Re: [FFmpeg-devel] [PATCH 1/2] avformat/mxfenc: allow more bits for variable part in uuid generation

["Tomas Härdin" <tjoppen@acc.umu.se>]

mån 2022-03-14 klockan 19:49 +0100 skrev Marton Balint:
> Also make sure we do not change the product UID.
> 
> Signed-off-by: Marton Balint <cus@passwd.hu>
> ---
>  libavformat/mxfenc.c                    | 9 +++++----
>  tests/ref/fate/copy-trac4914            | 2 +-
>  tests/ref/fate/mxf-d10-user-comments    | 6 +++---
>  tests/ref/fate/mxf-opatom-user-comments | 2 +-
>  tests/ref/fate/mxf-reel_name            | 2 +-
>  tests/ref/fate/mxf-user-comments        | 2 +-
>  tests/ref/fate/time_base                | 2 +-
>  tests/ref/lavf/mxf                      | 6 +++---
>  tests/ref/lavf/mxf_d10                  | 2 +-
>  tests/ref/lavf/mxf_dv25                 | 2 +-
>  tests/ref/lavf/mxf_dvcpro50             | 2 +-
>  tests/ref/lavf/mxf_opatom               | 2 +-
>  tests/ref/lavf/mxf_opatom_audio         | 2 +-
>  13 files changed, 21 insertions(+), 20 deletions(-)
> 
> diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
> index 1e87dc6111..ba8e7babfb 100644
> --- a/libavformat/mxfenc.c
> +++ b/libavformat/mxfenc.c
> @@ -227,7 +227,8 @@ static const UID mxf_d10_container_uls[] = {
>      {
> 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01
> ,0x06,0x01 }, // D-10 525/50 NTSC 30mb/s
>  };
>  
> -static const uint8_t uuid_base[]            = {
> 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd };
> +static const uint8_t product_uid[]          = {
> 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff,0x29,0xbd,0x00,0x0c
> ,0x00,0x02};

Maybe use Identification instead of 0x0C.

> +static const uint8_t uuid_base[]            = {
> 0xAD,0xAB,0x44,0x24,0x2f,0x25,0x4d,0xc7,0x92,0xff };
>  static const uint8_t umid_ul[]              = {
> 0x06,0x0A,0x2B,0x34,0x01,0x01,0x01,0x05,0x01,0x01,0x0D,0x00,0x13 };
>  
>  /**
> @@ -424,9 +425,9 @@ typedef struct MXFContext {
>  
>  static void mxf_write_uuid(AVIOContext *pb, enum MXFMetadataSetType
> type, int value)
>  {
> -    avio_write(pb, uuid_base, 12);
> +    avio_write(pb, uuid_base, 10);
>      avio_wb16(pb, type);
> -    avio_wb16(pb, value);
> +    avio_wb32(pb, value);
>  }
>  
>  static void mxf_write_umid(AVFormatContext *s, int type)
> @@ -797,7 +798,7 @@ static void
> mxf_write_identification(AVFormatContext *s)
>  
>      // write product uid
>      mxf_write_local_tag(s, 16, 0x3C05);
> -    mxf_write_uuid(pb, Identification, 2);
> +    avio_write(pb, product_uid, 16);

For those wondering, the purpose of this not using mxf_write_uuid() is
likely to keep ProductUID the same after this patch. This is of course
good if a bit ugly since the calls with 0 and 1 are still there. Oh
well.

/Tomas

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