audio: Use get_device_alsadev() to support device' specific card/device

Implement support for card and device number specific to a given device.
TODO:
- don't hardcode the card/device for non-alsadev devices.
  Gotta retrieve the numbers using configmgr I guess...
- the ifdef'ed code in out_set_parameters() requires non-const hwstream.
  Probably not the good way to do it...
- mirror support for input devices

Change-Id: Idf34ee23cfcfa02692bcb8914dfdd38ebc1d724c
Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>

Author: vknecht

audio/audio_hw.c

@@ -379,6 +379,9 @@ static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
 
     struct stream_out_common *out = (struct stream_out_common *)stream;
     struct audio_device *adev = out->dev;
+#if 0
+    uint32_t cardnum, devnum;
+#endif
     uint32_t v;
     int ret;
 
@@ -387,6 +390,17 @@ static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
     pthread_mutex_lock(&adev->lock);
 
     if (ret >= 0) {
+#if 0
+        if (get_device_alsadev(adev->cm, v, &cardnum, &devnum) < 0) {
+            ALOGI("restoring params with card=0 dev=2"); // TODO: don't hardcode
+            out->hw->card_number = 0;
+            out->hw->device_number = 2;
+        } else {
+            ALOGI("updating params with card=%u dev=%u", cardnum, devnum);
+            out->hw->card_number = cardnum;
+            out->hw->device_number = devnum;
+        }
+#endif
         apply_route(out->hw, v);
     }
 
@@ -735,6 +749,8 @@ static void out_pcm_fill_params(struct stream_out_pcm *out,
 /* Must be called with hw device and output stream mutexes locked */
 static int start_output_pcm(struct stream_out_pcm *out)
 {
+    struct config_mgr *cm = out->common.dev->cm;
+    uint32_t device, cardnum, devnum;
     int ret;
 
     struct pcm_config config = {
@@ -750,10 +766,21 @@ static int start_output_pcm(struct stream_out_pcm *out)
 
     ALOGV("+start_output_stream(%p)", out);
 
-    out->pcm = pcm_open(out->common.hw->card_number,
-                        out->common.hw->device_number,
-                        PCM_OUT | PCM_MONOTONIC,
-                        &config);
+    device = get_current_routes(out->common.hw);
+    ret = get_device_alsadev(cm, device, &cardnum, &devnum);
+    if (ret < 0) {
+        ALOGI("device = %u (not alsadev, ret=%d)", device, ret);
+        out->pcm = pcm_open(out->common.hw->card_number,
+                            out->common.hw->device_number,
+                            PCM_OUT | PCM_MONOTONIC,
+                            &config);
+    } else {
+        ALOGI("device = %u (alsadev)", device);
+        out->pcm = pcm_open(cardnum,
+                            devnum,
+                            PCM_OUT | PCM_MONOTONIC,
+                            &config);
+    }
 
     if (out->pcm && !pcm_is_ready(out->pcm)) {
         ALOGE("pcm_open(out) failed: %s", pcm_get_error(out->pcm));