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pipewire/spa/plugins/bluez5/iso-io.h

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bluez5: add spa_bt_iso_io that does the low-level part for ISO Add factored out helper for ISO socket I/O. ISO sockets need synchronization of writes and audio position for different stream fds in the same isochronous group, and it's easier to separate out the part that coordinates it.
2023-03-25 16:58:27 +02:00
/* Spa Bluez5 ISO I/O */
/* SPDX-FileCopyrightText: Copyright © 2023 Pauli Virtanen */
/* SPDX-License-Identifier: MIT */
#ifndef SPA_BLUEZ5_ISO_IO_H
#define SPA_BLUEZ5_ISO_IO_H
#include <spa/utils/defs.h>
#include <spa/support/loop.h>
#include <spa/support/log.h>
#include <spa/node/io.h>
bluez5: output silence if no data for some ISO sinks When a sink contributing to an ISO CIG does not have data, output silence for it, as long as at least one sink in the CIG is running. Only if writes to sockets fail, pause all streams to reset synchronization. This way we write exactly the same number of packets for each CIS at the same time, which probably is the best tested configuration in BT adapters and devices. We also don't then have to pause output if some sinks are not running or miss their timing, as we generate silence on the fly. When using iso-io, have it initialize the codec instance, and have media-sink uses that instance, so that silence and actual audio are encoded with the same codec.
2023-04-09 21:28:40 +03:00
#include <spa/param/audio/format.h>
struct spa_bt_transport;
bluez5: add spa_bt_iso_io that does the low-level part for ISO Add factored out helper for ISO socket I/O. ISO sockets need synchronization of writes and audio position for different stream fds in the same isochronous group, and it's easier to separate out the part that coordinates it.
2023-03-25 16:58:27 +02:00
/**
* ISO I/O.
*
* Synchronizes related writes from different streams in the same group
* to occur at same real time instant (or not at all).
*/
struct spa_bt_iso_io
{
bluez5: media-sink: resync ISO streams on playback start Resynchronize ISO streams on playback (re)start, so the stream positions are aligned immediately. This is better than relying on rate matching to correct any offsets.
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uint64_t now; /**< Reference time position of next packet (read-only) */
uint64_t duration; /**< ISO interval duration in ns (read-only) */
bool resync; /**< Resync position for next packet; (pull callback sets to
* false when done) */
uint32_t timestamp; /**< Packet timestamp (set by pull callback) */
uint8_t buf[4096]; /**< Packet data (set by pull callback) */
size_t size; /**< Packet size (set by pull callback) */
bluez5: output silence if no data for some ISO sinks When a sink contributing to an ISO CIG does not have data, output silence for it, as long as at least one sink in the CIG is running. Only if writes to sockets fail, pause all streams to reset synchronization. This way we write exactly the same number of packets for each CIS at the same time, which probably is the best tested configuration in BT adapters and devices. We also don't then have to pause output if some sinks are not running or miss their timing, as we generate silence on the fly. When using iso-io, have it initialize the codec instance, and have media-sink uses that instance, so that silence and actual audio are encoded with the same codec.
2023-04-09 21:28:40 +03:00
bool need_resync; /**< Resync requested (set by pull callback) */
struct spa_audio_info format; /**< Audio format */
void *codec_data; /**< Codec data */
bluez5: add spa_bt_iso_io that does the low-level part for ISO Add factored out helper for ISO socket I/O. ISO sockets need synchronization of writes and audio position for different stream fds in the same isochronous group, and it's easier to separate out the part that coordinates it.
2023-03-25 16:58:27 +02:00
void *user_data;
};
typedef void (*spa_bt_iso_io_pull_t)(struct spa_bt_iso_io *io);
bluez5: output silence if no data for some ISO sinks When a sink contributing to an ISO CIG does not have data, output silence for it, as long as at least one sink in the CIG is running. Only if writes to sockets fail, pause all streams to reset synchronization. This way we write exactly the same number of packets for each CIS at the same time, which probably is the best tested configuration in BT adapters and devices. We also don't then have to pause output if some sinks are not running or miss their timing, as we generate silence on the fly. When using iso-io, have it initialize the codec instance, and have media-sink uses that instance, so that silence and actual audio are encoded with the same codec.
2023-04-09 21:28:40 +03:00
struct spa_bt_iso_io *spa_bt_iso_io_create(struct spa_bt_transport *t,
bluez5: iso-io: get BAP interval from dbus, not getsockopt For ISO server sockets, the QOS struct from getsockopt contains values with different meaning from ISO client socket. Get the values via DBus instead, which is right in both cases.
2023-04-06 23:02:44 +03:00
struct spa_log *log, struct spa_loop *data_loop, struct spa_system *data_system);
bluez5: output silence if no data for some ISO sinks When a sink contributing to an ISO CIG does not have data, output silence for it, as long as at least one sink in the CIG is running. Only if writes to sockets fail, pause all streams to reset synchronization. This way we write exactly the same number of packets for each CIS at the same time, which probably is the best tested configuration in BT adapters and devices. We also don't then have to pause output if some sinks are not running or miss their timing, as we generate silence on the fly. When using iso-io, have it initialize the codec instance, and have media-sink uses that instance, so that silence and actual audio are encoded with the same codec.
2023-04-09 21:28:40 +03:00
struct spa_bt_iso_io *spa_bt_iso_io_attach(struct spa_bt_iso_io *io, struct spa_bt_transport *t);
bluez5: add spa_bt_iso_io that does the low-level part for ISO Add factored out helper for ISO socket I/O. ISO sockets need synchronization of writes and audio position for different stream fds in the same isochronous group, and it's easier to separate out the part that coordinates it.
2023-03-25 16:58:27 +02:00
void spa_bt_iso_io_destroy(struct spa_bt_iso_io *io);
void spa_bt_iso_io_set_cb(struct spa_bt_iso_io *io, spa_bt_iso_io_pull_t pull, void *user_data);
#endif
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