lavd/alsa: implement get_device_list callbacks

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/libavdevice/alsa-audio-common.c b/libavdevice/alsa-audio-common.c
index 4e63397380..749897fe95 100644
--- a/libavdevice/alsa-audio-common.c
+++ b/libavdevice/alsa-audio-common.c
@@ -343,3 +343,55 @@ int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
     s->reorder_buf_size = size;
     return 0;
 }
+
+/* ported from alsa-utils/aplay.c */
+int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
+{
+    int ret = 0;
+    void **hints, **n;
+    char *name = NULL, *descr = NULL, *io = NULL, *tmp;
+    AVDeviceInfo *new_device = NULL;
+    const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";
+
+    if (snd_device_name_hint(-1, "pcm", &hints) < 0)
+        return AVERROR_EXTERNAL;
+    n = hints;
+    while (*n && !ret) {
+        name = snd_device_name_get_hint(*n, "NAME");
+        descr = snd_device_name_get_hint(*n, "DESC");
+        io = snd_device_name_get_hint(*n, "IOID");
+        if (!io || !strcmp(io, filter)) {
+            new_device = av_mallocz(sizeof(AVDeviceInfo));
+            if (!new_device) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+            new_device->device_name = av_strdup(name);
+            if ((tmp = strrchr(descr, '\n')) && tmp[1])
+                new_device->device_description = av_strdup(&tmp[1]);
+            else
+                new_device->device_description = av_strdup(descr);
+            if (!new_device->device_description || !new_device->device_name) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+            if ((ret = av_dynarray_add_nofree(&device_list->devices,
+                                              &device_list->nb_devices, new_device)) < 0) {
+                goto fail;
+            }
+            new_device = NULL;
+        }
+      fail:
+        free(io);
+        free(name);
+        free(descr);
+        n++;
+    }
+    if (new_device) {
+        av_free(new_device->device_description);
+        av_free(new_device->device_name);
+        av_free(new_device);
+    }
+    snd_device_name_free_hint(hints);
+    return ret;
+}