avfilter/af_channelsplit: switch to activate()

libavfilter/af_channelsplit.c

@@ -30,6 +30,7 @@
 
 #include "audio.h"
 #include "avfilter.h"
+#include "filters.h"
 #include "formats.h"
 #include "internal.h"
 
@@ -131,38 +132,79 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
+static int filter_frame(AVFilterLink *outlink, AVFrame *buf)
 {
-    AVFilterContext *ctx = inlink->dst;
+    AVFilterContext *ctx = outlink->src;
     ChannelSplitContext *s = ctx->priv;
-    int i, ret = 0;
+    const int i = FF_OUTLINK_IDX(outlink);
 
-    for (i = 0; i < ctx->nb_outputs; i++) {
-        AVFrame *buf_out = av_frame_clone(buf);
+    AVFrame *buf_out = av_frame_clone(buf);
+    if (!buf_out)
+        return AVERROR(ENOMEM);
 
-        if (!buf_out) {
-            ret = AVERROR(ENOMEM);
-            break;
-        }
+    buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
+    buf_out->channel_layout =
+        av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
+    buf_out->channels = 1;
+
+    return ff_filter_frame(ctx->outputs[i], buf_out);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+    AVFilterLink *inlink = ctx->inputs[0];
+    int status, ret;
+    AVFrame *in;
+    int64_t pts;
+
+    for (int i = 0; i < ctx->nb_outputs; i++) {
+        FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);
+    }
 
-        buf_out->data[0] = buf_out->extended_data[0] = buf_out->extended_data[s->map[i]];
-        buf_out->channel_layout =
-            av_channel_layout_extract_channel(buf->channel_layout, s->map[i]);
-        buf_out->channels = 1;
+    ret = ff_inlink_consume_frame(inlink, &in);
+    if (ret < 0)
+        return ret;
+    if (ret > 0) {
+        for (int i = 0; i < ctx->nb_outputs; i++) {
+            if (ff_outlink_get_status(ctx->outputs[i]))
+                continue;
+
+            ret = filter_frame(ctx->outputs[i], in);
+            if (ret < 0)
+                break;
+        }
 
-        ret = ff_filter_frame(ctx->outputs[i], buf_out);
+        av_frame_free(&in);
         if (ret < 0)
-            break;
+            return ret;
     }
-    av_frame_free(&buf);
-    return ret;
+
+    if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
+        for (int i = 0; i < ctx->nb_outputs; i++) {
+            if (ff_outlink_get_status(ctx->outputs[i]))
+                continue;
+            ff_outlink_set_status(ctx->outputs[i], status, pts);
+        }
+        return 0;
+    }
+
+    for (int i = 0; i < ctx->nb_outputs; i++) {
+        if (ff_outlink_get_status(ctx->outputs[i]))
+            continue;
+
+        if (ff_outlink_frame_wanted(ctx->outputs[i])) {
+            ff_inlink_request_frame(inlink);
+            return 0;
+        }
+    }
+
+    return FFERROR_NOT_READY;
 }
 
 static const AVFilterPad avfilter_af_channelsplit_inputs[] = {
     {
         .name         = "default",
         .type         = AVMEDIA_TYPE_AUDIO,
-        .filter_frame = filter_frame,
     },
 };
 
@@ -172,6 +214,7 @@ const AVFilter ff_af_channelsplit = {
     .priv_size      = sizeof(ChannelSplitContext),
     .priv_class     = &channelsplit_class,
     .init           = init,
+    .activate       = activate,
     FILTER_INPUTS(avfilter_af_channelsplit_inputs),
     .outputs        = NULL,
     FILTER_QUERY_FUNC(query_formats),