]> code.delx.au - pulseaudio/blobdiff - src/modules/alsa/alsa-source.c
sink,source: Add the ability to disable alternat sample rate switching
[pulseaudio] / src / modules / alsa / alsa-source.c
index 336027a275c7216d311a85cec0e3f8d00b8bc66a..180baca947b6a4c0f7f077eeee90cc3d615c0fc6 100644 (file)
 
 #include <asoundlib.h>
 
-#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-error.h>
 #include <pulsecore/core.h>
+#include <pulsecore/i18n.h>
 #include <pulsecore/module.h>
 #include <pulsecore/memchunk.h>
 #include <pulsecore/sink.h>
@@ -46,7 +45,6 @@
 #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 */
-#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)  /* 20ms */
-#define TSCHED_WATERMARK_STEP_USEC (10*PA_USEC_PER_MSEC)     /* 10ms */
-#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC)          /* 10ms */
-#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC)          /* 4ms */
 
-#define SMOOTHER_MIN_INTERVAL (2*PA_USEC_PER_MSEC)           /* 2ms */
-#define SMOOTHER_MAX_INTERVAL (200*PA_USEC_PER_MSEC)         /* 200ms */
+#define DEFAULT_TSCHED_BUFFER_USEC (2*PA_USEC_PER_SEC)             /* 2s */
+#define DEFAULT_TSCHED_WATERMARK_USEC (20*PA_USEC_PER_MSEC)        /* 20ms */
+
+#define TSCHED_WATERMARK_INC_STEP_USEC (10*PA_USEC_PER_MSEC)       /* 10ms  */
+#define TSCHED_WATERMARK_DEC_STEP_USEC (5*PA_USEC_PER_MSEC)        /* 5ms */
+#define TSCHED_WATERMARK_VERIFY_AFTER_USEC (20*PA_USEC_PER_SEC)    /* 20s */
+#define TSCHED_WATERMARK_INC_THRESHOLD_USEC (0*PA_USEC_PER_MSEC)   /* 0ms */
+#define TSCHED_WATERMARK_DEC_THRESHOLD_USEC (100*PA_USEC_PER_MSEC) /* 100ms */
+#define TSCHED_WATERMARK_STEP_USEC (10*PA_USEC_PER_MSEC)           /* 10ms */
+
+#define TSCHED_MIN_SLEEP_USEC (10*PA_USEC_PER_MSEC)                /* 10ms */
+#define TSCHED_MIN_WAKEUP_USEC (4*PA_USEC_PER_MSEC)                /* 4ms */
+
+#define SMOOTHER_WINDOW_USEC  (10*PA_USEC_PER_SEC)                 /* 10s */
+#define SMOOTHER_ADJUST_USEC  (1*PA_USEC_PER_SEC)                  /* 1s */
+
+#define SMOOTHER_MIN_INTERVAL (2*PA_USEC_PER_MSEC)                 /* 2ms */
+#define SMOOTHER_MAX_INTERVAL (200*PA_USEC_PER_MSEC)               /* 200ms */
 
 #define VOLUME_ACCURACY (PA_VOLUME_NORM/100)
 
@@ -81,7 +90,9 @@ struct userdata {
 
     snd_pcm_t *pcm_handle;
 
+    char *paths_dir;
     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;
@@ -93,17 +104,24 @@ struct userdata {
         fragment_size,
         hwbuf_size,
         tsched_watermark,
+        tsched_watermark_ref,
         hwbuf_unused,
         min_sleep,
         min_wakeup,
-        watermark_step;
+        watermark_inc_step,
+        watermark_dec_step,
+        watermark_inc_threshold,
+        watermark_dec_threshold;
 
-    unsigned nfragments;
+    pa_usec_t watermark_dec_not_before;
+    pa_usec_t min_latency_ref;
 
-    char *device_name;
-    char *control_device;
+    char *device_name;  /* name of the PCM device */
+    char *control_device; /* name of the control device */
 
-    pa_bool_t use_mmap:1, use_tsched:1;
+    pa_bool_t use_mmap:1, use_tsched:1, deferred_volume:1;
+
+    pa_bool_t first;
 
     pa_rtpoll_item *alsa_rtpoll_item;
 
@@ -169,10 +187,10 @@ static int reserve_init(struct userdata *u, const char *dname) {
     if (pa_in_system_mode())
         return 0;
 
-    /* We are resuming, try to lock the device */
     if (!(rname = pa_alsa_get_reserve_name(dname)))
         return 0;
 
+    /* We are resuming, try to lock the device */
     u->reserve = pa_reserve_wrapper_get(u->core, rname);
     pa_xfree(rname);
 
@@ -222,10 +240,10 @@ static int reserve_monitor_init(struct userdata *u, const char *dname) {
     if (pa_in_system_mode())
         return 0;
 
-    /* We are resuming, try to lock the device */
     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);
 
@@ -240,7 +258,9 @@ static int reserve_monitor_init(struct userdata *u, const char *dname) {
 
 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->source->sample_spec);
@@ -255,6 +275,7 @@ 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;
 
@@ -265,7 +286,7 @@ static void fix_tsched_watermark(struct userdata *u) {
         u->tsched_watermark = u->min_wakeup;
 }
 
-static void adjust_after_overrun(struct userdata *u) {
+static void increase_watermark(struct userdata *u) {
     size_t old_watermark;
     pa_usec_t old_min_latency, new_min_latency;
 
@@ -274,36 +295,72 @@ static void adjust_after_overrun(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->source->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->source->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->source->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->source->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_source_set_latency_range_within_thread(u->source, new_min_latency, u->source->thread_info.max_latency);
-        return;
     }
 
     /* When we reach this we're officialy fucked! */
 }
 
-static pa_usec_t hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_usec_t*process_usec) {
+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->source->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 wm, usec;
 
+    pa_assert(sleep_usec);
+    pa_assert(process_usec);
+
     pa_assert(u);
+    pa_assert(u->use_tsched);
 
     usec = pa_source_get_requested_latency_within_thread(u->source);
 
@@ -324,8 +381,6 @@ static pa_usec_t hw_sleep_time(struct userdata *u, pa_usec_t *sleep_usec, pa_use
                  (unsigned long) (*sleep_usec / PA_USEC_PER_MSEC),
                  (unsigned long) (*process_usec / PA_USEC_PER_MSEC));
 #endif
-
-    return usec;
 }
 
 static int try_recover(struct userdata *u, const char *call, int err) {
@@ -348,44 +403,64 @@ static int try_recover(struct userdata *u, const char *call, int err) {
         return -1;
     }
 
-    snd_pcm_start(u->pcm_handle);
+    u->first = TRUE;
     return 0;
 }
 
-static size_t check_left_to_record(struct userdata *u, size_t n_bytes) {
+static size_t check_left_to_record(struct userdata *u, size_t n_bytes, pa_bool_t on_timeout) {
     size_t left_to_record;
     size_t rec_space = u->hwbuf_size - u->hwbuf_unused;
+    pa_bool_t overrun = FALSE;
 
     /* We use <= instead of < for this check here because an overrun
      * 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 <= rec_space) {
+    if (n_bytes <= rec_space)
         left_to_record = rec_space - n_bytes;
+    else {
 
-#ifdef DEBUG_TIMING
-        pa_log_debug("%0.2f ms left to record", (double) pa_bytes_to_usec(left_to_record, &u->source->sample_spec) / PA_USEC_PER_MSEC);
-#endif
-
-    } else {
+        /* We got a dropout. What a mess! */
         left_to_record = 0;
+        overrun = TRUE;
 
 #ifdef DEBUG_TIMING
         PA_DEBUG_TRAP;
 #endif
 
-        if (pa_log_ratelimit())
+        if (pa_log_ratelimit(PA_LOG_INFO))
             pa_log_info("Overrun!");
+    }
 
-        if (u->use_tsched)
-            adjust_after_overrun(u);
+#ifdef DEBUG_TIMING
+    pa_log_debug("%0.2f ms left to record", (double) pa_bytes_to_usec(left_to_record, &u->source->sample_spec) / PA_USEC_PER_MSEC);
+#endif
+
+    if (u->use_tsched) {
+        pa_bool_t reset_not_before = TRUE;
+
+        if (overrun || left_to_record < u->watermark_inc_threshold)
+            increase_watermark(u);
+        else if (left_to_record > u->watermark_dec_threshold) {
+            reset_not_before = FALSE;
+
+            /* 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 (on_timeout)
+                decrease_watermark(u);
+        }
+
+        if (reset_not_before)
+            u->watermark_dec_not_before = 0;
     }
 
     return left_to_record;
 }
 
-static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+static int mmap_read(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_record;
@@ -417,7 +492,8 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         pa_log_debug("avail: %lu", (unsigned long) n_bytes);
 #endif
 
-        left_to_record = check_left_to_record(u, n_bytes);
+        left_to_record = check_left_to_record(u, n_bytes, on_timeout);
+        on_timeout = FALSE;
 
         if (u->use_tsched)
             if (!polled &&
@@ -446,6 +522,7 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
             break;
         }
 
+
         if (++j > 10) {
 #ifdef DEBUG_TIMING
             pa_log_debug("Not filling up, because already too many iterations.");
@@ -461,15 +538,14 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
 #endif
 
         for (;;) {
+            pa_memchunk chunk;
+            void *p;
             int err;
             const snd_pcm_channel_area_t *areas;
             snd_pcm_uframes_t offset, frames;
-            pa_memchunk chunk;
-            void *p;
             snd_pcm_sframes_t sframes;
 
             frames = (snd_pcm_uframes_t) (n_bytes / u->frame_size);
-
 /*             pa_log_debug("%lu frames to read", (unsigned long) frames); */
 
             if (PA_UNLIKELY((err = pa_alsa_safe_mmap_begin(u->pcm_handle, &areas, &offset, &frames, u->hwbuf_size, &u->source->sample_spec)) < 0)) {
@@ -484,8 +560,8 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
             }
 
             /* Make sure that if these memblocks need to be copied they will fit into one slot */
-            if (frames > pa_mempool_block_size_max(u->source->core->mempool)/u->frame_size)
-                frames = pa_mempool_block_size_max(u->source->core->mempool)/u->frame_size;
+            if (frames > pa_mempool_block_size_max(u->core->mempool)/u->frame_size)
+                frames = pa_mempool_block_size_max(u->core->mempool)/u->frame_size;
 
             if (!after_avail && frames == 0)
                 break;
@@ -533,17 +609,20 @@ static int mmap_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+        process_usec = pa_bytes_to_usec(u->tsched_watermark, &u->source->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
-        *sleep_usec = 0;
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    }
 
     return work_done ? 1 : 0;
 }
 
-static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled) {
+static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled, pa_bool_t on_timeout) {
     int work_done = FALSE;
     pa_usec_t max_sleep_usec = 0, process_usec = 0;
     size_t left_to_record;
@@ -570,7 +649,8 @@ static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         }
 
         n_bytes = (size_t) n * u->frame_size;
-        left_to_record = check_left_to_record(u, n_bytes);
+        left_to_record = check_left_to_record(u, n_bytes, on_timeout);
+        on_timeout = FALSE;
 
         if (u->use_tsched)
             if (!polled &&
@@ -659,12 +739,15 @@ static int unix_read(struct userdata *u, pa_usec_t *sleep_usec, pa_bool_t polled
         }
     }
 
-    *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+    if (u->use_tsched) {
+        *sleep_usec = pa_bytes_to_usec(left_to_record, &u->source->sample_spec);
+        process_usec = pa_bytes_to_usec(u->tsched_watermark, &u->source->sample_spec);
 
-    if (*sleep_usec > process_usec)
-        *sleep_usec -= process_usec;
-    else
-        *sleep_usec = 0;
+        if (*sleep_usec > process_usec)
+            *sleep_usec -= process_usec;
+        else
+            *sleep_usec = 0;
+    }
 
     return work_done ? 1 : 0;
 }
@@ -683,7 +766,7 @@ 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->source->sample_spec)) < 0)) {
+    if (PA_UNLIKELY((err = pa_alsa_safe_delay(u->pcm_handle, &delay, u->hwbuf_size, &u->source->sample_spec, TRUE)) < 0)) {
         pa_log_warn("Failed to get delay: %s", pa_alsa_strerror(err));
         return;
     }
@@ -716,7 +799,7 @@ static void update_smoother(struct userdata *u) {
 }
 
 static pa_usec_t source_get_latency(struct userdata *u) {
-   int64_t delay;
+    int64_t delay;
     pa_usec_t now1, now2;
 
     pa_assert(u);
@@ -742,6 +825,7 @@ static int build_pollfd(struct userdata *u) {
     return 0;
 }
 
+/* Called from IO context */
 static int suspend(struct userdata *u) {
     pa_assert(u);
     pa_assert(u->pcm_handle);
@@ -762,13 +846,14 @@ static int suspend(struct userdata *u) {
     return 0;
 }
 
+/* Called from IO context */
 static int update_sw_params(struct userdata *u) {
     snd_pcm_uframes_t avail_min;
     int err;
 
     pa_assert(u);
 
-    /* Use the full buffer if noone asked us for anything specific */
+    /* Use the full buffer if no one asked us for anything specific */
     u->hwbuf_unused = 0;
 
     if (u->use_tsched) {
@@ -806,7 +891,7 @@ 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;
     }
@@ -814,12 +899,47 @@ static int update_sw_params(struct userdata *u) {
     return 0;
 }
 
+/* Called from IO Context on unsuspend or from main thread when creating source */
+static void reset_watermark(struct userdata *u, size_t tsched_watermark, pa_sample_spec *ss,
+                            pa_bool_t in_thread)
+{
+    u->tsched_watermark = pa_usec_to_bytes_round_up(pa_bytes_to_usec_round_up(tsched_watermark, ss),
+                                                    &u->source->sample_spec);
+
+    u->watermark_inc_step = pa_usec_to_bytes(TSCHED_WATERMARK_INC_STEP_USEC, &u->source->sample_spec);
+    u->watermark_dec_step = pa_usec_to_bytes(TSCHED_WATERMARK_DEC_STEP_USEC, &u->source->sample_spec);
+
+    u->watermark_inc_threshold = pa_usec_to_bytes_round_up(TSCHED_WATERMARK_INC_THRESHOLD_USEC, &u->source->sample_spec);
+    u->watermark_dec_threshold = pa_usec_to_bytes_round_up(TSCHED_WATERMARK_DEC_THRESHOLD_USEC, &u->source->sample_spec);
+
+    fix_min_sleep_wakeup(u);
+    fix_tsched_watermark(u);
+
+    if (in_thread)
+        pa_source_set_latency_range_within_thread(u->source,
+                                                  u->min_latency_ref,
+                                                  pa_bytes_to_usec(u->hwbuf_size, ss));
+    else {
+        pa_source_set_latency_range(u->source,
+                                    0,
+                                    pa_bytes_to_usec(u->hwbuf_size, ss));
+
+        /* work-around assert in pa_source_set_latency_within_thead,
+           keep track of min_latency and reuse it when
+           this routine is called from IO context */
+        u->min_latency_ref = u->source->thread_info.min_latency;
+    }
+
+    pa_log_info("Time scheduling watermark is %0.2fms",
+                (double) pa_bytes_to_usec(u->tsched_watermark, ss) / PA_USEC_PER_MSEC);
+}
+
+/* Called from IO context */
 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);
@@ -827,7 +947,7 @@ 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_CAPTURE,
-                            /*SND_PCM_NONBLOCK|*/
+                            SND_PCM_NONBLOCK|
                             SND_PCM_NO_AUTO_RESAMPLE|
                             SND_PCM_NO_AUTO_CHANNELS|
                             SND_PCM_NO_AUTO_FORMAT)) < 0) {
@@ -836,12 +956,12 @@ static int unsuspend(struct userdata *u) {
     }
 
     ss = u->source->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;
     }
@@ -856,10 +976,11 @@ 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;
     }
 
@@ -871,13 +992,17 @@ static int unsuspend(struct userdata *u) {
 
     /* FIXME: We need to reload the volume somehow */
 
-    snd_pcm_start(u->pcm_handle);
-
     u->read_count = 0;
     pa_smoother_reset(u->smoother, pa_rtclock_now(), TRUE);
     u->smoother_interval = SMOOTHER_MIN_INTERVAL;
     u->last_smoother_update = 0;
 
+    u->first = TRUE;
+
+    /* reset the watermark to the value defined when source was created */
+    if (u->use_tsched)
+        reset_watermark(u, u->tsched_watermark_ref, &u->source->sample_spec, TRUE);
+
     pa_log_info("Resumed successfully...");
 
     return 0;
@@ -888,9 +1013,10 @@ fail:
         u->pcm_handle = NULL;
     }
 
-    return -1;
+    return -PA_ERR_IO;
 }
 
+/* Called from IO context */
 static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
     struct userdata *u = PA_SOURCE(o)->userdata;
 
@@ -911,30 +1037,33 @@ static int source_process_msg(pa_msgobject *o, int code, void *data, int64_t off
 
             switch ((pa_source_state_t) PA_PTR_TO_UINT(data)) {
 
-                case PA_SOURCE_SUSPENDED:
+                case PA_SOURCE_SUSPENDED: {
+                    int r;
+
                     pa_assert(PA_SOURCE_IS_OPENED(u->source->thread_info.state));
 
-                    if (suspend(u) < 0)
-                        return -1;
+                    if ((r = suspend(u)) < 0)
+                        return r;
 
                     break;
+                }
 
                 case PA_SOURCE_IDLE:
-                case PA_SOURCE_RUNNING:
+                case PA_SOURCE_RUNNING: {
+                    int r;
 
                     if (u->source->thread_info.state == PA_SOURCE_INIT) {
                         if (build_pollfd(u) < 0)
-                            return -1;
-
-                        snd_pcm_start(u->pcm_handle);
+                            return -PA_ERR_IO;
                     }
 
                     if (u->source->thread_info.state == PA_SOURCE_SUSPENDED) {
-                        if (unsuspend(u) < 0)
-                            return -1;
+                        if ((r = unsuspend(u)) < 0)
+                            return r;
                     }
 
                     break;
+                }
 
                 case PA_SOURCE_UNLINKED:
                 case PA_SOURCE_INIT:
@@ -958,16 +1087,16 @@ static int source_set_state_cb(pa_source *s, pa_source_state_t new_state) {
 
     old_state = pa_source_get_state(u->source);
 
-    if (PA_SINK_IS_OPENED(old_state) && new_state == PA_SINK_SUSPENDED)
+    if (PA_SOURCE_IS_OPENED(old_state) && new_state == PA_SOURCE_SUSPENDED)
         reserve_done(u);
-    else if (old_state == PA_SINK_SUSPENDED && PA_SINK_IS_OPENED(new_state))
+    else if (old_state == PA_SOURCE_SUSPENDED && PA_SOURCE_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);
@@ -976,6 +1105,12 @@ static int mixer_callback(snd_mixer_elem_t *elem, unsigned int mask) {
     if (mask == SND_CTL_EVENT_MASK_REMOVE)
         return 0;
 
+    if (!PA_SOURCE_IS_LINKED(u->source->state))
+        return 0;
+
+    if (u->source->suspend_cause & PA_SUSPEND_SESSION)
+        return 0;
+
     if (mask & SND_CTL_EVENT_MASK_VALUE) {
         pa_source_get_volume(u->source, TRUE);
         pa_source_get_mute(u->source, TRUE);
@@ -984,10 +1119,28 @@ 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->source->suspend_cause & PA_SUSPEND_SESSION)
+        return 0;
+
+    if (mask & SND_CTL_EVENT_MASK_VALUE)
+        pa_source_update_volume_and_mute(u->source);
+
+    return 0;
+}
+
 static void source_get_volume_cb(pa_source *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);
@@ -999,12 +1152,18 @@ static void source_get_volume_cb(pa_source *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;
 
-    s->volume = u->hardware_volume = r;
+    s->real_volume = u->hardware_volume = r;
 
     /* Hmm, so the hardware volume changed, let's reset our software volume */
     if (u->mixer_path->has_dB)
@@ -1014,16 +1173,17 @@ static void source_get_volume_cb(pa_source *s) {
 static void source_set_volume_cb(pa_source *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 deferred_volume = !!(s->flags & PA_SOURCE_DEFERRED_VOLUME);
 
     pa_assert(u);
     pa_assert(u->mixer_path);
     pa_assert(u->mixer_handle);
 
     /* Shift up by the base volume */
-    pa_sw_cvolume_divide_scalar(&r, &s->volume, s->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, deferred_volume, !deferred_volume) < 0)
         return;
 
     /* Shift down by the base volume, so that 0dB becomes maximum volume */
@@ -1034,9 +1194,10 @@ static void source_set_volume_cb(pa_source *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->volume, &u->hardware_volume);
+        pa_sw_cvolume_divide(&new_soft_volume, &s->real_volume, &u->hardware_volume);
 
         /* If the adjustment to do in software is only minimal we
          * can skip it. That saves us CPU at the expense of a bit of
@@ -1045,21 +1206,67 @@ static void source_set_volume_cb(pa_source *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->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 */
 
-        s->volume = r;
+        s->real_volume = r;
+    }
+}
+
+static void source_write_volume_cb(pa_source *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_SOURCE_DEFERRED_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));
+        }
     }
 }
 
@@ -1087,6 +1294,55 @@ static void source_set_mute_cb(pa_source *s) {
     pa_alsa_path_set_mute(u->mixer_path, u->mixer_handle, s->muted);
 }
 
+static void mixer_volume_init(struct userdata *u) {
+    pa_assert(u);
+
+    if (!u->mixer_path->has_volume) {
+        pa_source_set_write_volume_callback(u->source, NULL);
+        pa_source_set_get_volume_callback(u->source, NULL);
+        pa_source_set_set_volume_callback(u->source, NULL);
+
+        pa_log_info("Driver does not support hardware volume control, falling back to software volume control.");
+    } else {
+        pa_source_set_get_volume_callback(u->source, source_get_volume_cb);
+        pa_source_set_set_volume_callback(u->source, source_set_volume_cb);
+
+        if (u->mixer_path->has_dB && u->deferred_volume) {
+            pa_source_set_write_volume_callback(u->source, source_write_volume_cb);
+            pa_log_info("Successfully enabled synchronous volume.");
+        } else
+            pa_source_set_write_volume_callback(u->source, NULL);
+
+        if (u->mixer_path->has_dB) {
+            pa_source_enable_decibel_volume(u->source, TRUE);
+            pa_log_info("Hardware volume ranges from %0.2f dB to %0.2f dB.", u->mixer_path->min_dB, u->mixer_path->max_dB);
+
+            u->source->base_volume = pa_sw_volume_from_dB(-u->mixer_path->max_dB);
+            u->source->n_volume_steps = PA_VOLUME_NORM+1;
+
+            pa_log_info("Fixing base volume to %0.2f dB", pa_sw_volume_to_dB(u->source->base_volume));
+        } else {
+            pa_source_enable_decibel_volume(u->source, FALSE);
+            pa_log_info("Hardware volume ranges from %li to %li.", u->mixer_path->min_volume, u->mixer_path->max_volume);
+
+            u->source->base_volume = PA_VOLUME_NORM;
+            u->source->n_volume_steps = u->mixer_path->max_volume - u->mixer_path->min_volume + 1;
+        }
+
+        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_source_set_get_mute_callback(u->source, NULL);
+        pa_source_set_set_mute_callback(u->source, NULL);
+        pa_log_info("Driver does not support hardware mute control, falling back to software mute control.");
+    } else {
+        pa_source_set_get_mute_callback(u->source, source_get_mute_cb);
+        pa_source_set_set_mute_callback(u->source, source_set_mute_cb);
+        pa_log_info("Using hardware mute control.");
+    }
+}
+
 static int source_set_port_cb(pa_source *s, pa_device_port *p) {
     struct userdata *u = s->userdata;
     pa_alsa_port_data *data;
@@ -1100,18 +1356,7 @@ static int source_set_port_cb(pa_source *s, pa_device_port *p) {
     pa_assert_se(u->mixer_path = data->path);
     pa_alsa_path_select(u->mixer_path, u->mixer_handle);
 
-    if (u->mixer_path->has_volume && u->mixer_path->has_dB) {
-        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");
-    } else {
-        s->base_volume = PA_VOLUME_NORM;
-        s->n_volume_steps = u->mixer_path->max_volume - u->mixer_path->min_volume + 1;
-    }
+    mixer_volume_init(u);
 
     if (data->setting)
         pa_alsa_setting_select(data->setting, u->mixer_handle);
@@ -1127,6 +1372,9 @@ static int source_set_port_cb(pa_source *s, pa_device_port *p) {
 static void source_update_requested_latency_cb(pa_source *s) {
     struct userdata *u = s->userdata;
     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;
@@ -1134,6 +1382,19 @@ static void source_update_requested_latency_cb(pa_source *s) {
     update_sw_params(u);
 }
 
+static pa_bool_t source_update_rate_cb(pa_source *s, uint32_t rate)
+{
+    struct userdata *u = s->userdata;
+    pa_assert(u);
+
+    if (!PA_SOURCE_IS_OPENED(s->state)) {
+        pa_log_info("Updating rate for device %s, new rate is %d", u->device_name, rate);
+        u->source->sample_spec.rate = rate;
+        return TRUE;
+    }
+    return FALSE;
+}
+
 static void thread_func(void *userdata) {
     struct userdata *u = userdata;
     unsigned short revents = 0;
@@ -1149,6 +1410,7 @@ static void thread_func(void *userdata) {
 
     for (;;) {
         int ret;
+        pa_usec_t rtpoll_sleep = 0;
 
 #ifdef DEBUG_TIMING
         pa_log_debug("Loop");
@@ -1158,11 +1420,21 @@ static void thread_func(void *userdata) {
         if (PA_SOURCE_IS_OPENED(u->source->thread_info.state)) {
             int work_done;
             pa_usec_t sleep_usec = 0;
+            pa_bool_t on_timeout = pa_rtpoll_timer_elapsed(u->rtpoll);
+
+            if (u->first) {
+                pa_log_info("Starting capture.");
+                snd_pcm_start(u->pcm_handle);
+
+                pa_smoother_resume(u->smoother, pa_rtclock_now(), TRUE);
+
+                u->first = FALSE;
+            }
 
             if (u->use_mmap)
-                work_done = mmap_read(u, &sleep_usec, revents & POLLIN);
+                work_done = mmap_read(u, &sleep_usec, revents & POLLIN, on_timeout);
             else
-                work_done = unix_read(u, &sleep_usec, revents & POLLIN);
+                work_done = unix_read(u, &sleep_usec, revents & POLLIN, on_timeout);
 
             if (work_done < 0)
                 goto fail;
@@ -1187,17 +1459,33 @@ 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);
             }
-        } else if (u->use_tsched)
+        }
+
+        if (u->source->flags & PA_SOURCE_DEFERRED_VOLUME) {
+            pa_usec_t volume_sleep;
+            pa_source_volume_change_apply(u->source, &volume_sleep);
+            if (volume_sleep > 0) {
+                if (rtpoll_sleep > 0)
+                    rtpoll_sleep = PA_MIN(volume_sleep, rtpoll_sleep);
+                else
+                    rtpoll_sleep = volume_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->source->flags & PA_SOURCE_DEFERRED_VOLUME)
+            pa_source_volume_change_apply(u->source, NULL);
+
         if (ret == 0)
             goto finish;
 
@@ -1218,8 +1506,9 @@ static void thread_func(void *userdata) {
                 if (pa_alsa_recover_from_poll(u->pcm_handle, revents) < 0)
                     goto fail;
 
-                snd_pcm_start(u->pcm_handle);
-            } else if (revents && u->use_tsched && pa_log_ratelimit())
+                u->first = TRUE;
+                revents = 0;
+            } else if (revents && u->use_tsched && pa_log_ratelimit(PA_LOG_DEBUG))
                 pa_log_debug("Wakeup from ALSA!");
 
         } else
@@ -1288,13 +1577,10 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
         pa_alsa_path_dump(u->mixer_path);
     } else {
 
-        if (!(u->mixer_path_set = pa_alsa_path_set_new(mapping, PA_ALSA_DIRECTION_INPUT)))
+        if (!(u->mixer_path_set = pa_alsa_path_set_new(mapping, PA_ALSA_DIRECTION_INPUT, u->paths_dir)))
             goto fail;
 
         pa_alsa_path_set_probe(u->mixer_path_set, u->mixer_handle, ignore_dB);
-
-        pa_log_debug("Probed mixer paths:");
-        pa_alsa_path_set_dump(u->mixer_path_set);
     }
 
     return;
@@ -1316,6 +1602,8 @@ fail:
 }
 
 static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
+    pa_bool_t need_mixer_callback = FALSE;
+
     pa_assert(u);
 
     if (!u->mixer_handle)
@@ -1351,54 +1639,45 @@ static int setup_mixer(struct userdata *u, pa_bool_t ignore_dB) {
             return 0;
     }
 
-    if (!u->mixer_path->has_volume)
-        pa_log_info("Driver does not support hardware volume control, falling back to software volume control.");
-    else {
+    mixer_volume_init(u);
 
-        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);
+    /* Will we need to register callbacks? */
+    if (u->mixer_path_set && u->mixer_path_set->paths) {
+        pa_alsa_path *p;
 
-            u->source->base_volume = pa_sw_volume_from_dB(-u->mixer_path->max_dB);
-            u->source->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->source->base_volume));
-            else
-                pa_log_info("No particular base volume set, fixing to 0 dB");
-
-        } else {
-            pa_log_info("Hardware volume ranges from %li to %li.", u->mixer_path->min_volume, u->mixer_path->max_volume);
-            u->source->base_volume = PA_VOLUME_NORM;
-            u->source->n_volume_steps = u->mixer_path->max_volume - u->mixer_path->min_volume + 1;
+        PA_LLIST_FOREACH(p, u->mixer_path_set->paths) {
+            if (p->has_volume || p->has_mute)
+                need_mixer_callback = TRUE;
         }
-
-        u->source->get_volume = source_get_volume_cb;
-        u->source->set_volume = source_set_volume_cb;
-
-        u->source->flags |= PA_SOURCE_HW_VOLUME_CTRL | (u->mixer_path->has_dB ? PA_SOURCE_DECIBEL_VOLUME : 0);
-        pa_log_info("Using hardware volume control. Hardware dB scale %s.", u->mixer_path->has_dB ? "supported" : "not supported");
     }
+    else if (u->mixer_path)
+        need_mixer_callback = u->mixer_path->has_volume || u->mixer_path->has_mute;
 
-    if (!u->mixer_path->has_mute) {
-        pa_log_info("Driver does not support hardware mute control, falling back to software mute control.");
-    } else {
-        u->source->get_mute = source_get_mute_cb;
-        u->source->set_mute = source_set_mute_cb;
-        u->source->flags |= PA_SOURCE_HW_MUTE_CTRL;
-        pa_log_info("Using hardware mute control.");
-    }
+    if (need_mixer_callback) {
+        int (*mixer_callback)(snd_mixer_elem_t *, unsigned int);
+        if (u->source->flags & PA_SOURCE_DEFERRED_VOLUME) {
+            u->mixer_pd = pa_alsa_mixer_pdata_new();
+            mixer_callback = io_mixer_callback;
 
-    u->mixer_fdl = pa_alsa_fdlist_new();
+            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 (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_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);
+        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;
 }
@@ -1407,12 +1686,13 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
 
     struct userdata *u = NULL;
     const char *dev_id = NULL;
-    pa_sample_spec ss, requested_ss;
+    pa_sample_spec ss;
+    uint32_t alternate_sample_rate;
     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;
+    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, deferred_volume = FALSE;
     pa_source_new_data data;
     pa_alsa_profile_set *profile_set = NULL;
 
@@ -1422,11 +1702,16 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     ss = m->core->default_sample_spec;
     map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
-        pa_log("Failed to parse sample specification");
+        pa_log("Failed to parse sample specification and channel map");
+        goto fail;
+    }
+
+    alternate_sample_rate = m->core->alternate_sample_rate;
+    if (pa_modargs_get_alternate_sample_rate(ma, &alternate_sample_rate) < 0) {
+        pa_log("Failed to parse alternate sample rate");
         goto fail;
     }
 
-    requested_ss = ss;
     frame_size = pa_frame_size(&ss);
 
     nfrags = m->core->default_n_fragments;
@@ -1444,8 +1729,10 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         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) {
@@ -1454,7 +1741,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     }
 
     if (pa_modargs_get_value_boolean(ma, "tsched", &use_tsched) < 0) {
-        pa_log("Failed to parse timer_scheduling argument.");
+        pa_log("Failed to parse tsched argument.");
         goto fail;
     }
 
@@ -1463,33 +1750,40 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         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;
+    deferred_volume = m->core->deferred_volume;
+    if (pa_modargs_get_value_boolean(ma, "deferred_volume", &deferred_volume) < 0) {
+        pa_log("Failed to parse deferred_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->deferred_volume = deferred_volume;
+    u->first = TRUE;
     u->rtpoll = pa_rtpoll_new();
     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 
     u->smoother = pa_smoother_new(
-            DEFAULT_TSCHED_WATERMARK_USEC*2,
-            DEFAULT_TSCHED_WATERMARK_USEC*2,
+            SMOOTHER_ADJUST_USEC,
+            SMOOTHER_WINDOW_USEC,
             TRUE,
             TRUE,
             5,
             pa_rtclock_now(),
-            FALSE);
+            TRUE);
     u->smoother_interval = SMOOTHER_MIN_INTERVAL;
 
     dev_id = pa_modargs_get_value(
             ma, "device_id",
             pa_modargs_get_value(ma, "device", DEFAULT_DEVICE));
 
+    u->paths_dir = pa_xstrdup(pa_modargs_get_value(ma, "paths_dir", NULL));
+
     if (reserve_init(u, dev_id) < 0)
         goto fail;
 
@@ -1511,7 +1805,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, mapping)))
             goto fail;
 
@@ -1525,7 +1819,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, profile_set, &mapping)))
             goto fail;
 
@@ -1536,7 +1830,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &u->device_name,
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
-                      &nfrags, &period_frames, tsched_frames,
+                      &period_frames, &buffer_frames, tsched_frames,
                       &b, &d, FALSE)))
             goto fail;
     }
@@ -1562,11 +1856,6 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         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.");
 
@@ -1583,12 +1872,26 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     data.module = m;
     data.card = card;
     set_source_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 namereg_fail argument.");
+        pa_source_new_data_done(&data);
+        goto fail;
+    }
+    data.namereg_fail = namereg_fail;
+
     pa_source_new_data_set_sample_spec(&data, &ss);
     pa_source_new_data_set_channel_map(&data, &map);
+    pa_source_new_data_set_alternate_sample_rate(&data, alternate_sample_rate);
 
     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"));
 
@@ -1619,39 +1922,47 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
         goto fail;
     }
 
+    if (pa_modargs_get_value_u32(ma, "deferred_volume_safety_margin",
+                                 &u->source->thread_info.volume_change_safety_margin) < 0) {
+        pa_log("Failed to parse deferred_volume_safety_margin parameter");
+        goto fail;
+    }
+
+    if (pa_modargs_get_value_s32(ma, "deferred_volume_extra_delay",
+                                 &u->source->thread_info.volume_change_extra_delay) < 0) {
+        pa_log("Failed to parse deferred_volume_extra_delay parameter");
+        goto fail;
+    }
+
     u->source->parent.process_msg = source_process_msg;
-    u->source->update_requested_latency = source_update_requested_latency_cb;
+    if (u->use_tsched)
+        u->source->update_requested_latency = source_update_requested_latency_cb;
     u->source->set_state = source_set_state_cb;
     u->source->set_port = source_set_port_cb;
+    if (u->source->alternate_sample_rate)
+        u->source->update_rate = source_update_rate_cb;
     u->source->userdata = u;
 
     pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
     pa_source_set_rtpoll(u->source, 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->source->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->source->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);
 
     if (u->use_tsched) {
-        u->watermark_step = pa_usec_to_bytes(TSCHED_WATERMARK_STEP_USEC, &u->source->sample_spec);
-
-        fix_min_sleep_wakeup(u);
-        fix_tsched_watermark(u);
-
-        pa_source_set_latency_range(u->source,
-                                    0,
-                                    pa_bytes_to_usec(u->hwbuf_size, &ss));
-
-        pa_log_info("Time scheduling watermark is %0.2fms",
-                    (double) pa_bytes_to_usec(u->tsched_watermark, &ss) / PA_USEC_PER_MSEC);
-    } else
+        u->tsched_watermark_ref = tsched_watermark;
+        reset_watermark(u, u->tsched_watermark_ref, &ss, FALSE);
+    }
+    else
         pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(u->hwbuf_size, &ss));
 
     reserve_update(u);
@@ -1664,10 +1975,11 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
 
     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-source", thread_func, u))) {
         pa_log("Failed to create thread.");
         goto fail;
     }
+
     /* Get initial mixer settings */
     if (data.volume_is_set) {
         if (u->source->set_volume)
@@ -1685,6 +1997,9 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
             u->source->get_mute(u->source);
     }
 
+    if ((data.volume_is_set || data.muted_is_set) && u->source->write_volume)
+        u->source->write_volume(u->source);
+
     pa_source_put(u->source);
 
     if (profile_set)
@@ -1719,6 +2034,9 @@ static void userdata_free(struct userdata *u) {
     if (u->source)
         pa_source_unref(u->source);
 
+    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);
 
@@ -1749,6 +2067,7 @@ static void userdata_free(struct userdata *u) {
 
     pa_xfree(u->device_name);
     pa_xfree(u->control_device);
+    pa_xfree(u->paths_dir);
     pa_xfree(u);
 }