329 lines
7.9 KiB
C
329 lines
7.9 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <memory.h>
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#include <unistd.h>
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#include <errno.h>
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#include <math.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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#include <sys/soundcard.h>
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/*
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* The OSS documentation talks about SOUND_MIXER_READ, but the header
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* only contains MIXER_READ. Play safe. Same for WRITE.
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*/
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#ifndef SOUND_MIXER_READ
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#define SOUND_MIXER_READ MIXER_READ
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#endif
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#ifndef SOUND_MIXER_WRITE
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#define SOUND_MIXER_WRITE MIXER_WRITE
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#endif
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static char *oss_device;
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typedef struct {
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int fd;
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int killNow;
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ALvoid *thread;
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void *mix_data;
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int data_size;
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int silence;
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} oss_data;
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static int log2i(ALCuint x)
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{
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int y = 0;
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while (x > 1)
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{
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x >>= 1;
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y++;
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}
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return y;
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}
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static ALuint OSSProc(ALvoid *ptr)
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{
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ALCdevice *pDevice = (ALCdevice*)ptr;
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oss_data *data = (oss_data*)pDevice->ExtraData;
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int remaining;
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int wrote;
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while(!data->killNow)
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{
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SuspendContext(NULL);
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if(pDevice->Context)
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aluMixData(pDevice->Context,data->mix_data,data->data_size,pDevice->Format);
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else
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memset(data->mix_data,data->silence,data->data_size);
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ProcessContext(NULL);
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remaining = data->data_size;
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while(remaining > 0)
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{
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wrote = write(data->fd, data->mix_data+data->data_size-remaining, remaining);
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if(wrote < 0)
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{
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fprintf(stderr, "write failed: %s\n", strerror(errno));
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break;
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}
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if(wrote == 0)
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{
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usleep(1000);
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continue;
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}
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remaining -= wrote;
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}
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}
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return 0;
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}
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static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
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{
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int numFragmentsLogSize;
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int log2FragmentSize;
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unsigned int periods;
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audio_buf_info info;
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char driver[64];
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int numChannels;
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oss_data *data;
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int ossFormat;
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int ossSpeed;
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int i;
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strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
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driver[sizeof(driver)-1] = 0;
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if(deviceName)
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{
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if(strcmp(deviceName, oss_device))
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return ALC_FALSE;
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}
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if(deviceName)
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strcpy(device->szDeviceName, deviceName);
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else
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strcpy(device->szDeviceName, oss_device);
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data = (oss_data*)calloc(1, sizeof(oss_data));
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data->killNow = 0;
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data->fd = open(driver, O_WRONLY);
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if(data->fd == -1)
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{
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free(data);
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return ALC_FALSE;
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}
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switch(device->Format)
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{
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case AL_FORMAT_MONO8:
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case AL_FORMAT_STEREO8:
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case AL_FORMAT_QUAD8:
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data->silence = 0x80;
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ossFormat = AFMT_U8;
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break;
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case AL_FORMAT_MONO16:
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case AL_FORMAT_STEREO16:
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case AL_FORMAT_QUAD16:
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data->silence = 0;
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ossFormat = AFMT_S16_NE;
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break;
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default:
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ossFormat = -1;
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fprintf(stderr, "Unknown format?! %x\n", device->Format);
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}
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periods = GetConfigValueInt("oss", "periods", 4);
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if((int)periods < 0)
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periods = 4;
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numChannels = device->Channels;
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ossSpeed = device->Frequency;
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log2FragmentSize = log2i(device->UpdateFreq * device->FrameSize / periods);
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/* according to the OSS spec, 16 bytes are the minimum */
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if (log2FragmentSize < 4)
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log2FragmentSize = 4;
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numFragmentsLogSize = (periods << 16) | log2FragmentSize;
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#define ok(func, str) (i=(func),((i<0)?fprintf(stderr,"%s failed\n", str),0:1))
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if (!(ok(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize), "set fragment") &&
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ok(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat), "set format") &&
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ok(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels), "set channels") &&
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ok(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed), "set speed") &&
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ok(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info), "get space")))
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{
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close(data->fd);
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free(data);
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return ALC_FALSE;
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}
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#undef ok
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device->Channels = numChannels;
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device->Frequency = ossSpeed;
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device->Format = 0;
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if(ossFormat == AFMT_U8)
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{
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if(device->Channels == 1)
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{
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device->Format = AL_FORMAT_MONO8;
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device->FrameSize = 1;
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}
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else if(device->Channels == 2)
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{
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device->Format = AL_FORMAT_STEREO8;
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device->FrameSize = 2;
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}
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else if(device->Channels == 4)
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{
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device->Format = AL_FORMAT_QUAD8;
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device->FrameSize = 4;
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}
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}
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else if(ossFormat == AFMT_S16_NE)
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{
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if(device->Channels == 1)
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{
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device->Format = AL_FORMAT_MONO16;
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device->FrameSize = 2;
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}
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else if(device->Channels == 2)
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{
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device->Format = AL_FORMAT_STEREO16;
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device->FrameSize = 4;
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}
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else if(device->Channels == 4)
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{
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device->Format = AL_FORMAT_QUAD16;
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device->FrameSize = 8;
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}
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}
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if(!device->Format)
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{
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fprintf(stderr, "Unknown returned format/channel %#x/%d!\n", ossFormat, numChannels);
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close(data->fd);
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free(data);
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return ALC_FALSE;
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}
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device->UpdateFreq = info.fragsize / device->FrameSize;
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data->data_size = device->UpdateFreq * device->FrameSize;
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data->mix_data = calloc(1, data->data_size);
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device->MaxNoOfSources = 256;
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device->ExtraData = data;
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data->thread = StartThread(OSSProc, device);
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if(data->thread == NULL)
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{
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device->ExtraData = NULL;
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free(data->mix_data);
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free(data);
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return ALC_FALSE;
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}
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return ALC_TRUE;
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}
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static void oss_close_playback(ALCdevice *device)
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{
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oss_data *data = (oss_data*)device->ExtraData;
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data->killNow = 1;
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StopThread(data->thread);
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close(data->fd);
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free(data->mix_data);
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free(data);
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device->ExtraData = NULL;
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}
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static ALCboolean oss_open_capture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
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{
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(void)pDevice;
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(void)deviceName;
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(void)frequency;
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(void)format;
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(void)SampleSize;
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return ALC_FALSE;
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}
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static void oss_close_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void oss_start_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void oss_stop_capture(ALCdevice *pDevice)
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{
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(void)pDevice;
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}
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static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
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{
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(void)pDevice;
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(void)pBuffer;
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(void)lSamples;
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}
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static ALCuint oss_available_samples(ALCdevice *pDevice)
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{
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(void)pDevice;
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return 0;
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}
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BackendFuncs oss_funcs = {
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oss_open_playback,
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oss_close_playback,
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oss_open_capture,
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oss_close_capture,
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oss_start_capture,
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oss_stop_capture,
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oss_capture_samples,
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oss_available_samples
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};
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void alc_oss_init(BackendFuncs *func_list)
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{
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*func_list = oss_funcs;
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oss_device = AppendDeviceList("OSS Software");
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AppendAllDeviceList(oss_device);
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}
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