[FFmpeg-cvslog] libavfilter: Add interlace detect filter.
Michael Niedermayer
git at videolan.org
Wed Apr 4 15:33:28 CEST 2012
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Apr 3 15:56:04 2012 +0200| [e3e89b6d8b6c7a67fcde4c8ad6f4ad9155d14e6f] | committer: Michael Niedermayer
libavfilter: Add interlace detect filter.
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3e89b6d8b6c7a67fcde4c8ad6f4ad9155d14e6f
---
doc/filters.texi | 5 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_idet.c | 270 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 277 insertions(+), 0 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 2091242..78e5be9 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1695,6 +1695,11 @@ a float number which specifies chroma temporal strength, defaults to
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}
@end table
+ at section idet
+
+Interlaceing detect filter. This filter tries to detect if the input is
+interlaced or progressive. Top or bottom field first.
+
@section lut, lutrgb, lutyuv
Compute a look-up table for binding each pixel component input value
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 66d305d..5ab4e81 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -67,6 +67,7 @@ OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
+OBJS-$(CONFIG_IDET_FILTER) += vf_idet.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTRGB_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTYUV_FILTER) += vf_lut.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 7715db3..f71246e 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -75,6 +75,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (GRADFUN, gradfun, vf);
REGISTER_FILTER (HFLIP, hflip, vf);
REGISTER_FILTER (HQDN3D, hqdn3d, vf);
+ REGISTER_FILTER (IDET, idet, vf);
REGISTER_FILTER (LUT, lut, vf);
REGISTER_FILTER (LUTRGB, lutrgb, vf);
REGISTER_FILTER (LUTYUV, lutyuv, vf);
diff --git a/libavfilter/vf_idet.c b/libavfilter/vf_idet.c
new file mode 100644
index 0000000..cd801b9
--- /dev/null
+++ b/libavfilter/vf_idet.c
@@ -0,0 +1,270 @@
+/*
+ * Copyright (C) 2012 Michael Niedermayer <michaelni at gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/cpu.h"
+#include "libavutil/common.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+typedef struct {
+ float interlace_threshold;
+ float progressive_threshold;
+
+ AVFilterBufferRef *cur;
+ AVFilterBufferRef *next;
+ AVFilterBufferRef *prev;
+ AVFilterBufferRef *out;
+ int (*filter_line)(uint8_t *prev, uint8_t *cur, uint8_t *next, int w);
+
+ const AVPixFmtDescriptor *csp;
+} IDETContext;
+
+
+static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
+{
+ int x;
+ int ret=0;
+
+ for(x=0; x<w; x++){
+ ret += FFABS((*a++ + *c++) - 2 * *b++);
+ }
+
+ return ret;
+}
+
+static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
+{
+ int x;
+ int ret=0;
+
+ for(x=0; x<w; x++){
+ ret += FFABS((*a++ + *c++) - 2 * *b++);
+ }
+
+ return ret;
+}
+
+static void filter(AVFilterContext *ctx)
+{
+ IDETContext *idet = ctx->priv;
+ int y, i;
+ int64_t alpha[2]={0};
+ int64_t delta=0;
+ static int p=0, t=0, b=0, u=0;
+
+ for (i = 0; i < idet->csp->nb_components; i++) {
+ int w = idet->cur->video->w;
+ int h = idet->cur->video->h;
+ int refs = idet->cur->linesize[i];
+ int df = (idet->csp->comp[i].depth_minus1 + 8) / 8;
+
+ if (i && i<3) {
+ w >>= idet->csp->log2_chroma_w;
+ h >>= idet->csp->log2_chroma_h;
+ }
+
+ for (y = 2; y < h - 2; y++) {
+ uint8_t *prev = &idet->prev->data[i][y*refs];
+ uint8_t *cur = &idet->cur ->data[i][y*refs];
+ uint8_t *next = &idet->next->data[i][y*refs];
+ alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
+ alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
+ delta += idet->filter_line(cur-refs, cur, cur+refs, w);
+ }
+ }
+#if HAVE_MMX
+ __asm__ volatile("emms \n\t" : : : "memory");
+#endif
+
+ if (alpha[0] / (float)alpha[1] > idet->interlace_threshold){
+ av_log(0, AV_LOG_INFO, "Interlaced, top field first\n");
+ t++;
+ }else if(alpha[1] / (float)alpha[0] > idet->interlace_threshold){
+ av_log(0, AV_LOG_INFO, "Interlaced, bottom field first\n");
+ b++;
+ }else if(alpha[1] / (float)delta > idet->progressive_threshold){
+ av_log(0, AV_LOG_INFO, "Progressive\n");
+ p++;
+ }else{
+ av_log(0, AV_LOG_INFO, "Undetermined\n");
+ u++;
+ }
+// av_log(0,0, "t%d b%d p%d u%d\n", t,b,p,u);
+}
+
+static void return_frame(AVFilterContext *ctx)
+{
+}
+
+static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
+{
+ AVFilterContext *ctx = link->dst;
+ IDETContext *idet = ctx->priv;
+
+ if (idet->prev)
+ avfilter_unref_buffer(idet->prev);
+ idet->prev = idet->cur;
+ idet->cur = idet->next;
+ idet->next = picref;
+
+ if (!idet->cur)
+ return;
+
+ if (!idet->prev)
+ idet->prev = avfilter_ref_buffer(idet->cur, AV_PERM_READ);
+
+ avfilter_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
+}
+
+static void end_frame(AVFilterLink *link)
+{
+ AVFilterContext *ctx = link->dst;
+ IDETContext *idet = ctx->priv;
+
+ if (!idet->cur)
+ return;
+
+ if (!idet->csp)
+ idet->csp = &av_pix_fmt_descriptors[link->format];
+ if (idet->csp->comp[0].depth_minus1 / 8 == 1)
+ idet->filter_line = (void*)filter_line_c_16bit;
+
+ filter(ctx);
+
+ avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
+ avfilter_end_frame(ctx->outputs[0]);
+}
+
+static int request_frame(AVFilterLink *link)
+{
+ AVFilterContext *ctx = link->src;
+ IDETContext *idet = ctx->priv;
+
+ do {
+ int ret;
+
+ if ((ret = avfilter_request_frame(link->src->inputs[0])))
+ return ret;
+ } while (!idet->cur);
+
+ return 0;
+}
+
+static int poll_frame(AVFilterLink *link)
+{
+ IDETContext *idet = link->src->priv;
+ int ret, val;
+
+ val = avfilter_poll_frame(link->src->inputs[0]);
+
+ if (val >= 1 && !idet->next) { //FIXME change API to not requre this red tape
+ if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
+ return ret;
+ val = avfilter_poll_frame(link->src->inputs[0]);
+ }
+ assert(idet->next || !val);
+
+ return val;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ IDETContext *idet = ctx->priv;
+
+ if (idet->prev) avfilter_unref_buffer(idet->prev);
+ if (idet->cur ) avfilter_unref_buffer(idet->cur );
+ if (idet->next) avfilter_unref_buffer(idet->next);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV420P,
+ PIX_FMT_YUV422P,
+ PIX_FMT_YUV444P,
+ PIX_FMT_YUV410P,
+ PIX_FMT_YUV411P,
+ PIX_FMT_GRAY8,
+ PIX_FMT_YUVJ420P,
+ PIX_FMT_YUVJ422P,
+ PIX_FMT_YUVJ444P,
+ AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
+ PIX_FMT_YUV440P,
+ PIX_FMT_YUVJ440P,
+ AV_NE( PIX_FMT_YUV420P10BE, PIX_FMT_YUV420P10LE ),
+ AV_NE( PIX_FMT_YUV422P10BE, PIX_FMT_YUV422P10LE ),
+ AV_NE( PIX_FMT_YUV444P10BE, PIX_FMT_YUV444P10LE ),
+ AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
+ AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
+ AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
+ PIX_FMT_YUVA420P,
+ PIX_FMT_NONE
+ };
+
+ avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ IDETContext *idet = ctx->priv;
+ int cpu_flags = av_get_cpu_flags();
+
+ idet->csp = NULL;
+
+ idet->interlace_threshold = 1.01;
+ idet->progressive_threshold = 2.5;
+
+ if (args) sscanf(args, "%f:%f", &idet->interlace_threshold, &idet->progressive_threshold);
+
+ idet->filter_line = filter_line_c;
+
+ return 0;
+}
+
+static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+
+AVFilter avfilter_vf_idet = {
+ .name = "idet",
+ .description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
+
+ .priv_size = sizeof(IDETContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+
+ .inputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .start_frame = start_frame,
+ .draw_slice = null_draw_slice,
+ .end_frame = end_frame,
+ .rej_perms = AV_PERM_REUSE2, },
+ { .name = NULL}},
+
+ .outputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .poll_frame = poll_frame,
+ .request_frame = request_frame, },
+ { .name = NULL}},
+};
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