initial commit, working basics.
- loads a hard-coded hydrogen kit - repsonds to midi - no individual control - no gui
This commit is contained in:
Nick Lanham
228
drmr.c
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228
drmr.c
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/*
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LV2 DrMr plugin
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Copyright 2012 Nick Lanham <nick@afternight.org>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "drmr.h"
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int load_sample(char* path, drmr_sample* samp) {
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SNDFILE* sndf;
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int size;
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printf("Loading: %s\n",path);
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samp->active = 0;
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memset(&(samp->info),0,sizeof(SF_INFO));
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sndf = sf_open(path,SFM_READ,&(samp->info));
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if (!sndf) {
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fprintf(stderr,"Failed to open sound file: %s\n",sf_strerror(sndf));
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return 1;
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}
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if (samp->info.channels > 2) {
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fprintf(stderr, "File has too many channels. Can only handle mono/stereo samples\n");
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return 1;
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}
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size = samp->info.frames * samp->info.channels;
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samp->limit = size;
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samp->data = malloc(size*sizeof(float));
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if (!samp->data) {
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fprintf(stderr,"Failed to allocate sample memory for %s\n",path);
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return 1;
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}
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sf_read_float(sndf,samp->data,size);
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sf_close(sndf);
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return 0;
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}
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static LV2_Handle
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instantiate(const LV2_Descriptor* descriptor,
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double rate,
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const char* bundle_path,
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const LV2_Feature* const* features) {
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int i;
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DrMr* drmr = malloc(sizeof(DrMr));
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drmr->map = NULL;
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drmr->num_samples = 0;
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// Map midi uri
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while(*features) {
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if (!strcmp((*features)->URI, LV2_URI_MAP_URI)) {
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drmr->map = (LV2_URI_Map_Feature *)((*features)->data);
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drmr->uris.midi_event = drmr->map->uri_to_id
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(drmr->map->callback_data,
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"http://lv2plug.in/ns/ext/event",
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"http://lv2plug.in/ns/ext/midi#MidiEvent");
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}
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features++;
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}
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if (!drmr->map) {
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fprintf(stderr, "LV2 host does not support urid:map.\n");
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free(drmr);
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return 0;
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}
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load_hydrogen_kit(drmr,"/usr/share/hydrogen/data/drumkits/GMkit/");
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//load_hydrogen_kit(drmr,"/usr/share/hydrogen/data/drumkits/3355606kit/");
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return (LV2_Handle)drmr;
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}
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static void
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connect_port(LV2_Handle instance,
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uint32_t port,
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void* data) {
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DrMr* drmr = (DrMr*)instance;
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switch ((DrMrPortIndex)port) {
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case DRMR_MIDI:
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drmr->midi_port = (LV2_Event_Buffer*)data;
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break;
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case DRMR_LEFT:
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drmr->left = (float*)data;
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break;
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case DRMR_RIGHT:
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drmr->right = (float*)data;
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break;
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default:
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break;
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}
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}
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static void activate(LV2_Handle instance) { }
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static void run(LV2_Handle instance, uint32_t n_samples) {
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int i;
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char first_active, one_active;
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DrMr* drmr = (DrMr*)instance;
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LV2_Event_Iterator eit;
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if (lv2_event_begin(&eit,drmr->midi_port)) { // if we have any events
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LV2_Event *cur_ev;
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uint8_t* data;
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while (lv2_event_is_valid(&eit)) {
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cur_ev = lv2_event_get(&eit,&data);
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if (cur_ev->type == drmr->uris.midi_event) {
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int channel = *data & 15;
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switch ((*data) >> 4) {
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case 8: // ignore note-offs for now, should probably be a setting
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//if (drmr->cur_samp) drmr->cur_samp->active = 0;
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break;
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case 9: {
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uint8_t nn = data[1];
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nn-=60; // middle c is our root note (setting?)
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if (nn >= 0 && nn < drmr->num_samples) {
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drmr->samples[nn].active = 1;
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drmr->samples[nn].offset = 0;
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}
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break;
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}
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default:
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printf("Unhandeled status: %i\n",(*data)>>4);
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}
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}
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lv2_event_increment(&eit);
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}
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}
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first_active = 1;
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for (i = 0;i < drmr->num_samples;i++) {
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int pos,lim;
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drmr_sample* cs = drmr->samples+i;
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if (cs->active) {
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one_active = 1;
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if (cs->info.channels == 1) { // play mono sample
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lim = (n_samples < (cs->limit - cs->offset)?n_samples:(cs->limit-cs->offset));
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if (first_active) {
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for(pos = 0;pos < lim;pos++) {
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drmr->left[pos] = cs->data[cs->offset];
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drmr->right[pos] = cs->data[cs->offset];
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cs->offset++;
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}
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first_active = 0;
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} else {
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for(pos = 0;pos < lim;pos++) {
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drmr->left[pos] += cs->data[cs->offset];
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drmr->right[pos] += cs->data[cs->offset];
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cs->offset++;
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}
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}
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} else { // play stereo sample
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lim = (cs->limit-cs->offset)/cs->info.channels;
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if (lim > n_samples) lim = n_samples;
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if (first_active) {
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for (pos=0;pos<lim;pos++) {
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drmr->left[pos] = cs->data[cs->offset++];
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drmr->right[pos] = cs->data[cs->offset++];
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}
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first_active = 0;
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} else {
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for (pos=0;pos<lim;pos++) {
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drmr->left[pos] += cs->data[cs->offset++];
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drmr->right[pos] += cs->data[cs->offset++];
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}
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}
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}
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if (cs->offset >= cs->limit) cs->active = 0;
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}
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}
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if (first_active) { // didn't find any samples
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int pos;
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for(pos = 0;pos<n_samples;pos++) {
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drmr->left[pos] = 0.0f;
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drmr->right[pos] = 0.0f;
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}
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}
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}
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static void deactivate(LV2_Handle instance) {}
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static void cleanup(LV2_Handle instance) {
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free(instance);
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}
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const void* extension_data(const char* uri) {
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return NULL;
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}
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static const LV2_Descriptor descriptor = {
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DRMR_URI,
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instantiate,
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connect_port,
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activate,
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run,
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deactivate,
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cleanup,
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extension_data
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};
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LV2_SYMBOL_EXPORT
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const LV2_Descriptor*
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lv2_descriptor(uint32_t index)
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{
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switch (index) {
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case 0:
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return &descriptor;
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default:
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return NULL;
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}
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}
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