spa/examples/example-control.c

/* Spa */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
/*
 [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;
}
 
static 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;
}