mpv/TOOLS/vf_dlopen/telecine.c

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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vf_dlopen.h"
#include "filterutils.h"
#define MIN(a,b) ((a)<(b)?(a):(b))
/*
* telecine filter
*
* usage: -vf dlopen=./telecine.so:t:23
*
* Parameter: first parameter is "t" for top field first, "b" for bottom field first
* then digits (0-9) for how many fields a frame is to be displayed
*
* Typical patterns (see http://en.wikipedia.org/wiki/Telecine):
*
* NTSC output (30i):
* 27.5p: 32222
* 24p: 23 (classic)
* 24p: 2332 (preferred)
* 20p: 33
* 18p: 334
* 16p: 3444
*
* PAL output (25i):
* 27.5p: 12222
* 24p: 222222222223 ("Euro pulldown")
* 16.67p: 33
* 16p: 33333334
*/
typedef struct {
int firstfield;
const char *pattern;
unsigned int pattern_pos;
unsigned char *buffer_plane[4];
size_t buffer_size[4];
int pts_num;
int pts_denom;
int occupied;
double lastpts_in;
double lastpts_out;
int first_frame_of_group;
} tc_data_t;
static int tc_config(struct vf_dlopen_context *ctx)
{
// we may return more than one pic!
tc_data_t *tc = ctx->priv;
const char *p;
int max = 0;
tc->pts_num = 0;
tc->pts_denom = 0;
for (p = tc->pattern; *p; ++p) {
if (*p - '0' > max)
max = *p - '0';
tc->pts_num += 2;
tc->pts_denom += *p - '0';
}
ctx->out_cnt = (max + 1) / 2;
printf(
"Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
tc->pattern, ctx->out_cnt, tc->pts_num, tc->pts_denom);
return 1;
}
static int tc_put_image(struct vf_dlopen_context *ctx)
{
tc_data_t *tc = ctx->priv;
unsigned p;
unsigned np = ctx->outpic[0].planes;
assert(ctx->inpic.planes == ctx->outpic[0].planes);
int need_reinit = 0;
// fix buffers
for (p = 0; p < np; ++p) {
size_t sz = ctx->inpic.planestride[p] * ctx->inpic.planeheight[p];
if (sz != tc->buffer_size[p]) {
if (p == 0 && tc->buffer_plane[p])
printf("WARNING: reinitializing telecine buffers.\n");
tc->buffer_plane[p] = realloc(tc->buffer_plane[p], sz);
tc->buffer_size[p] = sz;
need_reinit = 1;
}
}
// too big pts change? reinit
if (ctx->inpic.pts < tc->lastpts_in || ctx->inpic.pts > tc->lastpts_in + 0.5)
need_reinit = 1;
if (need_reinit) {
// initialize telecine
tc->pattern_pos = 0;
tc->occupied = 0;
tc->lastpts_in = ctx->inpic.pts;
tc->lastpts_out = ctx->inpic.pts;
}
int len = tc->pattern[tc->pattern_pos] - '0';
unsigned nout;
double delta = ctx->inpic.pts - tc->lastpts_in;
tc->lastpts_in = ctx->inpic.pts;
for (nout = 0; nout < ctx->out_cnt; ++nout) {
for (p = 0; p < np; ++p) {
assert(ctx->inpic.planewidth[p] == ctx->outpic[nout].planewidth[p]);
assert(ctx->inpic.planeheight[p] == ctx->outpic[nout].planeheight[p]);
}
}
nout = 0;
if (tc->pattern_pos == 0 && !tc->occupied) {
// at the start of the pattern, reset pts
// printf("pts reset: %f -> %f (delta: %f)\n", tc->lastpts_out, ctx->inpic.pts, ctx->inpic.pts - tc->lastpts_out);
tc->lastpts_out = ctx->inpic.pts;
tc->first_frame_of_group = 1;
}
++tc->pattern_pos;
if (!tc->pattern[tc->pattern_pos])
tc->pattern_pos = 0;
if (len == 0) {
// do not output any field from this frame
return 0;
}
if (tc->occupied) {
for (p = 0; p < np; ++p) {
// fill in the EARLIER field from the buffered pic
copy_plane(
&ctx->outpic[nout].plane[p][ctx->outpic[nout].planestride[p] * tc->firstfield],
ctx->outpic[nout].planestride[p] * 2,
&tc->buffer_plane[p][ctx->inpic.planestride[p] * tc->firstfield],
ctx->inpic.planestride[p] * 2,
MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
(ctx->inpic.planeheight[p] - tc->firstfield + 1) / 2
);
// fill in the LATER field from the new pic
copy_plane(
&ctx->outpic[nout].plane[p][ctx->outpic[nout].planestride[p] * !tc->firstfield],
ctx->outpic[nout].planestride[p] * 2,
&ctx->inpic.plane[p][ctx->inpic.planestride[p] * !tc->firstfield],
ctx->inpic.planestride[p] * 2,
MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
(ctx->inpic.planeheight[p] - !tc->firstfield + 1) / 2
);
}
if (tc->first_frame_of_group)
tc->first_frame_of_group = 0;
else
tc->lastpts_out += (delta * tc->pts_num) / tc->pts_denom;
ctx->outpic[nout].pts = tc->lastpts_out;
// printf("pts written: %f\n", ctx->outpic[nout].pts);
++nout;
--len;
tc->occupied = 0;
}
while (len >= 2) {
// output THIS image as-is
for (p = 0; p < np; ++p)
copy_plane(
ctx->outpic[nout].plane[p], ctx->outpic[nout].planestride[p],
ctx->inpic.plane[p], ctx->inpic.planestride[p],
MIN(ctx->inpic.planestride[p], ctx->outpic[nout].planestride[p]),
ctx->inpic.planeheight[p]
);
if (tc->first_frame_of_group)
tc->first_frame_of_group = 0;
else
tc->lastpts_out += (delta * tc->pts_num) / tc->pts_denom;
ctx->outpic[nout].pts = tc->lastpts_out;
// printf("pts written: %f\n", ctx->outpic[nout].pts);
++nout;
len -= 2;
}
if (len >= 1) {
// copy THIS image to the buffer, we need it later
for (p = 0; p < np; ++p)
copy_plane(
&tc->buffer_plane[p][0], ctx->inpic.planestride[p],
&ctx->inpic.plane[p][0], ctx->inpic.planestride[p],
ctx->inpic.planestride[p],
ctx->inpic.planeheight[p]
);
tc->occupied = 1;
}
return nout;
}
void tc_uninit(struct vf_dlopen_context *ctx)
{
tc_data_t *tc = ctx->priv;
free(tc->buffer_plane[3]);
free(tc->buffer_plane[2]);
free(tc->buffer_plane[1]);
free(tc->buffer_plane[0]);
free(tc);
}
int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
{
VF_DLOPEN_CHECK_VERSION(ctx);
const char *a0 = (argc < 1) ? "t" : argv[0];
const char *a1 = (argc < 2) ? "23" : argv[1];
if (!a0[0] || a0[1] || !a1[0] || argc > 2)
return -1;
tc_data_t *tc = malloc(sizeof(tc_data_t));
memset(tc, 0, sizeof(*tc));
if (a0[0] == 't')
tc->firstfield = 0;
else if (a0[0] == 'b')
tc->firstfield = 1;
else {
printf("telecine: invalid first field\n");
free(tc);
return -1;
}
tc->pattern = a1;
const char *p;
for (p = tc->pattern; *p; ++p)
if (*p < '0' || *p > '9') {
printf("telecine: invalid pattern\n");
free(tc);
return -1;
}
ctx->priv = tc;
ctx->format_mapping = NULL; // anything goes
ctx->config = tc_config;
ctx->put_image = tc_put_image;
ctx->uninit = tc_uninit;
return 1;
}