What's new in QNX Neutrino 7.0: Audio component BuildID 594—January 17, 2018 (7.0.594.S201801171044)

• If you specify an ampersand (&) before the key name in the audio configuration file, the value is appended to the key's current value. See io-audio in the QNX Neutrino Utilities Reference for more information.
• The default value for config_write_delay is now -1, which prevents the settings from ever being written.
• We have added descriptions for the snd_afm_*() functions to the Audio Library to handle Acoustic Management Platform Functional Modules (AFMs) if you have the QNX Acoustic Management Platform 2.0 available.
  Note: If you are migrating your code from Acoustic Management Platform 1.0, the functions names were renamed (i.e., _service_ from the function name). The old function names aren't supported on QNX SDP 7.0.
  • snd_afm_get_audio_mode()
  • snd_afm_get_vin_list()
  • snd_afm_get_vin_list_count()
  • snd_afm_set_audio_mode()
  • snd_afm_set_path()
  • snd_afm_set_vin_stream()
  • snd_afm_start()
  • snd_afm_stop()
  • snd_afm_get_ap_data()
  • snd_afm_load_ap_dataset()
  • snd_afm_set_ap_data()()

• The way that you configure preemption has changed to allow you to be more selective when a preempted audio type moves from the SUSPENDED to PAUSED state. To configure this functionality, you use the preemption and transient keys instead of the premption_by_higher and preemption_by_same keys in the audio policy configuration file. For more information, see “Understanding preemption” and “Syntax of the audio policy configuration file” in the “Audio Management” chapter of this guide.
• The audio configuration file has a new [AUDIOMGMT] section that supports the following new options:
  • Multiple audio management contexts. You can specify an audio policy configuration file for each context, which allows you to specify different policies for each context. For more information, see “Audio Management”.
  • Specify the location of the audio policy configuration file using the policy_conf key. You can no longer provide the location of the audio policy configuration file as an option when you run io-audio.
• This release added audio type volume control, which allows you to apply volume settings and mute all audio streams of a specific audio type. For more information, see “Understanding audio type volume controls.”

This guide now has example source for the afm_ctl utility (afm_ctl.c).

The wave.c and mix_ctl.c examples have been revised.