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osxaudiosrc: no resampling on OS X

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Unlike Remote IO, AUHAL doesn't have built-in resampling
for sources -- confirmed by Core Audio engineer Doug Wyatt:
http://lists.apple.com/archives/coreaudio-api/2006/Sep/msg00088.html

https://bugzilla.gnome.org/show_bug.cgi?id=743758
This commit is contained in:
Ilya Konstantinov 2015-04-15 20:13:27 +03:00 committed by Arun Raghavan
parent f33954ae1d
commit e9fbdc3682
1 changed files with 15 additions and 0 deletions
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15
sys/osxaudio/gstosxcoreaudio.c
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@ -624,6 +624,21 @@ gst_core_audio_probe_caps (GstCoreAudio * core_audio, GstCaps * in_caps)
gst_structure_remove_field (out_s, "channel-mask");
}
#ifndef HAVE_IOS
if (core_audio->is_src && got_outer_asbd
&& outer_asbd.mSampleRate != kAudioStreamAnyRate) {
/* According to Core Audio engineer, AUHAL does not support sample rate conversion.
* on sources. Therefore, we fixate the sample rate.
*
* "You definitely cannot do rate conversion as part of getting input from AUHAL.
* That's the most common cause of those "cannot do in current context" errors."
* http://lists.apple.com/archives/coreaudio-api/2006/Sep/msg00088.html
*/
gst_structure_set (out_s, "rate", G_TYPE_INT,
(gint) outer_asbd.mSampleRate, NULL);
}
#endif
/* Special cases for upmixing and downmixing.
* Other than that, the AUs don't upmix or downmix multi-channel audio,
* e.g. if you push 5.1-surround audio to a stereo configuration,