mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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589bc4b6f4
Align RX of streams in same ISO group: - Ensure all streams in ISO group have same target latency also for BAP Client - Determine rate matching to ISO group clock from RX times of all streams in the group - Based on this, compute nominal packet RX times, and feed them to decode-buffer instead of the real RX time. This is enough for sub-sample level sync. - Customise buffer overrun handling for ISO so that it drops data to arrive exactly at the target, for faster convergence at RX start The ISO clock matching is done based on kernel-provided packet RX times, so it has unknown offset from the actual ISO clock, probably a few ms. Current kernels (6.17) do not provide anything better to use for the clock matching, and doing it properly appears to be controller vendor-defined (if possible at all).
55 lines
2 KiB
C
55 lines
2 KiB
C
/* Spa Bluez5 ISO I/O */
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/* SPDX-FileCopyrightText: Copyright © 2023 Pauli Virtanen */
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/* SPDX-License-Identifier: MIT */
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#ifndef SPA_BLUEZ5_ISO_IO_H
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#define SPA_BLUEZ5_ISO_IO_H
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#include <spa/utils/defs.h>
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#include <spa/support/loop.h>
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#include <spa/support/log.h>
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#include <spa/node/io.h>
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#include <spa/param/audio/format.h>
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struct spa_bt_decode_buffer;
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struct spa_bt_transport;
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/**
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* ISO I/O.
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*
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* Synchronizes related writes from different streams in the same group
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* to occur at same real time instant (or not at all).
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*/
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struct spa_bt_iso_io
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{
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uint64_t now; /**< Reference time position of next packet (read-only) */
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uint64_t duration; /**< ISO interval duration in ns (read-only) */
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bool resync; /**< Resync position for next packet; (pull callback sets to
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* false when done) */
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uint32_t timestamp; /**< Packet timestamp (set by pull callback) */
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uint8_t buf[4096]; /**< Packet data (set by pull callback) */
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size_t size; /**< Packet size (set by pull callback) */
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bool need_resync; /**< Resync requested (set by pull callback) */
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struct spa_audio_info format; /**< Audio format */
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void *codec_data; /**< Codec data */
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void *user_data;
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};
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typedef void (*spa_bt_iso_io_pull_t)(struct spa_bt_iso_io *io);
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struct spa_bt_iso_io *spa_bt_iso_io_create(struct spa_bt_transport *t,
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struct spa_log *log, struct spa_loop *data_loop, struct spa_system *data_system);
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struct spa_bt_iso_io *spa_bt_iso_io_attach(struct spa_bt_iso_io *io, struct spa_bt_transport *t);
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void spa_bt_iso_io_destroy(struct spa_bt_iso_io *io);
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void spa_bt_iso_io_set_cb(struct spa_bt_iso_io *io, spa_bt_iso_io_pull_t pull, void *user_data);
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int spa_bt_iso_io_recv_errqueue(struct spa_bt_iso_io *io);
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void spa_bt_iso_io_set_source_buffer(struct spa_bt_iso_io *io, struct spa_bt_decode_buffer *buffer);
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int32_t spa_bt_iso_io_get_source_target_latency(struct spa_bt_iso_io *io);
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void spa_bt_iso_io_check_rx_sync(struct spa_bt_iso_io *io, uint64_t position);
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int64_t spa_bt_iso_io_recv(struct spa_bt_iso_io *io, int64_t now);
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#endif
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