]> code.delx.au - pulseaudio/blobdiff - src/modules/alsa/alsa-sink.c
devices: Set certain sink/source flags automatically.
[pulseaudio] / src / modules / alsa / alsa-sink.c
index c3694729a53a4ce4edad8a622a36db0413ff0a2f..0dd1840ac7b8c9c1e2bf7d1a3f5ea3871322c99e 100644 (file)
@@ -35,7 +35,7 @@
 #include <pulse/i18n.h>
 #include <pulse/rtclock.h>
 #include <pulse/timeval.h>
-#include <pulse/util.h>
+#include <pulse/volume.h>
 #include <pulse/xmalloc.h>
 
 #include <pulsecore/core.h>
@@ -49,7 +49,6 @@
 #include <pulsecore/log.h>
 #include <pulsecore/macro.h>
 #include <pulsecore/thread.h>
-#include <pulsecore/core-error.h>
 #include <pulsecore/thread-mq.h>
 #include <pulsecore/rtpoll.h>
 #include <pulsecore/time-smoother.h>
 /* #define DEBUG_TIMING */
 
 #define DEFAULT_DEVICE "default"
-#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)            /* 2s   -- Overall buffer size */
-#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)       /* 20ms -- Fill up when only this much is left in the buffer */
-#define TSCHED_WATERMARK_STEP_USEC (10*PA_USEC_PER_MSEC)          /* 10ms -- On underrun, increase watermark by this */
-#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC)               /* 10ms -- Sleep at least 10ms on each iteration */
-#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC)               /* 4ms  -- Wakeup at least this long before the buffer runs empty*/
 
-#define SMOOTHER_MIN_INTERVAL (2*PA_USEC_PER_MSEC)                /* 2ms -- min smoother update interval */
-#define SMOOTHER_MAX_INTERVAL (200*PA_USEC_PER_MSEC)              /* 200ms -- max smoother update inteval */
+#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)             /* 2s    -- Overall buffer size */
+#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)        /* 20ms  -- Fill up when only this much is left in the buffer */
+
+#define TSCHED_WATERMARK_INC_STEP_USEC (10*PA_USEC_PER_MSEC)       /* 10ms  -- On underrun, increase watermark by this */
+#define TSCHED_WATERMARK_DEC_STEP_USEC (5*PA_USEC_PER_MSEC)        /* 5ms   -- When everything's great, decrease watermark by this */
+#define TSCHED_WATERMARK_VERIFY_AFTER_USEC (20*PA_USEC_PER_SEC)    /* 20s   -- How long after a drop out recheck if things are good now */
+#define TSCHED_WATERMARK_INC_THRESHOLD_USEC (0*PA_USEC_PER_MSEC)   /* 0ms   -- If the buffer level ever below this theshold, increase the watermark */
+#define TSCHED_WATERMARK_DEC_THRESHOLD_USEC (100*PA_USEC_PER_MSEC) /* 100ms -- If the buffer level didn't drop below this theshold in the verification time, decrease the watermark */
+
+/* Note that TSCHED_WATERMARK_INC_THRESHOLD_USEC == 0 means tht we
+ * will increase the watermark only if we hit a real underrun. */
+
+#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC)                /* 10ms  -- Sleep at least 10ms on each iteration */
+#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC)                /* 4ms   -- Wakeup at least this long before the buffer runs empty*/
+
+#define SMOOTHER_WINDOW_USEC  (10*PA_USEC_PER_SEC)                 /* 10s   -- smoother windows size */
+#define SMOOTHER_ADJUST_USEC  (1*PA_USEC_PER_SEC)                  /* 1s    -- smoother adjust time */
+
+#define SMOOTHER_MIN_INTERVAL (2*PA_USEC_PER_MSEC)                 /* 2ms   -- min smoother update interval */
+#define SMOOTHER_MAX_INTERVAL (200*PA_USEC_PER_MSEC)               /* 200ms -- max smoother update interval */
 
 #define VOLUME_ACCURACY (PA_VOLUME_NORM/100)  /* don't require volume adjustments to be perfectly correct. don't necessarily extend granularity in software unless the differences get greater than this level */
 
+#define DEFAULT_REWIND_SAFEGUARD_BYTES (256U) /* 1.33ms @48kHz, we'll never rewind less than this */
+#define DEFAULT_REWIND_SAFEGUARD_USEC (1330) /* 1.33ms, depending on channels/rate/sample we may rewind more than 256 above */
+
 struct userdata {
     pa_core *core;
     pa_module *module;
@@ -85,12 +100,15 @@ struct userdata {
     snd_pcm_t *pcm_handle;
 
     pa_alsa_fdlist *mixer_fdl;
+    pa_alsa_mixer_pdata *mixer_pd;
     snd_mixer_t *mixer_handle;
     pa_alsa_path_set *mixer_path_set;
     pa_alsa_path *mixer_path;
 
     pa_cvolume hardware_volume;
 
+    uint32_t old_rate;
+
     size_t
         frame_size,
         fragment_size,
@@ -99,9 +117,14 @@ struct userdata {
         hwbuf_unused,
         min_sleep,
         min_wakeup,
-        watermark_step;
+        watermark_inc_step,
+        watermark_dec_step,
+        watermark_inc_threshold,
+        watermark_dec_threshold,
+        rewind_safeguard;
+
+    pa_usec_t watermark_dec_not_before;
 
-    unsigned nfragments;
     pa_memchunk memchunk;
 
     char *device_name;  /* name of the PCM device */
@@ -232,6 +255,7 @@ static int reserve_monitor_init(struct userdata *u, const char *dname) {
     if (!(rname = pa_alsa_get_reserve_name(dname)))
         return 0;
 
+    /* We are resuming, try to lock the device */
     u->monitor = pa_reserve_monitor_wrapper_get(u->core, rname);
     pa_xfree(rname);
 
@@ -248,6 +272,7 @@ static void fix_min_sleep_wakeup(struct userdata *u) {
     size_t max_use, max_use_2;
 
     pa_assert(u);
+    pa_assert(u->use_tsched);
 
     max_use = u->hwbuf_size - u->hwbuf_unused;
     max_use_2 = pa_frame_align(max_use/2, &u->sink->sample_spec);
@@ -262,6 +287,7 @@ static void fix_min_sleep_wakeup(struct userdata *u) {
 static void fix_tsched_watermark(struct userdata *u) {
     size_t max_use;
     pa_assert(u);
+    pa_assert(u->use_tsched);
 
     max_use = u->hwbuf_size - u->hwbuf_unused;
 
@@ -272,7 +298,7 @@ static void fix_tsched_watermark(struct userdata *u) {
         u->tsched_watermark = u->min_wakeup;
 }
 
-static void adjust_after_underrun(struct userdata *u) {
+static void increase_watermark(struct userdata *u) {
     size_t old_watermark;
     pa_usec_t old_min_latency, new_min_latency;
 
@@ -281,31 +307,64 @@ static void adjust_after_underrun(struct userdata *u) {
 
     /* First, just try to increase the watermark */
     old_watermark = u->tsched_watermark;
-    u->tsched_watermark = PA_MIN(u->tsched_watermark * 2, u->tsched_watermark + u->watermark_step);
+    u->tsched_watermark = PA_MIN(u->tsched_watermark * 2, u->tsched_watermark + u->watermark_inc_step);
     fix_tsched_watermark(u);
 
     if (old_watermark != u->tsched_watermark) {
-        pa_log_notice("Increasing wakeup watermark to %0.2f ms",
-                      (double) pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
+        pa_log_info("Increasing wakeup watermark to %0.2f ms",
+                    (double) pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
         return;
     }
 
     /* Hmm, we cannot increase the watermark any further, hence let's raise the latency */
     old_min_latency = u->sink->thread_info.min_latency;
-    new_min_latency = PA_MIN(old_min_latency * 2, old_min_latency + TSCHED_WATERMARK_STEP_USEC);
+    new_min_latency = PA_MIN(old_min_latency * 2, old_min_latency + TSCHED_WATERMARK_INC_STEP_USEC);
     new_min_latency = PA_MIN(new_min_latency, u->sink->thread_info.max_latency);
 
     if (old_min_latency != new_min_latency) {
-        pa_log_notice("Increasing minimal latency to %0.2f ms",
-                      (double) new_min_latency / PA_USEC_PER_MSEC);
+        pa_log_info("Increasing minimal latency to %0.2f ms",
+                    (double) new_min_latency / PA_USEC_PER_MSEC);
 
         pa_sink_set_latency_range_within_thread(u->sink, new_min_latency, u->sink->thread_info.max_latency);
-        return;
     }
 
     /* When we reach this we're officialy fucked! */
 }
 
+static void decrease_watermark(struct userdata *u) {
+    size_t old_watermark;
+    pa_usec_t now;
+
+    pa_assert(u);
+    pa_assert(u->use_tsched);
+
+    now = pa_rtclock_now();
+
+    if (u->watermark_dec_not_before <= 0)
+        goto restart;
+
+    if (u->watermark_dec_not_before > now)
+        return;
+
+    old_watermark = u->tsched_watermark;
+
+    if (u->tsched_watermark < u->watermark_dec_step)
+        u->tsched_watermark = u->tsched_watermark / 2;
+    else
+        u->tsched_watermark = PA_MAX(u->tsched_watermark / 2, u->tsched_watermark - u->watermark_dec_step);
+
+    fix_tsched_watermark(u);
+
+    if (old_watermark != u->tsched_watermark)
+        pa_log_info("Decreasing wakeup watermark to %0.2f ms",
+                    (double) pa_bytes_to_usec(u->tsched_watermark, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
+
+    /* We don't change the latency range*/
+
+restart:
+    u->watermark_dec_not_before = now + TSCHED_WATERMARK_VERIFY_AFTER_USEC;
+}
+
 static void hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_usec_t*process_usec) {
     pa_usec_t usec, wm;
 
@@ -313,6 +372,7 @@ static void hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_usec_t*p
     pa_assert(process_usec);
 
     pa_assert(u);
+    pa_assert(u->use_tsched);
 
     usec = pa_sink_get_requested_latency_within_thread(u->sink);
 
@@ -360,43 +420,66 @@ static int try_recover(struct userdata *u, const char *call, int err) {
     return 0;
 }
 
-static size_t check_left_to_play(struct userdata *u, size_t n_bytes) {
+static size_t check_left_to_play(struct userdata *u, size_t n_bytes, pa_bool_t on_timeout) {
     size_t left_to_play;
+    pa_bool_t underrun = FALSE;
 
     /* We use <= instead of < for this check here because an underrun
      * only happens after the last sample was processed, not already when
      * it is removed from the buffer. This is particularly important
      * when block transfer is used. */
 
-    if (n_bytes <= u->hwbuf_size) {
+    if (n_bytes <= u->hwbuf_size)
         left_to_play = u->hwbuf_size - n_bytes;
+    else {
+
+        /* We got a dropout. What a mess! */
+        left_to_play = 0;
+        underrun = TRUE;
 
 #ifdef DEBUG_TIMING
-        pa_log_debug("%0.2f ms left to play", (double) pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
+        PA_DEBUG_TRAP;
 #endif
 
-    } else {
-        left_to_play = 0;
+        if (!u->first && !u->after_rewind)
+            if (pa_log_ratelimit(PA_LOG_INFO))
+                pa_log_info("Underrun!");
+    }
 
 #ifdef DEBUG_TIMING
-        PA_DEBUG_TRAP;
+    pa_log_debug("%0.2f ms left to play; inc threshold = %0.2f ms; dec threshold = %0.2f ms",
+                 (double) pa_bytes_to_usec(left_to_play, &u->sink->sample_spec) / PA_USEC_PER_MSEC,
+                 (double) pa_bytes_to_usec(u->watermark_inc_threshold, &u->sink->sample_spec) / PA_USEC_PER_MSEC,
+                 (double) pa_bytes_to_usec(u->watermark_dec_threshold, &u->sink->sample_spec) / PA_USEC_PER_MSEC);
 #endif
 
+    if (u->use_tsched) {
+        pa_bool_t reset_not_before = TRUE;
+
         if (!u->first && !u->after_rewind) {
+            if (underrun || left_to_play < u->watermark_inc_threshold)
+                increase_watermark(u);
+            else if (left_to_play > u->watermark_dec_threshold) {
+                reset_not_before = FALSE;
 
-            if (pa_log_ratelimit())
-                pa_log_info("Underrun!");
+                /* We decrease the watermark only if have actually
+                 * been woken up by a timeout. If something else woke
+                 * us up it's too easy to fulfill the deadlines... */
 
-            if (u->use_tsched)
-                adjust_after_underrun(u);
+                if (on_timeout)
+                    decrease_watermark(u);
+            }
         }
+
+        if (reset_not_before)
+            u->watermark_dec_not_before = 0;
     }
 
     return left_to_play;
 }
 
-static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
-    pa_bool_t work_done = TRUE;
+static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled, pa_bool_t on_timeout) {
+    pa_bool_t work_done = FALSE;
     pa_usec_t max_sleep_usec = 0, process_usec = 0;
     size_t left_to_play;
     unsigned j = 0;
@@ -430,7 +513,8 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         pa_log_debug("avail: %lu", (unsigned long) n_bytes);
 #endif
 
-        left_to_play = check_left_to_play(u, n_bytes);
+        left_to_play = check_left_to_play(u, n_bytes, on_timeout);
+        on_timeout = FALSE;
 
         if (u->use_tsched)
 
@@ -533,6 +617,9 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
 
             if (PA_UNLIKELY((sframes = snd_pcm_mmap_commit(u->pcm_handle, offset, frames)) < 0)) {
 
+                if (!after_avail && (int) sframes == -EAGAIN)
+                    break;
+
                 if ((r = try_recover(u, "snd_pcm_mmap_commit", (int) sframes)) == 0)
                     continue;
 
@@ -555,17 +642,20 @@ static int mmap_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    } else
         *sleep_usec = 0;
 
     return work_done ? 1 : 0;
 }
 
-static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled, pa_bool_t on_timeout) {
     pa_bool_t work_done = FALSE;
     pa_usec_t max_sleep_usec = 0, process_usec = 0;
     size_t left_to_play;
@@ -581,6 +671,7 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         snd_pcm_sframes_t n;
         size_t n_bytes;
         int r;
+        pa_bool_t after_avail = TRUE;
 
         if (PA_UNLIKELY((n = pa_alsa_safe_avail(u->pcm_handle, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
 
@@ -591,7 +682,8 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         }
 
         n_bytes = (size_t) n * u->frame_size;
-        left_to_play = check_left_to_play(u, n_bytes);
+        left_to_play = check_left_to_play(u, n_bytes, on_timeout);
+        on_timeout = FALSE;
 
         if (u->use_tsched)
 
@@ -634,7 +726,6 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         for (;;) {
             snd_pcm_sframes_t frames;
             void *p;
-            pa_bool_t after_avail = TRUE;
 
 /*         pa_log_debug("%lu frames to write", (unsigned long) frames); */
 
@@ -691,11 +782,14 @@ static int unix_write(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polle
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_play, &u->sink->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    } else
         *sleep_usec = 0;
 
     return work_done ? 1 : 0;
@@ -715,7 +809,7 @@ static void update_smoother(struct userdata *u) {
 
     /* Let's update the time smoother */
 
-    if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->sink->sample_spec)) < 0)) {
+    if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->sink->sample_spec, FALSE)) < 0)) {
         pa_log_warn("Failed to query DSP status data: %s", pa_alsa_strerror(err));
         return;
     }
@@ -733,10 +827,9 @@ static void update_smoother(struct userdata *u) {
         now1 = pa_rtclock_now();
 
     /* check if the time since the last update is bigger than the interval */
-    if (u->last_smoother_update > 0) {
+    if (u->last_smoother_update > 0)
         if (u->last_smoother_update + u->smoother_interval > now1)
             return;
-    }
 
     position = (int64_t) u->write_count - ((int64_t) delay * (int64_t) u->frame_size);
 
@@ -745,11 +838,11 @@ static void update_smoother(struct userdata *u) {
 
     now2 = pa_bytes_to_usec((uint64_t) position, &u->sink->sample_spec);
 
+    pa_smoother_put(u->smoother, now1, now2);
+
     u->last_smoother_update = now1;
     /* exponentially increase the update interval up to the MAX limit */
     u->smoother_interval = PA_MIN (u->smoother_interval * 2, SMOOTHER_MAX_INTERVAL);
-
-    pa_smoother_put(u->smoother, now1, now2);
 }
 
 static pa_usec_t sink_get_latency(struct userdata *u) {
@@ -802,6 +895,14 @@ static int suspend(struct userdata *u) {
         u->alsa_rtpoll_item = NULL;
     }
 
+    /* We reset max_rewind/max_request here to make sure that while we
+     * are suspended the old max_request/max_rewind values set before
+     * the suspend can influence the per-stream buffer of newly
+     * created streams, without their requirements having any
+     * influence on them. */
+    pa_sink_set_max_rewind_within_thread(u->sink, 0);
+    pa_sink_set_max_request_within_thread(u->sink, 0);
+
     pa_log_info("Device suspended...");
 
     return 0;
@@ -853,12 +954,18 @@ static int update_sw_params(struct userdata *u) {
 
     pa_log_debug("setting avail_min=%lu", (unsigned long) avail_min);
 
-    if ((err = pa_alsa_set_sw_params(u->pcm_handle, avail_min)) < 0) {
+    if ((err = pa_alsa_set_sw_params(u->pcm_handle, avail_min, !u->use_tsched)) < 0) {
         pa_log("Failed to set software parameters: %s", pa_alsa_strerror(err));
         return err;
     }
 
     pa_sink_set_max_request_within_thread(u->sink, u->hwbuf_size - u->hwbuf_unused);
+     if (pa_alsa_pcm_is_hw(u->pcm_handle))
+         pa_sink_set_max_rewind_within_thread(u->sink, u->hwbuf_size);
+    else {
+        pa_log_info("Disabling rewind_within_thread for device %s", u->device_name);
+        pa_sink_set_max_rewind_within_thread(u->sink, 0);
+    }
 
     return 0;
 }
@@ -868,8 +975,7 @@ static int unsuspend(struct userdata *u) {
     pa_sample_spec ss;
     int err;
     pa_bool_t b, d;
-    unsigned nfrags;
-    snd_pcm_uframes_t period_size;
+    snd_pcm_uframes_t period_size, buffer_size;
 
     pa_assert(u);
     pa_assert(!u->pcm_handle);
@@ -877,7 +983,7 @@ static int unsuspend(struct userdata *u) {
     pa_log_info("Trying resume...");
 
     if ((err = snd_pcm_open(&u->pcm_handle, u->device_name, SND_PCM_STREAM_PLAYBACK,
-                            /*SND_PCM_NONBLOCK|*/
+                            SND_PCM_NONBLOCK|
                             SND_PCM_NO_AUTO_RESAMPLE|
                             SND_PCM_NO_AUTO_CHANNELS|
                             SND_PCM_NO_AUTO_FORMAT)) < 0) {
@@ -886,12 +992,12 @@ static int unsuspend(struct userdata *u) {
     }
 
     ss = u->sink->sample_spec;
-    nfrags = u->nfragments;
     period_size = u->fragment_size / u->frame_size;
+    buffer_size = u->hwbuf_size / u->frame_size;
     b = u->use_mmap;
     d = u->use_tsched;
 
-    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, u->hwbuf_size / u->frame_size, &b, &d, TRUE)) < 0) {
+    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &period_size, &buffer_size, 0, &b, &d, TRUE)) < 0) {
         pa_log("Failed to set hardware parameters: %s", pa_alsa_strerror(err));
         goto fail;
     }
@@ -906,10 +1012,11 @@ static int unsuspend(struct userdata *u) {
         goto fail;
     }
 
-    if (nfrags != u->nfragments || period_size*u->frame_size != u->fragment_size) {
-        pa_log_warn("Resume failed, couldn't restore original fragment settings. (Old: %lu*%lu, New %lu*%lu)",
-                    (unsigned long) u->nfragments, (unsigned long) u->fragment_size,
-                    (unsigned long) nfrags, period_size * u->frame_size);
+    if (period_size*u->frame_size != u->fragment_size ||
+        buffer_size*u->frame_size != u->hwbuf_size) {
+        pa_log_warn("Resume failed, couldn't restore original fragment settings. (Old: %lu/%lu, New %lu/%lu)",
+                    (unsigned long) u->hwbuf_size, (unsigned long) u->fragment_size,
+                    (unsigned long) (buffer_size*u->frame_size), (unsigned long) (period_size*u->frame_size));
         goto fail;
     }
 
@@ -927,7 +1034,6 @@ static int unsuspend(struct userdata *u) {
     u->first = TRUE;
     u->since_start = 0;
 
-
     pa_log_info("Resumed successfully...");
 
     return 0;
@@ -938,7 +1044,7 @@ fail:
         u->pcm_handle = NULL;
     }
 
-    return -1;
+    return -PA_ERR_IO;
 }
 
 /* Called from IO context */
@@ -947,6 +1053,56 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 
     switch (code) {
 
+        case PA_SINK_MESSAGE_FINISH_MOVE:
+        case PA_SINK_MESSAGE_ADD_INPUT: {
+            pa_sink_input *i = PA_SINK_INPUT(data);
+            int r = 0;
+
+            if (PA_LIKELY(!pa_sink_input_is_passthrough(i)))
+                break;
+
+            u->old_rate = u->sink->sample_spec.rate;
+
+            /* Passthrough format, see if we need to reset sink sample rate */
+            if (u->sink->sample_spec.rate == i->thread_info.sample_spec.rate)
+                break;
+
+            /* .. we do */
+            if ((r = suspend(u)) < 0)
+                return r;
+
+            u->sink->sample_spec.rate = i->thread_info.sample_spec.rate;
+
+            if ((r = unsuspend(u)) < 0)
+                return r;
+
+            break;
+        }
+
+        case PA_SINK_MESSAGE_START_MOVE:
+        case PA_SINK_MESSAGE_REMOVE_INPUT: {
+            pa_sink_input *i = PA_SINK_INPUT(data);
+            int r = 0;
+
+            if (PA_LIKELY(!pa_sink_input_is_passthrough(i)))
+                break;
+
+            /* Passthrough format, see if we need to reset sink sample rate */
+            if (u->sink->sample_spec.rate == u->old_rate)
+                break;
+
+            /* .. we do */
+            if ((r = suspend(u)) < 0)
+                return r;
+
+            u->sink->sample_spec.rate = u->old_rate;
+
+            if ((r = unsuspend(u)) < 0)
+                return r;
+
+            break;
+        }
+
         case PA_SINK_MESSAGE_GET_LATENCY: {
             pa_usec_t r = 0;
 
@@ -962,28 +1118,33 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
 
             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 
-                case PA_SINK_SUSPENDED:
+                case PA_SINK_SUSPENDED: {
+                    int r;
+
                     pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
 
-                    if (suspend(u) < 0)
-                        return -1;
+                    if ((r = suspend(u)) < 0)
+                        return r;
 
                     break;
+                }
 
                 case PA_SINK_IDLE:
-                case PA_SINK_RUNNING:
+                case PA_SINK_RUNNING: {
+                    int r;
 
                     if (u->sink->thread_info.state == PA_SINK_INIT) {
                         if (build_pollfd(u) < 0)
-                            return -1;
+                            return -PA_ERR_IO;
                     }
 
                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
-                        if (unsuspend(u) < 0)
-                            return -1;
+                        if ((r = unsuspend(u)) < 0)
+                            return r;
                     }
 
                     break;
+                }
 
                 case PA_SINK_UNLINKED:
                 case PA_SINK_INIT:
@@ -1011,12 +1172,12 @@ static int sink_set_state_cb(pa_sink *s, pa_sink_state_t new_state) {
         reserve_done(u);
     else if (old_state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(new_state))
         if (reserve_init(u, u->device_name) < 0)
-            return -1;
+            return -PA_ERR_BUSY;
 
     return 0;
 }
 
-static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
+static int ctl_mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
     struct userdata *u = snd_mixer_elem_get_callback_private(elem);
 
     pa_assert(u);
@@ -1025,6 +1186,9 @@ static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
     if (mask == SND_CTL_EVENT_MASK_REMOVE)
         return 0;
 
+    if (u->sink->suspend_cause & PA_SUSPEND_SESSION)
+        return 0;
+
     if (mask & SND_CTL_EVENT_MASK_VALUE) {
         pa_sink_get_volume(u->sink, TRUE);
         pa_sink_get_mute(u->sink, TRUE);
@@ -1033,10 +1197,28 @@ static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
     return 0;
 }
 
+static int io_mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
+    struct userdata *u = snd_mixer_elem_get_callback_private(elem);
+
+    pa_assert(u);
+    pa_assert(u->mixer_handle);
+
+    if (mask == SND_CTL_EVENT_MASK_REMOVE)
+        return 0;
+
+    if (u->sink->suspend_cause & PA_SUSPEND_SESSION)
+        return 0;
+
+    if (mask & SND_CTL_EVENT_MASK_VALUE)
+        pa_sink_update_volume_and_mute(u->sink);
+
+    return 0;
+}
+
 static void sink_get_volume_cb(pa_sink *s) {
     struct userdata *u = s->userdata;
     pa_cvolume r;
-    char t[PA_CVOLUME_SNPRINT_MAX];
+    char vol_str_pcnt[PA_CVOLUME_SNPRINT_MAX];
 
     pa_assert(u);
     pa_assert(u->mixer_path);
@@ -1048,7 +1230,13 @@ static void sink_get_volume_cb(pa_sink *s) {
     /* Shift down by the base volume, so that 0dB becomes maximum volume */
     pa_sw_cvolume_multiply_scalar(&r, &r, s->base_volume);
 
-    pa_log_debug("Read hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+    pa_log_debug("Read hardware volume: %s", pa_cvolume_snprint(vol_str_pcnt, sizeof(vol_str_pcnt), &r));
+
+    if (u->mixer_path->has_dB) {
+        char vol_str_db[PA_SW_CVOLUME_SNPRINT_DB_MAX];
+
+        pa_log_debug("               in dB: %s", pa_sw_cvolume_snprint_dB(vol_str_db, sizeof(vol_str_db), &r));
+    }
 
     if (pa_cvolume_equal(&u->hardware_volume, &r))
         return;
@@ -1063,7 +1251,8 @@ static void sink_get_volume_cb(pa_sink *s) {
 static void sink_set_volume_cb(pa_sink *s) {
     struct userdata *u = s->userdata;
     pa_cvolume r;
-    char t[PA_CVOLUME_SNPRINT_MAX];
+    char vol_str_pcnt[PA_CVOLUME_SNPRINT_MAX];
+    pa_bool_t sync_volume = !!(s->flags & PA_SINK_SYNC_VOLUME);
 
     pa_assert(u);
     pa_assert(u->mixer_path);
@@ -1072,7 +1261,7 @@ static void sink_set_volume_cb(pa_sink *s) {
     /* Shift up by the base volume */
     pa_sw_cvolume_divide_scalar(&r, &s->real_volume, s->base_volume);
 
-    if (pa_alsa_path_set_volume(u->mixer_path, u->mixer_handle, &s->channel_map, &r) < 0)
+    if (pa_alsa_path_set_volume(u->mixer_path, u->mixer_handle, &s->channel_map, &r, sync_volume, !sync_volume) < 0)
         return;
 
     /* Shift down by the base volume, so that 0dB becomes maximum volume */
@@ -1083,6 +1272,7 @@ static void sink_set_volume_cb(pa_sink *s) {
     if (u->mixer_path->has_dB) {
         pa_cvolume new_soft_volume;
         pa_bool_t accurate_enough;
+        char vol_str_db[PA_SW_CVOLUME_SNPRINT_DB_MAX];
 
         /* Match exactly what the user requested by software */
         pa_sw_cvolume_divide(&new_soft_volume, &s->real_volume, &u->hardware_volume);
@@ -1094,16 +1284,20 @@ static void sink_set_volume_cb(pa_sink *s) {
             (pa_cvolume_min(&new_soft_volume) >= (PA_VOLUME_NORM - VOLUME_ACCURACY)) &&
             (pa_cvolume_max(&new_soft_volume) <= (PA_VOLUME_NORM + VOLUME_ACCURACY));
 
-        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->real_volume));
-        pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &u->hardware_volume));
-        pa_log_debug("Calculated software volume: %s (accurate-enough=%s)", pa_cvolume_snprint(t, sizeof(t), &new_soft_volume),
+        pa_log_debug("Requested volume: %s", pa_cvolume_snprint(vol_str_pcnt, sizeof(vol_str_pcnt), &s->real_volume));
+        pa_log_debug("           in dB: %s", pa_sw_cvolume_snprint_dB(vol_str_db, sizeof(vol_str_db), &s->real_volume));
+        pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(vol_str_pcnt, sizeof(vol_str_pcnt), &u->hardware_volume));
+        pa_log_debug("              in dB: %s", pa_sw_cvolume_snprint_dB(vol_str_db, sizeof(vol_str_db), &u->hardware_volume));
+        pa_log_debug("Calculated software volume: %s (accurate-enough=%s)",
+                     pa_cvolume_snprint(vol_str_pcnt, sizeof(vol_str_pcnt), &new_soft_volume),
                      pa_yes_no(accurate_enough));
+        pa_log_debug("                     in dB: %s", pa_sw_cvolume_snprint_dB(vol_str_db, sizeof(vol_str_db), &new_soft_volume));
 
         if (!accurate_enough)
             s->soft_volume = new_soft_volume;
 
     } else {
-        pa_log_debug("Wrote hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &r));
+        pa_log_debug("Wrote hardware volume: %s", pa_cvolume_snprint(vol_str_pcnt, sizeof(vol_str_pcnt), &r));
 
         /* We can't match exactly what the user requested, hence let's
          * at least tell the user about it */
@@ -1112,6 +1306,48 @@ static void sink_set_volume_cb(pa_sink *s) {
     }
 }
 
+static void sink_write_volume_cb(pa_sink *s) {
+    struct userdata *u = s->userdata;
+    pa_cvolume hw_vol = s->thread_info.current_hw_volume;
+
+    pa_assert(u);
+    pa_assert(u->mixer_path);
+    pa_assert(u->mixer_handle);
+    pa_assert(s->flags & PA_SINK_SYNC_VOLUME);
+
+    /* Shift up by the base volume */
+    pa_sw_cvolume_divide_scalar(&hw_vol, &hw_vol, s->base_volume);
+
+    if (pa_alsa_path_set_volume(u->mixer_path, u->mixer_handle, &s->channel_map, &hw_vol, TRUE, TRUE) < 0)
+        pa_log_error("Writing HW volume failed");
+    else {
+        pa_cvolume tmp_vol;
+        pa_bool_t accurate_enough;
+
+        /* Shift down by the base volume, so that 0dB becomes maximum volume */
+        pa_sw_cvolume_multiply_scalar(&hw_vol, &hw_vol, s->base_volume);
+
+        pa_sw_cvolume_divide(&tmp_vol, &hw_vol, &s->thread_info.current_hw_volume);
+        accurate_enough =
+            (pa_cvolume_min(&tmp_vol) >= (PA_VOLUME_NORM - VOLUME_ACCURACY)) &&
+            (pa_cvolume_max(&tmp_vol) <= (PA_VOLUME_NORM + VOLUME_ACCURACY));
+
+        if (!accurate_enough) {
+            union {
+                char db[2][PA_SW_CVOLUME_SNPRINT_DB_MAX];
+                char pcnt[2][PA_CVOLUME_SNPRINT_MAX];
+            } vol;
+
+            pa_log_debug("Written HW volume did not match with the request: %s (request) != %s",
+                         pa_cvolume_snprint(vol.pcnt[0], sizeof(vol.pcnt[0]), &s->thread_info.current_hw_volume),
+                         pa_cvolume_snprint(vol.pcnt[1], sizeof(vol.pcnt[1]), &hw_vol));
+            pa_log_debug("                                           in dB: %s (request) != %s",
+                         pa_sw_cvolume_snprint_dB(vol.db[0], sizeof(vol.db[0]), &s->thread_info.current_hw_volume),
+                         pa_sw_cvolume_snprint_dB(vol.db[1], sizeof(vol.db[1]), &hw_vol));
+        }
+    }
+}
+
 static void sink_get_mute_cb(pa_sink *s) {
     struct userdata *u = s->userdata;
     pa_bool_t b;
@@ -1153,10 +1389,7 @@ static int sink_set_port_cb(pa_sink *s, pa_device_port *p) {
         s->base_volume = pa_sw_volume_from_dB(-u->mixer_path->max_dB);
         s->n_volume_steps = PA_VOLUME_NORM+1;
 
-        if (u->mixer_path->max_dB > 0.0)
-            pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(s->base_volume));
-        else
-            pa_log_info("No particular base volume set, fixing to 0 dB");
+        pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(s->base_volume));
     } else {
         s->base_volume = PA_VOLUME_NORM;
         s->n_volume_steps = u->mixer_path->max_volume - u->mixer_path->min_volume + 1;
@@ -1177,6 +1410,9 @@ static void sink_update_requested_latency_cb(pa_sink *s) {
     struct userdata *u = s->userdata;
     size_t before;
     pa_assert(u);
+    pa_assert(u->use_tsched); /* only when timer scheduling is used
+                               * we can dynamically adjust the
+                               * latency */
 
     if (!u->pcm_handle)
         return;
@@ -1211,7 +1447,10 @@ static int process_rewind(struct userdata *u) {
         return -1;
     }
 
-    unused_nbytes = u->tsched_watermark + (size_t) unused * u->frame_size;
+    unused_nbytes = (size_t) unused * u->frame_size;
+
+    /* make sure rewind doesn't go too far, can cause issues with DMAs */
+    unused_nbytes += u->rewind_safeguard;
 
     if (u->hwbuf_size > unused_nbytes)
         limit_nbytes = u->hwbuf_size - unused_nbytes;
@@ -1271,6 +1510,7 @@ static void thread_func(void *userdata) {
 
     for (;;) {
         int ret;
+        pa_usec_t rtpoll_sleep = 0;
 
 #ifdef DEBUG_TIMING
         pa_log_debug("Loop");
@@ -1280,15 +1520,16 @@ static void thread_func(void *userdata) {
         if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
             int work_done;
             pa_usec_t sleep_usec = 0;
+            pa_bool_t on_timeout = pa_rtpoll_timer_elapsed(u->rtpoll);
 
             if (PA_UNLIKELY(u->sink->thread_info.rewind_requested))
                 if (process_rewind(u) < 0)
                         goto fail;
 
             if (u->use_mmap)
-                work_done = mmap_write(u, &sleep_usec, revents & POLLOUT);
+                work_done = mmap_write(u, &sleep_usec, revents & POLLOUT, on_timeout);
             else
-                work_done = unix_write(u, &sleep_usec, revents & POLLOUT);
+                work_done = unix_write(u, &sleep_usec, revents & POLLOUT, on_timeout);
 
             if (work_done < 0)
                 goto fail;
@@ -1302,6 +1543,8 @@ static void thread_func(void *userdata) {
                     snd_pcm_start(u->pcm_handle);
 
                     pa_smoother_resume(u->smoother, pa_rtclock_now(), TRUE);
+
+                    u->first = FALSE;
                 }
 
                 update_smoother(u);
@@ -1320,7 +1563,7 @@ static void thread_func(void *userdata) {
                      * we have filled the buffer at least once
                      * completely.*/
 
-                    if (pa_log_ratelimit())
+                    if (pa_log_ratelimit(PA_LOG_DEBUG))
                         pa_log_debug("Cutting sleep time for the initial iterations by half.");
                     sleep_usec /= 2;
                 }
@@ -1336,21 +1579,32 @@ static void thread_func(void *userdata) {
 /*                 pa_log_debug("Waking up in %0.2fms (system clock).", (double) cusec / PA_USEC_PER_MSEC); */
 
                 /* We don't trust the conversion, so we wake up whatever comes first */
-                pa_rtpoll_set_timer_relative(u->rtpoll, PA_MIN(sleep_usec, cusec));
+                rtpoll_sleep = PA_MIN(sleep_usec, cusec);
             }
 
-            u->first = FALSE;
             u->after_rewind = FALSE;
 
-        } else if (u->use_tsched)
+        }
+
+        if (u->sink->flags & PA_SINK_SYNC_VOLUME) {
+            pa_usec_t volume_sleep;
+            pa_sink_volume_change_apply(u->sink, &volume_sleep);
+            if (volume_sleep > 0)
+                rtpoll_sleep = PA_MIN(volume_sleep, rtpoll_sleep);
+        }
 
-            /* OK, we're in an invalid state, let's disable our timers */
+        if (rtpoll_sleep > 0)
+            pa_rtpoll_set_timer_relative(u->rtpoll, rtpoll_sleep);
+        else
             pa_rtpoll_set_timer_disabled(u->rtpoll);
 
         /* Hmm, nothing to do. Let's sleep */
         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
             goto fail;
 
+        if (u->sink->flags & PA_SINK_SYNC_VOLUME)
+            pa_sink_volume_change_apply(u->sink, NULL);
+
         if (ret == 0)
             goto finish;
 
@@ -1373,7 +1627,7 @@ static void thread_func(void *userdata) {
 
                 u->first = TRUE;
                 u->since_start = 0;
-            } else if (revents && u->use_tsched && pa_log_ratelimit())
+            } else if (revents && u->use_tsched && pa_log_ratelimit(PA_LOG_DEBUG))
                 pa_log_debug("Wakeup from ALSA!");
 
         } else
@@ -1469,7 +1723,7 @@ fail:
     }
 }
 
-static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
+static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB, pa_bool_t sync_volume) {
     pa_assert(u);
 
     if (!u->mixer_handle)
@@ -1505,9 +1759,9 @@ static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
             return 0;
     }
 
-    if (!u->mixer_path->has_volume)
+    if (!u->mixer_path->has_volume) {
         pa_log_info("Driver does not support hardware volume control, falling back to software volume control.");
-    else {
+    else {
 
         if (u->mixer_path->has_dB) {
             pa_log_info("Hardware volume ranges from %0.2f dB to %0.2f dB.", u->mixer_path->min_dB, u->mixer_path->max_dB);
@@ -1515,10 +1769,7 @@ static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
             u->sink->base_volume = pa_sw_volume_from_dB(-u->mixer_path->max_dB);
             u->sink->n_volume_steps = PA_VOLUME_NORM+1;
 
-            if (u->mixer_path->max_dB > 0.0)
-                pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(u->sink->base_volume));
-            else
-                pa_log_info("No particular base volume set, fixing to 0 dB");
+            pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(u->sink->base_volume));
 
         } else {
             pa_log_info("Hardware volume ranges from %li to %li.", u->mixer_path->min_volume, u->mixer_path->max_volume);
@@ -1526,33 +1777,53 @@ static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
             u->sink->n_volume_steps = u->mixer_path->max_volume - u->mixer_path->min_volume + 1;
         }
 
-        u->sink->get_volume = sink_get_volume_cb;
-        u->sink->set_volume = sink_set_volume_cb;
+        pa_sink_set_get_volume_callback(u->sink, sink_get_volume_cb);
+        pa_sink_set_set_volume_callback(u->sink, sink_set_volume_cb);
+
+        if (u->mixer_path->has_dB) {
+            u->sink->flags |= PA_SINK_DECIBEL_VOLUME;
+            if (sync_volume) {
+                pa_sink_set_write_volume_callback(u->sink, sink_write_volume_cb);
+                pa_log_info("Successfully enabled synchronous volume.");
+            }
+        }
 
-        u->sink->flags |= PA_SINK_HW_VOLUME_CTRL | (u->mixer_path->has_dB ? PA_SINK_DECIBEL_VOLUME : 0);
         pa_log_info("Using hardware volume control. Hardware dB scale %s.", u->mixer_path->has_dB ? "supported" : "not supported");
     }
 
     if (!u->mixer_path->has_mute) {
         pa_log_info("Driver does not support hardware mute control, falling back to software mute control.");
     } else {
-        u->sink->get_mute = sink_get_mute_cb;
-        u->sink->set_mute = sink_set_mute_cb;
-        u->sink->flags |= PA_SINK_HW_MUTE_CTRL;
+        pa_sink_set_get_mute_callback(u->sink, sink_get_mute_cb);
+        pa_sink_set_set_mute_callback(u->sink, sink_set_mute_cb);
         pa_log_info("Using hardware mute control.");
     }
 
-    u->mixer_fdl = pa_alsa_fdlist_new();
+    if (u->mixer_path->has_volume || u->mixer_path->has_mute) {
+        int (*mixer_callback)(snd_mixer_elem_t *, unsigned int);
+        if (u->sink->flags & PA_SINK_SYNC_VOLUME) {
+            u->mixer_pd = pa_alsa_mixer_pdata_new();
+            mixer_callback = io_mixer_callback;
 
-    if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, u->core->mainloop) < 0) {
-        pa_log("Failed to initialize file descriptor monitoring");
-        return -1;
-    }
+            if (pa_alsa_set_mixer_rtpoll(u->mixer_pd, u->mixer_handle, u->rtpoll) < 0) {
+                pa_log("Failed to initialize file descriptor monitoring");
+                return -1;
+            }
+        } else {
+            u->mixer_fdl = pa_alsa_fdlist_new();
+            mixer_callback = ctl_mixer_callback;
 
-    if (u->mixer_path_set)
-        pa_alsa_path_set_set_callback(u->mixer_path_set, u->mixer_handle, mixer_callback, u);
-    else
-        pa_alsa_path_set_callback(u->mixer_path, u->mixer_handle, mixer_callback, u);
+            if (pa_alsa_fdlist_set_mixer(u->mixer_fdl, u->mixer_handle, u->core->mainloop) < 0) {
+                pa_log("Failed to initialize file descriptor monitoring");
+                return -1;
+            }
+        }
+
+        if (u->mixer_path_set)
+            pa_alsa_path_set_set_callback(u->mixer_path_set, u->mixer_handle, mixer_callback, u);
+        else
+            pa_alsa_path_set_callback(u->mixer_path, u->mixer_handle, mixer_callback, u);
+    }
 
     return 0;
 }
@@ -1563,10 +1834,10 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     const char *dev_id = NULL;
     pa_sample_spec ss, requested_ss;
     pa_channel_map map;
-    uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
-    snd_pcm_uframes_t period_frames, tsched_frames;
+    uint32_t nfrags, frag_size, buffer_size, tsched_size, tsched_watermark, rewind_safeguard;
+    snd_pcm_uframes_t period_frames, buffer_frames, tsched_frames;
     size_t frame_size;
-    pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE;
+    pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE, namereg_fail = FALSE, sync_volume = FALSE;
     pa_sink_new_data data;
     pa_alsa_profile_set *profile_set = NULL;
 
@@ -1598,8 +1869,10 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         goto fail;
     }
 
-    hwbuf_size = frag_size * nfrags;
+    buffer_size = nfrags * frag_size;
+
     period_frames = frag_size/frame_size;
+    buffer_frames = buffer_size/frame_size;
     tsched_frames = tsched_size/frame_size;
 
     if (pa_modargs_get_value_boolean(ma, "mmap", &use_mmap) < 0) {
@@ -1617,23 +1890,33 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         goto fail;
     }
 
-    if (use_tsched && !pa_rtclock_hrtimer()) {
-        pa_log_notice("Disabling timer-based scheduling because high-resolution timers are not available from the kernel.");
-        use_tsched = FALSE;
+    rewind_safeguard = PA_MAX(DEFAULT_REWIND_SAFEGUARD_BYTES, pa_usec_to_bytes(DEFAULT_REWIND_SAFEGUARD_USEC, &ss));
+    if (pa_modargs_get_value_u32(ma, "rewind_safeguard", &rewind_safeguard) < 0) {
+        pa_log("Failed to parse rewind_safeguard argument");
+        goto fail;
+    }
+
+    sync_volume = m->core->sync_volume;
+    if (pa_modargs_get_value_boolean(ma, "sync_volume", &sync_volume) < 0) {
+        pa_log("Failed to parse sync_volume argument.");
+        goto fail;
     }
 
+    use_tsched = pa_alsa_may_tsched(use_tsched);
+
     u = pa_xnew0(struct userdata, 1);
     u->core = m->core;
     u->module = m;
     u->use_mmap = use_mmap;
     u->use_tsched = use_tsched;
     u->first = TRUE;
+    u->rewind_safeguard = rewind_safeguard;
     u->rtpoll = pa_rtpoll_new();
     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 
     u->smoother = pa_smoother_new(
-            DEFAULT_TSCHED_BUFFER_USEC*2,
-            DEFAULT_TSCHED_BUFFER_USEC*2,
+            SMOOTHER_ADJUST_USEC,
+            SMOOTHER_WINDOW_USEC,
             TRUE,
             TRUE,
             5,
@@ -1666,9 +1949,8 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, mapping)))
-
             goto fail;
 
     } else if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
@@ -1681,9 +1963,8 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, profile_set, &mapping)))
-
             goto fail;
 
     } else {
@@ -1693,7 +1974,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, FALSE)))
             goto fail;
     }
@@ -1719,11 +2000,6 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         u->use_tsched = use_tsched = FALSE;
     }
 
-    if (use_tsched && !pa_alsa_pcm_is_hw(u->pcm_handle)) {
-        pa_log_info("Device is not a hardware device, disabling timer-based scheduling.");
-        u->use_tsched = use_tsched = FALSE;
-    }
-
     if (u->use_mmap)
         pa_log_info("Successfully enabled mmap() mode.");
 
@@ -1740,12 +2016,25 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     data.module = m;
     data.card = card;
     set_sink_name(&data, ma, dev_id, u->device_name, mapping);
+
+    /* We need to give pa_modargs_get_value_boolean() a pointer to a local
+     * variable instead of using &data.namereg_fail directly, because
+     * data.namereg_fail is a bitfield and taking the address of a bitfield
+     * variable is impossible. */
+    namereg_fail = data.namereg_fail;
+    if (pa_modargs_get_value_boolean(ma, "namereg_fail", &namereg_fail) < 0) {
+        pa_log("Failed to parse boolean argument namereg_fail.");
+        pa_sink_new_data_done(&data);
+        goto fail;
+    }
+    data.namereg_fail = namereg_fail;
+
     pa_sink_new_data_set_sample_spec(&data, &ss);
     pa_sink_new_data_set_channel_map(&data, &map);
 
     pa_alsa_init_proplist_pcm(m->core, data.proplist, u->pcm_handle);
     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->device_name);
-    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_BUFFER_SIZE, "%lu", (unsigned long) (period_frames * frame_size * nfrags));
+    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_BUFFER_SIZE, "%lu", (unsigned long) (buffer_frames * frame_size));
     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_BUFFERING_FRAGMENT_SIZE, "%lu", (unsigned long) (period_frames * frame_size));
     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_ACCESS_MODE, u->use_tsched ? "mmap+timer" : (u->use_mmap ? "mmap" : "serial"));
 
@@ -1776,8 +2065,21 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         goto fail;
     }
 
+    if (pa_modargs_get_value_u32(ma, "sync_volume_safety_margin",
+                                 &u->sink->thread_info.volume_change_safety_margin) < 0) {
+        pa_log("Failed to parse sync_volume_safety_margin parameter");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_s32(ma, "sync_volume_extra_delay",
+                                 &u->sink->thread_info.volume_change_extra_delay) < 0) {
+        pa_log("Failed to parse sync_volume_extra_delay parameter");
+        goto fail;
+    }
+
     u->sink->parent.process_msg = sink_process_msg;
-    u->sink->update_requested_latency = sink_update_requested_latency_cb;
+    if (u->use_tsched)
+        u->sink->update_requested_latency = sink_update_requested_latency_cb;
     u->sink->set_state = sink_set_state_cb;
     u->sink->set_port = sink_set_port_cb;
     u->sink->userdata = u;
@@ -1786,21 +2088,33 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 
     u->frame_size = frame_size;
-    u->fragment_size = frag_size = (uint32_t) (period_frames * frame_size);
-    u->nfragments = nfrags;
-    u->hwbuf_size = u->fragment_size * nfrags;
-    u->tsched_watermark = pa_usec_to_bytes_round_up(pa_bytes_to_usec_round_up(tsched_watermark, &requested_ss), &u->sink->sample_spec);
+    u->fragment_size = frag_size = (size_t) (period_frames * frame_size);
+    u->hwbuf_size = buffer_size = (size_t) (buffer_frames * frame_size);
     pa_cvolume_mute(&u->hardware_volume, u->sink->sample_spec.channels);
 
-    pa_log_info("Using %u fragments of size %lu bytes, buffer time is %0.2fms",
-                nfrags, (long unsigned) u->fragment_size,
+    pa_log_info("Using %0.1f fragments of size %lu bytes (%0.2fms), buffer size is %lu bytes (%0.2fms)",
+                (double) u->hwbuf_size / (double) u->fragment_size,
+                (long unsigned) u->fragment_size,
+                (double) pa_bytes_to_usec(u->fragment_size, &ss) / PA_USEC_PER_MSEC,
+                (long unsigned) u->hwbuf_size,
                 (double) pa_bytes_to_usec(u->hwbuf_size, &ss) / PA_USEC_PER_MSEC);
 
     pa_sink_set_max_request(u->sink, u->hwbuf_size);
-    pa_sink_set_max_rewind(u->sink, u->hwbuf_size);
+    if (pa_alsa_pcm_is_hw(u->pcm_handle))
+        pa_sink_set_max_rewind(u->sink, u->hwbuf_size);
+    else {
+        pa_log_info("Disabling rewind for device %s", u->device_name);
+        pa_sink_set_max_rewind(u->sink, 0);
+    }
 
     if (u->use_tsched) {
-        u->watermark_step = pa_usec_to_bytes(TSCHED_WATERMARK_STEP_USEC, &u->sink->sample_spec);
+        u->tsched_watermark = pa_usec_to_bytes_round_up(pa_bytes_to_usec_round_up(tsched_watermark, &requested_ss), &u->sink->sample_spec);
+
+        u->watermark_inc_step = pa_usec_to_bytes(TSCHED_WATERMARK_INC_STEP_USEC, &u->sink->sample_spec);
+        u->watermark_dec_step = pa_usec_to_bytes(TSCHED_WATERMARK_DEC_STEP_USEC, &u->sink->sample_spec);
+
+        u->watermark_inc_threshold = pa_usec_to_bytes_round_up(TSCHED_WATERMARK_INC_THRESHOLD_USEC, &u->sink->sample_spec);
+        u->watermark_dec_threshold = pa_usec_to_bytes_round_up(TSCHED_WATERMARK_DEC_THRESHOLD_USEC, &u->sink->sample_spec);
 
         fix_min_sleep_wakeup(u);
         fix_tsched_watermark(u);
@@ -1819,12 +2133,12 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     if (update_sw_params(u) < 0)
         goto fail;
 
-    if (setup_mixer(u, ignore_dB) < 0)
+    if (setup_mixer(u, ignore_dB, sync_volume) < 0)
         goto fail;
 
     pa_alsa_dump(PA_LOG_DEBUG, u->pcm_handle);
 
-    if (!(u->thread = pa_thread_new(thread_func, u))) {
+    if (!(u->thread = pa_thread_new("alsa-sink", thread_func, u))) {
         pa_log("Failed to create thread.");
         goto fail;
     }
@@ -1883,6 +2197,9 @@ static void userdata_free(struct userdata *u) {
     if (u->memchunk.memblock)
         pa_memblock_unref(u->memchunk.memblock);
 
+    if (u->mixer_pd)
+        pa_alsa_mixer_pdata_free(u->mixer_pd);
+
     if (u->alsa_rtpoll_item)
         pa_rtpoll_item_free(u->alsa_rtpoll_item);