25a249fbd5
This patch introduces a new build tag `nolibopusfile` that conditionally compiles out the code that imports `libopusfile`. This enables a static binary build on Alpine Linux, which doesn’t have a static `libopusfile`. Tests still work: ```sh go test -tags nolibopusfile ./... go test ./... ``` We could also have moved all libopusfile related code (i.e. Stream) into a separate sub-package, but that would break backwards compatibility. This feature is too unpopular to justify introducing a new major version. See also: https://github.com/hraban/opus/pull/24
30 lines
1,008 B
C
30 lines
1,008 B
C
// +build !nolibopusfile
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// Copyright © Go Opus Authors (see AUTHORS file)
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//
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// License for use of this code is detailed in the LICENSE file
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// Allocate callback struct in C to ensure it's not managed by the Go GC. This
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// plays nice with the CGo rules and avoids any confusion.
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#include <opusfile.h>
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#include <stdint.h>
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// Defined in Go. Uses the same signature as Go, no need for proxy function.
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int go_readcallback(void *p, unsigned char *buf, int nbytes);
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static struct OpusFileCallbacks callbacks = {
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.read = go_readcallback,
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};
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// Proxy function for op_open_callbacks, because it takes a void * context but
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// we want to pass it non-pointer data, namely an arbitrary uintptr_t
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// value. This is legal C, but go test -race (-d=checkptr) complains anyway. So
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// we have this wrapper function to shush it.
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// https://groups.google.com/g/golang-nuts/c/995uZyRPKlU
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OggOpusFile *
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my_open_callbacks(uintptr_t p, int *error)
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{
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return op_open_callbacks((void *)p, &callbacks, NULL, 0, error);
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}
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