Feat:add ext for audio and video frame

[r-wu-ant]

TEST: with moq_demo_audio_server and moq_demo_client

moq/demo/moq_demo_client -n 5

option frame num :5
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:522 (xqc_client_conn_create_notify)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:582 (xqc_client_conn_handshake_finished)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:66 (save_session_cb)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:66 (save_session_cb)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:319 (on_session_setup)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:366 (on_datachannel)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:455 (on_catalog)
track_namespace:namespace track_name:audio track_type:1 codec:opus mime_type:audio/mp4 bitrate:32000 lang:null framerate:0 width:0 height:0 display_width:0 display_height:0 samplerate:48000 channel_config:2
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:384 (on_subscribe)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:378 (on_datachannel_msg)
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:440 (on_subscribe_ok)
subscribe_id:2 expire_ms:0 content_exist:1 largest_group_id:0 largest_object_id:0
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:499 (on_audio_frame)
subscribe_id:2, seq_num:0, timestamp_us:1763152444706786, audio_len:1024, dcid:0f483b07e4219ab3d8af7e5b
audio ext headers: raw_len=15, data=4 test_ext_data
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:499 (on_audio_frame)
subscribe_id:2, seq_num:1, timestamp_us:1763152444746223, audio_len:1024, dcid:0f483b07e4219ab3d8af7e5b
audio ext headers: raw_len=15, data=3 test_ext_data
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:499 (on_audio_frame)
subscribe_id:2, seq_num:2, timestamp_us:1763152444784609, audio_len:1024, dcid:0f483b07e4219ab3d8af7e5b
audio ext headers: raw_len=15, data=2 test_ext_data
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:499 (on_audio_frame)
subscribe_id:2, seq_num:3, timestamp_us:1763152444821691, audio_len:1024, dcid:0f483b07e4219ab3d8af7e5b
audio ext headers: raw_len=15, data=1 test_ext_data
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:499 (on_audio_frame)
subscribe_id:2, seq_num:4, timestamp_us:1763152444861803, audio_len:1024, dcid:0f483b07e4219ab3d8af7e5b
audio ext headers: raw_len=15, data=0 test_ext_data
/src/xquic-ali/moq/demo/xqc_moq_demo_client.c:554 (xqc_client_conn_close_notify)
send_count:16, lost_count:0, lost_dgram_count:0, tlp_count:0, recv_count:26, srtt:9520 early_data_flag:2, conn_err:0, ack_info:#30-29#0-0#0-0#v0429, alpn:moq-quic, fec_recovered:0

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[Copilot]

Pull Request Overview

This PR adds support for extension headers in audio and video frames for the MOQ (Media over QUIC) transport protocol. The feature allows clients to attach custom metadata to media frames that is preserved end-to-end.

Key changes:

• Introduces a new message type XQC_MOQ_MSG_OBJECT_STREAM_EXT (0x30) for objects with extension headers
• Adds ext_headers and ext_headers_len fields to audio/video frame structures
• Implements encode/decode logic for the extended message format with validation and handling of extension headers

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
include/moq/xqc_moq.h	Adds extension header fields to video and audio frame structures, and defines new message type enum
moq/moq_transport/xqc_moq_message.h	Declares encode/decode functions and handler for the extended object stream message type
moq/moq_transport/xqc_moq_message.c	Implements encoding, decoding, creation, and cleanup for extended object stream messages with extension headers
moq/moq_transport/xqc_moq_message_handler.h	Declares handler function for processing extended object stream messages
moq/moq_transport/xqc_moq_message_handler.c	Implements conversion of extended messages to standard object messages for processing
moq/moq_transport/xqc_moq_message_writer.h	Declares writer function for extended object stream messages
moq/moq_transport/xqc_moq_message_writer.c	Implements writer for extended object stream messages
moq/moq_media/xqc_moq_media_track.c	Updates audio/video frame write and read paths to handle extension headers when present
moq/demo/xqc_moq_demo_client.c	Demonstrates sending extension headers with audio frames and displays received extension headers
moq/demo/xqc_moq_audiodemo_server.c	Updates audio frame logging to include extension header length

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