[FFmpeg-devel] [PATCH 3/3] lavc: implement an ATRAC9 decoder

[Rostislav Pehlivanov]

On 30 June 2018 at 08:44, Rostislav Pehlivanov <atomnuker at gmail.com> wrote:

>
> +static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
> +                                   int start, int count)
> +{
> +    float maxval = 0.0f;
> +    for (int i = 0; i < count; i += 2) {
> +        double tmp[2];
> +        av_bmg_get(&s->lfg, tmp);
> +        c->coeffs[start + i + 0] = tmp[0];
> +        c->coeffs[start + i + 1] = tmp[1];
> +        maxval = FFMAX(tmp[0], FFMAX(tmp[1], maxval));
>

Erm this should be maxval = FFMAX(FFABS(tmp[0]), FFMAX(FFABS(tmp[1]),
maxval));
Attached new patch to fix that.



> +    }
> +    /* Normalize */
> +    for (int i = 0; i < count; i++)
> +        c->coeffs[start + i] /= maxval;
> +}
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