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-rw-r--r--spa/plugins/bluez5/sco-io.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/spa/plugins/bluez5/sco-io.c b/spa/plugins/bluez5/sco-io.c
new file mode 100644
index 0000000..0657750
--- /dev/null
+++ b/spa/plugins/bluez5/sco-io.c
@@ -0,0 +1,289 @@
+/* Spa SCO I/O
+ *
+ * Copyright © 2019 Collabora Ltd.
+ *
+ * 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 <arpa/inet.h>
+#include <sys/ioctl.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/monitor/device.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/audio/format.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/pod/filter.h>
+
+#include <sbc/sbc.h>
+
+#include "defs.h"
+
+
+/* We'll use the read rx data size to find the correct packet size for writing,
+ * since kernel might not report it as the socket MTU, see
+ * https://lore.kernel.org/linux-bluetooth/20201210003528.3pmaxvubiwegxmhl@pali/T/
+ *
+ * We continue reading also when there's no source connected, to keep socket
+ * flushed.
+ *
+ * XXX: when the kernel/backends start giving the right values, the heuristic
+ * XXX: can be removed
+ */
+#define MAX_MTU 1024
+
+
+struct spa_bt_sco_io {
+ bool started;
+
+ uint8_t read_buffer[MAX_MTU];
+ uint32_t read_size;
+
+ int fd;
+ uint16_t read_mtu;
+ uint16_t write_mtu;
+
+ struct spa_loop *data_loop;
+ struct spa_source source;
+
+ int (*source_cb)(void *userdata, uint8_t *data, int size);
+ void *source_userdata;
+
+ int (*sink_cb)(void *userdata);
+ void *sink_userdata;
+};
+
+
+static void update_source(struct spa_bt_sco_io *io)
+{
+ int enabled;
+ int changed = 0;
+
+ enabled = io->sink_cb != NULL;
+ if (SPA_FLAG_IS_SET(io->source.mask, SPA_IO_OUT) != enabled) {
+ SPA_FLAG_UPDATE(io->source.mask, SPA_IO_OUT, enabled);
+ changed = 1;
+ }
+
+ if (changed) {
+ spa_loop_update_source(io->data_loop, &io->source);
+ }
+}
+
+static void sco_io_on_ready(struct spa_source *source)
+{
+ struct spa_bt_sco_io *io = source->data;
+
+ if (SPA_FLAG_IS_SET(source->rmask, SPA_IO_IN)) {
+ int res;
+
+ read_again:
+ res = read(io->fd, io->read_buffer, SPA_MIN(io->read_mtu, MAX_MTU));
+ if (res <= 0) {
+ if (errno == EINTR) {
+ /* retry if interrupted */
+ goto read_again;
+ } else if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ /* no data: try it next time */
+ goto read_done;
+ }
+
+ /* error */
+ goto stop;
+ }
+
+ io->read_size = res;
+
+ if (io->source_cb) {
+ int res;
+ res = io->source_cb(io->source_userdata, io->read_buffer, io->read_size);
+ if (res) {
+ io->source_cb = NULL;
+ }
+ }
+ }
+
+read_done:
+ if (SPA_FLAG_IS_SET(source->rmask, SPA_IO_OUT)) {
+ if (io->sink_cb) {
+ int res;
+ res = io->sink_cb(io->sink_userdata);
+ if (res) {
+ io->sink_cb = NULL;
+ }
+ }
+ }
+
+ if (SPA_FLAG_IS_SET(source->rmask, SPA_IO_ERR) || SPA_FLAG_IS_SET(source->rmask, SPA_IO_HUP)) {
+ goto stop;
+ }
+
+ /* Poll socket in/out only if necessary */
+ update_source(io);
+
+ return;
+
+stop:
+ if (io->source.loop) {
+ spa_loop_remove_source(io->data_loop, &io->source);
+ io->started = false;
+ }
+}
+
+/*
+ * Write data to socket in correctly sized blocks.
+ * Returns the number of bytes written, 0 when data cannot be written now or
+ * there is too little of it to write, and <0 on write error.
+ */
+int spa_bt_sco_io_write(struct spa_bt_sco_io *io, uint8_t *buf, int size)
+{
+ uint16_t packet_size;
+ uint8_t *buf_start = buf;
+
+ if (io->read_size == 0) {
+ /* The proper write packet size is not known yet */
+ return 0;
+ }
+
+ packet_size = SPA_MIN(io->write_mtu, io->read_size);
+
+ if (size < packet_size) {
+ return 0;
+ }
+
+ do {
+ int written;
+
+ written = write(io->fd, buf, packet_size);
+ if (written < 0) {
+ if (errno == EINTR) {
+ /* retry if interrupted */
+ continue;
+ } else if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ /* Don't continue writing */
+ break;
+ }
+ return -errno;
+ }
+
+ buf += written;
+ size -= written;
+ } while (size >= packet_size);
+
+ return buf - buf_start;
+}
+
+
+struct spa_bt_sco_io *spa_bt_sco_io_create(struct spa_loop *data_loop,
+ int fd,
+ uint16_t read_mtu,
+ uint16_t write_mtu)
+{
+ struct spa_bt_sco_io *io;
+
+ io = calloc(1, sizeof(struct spa_bt_sco_io));
+ if (io == NULL)
+ return io;
+
+ io->fd = fd;
+ io->read_mtu = read_mtu;
+ io->write_mtu = write_mtu;
+ io->data_loop = data_loop;
+
+ io->read_size = 0;
+
+ /* Add the ready callback */
+ io->source.data = io;
+ io->source.fd = io->fd;
+ io->source.func = sco_io_on_ready;
+ io->source.mask = SPA_IO_IN | SPA_IO_OUT | SPA_IO_ERR | SPA_IO_HUP;
+ io->source.rmask = 0;
+ spa_loop_add_source(io->data_loop, &io->source);
+
+ io->started = true;
+
+ return io;
+}
+
+static int do_remove_source(struct spa_loop *loop,
+ bool async,
+ uint32_t seq,
+ const void *data,
+ size_t size,
+ void *user_data)
+{
+ struct spa_bt_sco_io *io = user_data;
+
+ if (io->source.loop)
+ spa_loop_remove_source(io->data_loop, &io->source);
+
+ return 0;
+}
+
+void spa_bt_sco_io_destroy(struct spa_bt_sco_io *io)
+{
+ if (io->started)
+ spa_loop_invoke(io->data_loop, do_remove_source, 0, NULL, 0, true, io);
+
+ io->started = false;
+ free(io);
+}
+
+/* Set source callback.
+ * This function should only be called from the data thread.
+ * Callback is called (in data loop) with data just read from the socket.
+ */
+void spa_bt_sco_io_set_source_cb(struct spa_bt_sco_io *io, int (*source_cb)(void *, uint8_t *, int), void *userdata)
+{
+ io->source_cb = source_cb;
+ io->source_userdata = userdata;
+
+ if (io->started) {
+ update_source(io);
+ }
+}
+
+/* Set sink callback.
+ * This function should only be called from the data thread.
+ * Callback is called (in data loop) when socket can be written to.
+ */
+void spa_bt_sco_io_set_sink_cb(struct spa_bt_sco_io *io, int (*sink_cb)(void *), void *userdata)
+{
+ io->sink_cb = sink_cb;
+ io->sink_userdata = userdata;
+
+ if (io->started) {
+ update_source(io);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-21 23:32:00 +0000