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-rw-r--r--spa/examples/example-control.c560
1 files changed, 560 insertions, 0 deletions
diff --git a/spa/examples/example-control.c b/spa/examples/example-control.c
new file mode 100644
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+++ b/spa/examples/example-control.c
@@ -0,0 +1,560 @@
+/* Spa
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * 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.
+ */
+
+/*
+ [title]
+ [title]
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <pthread.h>
+#include <poll.h>
+
+#include <spa/support/plugin.h>
+#include <spa/support/log-impl.h>
+#include <spa/support/loop.h>
+#include <spa/node/node.h>
+#include <spa/node/io.h>
+#include <spa/node/utils.h>
+#include <spa/param/param.h>
+#include <spa/param/props.h>
+#include <spa/param/audio/format-utils.h>
+#include <spa/utils/names.h>
+#include <spa/utils/result.h>
+#include <spa/utils/string.h>
+
+#define M_PI_M2 ( M_PI + M_PI )
+
+static SPA_LOG_IMPL(default_log);
+
+#define spa_debug(f,...) spa_log_trace(&default_log.log, f, __VA_ARGS__)
+
+#include <spa/graph/graph.h>
+
+#include <spa/debug/pod.h>
+
+struct buffer {
+ struct spa_buffer buffer;
+ struct spa_meta metas[1];
+ struct spa_meta_header header;
+ struct spa_data datas[1];
+ struct spa_chunk chunks[1];
+};
+
+struct data {
+ const char *plugin_dir;
+ struct spa_log *log;
+ struct spa_system *system;
+ struct spa_loop *loop;
+ struct spa_loop_control *control;
+ struct spa_support support[5];
+ uint32_t n_support;
+
+ struct spa_graph graph;
+ struct spa_graph_state graph_state;
+ struct spa_graph_node source_node;
+ struct spa_graph_state source_state;
+ struct spa_graph_port source_out;
+ struct spa_graph_port sink_in;
+ struct spa_graph_node sink_node;
+ struct spa_graph_state sink_state;
+
+ struct spa_node *sink;
+
+ struct spa_node *source;
+ struct spa_io_buffers source_sink_io[1];
+ struct spa_buffer *source_buffers[1];
+ struct buffer source_buffer[1];
+
+ uint8_t ctrl[1024];
+ double freq_accum;
+ double volume_accum;
+
+ bool running;
+ pthread_t thread;
+};
+
+#define MIN_LATENCY 1024
+
+#define BUFFER_SIZE 4096
+
+static void
+init_buffer(struct data *data, struct spa_buffer **bufs, struct buffer *ba, int n_buffers,
+ size_t size)
+{
+ int i;
+
+ for (i = 0; i < n_buffers; i++) {
+ struct buffer *b = &ba[i];
+ bufs[i] = &b->buffer;
+
+ b->buffer.metas = b->metas;
+ b->buffer.n_metas = 1;
+ b->buffer.datas = b->datas;
+ b->buffer.n_datas = 1;
+
+ b->header.flags = 0;
+ b->header.seq = 0;
+ b->header.pts = 0;
+ b->header.dts_offset = 0;
+ b->metas[0].type = SPA_META_Header;
+ b->metas[0].data = &b->header;
+ b->metas[0].size = sizeof(b->header);
+
+ b->datas[0].type = SPA_DATA_MemPtr;
+ b->datas[0].flags = 0;
+ b->datas[0].fd = -1;
+ b->datas[0].mapoffset = 0;
+ b->datas[0].maxsize = size;
+ b->datas[0].data = malloc(size);
+ b->datas[0].chunk = &b->chunks[0];
+ b->datas[0].chunk->offset = 0;
+ b->datas[0].chunk->size = 0;
+ b->datas[0].chunk->stride = 0;
+ }
+}
+
+static int make_node(struct data *data, struct spa_node **node, const char *lib, const char *name)
+{
+ struct spa_handle *handle;
+ int res;
+ void *hnd;
+ spa_handle_factory_enum_func_t enum_func;
+ uint32_t i;
+ char *path;
+
+ if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
+ return -ENOMEM;
+ }
+ if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
+ printf("can't load %s: %s\n", lib, dlerror());
+ free(path);
+ return -ENOENT;
+ }
+ free(path);
+ if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
+ printf("can't find enum function\n");
+ return -ENOENT;
+ }
+
+ for (i = 0;;) {
+ const struct spa_handle_factory *factory;
+ void *iface;
+
+ if ((res = enum_func(&factory, &i)) <= 0) {
+ if (res != 0)
+ printf("can't enumerate factories: %s\n", spa_strerror(res));
+ break;
+ }
+ if (factory->version < 1)
+ continue;
+ if (!spa_streq(factory->name, name))
+ continue;
+
+ handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
+ if ((res =
+ spa_handle_factory_init(factory, handle, NULL, data->support,
+ data->n_support)) < 0) {
+ printf("can't make factory instance: %d\n", res);
+ return res;
+ }
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ *node = iface;
+ return 0;
+ }
+ return -EBADF;
+}
+
+static void update_props(struct data *data)
+{
+ struct spa_pod_builder b;
+ struct spa_pod *pod;
+ struct spa_pod_frame f[2];
+
+ spa_pod_builder_init(&b, data->ctrl, sizeof(data->ctrl));
+
+#if 0
+ spa_pod_builder_push_sequence(&b, &f[0], 0);
+ spa_pod_builder_control(&b, 0, SPA_CONTROL_Properties);
+ spa_pod_builder_push_object(&b, &f[1], SPA_TYPE_OBJECT_Props, 0);
+ spa_pod_builder_prop(&b, SPA_PROP_frequency, 0);
+ spa_pod_builder_float(&b, ((sin(data->freq_accum) + 1.0) * 200.0) + 440.0);
+ spa_pod_builder_prop(&b, SPA_PROP_volume, 0);
+ spa_pod_builder_float(&b, (sin(data->volume_accum) / 2.0) + 0.5);
+ spa_pod_builder_pop(&b, &f[1]);
+ pod = spa_pod_builder_pop(&b, &f[0]);
+#else
+ spa_pod_builder_push_sequence(&b, &f[0], 0);
+ spa_pod_builder_control(&b, 0, SPA_CONTROL_Properties);
+ spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Props, 0,
+ SPA_PROP_frequency, SPA_POD_Float(((sin(data->freq_accum) + 1.0) * 200.0) + 440.0),
+ SPA_PROP_volume, SPA_POD_Float((sin(data->volume_accum) / 2.0) + 0.5));
+ pod = spa_pod_builder_pop(&b, &f[0]);
+#endif
+
+ spa_debug_pod(0, NULL, pod);
+
+ data->freq_accum += M_PI_M2 / 880.0;
+ if (data->freq_accum >= M_PI_M2)
+ data->freq_accum -= M_PI_M2;
+
+ data->volume_accum += M_PI_M2 / 2000.0;
+ if (data->volume_accum >= M_PI_M2)
+ data->volume_accum -= M_PI_M2;
+}
+
+static int on_sink_ready(void *_data, int status)
+{
+ struct data *data = _data;
+
+ update_props(data);
+
+ spa_graph_node_process(&data->source_node);
+ spa_graph_node_process(&data->sink_node);
+ return 0;
+}
+
+static int
+on_sink_reuse_buffer(void *_data, uint32_t port_id, uint32_t buffer_id)
+{
+ struct data *data = _data;
+
+ data->source_sink_io[0].buffer_id = buffer_id;
+ return 0;
+}
+
+static const struct spa_node_callbacks sink_callbacks = {
+ SPA_VERSION_NODE_CALLBACKS,
+ .ready = on_sink_ready,
+ .reuse_buffer = on_sink_reuse_buffer
+};
+
+static int make_nodes(struct data *data, const char *device)
+{
+ int res;
+ struct spa_pod *props;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[512];
+ //uint32_t idx;
+
+ if ((res = make_node(data, &data->sink,
+ "alsa/libspa-alsa.so",
+ SPA_NAME_API_ALSA_PCM_SINK)) < 0) {
+ printf("can't create alsa-sink: %d\n", res);
+ return res;
+ }
+ spa_node_set_callbacks(data->sink, &sink_callbacks, data);
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+ props = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Props, 0,
+ SPA_PROP_device, SPA_POD_String(device ? device : "hw:0"),
+ SPA_PROP_minLatency, SPA_POD_Int(MIN_LATENCY));
+
+ spa_debug_pod(0, NULL, props);
+
+ if ((res = spa_node_set_param(data->sink, SPA_PARAM_Props, 0, props)) < 0)
+ printf("got set_props error %d\n", res);
+
+ if ((res = make_node(data, &data->source,
+ "audiotestsrc/libspa-audiotestsrc.so",
+ "audiotestsrc")) < 0) {
+ printf("can't create audiotestsrc: %d\n", res);
+ return res;
+ }
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+ props = spa_pod_builder_add_object(&b,
+ SPA_TYPE_OBJECT_Props, 0,
+ SPA_PROP_frequency, SPA_POD_Float(600.0),
+ SPA_PROP_volume, SPA_POD_Float(0.5),
+ SPA_PROP_live, SPA_POD_Bool(false));
+
+ if ((res = spa_node_set_param(data->source, SPA_PARAM_Props, 0, props)) < 0)
+ printf("got set_props error %d\n", res);
+
+ if ((res = spa_node_port_set_io(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_IO_Control,
+ &data->ctrl, sizeof(data->ctrl))) < 0) {
+ printf("can't set_io freq: %d\n", res);
+ return res;
+ }
+
+ data->source_sink_io[0] = SPA_IO_BUFFERS_INIT;
+
+ spa_node_port_set_io(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_IO_Buffers,
+ &data->source_sink_io[0], sizeof(data->source_sink_io[0]));
+ spa_node_port_set_io(data->sink,
+ SPA_DIRECTION_INPUT, 0,
+ SPA_IO_Buffers,
+ &data->source_sink_io[0], sizeof(data->source_sink_io[0]));
+
+ spa_graph_node_init(&data->source_node, &data->source_state);
+ spa_graph_node_set_callbacks(&data->source_node, &spa_graph_node_impl_default, data->source);
+ spa_graph_node_add(&data->graph, &data->source_node);
+ spa_graph_port_init(&data->source_out, SPA_DIRECTION_OUTPUT, 0, 0);
+ spa_graph_port_add(&data->source_node, &data->source_out);
+
+ spa_graph_node_init(&data->sink_node, &data->sink_state);
+ spa_graph_node_set_callbacks(&data->sink_node, &spa_graph_node_impl_default, data->sink);
+ spa_graph_node_add(&data->graph, &data->sink_node);
+ spa_graph_port_init(&data->sink_in, SPA_DIRECTION_INPUT, 0, 0);
+ spa_graph_port_add(&data->sink_node, &data->sink_in);
+
+ spa_graph_port_link(&data->source_out, &data->sink_in);
+
+ return res;
+}
+
+static int negotiate_formats(struct data *data)
+{
+ int res;
+ struct spa_pod *format;
+ struct spa_pod_builder b = { 0 };
+ uint8_t buffer[4096];
+
+ spa_pod_builder_init(&b, buffer, sizeof(buffer));
+ format = spa_format_audio_raw_build(&b, 0,
+ &SPA_AUDIO_INFO_RAW_INIT(
+ .format = SPA_AUDIO_FORMAT_S16,
+ .rate = 48000,
+ .channels = 2 ));
+
+ if ((res = spa_node_port_set_param(data->sink,
+ SPA_DIRECTION_INPUT, 0,
+ SPA_PARAM_Format, 0, format)) < 0)
+ return res;
+
+ if ((res = spa_node_port_set_param(data->source,
+ SPA_DIRECTION_OUTPUT, 0,
+ SPA_PARAM_Format, 0, format)) < 0)
+ return res;
+
+ init_buffer(data, data->source_buffers, data->source_buffer, 1, BUFFER_SIZE);
+ if ((res =
+ spa_node_port_use_buffers(data->sink,
+ SPA_DIRECTION_INPUT, 0, 0,
+ data->source_buffers, 1)) < 0)
+ return res;
+ if ((res =
+ spa_node_port_use_buffers(data->source,
+ SPA_DIRECTION_OUTPUT, 0, 0,
+ data->source_buffers, 1)) < 0)
+ return res;
+
+ return 0;
+}
+
+static void *loop(void *user_data)
+{
+ struct data *data = user_data;
+
+ printf("enter thread\n");
+ spa_loop_control_enter(data->control);
+
+ while (data->running) {
+ spa_loop_control_iterate(data->control, -1);
+ }
+
+ printf("leave thread\n");
+ spa_loop_control_leave(data->control);
+
+ return NULL;
+}
+
+static void run_async_sink(struct data *data)
+{
+ int res, err;
+ struct spa_command cmd;
+
+ cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Start);
+ if ((res = spa_node_send_command(data->sink, &cmd)) < 0)
+ printf("got error %d\n", res);
+
+ spa_loop_control_leave(data->control);
+
+ data->running = true;
+ if ((err = pthread_create(&data->thread, NULL, loop, data)) != 0) {
+ printf("can't create thread: %d %s", err, strerror(err));
+ data->running = false;
+ }
+
+ printf("sleeping for 1000 seconds\n");
+ sleep(1000);
+
+ if (data->running) {
+ data->running = false;
+ pthread_join(data->thread, NULL);
+ }
+
+ spa_loop_control_enter(data->control);
+
+ cmd = SPA_NODE_COMMAND_INIT(SPA_NODE_COMMAND_Pause);
+ if ((res = spa_node_send_command(data->sink, &cmd)) < 0)
+ printf("got error %d\n", res);
+}
+
+static int load_handle(struct data *data, struct spa_handle **handle, const char *lib, const char *name)
+{
+ int res;
+ void *hnd;
+ spa_handle_factory_enum_func_t enum_func;
+ uint32_t i;
+ char *path;
+
+ if ((path = spa_aprintf("%s/%s", data->plugin_dir, lib)) == NULL) {
+ return -ENOMEM;
+ }
+ if ((hnd = dlopen(path, RTLD_NOW)) == NULL) {
+ printf("can't load %s: %s\n", lib, dlerror());
+ free(path);
+ return -ENOENT;
+ }
+ free(path);
+ if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
+ printf("can't find enum function\n");
+ return -ENOENT;
+ }
+
+ for (i = 0;;) {
+ const struct spa_handle_factory *factory;
+
+ if ((res = enum_func(&factory, &i)) <= 0) {
+ if (res != 0)
+ printf("can't enumerate factories: %s\n", spa_strerror(res));
+ break;
+ }
+ if (factory->version < 1)
+ continue;
+ if (!spa_streq(factory->name, name))
+ continue;
+
+ *handle = calloc(1, spa_handle_factory_get_size(factory, NULL));
+ if ((res = spa_handle_factory_init(factory, *handle,
+ NULL, data->support,
+ data->n_support)) < 0) {
+ printf("can't make factory instance: %d\n", res);
+ return res;
+ }
+ return 0;
+ }
+ return -EBADF;
+}
+
+int init_data(struct data *data)
+{
+ int res;
+ const char *str;
+ struct spa_handle *handle = NULL;
+ void *iface;
+
+ if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
+ str = PLUGINDIR;
+ data->plugin_dir = str;
+
+ /* init the graph */
+ spa_graph_init(&data->graph, &data->graph_state);
+
+ /* set the default log */
+ data->log = &default_log.log;
+ data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Log, data->log);
+
+ /* load and set support system */
+ if ((res = load_handle(data, &handle,
+ "support/libspa-support.so",
+ SPA_NAME_SUPPORT_SYSTEM)) < 0)
+ return res;
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_System, &iface)) < 0) {
+ printf("can't get System interface %d\n", res);
+ return res;
+ }
+ data->system = iface;
+ data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_System, data->system);
+ data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataSystem, data->system);
+
+ /* load and set support loop and loop control */
+ if ((res = load_handle(data, &handle,
+ "support/libspa-support.so",
+ SPA_NAME_SUPPORT_LOOP)) < 0)
+ return res;
+
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Loop, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ data->loop = iface;
+ data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_Loop, data->loop);
+ data->support[data->n_support++] = SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_DataLoop, data->loop);
+ if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_LoopControl, &iface)) < 0) {
+ printf("can't get interface %d\n", res);
+ return res;
+ }
+ data->control = iface;
+
+ if ((str = getenv("SPA_DEBUG")))
+ data->log->level = atoi(str);
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ struct data data = { NULL };
+ int res;
+
+ if ((res = init_data(&data)) < 0) {
+ printf("can't init data: %d (%s)\n", res, spa_strerror(res));
+ return -1;
+ }
+
+ if ((res = make_nodes(&data, argc > 1 ? argv[1] : NULL)) < 0) {
+ printf("can't make nodes: %d (%s)\n", res, spa_strerror(res));
+ return -1;
+ }
+ if ((res = negotiate_formats(&data)) < 0) {
+ printf("can't negotiate nodes: %d (%s)\n", res, spa_strerror(res));
+ return -1;
+ }
+
+ spa_loop_control_enter(data.control);
+ run_async_sink(&data);
+ spa_loop_control_leave(data.control);
+
+ return 0;
+}
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