> On Mar 21, 2023, at 23:01, Thomas Siedel <thomas...@spin-digital.com> wrote:
>
> Add demuxer to probe raw vvc and parse vvcc byte stream format.
>
> Co-authored-by: Nuo Mi <nuomi2...@gmail.com>
> ---
>
> +
> +static int h266_probe(const AVProbeData *p)
> +{
> + uint32_t code = -1;
> + int sps = 0, pps = 0, irap = 0;
> + int i;
> +
> + for (i = 0; i < p->buf_size - 1; i++) {
> + code = (code << 8) + p->buf[i];
> + if ((code & 0xffffff00) == 0x100) {
> + uint8_t nal2 = p->buf[i + 1];
> + int type = (nal2 & 0xF8) >> 3;
> +
> + if (code & 0x80) // forbidden_zero_bit
> + return 0;
> +
> + if ((nal2 & 0x7) == 0) // nuh_temporal_id_plus1
> + return 0;
> +
> + switch (type) {
> + case VVC_SPS_NUT: sps++; break;
> + case VVC_PPS_NUT: pps++; break;
> + case VVC_IDR_N_LP:
> + case VVC_IDR_W_RADL:
> + case VVC_CRA_NUT:
> + case VVC_GDR_NUT: irap++; break;
> + }
> + }
> + }
> +
> + if (sps && pps && irap)
> + return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
The probe isn’t reliable enough. It mistreated an TS as vvc,
https://trac.ffmpeg.org/ticket/10731#comment:1
Any idea to reduce false positive?
> + return 0;
> +}
> +
> +FF_DEF_RAWVIDEO_DEMUXER(h266, "raw H.266/VVC video", h266_probe,
> "h266,266,vvc", AV_CODEC_ID_VVC)
> --
> 2.25.1
>
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