[FFmpeg-devel,3/3] fftools/ffmpeg_filter: log an information message about filter graph reconfigurations

Filter graph reconfigurations can cause nontrivial issues, e.g. PTS
discontinuities, so it is better to warn the user about them.

Signed-off-by: Marton Balint <cus@passwd.hu>
---
 fftools/ffmpeg_filter.c | 50 ++++++++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 10 deletions(-)

On Fri, 29 Dec 2023, Marton Balint wrote:

> Filter graph reconfigurations can cause nontrivial issues, e.g. PTS
> discontinuities, so it is better to warn the user about them.
>

Will apply soon.

Regards,
Marton

> Signed-off-by: Marton Balint <cus@passwd.hu>
> ---
> fftools/ffmpeg_filter.c | 50 ++++++++++++++++++++++++++++++++---------
> 1 file changed, 40 insertions(+), 10 deletions(-)
>
> diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
> index 680fffb060..9dfc68a130 100644
> --- a/fftools/ffmpeg_filter.c
> +++ b/fftools/ffmpeg_filter.c
> @@ -2585,41 +2585,50 @@ static int send_eof(FilterGraphThread *fgt, InputFilter *ifilter,
>     return 0;
> }
>
> +enum ReinitReason {
> +    VIDEO_CHANGED   = (1 << 0),
> +    AUDIO_CHANGED   = (1 << 1),
> +    MATRIX_CHANGED  = (1 << 2),
> +    HWACCEL_CHANGED = (1 << 3)
> +};
> +
> static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
>                       InputFilter *ifilter, AVFrame *frame)
> {
>     InputFilterPriv *ifp = ifp_from_ifilter(ifilter);
>     FrameData       *fd;
>     AVFrameSideData *sd;
> -    int need_reinit, ret;
> +    int need_reinit = 0, ret;
>
>     /* determine if the parameters for this input changed */
> -    need_reinit = ifp->format != frame->format;
> -
>     switch (ifp->type) {
>     case AVMEDIA_TYPE_AUDIO:
> -        need_reinit |= ifp->sample_rate    != frame->sample_rate ||
> -                       av_channel_layout_compare(&ifp->ch_layout, &frame->ch_layout);
> +        if (ifp->format      != frame->format ||
> +            ifp->sample_rate != frame->sample_rate ||
> +            av_channel_layout_compare(&ifp->ch_layout, &frame->ch_layout))
> +            need_reinit |= AUDIO_CHANGED;
>         break;
>     case AVMEDIA_TYPE_VIDEO:
> -        need_reinit |= ifp->width  != frame->width ||
> -                       ifp->height != frame->height;
> +        if (ifp->format != frame->format ||
> +            ifp->width  != frame->width ||
> +            ifp->height != frame->height)
> +            need_reinit |= VIDEO_CHANGED;
>         break;
>     }
>
>     if (sd = av_frame_get_side_data(frame, AV_FRAME_DATA_DISPLAYMATRIX)) {
>         if (!ifp->displaymatrix_present ||
>             memcmp(sd->data, ifp->displaymatrix, sizeof(ifp->displaymatrix)))
> -            need_reinit = 1;
> +            need_reinit |= MATRIX_CHANGED;
>     } else if (ifp->displaymatrix_present)
> -        need_reinit = 1;
> +        need_reinit |= MATRIX_CHANGED;
>
>     if (!ifp->ist->reinit_filters && fgt->graph)
>         need_reinit = 0;
>
>     if (!!ifp->hw_frames_ctx != !!frame->hw_frames_ctx ||
>         (ifp->hw_frames_ctx && ifp->hw_frames_ctx->data != frame->hw_frames_ctx->data))
> -        need_reinit = 1;
> +        need_reinit |= HWACCEL_CHANGED;
>
>     if (need_reinit) {
>         ret = ifilter_parameters_from_frame(ifilter, frame);
> @@ -2649,6 +2658,27 @@ static int send_frame(FilterGraph *fg, FilterGraphThread *fgt,
>         if (ret < 0)
>             return ret;
>
> +        if (fgt->graph) {
> +            AVBPrint reason;
> +            av_bprint_init(&reason, 0, AV_BPRINT_SIZE_AUTOMATIC);
> +            if (need_reinit & AUDIO_CHANGED) {
> +                const char *fmtname = av_get_sample_fmt_name(frame->format);
> +                av_bprintf(&reason, ", audio parameters changed to %d Hz, ", frame->sample_rate);
> +                av_channel_layout_describe_bprint(&frame->ch_layout, &reason);
> +                av_bprintf(&reason, ", %s", fmtname ? fmtname : "?");
> +            }
> +            if (need_reinit & VIDEO_CHANGED) {
> +                const char *fmtname = av_get_pix_fmt_name(frame->format);
> +                av_bprintf(&reason, ", video parameters changed to %s, %dx%d",
> +                        fmtname ? fmtname : "?", frame->width, frame->height);
> +            }
> +            if (need_reinit & MATRIX_CHANGED)
> +                av_bprintf(&reason, ", display matrix changed");
> +            if (need_reinit & HWACCEL_CHANGED)
> +                av_bprintf(&reason, ", hwaccel changed");
> +            av_log(fg, AV_LOG_INFO, "Reconfiguring filter graph%s\n", reason.str);
> +        }
> +
>         ret = configure_filtergraph(fg, fgt);
>         if (ret < 0) {
>             av_log(fg, AV_LOG_ERROR, "Error reinitializing filters!\n");
> -- 
> 2.35.3
>
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