mirror of
https://github.com/mpv-player/mpv
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271 lines
8.1 KiB
C
271 lines
8.1 KiB
C
/*
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* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
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*
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* This file is part of mpv's vf_dlopen examples.
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*
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* mpv's vf_dlopen examples are free software; you can redistribute them and/or
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* modify them under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of the
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* License, or (at your option) any later version.
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*
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* mpv's vf_dlopen examples are distributed in the hope that they will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv's vf_dlopen examples; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "vf_dlopen.h"
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#include "filterutils.h"
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#define MIN(a,b) ((a)<(b)?(a):(b))
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/*
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* telecine filter
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*
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* usage: -vf dlopen=./telecine.so:t:23
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*
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* Parameter: first parameter is "t" for top field first, "b" for bottom field first
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* then digits (0-9) for how many fields a frame is to be displayed
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*
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* Typical patterns (see http://en.wikipedia.org/wiki/Telecine):
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*
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* NTSC output (30i):
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* 27.5p: 32222
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* 24p: 23 (classic)
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* 24p: 2332 (preferred)
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* 20p: 33
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* 18p: 334
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* 16p: 3444
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*
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* PAL output (25i):
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* 27.5p: 12222
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* 24p: 222222222223 ("Euro pulldown")
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* 16.67p: 33
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* 16p: 33333334
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*/
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typedef struct {
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int firstfield;
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const char *pattern;
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unsigned int pattern_pos;
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unsigned char *buffer_plane[4];
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size_t buffer_size[4];
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int pts_num;
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int pts_denom;
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int occupied;
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double lastpts_in;
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double lastpts_out;
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int first_frame_of_group;
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} tc_data_t;
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static int tc_config(struct vf_dlopen_context *ctx)
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{
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// we may return more than one pic!
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tc_data_t *tc = ctx->priv;
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const char *p;
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int max = 0;
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tc->pts_num = 0;
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tc->pts_denom = 0;
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for (p = tc->pattern; *p; ++p) {
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if (*p - '0' > max)
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max = *p - '0';
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tc->pts_num += 2;
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tc->pts_denom += *p - '0';
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}
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ctx->out_cnt = (max + 1) / 2;
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printf(
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"Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
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tc->pattern, ctx->out_cnt, tc->pts_num, tc->pts_denom);
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return 1;
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}
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static int tc_put_image(struct vf_dlopen_context *ctx)
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{
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tc_data_t *tc = ctx->priv;
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unsigned p;
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unsigned np = ctx->outpic[0].planes;
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assert(ctx->inpic.planes == ctx->outpic[0].planes);
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int need_reinit = 0;
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// fix buffers
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for (p = 0; p < np; ++p) {
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size_t sz = ctx->inpic.planestride[p] * ctx->inpic.planeheight[p];
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if (sz != tc->buffer_size[p]) {
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if (p == 0 && tc->buffer_plane[p])
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printf("WARNING: reinitializing telecine buffers.\n");
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tc->buffer_plane[p] = realloc(tc->buffer_plane[p], sz);
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tc->buffer_size[p] = sz;
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need_reinit = 1;
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}
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}
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// too big pts change? reinit
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if (ctx->inpic.pts < tc->lastpts_in || ctx->inpic.pts > tc->lastpts_in + 0.5)
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need_reinit = 1;
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if (need_reinit) {
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// initialize telecine
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tc->pattern_pos = 0;
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tc->occupied = 0;
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tc->lastpts_in = ctx->inpic.pts;
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tc->lastpts_out = ctx->inpic.pts;
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}
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int len = tc->pattern[tc->pattern_pos] - '0';
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unsigned nout;
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double delta = ctx->inpic.pts - tc->lastpts_in;
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tc->lastpts_in = ctx->inpic.pts;
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for (nout = 0; nout < ctx->out_cnt; ++nout) {
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for (p = 0; p < np; ++p) {
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assert(ctx->inpic.planewidth[p] == ctx->outpic[nout].planewidth[p]);
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assert(ctx->inpic.planeheight[p] == ctx->outpic[nout].planeheight[p]);
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}
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}
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nout = 0;
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if (tc->pattern_pos == 0 && !tc->occupied) {
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// at the start of the pattern, reset pts
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// printf("pts reset: %f -> %f (delta: %f)\n", tc->lastpts_out, ctx->inpic.pts, ctx->inpic.pts - tc->lastpts_out);
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tc->lastpts_out = ctx->inpic.pts;
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tc->first_frame_of_group = 1;
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}
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++tc->pattern_pos;
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if (!tc->pattern[tc->pattern_pos])
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tc->pattern_pos = 0;
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if (len == 0) {
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// do not output any field from this frame
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return 0;
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}
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if (tc->occupied) {
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for (p = 0; p < np; ++p) {
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// fill in the EARLIER field from the buffered pic
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copy_plane(
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&ctx->outpic[nout].plane[p][ctx->outpic[nout].planestride[p] * tc->firstfield],
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ctx->outpic[nout].planestride[p] * 2,
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&tc->buffer_plane[p][ctx->inpic.planestride[p] * tc->firstfield],
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ctx->inpic.planestride[p] * 2,
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MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
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(ctx->inpic.planeheight[p] - tc->firstfield + 1) / 2
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);
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// fill in the LATER field from the new pic
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copy_plane(
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&ctx->outpic[nout].plane[p][ctx->outpic[nout].planestride[p] * !tc->firstfield],
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ctx->outpic[nout].planestride[p] * 2,
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&ctx->inpic.plane[p][ctx->inpic.planestride[p] * !tc->firstfield],
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ctx->inpic.planestride[p] * 2,
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MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
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(ctx->inpic.planeheight[p] - !tc->firstfield + 1) / 2
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);
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}
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if (tc->first_frame_of_group)
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tc->first_frame_of_group = 0;
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else
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tc->lastpts_out += (delta * tc->pts_num) / tc->pts_denom;
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ctx->outpic[nout].pts = tc->lastpts_out;
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// printf("pts written: %f\n", ctx->outpic[nout].pts);
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++nout;
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--len;
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tc->occupied = 0;
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}
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while (len >= 2) {
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// output THIS image as-is
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for (p = 0; p < np; ++p)
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copy_plane(
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ctx->outpic[nout].plane[p], ctx->outpic[nout].planestride[p],
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ctx->inpic.plane[p], ctx->inpic.planestride[p],
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MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
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ctx->inpic.planeheight[p]
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);
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if (tc->first_frame_of_group)
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tc->first_frame_of_group = 0;
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else
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tc->lastpts_out += (delta * tc->pts_num) / tc->pts_denom;
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ctx->outpic[nout].pts = tc->lastpts_out;
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// printf("pts written: %f\n", ctx->outpic[nout].pts);
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++nout;
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len -= 2;
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}
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if (len >= 1) {
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// copy THIS image to the buffer, we need it later
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for (p = 0; p < np; ++p)
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copy_plane(
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&tc->buffer_plane[p][0], ctx->inpic.planestride[p],
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&ctx->inpic.plane[p][0], ctx->inpic.planestride[p],
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ctx->inpic.planestride[p],
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ctx->inpic.planeheight[p]
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);
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tc->occupied = 1;
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}
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return nout;
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}
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void tc_uninit(struct vf_dlopen_context *ctx)
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{
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tc_data_t *tc = ctx->priv;
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free(tc->buffer_plane[3]);
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free(tc->buffer_plane[2]);
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free(tc->buffer_plane[1]);
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free(tc->buffer_plane[0]);
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free(tc);
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}
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int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
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{
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VF_DLOPEN_CHECK_VERSION(ctx);
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const char *a0 = (argc < 1) ? "t" : argv[0];
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const char *a1 = (argc < 2) ? "23" : argv[1];
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if (!a0[0] || a0[1] || !a1[0] || argc > 2)
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return -1;
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tc_data_t *tc = malloc(sizeof(tc_data_t));
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memset(tc, 0, sizeof(*tc));
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if (a0[0] == 't')
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tc->firstfield = 0;
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else if (a0[0] == 'b')
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tc->firstfield = 1;
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else {
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printf("telecine: invalid first field\n");
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free(tc);
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return -1;
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}
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tc->pattern = a1;
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const char *p;
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for (p = tc->pattern; *p; ++p)
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if (*p < '0' || *p > '9') {
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printf("telecine: invalid pattern\n");
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free(tc);
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return -1;
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}
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ctx->priv = tc;
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ctx->format_mapping = NULL; // anything goes
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ctx->config = tc_config;
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ctx->put_image = tc_put_image;
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ctx->uninit = tc_uninit;
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return 1;
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}
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