osxaudiosink not working on iOS 12

[jml5qh]

I'm having an issue when using osxaudiosink on iOS 12. It looks like iOS 12
sets the AudioChannelLayout.mChannelLayoutTag = 6619138. However, in
gstosxcoreaudio, GStreamer only supports mChannelLayoutTag =
kAudioChannelLayoutTag_UseChannelDescriptions.

if (layout->mChannelLayoutTag !=
      kAudioChannelLayoutTag_UseChannelDescriptions) {
    GST_ERROR
        ("Only kAudioChannelLayoutTag_UseChannelDescriptions is
supported.");
    *channels = 0;
    *channel_mask = 0;
    return FALSE;
  }

Is this an iOS 12 bug or something GStreamer needs to update.



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Hi

Il 30/07/2018 19:59, jml5qh ha scritto:

I'm having an issue when using osxaudiosink on iOS 12. It looks like iOS 12
sets the AudioChannelLayout.mChannelLayoutTag = 6619138. 

I think this value mean kAudioChannelLayoutTag_Stereo

https://developer.apple.com/documentation/coreaudio/1572101-audio_channel_layout_tags/kaudiochannellayouttag_stereo?language=objc

and the channel layout should be something like the "case 2" in the actual GStreamer code

https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/sys/osxaudio/gstosxcoreaudio.c#n365

probably a patch to gstosxcoreaudio is needed, the patch should be not too hard to write, I'll try to fix this bug myself if the problem still happen after iOS 12 release

Nicola

However, in
gstosxcoreaudio, GStreamer only supports mChannelLayoutTag =
kAudioChannelLayoutTag_UseChannelDescriptions.

if (layout->mChannelLayoutTag !=
      kAudioChannelLayoutTag_UseChannelDescriptions) {
    GST_ERROR
        ("Only kAudioChannelLayoutTag_UseChannelDescriptions is
supported.");
    *channels = 0;
    *channel_mask = 0;
    return FALSE;
  }

Is this an iOS 12 bug or something GStreamer needs to update.



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[jml5qh]

Thank you Nicola! I've had some communication with Apple and it sounds like
they will not be fixing the issue. Do you think this is something that can
be fixed before iOS 12? If iOS 12 launches without this fix, the audio
streaming in our app will be broken. It also affects our entire RTSP stream.



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Il 17/08/18 15:04, jml5qh ha scritto:
> Thank you Nicola! I've had some communication with Apple and it sounds like
> they will not be fixing the issue. Do you think this is something that can
> be fixed before iOS 12?

I'll try to fix it as soon as my iphone will receive iOS 12, this is my
personal phone I don't install beta versions sorry, so you have to wait
or try to fix it yourself,

after the bug is fixed you have to compile a custom GStreamer version
until the fix is included in official binaries anyway

Nicola

>   If iOS 12 launches without this fix, the audio
> streaming in our app will be broken. It also affects our entire RTSP stream.
>
>
>
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[kleincodes]

Hi there,

I just wanted to leave a comment on this thread that we are having the same
issue. We have made a patch and are working on submitting it. If you have
any instructions on how to successfully submit the patch, that would be
greatly appreciated. You can find more here:
https://bugzilla.gnome.org/show_bug.cgi?id=796919

Thanks!



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The issue should be fixed now:

https://cgit.freedesktop.org/gstreamer/gst-plugins-good/commit/?id=3573f71c911de35b61cb4a82d41a39e0f5e060fc

please report if you have any issues after applying this patch,

Nicola

Il 17/08/18 15:04, jml5qh ha scritto:

> Thank you Nicola! I've had some communication with Apple and it sounds like
> they will not be fixing the issue. Do you think this is something that can
> be fixed before iOS 12? If iOS 12 launches without this fix, the audio
> streaming in our app will be broken. It also affects our entire RTSP stream.
>
>
>
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[jade]

Hi,

I have the same issue when using osxaudiosink on IOS 12.

After read your reply for this issue, I tried to compile a custom GStreamer
version, but after installed the new version GStreamer, run my APP,  I got
error as following:

ld: warning: -read_only_relocs cannot be used with arm64
Undefined symbols for architecture arm64:
  "_avcodec_find_decoder_by_name", referenced from:
      _gst_ffmpeg_caps_to_codecid in
GStreamer(libgstlibav_a_arm64_-gstavcodecmap.c.o)
  "_av_mallocz", referenced from:
      _gst_ffmpeg_caps_with_codecid in
GStreamer(libgstlibav_a_arm64_-gstavcodecmap.c.o)
  "_av_stereo3d_create_side_data", referenced from:
      _gst_ffmpegvidenc_handle_frame in
GStreamer(libgstlibav_a_arm64_-gstavvidenc.c.o)
  "_av_frame_copy", referenced from:
      _get_output_buffer in GStreamer(libgstlibav_a_arm64_-gstavviddec.c.o)
  "_av_packet_new_side_data", referenced from:
      _gst_ffmpegviddec_handle_frame in
GStreamer(libgstlibav_a_arm64_-gstavviddec.c.o)
  "_av_write_trailer", referenced from:
      _gst_ffmpegmux_collected in
GStreamer(libgstlibav_a_arm64_-gstavmux.c.o)
  "_avformat_write_header", referenced from:
………………

 "_avformat_find_stream_info", referenced from:
      _gst_ffmpeg_av_find_stream_info in
GStreamer(libgstlibav_a_arm64_-gstav.c.o)
  "_av_codec_is_decoder", referenced from:
      _gst_ffmpegauddec_register in
GStreamer(libgstlibav_a_arm64_-gstavauddec.c.o)
      _gst_ffmpegviddec_register in
GStreamer(libgstlibav_a_arm64_-gstavviddec.c.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

Has anyone complied the new version GStreamer with this patch successfully ?
Jade



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