Completely rework ALSA device selection code: choose the device to open depending on the requested number of channels and channel map. In most cases it will now suffice to set default-channels=6 to enable 5.1 sound for all devices that support it

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2050 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 38 insertions, 47 deletions

diff --git a/src/modules/module-alsa-sink.c b/src/modules/module-alsa-sink.c
index 636b413c..e62b8a06 100644
--- a/src/modules/module-alsa-sink.c
+++ b/src/modules/module-alsa-sink.c
@@ -57,6 +57,7 @@ PA_MODULE_LOAD_ONCE(FALSE);
 PA_MODULE_USAGE(
         "sink_name=<name for the sink> "
         "device=<ALSA device> "
+        "device_id=<ALSA device id> "
         "format=<sample format> "
         "channels=<number of channels> "
         "rate=<sample rate> "
@@ -89,15 +90,16 @@ struct userdata {
 
     char *device_name;
 
-    int use_mmap;
+    pa_bool_t use_mmap;
 
-    int first;
+    pa_bool_t first;
 
     pa_rtpoll_item *alsa_rtpoll_item;
 };
 
 static const char* const valid_modargs[] = {
     "device",
+    "device_id",
     "sink_name",
     "format",
     "channels",
@@ -127,7 +129,7 @@ static int mmap_write(struct userdata *u) {
 
             if (n == -EPIPE) {
                 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
-                u->first = 1;
+                u->first = TRUE;
             }
 
             if ((err = snd_pcm_recover(u->pcm_handle, n, 1)) == 0)
@@ -151,7 +153,7 @@ static int mmap_write(struct userdata *u) {
 
             if (err == -EPIPE) {
                 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
-                u->first = 1;
+                u->first = TRUE;
             }
 
             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
@@ -188,7 +190,7 @@ static int mmap_write(struct userdata *u) {
 
             if (err == -EPIPE) {
                 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
-                u->first = 1;
+                u->first = TRUE;
             }
 
             if ((err = snd_pcm_recover(u->pcm_handle, err, 1)) == 0)
@@ -355,7 +357,8 @@ static int suspend(struct userdata *u) {
 
 static int unsuspend(struct userdata *u) {
     pa_sample_spec ss;
-    int err, b;
+    int err;
+    pa_bool_t b;
     unsigned nfrags;
     snd_pcm_uframes_t period_size;
 
@@ -375,7 +378,7 @@ static int unsuspend(struct userdata *u) {
     period_size = u->fragment_size / u->frame_size;
     b = u->use_mmap;
 
-    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
+    if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b, TRUE)) < 0) {
         pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
         goto fail;
     }
@@ -405,7 +408,7 @@ static int unsuspend(struct userdata *u) {
 
     /* FIXME: We need to reload the volume somehow */
 
-    u->first = 1;
+    u->first = TRUE;
 
     pa_log_info("Resumed successfully...");
 
@@ -628,7 +631,7 @@ static void thread_func(void *userdata) {
             if (work_done && u->first) {
                 pa_log_info("Starting playback.");
                 snd_pcm_start(u->pcm_handle);
-                u->first = 0;
+                u->first = FALSE;
                 continue;
             }
         }
@@ -709,7 +712,7 @@ int pa__init(pa_module*m) {
 
     pa_modargs *ma = NULL;
     struct userdata *u = NULL;
-    char *dev;
+    const char *dev_id;
     pa_sample_spec ss;
     pa_channel_map map;
     uint32_t nfrags, frag_size;
@@ -721,7 +724,7 @@ int pa__init(pa_module*m) {
     const char *name;
     char *name_buf = NULL;
     int namereg_fail;
-    int use_mmap = 1, b;
+    pa_bool_t use_mmap = TRUE, b;
 
     snd_pcm_info_alloca(&pcm_info);
 
@@ -761,7 +764,7 @@ int pa__init(pa_module*m) {
     u->module = m;
     m->userdata = u;
     u->use_mmap = use_mmap;
-    u->first = 1;
+    u->first = TRUE;
     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
     u->rtpoll = pa_rtpoll_new();
     u->alsa_rtpoll_item = NULL;
@@ -769,43 +772,35 @@ int pa__init(pa_module*m) {
 
     snd_config_update_free_global();
 
-    dev = pa_xstrdup(pa_modargs_get_value(ma, "device", DEFAULT_DEVICE));
-
-    for (;;) {
-
-        if ((err = snd_pcm_open(&u->pcm_handle, dev, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK)) < 0) {
-            pa_log("Error opening PCM device %s: %s", dev, snd_strerror(err));
-            pa_xfree(dev);
-            goto fail;
-        }
+    b = use_mmap;
 
-        b = use_mmap;
-        if ((err = pa_alsa_set_hw_params(u->pcm_handle, &ss, &nfrags, &period_size, &b)) < 0) {
+    if ((dev_id = pa_modargs_get_value(ma, "device_id", NULL))) {
 
-            if (err == -EPERM) {
-                /* Hmm, some hw is very exotic, so we retry with plughw, if hw didn't work */
+        if (!(u->pcm_handle = pa_alsa_open_by_device_id(
+                      dev_id,
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_PLAYBACK,
+                      &nfrags, &period_size,
+                      &b)))
 
-                if (pa_startswith(dev, "hw:")) {
-                    char *d = pa_sprintf_malloc("plughw:%s", dev+3);
-                    pa_log_debug("Opening the device as '%s' didn't work, retrying with '%s'.", dev, d);
-                    pa_xfree(dev);
-                    dev = d;
+            goto fail;
 
-                    snd_pcm_close(u->pcm_handle);
-                    u->pcm_handle = NULL;
-                    continue;
-                }
-            }
+    } else {
 
-            pa_log("Failed to set hardware parameters: %s", snd_strerror(err));
-            pa_xfree(dev);
+        if (!(u->pcm_handle = pa_alsa_open_by_device_string(
+                      pa_modargs_get_value(ma, "device", DEFAULT_DEVICE),
+                      &u->device_name,
+                      &ss, &map,
+                      SND_PCM_STREAM_PLAYBACK,
+                      &nfrags, &period_size,
+                      &b)))
             goto fail;
-        }
 
-        break;
     }
 
-    u->device_name = dev;
+    pa_assert(u->device_name);
+    pa_log_info("Successfully opened device %s.", u->device_name);
 
     if (use_mmap && !b) {
         pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
@@ -828,15 +823,11 @@ int pa__init(pa_module*m) {
     /* ALSA might tweak the sample spec, so recalculate the frame size */
     frame_size = pa_frame_size(&ss);
 
-    if (ss.channels != map.channels)
-        /* Seems ALSA didn't like the channel number, so let's fix the channel map */
-        pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
-
     if ((err = snd_mixer_open(&u->mixer_handle, 0)) < 0)
         pa_log_warn("Error opening mixer: %s", snd_strerror(err));
     else {
 
-        if ((pa_alsa_prepare_mixer(u->mixer_handle, dev) < 0) ||
+        if ((pa_alsa_prepare_mixer(u->mixer_handle, u->device_name) < 0) ||
             !(u->mixer_elem = pa_alsa_find_elem(u->mixer_handle, "Master", "PCM"))) {
 
             snd_mixer_close(u->mixer_handle);
@@ -847,7 +838,7 @@ int pa__init(pa_module*m) {
     if ((name = pa_modargs_get_value(ma, "sink_name", NULL)))
         namereg_fail = 1;
     else {
-        name = name_buf = pa_sprintf_malloc("alsa_output.%s", dev);
+        name = name_buf = pa_sprintf_malloc("alsa_output.%s", u->device_name);
         namereg_fail = 0;
     }
 
@@ -867,7 +858,7 @@ int pa__init(pa_module*m) {
     pa_sink_set_rtpoll(u->sink, u->rtpoll);
     pa_sink_set_description(u->sink, t = pa_sprintf_malloc(
                                     "ALSA PCM on %s (%s)%s",
-                                    dev,
+                                    u->device_name,
                                     snd_pcm_info_get_name(pcm_info),
                                     use_mmap ? " via DMA" : ""));
     pa_xfree(t);