Hi Ming,
sorry for the late reply ...
Le mardi 20 décembre 2022 à 16:39 +0800, Ming Qian a écrit :
> RealMedia is a proprietary multimedia container format
> created by RealNetworks with the filename extension .rm.
> RealMedia is generally used in conjunction with RealVideo and RealAudio,
> while also being used for streaming content over the Internet.
>
> Signed-off-by: Ming Qian <ming.qian@xxxxxxx>
> ---
> .../userspace-api/media/v4l/pixfmt-compressed.rst | 11 +++++++++++
> drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
> include/uapi/linux/videodev2.h | 1 +
> 3 files changed, 13 insertions(+)
>
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> index 8794b92fde36..31ba2c00091e 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> @@ -237,6 +237,17 @@ Compressed Formats
> Metadata associated with the frame to decode is required to be passed
> through the ``V4L2_CID_STATELESS_FWHT_PARAMS`` control.
> See the :ref:`associated Codec Control ID <codec-stateless-fwht>`.
> + * .. _V4L2-PIX-FMT-RV:
> +
> + - ``V4L2_PIX_FMT_RV``
> + - 'RealMedia'
> + - RealMedia is a proprietary multimedia container format
> + created by RealNetworks with the filename extension .rm.
> + RealMedia is generally used in conjunction with RealVideo and RealAudio,
> + while also being used for streaming content over the Internet.
> + Typically these streams are in CBR (constant bitrate),
> + but a container for VBR (variable bitrate) streams
> + named RMVB (RealMedia variable bitrate) has been developed.
I'm a bit confused with the description here. It describes the RealMedia (RM)
container format, but what you wanted is a RealVideo encoding (RV).
A quick search into FFMpeg (the only Open Source software decoder I could find),
the RealVideo comes in 4 incompatible flavours, RV10/RV20/RV30/RV40 also known
as RealVideo 1 / G2 / 8 / 9+10. I think the format here should be a RealVideo
format, and it should specify the flavours you want to support (probably only
RV40).
regards,
Nicolas
>
> .. raw:: latex
>
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 9b5b04b8aa69..a4d12eea7fc5 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1473,6 +1473,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
> case V4L2_PIX_FMT_FWHT: descr = "FWHT"; break; /* used in vicodec */
> case V4L2_PIX_FMT_FWHT_STATELESS: descr = "FWHT Stateless"; break; /* used in vicodec */
> case V4L2_PIX_FMT_SPK: descr = "Sorenson Spark"; break;
> + case V4L2_PIX_FMT_RV: descr = "RealMedia"; break;
> case V4L2_PIX_FMT_CPIA1: descr = "GSPCA CPiA YUV"; break;
> case V4L2_PIX_FMT_WNVA: descr = "WNVA"; break;
> case V4L2_PIX_FMT_SN9C10X: descr = "GSPCA SN9C10X"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 262ef10cfa02..a7a7969ae4f8 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -740,6 +740,7 @@ struct v4l2_pix_format {
> #define V4L2_PIX_FMT_H264_SLICE v4l2_fourcc('S', '2', '6', '4') /* H264 parsed slices */
> #define V4L2_PIX_FMT_HEVC_SLICE v4l2_fourcc('S', '2', '6', '5') /* HEVC parsed slices */
> #define V4L2_PIX_FMT_SPK v4l2_fourcc('S', 'P', 'K', '0') /* Sorenson Spark */
> +#define V4L2_PIX_FMT_RV v4l2_fourcc('R', 'V', '0', '0') /* RealMedia */
>
> /* Vendor-specific formats */
> #define V4L2_PIX_FMT_CPIA1 v4l2_fourcc('C', 'P', 'I', 'A') /* cpia1 YUV */
