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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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components/aes67_tx/include/aes67_tx.h
+3 -1
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@@ -7,8 +7,10 @@
#include "esp_err.h"
// Audio source: fill buf with frames x channels interleaved samples (full scale = INT32_MAX).
// Audio source: fill buf with frames x AES67_TX_SRC_CHANNELS interleaved samples (stereo, full scale =
// INT32_MAX), whatever the stream's channel count: TX maps it (mono stream: L, or (L+R)/2 with mono_sum).
// Return the number of frames delivered; fewer than asked counts as an underrun (padded with silence).
#define AES67_TX_SRC_CHANNELS 2
typedef size_t (*aes67_tx_read_cb_t)(int32_t *buf, size_t frames);
// Registers the "aes67" config group and the TX status fields.