libavfilter: Add asettb filter for setting timebase for audio

[ffmpeg] / libavfilter / vf_blackframe.c

diff --git a/libavfilter/vf_blackframe.c b/libavfilter/vf_blackframe.c
index 275ebb20709bf6a93f2ba29f8e2a9c85f3bd87da..039f05549573b5e979e2c74d3ddb731056d12416 100644 (file)
--- a/libavfilter/vf_blackframe.c
+++ b/libavfilter/vf_blackframe.c
@@ -31,14 +31,17 @@
 #include <inttypes.h>
 
 #include "libavutil/internal.h"
+#include "libavutil/opt.h"
+
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
 
 typedef struct {
-    unsigned int bamount; ///< black amount
-    unsigned int bthresh; ///< black threshold
+    const AVClass *class;
+    int bamount;          ///< black amount
+    int bthresh;          ///< black threshold
     unsigned int frame;   ///< frame number
     unsigned int nblack;  ///< number of black pixels counted so far
 } BlackFrameContext;
@@ -55,54 +58,48 @@ static int query_formats(AVFilterContext *ctx)
     return 0;
 }
 
-static av_cold int init(AVFilterContext *ctx, const char *args)
-{
-    BlackFrameContext *blackframe = ctx->priv;
-
-    blackframe->bamount = 98;
-    blackframe->bthresh = 32;
-    blackframe->nblack = 0;
-    blackframe->frame = 0;
-
-    if (args)
-        sscanf(args, "%u:%u", &blackframe->bamount, &blackframe->bthresh);
-
-    av_log(ctx, AV_LOG_VERBOSE, "bamount:%u bthresh:%u\n",
-           blackframe->bamount, blackframe->bthresh);
-
-    if (blackframe->bamount > 100 || blackframe->bthresh > 255) {
-        av_log(ctx, AV_LOG_ERROR, "Too big value for bamount (max is 100) or bthresh (max is 255)\n");
-        return AVERROR(EINVAL);
-    }
-
-    return 0;
-}
-
-static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 {
     AVFilterContext *ctx = inlink->dst;
-    BlackFrameContext *blackframe = ctx->priv;
+    BlackFrameContext *s = ctx->priv;
     int x, i;
     int pblack = 0;
     uint8_t *p = frame->data[0];
 
-    for (i = 0; i < frame->video->h; i++) {
+    for (i = 0; i < frame->height; i++) {
         for (x = 0; x < inlink->w; x++)
-            blackframe->nblack += p[x] < blackframe->bthresh;
+            s->nblack += p[x] < s->bthresh;
         p += frame->linesize[0];
     }
 
-    pblack = blackframe->nblack * 100 / (inlink->w * inlink->h);
-    if (pblack >= blackframe->bamount)
-        av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pos:%"PRId64" pts:%"PRId64" t:%f\n",
-               blackframe->frame, pblack, frame->pos, frame->pts,
+    pblack = s->nblack * 100 / (inlink->w * inlink->h);
+    if (pblack >= s->bamount)
+        av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pts:%"PRId64" t:%f\n",
+               s->frame, pblack, frame->pts,
                frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base));
 
-    blackframe->frame++;
-    blackframe->nblack = 0;
+    s->frame++;
+    s->nblack = 0;
     return ff_filter_frame(inlink->dst->outputs[0], frame);
 }
 
+#define OFFSET(x) offsetof(BlackFrameContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption options[] = {
+    { "amount", "Percentage of the pixels that have to be below the threshold "
+        "for the frame to be considered black.", OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100,     FLAGS },
+    { "threshold", "threshold below which a pixel value is considered black",
+                                                 OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, INT_MAX, FLAGS },
+    { NULL },
+};
+
+static const AVClass blackframe_class = {
+    .class_name = "blackframe",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 static const AVFilterPad avfilter_vf_blackframe_inputs[] = {
     {
         .name             = "default",
@@ -121,12 +118,12 @@ static const AVFilterPad avfilter_vf_blackframe_outputs[] = {
     { NULL }
 };
 
-AVFilter avfilter_vf_blackframe = {
+AVFilter ff_vf_blackframe = {
     .name        = "blackframe",
     .description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
 
     .priv_size = sizeof(BlackFrameContext),
-    .init      = init,
+    .priv_class = &blackframe_class,
 
     .query_formats = query_formats,