[vlc-devel] [PATCH 2 of 4] avcodec: add HDYC to known ffmpeg chroma table

[David Flynn]

On 2008-10-14, Edouard Gomez <ed.gomez at free.fr> wrote:
> diff --git a/modules/codec/avcodec/chroma.h b/modules/codec/avcodec/chroma.h
> --- a/modules/codec/avcodec/chroma.h
> +++ b/modules/codec/avcodec/chroma.h
> @@ -76,6 +76,13 @@
>      {VLC_FOURCC('Y','U','Y','2'), PIX_FMT_YUYV422, 0, 0, 0 },
>      {VLC_FOURCC('Y','U','Y','V'), PIX_FMT_YUYV422, 0, 0, 0 },
>      {VLC_FOURCC('U','Y','V','Y'), PIX_FMT_UYVY422, 0, 0, 0 },
> +    /* The next entry for HDYC is more of a temporary hack.
> +     * UYVY conforms to the BT601 standard making its Y samples use a reduced
> +     * [16-235] range whereas HDYC conforms to the BT709 standard which makes
> +     * its Y samples use the full [0-255] range.
> +     * When HDYC is handled by both vlc and avcodec, then we should switch
> +     * to the proper colorspace pixel format. */
> +    {VLC_FOURCC('H','D','Y','C'), PIX_FMT_UYVY422, 0, 0, 0 },
>      {VLC_FOURCC('Y','4','1','1'), PIX_FMT_UYYVYY411, 0, 0, 0 },

Just for completeness, the comment should read:

/* The next entry for HDYC is more of a temporary hack.
 * UYVY and HDYC use the same sample positions, but
 * UYVY uses Rec601 colourimetry rather than Rec709 for HDYC */

..david