Re: [FFmpeg-devel] [PATCH v2] avformat/riffdec: warn on invalid sample rate

[Viraaj Raulgaonkar <viraajraulgkar@gmail.com>]

Hi Marton,

On Mon, Jan 27, 2025 at 1:25 AM Marton Balint <cus@passwd.hu> wrote:
>
>
>
> On Sun, 26 Jan 2025, Viraaj Raulgaonkar wrote:
>
> > Instead of returning an error for invalid sample rates, warn the user
> > and set sample_rate to INT_MAX. This allows the sample rate to be
> > decoded in certain cases.
> >
> > Fixes Trac Ticket #11361.
> > ---
> > libavformat/riffdec.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/libavformat/riffdec.c b/libavformat/riffdec.c
> > index b7a85a6ab2..c8b50d5f35 100644
> > --- a/libavformat/riffdec.c
> > +++ b/libavformat/riffdec.c
> > @@ -180,9 +180,9 @@ int ff_get_wav_header(void *logctx, AVIOContext *pb,
> >     par->bit_rate = bitrate;
> >
> >     if (par->sample_rate <= 0) {
> > -        av_log(logctx, AV_LOG_ERROR,
> > +        av_log(logctx, AV_LOG_WARNING,
> >                "Invalid sample rate: %d\n", par->sample_rate);
> > -        return AVERROR_INVALIDDATA;
> > +        par->sample_rate = INT_MAX;
>
> Making up a false sample rate is not acceptable. You should set it to 0
> instead, at least that can be interpreted as unknown.

That makes a lot of sense.

>
> Also you should check AVFormatContext strict_std_compliance and reject or
> allow based on that:
>
> Something like:
>
> int strict = logctx->strict_std_compliance >= FF_COMPLIANCE_STRICT;
> av_log(s, strict ? AV_LOG_ERROR : AV_LOG_WARNING, "Invalid sample rate: %d\n", par->sample_rate)
> if (strict)
>      return AVERROR_INVALIDDATA;
> par->sample_rate = 0;
>
> logctx should be an AVFormatContext, so you should change the type from
> void* to that.

Thanks for the feedback! I'll update the patch accordingly and send a
revised patch soon.

Regards,
Viraaj

>
> Thanks,
> Marton
>
>
> >     }
> >     if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
> >         /* Channels and sample_rate values are those prior to applying SBR
> > --
> > 2.39.5
> >
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