[FFmpeg-devel] [PATCH v10 3/4] avcodec/hevc_sei: add support for user data unregistered SEI message

[lance.lmwang at gmail.com]

On Wed, Jun 10, 2020 at 10:49:33AM +0200, Marton Balint wrote:
> 
> 
> On Wed, 10 Jun 2020, lance.lmwang at gmail.com wrote:
> 
> > From: Limin Wang <lance.lmwang at gmail.com>
> > 
> > Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> > ---
> > libavfilter/vf_showinfo.c | 37 +++++++++++++++++++++++++++++++++++++
> 
> Commit subject is wrong.
> 
> > 1 file changed, 37 insertions(+)
> > 
> > diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
> > index 5d4aee4..9eaf8ff 100644
> > --- a/libavfilter/vf_showinfo.c
> > +++ b/libavfilter/vf_showinfo.c
> > @@ -23,6 +23,7 @@
> >  */
> > 
> > #include <inttypes.h>
> > +#include <ctype.h>
> 
> Use av_isgraph() instead, ctype is locale dependant.

It seems that av_isgraph() isn't include all printable ascii, see:

https://en.wikipedia.org/wiki/ASCII
Codes 20hex to 7Ehex, known as the printable characters, represent letters, digits, punctuation marks,
and a few miscellaneous symbols. There are 95 printable characters in total.

So I'll not use av_isgraph() and use below code:
while (*str && *str >= 0x20 && *str <= 0x7e ) str++;

You can test with x264 default SEI user data for check.

> 
> Regards,
> Marton
> 
> > 
> > #include "libavutil/bswap.h"
> > #include "libavutil/adler32.h"
> > @@ -190,6 +191,39 @@ static void dump_video_enc_params(AVFilterContext *ctx, AVFrameSideData *sd)
> >         av_log(ctx, AV_LOG_INFO, "%u blocks; ", par->nb_blocks);
> > }
> > 
> > +static int string_is_print(const uint8_t *str)
> > +{
> > +    while (isprint(*str)) str++;
> > +    return !*str;
> > +}
> > +
> > +static void dump_sei_unregistered_metadata(AVFilterContext *ctx, AVFrameSideData *sd)
> > +{
> > +    const int uuid_size = 16;
> > +    uint8_t *user_data = sd->data;
> > +
> > +    if (sd->size < uuid_size) {
> > +        av_log(ctx, AV_LOG_ERROR, "invalid data(%d < UUID(%d-bytes))", sd->size, uuid_size);
> > +        return;
> > +    }
> > +
> > +    av_log(ctx, AV_LOG_INFO, "User Data Unregistered:\n");
> > +    av_log(ctx, AV_LOG_INFO, "UUID=");
> > +    for (int i = 0; i < uuid_size; i++) {
> > +        av_log(ctx, AV_LOG_INFO, "%02x", user_data[i]);
> > +        if (i == 3 || i == 5 || i == 7 || i == 9)
> > +            av_log(ctx, AV_LOG_INFO, "-");
> > +    }
> > +    av_log(ctx, AV_LOG_INFO, "\n");
> > +
> > +    user_data += uuid_size;
> > +    /* Only print the user data details if it's string */
> > +    if (string_is_print(user_data)) {
> > +        av_log(ctx, AV_LOG_INFO, "User Data=");
> > +        av_log(ctx, AV_LOG_INFO, "%s", user_data);
> > +    }
> > +}
> > +
> > static void dump_color_property(AVFilterContext *ctx, AVFrame *frame)
> > {
> >     const char *color_range_str     = av_color_range_name(frame->color_range);
> > @@ -375,6 +409,9 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
> >         case AV_FRAME_DATA_VIDEO_ENC_PARAMS:
> >             dump_video_enc_params(ctx, sd);
> >             break;
> > +        case AV_FRAME_DATA_SEI_UNREGISTERED:
> > +            dump_sei_unregistered_metadata(ctx, sd);
> > +            break;
> >         default:
> >             av_log(ctx, AV_LOG_WARNING, "unknown side data type %d (%d bytes)",
> >                    sd->type, sd->size);
> > -- 
> > 1.8.3.1
> > 
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> > 
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-- 
Thanks,
Limin Wang