Re: [FFmpeg-devel] [PATCH] avformat/apvdec: also look for an au_info PBU during probing

[James Almer <jamrial@gmail.com>]

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On 5/1/2025 2:49 PM, James Almer wrote:
> If present, an Access unit information PBU must be the first in an AU.
> 
> Signed-off-by: James Almer <jamrial@gmail.com>
> ---
>   libavformat/apvdec.c | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/libavformat/apvdec.c b/libavformat/apvdec.c
> index 5d0b11b654..e53c9ed085 100644
> --- a/libavformat/apvdec.c
> +++ b/libavformat/apvdec.c
> @@ -51,7 +51,24 @@ static int apv_extract_header_info(GetByteContext *gbc)
>       if (zero != 0)
>           return AVERROR_INVALIDDATA;
>   
> -    if (info->pbu_type != APV_PBU_PRIMARY_FRAME)
> +    if (info->pbu_type == APV_PBU_ACCESS_UNIT_INFORMATION) {
> +        unsigned int num_frames = bytestream2_get_be16(gbc);
> +        int pbu_type;
> +
> +        if (num_frames < 1)
> +            return AVERROR_INVALIDDATA;
> +
> +        info->pbu_type = bytestream2_get_byte(gbc);
> +        if (info->pbu_type != APV_PBU_PRIMARY_FRAME &&
> +            info->pbu_type != APV_PBU_NON_PRIMARY_FRAME &&
> +            (info->pbu_type < APV_PBU_PREVIEW_FRAME || info->pbu_type > APV_PBU_ALPHA_FRAME))
> +            return AVERROR_INVALIDDATA;
> +
> +        bytestream2_skip(gbc, 2); // group_id
> +        zero = bytestream2_get_byte(gbc);
> +        if (zero != 0)
> +            return AVERROR_INVALIDDATA;
> +    } else if (info->pbu_type != APV_PBU_PRIMARY_FRAME)
>           return AVERROR_INVALIDDATA;
>   
>       info->profile_idc = bytestream2_get_byte(gbc);

Will apply.


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