Quoting Luca Barbato (2014-11-04 09:50:00)
> ---
> libavformat/avformat.h | 30 +++++++++++++++++++++++
> libavformat/mux.c | 64
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 94 insertions(+)
>
> diff --git a/libavformat/avformat.h b/libavformat/avformat.h
> index f28186f..4449314 100644
> --- a/libavformat/avformat.h
> +++ b/libavformat/avformat.h
> @@ -1613,6 +1613,36 @@ void avformat_close_input(AVFormatContext **s);
> * @addtogroup lavf_encoding
> * @{
> */
> +
> +/**
> + * Open prepare an output AVFormatContext so it can be passed to
> + * avformat_write_header(). Internally avformat_alloc_context() and
> + * avio_open2() will be called.
> + *
> + * @param ps Pointer to user-supplied AVFormatContext allocated by
> + * avformat_alloc_context().
> + * May be a pointer to NULL, in which case an AVFormatContext
> + * is allocated by this function and written into ps.
> + * @note The user-supplied AVFormatContext will be freed
> + * on failure. If the supplied context provides the
> + * AVIOContext, it will be freed as well.
> + * @param filename Name of the file to create or open.
> + * @param fmt If non-NULL, this parameter forces a specific input
> + * format, otherwise the format is autodetected.
> + * @param options An AVDictionary filled with AVIOContext and
> protocol-private
> + * options.
> + * On return this parameter will be destroyed and replaced
> + * with a dict containing options that were not found.
> + * May be NULL.
> + *
> + * @return 0 on success, negative AVERROR on failure.
> + *
> + * @see av_opt_find, av_dict_set, avio_open2, avformat_write_header()
> + */
> +
> +int avformat_open_output(AVFormatContext **ps, const char *filename,
> + AVOutputFormat *fmt, AVDictionary **options);
What's the point in allowing preallocated AVFormatContext? It adds weird
corner cases to the API without much gain (that I can see).
--
Anton Khirnov
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