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Add -artp option for audio RTP output

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Add a new -artp command-line option that routes decoded audio to an RTP
stream instead of the local audio sink, following the existing -vrtp
pattern for video.

Usage: uxplay -artp "pt=96 ! udpsink host=127.0.0.1 port=5002"

The implementation:
- Decodes audio (AAC-ELD/ALAC) to PCM
- Converts to S16BE format required by rtpL16pay
- Preserves volume control for iOS volume adjustment
- Sends L16 RTP packets (16-bit signed big-endian, 44100Hz, stereo)
This commit is contained in:
Jacob Pritchett
2026-01-18 00:08:14 -07:00
parent 0133170ff7
commit 6039f53976
5 changed files with 67 additions and 25 deletions
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README.md
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@@ -20,7 +20,9 @@
- option `-vrtp <rest-of-pipeline>` bypasses rendering by UxPlay, and instead
transmits rtp packets of decrypted h264 or h265 video to
an external renderer (e.g. OBS Studio) at an address specified in `rest-of-pipeline`.
(Note: this is video only, an option "-rtp" which muxes audio and video into a mpeg4 container still needs to be created:
Similarly, `-artp <rest-of-pipeline>` forwards decoded audio as L16 RTP packets.
Both options can be used together to forward video and audio (as separate concurrent streams) to external applications.
(Note: an option "-rtp" which muxes audio and video into a mpeg4 container still needs to be created:
Pull Requests welcomed).
- (for Linux/*BSD Desktop Environments using D-Bus). New option `-scrsv <n>` provides screensaver inhibition (e.g., to
@@ -1313,6 +1315,11 @@ Uses rtph264pay or rtph265pay as appropriate: *pipeline* should start with any
rtph26xpay options (such as config_interval= or aggregate-mode =), followed by
a sending method: *e.g.*, `"config-interval=1 ! udpsink host=127.0.0.1 port=5000`".
**-artp *pipeline***: forward decoded audio as L16 RTP packets to somewhere else, without local playback.
Uses rtpL16pay (16-bit signed big-endian PCM, 44100Hz stereo): *pipeline* should start with any
rtpL16pay options (such as pt=), followed by a sending method:
*e.g.*, `"pt=96 ! udpsink host=127.0.0.1 port=5002"`. iOS volume control still works over RTP.
**-v4l2** Video settings for hardware h264 video decoding in the GPU by
Video4Linux2. Equivalent to `-vd v4l2h264dec -vc v4l2convert`.