) < 0) + { + static const enum DevFmtChannels channellist[] = { + DevFmtStereo, + DevFmtQuad, + DevFmtX51, + DevFmtX71, + DevFmtMono, + }; + size_t k; + + for(k = 0;k < COUNTOF(channellist);k++) + { + if(snd_pcm_hw_params_test_channels(self->pcmHandle, hp, ChannelsFromDevFmt(channellist[k], 0)) >= 0) + { + device->FmtChans = channellist[k]; + device->AmbiOrder = 0; + break; + } + } + } + CHECK(snd_pcm_hw_params_set_channels(self->pcmHandle, hp, ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder))); + /* set rate (implicitly constrains period/buffer parameters) */ + if(!GetConfigValueBool(alstr_get_cstr(device->DeviceName), "alsa", "allow-resampler", 0) || + !(device->Flags&DEVICE_FREQUENCY_REQUEST)) + { + if(snd_pcm_hw_params_set_rate_resample(self->pcmHandle, hp, 0) < 0) + ERR("Failed to disable ALSA resampler\n"); + } + else if(snd_pcm_hw_params_set_rate_resample(self->pcmHandle, hp, 1) < 0) + ERR("Failed to enable ALSA resampler\n"); + CHECK(snd_pcm_hw_params_set_rate_near(self->pcmHandle, hp, &rate, NULL)); + /* set buffer time (implicitly constrains period/buffer parameters) */ + if((err=snd_pcm_hw_params_set_buffer_time_near(self->pcmHandle, hp, &bufferLen, NULL)) < 0) + ERR("snd_pcm_hw_params_set_buffer_time_near failed: %s\n", snd_strerror(err)); + /* set period time (implicitly sets buffer size/bytes/time and period size/bytes) */ + if((err=snd_pcm_hw_params_set_period_time_near(self->pcmHandle, hp, &periodLen, NULL)) < 0) + ERR("snd_pcm_hw_params_set_period_time_near failed: %s\n", snd_strerror(err)); + /* install and prepare hardware configuration */ + CHECK(snd_pcm_hw_params(self->pcmHandle, hp)); + /* retrieve configuration info */ + CHECK(snd_pcm_hw_params_get_access(hp, &access)); + CHECK(snd_pcm_hw_params_get_period_size(hp, &periodSizeInFrames, NULL)); + CHECK(snd_pcm_hw_params_get_periods(hp, &periods, &dir)); + if(dir != 0) + WARN("Inexact period count: %u (%d)\n", periods, dir); + + snd_pcm_hw_params_free(hp); + hp = NULL; + snd_pcm_sw_params_malloc(&sp); + + CHECK(snd_pcm_sw_params_current(self->pcmHandle, sp)); + CHECK(snd_pcm_sw_params_set_avail_min(self->pcmHandle, sp, periodSizeInFrames)); + CHECK(snd_pcm_sw_params_set_stop_threshold(self->pcmHandle, sp, periodSizeInFrames*periods)); + CHECK(snd_pcm_sw_params(self->pcmHandle, sp)); +#undef CHECK + snd_pcm_sw_params_free(sp); + sp = NULL; + + device->NumUpdates = periods; + device->UpdateSize = periodSizeInFrames; + device->Frequency = rate; + + SetDefaultChannelOrder(device); + + return ALC_TRUE; + +error: + ERR("%s failed: %s\n", funcerr, snd_strerror(err)); + if(hp) snd_pcm_hw_params_free(hp); + if(sp) snd_pcm_sw_params_free(sp); + return ALC_FALSE; +} + +static ALCboolean ALCplaybackAlsa_start(ALCplaybackAlsa *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + int (*thread_func)(void*) = NULL; + snd_pcm_hw_params_t *hp = NULL; + snd_pcm_access_t access; + const char *funcerr; + int err; + + snd_pcm_hw_params_malloc(&hp); +#define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error + CHECK(snd_pcm_hw_params_current(self->pcmHandle, hp)); + /* retrieve configuration info */ + CHECK(snd_pcm_hw_params_get_access(hp, &access)); +#undef CHECK + snd_pcm_hw_params_free(hp); + hp = NULL; + + self->size = snd_pcm_frames_to_bytes(self->pcmHandle, device->UpdateSize); + if(access == SND_PCM_ACCESS_RW_INTERLEAVED) + { + self->buffer = al_malloc(16, self->size); + if(!self->buffer) + { + ERR("buffer malloc failed\n"); + return ALC_FALSE; + } + thread_func = ALCplaybackAlsa_mixerNoMMapProc; + } + else + { + err = snd_pcm_prepare(self->pcmHandle); + if(err < 0) + { + ERR("snd_pcm_prepare(data->pcmHandle) failed: %s\n", snd_strerror(err)); + return ALC_FALSE; + } + thread_func = ALCplaybackAlsa_mixerProc; + } + ATOMIC_STORE(&self->killNow, AL_FALSE, almemory_order_release); + if(althrd_create(&self->thread, thread_func, self) != althrd_success) + { + ERR("Could not create playback thread\n"); + al_free(self->buffer); + self->buffer = NULL; + return ALC_FALSE; + } + + return ALC_TRUE; + +error: + ERR("%s failed: %s\n", funcerr, snd_strerror(err)); + if(hp) snd_pcm_hw_params_free(hp); + return ALC_FALSE; +} + +static void ALCplaybackAlsa_stop(ALCplaybackAlsa *self) +{ + int res; + + if(ATOMIC_EXCHANGE(&self->killNow, AL_TRUE, almemory_order_acq_rel)) + return; + althrd_join(self->thread, &res); + + al_free(self->buffer); + self->buffer = NULL; +} + +static ClockLatency ALCplaybackAlsa_getClockLatency(ALCplaybackAlsa *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + snd_pcm_sframes_t delay = 0; + ClockLatency ret; + int err; + + ALCplaybackAlsa_lock(self); + ret.ClockTime = GetDeviceClockTime(device); + if((err=snd_pcm_delay(self->pcmHandle, &delay)) < 0) + { + ERR("Failed to get pcm delay: %s\n", snd_strerror(err)); + delay = 0; + } + if(delay < 0) delay = 0; + ret.Latency = delay * DEVICE_CLOCK_RES / device->Frequency; + ALCplaybackAlsa_unlock(self); + + return ret; +} + + +struct ALCcaptureAlsa final : public ALCbackend { + snd_pcm_t *pcmHandle; + + ALvoid *buffer; + ALsizei size; + + ALboolean doCapture; + ll_ringbuffer_t *ring; + + snd_pcm_sframes_t last_avail; +}; + +static void ALCcaptureAlsa_Construct(ALCcaptureAlsa *self, ALCdevice *device); +static void ALCcaptureAlsa_Destruct(ALCcaptureAlsa *self); +static ALCenum ALCcaptureAlsa_open(ALCcaptureAlsa *self, const ALCchar *name); +static DECLARE_FORWARD(ALCcaptureAlsa, ALCbackend, ALCboolean, reset) +static ALCboolean ALCcaptureAlsa_start(ALCcaptureAlsa *self); +static void ALCcaptureAlsa_stop(ALCcaptureAlsa *self); +static ALCenum ALCcaptureAlsa_captureSamples(ALCcaptureAlsa *self, ALCvoid *buffer, ALCuint samples); +static ALCuint ALCcaptureAlsa_availableSamples(ALCcaptureAlsa *self); +static ClockLatency ALCcaptureAlsa_getClockLatency(ALCcaptureAlsa *self); +static DECLARE_FORWARD(ALCcaptureAlsa, ALCbackend, void, lock) +static DECLARE_FORWARD(ALCcaptureAlsa, ALCbackend, void, unlock) +DECLARE_DEFAULT_ALLOCATORS(ALCcaptureAlsa) + +DEFINE_ALCBACKEND_VTABLE(ALCcaptureAlsa); + + +static void ALCcaptureAlsa_Construct(ALCcaptureAlsa *self, ALCdevice *device) +{ + new (self) ALCcaptureAlsa{}; + ALCbackend_Construct(STATIC_CAST(ALCbackend, self), device); + SET_VTABLE2(ALCcaptureAlsa, ALCbackend, self); + + self->pcmHandle = NULL; + self->buffer = NULL; + self->ring = NULL; +} + +void ALCcaptureAlsa_Destruct(ALCcaptureAlsa *self) +{ + if(self->pcmHandle) + snd_pcm_close(self->pcmHandle); + self->pcmHandle = NULL; + + al_free(self->buffer); + self->buffer = NULL; + + ll_ringbuffer_free(self->ring); + self->ring = NULL; + + ALCbackend_Destruct(STATIC_CAST(ALCbackend, self)); + self->~ALCcaptureAlsa(); +} + + +static ALCenum ALCcaptureAlsa_open(ALCcaptureAlsa *self, const ALCchar *name) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + const char *driver = NULL; + snd_pcm_hw_params_t *hp; + snd_pcm_uframes_t bufferSizeInFrames; + snd_pcm_uframes_t periodSizeInFrames; + ALboolean needring = AL_FALSE; + snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN; + const char *funcerr; + int err; + + if(name) + { + const DevMap *iter; + + if(VECTOR_SIZE(CaptureDevices) == 0) + probe_devices(SND_PCM_STREAM_CAPTURE, &CaptureDevices); + +#define MATCH_NAME(i) (alstr_cmp_cstr((i)->name, name) == 0) + VECTOR_FIND_IF(iter, const DevMap, CaptureDevices, MATCH_NAME); +#undef MATCH_NAME + if(iter == VECTOR_END(CaptureDevices)) + return ALC_INVALID_VALUE; + driver = alstr_get_cstr(iter->device_name); + } + else + { + name = alsaDevice; + driver = GetConfigValue(NULL, "alsa", "capture", "default"); + } + + TRACE("Opening device \"%s\"\n", driver); + err = snd_pcm_open(&self->pcmHandle, driver, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK); + if(err < 0) + { + ERR("Could not open capture device '%s': %s\n", driver, snd_strerror(err)); + return ALC_INVALID_VALUE; + } + + /* Free alsa's global config tree. Otherwise valgrind reports a ton of leaks. */ + snd_config_update_free_global(); + + 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 DevFmtInt: + format = SND_PCM_FORMAT_S32; + break; + case DevFmtUInt: + format = SND_PCM_FORMAT_U32; + break; + case DevFmtFloat: + format = SND_PCM_FORMAT_FLOAT; + break; + } + + funcerr = NULL; + bufferSizeInFrames = maxu(device->UpdateSize*device->NumUpdates, + 100*device->Frequency/1000); + periodSizeInFrames = minu(bufferSizeInFrames, 25*device->Frequency/1000); + + snd_pcm_hw_params_malloc(&hp); +#define CHECK(x) if((funcerr=#x),(err=(x)) < 0) goto error + CHECK(snd_pcm_hw_params_any(self->pcmHandle, hp)); + /* set interleaved access */ + CHECK(snd_pcm_hw_params_set_access(self->pcmHandle, hp, SND_PCM_ACCESS_RW_INTERLEAVED)); + /* set format (implicitly sets sample bits) */ + CHECK(snd_pcm_hw_params_set_format(self->pcmHandle, hp, format)); + /* set channels (implicitly sets frame bits) */ + CHECK(snd_pcm_hw_params_set_channels(self->pcmHandle, hp, ChannelsFromDevFmt(device->FmtChans, device->AmbiOrder))); + /* set rate (implicitly constrains period/buffer parameters) */ + CHECK(snd_pcm_hw_params_set_rate(self->pcmHandle, hp, device->Frequency, 0)); + /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */ + if(snd_pcm_hw_params_set_buffer_size_min(self->pcmHandle, hp, &bufferSizeInFrames) < 0) + { + TRACE("Buffer too large, using intermediate ring buffer\n"); + needring = AL_TRUE; + CHECK(snd_pcm_hw_params_set_buffer_size_near(self->pcmHandle, hp, &bufferSizeInFrames)); + } + /* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */ + CHECK(snd_pcm_hw_params_set_period_size_near(self->pcmHandle, hp, &periodSizeInFrames, NULL)); + /* install and prepare hardware configuration */ + CHECK(snd_pcm_hw_params(self->pcmHandle, hp)); + /* retrieve configuration info */ + CHECK(snd_pcm_hw_params_get_period_size(hp, &periodSizeInFrames, NULL)); +#undef CHECK + snd_pcm_hw_params_free(hp); + hp = NULL; + + if(needring) + { + self->ring = ll_ringbuffer_create( + device->UpdateSize*device->NumUpdates, + FrameSizeFromDevFmt(device->FmtChans, device->FmtType, device->AmbiOrder), + false + ); + if(!self->ring) + { + ERR("ring buffer create failed\n"); + goto error2; + } + } + + alstr_copy_cstr(&device->DeviceName, name); + + return ALC_NO_ERROR; + +error: + ERR("%s failed: %s\n", funcerr, snd_strerror(err)); + if(hp) snd_pcm_hw_params_free(hp); + +error2: + ll_ringbuffer_free(self->ring); + self->ring = NULL; + snd_pcm_close(self->pcmHandle); + self->pcmHandle = NULL; + + return ALC_INVALID_VALUE; +} + +static ALCboolean ALCcaptureAlsa_start(ALCcaptureAlsa *self) +{ + int err = snd_pcm_prepare(self->pcmHandle); + if(err < 0) + ERR("prepare failed: %s\n", snd_strerror(err)); + else + { + err = snd_pcm_start(self->pcmHandle); + if(err < 0) + ERR("start failed: %s\n", snd_strerror(err)); + } + if(err < 0) + { + aluHandleDisconnect(STATIC_CAST(ALCbackend, self)->mDevice, "Capture state failure: %s", + snd_strerror(err)); + return ALC_FALSE; + } + + self->doCapture = AL_TRUE; + return ALC_TRUE; +} + +static void ALCcaptureAlsa_stop(ALCcaptureAlsa *self) +{ + ALCuint avail; + int err; + + /* OpenAL requires access to unread audio after stopping, but ALSA's + * snd_pcm_drain is unreliable and snd_pcm_drop drops it. Capture what's + * available now so it'll be available later after the drop. */ + avail = ALCcaptureAlsa_availableSamples(self); + if(!self->ring && avail > 0) + { + /* The ring buffer implicitly captures when checking availability. + * Direct access needs to explicitly capture it into temp storage. */ + ALsizei size; + void *ptr; + + size = snd_pcm_frames_to_bytes(self->pcmHandle, avail); + ptr = al_malloc(16, size); + if(ptr) + { + ALCcaptureAlsa_captureSamples(self, ptr, avail); + al_free(self->buffer); + self->buffer = ptr; + self->size = size; + } + } + err = snd_pcm_drop(self->pcmHandle); + if(err < 0) + ERR("drop failed: %s\n", snd_strerror(err)); + self->doCapture = AL_FALSE; +} + +static ALCenum ALCcaptureAlsa_captureSamples(ALCcaptureAlsa *self, ALCvoid *buffer, ALCuint samples) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + + if(self->ring) + { + ll_ringbuffer_read(self->ring, static_cast<char*>(buffer), samples); + return ALC_NO_ERROR; + } + + self->last_avail -= samples; + while(ATOMIC_LOAD(&device->Connected, almemory_order_acquire) && samples > 0) + { + snd_pcm_sframes_t amt = 0; + + if(self->size > 0) + { + /* First get any data stored from the last stop */ + amt = snd_pcm_bytes_to_frames(self->pcmHandle, self->size); + if((snd_pcm_uframes_t)amt > samples) amt = samples; + + amt = snd_pcm_frames_to_bytes(self->pcmHandle, amt); + memcpy(buffer, self->buffer, amt); + + if(self->size > amt) + { + memmove(self->buffer, static_cast<char*>(self->buffer)+amt, self->size - amt); + self->size -= amt; + } + else + { + al_free(self->buffer); + self->buffer = NULL; + self->size = 0; + } + amt = snd_pcm_bytes_to_frames(self->pcmHandle, amt); + } + else if(self->doCapture) + amt = snd_pcm_readi(self->pcmHandle, buffer, samples); + if(amt < 0) + { + ERR("read error: %s\n", snd_strerror(amt)); + + if(amt == -EAGAIN) + continue; + if((amt=snd_pcm_recover(self->pcmHandle, amt, 1)) >= 0) + { + amt = snd_pcm_start(self->pcmHandle); + if(amt >= 0) + amt = snd_pcm_avail_update(self->pcmHandle); + } + if(amt < 0) + { + ERR("restore error: %s\n", snd_strerror(amt)); + aluHandleDisconnect(device, "Capture recovery failure: %s", snd_strerror(amt)); + break; + } + /* If the amount available is less than what's asked, we lost it + * during recovery. So just give silence instead. */ + if((snd_pcm_uframes_t)amt < samples) + break; + continue; + } + + buffer = (ALbyte*)buffer + amt; + samples -= amt; + } + if(samples > 0) + memset(buffer, ((device->FmtType == DevFmtUByte) ? 0x80 : 0), + snd_pcm_frames_to_bytes(self->pcmHandle, samples)); + + return ALC_NO_ERROR; +} + +static ALCuint ALCcaptureAlsa_availableSamples(ALCcaptureAlsa *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + snd_pcm_sframes_t avail = 0; + + if(ATOMIC_LOAD(&device->Connected, almemory_order_acquire) && self->doCapture) + avail = snd_pcm_avail_update(self->pcmHandle); + if(avail < 0) + { + ERR("avail update failed: %s\n", snd_strerror(avail)); + + if((avail=snd_pcm_recover(self->pcmHandle, avail, 1)) >= 0) + { + if(self->doCapture) + avail = snd_pcm_start(self->pcmHandle); + if(avail >= 0) + avail = snd_pcm_avail_update(self->pcmHandle); + } + if(avail < 0) + { + ERR("restore error: %s\n", snd_strerror(avail)); + aluHandleDisconnect(device, "Capture recovery failure: %s", snd_strerror(avail)); + } + } + + if(!self->ring) + { + if(avail < 0) avail = 0; + avail += snd_pcm_bytes_to_frames(self->pcmHandle, self->size); + if(avail > self->last_avail) self->last_avail = avail; + return self->last_avail; + } + + while(avail > 0) + { + ll_ringbuffer_data_t vec[2]; + snd_pcm_sframes_t amt; + + ll_ringbuffer_get_write_vector(self->ring, vec); + if(vec[0].len == 0) break; + + amt = (vec[0].len < (snd_pcm_uframes_t)avail) ? + vec[0].len : (snd_pcm_uframes_t)avail; + amt = snd_pcm_readi(self->pcmHandle, vec[0].buf, amt); + if(amt < 0) + { + ERR("read error: %s\n", snd_strerror(amt)); + + if(amt == -EAGAIN) + continue; + if((amt=snd_pcm_recover(self->pcmHandle, amt, 1)) >= 0) + { + if(self->doCapture) + amt = snd_pcm_start(self->pcmHandle); + if(amt >= 0) + amt = snd_pcm_avail_update(self->pcmHandle); + } + if(amt < 0) + { + ERR("restore error: %s\n", snd_strerror(amt)); + aluHandleDisconnect(device, "Capture recovery failure: %s", snd_strerror(amt)); + break; + } + avail = amt; + continue; + } + + ll_ringbuffer_write_advance(self->ring, amt); + avail -= amt; + } + + return ll_ringbuffer_read_space(self->ring); +} + +static ClockLatency ALCcaptureAlsa_getClockLatency(ALCcaptureAlsa *self) +{ + ALCdevice *device = STATIC_CAST(ALCbackend, self)->mDevice; + snd_pcm_sframes_t delay = 0; + ClockLatency ret; + int err; + + ALCcaptureAlsa_lock(self); + ret.ClockTime = GetDeviceClockTime(device); + if((err=snd_pcm_delay(self->pcmHandle, &delay)) < 0) + { + ERR("Failed to get pcm delay: %s\n", snd_strerror(err)); + delay = 0; + } + if(delay < 0) delay = 0; + ret.Latency = delay * DEVICE_CLOCK_RES / device->Frequency; + ALCcaptureAlsa_unlock(self); + + return ret; +} + + +struct ALCalsaBackendFactory final : public ALCbackendFactory { + ALCalsaBackendFactory() noexcept; +}; + +static ALCboolean ALCalsaBackendFactory_init(ALCalsaBackendFactory* UNUSED(self)) +{ + VECTOR_INIT(PlaybackDevices); + VECTOR_INIT(CaptureDevices); + + if(!alsa_load()) + return ALC_FALSE; + return ALC_TRUE; +} + +static void ALCalsaBackendFactory_deinit(ALCalsaBackendFactory* UNUSED(self)) +{ + clear_devlist(&PlaybackDevices); + VECTOR_DEINIT(PlaybackDevices); + + clear_devlist(&CaptureDevices); + VECTOR_DEINIT(CaptureDevices); + +#ifdef HAVE_DYNLOAD + if(alsa_handle) + CloseLib(alsa_handle); + alsa_handle = NULL; +#endif +} + +static ALCboolean ALCalsaBackendFactory_querySupport(ALCalsaBackendFactory* UNUSED(self), ALCbackend_Type type) +{ + if(type == ALCbackend_Playback || type == ALCbackend_Capture) + return ALC_TRUE; + return ALC_FALSE; +} + +static void ALCalsaBackendFactory_probe(ALCalsaBackendFactory* UNUSED(self), enum DevProbe type, al_string *outnames) +{ + switch(type) + { +#define APPEND_OUTNAME(i) do { \ + if(!alstr_empty((i)->name)) \ + alstr_append_range(outnames, VECTOR_BEGIN((i)->name), \ + VECTOR_END((i)->name)+1); \ +} while(0) + case ALL_DEVICE_PROBE: + probe_devices(SND_PCM_STREAM_PLAYBACK, &PlaybackDevices); + VECTOR_FOR_EACH(const DevMap, PlaybackDevices, APPEND_OUTNAME); + break; + + case CAPTURE_DEVICE_PROBE: + probe_devices(SND_PCM_STREAM_CAPTURE, &CaptureDevices); + VECTOR_FOR_EACH(const DevMap, CaptureDevices, APPEND_OUTNAME); + break; +#undef APPEND_OUTNAME + } +} + +static ALCbackend* ALCalsaBackendFactory_createBackend(ALCalsaBackendFactory* UNUSED(self), ALCdevice *device, ALCbackend_Type type) +{ + if(type == ALCbackend_Playback) + { + ALCplaybackAlsa *backend; + NEW_OBJ(backend, ALCplaybackAlsa)(device); + if(!backend) return NULL; + return STATIC_CAST(ALCbackend, backend); + } + if(type == ALCbackend_Capture) + { + ALCcaptureAlsa *backend; + NEW_OBJ(backend, ALCcaptureAlsa)(device); + if(!backend) return NULL; + return STATIC_CAST(ALCbackend, backend); + } + + return NULL; +} + +DEFINE_ALCBACKENDFACTORY_VTABLE(ALCalsaBackendFactory); + + +ALCalsaBackendFactory::ALCalsaBackendFactory() noexcept + : ALCbackendFactory{GET_VTABLE2(ALCalsaBackendFactory, ALCbackendFactory)} +{ +} + +ALCbackendFactory *ALCalsaBackendFactory_getFactory(void) +{ + static ALCalsaBackendFactory factory{}; + return STATIC_CAST(ALCbackendFactory, &factory); +} |