avfilter/avf_abitscope: switch to activate

libavfilter/avf_abitscope.c

@@ -24,6 +24,7 @@
 #include "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include "avfilter.h"
+#include "filters.h"
 #include "formats.h"
 #include "audio.h"
 #include "video.h"
@@ -36,6 +37,7 @@ typedef struct AudioBitScopeContext {
     char *colors;
 
     int nb_channels;
+    int nb_samples;
     int depth;
     uint8_t *fg;
 
@@ -91,13 +93,10 @@ static int config_input(AVFilterLink *inlink)
 {
     AVFilterContext *ctx = inlink->dst;
     AudioBitScopeContext *s = ctx->priv;
-    int ch, nb_samples;
+    int ch;
     char *colors, *saveptr = NULL;
 
-    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(1, ((double)inlink->sample_rate / av_q2d(s->frame_rate)) + 0.5);
     s->nb_channels = inlink->channels;
     s->depth = inlink->format == AV_SAMPLE_FMT_S16P ? 16 : 32;
 
@@ -222,12 +221,33 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *insamples)
     return ff_filter_frame(outlink, outpicref);
 }
 
+static int activate(AVFilterContext *ctx)
+{
+    AVFilterLink *inlink = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+    AudioBitScopeContext *s = ctx->priv;
+    AVFrame *in;
+    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 const AVFilterPad inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
         .config_props = config_input,
-        .filter_frame = filter_frame,
     },
     { NULL }
 };
@@ -248,5 +268,6 @@ AVFilter ff_avf_abitscope = {
     .priv_size     = sizeof(AudioBitScopeContext),
     .inputs        = inputs,
     .outputs       = outputs,
+    .activate      = activate,
     .priv_class    = &abitscope_class,
 };