* Ported from MPlayer libmpcodecs/vf_blackframe.c.
*/
+#include <stdio.h>
+#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
+typedef struct BlackFrameContext {
+ 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;
static int query_formats(AVFilterContext *ctx)
{
- static const enum PixelFormat pix_fmts[] = {
- PIX_FMT_YUV410P, PIX_FMT_YUV420P, PIX_FMT_GRAY8, PIX_FMT_NV12,
- PIX_FMT_NV21, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P,
- PIX_FMT_NONE
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
+ AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
+ AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
-static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
-{
- 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_INFO, "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 void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
AVFilterContext *ctx = inlink->dst;
- BlackFrameContext *blackframe = ctx->priv;
- AVFilterBufferRef *picref = inlink->cur_buf;
+ BlackFrameContext *s = ctx->priv;
int x, i;
- uint8_t *p = picref->data[0] + y * picref->linesize[0];
+ int pblack = 0;
+ uint8_t *p = frame->data[0];
- for (i = 0; i < h; i++) {
+ for (i = 0; i < frame->height; i++) {
for (x = 0; x < inlink->w; x++)
- blackframe->nblack += p[x] < blackframe->bthresh;
- p += picref->linesize[0];
+ s->nblack += p[x] < s->bthresh;
+ p += frame->linesize[0];
}
- ff_draw_slice(ctx->outputs[0], y, h, slice_dir);
+ 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));
+
+ s->frame++;
+ s->nblack = 0;
+ return ff_filter_frame(inlink->dst->outputs[0], frame);
}
-static void end_frame(AVFilterLink *inlink)
-{
- AVFilterContext *ctx = inlink->dst;
- BlackFrameContext *blackframe = ctx->priv;
- AVFilterBufferRef *picref = inlink->cur_buf;
- int pblack = 0;
+#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 },
+};
- 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, picref->pos, picref->pts,
- picref->pts == AV_NOPTS_VALUE ? -1 : picref->pts * av_q2d(inlink->time_base));
+static const AVClass blackframe_class = {
+ .class_name = "blackframe",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
- blackframe->frame++;
- blackframe->nblack = 0;
- ff_end_frame(inlink->dst->outputs[0]);
-}
+static const AVFilterPad avfilter_vf_blackframe_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
-AVFilter avfilter_vf_blackframe = {
+static const AVFilterPad avfilter_vf_blackframe_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO
+ },
+ { NULL }
+};
+
+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,
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .draw_slice = draw_slice,
- .get_video_buffer = ff_null_get_video_buffer,
- .start_frame = ff_null_start_frame,
- .end_frame = end_frame, },
- { .name = NULL}},
-
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO },
- { .name = NULL}},
+ .inputs = avfilter_vf_blackframe_inputs,
+
+ .outputs = avfilter_vf_blackframe_outputs,
};
projects / ffmpeg / blobdiff