added files from limelight from android

limelight-pc/jni/nv_opus_dec/libopus/nv_opus_dec.c

@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include <opus.h>
+#include "nv_opus_dec.h"
+
+OpusDecoder* decoder;
+
+// This function must be called before
+// any other decoding functions
+int nv_opus_init(void) {
+	int err;
+	decoder = opus_decoder_create(
+		nv_opus_get_sample_rate(),
+		nv_opus_get_channel_count(),
+		&err);
+	return err;
+}
+
+// This function must be called after
+// decoding is finished
+void nv_opus_destroy(void) {
+	if (decoder != NULL) {
+		opus_decoder_destroy(decoder);
+	}
+}
+
+// The Opus stream is stereo
+int nv_opus_get_channel_count(void) {
+	return 2;
+}
+
+// This number assumes 2 channels at 48 KHz
+int nv_opus_get_max_out_shorts(void) {
+	return 512*nv_opus_get_channel_count();
+}
+
+// The Opus stream is 48 KHz
+int nv_opus_get_sample_rate(void) {
+	return 48000;
+}
+
+// outpcmdata must be 5760*2 shorts in length
+// packets must be decoded in order
+// a packet loss must call this function with NULL indata and 0 inlen
+// returns the number of decoded samples
+int nv_opus_decode(unsigned char* indata, int inlen, short* outpcmdata) {
+	int err;
+
+	// Decoding to 16-bit PCM with FEC off
+	// Maximum length assuming 48KHz sample rate
+	err = opus_decode(decoder, indata, inlen,
+		outpcmdata, 512, 0);
+
+	return err;
+}