--- /dev/null
+/*
+ * Copyright (C) 2015 "IoT.bzh"
+ * Author "Manuel Bachmann"
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "local-def.h"
+
+/* -------------- RADIO DEFINITIONS ------------------ */
+
+#include <math.h>
+#include <pthread.h>
+#include <rtl-sdr.h>
+
+#define pthread_signal(n, m) pthread_mutex_lock(m); pthread_cond_signal(n); pthread_mutex_unlock(m)
+#define pthread_wait(n, m) pthread_mutex_lock(m); pthread_cond_wait(n, m); pthread_mutex_unlock(m)
+#define BUF_LEN 16*16384
+
+typedef enum { FM, AM } Mode;
+typedef struct dongle_ctx dongle_ctx;
+typedef struct demod_ctx demod_ctx;
+typedef struct output_ctx output_ctx;
+
+struct dongle_ctx {
+ pthread_t thr;
+ unsigned char thr_finished;
+ uint16_t buf[BUF_LEN];
+ uint32_t buf_len;
+};
+
+struct demod_ctx {
+ pthread_t thr;
+ unsigned char thr_finished;
+ pthread_rwlock_t lck;
+ pthread_cond_t ok;
+ pthread_mutex_t ok_m;
+ int pre_r, pre_j, now_r, now_j, index;
+ int pre_index, now_index;
+ int16_t buf[BUF_LEN];
+ int buf_len;
+ int16_t res[BUF_LEN];
+ int res_len;
+};
+
+struct output_ctx {
+ pthread_t thr;
+ unsigned char thr_finished;
+ pthread_rwlock_t lck;
+ pthread_cond_t ok;
+ pthread_mutex_t ok_m;
+ int16_t buf[BUF_LEN];
+ int buf_len;
+};
+
+struct dev_ctx {
+ rtlsdr_dev_t* dev;
+ Mode mode;
+ float freq;
+ unsigned char mute;
+ unsigned char should_run;
+ /* thread contexts */
+ dongle_ctx *dongle;
+ demod_ctx *demod;
+ output_ctx *output;
+};
+
+
+void* _dongle_thread_fn (void *);
+void* _demod_thread_fn (void *);
+void* _output_thread_fn (void *);
+unsigned int _radio_dev_count (void);
+const char* _radio_dev_name (unsigned int);
+unsigned char _radio_dev_init (struct dev_ctx *, unsigned int);
+unsigned char _radio_dev_free (struct dev_ctx *);
+void _radio_apply_params (struct dev_ctx *);
+void _radio_start_threads (struct dev_ctx *);
+void _radio_stop_threads (struct dev_ctx *);
+
+static unsigned int init_dev_count;
+static struct dev_ctx **dev_ctx;
+
+/* ------------- RADIO IMPLEMENTATION ----------------- */
+
+ /* ---- PUBLIC FUNCTIONS --- */
+
+void radio_on () {
+ init_dev_count = _radio_dev_count();
+ int i;
+
+ dev_ctx = (struct dev_ctx**) malloc(init_dev_count * sizeof(struct dev_ctx));
+
+ for (i = 0; i < init_dev_count; i++) {
+ dev_ctx[i] = (struct dev_ctx*) malloc(sizeof(struct dev_ctx));
+ dev_ctx[i]->dev = NULL;
+ dev_ctx[i]->mode = FM;
+ dev_ctx[i]->freq = 100.0;
+ dev_ctx[i]->mute = 0;
+ dev_ctx[i]->should_run = 0;
+ dev_ctx[i]->dongle = NULL;
+ dev_ctx[i]->demod = NULL;
+ dev_ctx[i]->output = NULL;
+ _radio_dev_init(dev_ctx[i], i);
+ }
+}
+
+void radio_off () {
+ int i;
+
+ for (i = 0; i < init_dev_count; i++) {
+ _radio_dev_free(dev_ctx[i]);
+ free(dev_ctx[i]);
+ }
+ free(dev_ctx);
+}
+
+void radio_set_mode (struct dev_ctx *dev_ctx, Mode mode) {
+ dev_ctx->mode = mode;
+ _radio_apply_params(dev_ctx);
+}
+
+void radio_set_freq (struct dev_ctx *dev_ctx, float freq) {
+ dev_ctx->freq = freq;
+ _radio_apply_params(dev_ctx);
+}
+
+void radio_set_mute (struct dev_ctx *dev_ctx, unsigned char mute) {
+ dev_ctx->mute = mute;
+ _radio_apply_params(dev_ctx);
+}
+
+void radio_play (struct dev_ctx *dev_ctx) {
+ _radio_start_threads(dev_ctx);
+}
+
+void radio_stop (struct dev_ctx *dev_ctx) {
+ _radio_stop_threads(dev_ctx);
+}
+
+ /* --- HELPER FUNCTIONS --- */
+
+unsigned int _radio_dev_count () {
+ return rtlsdr_get_device_count();
+}
+
+const char* _radio_dev_name (unsigned int num) {
+ return rtlsdr_get_device_name(num);
+}
+
+unsigned char _radio_dev_init (struct dev_ctx *dev_ctx, unsigned int num) {
+ rtlsdr_dev_t *dev = dev_ctx->dev;
+
+ if (rtlsdr_open(&dev, num) < 0)
+ return 0;
+
+ rtlsdr_set_tuner_gain_mode(dev, 0);
+
+ if (rtlsdr_reset_buffer(dev) < 0)
+ return 0;
+
+ // dev_ctx->dev = dev; REQUIRED IN C TOO ? TEST !
+
+ _radio_apply_params(dev_ctx);
+
+ return 1;
+}
+
+unsigned char _radio_dev_free (struct dev_ctx *dev_ctx) {
+ rtlsdr_dev_t *dev = dev_ctx->dev;
+
+ if (rtlsdr_close(dev) < 0)
+ return 0;
+ dev = NULL;
+
+ return 1;
+}
+
+void _radio_apply_params (struct dev_ctx *dev_ctx) {
+ rtlsdr_dev_t *dev = dev_ctx->dev;
+ Mode mode = dev_ctx->mode;
+ float freq = dev_ctx->freq;
+ int rate;
+
+ freq *= 1000000;
+ rate = ((1000000 / 200000) + 1) * 200000;
+
+ if (mode == FM)
+ freq += 16000;
+ freq += rate / 4;
+
+ rtlsdr_set_center_freq(dev, freq);
+ rtlsdr_set_sample_rate(dev, rate);
+
+ // dev_ctx->dev = dev; REQUIRED IN C TOO ? TEST !
+}
+
+void _radio_start_threads (struct dev_ctx *dev_ctx) {
+ rtlsdr_dev_t *dev = dev_ctx->dev;
+ dev_ctx->dongle = (dongle_ctx*) malloc(sizeof(dongle_ctx));
+ dev_ctx->demod = (demod_ctx*) malloc(sizeof(demod_ctx));
+ dev_ctx->output = (output_ctx*) malloc(sizeof(output_ctx));
+
+ dongle_ctx *dongle = dev_ctx->dongle;
+ demod_ctx *demod = dev_ctx->demod;
+ output_ctx *output = dev_ctx->output;
+
+ pthread_rwlock_init(&demod->lck, NULL);
+ pthread_cond_init(&demod->ok, NULL);
+ pthread_mutex_init(&demod->ok_m, NULL);
+ pthread_rwlock_init(&output->lck, NULL);
+ pthread_cond_init(&output->ok, NULL);
+ pthread_mutex_init(&output->ok_m, NULL);
+
+ dev_ctx->should_run = 1;
+
+ /* dongle thread */
+ dongle->thr_finished = 0;
+ pthread_create(&dongle->thr, NULL, _dongle_thread_fn, (void*)dev_ctx);
+
+ /* demod thread */
+ demod->pre_r = demod->pre_j = 0;
+ demod->now_r = demod->now_j = 0;
+ demod->index = demod->pre_index = demod->now_index = 0;
+ demod->thr_finished = 0;
+ pthread_create(&demod->thr, NULL, _demod_thread_fn, (void*)dev_ctx);
+
+ /* output thread */
+ output->thr_finished = 0;
+ pthread_create(&output->thr, NULL, _output_thread_fn, (void*)dev_ctx);
+}
+
+void _radio_stop_threads (struct dev_ctx *dev_ctx) {
+ rtlsdr_dev_t *dev = dev_ctx->dev;
+ dongle_ctx *dongle = dev_ctx->dongle;
+ demod_ctx *demod = dev_ctx->demod;
+ output_ctx *output = dev_ctx->output;
+
+ if (!dongle || !demod || !output)
+ return;
+
+ /* stop each "while" loop in threads */
+ dev_ctx->should_run = 0;
+
+ rtlsdr_cancel_async(dev);
+ pthread_signal(&demod->ok, &demod->ok_m);
+ pthread_signal(&output->ok, &output->ok_m);
+
+ while (!dongle->thr_finished ||
+ !demod->thr_finished ||
+ !output->thr_finished)
+ usleep(100000);
+
+ pthread_join(dongle->thr, NULL);
+ pthread_join(demod->thr, NULL);
+ pthread_join(output->thr, NULL);
+ pthread_rwlock_destroy(&demod->lck);
+ pthread_cond_destroy(&demod->ok);
+ pthread_mutex_destroy(&demod->ok_m);
+ pthread_rwlock_destroy(&output->lck);
+ pthread_cond_destroy(&output->ok);
+ pthread_mutex_destroy(&output->ok_m);
+
+ free(dongle); dev_ctx->dongle = NULL;
+ free(demod); dev_ctx->demod = NULL;
+ free(output); dev_ctx->output = NULL;
+}
+
+ /* ---- LOCAL THREADED FUNCTIONS ---- */
+
+static void _rtlsdr_callback (unsigned char *buf, uint32_t len, void *ctx) {
+ struct dev_ctx *dev_ctx = (struct dev_ctx *)ctx;
+ dongle_ctx *dongle = dev_ctx->dongle;
+ demod_ctx *demod = dev_ctx->demod;
+ unsigned char tmp;
+ int i;
+
+ if (!dev_ctx->should_run)
+ return;
+
+ /* rotate 90° */
+ for (i = 0; i < (int)len; i += 8) {
+ tmp = 255 - buf[i+3];
+ buf[i+3] = buf[i+2];
+ buf[i+2] = tmp;
+
+ buf[i+4] = 255 - buf[i+4];
+ buf[i+5] = 255 - buf[i+5];
+
+ tmp = 255 - buf[i+6];
+ buf[i+6] = buf[i+7];
+ buf[i+7] = tmp;
+ }
+
+ /* write data */
+ for (i = 0; i < (int)len; i++)
+ dongle->buf[i] = (int16_t)buf[i] - 127;
+
+ /* lock demod thread, write to it, unlock */
+ pthread_rwlock_wrlock(&demod->lck);
+ memcpy(demod->buf, dongle->buf, 2 * len);
+ demod->buf_len = len;
+ pthread_rwlock_unlock(&demod->lck);
+ pthread_signal(&demod->ok, &demod->ok_m);
+}
+ /**/
+void* _dongle_thread_fn (void *ctx) {
+ struct dev_ctx *dev_ctx = (struct dev_ctx *)ctx;
+ struct dongle_ctx *dongle = dev_ctx->dongle;
+
+ rtlsdr_read_async(dev_ctx->dev, _rtlsdr_callback, dev_ctx, 0, 0);
+
+ dongle->thr_finished = 1;
+ return 0;
+}
+
+void _lowpass_demod (void *ctx) {
+ demod_ctx *demod = (demod_ctx *)ctx;
+ int i=0, i2=0;
+
+ while (i < demod->buf_len) {
+ demod->now_r += demod->buf[i];
+ demod->now_j += demod->buf[i+1];
+ i += 2;
+ demod->index++;
+ if (demod->index < ((1000000 / 200000) + 1))
+ continue;
+ demod->buf[i2] = demod->now_r;
+ demod->buf[i2+1] = demod->now_j;
+ demod->index = 0;
+ demod->now_r = demod->now_j = 0;
+ i2 += 2;
+ }
+ demod->buf_len = i2;
+}
+ /**/
+void _lowpassreal_demod (void *ctx) {
+ demod_ctx *demod = (demod_ctx *)ctx;
+ int i=0, i2=0;
+ int fast = 200000;
+ int slow = 48000;
+
+ while (i < demod->res_len) {
+ demod->now_index += demod->res[i];
+ i++;
+ demod->pre_index += slow;
+ if (demod->pre_index < fast)
+ continue;
+ demod->res[i2] = (int16_t)(demod->now_index / (fast/slow));
+ demod->pre_index -= fast;
+ demod->now_index = 0;
+ i2 += 1;
+ }
+ demod->res_len = i2;
+}
+ /**/
+void _multiply (int ar, int aj, int br, int bj, int *cr, int *cj) {
+ *cr = ar*br - aj*bj;
+ *cj = aj*br + ar*bj;
+}
+ /**/
+int _polar_discriminant (int ar, int aj, int br, int bj) {
+ int cr, cj;
+ double angle;
+ _multiply(ar, aj, br, -bj, &cr, &cj);
+ angle = atan2((double)cj, (double)cr);
+ return (int)(angle / 3.14159 * (1<<14));
+}
+ /**/
+void _fm_demod (void *ctx) {
+ demod_ctx *demod = (demod_ctx *)ctx;
+ int16_t *buf = demod->buf;
+ int buf_len = demod->buf_len;
+ int pcm, i;
+
+ pcm = _polar_discriminant(buf[0], buf[1], demod->pre_r, demod->pre_j);
+ demod->res[0] = (int16_t)pcm;
+
+ for (i = 2; i < (buf_len-1); i += 2) {
+ pcm = _polar_discriminant(buf[i], buf[i+1], buf[i-2], buf[i-1]);
+ demod->res[i/2] = (int16_t)pcm;
+ }
+ demod->pre_r = buf[buf_len - 2];
+ demod->pre_j = buf[buf_len - 1];
+ demod->res_len = buf_len/2;
+}
+ /**/
+void _am_demod (void *ctx) {
+ demod_ctx *demod = (demod_ctx *)ctx;
+ int16_t *buf = demod->buf;
+ int buf_len = demod->buf_len;
+ int pcm, i;
+
+ for (i = 0; i < buf_len; i += 2) {
+ pcm = buf[i] * buf[i];
+ pcm += buf[i+1] * buf[i+1];
+ demod->res[i/2] = (int16_t)sqrt(pcm);
+ }
+ demod->res_len = buf_len/2;
+}
+ /**/
+void* _demod_thread_fn (void *ctx) {
+ struct dev_ctx *dev_ctx = (struct dev_ctx *)ctx;
+ demod_ctx *demod = dev_ctx->demod;
+ output_ctx *output = dev_ctx->output;
+
+ while(dev_ctx->should_run) {
+ pthread_wait(&demod->ok, &demod->ok_m);
+ pthread_rwlock_wrlock(&demod->lck);
+ _lowpass_demod(demod);
+ if (dev_ctx->mode == FM)
+ _fm_demod(demod);
+ else
+ _am_demod(demod);
+ _lowpassreal_demod(demod);
+ pthread_rwlock_unlock(&demod->lck);
+
+ /* lock demod thread, write to it, unlock */
+ pthread_rwlock_wrlock(&output->lck);
+ memcpy(output->buf, demod->res, 2 * demod->res_len);
+ output->buf_len = demod->res_len;
+ pthread_rwlock_unlock(&output->lck);
+ pthread_signal(&output->ok, &output->ok_m);
+ }
+
+ demod->thr_finished = 1;
+ return 0;
+}
+
+void* _output_thread_fn (void *ctx) {
+ struct dev_ctx *dev_ctx = (struct dev_ctx *)ctx;
+ output_ctx *output = dev_ctx->output;
+
+ while (dev_ctx->should_run) {
+ pthread_wait(&output->ok, &output->ok_m);
+ pthread_rwlock_rdlock(&output->lck);
+ //if (!dev_ctx->mute)
+ // mRadio->PlayAlsa((void*)&output->buf, output->buf_len);
+ pthread_rwlock_unlock(&output->lck);
+ }
+
+ output->thr_finished = 1;
+ return 0;
+}
+
+/* -------------- PLUGIN BINDING ------------------- */
+
+STATIC json_object* start (AFB_session *session, AFB_request *request, void* handle) {
+ json_object *response;
+ char query [512];
+
+ // request all query key/value
+ getQueryAll (request, query, sizeof(query));
+
+ // check if we have some post data
+ if (request->post == NULL) request->post="NoData";
+
+ // return response to caller
+ response = jsonNewMessage(AFB_SUCCESS, "Start Radio plugin query={%s} PostData: \'%s\' ", query, request->post);
+
+ //if (verbose) fprintf(stderr, "%d: \n", pingcount);
+ return (response);
+}
+
+STATIC json_object* stop (AFB_session *session, AFB_request *request, void* handle) {
+ json_object *response;
+ char query [512];
+
+ getQueryAll (request, query, sizeof(query));
+
+ if (request->post == NULL) request->post="NoData";
+
+ response = jsonNewMessage(AFB_SUCCESS, "Stop Radio plugin query={%s} PostData: \'%s\' ", query, request->post);
+
+ return (response);
+}
+
+
+STATIC struct {
+ void * somedata;
+} handle;
+
+
+STATIC AFB_restapi pluginApis[]= {
+ {"start" , (AFB_apiCB)start , "Ping Application Framework", NULL},
+ {"stop" , (AFB_apiCB)stop , "Ping Application Framework", NULL},
+ {0,0,0}
+};
+
+PUBLIC AFB_plugin *radioRegister (AFB_session *session) {
+ AFB_plugin *plugin = malloc (sizeof (AFB_plugin));
+ plugin->type = AFB_PLUGIN;
+ plugin->info = "Application Framework Binder - Radio plugin";
+ plugin->prefix = "radio";
+ plugin->apis = pluginApis;
+
+ return (plugin);
+};
Code Review / src / app-framework-binder.git / commitdiff