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milan-avb: add AVDECC stream_format decoder in aecp-aem.h

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hackerman-kl 2026-04-26 14:55:25 +02:00 • committed by Wim Taymans
parent d9f8bacc76
commit a5fbeef6f8
1 changed files with 74 additions and 0 deletions
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74
src/modules/module-avb/aecp-aem.h
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@ -6,8 +6,82 @@
#ifndef AVB_AEM_H
#define AVB_AEM_H
#include <endian.h>
#include <stdbool.h>
#include <stdint.h>
#include "aecp.h"
#include "aecp-aem-types.h"
#include "packets.h"
/* AVDECC stream_format decoder.
*
* The 64-bit stream_format field carried in STREAM_INPUT/STREAM_OUTPUT
* descriptors and in SET/GET_STREAM_FORMAT is encoded per IEEE 1722-2016
* Section 7.3.x / Annex H — the high byte is the AVTP subtype, the lower 56 bits
* are subtype-specific. This struct exposes the subset needed by the data
* plane plus an `is_audio` shortcut so callers can skip non-media streams
* (CRF). Fields are 0 when not applicable.
*
* NOTE: bit-level decoding inside each subtype is incomplete. Today the
* decoder identifies the subtype reliably and falls back to the historical
* 8 ch / 48 kHz / 24-bit defaults for audio — sufficient for current Milan
* builds where every stream_input_0 / stream_output_0 uses one of those
* formats. TODO Section H.1 (AAF) and Section F (IEC 61883-6 AM824) fields once a real
* conformance run needs other rates / channel counts. */
enum avb_aem_stream_format_kind {
AVB_AEM_STREAM_FORMAT_KIND_UNKNOWN = 0,
AVB_AEM_STREAM_FORMAT_KIND_AAF,
AVB_AEM_STREAM_FORMAT_KIND_IEC_61883_6,
AVB_AEM_STREAM_FORMAT_KIND_CRF,
};
struct avb_aem_stream_format_info {
uint8_t subtype;
enum avb_aem_stream_format_kind kind;
bool is_audio;
uint32_t rate;
uint16_t channels;
uint8_t bit_depth;
uint16_t samples_per_frame;
};
static inline void avb_aem_stream_format_decode(uint64_t fmt_be,
struct avb_aem_stream_format_info *out)
{
uint64_t f = be64toh(fmt_be);
out->subtype = (uint8_t)((f >> 56) & 0xFF);
out->kind = AVB_AEM_STREAM_FORMAT_KIND_UNKNOWN;
out->is_audio = false;
out->rate = 0;
out->channels = 0;
out->bit_depth = 0;
out->samples_per_frame = 0;
switch (out->subtype) {
case AVB_SUBTYPE_AAF:
out->kind = AVB_AEM_STREAM_FORMAT_KIND_AAF;
out->is_audio = true;
out->rate = 48000;
out->channels = 8;
out->bit_depth = 24;
out->samples_per_frame = 6;
break;
case AVB_SUBTYPE_61883_IIDC:
out->kind = AVB_AEM_STREAM_FORMAT_KIND_IEC_61883_6;
out->is_audio = true;
out->rate = 48000;
out->channels = 8;
out->bit_depth = 24;
out->samples_per_frame = 6;
break;
case AVB_SUBTYPE_CRF:
out->kind = AVB_AEM_STREAM_FORMAT_KIND_CRF;
break;
default:
break;
}
}
struct avb_packet_aecp_aem_acquire {
uint32_t flags;