diff --git a/audiofifo.go b/gmf/audiofifo.go
similarity index 100%
rename from audiofifo.go
rename to gmf/audiofifo.go
diff --git a/avio_go112.go b/gmf/avio_go112.go
similarity index 100%
rename from avio_go112.go
rename to gmf/avio_go112.go
diff --git a/avio_go16.go b/gmf/avio_go16.go
similarity index 100%
rename from avio_go16.go
rename to gmf/avio_go16.go
diff --git a/cgoMemory.go b/gmf/cgoMemory.go
similarity index 100%
rename from cgoMemory.go
rename to gmf/cgoMemory.go
diff --git a/cgoMemory_test.go b/gmf/cgoMemory_test.go
similarity index 100%
rename from cgoMemory_test.go
rename to gmf/cgoMemory_test.go
diff --git a/codec.go b/gmf/codec.go
similarity index 100%
rename from codec.go
rename to gmf/codec.go
diff --git a/codecCtx_go112.go b/gmf/codecCtx_go112.go
similarity index 100%
rename from codecCtx_go112.go
rename to gmf/codecCtx_go112.go
diff --git a/codecCtx_go16.go b/gmf/codecCtx_go16.go
similarity index 100%
rename from codecCtx_go16.go
rename to gmf/codecCtx_go16.go
diff --git a/codecCtx_test.go b/gmf/codecCtx_test.go
similarity index 100%
rename from codecCtx_test.go
rename to gmf/codecCtx_test.go
diff --git a/codecDesc.go b/gmf/codecDesc.go
similarity index 100%
rename from codecDesc.go
rename to gmf/codecDesc.go
diff --git a/codecDesc_test.go b/gmf/codecDesc_test.go
similarity index 100%
rename from codecDesc_test.go
rename to gmf/codecDesc_test.go
diff --git a/codecParam.go b/gmf/codecParam.go
similarity index 100%
rename from codecParam.go
rename to gmf/codecParam.go
diff --git a/codec_test.go b/gmf/codec_test.go
similarity index 100%
rename from codec_test.go
rename to gmf/codec_test.go
diff --git a/dict.go b/gmf/dict.go
similarity index 100%
rename from dict.go
rename to gmf/dict.go
diff --git a/example_encoding_test.go b/gmf/example_encoding_test.go
similarity index 100%
rename from example_encoding_test.go
rename to gmf/example_encoding_test.go
diff --git a/filter_go112.go b/gmf/filter_go112.go
similarity index 100%
rename from filter_go112.go
rename to gmf/filter_go112.go
diff --git a/filter_go16.go b/gmf/filter_go16.go
similarity index 100%
rename from filter_go16.go
rename to gmf/filter_go16.go
diff --git a/format_go112.go b/gmf/format_go112.go
similarity index 100%
rename from format_go112.go
rename to gmf/format_go112.go
diff --git a/format_go16.go b/gmf/format_go16.go
similarity index 100%
rename from format_go16.go
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diff --git a/format_test.go b/gmf/format_test.go
similarity index 100%
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rename to gmf/format_test.go
diff --git a/frame_go112.go b/gmf/frame_go112.go
similarity index 100%
rename from frame_go112.go
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diff --git a/frame_go16.go b/gmf/frame_go16.go
similarity index 100%
rename from frame_go16.go
rename to gmf/frame_go16.go
diff --git a/imgutils.go b/gmf/imgutils.go
similarity index 100%
rename from imgutils.go
rename to gmf/imgutils.go
diff --git a/imgutils_test.go b/gmf/imgutils_test.go
similarity index 100%
rename from imgutils_test.go
rename to gmf/imgutils_test.go
diff --git a/io.go b/gmf/io.go
similarity index 100%
rename from io.go
rename to gmf/io.go
diff --git a/options.go b/gmf/options.go
similarity index 100%
rename from options.go
rename to gmf/options.go
diff --git a/options_test.go b/gmf/options_test.go
similarity index 100%
rename from options_test.go
rename to gmf/options_test.go
diff --git a/packet_go112.go b/gmf/packet_go112.go
similarity index 100%
rename from packet_go112.go
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diff --git a/packet_go16.go b/gmf/packet_go16.go
similarity index 100%
rename from packet_go16.go
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diff --git a/packet_test.go b/gmf/packet_test.go
similarity index 100%
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diff --git a/samplefmt_go112.go b/gmf/samplefmt_go112.go
similarity index 100%
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diff --git a/samplefmt_go16.go b/gmf/samplefmt_go16.go
similarity index 100%
rename from samplefmt_go16.go
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diff --git a/stream.go b/gmf/stream.go
similarity index 100%
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rename to gmf/stream.go
diff --git a/stream_test.go b/gmf/stream_test.go
similarity index 100%
rename from stream_test.go
rename to gmf/stream_test.go
diff --git a/swr.go b/gmf/swr.go
similarity index 100%
rename from swr.go
rename to gmf/swr.go
diff --git a/swr_test.go b/gmf/swr_test.go
similarity index 100%
rename from swr_test.go
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diff --git a/sws_go112.go b/gmf/sws_go112.go
similarity index 100%
rename from sws_go112.go
rename to gmf/sws_go112.go
diff --git a/sws_go16.go b/gmf/sws_go16.go
similarity index 100%
rename from sws_go16.go
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diff --git a/sws_test.go b/gmf/sws_test.go
similarity index 100%
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diff --git a/utils.go b/gmf/utils.go
similarity index 100%
rename from utils.go
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diff --git a/utils_test.go b/gmf/utils_test.go
similarity index 100%
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diff --git a/go.mod b/go.mod
index a011dd5..4bb1f01 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 module github.com/3d0c/gmf
 
-go 1.12
+go 1.18
 
 require github.com/stretchr/testify v1.7.1