implement snd_pcm_get_chmap

2 files changed, 21 insertions, 1 deletions

diff --git a/libasound.c b/libasound.c
index 8aff21e..26329f9 100644
--- a/libasound.c
+++ b/libasound.c
@@ -978,4 +978,25 @@ snd_pcm_get_params(snd_pcm_t *pcm, snd_pcm_uframes_t *buffer_size, snd_pcm_ufram
    return 0;
 }
 
+snd_pcm_chmap_t*
+snd_pcm_get_chmap(snd_pcm_t *pcm)
+{
+   const unsigned int nc = (pcm->stream == SND_PCM_STREAM_PLAYBACK ? pcm->hw.par.pchan : pcm->hw.par.rchan);
+
+   snd_pcm_chmap_t *map;
+   if (!(map = calloc(1, sizeof(*map) + nc)))
+      return NULL;
+
+   map->channels = nc;
+
+   if (nc == 1) {
+      map->pos[0] = SND_CHMAP_MONO;
+   } else if (nc == 2) {
+      map->pos[0] = SND_CHMAP_FL;
+      map->pos[1] = SND_CHMAP_FR;
+   }
+
+   return map;
+}
+
 #include "symversioning-hell.h"
diff --git a/stubs.h b/stubs.h
index c0367b6..19cd160 100644
--- a/stubs.h
+++ b/stubs.h
@@ -509,7 +509,6 @@ int snd_pcm_unlink(snd_pcm_t *pcm) { WARNX1("stub"); return 0; }
 snd_pcm_chmap_query_t **snd_pcm_query_chmaps(snd_pcm_t *pcm) { WARNX1("stub"); return NULL; }
 snd_pcm_chmap_query_t **snd_pcm_query_chmaps_from_hw(int card, int dev, int subdev, snd_pcm_stream_t stream) { WARNX1("stub"); return NULL; }
 void snd_pcm_free_chmaps(snd_pcm_chmap_query_t **maps) { WARNX1("stub");  }
-snd_pcm_chmap_t *snd_pcm_get_chmap(snd_pcm_t *pcm) { WARNX1("stub"); return NULL; }
 int snd_pcm_set_chmap(snd_pcm_t *pcm, const snd_pcm_chmap_t *map) { WARNX1("stub"); return 0; }
 const char *snd_pcm_chmap_type_name(enum snd_pcm_chmap_type val) { WARNX1("stub"); return NULL; }
 const char *snd_pcm_chmap_name(enum snd_pcm_chmap_position val) { WARNX1("stub"); return NULL; }