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-rw-r--r--src/tools/pw-loopback.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/src/tools/pw-loopback.c b/src/tools/pw-loopback.c
new file mode 100644
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--- /dev/null
+++ b/src/tools/pw-loopback.c
@@ -0,0 +1,284 @@
+/* PipeWire
+ *
+ * Copyright © 2021 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <getopt.h>
+#include <limits.h>
+#include <math.h>
+#include <locale.h>
+
+#include <spa/utils/result.h>
+#include <spa/pod/builder.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/param/audio/raw.h>
+#include <spa/utils/json.h>
+
+#include <pipewire/pipewire.h>
+#include <pipewire/impl.h>
+
+#define DEFAULT_RATE 48000
+#define DEFAULT_CHANNELS 2
+#define DEFAULT_CHANNEL_MAP "[ FL, FR ]"
+
+struct data {
+ struct pw_main_loop *loop;
+ struct pw_context *context;
+
+ struct pw_impl_module *module;
+ struct spa_hook module_listener;
+
+ const char *opt_node_name;
+ const char *opt_group_name;
+ const char *opt_channel_map;
+
+ uint32_t channels;
+ uint32_t latency;
+ float delay;
+
+ struct pw_properties *capture_props;
+ struct pw_properties *playback_props;
+};
+
+static void do_quit(void *data, int signal_number)
+{
+ struct data *d = data;
+ pw_main_loop_quit(d->loop);
+}
+
+static void module_destroy(void *data)
+{
+ struct data *d = data;
+ spa_hook_remove(&d->module_listener);
+ d->module = NULL;
+ pw_main_loop_quit(d->loop);
+}
+
+static const struct pw_impl_module_events module_events = {
+ PW_VERSION_IMPL_MODULE_EVENTS,
+ .destroy = module_destroy
+};
+
+
+static void show_help(struct data *data, const char *name, bool error)
+{
+ fprintf(error ? stderr : stdout, "%s [options]\n"
+ " -h, --help Show this help\n"
+ " --version Show version\n"
+ " -r, --remote Remote daemon name\n"
+ " -n, --name Node name (default '%s')\n"
+ " -g, --group Node group (default '%s')\n"
+ " -c, --channels Number of channels (default %d)\n"
+ " -m, --channel-map Channel map (default '%s')\n"
+ " -l, --latency Desired latency in ms\n"
+ " -d, --delay Desired delay in float s\n"
+ " -C --capture Capture source to connect to (name or serial)\n"
+ " --capture-props Capture stream properties\n"
+ " -P --playback Playback sink to connect to (name or serial)\n"
+ " --playback-props Playback stream properties\n",
+ name,
+ data->opt_node_name,
+ data->opt_group_name,
+ data->channels,
+ data->opt_channel_map);
+}
+
+int main(int argc, char *argv[])
+{
+ struct data data = { 0 };
+ struct pw_loop *l;
+ const char *opt_remote = NULL;
+ char cname[256], value[256];
+ char *args;
+ size_t size;
+ FILE *f;
+ static const struct option long_options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, 'V' },
+ { "remote", required_argument, NULL, 'r' },
+ { "group", required_argument, NULL, 'g' },
+ { "name", required_argument, NULL, 'n' },
+ { "channels", required_argument, NULL, 'c' },
+ { "latency", required_argument, NULL, 'l' },
+ { "delay", required_argument, NULL, 'd' },
+ { "capture", required_argument, NULL, 'C' },
+ { "playback", required_argument, NULL, 'P' },
+ { "capture-props", required_argument, NULL, 'i' },
+ { "playback-props", required_argument, NULL, 'o' },
+ { NULL, 0, NULL, 0}
+ };
+ int c, res = -1;
+
+ setlocale(LC_ALL, "");
+ pw_init(&argc, &argv);
+
+ data.channels = DEFAULT_CHANNELS;
+ data.opt_channel_map = DEFAULT_CHANNEL_MAP;
+ data.opt_group_name = pw_get_client_name();
+ if (snprintf(cname, sizeof(cname), "%s-%zd", argv[0], (size_t) getpid()) > 0)
+ data.opt_group_name = cname;
+ data.opt_node_name = data.opt_group_name;
+
+ data.capture_props = pw_properties_new(NULL, NULL);
+ data.playback_props = pw_properties_new(NULL, NULL);
+ if (data.capture_props == NULL || data.playback_props == NULL) {
+ fprintf(stderr, "can't create properties: %m\n");
+ goto exit;
+ }
+
+ while ((c = getopt_long(argc, argv, "hVr:n:g:c:m:l:d:C:P:i:o:", long_options, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ show_help(&data, argv[0], false);
+ return 0;
+ case 'V':
+ printf("%s\n"
+ "Compiled with libpipewire %s\n"
+ "Linked with libpipewire %s\n",
+ argv[0],
+ pw_get_headers_version(),
+ pw_get_library_version());
+ return 0;
+ case 'r':
+ opt_remote = optarg;
+ break;
+ case 'n':
+ data.opt_node_name = optarg;
+ break;
+ case 'g':
+ data.opt_group_name = optarg;
+ break;
+ case 'c':
+ data.channels = atoi(optarg);
+ break;
+ case 'm':
+ data.opt_channel_map = optarg;
+ break;
+ case 'l':
+ data.latency = atoi(optarg) * DEFAULT_RATE / SPA_MSEC_PER_SEC;
+ break;
+ case 'd':
+ data.delay = atof(optarg);
+ break;
+ case 'C':
+ pw_properties_set(data.capture_props, PW_KEY_TARGET_OBJECT, optarg);
+ break;
+ case 'P':
+ pw_properties_set(data.playback_props, PW_KEY_TARGET_OBJECT, optarg);
+ break;
+ case 'i':
+ pw_properties_update_string(data.capture_props, optarg, strlen(optarg));
+ break;
+ case 'o':
+ pw_properties_update_string(data.playback_props, optarg, strlen(optarg));
+ break;
+ default:
+ show_help(&data, argv[0], true);
+ return -1;
+ }
+ }
+
+ data.loop = pw_main_loop_new(NULL);
+ if (data.loop == NULL) {
+ fprintf(stderr, "can't create main loop: %m\n");
+ goto exit;
+ }
+
+ l = pw_main_loop_get_loop(data.loop);
+ pw_loop_add_signal(l, SIGINT, do_quit, &data);
+ pw_loop_add_signal(l, SIGTERM, do_quit, &data);
+
+ data.context = pw_context_new(l, NULL, 0);
+ if (data.context == NULL) {
+ fprintf(stderr, "can't create context: %m\n");
+ goto exit;
+ }
+
+
+ if ((f = open_memstream(&args, &size)) == NULL) {
+ fprintf(stderr, "can't open memstream: %m\n");
+ goto exit;
+ }
+
+ fprintf(f, "{");
+
+ if (opt_remote != NULL)
+ fprintf(f, " remote.name = \"%s\"", opt_remote);
+ if (data.latency != 0)
+ fprintf(f, " node.latency = %u/%u", data.latency, DEFAULT_RATE);
+ if (data.delay != 0.0f)
+ fprintf(f, " target.delay.sec = %s",
+ spa_json_format_float(value, sizeof(value), data.delay));
+ if (data.channels != 0)
+ fprintf(f, " audio.channels = %u", data.channels);
+ if (data.opt_channel_map != NULL)
+ fprintf(f, " audio.position = %s", data.opt_channel_map);
+ if (data.opt_node_name != NULL)
+ fprintf(f, " node.name = %s", data.opt_node_name);
+
+ if (data.opt_group_name != NULL) {
+ pw_properties_set(data.capture_props, PW_KEY_NODE_GROUP, data.opt_group_name);
+ pw_properties_set(data.playback_props, PW_KEY_NODE_GROUP, data.opt_group_name);
+ }
+
+ fprintf(f, " capture.props = {");
+ pw_properties_serialize_dict(f, &data.capture_props->dict, 0);
+ fprintf(f, " } playback.props = {");
+ pw_properties_serialize_dict(f, &data.playback_props->dict, 0);
+ fprintf(f, " } }");
+ fclose(f);
+
+ pw_log_info("loading module with %s", args);
+
+ data.module = pw_context_load_module(data.context,
+ "libpipewire-module-loopback", args,
+ NULL);
+ free(args);
+
+ if (data.module == NULL) {
+ fprintf(stderr, "can't load module: %m\n");
+ goto exit;
+ }
+
+ pw_impl_module_add_listener(data.module,
+ &data.module_listener, &module_events, &data);
+
+ pw_main_loop_run(data.loop);
+
+ res = 0;
+exit:
+ if (data.module)
+ pw_impl_module_destroy(data.module);
+ if (data.context)
+ pw_context_destroy(data.context);
+ if (data.loop)
+ pw_main_loop_destroy(data.loop);
+ pw_properties_free(data.capture_props);
+ pw_properties_free(data.playback_props);
+ pw_deinit();
+
+ return res;
+}
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