[FFmpeg-devel] [PATCH] lavfi: add inverse telecine filter
Himangi Saraogi
himangi774 at gmail.com
Fri Mar 27 06:37:18 CET 2015
---
Changelog | 1 +
doc/filters.texi | 27 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_detelecine.c | 345 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 375 insertions(+)
create mode 100644 libavfilter/vf_detelecine.c
diff --git a/Changelog b/Changelog
index b0d0414..81c6eab 100644
--- a/Changelog
+++ b/Changelog
@@ -9,6 +9,7 @@ version <next>:
- libdcadec wrapper
- Drop support for nvenc API before 5.0
- nvenc H265 encoder
+- Detelecine filter
version 2.6:
diff --git a/doc/filters.texi b/doc/filters.texi
index f2999f2..15f8ed5 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3728,6 +3728,33 @@ FFmpeg was configured with @code{--enable-opencl}. Default value is 0.
@end table
+ at section detelecine
+
+Apply an exact inverse of the telecine operation. It requires a predefined
+pattern specified using the pattern option which must be the same as that passed
+to the telecine filter.
+
+This filter accepts the following options:
+
+ at table @option
+ at item first_field
+ at table @samp
+ at item top, t
+top field first
+ at item bottom, b
+bottom field first
+The default value is @code{top}.
+ at end table
+
+ at item pattern
+A string of numbers representing the pulldown pattern you wish to apply.
+The default value is @code{23}.
+
+ at item start_frame
+A number representing position of the first frame with respect to the telecine
+pattern. This is to be used if the stream is cut. The default value is @code{0}.
+ at end table
+
@section drawbox
Draw a colored box on the input image.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 2cde029..73e7adf 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -112,6 +112,7 @@ OBJS-$(CONFIG_DECIMATE_FILTER) += vf_decimate.o
OBJS-$(CONFIG_DEJUDDER_FILTER) += vf_dejudder.o
OBJS-$(CONFIG_DELOGO_FILTER) += vf_delogo.o
OBJS-$(CONFIG_DESHAKE_FILTER) += vf_deshake.o
+OBJS-$(CONFIG_DETELECINE_FILTER) += vf_detelecine.o
OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWGRID_FILTER) += vf_drawbox.o
OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 0288082..6bc01c5 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -128,6 +128,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(DEJUDDER, dejudder, vf);
REGISTER_FILTER(DELOGO, delogo, vf);
REGISTER_FILTER(DESHAKE, deshake, vf);
+ REGISTER_FILTER(DETELECINE, detelecine, vf);
REGISTER_FILTER(DRAWBOX, drawbox, vf);
REGISTER_FILTER(DRAWGRID, drawgrid, vf);
REGISTER_FILTER(DRAWTEXT, drawtext, vf);
diff --git a/libavfilter/vf_detelecine.c b/libavfilter/vf_detelecine.c
new file mode 100644
index 0000000..27463fe
--- /dev/null
+++ b/libavfilter/vf_detelecine.c
@@ -0,0 +1,345 @@
+/*
+ * Copyright (c) 2015 Himangi Saraogi <himangi774 at gmail.com>
+ *
+ * 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
+ */
+
+/**
+ * @file detelecine filter.
+ */
+
+
+#include "libavutil/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct {
+ const AVClass *class;
+ int first_field;
+ char *pattern;
+ int start_frame;
+ unsigned int pattern_pos;
+ unsigned int nskip_fields;
+ int64_t start_time;
+
+ AVRational pts;
+ double ts_unit;
+ int occupied;
+
+ int nb_planes;
+ int planeheight[4];
+ int stride[4];
+
+ AVFrame *frame;
+ AVFrame *temp;
+} DetelecineContext;
+
+#define OFFSET(x) offsetof(DetelecineContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption detelecine_options[] = {
+ {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
+ {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
+ {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
+ {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
+ {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
+ {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
+ {"start_frame", "position of first frame with respect to the pattern if stream is cut", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64=0}, 0, 13, FLAGS},
+ {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(detelecine);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ DetelecineContext *s = ctx->priv;
+ const char *p;
+ int max = 0;
+
+ if (!strlen(s->pattern)) {
+ av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ for (p = s->pattern; *p; p++) {
+ if (!av_isdigit(*p)) {
+ av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ max = FFMAX(*p - '0', max);
+ s->pts.num += *p - '0';
+ s->pts.den += 2;
+ }
+
+ s->nskip_fields = 0;
+ s->pattern_pos = 0;
+ s->start_time = AV_NOPTS_VALUE;
+
+ if (s->start_frame != 0) {
+ int nfields = 0;
+ for (p = s->pattern; *p; p++) {
+ nfields += *p - '0';
+ s->pattern_pos++;
+ if (nfields >= 2*s->start_frame) {
+ s->nskip_fields = nfields - 2*s->start_frame;
+ break;
+ }
+ }
+ }
+
+ av_log(ctx, AV_LOG_INFO, "Detelecine pattern %s removes up to %d frames per frame, pts advance factor: %d/%d\n",
+ s->pattern, (max + 1) / 2, s->pts.num, s->pts.den);
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *pix_fmts = NULL;
+ int fmt;
+
+ for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+ if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
+ desc->flags & AV_PIX_FMT_FLAG_PAL ||
+ desc->flags & AV_PIX_FMT_FLAG_BITSTREAM))
+ ff_add_format(&pix_fmts, fmt);
+ }
+
+ ff_set_common_formats(ctx, pix_fmts);
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ DetelecineContext *s = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int ret;
+
+ s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
+ if (!s->temp)
+ return AVERROR(ENOMEM);
+
+ s->frame = ff_get_video_buffer(inlink, inlink->w, inlink->h);
+ if (!s->frame)
+ return AVERROR(ENOMEM);
+
+ if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+ s->planeheight[0] = s->planeheight[3] = inlink->h;
+
+ s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ DetelecineContext *s = ctx->priv;
+ const AVFilterLink *inlink = ctx->inputs[0];
+ AVRational fps = inlink->frame_rate;
+
+ if (!fps.num || !fps.den) {
+ av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
+ "current rate of %d/%d is invalid\n", fps.num, fps.den);
+ return AVERROR(EINVAL);
+ }
+ fps = av_mul_q(fps, av_inv_q(s->pts));
+ av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
+ inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
+
+ outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+ outlink->frame_rate = fps;
+ outlink->time_base = av_mul_q(inlink->time_base, s->pts);
+ av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
+ inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
+
+ s->ts_unit = av_q2d(av_inv_q(av_mul_q(fps, outlink->time_base)));
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ DetelecineContext *s = ctx->priv;
+ int i, len = 0, ret = 0, out = 0;
+
+ if (s->start_time == AV_NOPTS_VALUE)
+ s->start_time = inpicref->pts;
+
+ if (s->nskip_fields >= 2) {
+ s->nskip_fields -= 2;
+ return 0;
+ } else if (s->nskip_fields >= 1) {
+ if (s->occupied) {
+ s->occupied = 0;
+ s->nskip_fields--;
+ }
+ else {
+ for (i = 0; i < s->nb_planes; i++) {
+ av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
+ inpicref->data[i], inpicref->linesize[i],
+ s->stride[i],
+ s->planeheight[i]);
+ }
+ s->occupied = 1;
+ s->nskip_fields--;
+ return 0;
+ }
+ }
+
+ if (s->nskip_fields == 0) {
+ while(!len && s->pattern[s->pattern_pos]) {
+ len = s->pattern[s->pattern_pos] - '0';
+ s->pattern_pos++;
+ }
+
+ if (!s->pattern[s->pattern_pos])
+ s->pattern_pos = 0;
+
+ if(!len) { // do not output any field as the entire pattern is zero
+ av_frame_free(&inpicref);
+ return 0;
+ }
+
+ if (s->occupied) {
+ for (i = 0; i < s->nb_planes; i++) {
+ // fill in the EARLIER field from the new pic
+ av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * s->first_field,
+ s->frame->linesize[i] * 2,
+ inpicref->data[i] + inpicref->linesize[i] * s->first_field,
+ inpicref->linesize[i] * 2,
+ s->stride[i],
+ (s->planeheight[i] - s->first_field + 1) / 2);
+ // fill in the LATER field from the buffered pic
+ av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * !s->first_field,
+ s->frame->linesize[i] * 2,
+ s->temp->data[i] + s->temp->linesize[i] * !s->first_field,
+ s->temp->linesize[i] * 2,
+ s->stride[i],
+ (s->planeheight[i] - !s->first_field + 1) / 2);
+ }
+ len -= 2;
+ for (i = 0; i < s->nb_planes; i++) {
+ av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
+ inpicref->data[i], inpicref->linesize[i],
+ s->stride[i],
+ s->planeheight[i]);
+ }
+ s->occupied = 1;
+ out = 1;
+ } else {
+ if (len >= 2) {
+ // output THIS image as-is
+ for (i = 0; i < s->nb_planes; i++)
+ av_image_copy_plane(s->frame->data[i], s->frame->linesize[i],
+ inpicref->data[i], inpicref->linesize[i],
+ s->stride[i],
+ s->planeheight[i]);
+ len -= 2;
+ out = 1;
+ } else if (len == 1) {
+ // fill in the EARLIER field from the new pic
+ av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * s->first_field,
+ s->frame->linesize[i] * 2,
+ inpicref->data[i] + inpicref->linesize[i] * s->first_field,
+ inpicref->linesize[i] * 2,
+ s->stride[i],
+ (s->planeheight[i] - s->first_field + 1) / 2);
+ // TODO: not sure about the other field
+
+ len--;
+ out = 1;
+ }
+ }
+
+ if (len == 1 && s->occupied)
+ {
+ len--;
+ s->occupied = 0;
+ }
+ }
+ s->nskip_fields = len;
+
+ if (out) {
+ AVFrame *frame = av_frame_clone(s->frame);
+
+ if (!frame) {
+ av_frame_free(&inpicref);
+ return AVERROR(ENOMEM);
+ }
+
+ av_frame_copy_props(frame, inpicref);
+ frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
+ outlink->frame_count * s->ts_unit;
+ ret = ff_filter_frame(outlink, frame);
+ }
+
+ av_frame_free(&inpicref);
+
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ DetelecineContext *s = ctx->priv;
+
+ av_frame_free(&s->temp);
+ av_frame_free(&s->frame);
+}
+
+static const AVFilterPad detelecine_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ { NULL }
+};
+
+static const AVFilterPad detelecine_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_detelecine = {
+ .name = "detelecine",
+ .description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."),
+ .priv_size = sizeof(DetelecineContext),
+ .priv_class = &detelecine_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = detelecine_inputs,
+ .outputs = detelecine_outputs,
+};
--
1.9.1
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