[FFmpeg-devel] [PATCH v3 2/2] libavformat/img2dec: Added pgx demuxer

[Carl Eugen Hoyos]

Am So., 28. Juni 2020 um 16:43 Uhr schrieb <gautamramk at gmail.com>:
>
> From: Gautam Ramakrishnan <gautamramk at gmail.com>
>
> This patch adds support to demux pgx file
> format.

Has anything changed compared to earlier versions?

> ---
>  libavformat/allformats.c |  1 +
>  libavformat/img2dec.c    | 10 ++++++++++
>  libavformat/version.h    |  2 +-
>  3 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/libavformat/allformats.c b/libavformat/allformats.c
> index 97fd06debb..f8527b1fd4 100644
> --- a/libavformat/allformats.c
> +++ b/libavformat/allformats.c
> @@ -488,6 +488,7 @@ extern AVInputFormat  ff_image_pbm_pipe_demuxer;
>  extern AVInputFormat  ff_image_pcx_pipe_demuxer;
>  extern AVInputFormat  ff_image_pgmyuv_pipe_demuxer;
>  extern AVInputFormat  ff_image_pgm_pipe_demuxer;
> +extern AVInputFormat  ff_image_pgx_pipe_demuxer;
>  extern AVInputFormat  ff_image_pictor_pipe_demuxer;
>  extern AVInputFormat  ff_image_png_pipe_demuxer;
>  extern AVInputFormat  ff_image_ppm_pipe_demuxer;
> diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
> index ee7ceed08f..ec27e04a30 100644
> --- a/libavformat/img2dec.c
> +++ b/libavformat/img2dec.c
> @@ -1000,6 +1000,15 @@ static int pgmyuv_probe(const AVProbeData *p) // custom FFmpeg format recognized
>      return ret && av_match_ext(p->filename, "pgmyuv") ? ret : 0;
>  }
>
> +static int pgx_probe(const AVProbeData *p)
> +{
> +    const uint8_t *b = p->buf;
> +    int ret = (AV_RB64(b) & 0xFFFFFFFFFFFF0000) == 0x5047204D4C200000;
> +    if (ret)
> +        return AVPROBE_SCORE_EXTENSION + 1;
> +    return 0;

Why is the variable ret useful?

Carl Eugen