spa/examples/adapter-control.c

Running audioadapter nodes.

Running audioadapter nodes.

Runs an output audioadapter using audiotestsrc as follower with an input audioadapter using alsa-pcm-sink as follower for easy testing.

/* Spa */
/* SPDX-FileCopyrightText: Copyright © 2020 Collabora Ltd. */
/* SPDX-License-Identifier: MIT */
 
/*
 [title]
 Running audioadapter nodes.
 [title]
 [doc]
 Runs an output audioadapter using audiotestsrc as follower
 with an input audioadapter using alsa-pcm-sink as follower
 for easy testing.
 [doc]
 */
 
#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 <getopt.h>
 
#include <spa/control/control.h>
#include <spa/graph/graph.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>
 
static SPA_LOG_IMPL(default_log);
 
#define MIN_LATENCY         1024
#define CONTROL_BUFFER_SIZE 32768
 
#define DEFAULT_RAMP_SAMPLES (64*1*1024)
#define DEFAULT_RAMP_STEP_SAMPLES 200
 
#define DEFAULT_RAMP_TIME 2000 // 2 seconds
#define DEFAULT_RAMP_STEP_TIME 5000 // 5 milli seconds
 
#define DEFAULT_DEVICE "hw:0,0"
 
#define LINEAR "linear"
#define CUBIC "cubic"
#define DEFAULT_SCALE SPA_AUDIO_VOLUME_RAMP_LINEAR
 
#define NON_NATIVE "non-native"
#define NATIVE "native"
#define DEFAULT_MODE NON_NATIVE
 
 
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 graph_source_node;
        struct spa_graph_node graph_sink_node;
        struct spa_graph_state graph_source_state;
        struct spa_graph_state graph_sink_state;
        struct spa_graph_port graph_source_port_0;
        struct spa_graph_port graph_sink_port_0;
 
        struct spa_node *source_follower_node;  // audiotestsrc
        struct spa_node *source_node;  // adapter for audiotestsrc
        struct spa_node *sink_follower_node;  // alsa-pcm-sink
        struct spa_node *sink_node;  // adapter for alsa-pcm-sink
 
        struct spa_io_position position;
        struct spa_io_buffers source_sink_io[1];
        struct spa_buffer *source_buffers[1];
        struct buffer source_buffer[1];
 
        struct spa_io_buffers control_io;
        struct spa_buffer *control_buffers[1];
        struct buffer control_buffer[1];
 
        int buffer_count;
        bool start_fade_in;
        double volume_accum;
        uint32_t volume_offs;
 
        const char *alsa_device;
 
        const char *mode;
        enum spa_audio_volume_ramp_scale scale;
 
        uint32_t volume_ramp_samples;
        uint32_t volume_ramp_step_samples;
        uint32_t volume_ramp_time;
        uint32_t volume_ramp_step_time;
 
        bool running;
        pthread_t thread;
};
 
static int load_handle (struct data *data, struct spa_handle **handle, const
        char *lib, const char *name, struct spa_dict *info)
{
        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;
 
        hnd = dlopen(path, RTLD_NOW);
        free(path);
 
        if (hnd == NULL) {
                printf("can't load %s: %s\n", lib, dlerror());
                return -ENOENT;
        }
        if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
                printf("can't find enum function\n");
                res = -ENOENT;
                goto exit_cleanup;
        }
 
        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,
                                                info, data->support,
                                                data->n_support)) < 0) {
                        printf("can't make factory instance: %d\n", res);
                        goto exit_cleanup;
                }
                return 0;
        }
        return -EBADF;
 
exit_cleanup:
        dlclose(hnd);
        return res;
}
 
static int init_data(struct data *data)
{
        int res;
        const char *str;
        struct spa_handle *handle = NULL;
        struct spa_dict_item items [2];
        struct spa_dict info;
        void *iface;
 
        if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
                str = PLUGINDIR;
        data->plugin_dir = str;
 
        /* start not doing fade-in */
        data->start_fade_in = true;
        data->volume_accum = 0.0;
        data->volume_offs = 0;
 
        /* init the graph */
        spa_graph_init(&data->graph, &data->graph_state);
 
        /* enable the debug messages in SPA */
        items [0] = SPA_DICT_ITEM_INIT(SPA_KEY_LOG_TIMESTAMP, "true");
        info = SPA_DICT_INIT(items, 1);
        if ((res = load_handle (data, &handle, "support/libspa-support.so",
                        SPA_NAME_SUPPORT_LOG, &info)) < 0)
                return res;
        if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Log, &iface)) < 0) {
                printf("can't get System interface %d\n", res);
                return res;
        }
        data->log = iface;
        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, NULL)) < 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, NULL)) < 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;
}
 
static int make_node(struct data *data, struct spa_node **node, const char *lib,
    const char *name, const struct spa_dict *props)
{
        struct spa_handle *handle;
        int res = 0;
        void *hnd = NULL;
        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;
 
        hnd = dlopen(path, RTLD_NOW);
        free(path);
 
        if (hnd == NULL) {
                printf("can't load %s: %s\n", lib, dlerror());
                return -ENOENT;
        }
        if ((enum_func = dlsym(hnd, SPA_HANDLE_FACTORY_ENUM_FUNC_NAME)) == NULL) {
                printf("can't find enum function\n");
                res = -ENOENT;
                goto exit_cleanup;
        }
 
        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, props, data->support,
                                             data->n_support)) < 0) {
                        printf("can't make factory instance: %d\n", res);
                        goto exit_cleanup;
                }
                if ((res = spa_handle_get_interface(handle, SPA_TYPE_INTERFACE_Node, &iface)) < 0) {
                        printf("can't get interface %d\n", res);
                        goto exit_cleanup;
                }
                *node = iface;
                return 0;
        }
        return -EBADF;
 
exit_cleanup:
        dlclose(hnd);
        return res;
}
 
static int get_ramp_samples(struct data *data)
{
        int samples = -1;
        if (data->volume_ramp_samples)
                samples = data->volume_ramp_samples;
        else if (data->volume_ramp_time) {
                samples = (data->volume_ramp_time * 48000) / 1000;
        }
        if (!samples)
                samples = -1;
 
        return samples;
}
 
static int get_ramp_step_samples(struct data *data)
{
        int samples = -1;
        if (data->volume_ramp_step_samples)
                samples = data->volume_ramp_step_samples;
        else if (data->volume_ramp_step_time) {
                /* convert the step time which is in nano seconds to seconds */
                samples = (data->volume_ramp_step_time / 1000) * (48000 / 1000);
        }
        if (!samples)
                samples = -1;
 
        return samples;
}
 
static double get_volume_at_scale(struct data *data)
{
        if (data->scale == SPA_AUDIO_VOLUME_RAMP_LINEAR)
                return data->volume_accum;
        else if (data->scale == SPA_AUDIO_VOLUME_RAMP_CUBIC)
                return (data->volume_accum * data->volume_accum * data->volume_accum);
 
        return 0.0;
}
 
static int fade_in(struct data *data)
{
        printf("fading in\n");
        if (spa_streq (data->mode, NON_NATIVE)) {
                struct spa_pod_builder b;
                struct spa_pod_frame f[1];
                void *buffer = data->control_buffer->datas[0].data;
                int ramp_samples = get_ramp_samples(data);
                int ramp_step_samples = get_ramp_step_samples(data);
                double step_size = ((double) ramp_step_samples / (double) ramp_samples);
                uint32_t buffer_size = data->control_buffer->datas[0].maxsize;
                data->control_buffer->datas[0].chunk[0].size = buffer_size;
 
                spa_pod_builder_init(&b, buffer, buffer_size);
                spa_pod_builder_push_sequence(&b, &f[0], 0);
                data->volume_offs = 0;
                do {
                        // printf("volume level %f offset %d\n", get_volume_at_scale(data), data->volume_offs);
                        spa_pod_builder_control(&b, data->volume_offs, SPA_CONTROL_Properties);
                        spa_pod_builder_add_object(&b,
                                SPA_TYPE_OBJECT_Props, 0,
                                SPA_PROP_volume, SPA_POD_Float(get_volume_at_scale(data)));
                        data->volume_accum += step_size;
                        data->volume_offs += ramp_step_samples;
                } while (data->volume_accum < 1.0);
                spa_pod_builder_pop(&b, &f[0]);
        }
        else {
                struct spa_pod_builder b;
                struct spa_pod *props;
                int res = 0;
                uint8_t buffer[1024];
                spa_pod_builder_init(&b, buffer, sizeof(buffer));
                props = spa_pod_builder_add_object(&b,
                        SPA_TYPE_OBJECT_Props, 0,
                        SPA_PROP_volume, SPA_POD_Float(1.0),
                        SPA_PROP_volumeRampSamples, SPA_POD_Int(data->volume_ramp_samples),
                        SPA_PROP_volumeRampStepSamples, SPA_POD_Int(data->volume_ramp_step_samples),
                        SPA_PROP_volumeRampTime, SPA_POD_Int(data->volume_ramp_time),
                        SPA_PROP_volumeRampStepTime, SPA_POD_Int(data->volume_ramp_step_time),
                        SPA_PROP_volumeRampScale, SPA_POD_Id(data->scale));
                if ((res = spa_node_set_param(data->sink_node, SPA_PARAM_Props, 0, props)) < 0) {
                        printf("can't call volramp set params %d\n", res);
                        return res;
                }
        }
 
        return 0;
}
 
static int fade_out(struct data *data)
{
        printf("fading out\n");
        if (spa_streq (data->mode, NON_NATIVE)) {
                struct spa_pod_builder b;
                struct spa_pod_frame f[1];
                int ramp_samples = get_ramp_samples(data);
                int ramp_step_samples = get_ramp_step_samples(data);
                double step_size = ((double) ramp_step_samples / (double) ramp_samples);
 
 
                void *buffer = data->control_buffer->datas[0].data;
                uint32_t buffer_size = data->control_buffer->datas[0].maxsize;
                data->control_buffer->datas[0].chunk[0].size = buffer_size;
 
                spa_pod_builder_init(&b, buffer, buffer_size);
                spa_pod_builder_push_sequence(&b, &f[0], 0);
                data->volume_offs = ramp_step_samples;
                do {
                        // printf("volume level %f offset %d\n", get_volume_at_scale(data), data->volume_offs);
                        spa_pod_builder_control(&b, data->volume_offs, SPA_CONTROL_Properties);
                        spa_pod_builder_add_object(&b,
                                SPA_TYPE_OBJECT_Props, 0,
                                SPA_PROP_volume, SPA_POD_Float(get_volume_at_scale(data)));
                        data->volume_accum -= step_size;
                        data->volume_offs += ramp_step_samples;
                } while (data->volume_accum > 0.0);
                spa_pod_builder_pop(&b, &f[0]);
        } else {
                struct spa_pod_builder b;
                uint8_t buffer[1024];
                struct spa_pod *props;
                int res = 0;
 
                spa_pod_builder_init(&b, buffer, sizeof(buffer));
                props = spa_pod_builder_add_object(&b,
                        SPA_TYPE_OBJECT_Props, 0,
                        SPA_PROP_volume, SPA_POD_Float(0.0),
                        SPA_PROP_volumeRampSamples, SPA_POD_Int(data->volume_ramp_samples),
                        SPA_PROP_volumeRampStepSamples, SPA_POD_Int(data->volume_ramp_step_samples),
                        SPA_PROP_volumeRampTime, SPA_POD_Int(data->volume_ramp_time),
                        SPA_PROP_volumeRampStepTime, SPA_POD_Int(data->volume_ramp_step_time),
                        SPA_PROP_volumeRampScale, SPA_POD_Id(data->scale));
                if ((res = spa_node_set_param(data->sink_node, SPA_PARAM_Props, 0, props)) < 0) {
                        printf("can't call volramp set params %d\n", res);
                        return res;
                }
        }
 
        return 0;
}
 
static void do_fade(struct data *data)
{
        if (spa_streq (data->mode, NON_NATIVE)) {
                switch (data->control_io.status) {
                case SPA_STATUS_OK:
                case SPA_STATUS_NEED_DATA:
                        break;
                case SPA_STATUS_HAVE_DATA:
                case SPA_STATUS_STOPPED:
                default:
                        return;
                }
        }
 
        /* fade */
        if (data->start_fade_in)
                fade_in(data);
        else
                fade_out(data);
 
        if (spa_streq (data->mode, NON_NATIVE)) {
                data->control_io.status = SPA_STATUS_HAVE_DATA;
                data->control_io.buffer_id = 0;
        }
 
        /* alternate */
        data->start_fade_in = !data->start_fade_in;
}
 
static int on_sink_node_ready(void *_data, int status)
{
        struct data *data = _data;
        int runway = (get_ramp_samples(data) / 1024);
 
        /* only do fade in/out when buffer count is 0 */
        if (data->buffer_count == 0)
                do_fade(data);
 
        /* update buffer count */
        data->buffer_count++;
        if (data->buffer_count > (runway * 2))
                  data->buffer_count = 0;
 
        spa_graph_node_process(&data->graph_source_node);
        spa_graph_node_process(&data->graph_sink_node);
        return 0;
}
 
static const struct spa_node_callbacks sink_node_callbacks = {
        SPA_VERSION_NODE_CALLBACKS,
        .ready = on_sink_node_ready,
};
 
static int make_nodes(struct data *data)
{
        int res = 0;
        struct spa_pod *props;
        struct spa_pod_builder b = { 0 };
        uint8_t buffer[1024];
        char value[32];
        struct spa_dict_item items[2];
        struct spa_audio_info_raw info;
        struct spa_pod *param;
        float initial_volume = 0.0;
 
        items[0] = SPA_DICT_ITEM_INIT("clock.quantum-limit", "8192");
 
        /* make the source node (audiotestsrc) */
        if ((res = make_node(data, &data->source_follower_node,
                                        "audiotestsrc/libspa-audiotestsrc.so",
                                        "audiotestsrc",
                                        &SPA_DICT_INIT(items, 1))) < 0) {
                printf("can't create source follower node (audiotestsrc): %d\n", res);
                return res;
        }
        printf("created source follower node %p\n", data->source_follower_node);
 
        /* set the format on the source */
        spa_pod_builder_init(&b, buffer, sizeof(buffer));
        param = 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->source_follower_node,
                                           SPA_DIRECTION_OUTPUT, 0,
                                           SPA_PARAM_Format, 0, param)) < 0) {
                printf("can't set format on follower node (audiotestsrc): %d\n", res);
                return res;
        }
 
        /* make the source adapter node */
        snprintf(value, sizeof(value), "pointer:%p", data->source_follower_node);
        items[1] = SPA_DICT_ITEM_INIT("audio.adapt.follower", value);
        if ((res = make_node(data, &data->source_node,
                                        "audioconvert/libspa-audioconvert.so",
                                        SPA_NAME_AUDIO_ADAPT,
                                        &SPA_DICT_INIT(items, 2))) < 0) {
                printf("can't create source adapter node: %d\n", res);
                return res;
        }
        printf("created source adapter node %p\n", data->source_node);
 
        /* setup the source node props */
        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_node, SPA_PARAM_Props, 0, props)) < 0) {
                printf("can't setup source follower node %d\n", res);
                return res;
        }
 
        /* setup the source node port config */
        spa_zero(info);
        info.format = SPA_AUDIO_FORMAT_F32P;
        info.channels = 1;
        info.rate = 48000;
        info.position[0] = SPA_AUDIO_CHANNEL_MONO;
        spa_pod_builder_init(&b, buffer, sizeof(buffer));
        param = spa_format_audio_raw_build(&b, SPA_PARAM_Format, &info);
        param = spa_pod_builder_add_object(&b,
                SPA_TYPE_OBJECT_ParamPortConfig,        SPA_PARAM_PortConfig,
                SPA_PARAM_PORT_CONFIG_direction,        SPA_POD_Id(SPA_DIRECTION_OUTPUT),
                SPA_PARAM_PORT_CONFIG_mode,             SPA_POD_Id(SPA_PARAM_PORT_CONFIG_MODE_dsp),
                SPA_PARAM_PORT_CONFIG_format,           SPA_POD_Pod(param));
        if ((res = spa_node_set_param(data->source_node, SPA_PARAM_PortConfig, 0, param) < 0)) {
                printf("can't setup source node %d\n", res);
                return res;
        }
 
        /* make the sink follower node (alsa-pcm-sink) */
        if ((res = make_node(data, &data->sink_follower_node,
                                        "alsa/libspa-alsa.so",
                                        SPA_NAME_API_ALSA_PCM_SINK,
                                        &SPA_DICT_INIT(items, 1))) < 0) {
                printf("can't create sink follower node (alsa-pcm-sink): %d\n", res);
                return res;
        }
        printf("created sink follower node %p\n", data->sink_follower_node);
 
        /* make the sink adapter node */
        snprintf(value, sizeof(value), "pointer:%p", data->sink_follower_node);
        items[1] = SPA_DICT_ITEM_INIT("audio.adapt.follower", value);
        if ((res = make_node(data, &data->sink_node,
                                        "audioconvert/libspa-audioconvert.so",
                                        SPA_NAME_AUDIO_ADAPT,
                                        &SPA_DICT_INIT(items, 2))) < 0) {
                printf("can't create sink adapter node: %d\n", res);
                return res;
        }
        printf("created sink adapter node %p\n", data->sink_node);
 
        /* add sink follower node callbacks */
        spa_node_set_callbacks(data->sink_node, &sink_node_callbacks, data);
 
        /* setup the sink node props */
        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(data->alsa_device),
                SPA_PROP_minLatency, SPA_POD_Int(MIN_LATENCY));
        if ((res = spa_node_set_param(data->sink_follower_node, SPA_PARAM_Props, 0, props)) < 0) {
                printf("can't setup sink follower node %d\n", res);
                return res;
        }
        printf("Selected (%s) alsa device\n", data->alsa_device);
 
        if (!data->start_fade_in)
                initial_volume = 1.0;
 
        /* setup the sink node port config */
        spa_zero(info);
        info.format = SPA_AUDIO_FORMAT_F32P;
        info.channels = 1;
        info.rate = 48000;
        info.position[0] = SPA_AUDIO_CHANNEL_MONO;
        spa_pod_builder_init(&b, buffer, sizeof(buffer));
        param = spa_format_audio_raw_build(&b, SPA_PARAM_Format, &info);
 
        if (spa_streq (data->mode, NON_NATIVE))
                param = spa_pod_builder_add_object(&b,
                        SPA_TYPE_OBJECT_ParamPortConfig, SPA_PARAM_PortConfig,
                        SPA_PARAM_PORT_CONFIG_direction, SPA_POD_Id(SPA_DIRECTION_INPUT),
                        SPA_PARAM_PORT_CONFIG_mode, SPA_POD_Id(SPA_PARAM_PORT_CONFIG_MODE_dsp),
                        SPA_PARAM_PORT_CONFIG_control, SPA_POD_Bool(true),
                        SPA_PARAM_PORT_CONFIG_format, SPA_POD_Pod(param));
        else
                param = spa_pod_builder_add_object(&b,
                        SPA_TYPE_OBJECT_ParamPortConfig, SPA_PARAM_PortConfig,
                        SPA_PARAM_PORT_CONFIG_direction, SPA_POD_Id(SPA_DIRECTION_INPUT),
                        SPA_PARAM_PORT_CONFIG_mode, SPA_POD_Id(SPA_PARAM_PORT_CONFIG_MODE_dsp),
                        SPA_PARAM_PORT_CONFIG_format, SPA_POD_Pod(param));
 
 
        if ((res = spa_node_set_param(data->sink_node, SPA_PARAM_PortConfig, 0, param) < 0)) {
                printf("can't setup sink node %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_volume, SPA_POD_Float(initial_volume));
        if ((res = spa_node_set_param(data->sink_node, SPA_PARAM_Props, 0, props)) < 0) {
                printf("can't configure initial volume %d\n", res);
                return res;
        }
 
        /* set io buffers on source and sink nodes */
        data->source_sink_io[0] = SPA_IO_BUFFERS_INIT;
        if ((res = spa_node_port_set_io(data->source_node,
                        SPA_DIRECTION_OUTPUT, 0,
                        SPA_IO_Buffers,
                        &data->source_sink_io[0], sizeof(data->source_sink_io[0]))) < 0) {
                printf("can't set io buffers on port 0 of source node: %d\n", res);
                return res;
        }
        printf("set io buffers on port 0 of source node %p\n", data->source_node);
 
 
        if ((res = spa_node_port_set_io(data->sink_node,
                          SPA_DIRECTION_INPUT, 0,
                          SPA_IO_Buffers,
                          &data->source_sink_io[0], sizeof(data->source_sink_io[0]))) < 0) {
                printf("can't set io buffers on port 0 of sink node: %d\n", res);
                return res;
        }
        printf("set io buffers on port 0 of sink node %p\n", data->sink_node);
 
        /* set io position and clock on source and sink nodes */
        data->position.clock.target_rate = SPA_FRACTION(1, 48000);
        data->position.clock.target_duration = 1024;
        data->position.clock.rate = data->position.clock.target_rate;
        data->position.clock.duration = data->position.clock.target_duration;
        if ((res = spa_node_set_io(data->source_node,
                        SPA_IO_Position,
                        &data->position, sizeof(data->position))) < 0) {
                printf("can't set io position on source node: %d\n", res);
                return res;
        }
        if ((res = spa_node_set_io(data->sink_node,
                          SPA_IO_Position,
                          &data->position, sizeof(data->position))) < 0) {
                printf("can't set io position on sink node: %d\n", res);
                return res;
        }
        if ((res = spa_node_set_io(data->source_node,
                        SPA_IO_Clock,
                        &data->position.clock, sizeof(data->position.clock))) < 0) {
                printf("can't set io clock on source node: %d\n", res);
                return res;
        }
        if ((res = spa_node_set_io(data->sink_node,
                          SPA_IO_Clock,
                          &data->position.clock, sizeof(data->position.clock))) < 0) {
                printf("can't set io clock on sink node: %d\n", res);
                return res;
        }
 
        if (spa_streq (data->mode, NON_NATIVE)) {
                /* set io buffers on control port of sink node */
                if ((res = spa_node_port_set_io(data->sink_node,
                        SPA_DIRECTION_INPUT, 1,
                        SPA_IO_Buffers,
                        &data->control_io, sizeof(data->control_io))) < 0) {
                        printf("can't set io buffers on control port 1 of sink node\n");
                        return res;
                }
        }
        /* add source node to the graph */
        spa_graph_node_init(&data->graph_source_node, &data->graph_source_state);
        spa_graph_node_set_callbacks(&data->graph_source_node, &spa_graph_node_impl_default, data->source_node);
        spa_graph_node_add(&data->graph, &data->graph_source_node);
        spa_graph_port_init(&data->graph_source_port_0, SPA_DIRECTION_OUTPUT, 0, 0);
        spa_graph_port_add(&data->graph_source_node, &data->graph_source_port_0);
 
        /* add sink node to the graph */
        spa_graph_node_init(&data->graph_sink_node, &data->graph_sink_state);
        spa_graph_node_set_callbacks(&data->graph_sink_node, &spa_graph_node_impl_default, data->sink_node);
        spa_graph_node_add(&data->graph, &data->graph_sink_node);
        spa_graph_port_init(&data->graph_sink_port_0, SPA_DIRECTION_INPUT, 0, 0);
        spa_graph_port_add(&data->graph_sink_node, &data->graph_sink_port_0);
 
        /* link source and sink nodes */
        spa_graph_port_link(&data->graph_source_port_0, &data->graph_sink_port_0);
 
        return res;
}
 
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 negotiate_formats(struct data *data)
{
        int res;
        struct spa_pod *filter = NULL, *param = NULL;
        struct spa_pod_builder b = { 0 };
        uint8_t buffer[4096];
        uint32_t state = 0;
        size_t buffer_size = 1024;
 
        /* set the sink and source formats */
        spa_pod_builder_init(&b, buffer, sizeof(buffer));
        param = spa_format_audio_dsp_build(&b, 0,
                &SPA_AUDIO_INFO_DSP_INIT(
                        .format = SPA_AUDIO_FORMAT_F32P));
        if ((res = spa_node_port_set_param(data->source_node,
                        SPA_DIRECTION_OUTPUT, 0, SPA_PARAM_Format, 0, param)) < 0) {
                printf("can't set format on source node: %d\n", res);
                return res;
        }
        if ((res = spa_node_port_set_param(data->sink_node,
                        SPA_DIRECTION_INPUT, 0, SPA_PARAM_Format, 0, param)) < 0) {
                printf("can't set format on source node: %d\n", res);
                return res;
        }
 
        if (spa_streq (data->mode, NON_NATIVE)) {
                spa_pod_builder_init(&b, buffer, sizeof(buffer));
                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));
                if ((res = spa_node_port_set_param(data->sink_node,
                        SPA_DIRECTION_INPUT, 1, SPA_PARAM_Format, 0, param)) < 0) {
                        printf("can't set format on control port of source node: %d\n", res);
                        return res;
                }
        }
 
        /* get the source node buffer size */
        spa_pod_builder_init(&b, buffer, sizeof(buffer));
        if ((res = spa_node_port_enum_params_sync(data->source_node,
                        SPA_DIRECTION_OUTPUT, 0,
                        SPA_PARAM_Buffers, &state, filter, &param, &b)) != 1)
                return res ? res : -ENOTSUP;
        spa_pod_fixate(param);
        if ((res = spa_pod_parse_object(param, SPA_TYPE_OBJECT_ParamBuffers, NULL,
                SPA_PARAM_BUFFERS_size, SPA_POD_Int(&buffer_size))) < 0)
                return res;
 
        /* use buffers on the source and sink */
        init_buffer(data, data->source_buffers, data->source_buffer, 1, buffer_size);
        if ((res = spa_node_port_use_buffers(data->source_node,
                SPA_DIRECTION_OUTPUT, 0, 0, data->source_buffers, 1)) < 0)
                return res;
        printf("allocated and assigned buffer (%zu) to source node %p\n", buffer_size, data->source_node);
        if ((res = spa_node_port_use_buffers(data->sink_node,
                SPA_DIRECTION_INPUT, 0, 0, data->source_buffers, 1)) < 0)
                return res;
        printf("allocated and assigned buffers to sink node %p\n", data->sink_node);
 
        if (spa_streq (data->mode, NON_NATIVE)) {
                /* Set the control buffers */
                init_buffer(data, data->control_buffers, data->control_buffer, 1, CONTROL_BUFFER_SIZE);
                if ((res = spa_node_port_use_buffers(data->sink_node,
                        SPA_DIRECTION_INPUT, 1, 0, data->control_buffers, 1)) < 0)
                        return res;
                printf("allocated and assigned control buffers(%d) to sink node %p\n", CONTROL_BUFFER_SIZE, data->sink_node);
        }
 
        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;
 
        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->source_node, &cmd)) < 0)
                printf("got error %d\n", res);
        printf("Source node started\n");
        if ((res = spa_node_send_command(data->sink_node, &cmd)) < 0)
                printf("got error %d\n", res);
        printf("sink node started\n");
 
        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->source_node, &cmd)) < 0)
                printf("got error %d\n", res);
        if ((res = spa_node_send_command(data->sink_node, &cmd)) < 0)
                printf("got error %d\n", res);
}
 
static const char *getscale(uint32_t scale)
{
        const char *scale_s = NULL;
 
        if (scale == SPA_AUDIO_VOLUME_RAMP_LINEAR)
                scale_s = LINEAR;
        else if (scale == SPA_AUDIO_VOLUME_RAMP_CUBIC)
                scale_s = CUBIC;
 
        return scale_s;
}
static void show_help(struct data *data, const char *name, bool error)
{
        fprintf(error ? stderr : stdout, "%s [options] [command]\n"
                "  -h, --help              Show this help\n"
                "  -d, --alsa-device       ALSA device(\"aplay -l\" for more info) to play the samples on(default %s)\n"
                "  -m, --mode              Volume Ramp Mode(\"NonNative\"(via Control Port) \"Native\" (via Volume Ramp Params of AudioAdapter plugin)) (default %s)\n"
                "  -s, --ramp-samples      SPA_PROP_volumeRampSamples(Samples to ramp the volume over)(default %d)\n"
                "  -a, --ramp-step-samples SPA_PROP_volumeRampStepSamples(Step or incremental Samples to ramp the volume over)(default %d)\n"
                "  -t, --ramp-time         SPA_PROP_volumeRampTime(Time to ramp the volume over in  msec)(default %d)\n"
                "  -i, --ramp-step-time    SPA_PROP_volumeRampStepTime(Step or incremental Time to ramp the volume over in nano sec)(default %d)\n"
                "  -c, --scale             SPA_PROP_volumeRampScale(the scale or graph to used to ramp the volume)(\"linear\" or \"cubic\")(default %s)\n"
                "examples:\n"
                "adapter-control\n"
                "-->when invoked with out any params, ramps volume with default values\n"
                "adapter-control --ramp-samples=70000, rest of the parameters are defaults\n"
                "-->ramps volume over 70000 samples(it is 1.45 seconds)\n"
                "adapter-control --alsa-device=hw:0,0 --ramp-samples=70000\n"
                "-->ramps volume on \"hw:0,0\" alsa device over 70000 samples\n"
                "adapter-control --alsa-device=hw:0,0 --ramp-samples=70000 --mode=native\n"
                "-->ramps volume on \"hw:0,0\" alsa device over 70000 samples in native mode\n"
                "adapter-control --alsa-device=hw:0,0 --ramp-time=1000 --mode=native\n"
                "-->ramps volume on \"hw:0,0\" alsa device over 1000 msec in native mode\n"
                "adapter-control --alsa-device=hw:0,0 --ramp-time=1000 --ramp-step-time=5000 --mode=native\n"
                "-->ramps volume on \"hw:0,0\" alsa device over 1000 msec in steps of 5000 nano seconds(5 msec)in native mode\n"
                "adapter-control --alsa-device=hw:0,0 --ramp-samples=70000 --ramp-step-samples=200 --mode=native\n"
                "-->ramps volume on \"hw:0,0\" alsa device over 70000 samples with a step size of 200 samples in native mode\n"
                "adapter-control --alsa-device=hw:1,0 --scale=linear\n"
                "-->ramps volume on \"hw:1,0\" in linear volume scale, one can leave choose to not use the linear scale here as it is the default\n"
                "adapter-control --alsa-device=hw:1,0 --ramp-samples=70000 --scale=cubic\n"
                "-->ramps volume on \"hw:1,0\" alsa device over 70000 samples deploying cubic volume scale\n"
                "adapter-control --alsa-device=hw:1,0 --ramp-samples=70000 --mode=native --scale=cubic\n"
                "-->ramps volume on \"hw:1,0\" alsa device over 70000 samples deploying cubic volume scale in native mode\n"
                "adapter-control --alsa-device=hw:1,0 --ramp-time=3000 --scale=cubic --mode=native\n"
                "-->ramps volume on \"hw:1,0\" alsa device over 3 seconds samples with a step size of 200 samples in native mode\n",
                name,
                DEFAULT_DEVICE,
                DEFAULT_MODE,
                DEFAULT_RAMP_SAMPLES,
                DEFAULT_RAMP_STEP_SAMPLES,
                DEFAULT_RAMP_TIME,
                DEFAULT_RAMP_STEP_TIME,
                getscale(DEFAULT_SCALE));
}
 
int main(int argc, char *argv[])
{
        struct data data = { 0 };
        int res = 0, c;
 
        /* default values*/
        data.volume_ramp_samples = DEFAULT_RAMP_SAMPLES;
        data.volume_ramp_step_samples = DEFAULT_RAMP_STEP_SAMPLES;
        data.alsa_device = DEFAULT_DEVICE;
        data.mode = DEFAULT_MODE;
        data.scale = DEFAULT_SCALE;
 
        static const struct option long_options[] = {
        { "help",               no_argument,            NULL, 'h' },
        { "alsa-device",        required_argument,      NULL, 'd' },
        { "mode",               required_argument,      NULL, 'm' },
        { "ramp-samples",       required_argument,      NULL, 's' },
        { "ramp-time",          required_argument,      NULL, 't' },
        { "ramp-step-samples",  required_argument,      NULL, 'a' },
        { "ramp-step-time",     required_argument,      NULL, 'i' },
        { "scale",              required_argument,      NULL, 'c' },
        { NULL, 0, NULL, 0}
        };
 
        setlocale(LC_ALL, "");
 
        while ((c = getopt_long(argc, argv, "hdmstiac:", long_options, NULL)) != -1) {
                switch (c) {
                case 'h':
                        show_help(&data, argv[0], false);
                        return 0;
                case 'm':
                        if (!spa_streq (optarg, NATIVE) && !spa_streq (optarg, NON_NATIVE))
                                printf("Invalid Mode(\"%s\"), using default(\"%s\")\n", optarg, DEFAULT_MODE);
                        else
                                data.mode = optarg;
                        break;
                case 'c':
                        if (!spa_streq (optarg, LINEAR) && !spa_streq (optarg, CUBIC))
                                printf("Invalid Scale(\"%s\"), using default(\"%s\")\n", optarg,
                                                getscale(DEFAULT_SCALE));
                        else
                                if (spa_streq (optarg, LINEAR))
                                        data.scale = SPA_AUDIO_VOLUME_RAMP_LINEAR;
                                else if (spa_streq (optarg, CUBIC))
                                        data.scale = SPA_AUDIO_VOLUME_RAMP_CUBIC;
                        break;
                case 'd':
                        data.alsa_device = optarg;
                        break;
                case 's':
                        data.volume_ramp_samples = atoi(optarg);
                        break;
                case 't':
                        data.volume_ramp_time = atoi(optarg);
                        if (!data.volume_ramp_step_time)
                                data.volume_ramp_step_time = DEFAULT_RAMP_STEP_TIME;
                        data.volume_ramp_samples = 0;
                        data.volume_ramp_step_samples = 0;
                        break;
                case 'a':
                        data.volume_ramp_step_samples = atoi(optarg);
                        break;
                case 'i':
                        data.volume_ramp_step_time = atoi(optarg);
                        break;
                default:
                        show_help(&data, argv[0], true);
                        return -1;
                }
        }
 
 
        /* init data */
        if ((res = init_data(&data)) < 0) {
          printf("can't init data: %d (%s)\n", res, spa_strerror(res));
          return -1;
        }
 
        /* make the nodes (audiotestsrc and adapter with alsa-pcm-sink as follower) */
        if ((res = make_nodes(&data)) < 0) {
          printf("can't make nodes: %d (%s)\n", res, spa_strerror(res));
                return -1;
        }
 
        /* Negotiate format */
        if ((res = negotiate_formats(&data)) < 0) {
                printf("can't negotiate nodes: %d (%s)\n", res, spa_strerror(res));
                return -1;
        }
 
        printf("using %s mode\n", data.mode);
        if (data.volume_ramp_samples && data.volume_ramp_step_samples)
                printf("using %d samples with a step size of %d samples to ramp volume at %s scale\n",
                        data.volume_ramp_samples, data.volume_ramp_step_samples, getscale(data.scale));
        else if (data.volume_ramp_time && data.volume_ramp_step_time)
                printf("using %d msec with a step size of %d msec to ramp volume at %s scale\n",
                        data.volume_ramp_time, (data.volume_ramp_step_time/1000), getscale(data.scale));
 
        spa_loop_control_enter(data.control);
        run_async_sink(&data);
        spa_loop_control_leave(data.control);
}