alsa: fall back to 32 bit samples if 24 is not supported

Some sound chips/drivers (e.g. Intel HDA) don't support 24 bit samples, they want to get 32 bit instead. Now that MPD's PCM library supports 32 bit, add a 32 bit fallback when 24 bit is not supported.

alsa: fall back to 32 bit samples if 24 is not supported
72176db4 · Max Kellermann · a5a15bea · 72176db4
Commit 72176db4 authored Mar 02, 2009 by Max Kellermann
Hide whitespace changes
Inline Side-by-side

Showing with 8 additions and 0 deletions

alsa_plugin.c src/output/alsa_plugin.c +8 -0

No files found.
--- a/src/output/alsa_plugin.c
+++ b/src/output/alsa_plugin.c
@@ -255,6 +255,14 @@ configure_hw:
 	}

 	err = snd_pcm_hw_params_set_format(ad->pcm, hwparams, bitformat);
+	if (err == -EINVAL && audio_format->bits == 24) {
+		/* fall back to 32 bit, let pcm_convert.c do the conversion */
+		err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,
+						   SND_PCM_FORMAT_S32);
+		if (err == 0)
+			audio_format->bits = 32;
+	}
+
 	if (err == -EINVAL && audio_format->bits != 16) {
 		/* fall back to 16 bit, let pcm_convert.c do the conversion */
 		err = snd_pcm_hw_params_set_format(ad->pcm, hwparams,