[FFmpeg-devel] [PATCH] avcodec: Allow user applications to provide non padded input buffers

[Michael Niedermayer]

On Thu, Jan 15, 2015 at 01:58:40AM +0100, Michael Niedermayer wrote:
> This can be extended easily to skip the buffer growing for codecs which do
> not need it.
> 
> The added field or a equivalent change is needed as the AVBuffer
> size might not match the actually allocated and saftely accessable
> memory
> 
> Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> ---
>  libavcodec/avcodec.h |   16 ++++++++++++++++
>  libavcodec/utils.c   |   19 ++++++++++++++++++-
>  2 files changed, 34 insertions(+), 1 deletion(-)
> 
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 99467bb..ed0bee0 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -3128,6 +3128,18 @@ typedef struct AVCodecContext {
>       * - decoding: set by user through AVOPtions (NO direct access)
>       */
>      char *codec_whitelist;
> +
> +    /**
> +     * Allocated input size
> +     * If this is 0 then it is assumed the user allocated size + FF_INPUT_BUFFER_PADDING_SIZE.
> +     * Note, many decoders need the padding and will copy/reallocate the buffer
> +     * if insufficient padding is provided.
> +     * Currently only supported for video.

> +     * This also requires the

removed this stray line locally

[...]

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