simplify pa_alsa_init_proplist_pcm() a bit and include resolution bits in alsa device props

src/modules/alsa/alsa-sink.c

@@ -1236,14 +1236,11 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
     snd_pcm_uframes_t period_frames, tsched_frames;
     size_t frame_size;
-    snd_pcm_info_t *pcm_info = NULL;
     int err;
     pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE;
     pa_usec_t usec;
     pa_sink_new_data data;
 
-    snd_pcm_info_alloca(&pcm_info);
-
     pa_assert(m);
     pa_assert(ma);
 
@@ -1378,11 +1375,6 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     if (u->use_tsched)
         pa_log_info("Successfully enabled timer-based scheduling mode.");
 
-    if ((err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
-        pa_log("Error fetching PCM info: %s", snd_strerror(err));
-        goto fail;
-    }
-
     /* ALSA might tweak the sample spec, so recalculate the frame size */
     frame_size = pa_frame_size(&ss);
 
@@ -1396,7 +1388,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     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, pcm_info);
+    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_FRAGMENT_SIZE, "%lu", (unsigned long) (period_frames * frame_size));

src/modules/alsa/alsa-source.c

@@ -1071,13 +1071,10 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     uint32_t nfrags, hwbuf_size, frag_size, tsched_size, tsched_watermark;
     snd_pcm_uframes_t period_frames, tsched_frames;
     size_t frame_size;
-    snd_pcm_info_t *pcm_info = NULL;
     int err;
     pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE;
     pa_source_new_data data;
 
-    snd_pcm_info_alloca(&pcm_info);
-
     pa_assert(m);
 
     ss = m->core->default_sample_spec;
@@ -1203,11 +1200,6 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     if (u->use_tsched)
         pa_log_info("Successfully enabled timer-based scheduling mode.");
 
-    if ((err = snd_pcm_info(u->pcm_handle, pcm_info)) < 0) {
-        pa_log("Error fetching PCM info: %s", snd_strerror(err));
-        goto fail;
-    }
-
     /* ALSA might tweak the sample spec, so recalculate the frame size */
     frame_size = pa_frame_size(&ss);
 
@@ -1221,7 +1213,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     pa_source_new_data_set_sample_spec(&data, &ss);
     pa_source_new_data_set_channel_map(&data, &map);
 
-    pa_alsa_init_proplist_pcm(m->core, data.proplist, pcm_info);
+    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_FRAGMENT_SIZE, "%lu", (unsigned long) (period_frames * frame_size));

src/modules/alsa/alsa-util.c

@@ -37,6 +37,7 @@
 #include <pulsecore/macro.h>
 #include <pulsecore/core-util.h>
 #include <pulsecore/atomic.h>
+#include <pulsecore/core-error.h>
 
 #include "alsa-util.h"
 
@@ -1361,7 +1362,7 @@ void pa_alsa_init_proplist_card(pa_core *c, pa_proplist *p, int card) {
 #endif
 }
 
-void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_info) {
+void pa_alsa_init_proplist_pcm_info(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_info) {
 
     static const char * const alsa_class_table[SND_PCM_CLASS_LAST+1] = {
         [SND_PCM_CLASS_GENERIC] = "generic",
@@ -1427,6 +1428,28 @@ void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_i
         pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, n);
 }
 
+void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_t *pcm) {
+    snd_pcm_hw_params_t *hwparams;
+    snd_pcm_info_t *info;
+    int bits, err;
+
+    snd_pcm_hw_params_alloca(&hwparams);
+    snd_pcm_info_alloca(&info);
+
+    if ((err = snd_pcm_hw_params_current(pcm, hwparams)) < 0)
+        pa_log_warn("Error fetching hardware parameter info: %s", snd_strerror(err));
+    else {
+
+        if ((bits = snd_pcm_hw_params_get_sbits(hwparams)) >= 0)
+            pa_proplist_setf(p, "alsa.resolution_bits", "%i", bits);
+    }
+
+    if ((err = snd_pcm_info(pcm, info)) < 0)
+        pa_log_warn("Error fetching PCM info: %s", snd_strerror(err));
+    else
+        pa_alsa_init_proplist_pcm_info(c, p, info);
+}
+
 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
     snd_pcm_state_t state;
     int err;

src/modules/alsa/alsa-util.h

@@ -120,8 +120,9 @@ void pa_alsa_dump_status(snd_pcm_t *pcm);
 void pa_alsa_redirect_errors_inc(void);
 void pa_alsa_redirect_errors_dec(void);
 
-void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_info);
+void pa_alsa_init_proplist_pcm_info(pa_core *c, pa_proplist *p, snd_pcm_info_t *pcm_info);
 void pa_alsa_init_proplist_card(pa_core *c, pa_proplist *p, int card);
+void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_t *pcm);
 
 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents);