1 files changed, 76 insertions, 0 deletions
diff --git a/audio/audio.c b/audio/audio.c
new file mode 100644
index 0000000000..c9d5c9231c
--- /dev/null
+++ b/audio/audio.c
@@ -0,0 +1,76 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+
+#include "core/mp_talloc.h"
+#include "audio.h"
+
+void mp_audio_set_format(struct mp_audio *mpa, int format)
+{
+    mpa->format = format;
+    mpa->bps = af_fmt2bits(format) / 8;
+}
+
+void mp_audio_set_num_channels(struct mp_audio *mpa, int num_channels)
+{
+    struct mp_chmap map;
+    mp_chmap_from_channels(&map, num_channels);
+    mp_audio_set_channels(mpa, &map);
+}
+
+// Use old MPlayer/ALSA channel layout.
+void mp_audio_set_channels_old(struct mp_audio *mpa, int num_channels)
+{
+    struct mp_chmap map;
+    mp_chmap_from_channels_alsa(&map, num_channels);
+    mp_audio_set_channels(mpa, &map);
+}
+
+void mp_audio_set_channels(struct mp_audio *mpa, const struct mp_chmap *chmap)
+{
+    assert(mp_chmap_is_empty(chmap) || mp_chmap_is_valid(chmap));
+    mpa->channels = *chmap;
+    mpa->nch = mpa->channels.num;
+}
+
+void mp_audio_copy_config(struct mp_audio *dst, const struct mp_audio *src)
+{
+    mp_audio_set_format(dst, src->format);
+    mp_audio_set_channels(dst, &src->channels);
+    dst->rate = src->rate;
+}
+
+bool mp_audio_config_equals(const struct mp_audio *a, const struct mp_audio *b)
+{
+    return a->format == b->format && a->rate == b->rate &&
+           mp_chmap_equals(&a->channels, &b->channels);
+}
+
+char *mp_audio_fmt_to_str(int srate, const struct mp_chmap *chmap, int format)
+{
+    char *chstr = mp_chmap_to_str(chmap);
+    char *res = talloc_asprintf(NULL, "%dHz %s %dch %s", srate, chstr,
+                                chmap->num, af_fmt2str_short(format));
+    talloc_free(chstr);
+    return res;
+}
+
+char *mp_audio_config_to_str(struct mp_audio *mpa)
+{
+    return mp_audio_fmt_to_str(mpa->rate, &mpa->channels, mpa->format);
+}