Move backend sources to a separate sub-directory

1 files changed, 536 insertions, 0 deletions

diff --git a/Alc/backends/oss.c b/Alc/backends/oss.c
new file mode 100644
index 00000000..724b23c2
--- /dev/null
+++ b/Alc/backends/oss.c
@@ -0,0 +1,536 @@
+/**
+ * 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 <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <memory.h>
+#include <unistd.h>
+#include <errno.h>
+#include <math.h>
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+
+#include <sys/soundcard.h>
+
+/*
+ * The OSS documentation talks about SOUND_MIXER_READ, but the header
+ * only contains MIXER_READ. Play safe. Same for WRITE.
+ */
+#ifndef SOUND_MIXER_READ
+#define SOUND_MIXER_READ MIXER_READ
+#endif
+#ifndef SOUND_MIXER_WRITE
+#define SOUND_MIXER_WRITE MIXER_WRITE
+#endif
+
+static const ALCchar oss_device[] = "OSS Default";
+
+typedef struct {
+    int fd;
+    volatile int killNow;
+    ALvoid *thread;
+
+    ALubyte *mix_data;
+    int data_size;
+
+    RingBuffer *ring;
+    int doCapture;
+} oss_data;
+
+
+static int log2i(ALCuint x)
+{
+    int y = 0;
+    while (x > 1)
+    {
+        x >>= 1;
+        y++;
+    }
+    return y;
+}
+
+
+static ALuint OSSProc(ALvoid *ptr)
+{
+    ALCdevice *pDevice = (ALCdevice*)ptr;
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    ALint frameSize;
+    ssize_t wrote;
+
+    SetRTPriority();
+
+    frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
+
+    while(!data->killNow && pDevice->Connected)
+    {
+        ALint len = data->data_size;
+        ALubyte *WritePtr = data->mix_data;
+
+        aluMixData(pDevice, WritePtr, len/frameSize);
+        while(len > 0 && !data->killNow)
+        {
+            wrote = write(data->fd, WritePtr, len);
+            if(wrote < 0)
+            {
+                if(errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
+                {
+                    ERR("write failed: %s\n", strerror(errno));
+                    aluHandleDisconnect(pDevice);
+                    break;
+                }
+
+                Sleep(1);
+                continue;
+            }
+
+            len -= wrote;
+            WritePtr += wrote;
+        }
+    }
+
+    return 0;
+}
+
+static ALuint OSSCaptureProc(ALvoid *ptr)
+{
+    ALCdevice *pDevice = (ALCdevice*)ptr;
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    int frameSize;
+    int amt;
+
+    SetRTPriority();
+
+    frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
+
+    while(!data->killNow)
+    {
+        amt = read(data->fd, data->mix_data, data->data_size);
+        if(amt < 0)
+        {
+            ERR("read failed: %s\n", strerror(errno));
+            aluHandleDisconnect(pDevice);
+            break;
+        }
+        if(amt == 0)
+        {
+            Sleep(1);
+            continue;
+        }
+        if(data->doCapture)
+            WriteRingBuffer(data->ring, data->mix_data, amt/frameSize);
+    }
+
+    return 0;
+}
+
+static ALCboolean oss_open_playback(ALCdevice *device, const ALCchar *deviceName)
+{
+    char driver[64];
+    oss_data *data;
+
+    strncpy(driver, GetConfigValue("oss", "device", "/dev/dsp"), sizeof(driver)-1);
+    driver[sizeof(driver)-1] = 0;
+    if(!deviceName)
+        deviceName = oss_device;
+    else if(strcmp(deviceName, oss_device) != 0)
+        return ALC_FALSE;
+
+    data = (oss_data*)calloc(1, sizeof(oss_data));
+    data->killNow = 0;
+
+    data->fd = open(driver, O_WRONLY);
+    if(data->fd == -1)
+    {
+        free(data);
+        ERR("Could not open %s: %s\n", driver, strerror(errno));
+        return ALC_FALSE;
+    }
+
+    device->szDeviceName = strdup(deviceName);
+    device->ExtraData = data;
+    return ALC_TRUE;
+}
+
+static void oss_close_playback(ALCdevice *device)
+{
+    oss_data *data = (oss_data*)device->ExtraData;
+
+    close(data->fd);
+    free(data);
+    device->ExtraData = NULL;
+}
+
+static ALCboolean oss_reset_playback(ALCdevice *device)
+{
+    oss_data *data = (oss_data*)device->ExtraData;
+    int numFragmentsLogSize;
+    int log2FragmentSize;
+    unsigned int periods;
+    audio_buf_info info;
+    ALuint frameSize;
+    int numChannels;
+    int ossFormat;
+    int ossSpeed;
+    char *err;
+
+    switch(device->FmtType)
+    {
+        case DevFmtByte:
+            ossFormat = AFMT_S8;
+            break;
+        case DevFmtUByte:
+            ossFormat = AFMT_U8;
+            break;
+        case DevFmtUShort:
+        case DevFmtFloat:
+            device->FmtType = DevFmtShort;
+            /* fall-through */
+        case DevFmtShort:
+            ossFormat = AFMT_S16_NE;
+            break;
+    }
+
+    periods = device->NumUpdates;
+    numChannels = ChannelsFromDevFmt(device->FmtChans);
+    frameSize = numChannels * BytesFromDevFmt(device->FmtType);
+
+    ossSpeed = device->Frequency;
+    log2FragmentSize = log2i(device->UpdateSize * frameSize);
+
+    /* according to the OSS spec, 16 bytes are the minimum */
+    if (log2FragmentSize < 4)
+        log2FragmentSize = 4;
+    /* Subtract one period since the temp mixing buffer counts as one. Still
+     * need at least two on the card, though. */
+    if(periods > 2) periods--;
+    numFragmentsLogSize = (periods << 16) | log2FragmentSize;
+
+#define CHECKERR(func) if((func) < 0) {                                       \
+    err = #func;                                                              \
+    goto err;                                                                 \
+}
+    /* Don't fail if SETFRAGMENT fails. We can handle just about anything
+     * that's reported back via GETOSPACE */
+    ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize);
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETOSPACE, &info));
+    if(0)
+    {
+    err:
+        ERR("%s failed: %s\n", err, strerror(errno));
+        return ALC_FALSE;
+    }
+#undef CHECKERR
+
+    if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
+    {
+        ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
+        return ALC_FALSE;
+    }
+
+    if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
+         (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
+         (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
+    {
+        ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
+        return ALC_FALSE;
+    }
+
+    if(device->Frequency != (ALuint)ossSpeed)
+    {
+        if((device->Flags&DEVICE_FREQUENCY_REQUEST))
+            ERR("Failed to set %dhz, got %dhz instead\n", device->Frequency, ossSpeed);
+        device->Flags &= ~DEVICE_FREQUENCY_REQUEST;
+        device->Frequency = ossSpeed;
+    }
+    device->UpdateSize = info.fragsize / frameSize;
+    device->NumUpdates = info.fragments + 1;
+
+    data->data_size = device->UpdateSize * frameSize;
+    data->mix_data = calloc(1, data->data_size);
+
+    SetDefaultChannelOrder(device);
+
+    data->thread = StartThread(OSSProc, device);
+    if(data->thread == NULL)
+    {
+        free(data->mix_data);
+        data->mix_data = NULL;
+        return ALC_FALSE;
+    }
+
+    return ALC_TRUE;
+}
+
+static void oss_stop_playback(ALCdevice *device)
+{
+    oss_data *data = (oss_data*)device->ExtraData;
+
+    if(!data->thread)
+        return;
+
+    data->killNow = 1;
+    StopThread(data->thread);
+    data->thread = NULL;
+
+    data->killNow = 0;
+    if(ioctl(data->fd, SNDCTL_DSP_RESET) != 0)
+        ERR("Error resetting device: %s\n", strerror(errno));
+
+    free(data->mix_data);
+    data->mix_data = NULL;
+}
+
+
+static ALCboolean oss_open_capture(ALCdevice *device, const ALCchar *deviceName)
+{
+    int numFragmentsLogSize;
+    int log2FragmentSize;
+    unsigned int periods;
+    audio_buf_info info;
+    ALuint frameSize;
+    int numChannels;
+    char driver[64];
+    oss_data *data;
+    int ossFormat;
+    int ossSpeed;
+    char *err;
+
+    strncpy(driver, GetConfigValue("oss", "capture", "/dev/dsp"), sizeof(driver)-1);
+    driver[sizeof(driver)-1] = 0;
+    if(!deviceName)
+        deviceName = oss_device;
+    else if(strcmp(deviceName, oss_device) != 0)
+        return ALC_FALSE;
+
+    data = (oss_data*)calloc(1, sizeof(oss_data));
+    data->killNow = 0;
+
+    data->fd = open(driver, O_RDONLY);
+    if(data->fd == -1)
+    {
+        free(data);
+        ERR("Could not open %s: %s\n", driver, strerror(errno));
+        return ALC_FALSE;
+    }
+
+    switch(device->FmtType)
+    {
+        case DevFmtByte:
+            ossFormat = AFMT_S8;
+            break;
+        case DevFmtUByte:
+            ossFormat = AFMT_U8;
+            break;
+        case DevFmtShort:
+            ossFormat = AFMT_S16_NE;
+            break;
+        case DevFmtUShort:
+        case DevFmtFloat:
+            free(data);
+            ERR("%s capture samples not supported on OSS\n", DevFmtTypeString(device->FmtType));
+            return ALC_FALSE;
+    }
+
+    periods = 4;
+    numChannels = ChannelsFromDevFmt(device->FmtChans);
+    frameSize = numChannels * BytesFromDevFmt(device->FmtType);
+    ossSpeed = device->Frequency;
+    log2FragmentSize = log2i(device->UpdateSize * device->NumUpdates *
+                             frameSize / periods);
+
+    /* according to the OSS spec, 16 bytes are the minimum */
+    if (log2FragmentSize < 4)
+        log2FragmentSize = 4;
+    numFragmentsLogSize = (periods << 16) | log2FragmentSize;
+
+#define CHECKERR(func) if((func) < 0) {                                       \
+    err = #func;                                                              \
+    goto err;                                                                 \
+}
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFRAGMENT, &numFragmentsLogSize));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_SETFMT, &ossFormat));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_CHANNELS, &numChannels));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_SPEED, &ossSpeed));
+    CHECKERR(ioctl(data->fd, SNDCTL_DSP_GETISPACE, &info));
+    if(0)
+    {
+    err:
+        ERR("%s failed: %s\n", err, strerror(errno));
+        close(data->fd);
+        free(data);
+        return ALC_FALSE;
+    }
+#undef CHECKERR
+
+    if((int)ChannelsFromDevFmt(device->FmtChans) != numChannels)
+    {
+        ERR("Failed to set %s, got %d channels instead\n", DevFmtChannelsString(device->FmtChans), numChannels);
+        close(data->fd);
+        free(data);
+        return ALC_FALSE;
+    }
+
+    if(!((ossFormat == AFMT_S8 && device->FmtType == DevFmtByte) ||
+         (ossFormat == AFMT_U8 && device->FmtType == DevFmtUByte) ||
+         (ossFormat == AFMT_S16_NE && device->FmtType == DevFmtShort)))
+    {
+        ERR("Failed to set %s samples, got OSS format %#x\n", DevFmtTypeString(device->FmtType), ossFormat);
+        close(data->fd);
+        free(data);
+        return ALC_FALSE;
+    }
+
+    data->ring = CreateRingBuffer(frameSize, device->UpdateSize * device->NumUpdates);
+    if(!data->ring)
+    {
+        ERR("Ring buffer create failed\n");
+        close(data->fd);
+        free(data);
+        return ALC_FALSE;
+    }
+
+    data->data_size = info.fragsize;
+    data->mix_data = calloc(1, data->data_size);
+
+    device->ExtraData = data;
+    data->thread = StartThread(OSSCaptureProc, device);
+    if(data->thread == NULL)
+    {
+        device->ExtraData = NULL;
+        free(data->mix_data);
+        free(data);
+        return ALC_FALSE;
+    }
+
+    device->szDeviceName = strdup(deviceName);
+    return ALC_TRUE;
+}
+
+static void oss_close_capture(ALCdevice *device)
+{
+    oss_data *data = (oss_data*)device->ExtraData;
+    data->killNow = 1;
+    StopThread(data->thread);
+
+    close(data->fd);
+
+    DestroyRingBuffer(data->ring);
+
+    free(data->mix_data);
+    free(data);
+    device->ExtraData = NULL;
+}
+
+static void oss_start_capture(ALCdevice *pDevice)
+{
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    data->doCapture = 1;
+}
+
+static void oss_stop_capture(ALCdevice *pDevice)
+{
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    data->doCapture = 0;
+}
+
+static void oss_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
+{
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    if(lSamples <= (ALCuint)RingBufferSize(data->ring))
+        ReadRingBuffer(data->ring, pBuffer, lSamples);
+    else
+        alcSetError(pDevice, ALC_INVALID_VALUE);
+}
+
+static ALCuint oss_available_samples(ALCdevice *pDevice)
+{
+    oss_data *data = (oss_data*)pDevice->ExtraData;
+    return RingBufferSize(data->ring);
+}
+
+
+static const BackendFuncs oss_funcs = {
+    oss_open_playback,
+    oss_close_playback,
+    oss_reset_playback,
+    oss_stop_playback,
+    oss_open_capture,
+    oss_close_capture,
+    oss_start_capture,
+    oss_stop_capture,
+    oss_capture_samples,
+    oss_available_samples
+};
+
+ALCboolean alc_oss_init(BackendFuncs *func_list)
+{
+    *func_list = oss_funcs;
+    return ALC_TRUE;
+}
+
+void alc_oss_deinit(void)
+{
+}
+
+void alc_oss_probe(enum DevProbe type)
+{
+    switch(type)
+    {
+        case DEVICE_PROBE:
+        {
+#ifdef HAVE_STAT
+            struct stat buf;
+            if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
+#endif
+                AppendDeviceList(oss_device);
+        }
+        break;
+
+        case ALL_DEVICE_PROBE:
+        {
+#ifdef HAVE_STAT
+            struct stat buf;
+            if(stat(GetConfigValue("oss", "device", "/dev/dsp"), &buf) == 0)
+#endif
+                AppendAllDeviceList(oss_device);
+        }
+        break;
+
+        case CAPTURE_DEVICE_PROBE:
+        {
+#ifdef HAVE_STAT
+            struct stat buf;
+            if(stat(GetConfigValue("oss", "capture", "/dev/dsp"), &buf) == 0)
+#endif
+                AppendCaptureDeviceList(oss_device);
+        }
+        break;
+    }
+}