[FFmpeg-devel] [PATCH 3/5] lavc/h264dec: loosen new-extradata check

[James Almer]

On 6/11/2020 1:43 AM, rcombs wrote:
> ---
>  libavcodec/h264dec.c | 13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/libavcodec/h264dec.c b/libavcodec/h264dec.c
> index 6270ea80df..0d7492cfad 100644
> --- a/libavcodec/h264dec.c
> +++ b/libavcodec/h264dec.c
> @@ -988,6 +988,8 @@ static int h264_decode_frame(AVCodecContext *avctx, void *data,
>      AVFrame *pict      = data;
>      int buf_index;
>      int ret;
> +    const uint8_t *new_extra;
> +    int new_extra_size;
>  
>      h->flags = avctx->flags;
>      h->setup_finished = 0;
> @@ -999,13 +1001,10 @@ static int h264_decode_frame(AVCodecContext *avctx, void *data,
>      if (buf_size == 0)
>          return send_next_delayed_frame(h, pict, got_frame, 0);
>  
> -    if (h->is_avc && av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, NULL)) {
> -        int side_size;
> -        uint8_t *side = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
> -        if (is_extra(side, side_size))
> -            ff_h264_decode_extradata(side, side_size,
> -                                     &h->ps, &h->is_avc, &h->nal_length_size,
> -                                     avctx->err_recognition, avctx);
> +    if ((new_extra = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA, &new_extra_size))) {
> +        ff_h264_decode_extradata(new_extra, new_extra_size,
> +                                 &h->ps, &h->is_avc, &h->nal_length_size,
> +                                 avctx->err_recognition, avctx);
>      }
>      if (h->is_avc && buf_size >= 9 && buf[0]==1 && buf[2]==0 && (buf[4]&0xFC)==0xFC) {
>          if (is_extra(buf, buf_size))

This looks similar to
https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200508020929.68603-1-ollywoodman@gmail.com/