avfilter/avf_showvolume: switch to activate

libavfilter/avf_showvolume.c

@@ -26,6 +26,7 @@
 #include "libavutil/parseutils.h"
 #include "libavutil/xga_font_data.h"
 #include "avfilter.h"
+#include "filters.h"
 #include "formats.h"
 #include "audio.h"
 #include "video.h"
@@ -47,6 +48,7 @@ typedef struct ShowVolumeContext {
     float bgopacity;
     int mode;
 
+    int nb_samples;
     AVFrame *out;
     AVExpr *c_expr;
     int draw_text;
@@ -162,12 +164,8 @@ static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     ShowVolumeContext *s = ctx->priv;
-    int nb_samples;
 
-    nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
-    inlink->partial_buf_size =
-    inlink->min_samples =
-    inlink->max_samples = nb_samples;
+    s->nb_samples = FFMAX(1024, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
     s->values = av_calloc(inlink->channels * VAR_VARS_NB, sizeof(double));
     if (!s->values)
         return AVERROR(ENOMEM);
@@ -449,6 +447,28 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
     return ff_filter_frame(outlink, out);
 }
 
+static int activate(AVFilterContext *ctx)
+{
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    ShowVolumeContext *s = ctx->priv;
+    AVFrame *in = NULL;
+    int ret;
+
+    FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
+
+    ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
+    if (ret < 0)
+        return ret;
+    if (ret > 0)
+        return filter_frame(inlink, in);
+
+    FF_FILTER_FORWARD_STATUS(inlink, outlink);
+    FF_FILTER_FORWARD_WANTED(outlink, inlink);
+
+    return FFERROR_NOT_READY;
+}
+
 static av_cold void uninit(AVFilterContext *ctx)
 {
     ShowVolumeContext *s = ctx->priv;
@@ -465,7 +485,6 @@ static const AVFilterPad showvolume_inputs[] = {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
         .config_props = config_input,
-        .filter_frame = filter_frame,
     },
     { NULL }
 };
@@ -483,6 +502,7 @@ AVFilter ff_avf_showvolume = {
     .name          = "showvolume",
     .description   = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
     .init          = init,
+    .activate      = activate,
     .uninit        = uninit,
     .query_formats = query_formats,
     .priv_size     = sizeof(ShowVolumeContext),