bsncubed
122e46e862
Core: aes67_tx_pink_noise(), a ready-made TX source: xorshift32 white noise through Paul Kellet's pink filter, -18 dBFS RMS (peaks about -6 dBFS), same on L and R. The player uses it like the tone (straight to TX, no volume or gain). Checked on the board: -18 dBFS RMS, octave bands 63 Hz-4 kHz flat within +-0.4 dB, L = R. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
25 lines
1.2 KiB
C
25 lines
1.2 KiB
C
// aes67_tx: RTP sender task, PTP-paced, pull callback; optional mono sum.
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// Core component: must not depend on main/ (project code).
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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#include "esp_err.h"
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// Audio source: fill buf with frames x AES67_TX_SRC_CHANNELS interleaved samples (stereo, full scale =
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// INT32_MAX), whatever the stream's channel count: TX maps it (mono stream: L, or (L+R)/2 with mono_sum).
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// Return the number of frames delivered; fewer than asked counts as an underrun (padded with silence).
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#define AES67_TX_SRC_CHANNELS 2
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typedef size_t (*aes67_tx_read_cb_t)(int32_t *buf, size_t frames);
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// Registers the "aes67" config group and the TX status fields.
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esp_err_t aes67_tx_init(void);
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// Start the sender task. Sends while PTP is locked and aes67.enabled is set.
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esp_err_t aes67_tx_start(void);
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// Set the audio source. NULL = built-in 1 kHz test tone at -18 dBFS, phase-locked to PTP time.
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void aes67_tx_set_source(aes67_tx_read_cb_t read);
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// Ready-made source: pink noise at -18 dBFS RMS (peaks about -6 dBFS), same on L and R.
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// Pass it to aes67_tx_set_source(). Keeps state: use for one stream only.
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size_t aes67_tx_pink_noise(int32_t *buf, size_t frames);
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