initial pipewire setup
- setup audio in/out and midi in ports - dump incoming midi messages
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2 changed files with 195 additions and 0 deletions
188
guitfx.c
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188
guitfx.c
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#include "pipewire/keys.h"
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#include "pipewire/port.h"
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#include "spa/pod/iter.h"
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#include "spa/utils/defs.h"
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#include <stdio.h>
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#include <signal.h>
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#include <spa/pod/pod.h>
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#include <spa/pod/builder.h>
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#include <spa/control/control.h>
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#include <spa/param/latency-utils.h>
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#include <pipewire/pipewire.h>
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#include <pipewire/filter.h>
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struct data;
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struct port {
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struct data *data;
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};
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struct data {
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struct pw_main_loop *loop;
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struct pw_filter *filter;
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struct port *in_port;
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struct port *midi_in_port;
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struct port *out_port;
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//! elapsed time in number of samples
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uint64_t time;
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};
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static void on_process(void *userdata, struct spa_io_position *position)
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{
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struct data *data = userdata;
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float *in, *out;
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uint32_t n_samples = position->clock.duration;
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uint64_t frame = data->time;
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data->time += n_samples;
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//printf("do process (%d samples) at %u\n", n_samples, frame);
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struct pw_buffer * b = pw_filter_dequeue_buffer(data->midi_in_port);
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if( b == NULL ) {
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fprintf(stderr, "on_process(): no buffer for midi_in_port\n");
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return;
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}
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struct spa_buffer * buf = b->buffer;
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spa_assert(buf->n_datas == 1);
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struct spa_data * d = &buf->datas[0];
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if( d->data ) {
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struct spa_pod * pod =
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spa_pod_from_data(
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d->data,
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d->maxsize,
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d->chunk->offset,
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d->chunk->size
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);
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if( pod ) {
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if( spa_pod_is_sequence(pod) ) {
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struct spa_pod_sequence * pod_seq = (struct spa_pod_sequence*) pod;
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struct spa_pod_control * c;
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SPA_POD_SEQUENCE_FOREACH(pod_seq, c) {
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if( c->type == SPA_CONTROL_Midi ) {
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unsigned sec =
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(frame + c->offset)
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/ (float) position->clock.rate.denom;
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char * data = SPA_POD_BODY(&c->value);
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unsigned size = SPA_POD_BODY_SIZE(&c->value);
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printf("[%d] MIDI message (%d bytes) : %x, %x, %x\n", sec, size, data[0], data[1], data[2]);
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} else {
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printf("on_process(): non midi-control\n");
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}
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}
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} else {
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fprintf(stderr, "on_process(): unexpected POD that is not a sequence (midi_in_port)\n");
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}
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} else {
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fprintf(stderr, "on_process(): pod is NULL\n");
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}
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} else {
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fprintf(stderr, "on_process(): no data in buffer of midi_in_port\n");
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}
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pw_filter_queue_buffer(data->midi_in_port, b);
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in = pw_filter_get_dsp_buffer(data->in_port, n_samples);
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out = pw_filter_get_dsp_buffer(data->out_port, n_samples);
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if( in && out ) {
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memcpy(out, in, n_samples * sizeof(float));
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}
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}
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static const struct pw_filter_events filter_events = {
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PW_VERSION_FILTER_EVENTS,
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.process = on_process,
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};
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static void do_quit(void *userdata, int signal_number)
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{
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struct data *data = userdata;
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pw_main_loop_quit(data->loop);
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}
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int main(int argc, char *argv[])
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{
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struct data data = { 0, };
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const struct spa_pod *params[1];
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uint8_t buffer[1024];
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struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
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pw_init(&argc, &argv);
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data.loop = pw_main_loop_new(NULL);
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pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data);
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pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
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data.filter = pw_filter_new_simple(
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pw_main_loop_get_loop(data.loop),
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"Guitar FX",
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pw_properties_new(
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PW_KEY_MEDIA_TYPE, "Audio",
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PW_KEY_MEDIA_CATEGORY, "Filter",
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PW_KEY_MEDIA_ROLE, "DSP",
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NULL),
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&filter_events,
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&data);
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data.midi_in_port = pw_filter_add_port(data.filter,
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PW_DIRECTION_INPUT,
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PW_FILTER_PORT_FLAG_MAP_BUFFERS,
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sizeof(struct port),
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pw_properties_new(
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PW_KEY_FORMAT_DSP, "8 bit raw midi",
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PW_KEY_PORT_NAME, "midi-input",
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NULL
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),
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NULL, 0
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);
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data.in_port = pw_filter_add_port(data.filter,
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PW_DIRECTION_INPUT,
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PW_FILTER_PORT_FLAG_MAP_BUFFERS,
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sizeof(struct port),
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pw_properties_new(
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PW_KEY_FORMAT_DSP, "32 bit float mono audio",
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PW_KEY_PORT_NAME, "guitar input",
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NULL),
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NULL, 0);
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data.out_port = pw_filter_add_port(data.filter,
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PW_DIRECTION_OUTPUT,
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PW_FILTER_PORT_FLAG_MAP_BUFFERS,
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sizeof(struct port),
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pw_properties_new(
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PW_KEY_FORMAT_DSP, "32 bit float mono audio",
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PW_KEY_PORT_NAME, "guitar output",
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NULL),
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NULL, 0);
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params[0] = spa_process_latency_build(&b,
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SPA_PARAM_ProcessLatency,
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&SPA_PROCESS_LATENCY_INFO_INIT(
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.ns = 10 * SPA_NSEC_PER_MSEC
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));
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if (pw_filter_connect(data.filter,
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PW_FILTER_FLAG_RT_PROCESS,
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params, 1) < 0) {
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fprintf(stderr, "can't connect\n");
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return -1;
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}
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pw_main_loop_run(data.loop);
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pw_filter_destroy(data.filter);
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pw_main_loop_destroy(data.loop);
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pw_deinit();
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return 0;
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}
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7
meson.build
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7
meson.build
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@ -0,0 +1,7 @@
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project('guitfx', 'c')
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pipewire_dep = dependency('libpipewire-0.3')
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executable(
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'guitfx',
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'guitfx.c',
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dependencies : [pipewire_dep],
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)
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