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-rw-r--r--spa/plugins/bluez5/midi-node.c2151
1 files changed, 2151 insertions, 0 deletions
diff --git a/spa/plugins/bluez5/midi-node.c b/spa/plugins/bluez5/midi-node.c
new file mode 100644
index 0000000..c6a7e46
--- /dev/null
+++ b/spa/plugins/bluez5/midi-node.c
@@ -0,0 +1,2151 @@
+/* Spa MIDI node
+ *
+ * Copyright © 2022 Pauli Virtanen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <unistd.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/loop.h>
+#include <spa/support/log.h>
+#include <spa/support/system.h>
+#include <spa/utils/list.h>
+#include <spa/utils/keys.h>
+#include <spa/utils/names.h>
+#include <spa/utils/string.h>
+#include <spa/utils/result.h>
+#include <spa/utils/dll.h>
+#include <spa/utils/ringbuffer.h>
+#include <spa/monitor/device.h>
+#include <spa/control/control.h>
+
+#include <spa/node/node.h>
+#include <spa/node/utils.h>
+#include <spa/node/io.h>
+#include <spa/node/keys.h>
+#include <spa/param/param.h>
+#include <spa/param/latency-utils.h>
+#include <spa/param/audio/format.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/pod/filter.h>
+
+#include <spa/debug/mem.h>
+#include <spa/debug/log.h>
+
+#include "midi.h"
+
+#include "bluez5-interface-gen.h"
+
+static struct spa_log_topic log_topic = SPA_LOG_TOPIC(0, "spa.bluez5.midi.node");
+#undef SPA_LOG_TOPIC_DEFAULT
+#define SPA_LOG_TOPIC_DEFAULT &log_topic
+
+#define DEFAULT_CLOCK_NAME "clock.system.monotonic"
+
+#define DLL_BW 0.05
+
+#define DEFAULT_LATENCY_OFFSET (0 * SPA_NSEC_PER_MSEC)
+
+#define MAX_BUFFERS 32
+
+#define MIDI_RINGBUF_SIZE (8192*4)
+
+enum node_role {
+ NODE_SERVER,
+ NODE_CLIENT,
+};
+
+struct props {
+ char clock_name[64];
+ char device_name[512];
+ int64_t latency_offset;
+};
+
+struct midi_event_ringbuffer_entry {
+ uint64_t time;
+ unsigned int size;
+};
+
+struct midi_event_ringbuffer {
+ struct spa_ringbuffer rbuf;
+ uint8_t buf[MIDI_RINGBUF_SIZE];
+};
+
+struct buffer {
+ uint32_t id;
+ unsigned int outgoing:1;
+ struct spa_buffer *buf;
+ struct spa_meta_header *h;
+ struct spa_list link;
+};
+
+struct time_sync {
+ uint64_t prev_recv_time;
+ uint64_t recv_time;
+
+ uint16_t prev_device_timestamp;
+ uint16_t device_timestamp;
+
+ uint64_t device_time;
+
+ struct spa_dll dll;
+};
+
+struct port {
+ uint32_t id;
+ enum spa_direction direction;
+
+ struct spa_audio_info current_format;
+ unsigned int have_format:1;
+
+ uint64_t info_all;
+ struct spa_port_info info;
+ struct spa_io_buffers *io;
+ struct spa_latency_info latency;
+#define IDX_EnumFormat 0
+#define IDX_Meta 1
+#define IDX_IO 2
+#define IDX_Format 3
+#define IDX_Buffers 4
+#define IDX_Latency 5
+#define N_PORT_PARAMS 6
+ struct spa_param_info params[N_PORT_PARAMS];
+
+ struct buffer buffers[MAX_BUFFERS];
+ uint32_t n_buffers;
+
+ struct spa_list free;
+ struct spa_list ready;
+
+ int fd;
+ uint16_t mtu;
+
+ struct buffer *buffer;
+ struct spa_pod_builder builder;
+ struct spa_pod_frame frame;
+
+ struct time_sync sync;
+
+ unsigned int acquired:1;
+ GCancellable *acquire_call;
+
+ struct spa_source source;
+
+ struct impl *impl;
+};
+
+struct impl {
+ struct spa_handle handle;
+ struct spa_node node;
+
+ struct spa_log *log;
+ struct spa_loop *main_loop;
+ struct spa_loop *data_loop;
+ struct spa_system *data_system;
+
+ GDBusConnection *conn;
+ Bluez5GattCharacteristic1 *proxy;
+
+ struct spa_hook_list hooks;
+ struct spa_callbacks callbacks;
+
+ uint64_t info_all;
+ struct spa_node_info info;
+#define IDX_PropInfo 0
+#define IDX_Props 1
+#define IDX_NODE_IO 2
+#define N_NODE_PARAMS 3
+ struct spa_param_info params[N_NODE_PARAMS];
+ struct props props;
+
+#define PORT_IN 0
+#define PORT_OUT 1
+#define N_PORTS 2
+ struct port ports[N_PORTS];
+
+ char *chr_path;
+
+ unsigned int started:1;
+ unsigned int following:1;
+
+ struct spa_source timer_source;
+
+ int timerfd;
+
+ struct spa_io_clock *clock;
+ struct spa_io_position *position;
+
+ uint32_t duration;
+ uint32_t rate;
+
+ uint64_t current_time;
+ uint64_t next_time;
+
+ struct midi_event_ringbuffer event_rbuf;
+
+ struct spa_bt_midi_parser parser;
+ struct spa_bt_midi_parser tmp_parser;
+ uint8_t read_buffer[MIDI_MAX_MTU];
+
+ struct spa_bt_midi_writer writer;
+
+ enum node_role role;
+
+ struct spa_bt_midi_server *server;
+};
+
+#define CHECK_PORT(this,d,p) ((p) == 0 && ((d) == SPA_DIRECTION_INPUT || (d) == SPA_DIRECTION_OUTPUT))
+#define GET_PORT(this,d,p) (&(this)->ports[(d) == SPA_DIRECTION_OUTPUT ? PORT_OUT : PORT_IN])
+
+static void midi_event_ringbuffer_init(struct midi_event_ringbuffer *mbuf)
+{
+ spa_ringbuffer_init(&mbuf->rbuf);
+}
+
+static int midi_event_ringbuffer_push(struct midi_event_ringbuffer *mbuf,
+ uint64_t time, uint8_t *event, unsigned int size)
+{
+ const unsigned int bufsize = sizeof(mbuf->buf);
+ int32_t avail;
+ uint32_t index;
+ struct midi_event_ringbuffer_entry evt = {
+ .time = time,
+ .size = size
+ };
+
+ avail = spa_ringbuffer_get_write_index(&mbuf->rbuf, &index);
+ if (avail < 0 || avail + sizeof(evt) + size > bufsize)
+ return -ENOSPC;
+
+ spa_ringbuffer_write_data(&mbuf->rbuf, mbuf->buf, bufsize, index % bufsize,
+ &evt, sizeof(evt));
+ index += sizeof(evt);
+ spa_ringbuffer_write_update(&mbuf->rbuf, index);
+ spa_ringbuffer_write_data(&mbuf->rbuf, mbuf->buf, bufsize, index % bufsize,
+ event, size);
+ index += size;
+ spa_ringbuffer_write_update(&mbuf->rbuf, index);
+
+ return 0;
+}
+
+static int midi_event_ringbuffer_peek(struct midi_event_ringbuffer *mbuf, uint64_t *time, unsigned int *size)
+{
+ const unsigned bufsize = sizeof(mbuf->buf);
+ int32_t avail;
+ uint32_t index;
+ struct midi_event_ringbuffer_entry evt;
+
+ avail = spa_ringbuffer_get_read_index(&mbuf->rbuf, &index);
+ if (avail < (int)sizeof(evt))
+ return -ENOENT;
+
+ spa_ringbuffer_read_data(&mbuf->rbuf, mbuf->buf, bufsize, index % bufsize,
+ &evt, sizeof(evt));
+
+ *time = evt.time;
+ *size = evt.size;
+ return 0;
+}
+
+static int midi_event_ringbuffer_pop(struct midi_event_ringbuffer *mbuf, uint8_t *data, size_t max_size)
+{
+ const unsigned bufsize = sizeof(mbuf->buf);
+ int32_t avail;
+ uint32_t index;
+ struct midi_event_ringbuffer_entry evt;
+
+ avail = spa_ringbuffer_get_read_index(&mbuf->rbuf, &index);
+ if (avail < (int)sizeof(evt))
+ return -ENOENT;
+
+ spa_ringbuffer_read_data(&mbuf->rbuf, mbuf->buf, bufsize, index % bufsize,
+ &evt, sizeof(evt));
+ index += sizeof(evt);
+ avail -= sizeof(evt);
+ spa_ringbuffer_read_update(&mbuf->rbuf, index);
+
+ if ((uint32_t)avail < evt.size) {
+ /* corrupted ringbuffer: should never happen */
+ spa_assert_not_reached();
+ return -EINVAL;
+ }
+
+ if (evt.size <= max_size)
+ spa_ringbuffer_read_data(&mbuf->rbuf, mbuf->buf, bufsize, index % bufsize,
+ data, SPA_MIN(max_size, evt.size));
+ index += evt.size;
+ spa_ringbuffer_read_update(&mbuf->rbuf, index);
+
+ if (evt.size > max_size)
+ return -ENOSPC;
+
+ return 0;
+}
+
+static void reset_props(struct props *props)
+{
+ props->latency_offset = DEFAULT_LATENCY_OFFSET;
+ strncpy(props->clock_name, DEFAULT_CLOCK_NAME, sizeof(props->clock_name));
+ props->device_name[0] = '\0';
+}
+
+static bool is_following(struct impl *this)
+{
+ return this->position && this->clock && this->position->clock.id != this->clock->id;
+}
+
+static int set_timeout(struct impl *this, uint64_t time)
+{
+ struct itimerspec ts;
+ ts.it_value.tv_sec = time / SPA_NSEC_PER_SEC;
+ ts.it_value.tv_nsec = time % SPA_NSEC_PER_SEC;
+ ts.it_interval.tv_sec = 0;
+ ts.it_interval.tv_nsec = 0;
+ return spa_system_timerfd_settime(this->data_system,
+ this->timerfd, SPA_FD_TIMER_ABSTIME, &ts, NULL);
+}
+
+static int set_timers(struct impl *this)
+{
+ struct timespec now;
+
+ spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now);
+ this->next_time = SPA_TIMESPEC_TO_NSEC(&now);
+
+ return set_timeout(this, this->following ? 0 : this->next_time);
+}
+
+static void recycle_buffer(struct impl *this, struct port *port, uint32_t buffer_id)
+{
+ struct buffer *b = &port->buffers[buffer_id];
+
+ if (b->outgoing) {
+ spa_log_trace(this->log, "%p: recycle buffer %u", this, buffer_id);
+ spa_list_append(&port->free, &b->link);
+ b->outgoing = false;
+ }
+}
+
+static int clear_buffers(struct impl *this, struct port *port)
+{
+ if (port->n_buffers > 0) {
+ spa_list_init(&port->free);
+ spa_list_init(&port->ready);
+ port->n_buffers = 0;
+ }
+ return 0;
+}
+
+static void reset_buffers(struct port *port)
+{
+ uint32_t i;
+
+ spa_list_init(&port->free);
+ spa_list_init(&port->ready);
+
+ for (i = 0; i < port->n_buffers; i++) {
+ struct buffer *b = &port->buffers[i];
+
+ if (port->direction == SPA_DIRECTION_OUTPUT) {
+ spa_list_append(&port->free, &b->link);
+ b->outgoing = false;
+ } else {
+ b->outgoing = true;
+ }
+ }
+}
+
+static struct buffer *peek_buffer(struct impl *this, struct port *port)
+{
+ if (spa_list_is_empty(&port->free))
+ return NULL;
+ return spa_list_first(&port->free, struct buffer, link);
+}
+
+static int prepare_buffer(struct impl *this, struct port *port)
+{
+ if (port->buffer != NULL)
+ return 0;
+ if ((port->buffer = peek_buffer(this, port)) == NULL)
+ return -EPIPE;
+
+ spa_pod_builder_init(&port->builder,
+ port->buffer->buf->datas[0].data,
+ port->buffer->buf->datas[0].maxsize);
+ spa_pod_builder_push_sequence(&port->builder, &port->frame, 0);
+
+ return 0;
+}
+
+static int finish_buffer(struct impl *this, struct port *port)
+{
+ if (port->buffer == NULL)
+ return 0;
+
+ spa_pod_builder_pop(&port->builder, &port->frame);
+
+ port->buffer->buf->datas[0].chunk->offset = 0;
+ port->buffer->buf->datas[0].chunk->size = port->builder.state.offset;
+
+ /* move buffer to ready queue */
+ spa_list_remove(&port->buffer->link);
+ spa_list_append(&port->ready, &port->buffer->link);
+ port->buffer = NULL;
+
+ return 0;
+}
+
+/* Replace value -> value + n*period, to minimize |value - target| */
+static int64_t unwrap_to_closest(int64_t value, int64_t target, int64_t period)
+{
+ if (value > target)
+ value -= SPA_ROUND_DOWN(value - target + period/2, period);
+ if (value < target)
+ value += SPA_ROUND_DOWN(target - value + period/2, period);
+ return value;
+}
+
+static int64_t time_diff(uint64_t a, uint64_t b)
+{
+ if (a >= b)
+ return a - b;
+ else
+ return -(int64_t)(b - a);
+}
+
+static void midi_event_get_last_timestamp(void *user_data, uint16_t timestamp, uint8_t *data, size_t size)
+{
+ int *last_timestamp = user_data;
+ *last_timestamp = timestamp;
+}
+
+static uint64_t midi_convert_time(struct time_sync *sync, uint16_t timestamp)
+{
+ int offset;
+
+ /*
+ * sync->device_timestamp is a device timestamp that corresponds to system
+ * clock time sync->device_time.
+ *
+ * It is the timestamp of the last MIDI event in the current packet, so we can
+ * assume here no event here has timestamp after it.
+ */
+ if (timestamp > sync->device_timestamp)
+ offset = sync->device_timestamp + MIDI_CLOCK_PERIOD_MSEC - timestamp;
+ else
+ offset = sync->device_timestamp - timestamp;
+
+ return sync->device_time - offset * SPA_NSEC_PER_MSEC;
+}
+
+static void midi_event_recv(void *user_data, uint16_t timestamp, uint8_t *data, size_t size)
+{
+ struct impl *this = user_data;
+ struct port *port = &this->ports[PORT_OUT];
+ struct time_sync *sync = &port->sync;
+ uint64_t time;
+ int res;
+
+ spa_assert(size > 0);
+
+ time = midi_convert_time(sync, timestamp);
+
+ spa_log_trace(this->log, "%p: event:0x%x size:%d timestamp:%d time:%"PRIu64"",
+ this, (int)data[0], (int)size, (int)timestamp, (uint64_t)time);
+
+ res = midi_event_ringbuffer_push(&this->event_rbuf, time, data, size);
+ if (res < 0) {
+ midi_event_ringbuffer_init(&this->event_rbuf);
+ spa_log_warn(this->log, "%p: MIDI receive buffer overflow: %s",
+ this, spa_strerror(res));
+ }
+}
+
+static int unacquire_port(struct port *port)
+{
+ struct impl *this = port->impl;
+
+ if (!port->acquired)
+ return 0;
+
+ spa_log_debug(this->log, "%p: unacquire port:%d", this, port->direction);
+
+ shutdown(port->fd, SHUT_RDWR);
+ close(port->fd);
+ port->fd = -1;
+ port->acquired = false;
+
+ if (this->server)
+ spa_bt_midi_server_released(this->server,
+ (port->direction == SPA_DIRECTION_OUTPUT));
+
+ return 0;
+}
+
+static int do_unacquire_port(struct spa_loop *loop, bool async, uint32_t seq,
+ const void *data, size_t size, void *user_data)
+{
+ struct port *port = user_data;
+
+ /* in main thread */
+ unacquire_port(port);
+ return 0;
+}
+
+static void on_ready_read(struct spa_source *source)
+{
+ struct port *port = source->data;
+ struct impl *this = port->impl;
+ struct timespec now;
+ int res, size, last_timestamp;
+
+ if (SPA_FLAG_IS_SET(source->rmask, SPA_IO_ERR) ||
+ SPA_FLAG_IS_SET(source->rmask, SPA_IO_HUP)) {
+ spa_log_debug(this->log, "%p: port:%d ERR/HUP", this, port->direction);
+ goto stop;
+ }
+
+ spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now);
+
+ /* read data from socket */
+again:
+ size = recv(port->fd, this->read_buffer, sizeof(this->read_buffer), MSG_DONTWAIT | MSG_NOSIGNAL);
+ if (size == 0) {
+ return;
+ } else if (size < 0) {
+ if (errno == EINTR)
+ goto again;
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ return;
+ goto stop;
+ }
+
+ spa_log_trace(this->log, "%p: port:%d recv data size:%d", this, port->direction, size);
+ spa_debug_log_mem(this->log, SPA_LOG_LEVEL_TRACE, 4, this->read_buffer, size);
+
+ if (port->direction != SPA_DIRECTION_OUTPUT) {
+ /* Just monitor errors for the input port */
+ spa_log_debug(this->log, "%p: port:%d is not RX port; ignoring data",
+ this, port->direction);
+ return;
+ }
+
+ /* prepare for producing events */
+ if (port->io == NULL || port->n_buffers == 0 || !this->started)
+ return;
+
+ /*
+ * Remote clock synchronization:
+ *
+ * Assume: Last timestamp in packet on average corresponds to packet send time.
+ * There is some unknown latency in between, but on average it is constant.
+ *
+ * The `device_time` computed below is the estimated wall-clock time
+ * corresponding to the timestamp `device_timestamp` of the last event
+ * in the packet. This timestamp is late by the average transmission latency,
+ * which is unknown.
+ *
+ * Packet reception jitter and any clock drift is smoothed over with DLL.
+ * The estimated timestamps are stable and preserve event intervals.
+ *
+ * To allow latency_offset to work better, we don't write the events
+ * to the output buffer here, but instead put them to a ringbuffer.
+ * This is because if the offset shifts events to later buffers,
+ * this is simpler to handle with the rbuf.
+ */
+ last_timestamp = -1;
+ spa_bt_midi_parser_dup(&this->parser, &this->tmp_parser, true);
+ res = spa_bt_midi_parser_parse(&this->tmp_parser, this->read_buffer, size, true,
+ midi_event_get_last_timestamp, &last_timestamp);
+ if (res >= 0 && last_timestamp >= 0) {
+ struct time_sync *sync = &port->sync;
+ int64_t clock_elapsed;
+ int64_t device_elapsed;
+ int64_t err_nsec;
+ double corr, tcorr;
+
+ sync->prev_recv_time = sync->recv_time;
+ sync->recv_time = SPA_TIMESPEC_TO_NSEC(&now);
+
+ sync->prev_device_timestamp = sync->device_timestamp;
+ sync->device_timestamp = last_timestamp;
+
+ if (port->sync.prev_recv_time == 0) {
+ sync->prev_recv_time = sync->recv_time;
+ sync->prev_device_timestamp = sync->device_timestamp;
+ spa_dll_init(&sync->dll);
+ }
+ if (SPA_UNLIKELY(sync->dll.bw == 0))
+ spa_dll_set_bw(&sync->dll, DLL_BW, 1024, 48000);
+
+ /* move device clock forward */
+ clock_elapsed = sync->recv_time - sync->prev_recv_time;
+
+ device_elapsed = (int)sync->device_timestamp - (int)sync->prev_device_timestamp;
+ device_elapsed *= SPA_NSEC_PER_MSEC;
+ device_elapsed = unwrap_to_closest(device_elapsed, clock_elapsed, MIDI_CLOCK_PERIOD_NSEC);
+ sync->device_time += device_elapsed;
+
+ /* smooth clock sync */
+ err_nsec = time_diff(sync->recv_time, sync->device_time);
+ corr = spa_dll_update(&sync->dll,
+ -SPA_CLAMP(err_nsec, -20*SPA_NSEC_PER_MSEC, 20*SPA_NSEC_PER_MSEC)
+ * this->rate / SPA_NSEC_PER_SEC);
+ tcorr = SPA_MIN(device_elapsed, SPA_NSEC_PER_SEC) * (corr - 1);
+ sync->device_time += tcorr;
+
+ /* reset if too much off */
+ if (err_nsec < -50 * SPA_NSEC_PER_MSEC ||
+ err_nsec > 200 * SPA_NSEC_PER_MSEC ||
+ SPA_ABS(tcorr) > 20*SPA_NSEC_PER_MSEC ||
+ device_elapsed < 0) {
+ spa_log_debug(this->log, "%p: device clock sync off too much: resync", this);
+ spa_dll_init(&sync->dll);
+ sync->device_time = sync->recv_time;
+ }
+
+ spa_log_debug(this->log,
+ "timestamp:%d dt:%d dt2:%d err:%.1f tcorr:%.2f (ms) corr:%f",
+ (int)sync->device_timestamp,
+ (int)(clock_elapsed/SPA_NSEC_PER_MSEC),
+ (int)(device_elapsed/SPA_NSEC_PER_MSEC),
+ (double)err_nsec / SPA_NSEC_PER_MSEC,
+ tcorr/SPA_NSEC_PER_MSEC,
+ corr);
+ }
+
+ /* put midi event data to the buffer */
+ res = spa_bt_midi_parser_parse(&this->parser, this->read_buffer, size, false,
+ midi_event_recv, this);
+ if (res < 0) {
+ /* bad data */
+ spa_bt_midi_parser_init(&this->parser);
+
+ spa_log_info(this->log, "BLE MIDI data packet parsing failed: %d", res);
+ spa_debug_log_mem(this->log, SPA_LOG_LEVEL_DEBUG, 4, this->read_buffer, size);
+ }
+
+ return;
+
+stop:
+ spa_log_debug(this->log, "%p: port:%d stopping port", this, port->direction);
+
+ if (port->source.loop)
+ spa_loop_remove_source(this->data_loop, &port->source);
+
+ /* port->acquired is updated only from the main thread */
+ spa_loop_invoke(this->main_loop, do_unacquire_port, 0, NULL, 0, false, port);
+}
+
+static int process_output(struct impl *this)
+{
+ struct port *port = &this->ports[PORT_OUT];
+ struct buffer *buffer;
+ struct spa_io_buffers *io = port->io;
+
+ /* Check if we are able to process */
+ if (io == NULL || !port->acquired)
+ return SPA_STATUS_OK;
+
+ /* Return if we already have a buffer */
+ if (io->status == SPA_STATUS_HAVE_DATA)
+ return SPA_STATUS_HAVE_DATA;
+
+ /* Recycle */
+ if (io->buffer_id < port->n_buffers) {
+ recycle_buffer(this, port, io->buffer_id);
+ io->buffer_id = SPA_ID_INVALID;
+ }
+
+ /* Produce buffer */
+ if (prepare_buffer(this, port) >= 0) {
+ /*
+ * this->current_time is at the end time of the buffer, and offsets
+ * are recorded vs. the start of the buffer.
+ */
+ const uint64_t start_time = this->current_time
+ - this->duration * SPA_NSEC_PER_SEC / this->rate;
+ const uint64_t end_time = this->current_time;
+ uint64_t time;
+ uint32_t offset;
+ void *buf;
+ unsigned int size;
+ int res;
+
+ while (true) {
+ res = midi_event_ringbuffer_peek(&this->event_rbuf, &time, &size);
+ if (res < 0)
+ break;
+
+ time -= this->props.latency_offset;
+
+ if (time > end_time) {
+ break;
+ } else if (time + SPA_NSEC_PER_MSEC < start_time) {
+ /* Log events in the past by more than 1 ms, but don't
+ * do anything about them. The user can change the latency
+ * offset to choose whether to tradeoff latency for more
+ * accurate timestamps.
+ *
+ * TODO: maybe this information should be available in
+ * a more visible place, some latency property?
+ */
+ spa_log_debug(this->log, "%p: event in the past by %d ms",
+ this, (int)((start_time - time) / SPA_NSEC_PER_MSEC));
+ }
+
+ time = SPA_MAX(time, start_time) - start_time;
+ offset = time * this->rate / SPA_NSEC_PER_SEC;
+ offset = SPA_CLAMP(offset, 0u, this->duration - 1);
+
+ spa_pod_builder_control(&port->builder, offset, SPA_CONTROL_Midi);
+ buf = spa_pod_builder_reserve_bytes(&port->builder, size);
+ if (buf) {
+ midi_event_ringbuffer_pop(&this->event_rbuf, buf, size);
+
+ spa_log_trace(this->log, "%p: produce event:0x%x offset:%d time:%"PRIu64"",
+ this, (int)*(uint8_t*)buf, (int)offset,
+ (uint64_t)(start_time + offset * SPA_NSEC_PER_SEC / this->rate));
+ }
+ }
+
+ finish_buffer(this, port);
+ }
+
+ /* Return if there are no buffers ready to be processed */
+ if (spa_list_is_empty(&port->ready))
+ return SPA_STATUS_OK;
+
+ /* Get the new buffer from the ready list */
+ buffer = spa_list_first(&port->ready, struct buffer, link);
+ spa_list_remove(&buffer->link);
+ buffer->outgoing = true;
+
+ /* Set the new buffer in IO */
+ io->buffer_id = buffer->id;
+ io->status = SPA_STATUS_HAVE_DATA;
+
+ /* Notify we have a buffer ready to be processed */
+ return SPA_STATUS_HAVE_DATA;
+}
+
+static int flush_packet(struct impl *this)
+{
+ struct port *port = &this->ports[PORT_IN];
+ int res;
+
+ if (this->writer.size == 0)
+ return 0;
+
+ res = send(port->fd, this->writer.buf, this->writer.size,
+ MSG_DONTWAIT | MSG_NOSIGNAL);
+ if (res < 0)
+ return -errno;
+
+ spa_log_trace(this->log, "%p: send packet size:%d", this, this->writer.size);
+ spa_debug_log_mem(this->log, SPA_LOG_LEVEL_TRACE, 4, this->writer.buf, this->writer.size);
+
+ return 0;
+}
+
+static int write_data(struct impl *this, struct spa_data *d)
+{
+ struct port *port = &this->ports[PORT_IN];
+ struct spa_pod_sequence *pod;
+ struct spa_pod_control *c;
+ uint64_t time;
+ int res;
+
+ pod = spa_pod_from_data(d->data, d->maxsize, d->chunk->offset, d->chunk->size);
+ if (pod == NULL) {
+ spa_log_warn(this->log, "%p: invalid sequence in buffer max:%u offset:%u size:%u",
+ this, d->maxsize, d->chunk->offset, d->chunk->size);
+ return -EINVAL;
+ }
+
+ spa_bt_midi_writer_init(&this->writer, port->mtu);
+ time = 0;
+
+ SPA_POD_SEQUENCE_FOREACH(pod, c) {
+ uint8_t *event;
+ size_t size;
+
+ if (c->type != SPA_CONTROL_Midi)
+ continue;
+
+ time = SPA_MAX(time, this->current_time + c->offset * SPA_NSEC_PER_SEC / this->rate);
+ event = SPA_POD_BODY(&c->value);
+ size = SPA_POD_BODY_SIZE(&c->value);
+
+ spa_log_trace(this->log, "%p: output event:0x%x time:%"PRIu64, this,
+ (size > 0) ? event[0] : 0, time);
+
+ do {
+ res = spa_bt_midi_writer_write(&this->writer,
+ time, event, size);
+ if (res < 0) {
+ return res;
+ } else if (res) {
+ int res2;
+ if ((res2 = flush_packet(this)) < 0)
+ return res2;
+ }
+ } while (res);
+ }
+
+ if ((res = flush_packet(this)) < 0)
+ return res;
+
+ return 0;
+}
+
+static int process_input(struct impl *this)
+{
+ struct port *port = &this->ports[PORT_IN];
+ struct buffer *b;
+ struct spa_io_buffers *io = port->io;
+ int res;
+
+ /* Check if we are able to process */
+ if (io == NULL || !port->acquired)
+ return SPA_STATUS_OK;
+
+ if (io->status != SPA_STATUS_HAVE_DATA || io->buffer_id >= port->n_buffers)
+ return SPA_STATUS_OK;
+
+ b = &port->buffers[io->buffer_id];
+ if (!b->outgoing) {
+ spa_log_warn(this->log, "%p: buffer %u not outgoing", this, io->buffer_id);
+ io->status = -EINVAL;
+ return -EINVAL;
+ }
+
+ if ((res = write_data(this, &b->buf->datas[0])) < 0) {
+ spa_log_info(this->log, "%p: writing data failed: %s",
+ this, spa_strerror(res));
+ }
+
+ port->io->buffer_id = b->id;
+ io->status = SPA_STATUS_NEED_DATA;
+ spa_node_call_reuse_buffer(&this->callbacks, 0, io->buffer_id);
+
+ return SPA_STATUS_HAVE_DATA;
+}
+
+static void update_position(struct impl *this)
+{
+ if (SPA_LIKELY(this->position)) {
+ this->duration = this->position->clock.duration;
+ this->rate = this->position->clock.rate.denom;
+ } else {
+ this->duration = 1024;
+ this->rate = 48000;
+ }
+}
+
+static void on_timeout(struct spa_source *source)
+{
+ struct impl *this = source->data;
+ uint64_t exp;
+ uint64_t prev_time, now_time;
+ int status;
+
+ if (!this->started)
+ return;
+
+ if (spa_system_timerfd_read(this->data_system, this->timerfd, &exp) < 0)
+ spa_log_warn(this->log, "%p: error reading timerfd: %s", this, strerror(errno));
+
+ prev_time = this->current_time;
+ now_time = this->current_time = this->next_time;
+
+ spa_log_trace(this->log, "%p: timer %"PRIu64" %"PRIu64"", this,
+ now_time, now_time - prev_time);
+
+ update_position(this);
+
+ this->next_time = now_time + this->duration * SPA_NSEC_PER_SEC / this->rate;
+
+ if (SPA_LIKELY(this->clock)) {
+ this->clock->nsec = now_time;
+ this->clock->position += this->duration;
+ this->clock->duration = this->duration;
+ this->clock->rate_diff = 1.0f;
+ this->clock->next_nsec = this->next_time;
+ }
+
+ status = process_output(this);
+ spa_log_trace(this->log, "%p: status:%d", this, status);
+
+ spa_node_call_ready(&this->callbacks, status | SPA_STATUS_NEED_DATA);
+
+ set_timeout(this, this->next_time);
+}
+
+static int do_start(struct impl *this);
+
+static int do_release(struct impl *this);
+
+static int do_stop(struct impl *this);
+
+static void acquire_reply(GObject *source_object, GAsyncResult *res, gpointer user_data, bool notify)
+{
+ struct port *port;
+ struct impl *this;
+ const char *method;
+ GError *err = NULL;
+ GUnixFDList *fd_list = NULL;
+ GVariant *fd_handle = NULL;
+ int fd;
+ guint16 mtu;
+
+ if (notify) {
+ bluez5_gatt_characteristic1_call_acquire_notify_finish(
+ BLUEZ5_GATT_CHARACTERISTIC1(source_object), &fd_handle, &mtu, &fd_list, res, &err);
+ } else {
+ bluez5_gatt_characteristic1_call_acquire_write_finish(
+ BLUEZ5_GATT_CHARACTERISTIC1(source_object), &fd_handle, &mtu, &fd_list, res, &err);
+ }
+
+ if (g_error_matches(err, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
+ /* Operation canceled: user_data may be invalid by now. */
+ g_error_free(err);
+ return;
+ }
+
+ port = user_data;
+ this = port->impl;
+ method = notify ? "AcquireNotify" : "AcquireWrite";
+ if (err) {
+ spa_log_error(this->log, "%s.%s() for %s failed: %s",
+ BLUEZ_GATT_CHR_INTERFACE, method,
+ this->chr_path, err->message);
+ goto fail;
+ }
+
+ fd = g_unix_fd_list_get(fd_list, g_variant_get_handle(fd_handle), &err);
+ if (fd < 0) {
+ spa_log_error(this->log, "%s.%s() for %s failed to get fd: %s",
+ BLUEZ_GATT_CHR_INTERFACE, method,
+ this->chr_path, err->message);
+ goto fail;
+ }
+
+ spa_log_info(this->log, "%p: BLE MIDI %s %s success mtu:%d",
+ this, this->chr_path, method, mtu);
+ port->fd = fd;
+ port->mtu = mtu;
+ port->acquired = true;
+
+ if (port->direction == SPA_DIRECTION_OUTPUT) {
+ spa_bt_midi_parser_init(&this->parser);
+
+ /* Start source */
+ port->source.data = port;
+ port->source.fd = port->fd;
+ port->source.func = on_ready_read;
+ port->source.mask = SPA_IO_IN | SPA_IO_HUP | SPA_IO_ERR;
+ port->source.rmask = 0;
+ spa_loop_add_source(this->data_loop, &port->source);
+ }
+ return;
+
+fail:
+ g_error_free(err);
+ g_clear_object(&fd_list);
+ g_clear_object(&fd_handle);
+ do_stop(this);
+ do_release(this);
+}
+
+static void acquire_notify_reply(GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+ acquire_reply(source_object, res, user_data, true);
+}
+
+static void acquire_write_reply(GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+ acquire_reply(source_object, res, user_data, false);
+}
+
+static int do_acquire(struct port *port)
+{
+ struct impl *this = port->impl;
+ const char *method = (port->direction == SPA_DIRECTION_OUTPUT) ?
+ "AcquireNotify" : "AcquireWrite";
+ GVariant *options;
+ GVariantBuilder builder;
+
+ if (port->acquired)
+ return 0;
+ if (port->acquire_call)
+ return 0;
+
+ spa_log_info(this->log,
+ "%p: port %d: client %s for BLE MIDI device characteristic %s",
+ this, port->direction, method, this->chr_path);
+
+ port->acquire_call = g_cancellable_new();
+
+ g_variant_builder_init(&builder, G_VARIANT_TYPE("a{sv}"));
+ options = g_variant_builder_end(&builder);
+
+ if (port->direction == SPA_DIRECTION_OUTPUT) {
+ bluez5_gatt_characteristic1_call_acquire_notify(
+ BLUEZ5_GATT_CHARACTERISTIC1(this->proxy),
+ options,
+ NULL,
+ port->acquire_call,
+ acquire_notify_reply,
+ port);
+ } else {
+ bluez5_gatt_characteristic1_call_acquire_write(
+ BLUEZ5_GATT_CHARACTERISTIC1(this->proxy),
+ options,
+ NULL,
+ port->acquire_call,
+ acquire_write_reply,
+ port);
+ }
+
+ return 0;
+}
+
+static int server_do_acquire(struct port *port, int fd, uint16_t mtu)
+{
+ struct impl *this = port->impl;
+ const char *method = (port->direction == SPA_DIRECTION_OUTPUT) ?
+ "AcquireWrite" : "AcquireNotify";
+
+ spa_log_info(this->log,
+ "%p: port %d: server %s for BLE MIDI device characteristic %s",
+ this, port->direction, method, this->server->chr_path);
+
+ if (port->acquired) {
+ spa_log_info(this->log,
+ "%p: port %d: %s failed: already acquired",
+ this, port->direction, method);
+ return -EBUSY;
+ }
+
+ port->fd = fd;
+ port->mtu = mtu;
+
+ if (port->direction == SPA_DIRECTION_OUTPUT)
+ spa_bt_midi_parser_init(&this->parser);
+
+ /* Start source */
+ port->source.data = port;
+ port->source.fd = port->fd;
+ port->source.func = on_ready_read;
+ port->source.mask = SPA_IO_HUP | SPA_IO_ERR;
+ if (port->direction == SPA_DIRECTION_OUTPUT)
+ port->source.mask |= SPA_IO_IN;
+ port->source.rmask = 0;
+ spa_loop_add_source(this->data_loop, &port->source);
+
+ port->acquired = true;
+ return 0;
+}
+
+static int server_acquire_write(void *user_data, int fd, uint16_t mtu)
+{
+ struct impl *this = user_data;
+ return server_do_acquire(&this->ports[PORT_OUT], fd, mtu);
+}
+
+static int server_acquire_notify(void *user_data, int fd, uint16_t mtu)
+{
+ struct impl *this = user_data;
+ return server_do_acquire(&this->ports[PORT_IN], fd, mtu);
+}
+
+static int server_release(void *user_data)
+{
+ struct impl *this = user_data;
+ do_release(this);
+ return 0;
+}
+
+static const char *server_description(void *user_data)
+{
+ struct impl *this = user_data;
+ return this->props.device_name;
+}
+
+static int do_remove_port_source(struct spa_loop *loop,
+ bool async, uint32_t seq, const void *data, size_t size, void *user_data)
+{
+ struct impl *this = user_data;
+ int i;
+
+ for (i = 0; i < N_PORTS; ++i) {
+ struct port *port = &this->ports[i];
+
+ if (port->source.loop)
+ spa_loop_remove_source(this->data_loop, &port->source);
+ }
+
+ return 0;
+}
+
+static int do_remove_source(struct spa_loop *loop,
+ bool async,
+ uint32_t seq,
+ const void *data,
+ size_t size,
+ void *user_data)
+{
+ struct impl *this = user_data;
+ struct itimerspec ts;
+
+ if (this->timer_source.loop)
+ spa_loop_remove_source(this->data_loop, &this->timer_source);
+
+ ts.it_value.tv_sec = 0;
+ ts.it_value.tv_nsec = 0;
+ ts.it_interval.tv_sec = 0;
+ ts.it_interval.tv_nsec = 0;
+ spa_system_timerfd_settime(this->data_system, this->timerfd, 0, &ts, NULL);
+
+ return 0;
+}
+
+static int do_stop(struct impl *this)
+{
+ int res = 0;
+
+ spa_log_debug(this->log, "%p: stop", this);
+
+ spa_loop_invoke(this->data_loop, do_remove_source, 0, NULL, 0, true, this);
+
+ this->started = false;
+
+ return res;
+}
+
+static int do_release(struct impl *this)
+{
+ int res = 0;
+ size_t i;
+
+ spa_log_debug(this->log, "%p: release", this);
+
+ spa_loop_invoke(this->data_loop, do_remove_port_source, 0, NULL, 0, true, this);
+
+ for (i = 0; i < N_PORTS; ++i) {
+ struct port *port = &this->ports[i];
+
+ g_cancellable_cancel(port->acquire_call);
+ g_clear_object(&port->acquire_call);
+
+ unacquire_port(port);
+ }
+
+ return res;
+}
+
+static int do_start(struct impl *this)
+{
+ int res;
+ size_t i;
+
+ if (this->started)
+ return 0;
+
+ this->following = is_following(this);
+
+ update_position(this);
+
+ spa_log_debug(this->log, "%p: start following:%d",
+ this, this->following);
+
+ for (i = 0; i < N_PORTS; ++i) {
+ struct port *port = &this->ports[i];
+
+ switch (this->role) {
+ case NODE_CLIENT:
+ /* Acquire Bluetooth I/O */
+ if ((res = do_acquire(port)) < 0) {
+ do_stop(this);
+ do_release(this);
+ return res;
+ }
+ break;
+ case NODE_SERVER:
+ /*
+ * In MIDI server role, the device/BlueZ invokes
+ * the acquire asynchronously as available/needed.
+ */
+ break;
+ default:
+ spa_assert_not_reached();
+ }
+
+ reset_buffers(port);
+ }
+
+ midi_event_ringbuffer_init(&this->event_rbuf);
+
+ this->started = true;
+
+ /* Start timer */
+ this->timer_source.data = this;
+ this->timer_source.fd = this->timerfd;
+ this->timer_source.func = on_timeout;
+ this->timer_source.mask = SPA_IO_IN;
+ this->timer_source.rmask = 0;
+ spa_loop_add_source(this->data_loop, &this->timer_source);
+
+ set_timers(this);
+
+ return 0;
+}
+
+
+static int do_reassign_follower(struct spa_loop *loop,
+ bool async,
+ uint32_t seq,
+ const void *data,
+ size_t size,
+ void *user_data)
+{
+ struct impl *this = user_data;
+
+ set_timers(this);
+ return 0;
+}
+
+static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
+{
+ struct impl *this = object;
+ bool following;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ switch (id) {
+ case SPA_IO_Clock:
+ this->clock = data;
+ if (this->clock != NULL) {
+ spa_scnprintf(this->clock->name,
+ sizeof(this->clock->name),
+ "%s", this->props.clock_name);
+ }
+ break;
+ case SPA_IO_Position:
+ this->position = data;
+ break;
+ default:
+ return -ENOENT;
+ }
+
+ following = is_following(this);
+ if (this->started && following != this->following) {
+ spa_log_debug(this->log, "%p: reassign follower %d->%d", this, this->following, following);
+ this->following = following;
+ spa_loop_invoke(this->data_loop, do_reassign_follower, 0, NULL, 0, true, this);
+ }
+
+ return 0;
+}
+
+static void emit_node_info(struct impl *this, bool full);
+
+static int impl_node_enum_params(void *object, int seq,
+ uint32_t id, uint32_t start, uint32_t num,
+ const struct spa_pod *filter)
+{
+ struct impl *this = object;
+ struct spa_pod *param;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[1024];
+ struct spa_result_node_params result;
+ uint32_t count = 0;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+ spa_return_val_if_fail(num != 0, -EINVAL);
+
+ result.id = id;
+ result.next = start;
+next:
+ result.index = result.next++;
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+ switch (id) {
+ case SPA_PARAM_PropInfo:
+ {
+ struct props *p = &this->props;
+
+ switch (result.index) {
+ case 0:
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_PropInfo, id,
+ SPA_PROP_INFO_id, SPA_POD_Id(SPA_PROP_latencyOffsetNsec),
+ SPA_PROP_INFO_description, SPA_POD_String("Latency offset (ns)"),
+ SPA_PROP_INFO_type, SPA_POD_CHOICE_RANGE_Long(0LL, INT64_MIN, INT64_MAX));
+ break;
+ case 1:
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_PropInfo, id,
+ SPA_PROP_INFO_id, SPA_POD_Id(SPA_PROP_deviceName),
+ SPA_PROP_INFO_description, SPA_POD_String("Device name"),
+ SPA_PROP_INFO_type, SPA_POD_String(p->device_name));
+ break;
+ default:
+ return 0;
+ }
+ break;
+ }
+ case SPA_PARAM_Props:
+ {
+ struct props *p = &this->props;
+
+ switch (result.index) {
+ case 0:
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Props, id,
+ SPA_PROP_latencyOffsetNsec, SPA_POD_Long(p->latency_offset),
+ SPA_PROP_deviceName, SPA_POD_String(p->device_name));
+ break;
+ default:
+ return 0;
+ }
+ break;
+ }
+ default:
+ return -ENOENT;
+ }
+
+ if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+ goto next;
+
+ spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+ if (++count != num)
+ goto next;
+
+ return 0;
+}
+
+static void emit_port_info(struct impl *this, struct port *port, bool full);
+
+static void set_latency(struct impl *this, bool emit_latency)
+{
+ struct port *port = &this->ports[PORT_OUT];
+
+ port->latency.min_ns = port->latency.max_ns = this->props.latency_offset;
+
+ if (emit_latency) {
+ port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+ port->params[IDX_Latency].flags ^= SPA_PARAM_INFO_SERIAL;
+ emit_port_info(this, port, false);
+ }
+}
+
+static int apply_props(struct impl *this, const struct spa_pod *param)
+{
+ struct props new_props = this->props;
+ int changed = 0;
+
+ if (param == NULL) {
+ reset_props(&new_props);
+ } else {
+ spa_pod_parse_object(param,
+ SPA_TYPE_OBJECT_Props, NULL,
+ SPA_PROP_latencyOffsetNsec, SPA_POD_OPT_Long(&new_props.latency_offset),
+ SPA_PROP_deviceName, SPA_POD_OPT_Stringn(new_props.device_name,
+ sizeof(new_props.device_name)));
+ }
+
+ changed = (memcmp(&new_props, &this->props, sizeof(struct props)) != 0);
+ this->props = new_props;
+
+ if (changed)
+ set_latency(this, true);
+
+ return changed;
+}
+
+static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
+ const struct spa_pod *param)
+{
+ struct impl *this = object;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ switch (id) {
+ case SPA_PARAM_Props:
+ {
+ if (apply_props(this, param) > 0) {
+ this->info.change_mask |= SPA_NODE_CHANGE_MASK_PARAMS;
+ this->params[IDX_Props].flags ^= SPA_PARAM_INFO_SERIAL;
+ emit_node_info(this, false);
+ }
+ break;
+ }
+ default:
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+static int impl_node_send_command(void *object, const struct spa_command *command)
+{
+ struct impl *this = object;
+ int res, res2;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+ spa_return_val_if_fail(command != NULL, -EINVAL);
+
+ switch (SPA_NODE_COMMAND_ID(command)) {
+ case SPA_NODE_COMMAND_Start:
+ if ((res = do_start(this)) < 0)
+ return res;
+ break;
+ case SPA_NODE_COMMAND_Pause:
+ if ((res = do_stop(this)) < 0)
+ return res;
+ break;
+ case SPA_NODE_COMMAND_Suspend:
+ res = do_stop(this);
+ if (this->role == NODE_CLIENT)
+ res2 = do_release(this);
+ else
+ res2 = 0;
+ if (res < 0)
+ return res;
+ if (res2 < 0)
+ return res2;
+ break;
+ default:
+ return -ENOTSUP;
+ }
+ return 0;
+}
+
+static void emit_node_info(struct impl *this, bool full)
+{
+ const struct spa_dict_item node_info_items[] = {
+ { SPA_KEY_DEVICE_API, "bluez5" },
+ { SPA_KEY_MEDIA_CLASS, "Midi/Bridge" },
+ };
+ uint64_t old = full ? this->info.change_mask : 0;
+
+ if (full)
+ this->info.change_mask = this->info_all;
+ if (this->info.change_mask) {
+ this->info.props = &SPA_DICT_INIT_ARRAY(node_info_items);
+ spa_node_emit_info(&this->hooks, &this->info);
+ this->info.change_mask = old;
+ }
+}
+
+static void emit_port_info(struct impl *this, struct port *port, bool full)
+{
+ uint64_t old = full ? port->info.change_mask : 0;
+ if (full)
+ port->info.change_mask = port->info_all;
+ if (port->info.change_mask) {
+ spa_node_emit_port_info(&this->hooks, port->direction, port->id, &port->info);
+ port->info.change_mask = old;
+ }
+}
+
+static int
+impl_node_add_listener(void *object,
+ struct spa_hook *listener,
+ const struct spa_node_events *events,
+ void *data)
+{
+ struct impl *this = object;
+ struct spa_hook_list save;
+ size_t i;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
+
+ emit_node_info(this, true);
+
+ for (i = 0; i < N_PORTS; ++i)
+ emit_port_info(this, &this->ports[i], true);
+
+ spa_hook_list_join(&this->hooks, &save);
+
+ return 0;
+}
+
+static int
+impl_node_set_callbacks(void *object,
+ const struct spa_node_callbacks *callbacks,
+ void *data)
+{
+ struct impl *this = object;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ this->callbacks = SPA_CALLBACKS_INIT(callbacks, data);
+
+ return 0;
+}
+
+static int impl_node_sync(void *object, int seq)
+{
+ struct impl *this = object;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_node_emit_result(&this->hooks, seq, 0, 0, NULL);
+
+ return 0;
+}
+
+static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
+ const struct spa_dict *props)
+{
+ return -ENOTSUP;
+}
+
+static int impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
+{
+ return -ENOTSUP;
+}
+
+static int
+impl_node_port_enum_params(void *object, int seq,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t id, uint32_t start, uint32_t num,
+ const struct spa_pod *filter)
+{
+
+ struct impl *this = object;
+ struct port *port;
+ struct spa_pod *param;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[1024];
+ struct spa_result_node_params result;
+ uint32_t count = 0;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+ spa_return_val_if_fail(num != 0, -EINVAL);
+
+ spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+ port = GET_PORT(this, direction, port_id);
+
+ result.id = id;
+ result.next = start;
+next:
+ result.index = result.next++;
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+
+ switch (id) {
+ case SPA_PARAM_EnumFormat:
+ if (result.index > 0)
+ return 0;
+
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+ SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_application),
+ SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_control));
+ break;
+
+ case SPA_PARAM_Format:
+ if (!port->have_format)
+ return -EIO;
+ if (result.index > 0)
+ return 0;
+
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Format, SPA_PARAM_Format,
+ SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_application),
+ SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_control));
+ break;
+
+ case SPA_PARAM_Buffers:
+ if (!port->have_format)
+ return -EIO;
+ if (result.index > 0)
+ return 0;
+
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamBuffers, id,
+ SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(2, 1, MAX_BUFFERS),
+ SPA_PARAM_BUFFERS_blocks, SPA_POD_Int(1),
+ SPA_PARAM_BUFFERS_size, SPA_POD_CHOICE_RANGE_Int(
+ 4096, 4096, INT32_MAX),
+ SPA_PARAM_BUFFERS_stride, SPA_POD_Int(1));
+ break;
+
+ case SPA_PARAM_Meta:
+ switch (result.index) {
+ case 0:
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamMeta, id,
+ SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
+ SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
+ break;
+ default:
+ return 0;
+ }
+ break;
+
+ case SPA_PARAM_IO:
+ switch (result.index) {
+ case 0:
+ param = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_ParamIO, id,
+ SPA_PARAM_IO_id, SPA_POD_Id(SPA_IO_Buffers),
+ SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_buffers)));
+ break;
+ default:
+ return 0;
+ }
+ break;
+
+ case SPA_PARAM_Latency:
+ switch (result.index) {
+ case 0:
+ param = spa_latency_build(&b, id, &port->latency);
+ break;
+ default:
+ return 0;
+ }
+ break;
+
+ default:
+ return -ENOENT;
+ }
+
+ if (spa_pod_filter(&b, &result.param, param, filter) < 0)
+ goto next;
+
+ spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
+
+ if (++count != num)
+ goto next;
+
+ return 0;
+}
+
+static int port_set_format(struct impl *this, struct port *port,
+ uint32_t flags,
+ const struct spa_pod *format)
+{
+ int err;
+
+ if (format == NULL) {
+ if (!port->have_format)
+ return 0;
+
+ clear_buffers(this, port);
+ port->have_format = false;
+ } else {
+ struct spa_audio_info info = { 0 };
+
+ if ((err = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
+ return err;
+
+ if (info.media_type != SPA_MEDIA_TYPE_application ||
+ info.media_subtype != SPA_MEDIA_SUBTYPE_control)
+ return -EINVAL;
+
+ port->current_format = info;
+ port->have_format = true;
+ }
+
+ port->info.change_mask |= SPA_PORT_CHANGE_MASK_RATE;
+ port->info.rate = SPA_FRACTION(1, 1);
+ port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
+ if (port->have_format) {
+ port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
+ port->params[IDX_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
+ } else {
+ port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+ port->params[IDX_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+ }
+ emit_port_info(this, port, false);
+
+ return 0;
+}
+
+static int
+impl_node_port_set_param(void *object,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t id, uint32_t flags,
+ const struct spa_pod *param)
+{
+ struct impl *this = object;
+ struct port *port;
+ int res;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+ port = GET_PORT(this, direction, port_id);
+
+ switch (id) {
+ case SPA_PARAM_Format:
+ res = port_set_format(this, port, flags, param);
+ break;
+ case SPA_PARAM_Latency:
+ res = 0;
+ break;
+ default:
+ res = -ENOENT;
+ break;
+ }
+ return res;
+}
+
+static int
+impl_node_port_use_buffers(void *object,
+ enum spa_direction direction, uint32_t port_id,
+ uint32_t flags,
+ struct spa_buffer **buffers, uint32_t n_buffers)
+{
+ struct impl *this = object;
+ struct port *port;
+ uint32_t i;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+ port = GET_PORT(this, direction, port_id);
+
+ spa_log_debug(this->log, "%p: use buffers %d", this, n_buffers);
+
+ if (!port->have_format)
+ return -EIO;
+
+ clear_buffers(this, port);
+
+ for (i = 0; i < n_buffers; i++) {
+ struct buffer *b = &port->buffers[i];
+ struct spa_data *d = buffers[i]->datas;
+
+ b->buf = buffers[i];
+ b->id = i;
+
+ b->h = spa_buffer_find_meta_data(buffers[i], SPA_META_Header, sizeof(*b->h));
+
+ if (d[0].data == NULL) {
+ spa_log_error(this->log, "%p: need mapped memory", this);
+ return -EINVAL;
+ }
+ }
+ port->n_buffers = n_buffers;
+
+ reset_buffers(port);
+
+ return 0;
+}
+
+static int
+impl_node_port_set_io(void *object,
+ enum spa_direction direction,
+ uint32_t port_id,
+ uint32_t id,
+ void *data, size_t size)
+{
+ struct impl *this = object;
+ struct port *port;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
+
+ port = GET_PORT(this, direction, port_id);
+
+ switch (id) {
+ case SPA_IO_Buffers:
+ port->io = data;
+ break;
+ default:
+ return -ENOENT;
+ }
+ return 0;
+}
+
+static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
+{
+ struct impl *this = object;
+ struct port *port;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ spa_return_val_if_fail(CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+
+ port = GET_PORT(this, SPA_DIRECTION_OUTPUT, port_id);
+
+ if (port->n_buffers == 0)
+ return -EIO;
+
+ if (buffer_id >= port->n_buffers)
+ return -EINVAL;
+
+ recycle_buffer(this, port, buffer_id);
+
+ return 0;
+}
+
+static int impl_node_process(void *object)
+{
+ struct impl *this = object;
+ int status = SPA_STATUS_OK;
+
+ spa_return_val_if_fail(this != NULL, -EINVAL);
+
+ if (!this->started)
+ return SPA_STATUS_OK;
+
+ if (this->following) {
+ if (this->position) {
+ this->current_time = this->position->clock.nsec;
+ } else {
+ struct timespec now = { 0 };
+ spa_system_clock_gettime(this->data_system, CLOCK_MONOTONIC, &now);
+ this->current_time = SPA_TIMESPEC_TO_NSEC(&now);
+ }
+ }
+
+ update_position(this);
+
+ if (this->following)
+ status |= process_output(this);
+
+ status |= process_input(this);
+
+ return status;
+}
+
+static const struct spa_node_methods impl_node = {
+ SPA_VERSION_NODE_METHODS,
+ .add_listener = impl_node_add_listener,
+ .set_callbacks = impl_node_set_callbacks,
+ .sync = impl_node_sync,
+ .enum_params = impl_node_enum_params,
+ .set_param = impl_node_set_param,
+ .set_io = impl_node_set_io,
+ .send_command = impl_node_send_command,
+ .add_port = impl_node_add_port,
+ .remove_port = impl_node_remove_port,
+ .port_enum_params = impl_node_port_enum_params,
+ .port_set_param = impl_node_port_set_param,
+ .port_use_buffers = impl_node_port_use_buffers,
+ .port_set_io = impl_node_port_set_io,
+ .port_reuse_buffer = impl_node_port_reuse_buffer,
+ .process = impl_node_process,
+};
+
+static const struct spa_bt_midi_server_cb impl_server = {
+ .acquire_write = server_acquire_write,
+ .acquire_notify = server_acquire_notify,
+ .release = server_release,
+ .get_description = server_description,
+};
+
+static int impl_get_interface(struct spa_handle *handle, const char *type, void **interface)
+{
+ struct impl *this;
+
+ spa_return_val_if_fail(handle != NULL, -EINVAL);
+ spa_return_val_if_fail(interface != NULL, -EINVAL);
+
+ this = (struct impl *) handle;
+
+ if (spa_streq(type, SPA_TYPE_INTERFACE_Node))
+ *interface = &this->node;
+ else
+ return -ENOENT;
+
+ return 0;
+}
+
+static int impl_clear(struct spa_handle *handle)
+{
+ struct impl *this = (struct impl *) handle;
+
+ do_stop(this);
+ do_release(this);
+
+ free(this->chr_path);
+ if (this->timerfd > 0)
+ spa_system_close(this->data_system, this->timerfd);
+ if (this->server)
+ spa_bt_midi_server_destroy(this->server);
+ g_clear_object(&this->proxy);
+ g_clear_object(&this->conn);
+
+ spa_zero(*this);
+
+ return 0;
+}
+
+static size_t
+impl_get_size(const struct spa_handle_factory *factory,
+ const struct spa_dict *params)
+{
+ return sizeof(struct impl);
+}
+
+static int
+impl_init(const struct spa_handle_factory *factory,
+ struct spa_handle *handle,
+ const struct spa_dict *info,
+ const struct spa_support *support,
+ uint32_t n_support)
+{
+ struct impl *this;
+ const char *device_name = "";
+ int res = 0;
+ GError *err = NULL;
+ size_t i;
+
+ spa_return_val_if_fail(factory != NULL, -EINVAL);
+ spa_return_val_if_fail(handle != NULL, -EINVAL);
+
+ handle->get_interface = impl_get_interface;
+ handle->clear = impl_clear;
+
+ this = (struct impl *) handle;
+
+ this->log = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Log);
+ this->main_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_Loop);
+ this->data_loop = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataLoop);
+ this->data_system = spa_support_find(support, n_support, SPA_TYPE_INTERFACE_DataSystem);
+
+ if (this->log == NULL)
+ return -EINVAL;
+
+ spa_log_topic_init(this->log, &log_topic);
+
+ if (!(info && spa_atob(spa_dict_lookup(info, SPA_KEY_API_GLIB_MAINLOOP)))) {
+ spa_log_error(this->log, "Glib mainloop is not usable: %s not set",
+ SPA_KEY_API_GLIB_MAINLOOP);
+ return -EINVAL;
+ }
+
+ if (this->data_loop == NULL) {
+ spa_log_error(this->log, "a data loop is needed");
+ return -EINVAL;
+ }
+ if (this->data_system == NULL) {
+ spa_log_error(this->log, "a data system is needed");
+ return -EINVAL;
+ }
+
+ this->role = NODE_CLIENT;
+
+ if (info) {
+ const char *str;
+
+ if ((str = spa_dict_lookup(info, SPA_KEY_API_BLUEZ5_PATH)) != NULL)
+ this->chr_path = strdup(str);
+
+ if ((str = spa_dict_lookup(info, SPA_KEY_API_BLUEZ5_ROLE)) != NULL) {
+ if (spa_streq(str, "server"))
+ this->role = NODE_SERVER;
+ }
+
+ if ((str = spa_dict_lookup(info, "node.nick")) != NULL)
+ device_name = str;
+ else if ((str = spa_dict_lookup(info, "node.description")) != NULL)
+ device_name = str;
+ }
+
+ if (this->role == NODE_CLIENT && this->chr_path == NULL) {
+ spa_log_error(this->log, "missing MIDI service characteristic path");
+ res = -EINVAL;
+ goto fail;
+ }
+
+ this->conn = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &err);
+ if (this->conn == NULL) {
+ spa_log_error(this->log, "failed to get dbus connection: %s",
+ err->message);
+ g_error_free(err);
+ res = -EIO;
+ goto fail;
+ }
+
+ this->node.iface = SPA_INTERFACE_INIT(
+ SPA_TYPE_INTERFACE_Node,
+ SPA_VERSION_NODE,
+ &impl_node, this);
+ spa_hook_list_init(&this->hooks);
+
+ reset_props(&this->props);
+
+ spa_scnprintf(this->props.device_name, sizeof(this->props.device_name),
+ "%s", device_name);
+
+ /* set the node info */
+ this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
+ SPA_NODE_CHANGE_MASK_PROPS |
+ SPA_NODE_CHANGE_MASK_PARAMS;
+ this->info = SPA_NODE_INFO_INIT();
+ this->info.max_input_ports = 1;
+ this->info.max_output_ports = 1;
+ this->info.flags = SPA_NODE_FLAG_RT;
+ this->params[IDX_PropInfo] = SPA_PARAM_INFO(SPA_PARAM_PropInfo, SPA_PARAM_INFO_READ);
+ this->params[IDX_Props] = SPA_PARAM_INFO(SPA_PARAM_Props, SPA_PARAM_INFO_READWRITE);
+ this->params[IDX_NODE_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+ this->info.params = this->params;
+ this->info.n_params = N_NODE_PARAMS;
+
+ /* set the port info */
+ for (i = 0; i < N_PORTS; ++i) {
+ struct port *port = &this->ports[i];
+ static const struct spa_dict_item in_port_items[] = {
+ SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "8 bit raw midi"),
+ SPA_DICT_ITEM_INIT(SPA_KEY_PORT_NAME, "in"),
+ SPA_DICT_ITEM_INIT(SPA_KEY_PORT_ALIAS, "in"),
+ };
+ static const struct spa_dict_item out_port_items[] = {
+ SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "8 bit raw midi"),
+ SPA_DICT_ITEM_INIT(SPA_KEY_PORT_NAME, "out"),
+ SPA_DICT_ITEM_INIT(SPA_KEY_PORT_ALIAS, "out"),
+ };
+ static const struct spa_dict in_port_props = SPA_DICT_INIT_ARRAY(in_port_items);
+ static const struct spa_dict out_port_props = SPA_DICT_INIT_ARRAY(out_port_items);
+
+ spa_zero(*port);
+
+ port->impl = this;
+
+ port->id = 0;
+ port->direction = (i == PORT_OUT) ? SPA_DIRECTION_OUTPUT :
+ SPA_DIRECTION_INPUT;
+
+ port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
+ SPA_PORT_CHANGE_MASK_PROPS |
+ SPA_PORT_CHANGE_MASK_PARAMS;
+ port->info = SPA_PORT_INFO_INIT();
+ port->info.change_mask = SPA_PORT_CHANGE_MASK_FLAGS;
+ port->info.flags = SPA_PORT_FLAG_LIVE;
+ port->params[IDX_EnumFormat] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
+ port->params[IDX_Meta] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
+ port->params[IDX_IO] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
+ port->params[IDX_Format] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
+ port->params[IDX_Buffers] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
+ port->params[IDX_Latency] = SPA_PARAM_INFO(SPA_PARAM_Latency, SPA_PARAM_INFO_READWRITE);
+ port->info.params = port->params;
+ port->info.n_params = N_PORT_PARAMS;
+ port->info.props = (i == PORT_OUT) ? &out_port_props : &in_port_props;
+
+ port->latency = SPA_LATENCY_INFO(port->direction);
+ port->latency.min_quantum = 1.0f;
+ port->latency.max_quantum = 1.0f;
+
+ /* Init the buffer lists */
+ spa_list_init(&port->ready);
+ spa_list_init(&port->free);
+ }
+
+ this->duration = 1024;
+ this->rate = 48000;
+
+ set_latency(this, false);
+
+ if (this->role == NODE_SERVER) {
+ this->server = spa_bt_midi_server_new(&impl_server, this->conn, this->log, this);
+ if (this->server == NULL)
+ goto fail;
+ } else {
+ this->proxy = bluez5_gatt_characteristic1_proxy_new_sync(this->conn,
+ G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
+ BLUEZ_SERVICE,
+ this->chr_path,
+ NULL,
+ &err);
+ if (this->proxy == NULL) {
+ spa_log_error(this->log,
+ "Failed to create BLE MIDI GATT proxy %s: %s",
+ this->chr_path, err->message);
+ g_error_free(err);
+ res = -EIO;
+ goto fail;
+ }
+ }
+
+ this->timerfd = spa_system_timerfd_create(this->data_system,
+ CLOCK_MONOTONIC, SPA_FD_CLOEXEC | SPA_FD_NONBLOCK);
+
+ return 0;
+
+fail:
+ res = (res < 0) ? res : ((errno > 0) ? -errno : -EIO);
+ impl_clear(handle);
+ return res;
+}
+
+static const struct spa_interface_info impl_interfaces[] = {
+ {SPA_TYPE_INTERFACE_Node,},
+};
+
+static int
+impl_enum_interface_info(const struct spa_handle_factory *factory,
+ const struct spa_interface_info **info, uint32_t *index)
+{
+ spa_return_val_if_fail(factory != NULL, -EINVAL);
+ spa_return_val_if_fail(info != NULL, -EINVAL);
+ spa_return_val_if_fail(index != NULL, -EINVAL);
+
+ switch (*index) {
+ case 0:
+ *info = &impl_interfaces[*index];
+ break;
+ default:
+ return 0;
+ }
+ (*index)++;
+ return 1;
+}
+
+static const struct spa_dict_item info_items[] = {
+ { SPA_KEY_FACTORY_AUTHOR, "Pauli Virtanen <pav@iki.fi>" },
+ { SPA_KEY_FACTORY_DESCRIPTION, "Bluez5 MIDI connection" },
+};
+
+static const struct spa_dict info = SPA_DICT_INIT_ARRAY(info_items);
+
+const struct spa_handle_factory spa_bluez5_midi_node_factory = {
+ SPA_VERSION_HANDLE_FACTORY,
+ SPA_NAME_API_BLUEZ5_MIDI_NODE,
+ &info,
+ impl_get_size,
+ impl_init,
+ impl_enum_interface_info,
+};