fix build for linux/windows

types_linux.go

@@ -0,0 +1,34 @@
+// +build linux
+package rtsp
+
+/*
+#cgo LDFLAGS: -lavformat -lavutil -lavcodec -lswresample -lswscale -lm
+#include "ffmpeg.h"
+*/
+import "C"
+import (
+	"unsafe"
+)
+
+func CErr2Str(code C.int) string {
+	buf := make([]byte, 64)
+
+	C.av_strerror(code, (*C.char)(unsafe.Pointer(&buf[0])), C.ulong(len(buf)))
+
+	return string(buf)
+}
+
+func swrAllocSetOpts(layout uint64, sampleRate C.int, sampleFmt int32) *C.SwrContext {
+	swrContext := C.swr_alloc_set_opts(nil, // we're allocating a new context
+		C.long(layout),      // out_ch_layout
+		C.AV_SAMPLE_FMT_S16, // out_sample_fmt
+		sampleRate,          // out_sample_rate
+
+		C.long(layout), // in_ch_layout
+		sampleFmt,      // in_sample_fmt
+		sampleRate,     // in_sample_rate
+
+		0,   // log_offset
+		nil) // log_ctx
+	return swrContext
+}