alsa-util: Perform format and rate detection before setting HW params

Perform detection of supported sample format and rates just after device is
opened, before `snd_pcm_hw_params()` is called for the first time. This fixes a
problem where device restricts available sample rates after HW params are set
preventing sample rate detection (seen with UAC2 devices and kernel 6.1.9)

Bug: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1414
Bug: https://github.com/alsa-project/alsa-lib/issues/119
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/782>

src/modules/alsa/alsa-mixer.c

@@ -5074,7 +5074,7 @@ static snd_pcm_t* mapping_open_pcm(pa_alsa_mapping *m,
     handle = pa_alsa_open_by_template(
                               m->device_strings, dev_id, NULL, &try_ss,
                               &try_map, mode, &try_period_size,
-                              &try_buffer_size, 0, NULL, NULL, exact_channels);
+                              &try_buffer_size, 0, NULL, NULL, NULL, NULL, exact_channels);
     if (handle && !exact_channels && m->channel_map.channels != try_map.channels) {
         char buf[PA_CHANNEL_MAP_SNPRINT_MAX];
         pa_log_debug("Channel map for mapping '%s' permanently changed to '%s'", m->name,

src/modules/alsa/alsa-sink.c

@@ -2527,7 +2527,9 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, mapping)))
+                      &b, &d,
+                      &u->supported_formats, &u->supported_rates,
+                      mapping)))
             goto fail;
 
     } else if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
@@ -2541,7 +2543,9 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, profile_set, &mapping)))
+                      &b, &d,
+                      &u->supported_formats, &u->supported_rates,
+                      profile_set, &mapping)))
             goto fail;
 
     } else {
@@ -2552,7 +2556,9 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
                       &ss, &map,
                       SND_PCM_STREAM_PLAYBACK,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, false)))
+                      &b, &d,
+                      &u->supported_formats, &u->supported_rates,
+                      false)))
             goto fail;
     }
 
@@ -2598,13 +2604,11 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
 
     u->verified_sample_spec = ss;
 
-    u->supported_formats = pa_alsa_get_supported_formats(u->pcm_handle, ss.format);
     if (!u->supported_formats) {
         pa_log_error("Failed to find any supported sample formats.");
         goto fail;
     }
 
-    u->supported_rates = pa_alsa_get_supported_rates(u->pcm_handle, ss.rate);
     if (!u->supported_rates) {
         pa_log_error("Failed to find any supported sample rates.");
         goto fail;

src/modules/alsa/alsa-source.c

@@ -2218,7 +2218,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, mapping)))
+                      &b, &d, &u->supported_formats, &u->supported_rates, mapping)))
             goto fail;
 
     } else if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
@@ -2232,7 +2232,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, profile_set, &mapping)))
+                      &b, &d, &u->supported_formats, &u->supported_rates, profile_set, &mapping)))
             goto fail;
 
     } else {
@@ -2243,7 +2243,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
                       &ss, &map,
                       SND_PCM_STREAM_CAPTURE,
                       &period_frames, &buffer_frames, tsched_frames,
-                      &b, &d, false)))
+                      &b, &d, &u->supported_formats, &u->supported_rates, false)))
             goto fail;
     }
 
@@ -2279,13 +2279,11 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
 
     u->verified_sample_spec = ss;
 
-    u->supported_formats = pa_alsa_get_supported_formats(u->pcm_handle, ss.format);
     if (!u->supported_formats) {
         pa_log_error("Failed to find any supported sample formats.");
         goto fail;
     }
 
-    u->supported_rates = pa_alsa_get_supported_rates(u->pcm_handle, ss.rate);
     if (!u->supported_rates) {
         pa_log_error("Failed to find any supported sample rates.");
         goto fail;

src/modules/alsa/alsa-ucm.c

@@ -2026,7 +2026,7 @@ static snd_pcm_t* mapping_open_pcm(pa_alsa_ucm_config *ucm, pa_alsa_mapping *m,
     try_buffer_size = ucm->core->default_n_fragments * try_period_size;
 
     pcm = pa_alsa_open_by_device_string(m->device_strings[0], NULL, &try_ss,
-            &try_map, mode, &try_period_size, &try_buffer_size, 0, NULL, NULL, exact_channels);
+            &try_map, mode, &try_period_size, &try_buffer_size, 0, NULL, NULL, NULL, NULL, exact_channels);
 
     if (pcm) {
         if (!exact_channels)

src/modules/alsa/alsa-util.c

@@ -523,6 +523,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,
         bool *use_tsched,
+        pa_sample_format_t **query_supported_formats,
+        unsigned int **query_supported_rates,
         pa_alsa_profile_set *ps,
         pa_alsa_mapping **mapping) {
 
@@ -561,6 +563,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
                 tsched_size,
                 use_mmap,
                 use_tsched,
+                query_supported_formats,
+                query_supported_rates,
                 m);
 
         if (pcm_handle) {
@@ -588,6 +592,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
                 tsched_size,
                 use_mmap,
                 use_tsched,
+                query_supported_formats,
+                query_supported_rates,
                 m);
 
         if (pcm_handle) {
@@ -612,6 +618,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
             tsched_size,
             use_mmap,
             use_tsched,
+            query_supported_formats,
+            query_supported_rates,
             false);
     pa_xfree(d);
 
@@ -632,6 +640,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_mapping(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,
         bool *use_tsched,
+        pa_sample_format_t **query_supported_formats,
+        unsigned int **query_supported_rates,
         pa_alsa_mapping *m) {
 
     snd_pcm_t *pcm_handle;
@@ -661,6 +671,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_mapping(
             tsched_size,
             use_mmap,
             use_tsched,
+            query_supported_formats,
+            query_supported_rates,
             pa_channel_map_valid(&m->channel_map) /* Query the channel count if we don't know what we want */);
 
     if (!pcm_handle)
@@ -684,6 +696,8 @@ snd_pcm_t *pa_alsa_open_by_device_string(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,
         bool *use_tsched,
+        pa_sample_format_t **query_supported_formats,
+        unsigned int **query_supported_rates,
         bool require_exact_channel_number) {
 
     int err;
@@ -711,6 +725,12 @@ snd_pcm_t *pa_alsa_open_by_device_string(
 
         pa_log_debug("Managed to open %s", d);
 
+        if (query_supported_formats)
+            *query_supported_formats = pa_alsa_get_supported_formats(pcm_handle, ss->format);
+
+        if (query_supported_rates)
+            *query_supported_rates = pa_alsa_get_supported_rates(pcm_handle, ss->rate);
+
         if ((err = pa_alsa_set_hw_params(
                      pcm_handle,
                      ss,
@@ -784,6 +804,8 @@ snd_pcm_t *pa_alsa_open_by_template(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,
         bool *use_tsched,
+        pa_sample_format_t **query_supported_formats,
+        unsigned int **query_supported_rates,
         bool require_exact_channel_number) {
 
     snd_pcm_t *pcm_handle;
@@ -805,6 +827,8 @@ snd_pcm_t *pa_alsa_open_by_template(
                 tsched_size,
                 use_mmap,
                 use_tsched,
+                query_supported_formats,
+                query_supported_rates,
                 require_exact_channel_number);
 
         pa_xfree(d);

src/modules/alsa/alsa-util.h

@@ -67,6 +67,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_auto(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,                   /* modified at return */
         bool *use_tsched,                 /* modified at return */
+        pa_sample_format_t **query_supported_formats, /* modified at return */
+        unsigned int **query_supported_rates,         /* modified at return */
         pa_alsa_profile_set *ps,
         pa_alsa_mapping **mapping);       /* modified at return */
 
@@ -82,6 +84,8 @@ snd_pcm_t *pa_alsa_open_by_device_id_mapping(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,                   /* modified at return */
         bool *use_tsched,                 /* modified at return */
+        pa_sample_format_t **query_supported_formats, /* modified at return */
+        unsigned int **query_supported_rates,         /* modified at return */
         pa_alsa_mapping *mapping);
 
 /* Opens the explicit ALSA device */
@@ -96,6 +100,8 @@ snd_pcm_t *pa_alsa_open_by_device_string(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,                   /* modified at return */
         bool *use_tsched,                 /* modified at return */
+        pa_sample_format_t **query_supported_formats, /* modified at return */
+        unsigned int **query_supported_rates,         /* modified at return */
         bool require_exact_channel_number);
 
 /* Opens the explicit ALSA device with a fallback list */
@@ -111,6 +117,8 @@ snd_pcm_t *pa_alsa_open_by_template(
         snd_pcm_uframes_t tsched_size,
         bool *use_mmap,                   /* modified at return */
         bool *use_tsched,                 /* modified at return */
+        pa_sample_format_t **query_supported_formats, /* modified at return */
+        unsigned int **query_supported_rates,        /* modified at return */
         bool require_exact_channel_number);
 
 void pa_alsa_dump(pa_log_level_t level, snd_pcm_t *pcm);