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POPython SWIG bindings with SomeType ** as function argument
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2013-05-02T16:29:12.093
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2013-05-02T17:21:12.230
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I couldn't find any working Python bindings for ffmpeg, so I decided to generate one with SWIG. Generation was quick and easy (no customization, just default SWIG interface), but these a problem using some functions like <code>int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);</code> from <a href="http://svn.perian.org/ffmpeg/libavformat/avformat.h" rel="nofollow">libavformat/avformat.h</a>. Using C this can be run simply by: <pre><code>AVFormatContext *pFormatCtx = NULL; int status; status = avformat_open_input(&pFormatCtx, '/path/to/my/file.ext', NULL, NULL); </code></pre> In Python I try following: <pre><code>>>> from ppmpeg import * >>> av_register_all() >>> FormatCtx = AVFormatContext() >>> FormatCtx <ppmpeg.AVFormatContext; proxy of <Swig Object of type 'struct AVFormatContext *' at 0x173eed0> > >>> avformat_open_input(FormatCtx, '/path/to/my/file.ext', None, None) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: in method 'avformat_open_input', argument 1 of type 'AVFormatContext **' </code></pre> Problem is that Python do not have & equivalent. I tried to use <code>cpointer.i</code> and its <code>pointer_class</code> (<code>%pointer_class(AVFormatContext, new_ctx)</code>), but <code>new_ctx()</code> returns pointer and this is not I want definitely. <code>%pointer_class(AVFormatContext *, new_ctx)</code> is illegal and gives syntax error. I would be grateful for any help. Thanks. EDIT: I forgot to mention I tried to use typemaps, but don't know how to write custom typemap for struct and documentation has only examples for basic types like int or float...
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<python><c><ffmpeg><swig>
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Python SWIG bindings with SomeType ** as function argument
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