Dana 27. 3. 2015. 15:07 osoba "Himangi Saraogi" <himangi...@gmail.com>
napisala je:
>
> ---
> Changelog | 1 +
> doc/filters.texi | 27 ++++
> libavfilter/Makefile | 1 +
> libavfilter/allfilters.c | 1 +
> libavfilter/vf_detelecine.c | 346
++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 376 insertions(+)
> create mode 100644 libavfilter/vf_detelecine.c
>
This looks like derivate of telecine filter.
> 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
> +- Detelec
>
> 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
>
> +@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:
> +
> +@table @option
> +@item first_field
> +@table @samp
> +@item top, t
> +top field first
> +@item bottom, b
> +bottom field first
> +The default value is @code{top}.
> +@end table
> +
> +@item pattern
> +A string of numbers representing the pulldown pattern you wish to apply.
> +The default value is @code{23}.
> +
> +@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}.
> +@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..218a8c8
> --- /dev/null
> +++ b/libavfilter/vf_detelecine.c
> @@ -0,0 +1,346 @@
> +/*
> + * Copyright (c) 2015 Himangi Saraogi <himangi...@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;
> + AVRational 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_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) +
> + av_rescale(outlink->frame_count, s->ts_unit.num,
> + s->ts_unit.den);
> + 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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