Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1353 insertions, 0 deletions

diff --git a/media/libcubeb/src/cubeb_oss.c b/media/libcubeb/src/cubeb_oss.c
new file mode 100644
index 0000000000..8718fa3067
--- /dev/null
+++ b/media/libcubeb/src/cubeb_oss.c
@@ -0,0 +1,1353 @@
+/*
+ * Copyright © 2019-2020 Nia Alarie <nia@NetBSD.org>
+ * Copyright © 2020 Ka Ho Ng <khng300@gmail.com>
+ * Copyright © 2020 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Ka Ho Ng
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * This program is made available under an ISC-style license.  See the
+ * accompanying file LICENSE for details.
+ */
+
+#include "cubeb-internal.h"
+#include "cubeb/cubeb.h"
+#include "cubeb_mixer.h"
+#include "cubeb_strings.h"
+#include "cubeb_tracing.h"
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <poll.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/soundcard.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* Supported well by most hardware. */
+#ifndef OSS_PREFER_RATE
+#define OSS_PREFER_RATE (48000)
+#endif
+
+/* Standard acceptable minimum. */
+#ifndef OSS_LATENCY_MS
+#define OSS_LATENCY_MS (8)
+#endif
+
+#ifndef OSS_NFRAGS
+#define OSS_NFRAGS (4)
+#endif
+
+#ifndef OSS_DEFAULT_DEVICE
+#define OSS_DEFAULT_DEVICE "/dev/dsp"
+#endif
+
+#ifndef OSS_DEFAULT_MIXER
+#define OSS_DEFAULT_MIXER "/dev/mixer"
+#endif
+
+#define ENV_AUDIO_DEVICE "AUDIO_DEVICE"
+
+#ifndef OSS_MAX_CHANNELS
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+/*
+ * The current maximum number of channels supported
+ * on FreeBSD is 8.
+ *
+ * Reference: FreeBSD 12.1-RELEASE
+ */
+#define OSS_MAX_CHANNELS (8)
+#elif defined(__sun__)
+/*
+ * The current maximum number of channels supported
+ * on Illumos is 16.
+ *
+ * Reference: PSARC 2008/318
+ */
+#define OSS_MAX_CHANNELS (16)
+#else
+#define OSS_MAX_CHANNELS (2)
+#endif
+#endif
+
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+#define SNDSTAT_BEGIN_STR "Installed devices:"
+#define SNDSTAT_USER_BEGIN_STR "Installed devices from userspace:"
+#define SNDSTAT_FV_BEGIN_STR "File Versions:"
+#endif
+
+static struct cubeb_ops const oss_ops;
+
+struct cubeb {
+  struct cubeb_ops const * ops;
+
+  /* Our intern string store */
+  pthread_mutex_t mutex; /* protects devid_strs */
+  cubeb_strings * devid_strs;
+};
+
+struct oss_stream {
+  oss_devnode_t name;
+  int fd;
+  void * buf;
+  unsigned int bufframes;
+  unsigned int maxframes;
+
+  struct stream_info {
+    int channels;
+    int sample_rate;
+    int fmt;
+    int precision;
+  } info;
+
+  unsigned int frame_size; /* precision in bytes * channels */
+  bool floating;
+};
+
+struct cubeb_stream {
+  struct cubeb * context;
+  void * user_ptr;
+  pthread_t thread;
+  bool doorbell;              /* (m) */
+  pthread_cond_t doorbell_cv; /* (m) */
+  pthread_cond_t stopped_cv;  /* (m) */
+  pthread_mutex_t mtx; /* Members protected by this should be marked (m) */
+  bool thread_created; /* (m) */
+  bool running;        /* (m) */
+  bool destroying;     /* (m) */
+  cubeb_state state;   /* (m) */
+  float volume /* (m) */;
+  struct oss_stream play;
+  struct oss_stream record;
+  cubeb_data_callback data_cb;
+  cubeb_state_callback state_cb;
+  uint64_t frames_written /* (m) */;
+};
+
+static char const *
+oss_cubeb_devid_intern(cubeb * context, char const * devid)
+{
+  char const * is;
+  pthread_mutex_lock(&context->mutex);
+  is = cubeb_strings_intern(context->devid_strs, devid);
+  pthread_mutex_unlock(&context->mutex);
+  return is;
+}
+
+int
+oss_init(cubeb ** context, char const * context_name)
+{
+  cubeb * c;
+
+  (void)context_name;
+  if ((c = calloc(1, sizeof(cubeb))) == NULL) {
+    return CUBEB_ERROR;
+  }
+
+  if (cubeb_strings_init(&c->devid_strs) == CUBEB_ERROR) {
+    goto fail;
+  }
+
+  if (pthread_mutex_init(&c->mutex, NULL) != 0) {
+    goto fail;
+  }
+
+  c->ops = &oss_ops;
+  *context = c;
+  return CUBEB_OK;
+
+fail:
+  cubeb_strings_destroy(c->devid_strs);
+  free(c);
+  return CUBEB_ERROR;
+}
+
+static void
+oss_destroy(cubeb * context)
+{
+  pthread_mutex_destroy(&context->mutex);
+  cubeb_strings_destroy(context->devid_strs);
+  free(context);
+}
+
+static char const *
+oss_get_backend_id(cubeb * context)
+{
+  return "oss";
+}
+
+static int
+oss_get_preferred_sample_rate(cubeb * context, uint32_t * rate)
+{
+  (void)context;
+
+  *rate = OSS_PREFER_RATE;
+  return CUBEB_OK;
+}
+
+static int
+oss_get_max_channel_count(cubeb * context, uint32_t * max_channels)
+{
+  (void)context;
+
+  *max_channels = OSS_MAX_CHANNELS;
+  return CUBEB_OK;
+}
+
+static int
+oss_get_min_latency(cubeb * context, cubeb_stream_params params,
+                    uint32_t * latency_frames)
+{
+  (void)context;
+
+  *latency_frames = (OSS_LATENCY_MS * params.rate) / 1000;
+  return CUBEB_OK;
+}
+
+static void
+oss_free_cubeb_device_info_strings(cubeb_device_info * cdi)
+{
+  free((char *)cdi->device_id);
+  free((char *)cdi->friendly_name);
+  free((char *)cdi->group_id);
+  cdi->device_id = NULL;
+  cdi->friendly_name = NULL;
+  cdi->group_id = NULL;
+}
+
+#if defined(__FreeBSD__) || defined(__DragonFly__)
+/*
+ * Check if the specified DSP is okay for the purpose specified
+ * in type. Here type can only specify one operation each time
+ * this helper is called.
+ *
+ * Return 0 if OK, otherwise 1.
+ */
+static int
+oss_probe_open(const char * dsppath, cubeb_device_type type, int * fdp,
+               oss_audioinfo * resai)
+{
+  oss_audioinfo ai;
+  int error;
+  int oflags = (type == CUBEB_DEVICE_TYPE_INPUT) ? O_RDONLY : O_WRONLY;
+  int dspfd = open(dsppath, oflags);
+  if (dspfd == -1)
+    return 1;
+
+  ai.dev = -1;
+  error = ioctl(dspfd, SNDCTL_AUDIOINFO, &ai);
+  if (error < 0) {
+    close(dspfd);
+    return 1;
+  }
+
+  if (resai)
+    *resai = ai;
+  if (fdp)
+    *fdp = dspfd;
+  else
+    close(dspfd);
+  return 0;
+}
+
+struct sndstat_info {
+  oss_devnode_t devname;
+  const char * desc;
+  cubeb_device_type type;
+  int preferred;
+};
+
+static int
+oss_sndstat_line_parse(char * line, int is_ud, struct sndstat_info * sinfo)
+{
+  char *matchptr = line, *n = NULL;
+  struct sndstat_info res;
+
+  memset(&res, 0, sizeof(res));
+
+  n = strchr(matchptr, ':');
+  if (n == NULL)
+    goto fail;
+  if (is_ud == 0) {
+    unsigned int devunit;
+
+    if (sscanf(matchptr, "pcm%u: ", &devunit) < 1)
+      goto fail;
+
+    if (snprintf(res.devname, sizeof(res.devname), "/dev/dsp%u", devunit) < 1)
+      goto fail;
+  } else {
+    if (n - matchptr >= (ssize_t)(sizeof(res.devname) - strlen("/dev/")))
+      goto fail;
+
+    strlcpy(res.devname, "/dev/", sizeof(res.devname));
+    strncat(res.devname, matchptr, n - matchptr);
+  }
+  matchptr = n + 1;
+
+  n = strchr(matchptr, '<');
+  if (n == NULL)
+    goto fail;
+  matchptr = n + 1;
+  n = strrchr(matchptr, '>');
+  if (n == NULL)
+    goto fail;
+  *n = 0;
+  res.desc = matchptr;
+  matchptr = n + 1;
+
+  n = strchr(matchptr, '(');
+  if (n == NULL)
+    goto fail;
+  matchptr = n + 1;
+  n = strrchr(matchptr, ')');
+  if (n == NULL)
+    goto fail;
+  *n = 0;
+  if (!isdigit(matchptr[0])) {
+    if (strstr(matchptr, "play") != NULL)
+      res.type |= CUBEB_DEVICE_TYPE_OUTPUT;
+    if (strstr(matchptr, "rec") != NULL)
+      res.type |= CUBEB_DEVICE_TYPE_INPUT;
+  } else {
+    int p, r;
+    if (sscanf(matchptr, "%dp:%*dv/%dr:%*dv", &p, &r) != 2)
+      goto fail;
+    if (p > 0)
+      res.type |= CUBEB_DEVICE_TYPE_OUTPUT;
+    if (r > 0)
+      res.type |= CUBEB_DEVICE_TYPE_INPUT;
+  }
+  matchptr = n + 1;
+  if (strstr(matchptr, "default") != NULL)
+    res.preferred = 1;
+
+  *sinfo = res;
+  return 0;
+
+fail:
+  return 1;
+}
+
+/*
+ * XXX: On FreeBSD we have to rely on SNDCTL_CARDINFO to get all
+ * the usable audio devices currently, as SNDCTL_AUDIOINFO will
+ * never return directly usable audio device nodes.
+ */
+static int
+oss_enumerate_devices(cubeb * context, cubeb_device_type type,
+                      cubeb_device_collection * collection)
+{
+  cubeb_device_info * devinfop = NULL;
+  char * line = NULL;
+  size_t linecap = 0;
+  FILE * sndstatfp = NULL;
+  int collection_cnt = 0;
+  int is_ud = 0;
+  int skipall = 0;
+
+  devinfop = calloc(1, sizeof(cubeb_device_info));
+  if (devinfop == NULL)
+    goto fail;
+
+  sndstatfp = fopen("/dev/sndstat", "r");
+  if (sndstatfp == NULL)
+    goto fail;
+  while (getline(&line, &linecap, sndstatfp) > 0) {
+    const char * devid = NULL;
+    struct sndstat_info sinfo;
+    oss_audioinfo ai;
+
+    if (!strncmp(line, SNDSTAT_FV_BEGIN_STR, strlen(SNDSTAT_FV_BEGIN_STR))) {
+      skipall = 1;
+      continue;
+    }
+    if (!strncmp(line, SNDSTAT_BEGIN_STR, strlen(SNDSTAT_BEGIN_STR))) {
+      is_ud = 0;
+      skipall = 0;
+      continue;
+    }
+    if (!strncmp(line, SNDSTAT_USER_BEGIN_STR,
+                 strlen(SNDSTAT_USER_BEGIN_STR))) {
+      is_ud = 1;
+      skipall = 0;
+      continue;
+    }
+    if (skipall || isblank(line[0]))
+      continue;
+
+    if (oss_sndstat_line_parse(line, is_ud, &sinfo))
+      continue;
+
+    devinfop[collection_cnt].type = 0;
+    switch (sinfo.type) {
+    case CUBEB_DEVICE_TYPE_INPUT:
+      if (type & CUBEB_DEVICE_TYPE_OUTPUT)
+        continue;
+      break;
+    case CUBEB_DEVICE_TYPE_OUTPUT:
+      if (type & CUBEB_DEVICE_TYPE_INPUT)
+        continue;
+      break;
+    case 0:
+      continue;
+    }
+
+    if (oss_probe_open(sinfo.devname, type, NULL, &ai))
+      continue;
+
+    devid = oss_cubeb_devid_intern(context, sinfo.devname);
+    if (devid == NULL)
+      continue;
+
+    devinfop[collection_cnt].device_id = strdup(sinfo.devname);
+    asprintf((char **)&devinfop[collection_cnt].friendly_name, "%s: %s",
+             sinfo.devname, sinfo.desc);
+    devinfop[collection_cnt].group_id = strdup(sinfo.devname);
+    devinfop[collection_cnt].vendor_name = NULL;
+    if (devinfop[collection_cnt].device_id == NULL ||
+        devinfop[collection_cnt].friendly_name == NULL ||
+        devinfop[collection_cnt].group_id == NULL) {
+      oss_free_cubeb_device_info_strings(&devinfop[collection_cnt]);
+      continue;
+    }
+
+    devinfop[collection_cnt].type = type;
+    devinfop[collection_cnt].devid = devid;
+    devinfop[collection_cnt].state = CUBEB_DEVICE_STATE_ENABLED;
+    devinfop[collection_cnt].preferred =
+        (sinfo.preferred) ? CUBEB_DEVICE_PREF_ALL : CUBEB_DEVICE_PREF_NONE;
+    devinfop[collection_cnt].format = CUBEB_DEVICE_FMT_S16NE;
+    devinfop[collection_cnt].default_format = CUBEB_DEVICE_FMT_S16NE;
+    devinfop[collection_cnt].max_channels = ai.max_channels;
+    devinfop[collection_cnt].default_rate = OSS_PREFER_RATE;
+    devinfop[collection_cnt].max_rate = ai.max_rate;
+    devinfop[collection_cnt].min_rate = ai.min_rate;
+    devinfop[collection_cnt].latency_lo = 0;
+    devinfop[collection_cnt].latency_hi = 0;
+
+    collection_cnt++;
+
+    void * newp =
+        reallocarray(devinfop, collection_cnt + 1, sizeof(cubeb_device_info));
+    if (newp == NULL)
+      goto fail;
+    devinfop = newp;
+  }
+
+  free(line);
+  fclose(sndstatfp);
+
+  collection->count = collection_cnt;
+  collection->device = devinfop;
+
+  return CUBEB_OK;
+
+fail:
+  free(line);
+  if (sndstatfp)
+    fclose(sndstatfp);
+  free(devinfop);
+  return CUBEB_ERROR;
+}
+
+#else
+
+static int
+oss_enumerate_devices(cubeb * context, cubeb_device_type type,
+                      cubeb_device_collection * collection)
+{
+  oss_sysinfo si;
+  int error, i;
+  cubeb_device_info * devinfop = NULL;
+  int collection_cnt = 0;
+  int mixer_fd = -1;
+
+  mixer_fd = open(OSS_DEFAULT_MIXER, O_RDWR);
+  if (mixer_fd == -1) {
+    LOG("Failed to open mixer %s. errno: %d", OSS_DEFAULT_MIXER, errno);
+    return CUBEB_ERROR;
+  }
+
+  error = ioctl(mixer_fd, SNDCTL_SYSINFO, &si);
+  if (error) {
+    LOG("Failed to run SNDCTL_SYSINFO on mixer %s. errno: %d",
+        OSS_DEFAULT_MIXER, errno);
+    goto fail;
+  }
+
+  devinfop = calloc(si.numaudios, sizeof(cubeb_device_info));
+  if (devinfop == NULL)
+    goto fail;
+
+  collection->count = 0;
+  for (i = 0; i < si.numaudios; i++) {
+    oss_audioinfo ai;
+    cubeb_device_info cdi = {0};
+    const char * devid = NULL;
+
+    ai.dev = i;
+    error = ioctl(mixer_fd, SNDCTL_AUDIOINFO, &ai);
+    if (error)
+      goto fail;
+
+    assert(ai.dev < si.numaudios);
+    if (!ai.enabled)
+      continue;
+
+    cdi.type = 0;
+    switch (ai.caps & DSP_CAP_DUPLEX) {
+    case DSP_CAP_INPUT:
+      if (type & CUBEB_DEVICE_TYPE_OUTPUT)
+        continue;
+      break;
+    case DSP_CAP_OUTPUT:
+      if (type & CUBEB_DEVICE_TYPE_INPUT)
+        continue;
+      break;
+    case 0:
+      continue;
+    }
+    cdi.type = type;
+
+    devid = oss_cubeb_devid_intern(context, ai.devnode);
+    cdi.device_id = strdup(ai.name);
+    cdi.friendly_name = strdup(ai.name);
+    cdi.group_id = strdup(ai.name);
+    if (devid == NULL || cdi.device_id == NULL || cdi.friendly_name == NULL ||
+        cdi.group_id == NULL) {
+      oss_free_cubeb_device_info_strings(&cdi);
+      continue;
+    }
+
+    cdi.devid = devid;
+    cdi.vendor_name = NULL;
+    cdi.state = CUBEB_DEVICE_STATE_ENABLED;
+    cdi.preferred = CUBEB_DEVICE_PREF_NONE;
+    cdi.format = CUBEB_DEVICE_FMT_S16NE;
+    cdi.default_format = CUBEB_DEVICE_FMT_S16NE;
+    cdi.max_channels = ai.max_channels;
+    cdi.default_rate = OSS_PREFER_RATE;
+    cdi.max_rate = ai.max_rate;
+    cdi.min_rate = ai.min_rate;
+    cdi.latency_lo = 0;
+    cdi.latency_hi = 0;
+
+    devinfop[collection_cnt++] = cdi;
+  }
+
+  collection->count = collection_cnt;
+  collection->device = devinfop;
+
+  if (mixer_fd != -1)
+    close(mixer_fd);
+  return CUBEB_OK;
+
+fail:
+  if (mixer_fd != -1)
+    close(mixer_fd);
+  free(devinfop);
+  return CUBEB_ERROR;
+}
+
+#endif
+
+static int
+oss_device_collection_destroy(cubeb * context,
+                              cubeb_device_collection * collection)
+{
+  size_t i;
+  for (i = 0; i < collection->count; i++) {
+    oss_free_cubeb_device_info_strings(&collection->device[i]);
+  }
+  free(collection->device);
+  collection->device = NULL;
+  collection->count = 0;
+  return 0;
+}
+
+static unsigned int
+oss_chn_from_cubeb(cubeb_channel chn)
+{
+  switch (chn) {
+  case CHANNEL_FRONT_LEFT:
+    return CHID_L;
+  case CHANNEL_FRONT_RIGHT:
+    return CHID_R;
+  case CHANNEL_FRONT_CENTER:
+    return CHID_C;
+  case CHANNEL_LOW_FREQUENCY:
+    return CHID_LFE;
+  case CHANNEL_BACK_LEFT:
+    return CHID_LR;
+  case CHANNEL_BACK_RIGHT:
+    return CHID_RR;
+  case CHANNEL_SIDE_LEFT:
+    return CHID_LS;
+  case CHANNEL_SIDE_RIGHT:
+    return CHID_RS;
+  default:
+    return CHID_UNDEF;
+  }
+}
+
+static unsigned long long
+oss_cubeb_layout_to_chnorder(cubeb_channel_layout layout)
+{
+  unsigned int i, nchns = 0;
+  unsigned long long chnorder = 0;
+
+  for (i = 0; layout; i++, layout >>= 1) {
+    unsigned long long chid = oss_chn_from_cubeb((layout & 1) << i);
+    if (chid == CHID_UNDEF)
+      continue;
+
+    chnorder |= (chid & 0xf) << nchns * 4;
+    nchns++;
+  }
+
+  return chnorder;
+}
+
+static int
+oss_copy_params(int fd, cubeb_stream * stream, cubeb_stream_params * params,
+                struct stream_info * sinfo)
+{
+  unsigned long long chnorder;
+
+  sinfo->channels = params->channels;
+  sinfo->sample_rate = params->rate;
+  switch (params->format) {
+  case CUBEB_SAMPLE_S16LE:
+    sinfo->fmt = AFMT_S16_LE;
+    sinfo->precision = 16;
+    break;
+  case CUBEB_SAMPLE_S16BE:
+    sinfo->fmt = AFMT_S16_BE;
+    sinfo->precision = 16;
+    break;
+  case CUBEB_SAMPLE_FLOAT32NE:
+    sinfo->fmt = AFMT_S32_NE;
+    sinfo->precision = 32;
+    break;
+  default:
+    LOG("Unsupported format");
+    return CUBEB_ERROR_INVALID_FORMAT;
+  }
+  if (ioctl(fd, SNDCTL_DSP_CHANNELS, &sinfo->channels) == -1) {
+    return CUBEB_ERROR;
+  }
+  if (ioctl(fd, SNDCTL_DSP_SETFMT, &sinfo->fmt) == -1) {
+    return CUBEB_ERROR;
+  }
+  if (ioctl(fd, SNDCTL_DSP_SPEED, &sinfo->sample_rate) == -1) {
+    return CUBEB_ERROR;
+  }
+  /* Mono layout is an exception */
+  if (params->layout != CUBEB_LAYOUT_UNDEFINED &&
+      params->layout != CUBEB_LAYOUT_MONO) {
+    chnorder = oss_cubeb_layout_to_chnorder(params->layout);
+    if (ioctl(fd, SNDCTL_DSP_SET_CHNORDER, &chnorder) == -1)
+      LOG("Non-fatal error %d occured when setting channel order.", errno);
+  }
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_stop(cubeb_stream * s)
+{
+  pthread_mutex_lock(&s->mtx);
+  if (s->thread_created && s->running) {
+    s->running = false;
+    s->doorbell = false;
+    pthread_cond_wait(&s->stopped_cv, &s->mtx);
+  }
+  if (s->state != CUBEB_STATE_STOPPED) {
+    s->state = CUBEB_STATE_STOPPED;
+    pthread_mutex_unlock(&s->mtx);
+    s->state_cb(s, s->user_ptr, CUBEB_STATE_STOPPED);
+  } else {
+    pthread_mutex_unlock(&s->mtx);
+  }
+  return CUBEB_OK;
+}
+
+static void
+oss_stream_destroy(cubeb_stream * s)
+{
+  pthread_mutex_lock(&s->mtx);
+  if (s->thread_created) {
+    s->destroying = true;
+    s->doorbell = true;
+    pthread_cond_signal(&s->doorbell_cv);
+  }
+  pthread_mutex_unlock(&s->mtx);
+  pthread_join(s->thread, NULL);
+
+  pthread_cond_destroy(&s->doorbell_cv);
+  pthread_cond_destroy(&s->stopped_cv);
+  pthread_mutex_destroy(&s->mtx);
+  if (s->play.fd != -1) {
+    close(s->play.fd);
+  }
+  if (s->record.fd != -1) {
+    close(s->record.fd);
+  }
+  free(s->play.buf);
+  free(s->record.buf);
+  free(s);
+}
+
+static void
+oss_float_to_linear32(void * buf, unsigned sample_count, float vol)
+{
+  float * in = buf;
+  int32_t * out = buf;
+  int32_t * tail = out + sample_count;
+
+  while (out < tail) {
+    int64_t f = *(in++) * vol * 0x80000000LL;
+    if (f < -INT32_MAX)
+      f = -INT32_MAX;
+    else if (f > INT32_MAX)
+      f = INT32_MAX;
+    *(out++) = f;
+  }
+}
+
+static void
+oss_linear32_to_float(void * buf, unsigned sample_count)
+{
+  int32_t * in = buf;
+  float * out = buf;
+  float * tail = out + sample_count;
+
+  while (out < tail) {
+    *(out++) = (1.0 / 0x80000000LL) * *(in++);
+  }
+}
+
+static void
+oss_linear16_set_vol(int16_t * buf, unsigned sample_count, float vol)
+{
+  unsigned i;
+  int32_t multiplier = vol * 0x8000;
+
+  for (i = 0; i < sample_count; ++i) {
+    buf[i] = (buf[i] * multiplier) >> 15;
+  }
+}
+
+static int
+oss_get_rec_frames(cubeb_stream * s, unsigned int nframes)
+{
+  size_t rem = nframes * s->record.frame_size;
+  size_t read_ofs = 0;
+  while (rem > 0) {
+    ssize_t n;
+    if ((n = read(s->record.fd, (uint8_t *)s->record.buf + read_ofs, rem)) <
+        0) {
+      if (errno == EINTR)
+        continue;
+      return CUBEB_ERROR;
+    }
+    read_ofs += n;
+    rem -= n;
+  }
+  return 0;
+}
+
+static int
+oss_put_play_frames(cubeb_stream * s, unsigned int nframes)
+{
+  size_t rem = nframes * s->play.frame_size;
+  size_t write_ofs = 0;
+  while (rem > 0) {
+    ssize_t n;
+    if ((n = write(s->play.fd, (uint8_t *)s->play.buf + write_ofs, rem)) < 0) {
+      if (errno == EINTR)
+        continue;
+      return CUBEB_ERROR;
+    }
+    pthread_mutex_lock(&s->mtx);
+    s->frames_written += n / s->play.frame_size;
+    pthread_mutex_unlock(&s->mtx);
+    write_ofs += n;
+    rem -= n;
+  }
+  return 0;
+}
+
+static int
+oss_wait_fds_for_space(cubeb_stream * s, long * nfrp)
+{
+  audio_buf_info bi;
+  struct pollfd pfds[2];
+  long nfr, tnfr;
+  int i;
+
+  assert(s->play.fd != -1 || s->record.fd != -1);
+  pfds[0].events = POLLOUT | POLLHUP;
+  pfds[0].revents = 0;
+  pfds[0].fd = s->play.fd;
+  pfds[1].events = POLLIN | POLLHUP;
+  pfds[1].revents = 0;
+  pfds[1].fd = s->record.fd;
+
+retry:
+  nfr = LONG_MAX;
+
+  if (poll(pfds, 2, 1000) == -1) {
+    return CUBEB_ERROR;
+  }
+
+  for (i = 0; i < 2; i++) {
+    if (pfds[i].revents & POLLHUP) {
+      return CUBEB_ERROR;
+    }
+  }
+
+  if (s->play.fd != -1) {
+    if (ioctl(s->play.fd, SNDCTL_DSP_GETOSPACE, &bi) == -1) {
+      return CUBEB_STATE_ERROR;
+    }
+    tnfr = bi.bytes / s->play.frame_size;
+    if (tnfr <= 0) {
+      /* too little space - stop polling record, if any */
+      pfds[0].fd = s->play.fd;
+      pfds[1].fd = -1;
+      goto retry;
+    } else if (tnfr > (long)s->play.maxframes) {
+      /* too many frames available - limit */
+      tnfr = (long)s->play.maxframes;
+    }
+    if (nfr > tnfr) {
+      nfr = tnfr;
+    }
+  }
+  if (s->record.fd != -1) {
+    if (ioctl(s->record.fd, SNDCTL_DSP_GETISPACE, &bi) == -1) {
+      return CUBEB_STATE_ERROR;
+    }
+    tnfr = bi.bytes / s->record.frame_size;
+    if (tnfr <= 0) {
+      /* too little space - stop polling playback, if any */
+      pfds[0].fd = -1;
+      pfds[1].fd = s->record.fd;
+      goto retry;
+    } else if (tnfr > (long)s->record.maxframes) {
+      /* too many frames available - limit */
+      tnfr = (long)s->record.maxframes;
+    }
+    if (nfr > tnfr) {
+      nfr = tnfr;
+    }
+  }
+
+  *nfrp = nfr;
+  return 0;
+}
+
+/* 1 - Stopped by cubeb_stream_stop, otherwise 0 */
+static int
+oss_audio_loop(cubeb_stream * s, cubeb_state * new_state)
+{
+  cubeb_state state = CUBEB_STATE_STOPPED;
+  int trig = 0, drain = 0;
+  const bool play_on = s->play.fd != -1, record_on = s->record.fd != -1;
+  long nfr = 0;
+
+  if (record_on) {
+    if (ioctl(s->record.fd, SNDCTL_DSP_SETTRIGGER, &trig)) {
+      LOG("Error %d occured when setting trigger on record fd", errno);
+      state = CUBEB_STATE_ERROR;
+      goto breakdown;
+    }
+
+    trig |= PCM_ENABLE_INPUT;
+    memset(s->record.buf, 0, s->record.bufframes * s->record.frame_size);
+
+    if (ioctl(s->record.fd, SNDCTL_DSP_SETTRIGGER, &trig) == -1) {
+      LOG("Error %d occured when setting trigger on record fd", errno);
+      state = CUBEB_STATE_ERROR;
+      goto breakdown;
+    }
+  }
+
+  if (!play_on && !record_on) {
+    /*
+     * Stop here if the stream is not play & record stream,
+     * play-only stream or record-only stream
+     */
+
+    goto breakdown;
+  }
+
+  while (1) {
+    pthread_mutex_lock(&s->mtx);
+    if (!s->running || s->destroying) {
+      pthread_mutex_unlock(&s->mtx);
+      break;
+    }
+    pthread_mutex_unlock(&s->mtx);
+
+    long got = 0;
+    if (nfr > 0) {
+      if (record_on) {
+        if (oss_get_rec_frames(s, nfr) == CUBEB_ERROR) {
+          state = CUBEB_STATE_ERROR;
+          goto breakdown;
+        }
+        if (s->record.floating) {
+          oss_linear32_to_float(s->record.buf, s->record.info.channels * nfr);
+        }
+      }
+
+      got = s->data_cb(s, s->user_ptr, s->record.buf, s->play.buf, nfr);
+      if (got == CUBEB_ERROR) {
+        state = CUBEB_STATE_ERROR;
+        goto breakdown;
+      }
+      if (got < nfr) {
+        if (s->play.fd != -1) {
+          drain = 1;
+        } else {
+          /*
+           * This is a record-only stream and number of frames
+           * returned from data_cb() is smaller than number
+           * of frames required to read. Stop here.
+           */
+          state = CUBEB_STATE_STOPPED;
+          goto breakdown;
+        }
+      }
+
+      if (got > 0 && play_on) {
+        float vol;
+
+        pthread_mutex_lock(&s->mtx);
+        vol = s->volume;
+        pthread_mutex_unlock(&s->mtx);
+
+        if (s->play.floating) {
+          oss_float_to_linear32(s->play.buf, s->play.info.channels * got, vol);
+        } else {
+          oss_linear16_set_vol((int16_t *)s->play.buf,
+                               s->play.info.channels * got, vol);
+        }
+        if (oss_put_play_frames(s, got) == CUBEB_ERROR) {
+          state = CUBEB_STATE_ERROR;
+          goto breakdown;
+        }
+      }
+      if (drain) {
+        state = CUBEB_STATE_DRAINED;
+        goto breakdown;
+      }
+    }
+
+    if (oss_wait_fds_for_space(s, &nfr) != 0) {
+      state = CUBEB_STATE_ERROR;
+      goto breakdown;
+    }
+  }
+
+  return 1;
+
+breakdown:
+  pthread_mutex_lock(&s->mtx);
+  *new_state = s->state = state;
+  s->running = false;
+  pthread_mutex_unlock(&s->mtx);
+  return 0;
+}
+
+static void *
+oss_io_routine(void * arg)
+{
+  cubeb_stream * s = arg;
+  cubeb_state new_state;
+  int stopped;
+
+  CUBEB_REGISTER_THREAD("cubeb rendering thread");
+
+  do {
+    pthread_mutex_lock(&s->mtx);
+    if (s->destroying) {
+      pthread_mutex_unlock(&s->mtx);
+      break;
+    }
+    pthread_mutex_unlock(&s->mtx);
+
+    stopped = oss_audio_loop(s, &new_state);
+    if (s->record.fd != -1)
+      ioctl(s->record.fd, SNDCTL_DSP_HALT_INPUT, NULL);
+    if (!stopped)
+      s->state_cb(s, s->user_ptr, new_state);
+
+    pthread_mutex_lock(&s->mtx);
+    pthread_cond_signal(&s->stopped_cv);
+    if (s->destroying) {
+      pthread_mutex_unlock(&s->mtx);
+      break;
+    }
+    while (!s->doorbell) {
+      pthread_cond_wait(&s->doorbell_cv, &s->mtx);
+    }
+    s->doorbell = false;
+    pthread_mutex_unlock(&s->mtx);
+  } while (1);
+
+  pthread_mutex_lock(&s->mtx);
+  s->thread_created = false;
+  pthread_mutex_unlock(&s->mtx);
+
+  CUBEB_UNREGISTER_THREAD();
+
+  return NULL;
+}
+
+static inline int
+oss_calc_frag_shift(unsigned int frames, unsigned int frame_size)
+{
+  int n = 4;
+  int blksize = frames * frame_size;
+  while ((1 << n) < blksize) {
+    n++;
+  }
+  return n;
+}
+
+static inline int
+oss_get_frag_params(unsigned int shift)
+{
+  return (OSS_NFRAGS << 16) | shift;
+}
+
+static int
+oss_stream_init(cubeb * context, cubeb_stream ** stream,
+                char const * stream_name, cubeb_devid input_device,
+                cubeb_stream_params * input_stream_params,
+                cubeb_devid output_device,
+                cubeb_stream_params * output_stream_params,
+                unsigned int latency_frames, cubeb_data_callback data_callback,
+                cubeb_state_callback state_callback, void * user_ptr)
+{
+  int ret = CUBEB_OK;
+  cubeb_stream * s = NULL;
+  const char * defdsp;
+
+  if (!(defdsp = getenv(ENV_AUDIO_DEVICE)) || *defdsp == '\0')
+    defdsp = OSS_DEFAULT_DEVICE;
+
+  (void)stream_name;
+  if ((s = calloc(1, sizeof(cubeb_stream))) == NULL) {
+    ret = CUBEB_ERROR;
+    goto error;
+  }
+  s->state = CUBEB_STATE_STOPPED;
+  s->record.fd = s->play.fd = -1;
+  if (input_device != NULL) {
+    strlcpy(s->record.name, input_device, sizeof(s->record.name));
+  } else {
+    strlcpy(s->record.name, defdsp, sizeof(s->record.name));
+  }
+  if (output_device != NULL) {
+    strlcpy(s->play.name, output_device, sizeof(s->play.name));
+  } else {
+    strlcpy(s->play.name, defdsp, sizeof(s->play.name));
+  }
+  if (input_stream_params != NULL) {
+    unsigned int nb_channels;
+    uint32_t minframes;
+
+    if (input_stream_params->prefs & CUBEB_STREAM_PREF_LOOPBACK) {
+      LOG("Loopback not supported");
+      ret = CUBEB_ERROR_NOT_SUPPORTED;
+      goto error;
+    }
+    nb_channels = cubeb_channel_layout_nb_channels(input_stream_params->layout);
+    if (input_stream_params->layout != CUBEB_LAYOUT_UNDEFINED &&
+        nb_channels != input_stream_params->channels) {
+      LOG("input_stream_params->layout does not match "
+          "input_stream_params->channels");
+      ret = CUBEB_ERROR_INVALID_PARAMETER;
+      goto error;
+    }
+    if ((s->record.fd = open(s->record.name, O_RDONLY)) == -1) {
+      LOG("Audio device \"%s\" could not be opened as read-only",
+          s->record.name);
+      ret = CUBEB_ERROR_DEVICE_UNAVAILABLE;
+      goto error;
+    }
+    if ((ret = oss_copy_params(s->record.fd, s, input_stream_params,
+                               &s->record.info)) != CUBEB_OK) {
+      LOG("Setting record params failed");
+      goto error;
+    }
+    s->record.floating =
+        (input_stream_params->format == CUBEB_SAMPLE_FLOAT32NE);
+    s->record.frame_size =
+        s->record.info.channels * (s->record.info.precision / 8);
+    s->record.bufframes = latency_frames;
+
+    oss_get_min_latency(context, *input_stream_params, &minframes);
+    if (s->record.bufframes < minframes) {
+      s->record.bufframes = minframes;
+    }
+  }
+  if (output_stream_params != NULL) {
+    unsigned int nb_channels;
+    uint32_t minframes;
+
+    if (output_stream_params->prefs & CUBEB_STREAM_PREF_LOOPBACK) {
+      LOG("Loopback not supported");
+      ret = CUBEB_ERROR_NOT_SUPPORTED;
+      goto error;
+    }
+    nb_channels =
+        cubeb_channel_layout_nb_channels(output_stream_params->layout);
+    if (output_stream_params->layout != CUBEB_LAYOUT_UNDEFINED &&
+        nb_channels != output_stream_params->channels) {
+      LOG("output_stream_params->layout does not match "
+          "output_stream_params->channels");
+      ret = CUBEB_ERROR_INVALID_PARAMETER;
+      goto error;
+    }
+    if ((s->play.fd = open(s->play.name, O_WRONLY)) == -1) {
+      LOG("Audio device \"%s\" could not be opened as write-only",
+          s->play.name);
+      ret = CUBEB_ERROR_DEVICE_UNAVAILABLE;
+      goto error;
+    }
+    if ((ret = oss_copy_params(s->play.fd, s, output_stream_params,
+                               &s->play.info)) != CUBEB_OK) {
+      LOG("Setting play params failed");
+      goto error;
+    }
+    s->play.floating = (output_stream_params->format == CUBEB_SAMPLE_FLOAT32NE);
+    s->play.frame_size = s->play.info.channels * (s->play.info.precision / 8);
+    s->play.bufframes = latency_frames;
+
+    oss_get_min_latency(context, *output_stream_params, &minframes);
+    if (s->play.bufframes < minframes) {
+      s->play.bufframes = minframes;
+    }
+  }
+  if (s->play.fd != -1) {
+    int frag = oss_get_frag_params(
+        oss_calc_frag_shift(s->play.bufframes, s->play.frame_size));
+    if (ioctl(s->play.fd, SNDCTL_DSP_SETFRAGMENT, &frag))
+      LOG("Failed to set play fd with SNDCTL_DSP_SETFRAGMENT. frag: 0x%x",
+          frag);
+    audio_buf_info bi;
+    if (ioctl(s->play.fd, SNDCTL_DSP_GETOSPACE, &bi))
+      LOG("Failed to get play fd's buffer info.");
+    else {
+      s->play.bufframes = (bi.fragsize * bi.fragstotal) / s->play.frame_size;
+    }
+    int lw;
+
+    /*
+     * Force 32 ms service intervals at most, or when recording is
+     * active, use the recording service intervals as a reference.
+     */
+    s->play.maxframes = (32 * output_stream_params->rate) / 1000;
+    if (s->record.fd != -1 || s->play.maxframes >= s->play.bufframes) {
+      lw = s->play.frame_size; /* Feed data when possible. */
+      s->play.maxframes = s->play.bufframes;
+    } else {
+      lw = (s->play.bufframes - s->play.maxframes) * s->play.frame_size;
+    }
+    if (ioctl(s->play.fd, SNDCTL_DSP_LOW_WATER, &lw))
+      LOG("Audio device \"%s\" (play) could not set trigger threshold",
+          s->play.name);
+  }
+  if (s->record.fd != -1) {
+    int frag = oss_get_frag_params(
+        oss_calc_frag_shift(s->record.bufframes, s->record.frame_size));
+    if (ioctl(s->record.fd, SNDCTL_DSP_SETFRAGMENT, &frag))
+      LOG("Failed to set record fd with SNDCTL_DSP_SETFRAGMENT. frag: 0x%x",
+          frag);
+    audio_buf_info bi;
+    if (ioctl(s->record.fd, SNDCTL_DSP_GETISPACE, &bi))
+      LOG("Failed to get record fd's buffer info.");
+    else {
+      s->record.bufframes =
+          (bi.fragsize * bi.fragstotal) / s->record.frame_size;
+    }
+
+    s->record.maxframes = s->record.bufframes;
+    int lw = s->record.frame_size;
+    if (ioctl(s->record.fd, SNDCTL_DSP_LOW_WATER, &lw))
+      LOG("Audio device \"%s\" (record) could not set trigger threshold",
+          s->record.name);
+  }
+  s->context = context;
+  s->volume = 1.0;
+  s->state_cb = state_callback;
+  s->data_cb = data_callback;
+  s->user_ptr = user_ptr;
+
+  if (pthread_mutex_init(&s->mtx, NULL) != 0) {
+    LOG("Failed to create mutex");
+    goto error;
+  }
+  if (pthread_cond_init(&s->doorbell_cv, NULL) != 0) {
+    LOG("Failed to create cv");
+    goto error;
+  }
+  if (pthread_cond_init(&s->stopped_cv, NULL) != 0) {
+    LOG("Failed to create cv");
+    goto error;
+  }
+  s->doorbell = false;
+
+  if (s->play.fd != -1) {
+    if ((s->play.buf = calloc(s->play.bufframes, s->play.frame_size)) == NULL) {
+      ret = CUBEB_ERROR;
+      goto error;
+    }
+  }
+  if (s->record.fd != -1) {
+    if ((s->record.buf = calloc(s->record.bufframes, s->record.frame_size)) ==
+        NULL) {
+      ret = CUBEB_ERROR;
+      goto error;
+    }
+  }
+
+  *stream = s;
+  return CUBEB_OK;
+error:
+  if (s != NULL) {
+    oss_stream_destroy(s);
+  }
+  return ret;
+}
+
+static int
+oss_stream_thr_create(cubeb_stream * s)
+{
+  if (s->thread_created) {
+    s->doorbell = true;
+    pthread_cond_signal(&s->doorbell_cv);
+    return CUBEB_OK;
+  }
+
+  if (pthread_create(&s->thread, NULL, oss_io_routine, s) != 0) {
+    LOG("Couldn't create thread");
+    return CUBEB_ERROR;
+  }
+
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_start(cubeb_stream * s)
+{
+  s->state_cb(s, s->user_ptr, CUBEB_STATE_STARTED);
+  pthread_mutex_lock(&s->mtx);
+  /* Disallow starting an already started stream */
+  assert(!s->running && s->state != CUBEB_STATE_STARTED);
+  if (oss_stream_thr_create(s) != CUBEB_OK) {
+    pthread_mutex_unlock(&s->mtx);
+    s->state_cb(s, s->user_ptr, CUBEB_STATE_ERROR);
+    return CUBEB_ERROR;
+  }
+  s->state = CUBEB_STATE_STARTED;
+  s->thread_created = true;
+  s->running = true;
+  pthread_mutex_unlock(&s->mtx);
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_get_position(cubeb_stream * s, uint64_t * position)
+{
+  pthread_mutex_lock(&s->mtx);
+  *position = s->frames_written;
+  pthread_mutex_unlock(&s->mtx);
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_get_latency(cubeb_stream * s, uint32_t * latency)
+{
+  int delay;
+
+  if (ioctl(s->play.fd, SNDCTL_DSP_GETODELAY, &delay) == -1) {
+    return CUBEB_ERROR;
+  }
+
+  /* Return number of frames there */
+  *latency = delay / s->play.frame_size;
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_set_volume(cubeb_stream * stream, float volume)
+{
+  if (volume < 0.0)
+    volume = 0.0;
+  else if (volume > 1.0)
+    volume = 1.0;
+  pthread_mutex_lock(&stream->mtx);
+  stream->volume = volume;
+  pthread_mutex_unlock(&stream->mtx);
+  return CUBEB_OK;
+}
+
+static int
+oss_get_current_device(cubeb_stream * stream, cubeb_device ** const device)
+{
+  *device = calloc(1, sizeof(cubeb_device));
+  if (*device == NULL) {
+    return CUBEB_ERROR;
+  }
+  (*device)->input_name =
+      stream->record.fd != -1 ? strdup(stream->record.name) : NULL;
+  (*device)->output_name =
+      stream->play.fd != -1 ? strdup(stream->play.name) : NULL;
+  return CUBEB_OK;
+}
+
+static int
+oss_stream_device_destroy(cubeb_stream * stream, cubeb_device * device)
+{
+  (void)stream;
+  free(device->input_name);
+  free(device->output_name);
+  free(device);
+  return CUBEB_OK;
+}
+
+static struct cubeb_ops const oss_ops = {
+    .init = oss_init,
+    .get_backend_id = oss_get_backend_id,
+    .get_max_channel_count = oss_get_max_channel_count,
+    .get_min_latency = oss_get_min_latency,
+    .get_preferred_sample_rate = oss_get_preferred_sample_rate,
+    .enumerate_devices = oss_enumerate_devices,
+    .device_collection_destroy = oss_device_collection_destroy,
+    .destroy = oss_destroy,
+    .stream_init = oss_stream_init,
+    .stream_destroy = oss_stream_destroy,
+    .stream_start = oss_stream_start,
+    .stream_stop = oss_stream_stop,
+    .stream_get_position = oss_stream_get_position,
+    .stream_get_latency = oss_stream_get_latency,
+    .stream_get_input_latency = NULL,
+    .stream_set_volume = oss_stream_set_volume,
+    .stream_set_name = NULL,
+    .stream_get_current_device = oss_get_current_device,
+    .stream_device_destroy = oss_stream_device_destroy,
+    .stream_register_device_changed_callback = NULL,
+    .register_device_collection_changed = NULL};