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+/*
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+ * Squeezelite - lightweight headless squeezebox emulator
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+ *
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+ * (c) Adrian Smith 2012-2015, triode1@btinternet.com
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+ * Ralph Irving 2015-2017, ralph_irving@hotmail.com
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ */
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+
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+// upsampling using libsoxr - only included if RESAMPLE set
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+
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+#include "squeezelite.h"
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+
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+#if RESAMPLE16
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+
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+#include <resample16.h>
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+
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+extern log_level loglevel;
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+
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+struct resample16 {
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+ struct resample16_s *resampler;
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+ bool max_rate;
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+ bool exception;
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+ bool interp;
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+ resample16_filter_e filter;
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+};
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+
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+static struct resample16 r;
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+
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+void resample_samples(struct processstate *process) {
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+ ssize_t odone;
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+
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+ odone = resample16(r.resampler, (HWORD*) process->inbuf, process->in_frames, (HWORD*) process->outbuf);
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+
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+ if (odone < 0) {
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+ LOG_INFO("resample16 error");
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+ return;
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+ }
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+
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+ process->out_frames = odone;
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+ process->total_in += process->in_frames;
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+ process->total_out += odone;
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+}
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+
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+bool resample_drain(struct processstate *process) {
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+ process->out_frames = 0;
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+
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+ LOG_INFO("resample track complete");
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+
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+ resample16_delete(r.resampler);
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+ r.resampler = NULL;
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+
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+ return true;
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+}
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+
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+bool resample_newstream(struct processstate *process, unsigned raw_sample_rate, unsigned supported_rates[]) {
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+ unsigned outrate = 0;
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+ int i;
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+
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+ if (r.exception) {
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+ // find direct match - avoid resampling
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+ for (i = 0; supported_rates[i]; i++) {
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+ if (raw_sample_rate == supported_rates[i]) {
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+ outrate = raw_sample_rate;
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+ break;
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+ }
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+ }
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+ // else find next highest sync sample rate
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+ while (!outrate && i >= 0) {
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+ if (supported_rates[i] > raw_sample_rate && supported_rates[i] % raw_sample_rate == 0) {
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+ outrate = supported_rates[i];
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+ break;
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+ }
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+ i--;
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+ }
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+ }
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+
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+ if (!outrate) {
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+ if (r.max_rate) {
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+ // resample to max rate for device
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+ outrate = supported_rates[0];
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+ } else {
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+ // resample to max sync sample rate
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+ for (i = 0; supported_rates[i]; i++) {
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+ if (supported_rates[i] % raw_sample_rate == 0 || raw_sample_rate % supported_rates[i] == 0) {
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+ outrate = supported_rates[i];
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+ break;
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+ }
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+ }
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+ }
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+ if (!outrate) {
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+ outrate = supported_rates[0];
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+ }
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+ }
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+
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+ process->in_sample_rate = raw_sample_rate;
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+ process->out_sample_rate = outrate;
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+
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+ if (r.resampler) {
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+ resample16_delete(r.resampler);
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+ r.resampler = NULL;
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+ }
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+
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+ if (raw_sample_rate != outrate) {
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+
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+ LOG_INFO("resampling from %u -> %u", raw_sample_rate, outrate);
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+ r.resampler = resample16_create((float) outrate / raw_sample_rate, RESAMPLE16_SMALL, false);
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+
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+ return true;
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+
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+ } else {
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+
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+ LOG_INFO("disable resampling - rates match");
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+ return false;
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+ }
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+}
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+
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+void resample_flush(void) {
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+ if (r.resampler) {
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+ resample16_delete(r.resampler);
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+ r.resampler = NULL;
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+ }
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+}
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+
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+bool resample_init(char *opt) {
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+ char *filter = NULL, *interp = NULL;
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+
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+ r.resampler = NULL;
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+ r.max_rate = false;
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+ r.exception = false;
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+
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+ if (opt) {
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+ filter = next_param(opt, ':');
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+ interp = next_param(NULL, ':');
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+ }
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+
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+ if (filter) {
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+ if (*filter == 'm') r.filter = RESAMPLE16_SMALL;
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+ else r.filter = RESAMPLE16_FAST;
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+ }
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+
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+ if (interp && *interp == 'i') {
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+ r.interp = true;
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+ }
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+
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+ LOG_INFO("Resampling with filter %d %s", r.filter, r.interp ? "(interpolated)" : "");
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+
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+ return true;
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+}
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+
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+#endif // #if RESAMPLE16
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philippe44