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aes67_tx: mono sum; the source always delivers stereo

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The pull callback's contract said "stream channels", but the player always
delivers stereo, so a 1-channel stream went out as L,R,L,R at half speed.
Sources now always deliver AES67_TX_SRC_CHANNELS (2); TX maps to the stream:
2 ch as is, 1 ch = (L+R)/2 in 64 bit with mono_sum (can't clip), else L.
Checked: mono packets 156 B, 1000/s, 48 samples each, SDP L24/48000/1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-25 23:26:48 +10:00
parent faf427c897
commit c9e06da47c
4 changed files with 22 additions and 5 deletions
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docs/aes67-core-base.md
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@@ -142,7 +142,7 @@ components/
aes67_board/ board pin profiles (waveshare_esp32p4_eth.h, …), eth init
aes67_net/ netif setup, optional VLAN split, DSCP/PCP helpers
aes67_ptp/ PTPv2 ordinary clock: BMCA, servo, master, multicast/hybrid, EMAC HW timestamps, stats
aes67_tx/ RTP sender task, PTP-paced, pull callback: size_t (*read)(int32_t *buf, size_t frames); optional mono sum
aes67_tx/ RTP sender task, PTP-paced, pull callback: size_t (*read)(int32_t *buf, size_t frames), always stereo (AES67_TX_SRC_CHANNELS); TX maps it to the stream (mono: L, or (L+R)/2 with mono_sum)
aes67_sdp_sap/ SDP builder/parser + SAP announcer
aes67_syslog/ remote syslog
aes67_health/ uptime, heap/PSRAM, temperature sensors (temps[] with min/max/warn)