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FFmpeg/libavfilter/vf_pullup.c
Nicolas George 44f660e7e7 lavfi: remove FF_LINK_FLAG_REQUEST_LOOP. 
It has no longer any effect.
2015-09-20 19:02:33 +02:00

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/*
* Copyright (c) 2003 Rich Felker
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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/avassert.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"
#include "vf_pullup.h"
#define F_HAVE_BREAKS 1
#define F_HAVE_AFFINITY 2
#define BREAK_LEFT 1
#define BREAK_RIGHT 2
#define OFFSET(x) offsetof(PullupContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption pullup_options[] = {
{ "jl", "set left junk size", OFFSET(junk_left), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
{ "jr", "set right junk size", OFFSET(junk_right), AV_OPT_TYPE_INT, {.i64=1}, 0, INT_MAX, FLAGS },
{ "jt", "set top junk size", OFFSET(junk_top), AV_OPT_TYPE_INT, {.i64=4}, 1, INT_MAX, FLAGS },
{ "jb", "set bottom junk size", OFFSET(junk_bottom), AV_OPT_TYPE_INT, {.i64=4}, 1, INT_MAX, FLAGS },
{ "sb", "set strict breaks", OFFSET(strict_breaks), AV_OPT_TYPE_INT, {.i64=0},-1, 1, FLAGS },
{ "mp", "set metric plane", OFFSET(metric_plane), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, FLAGS, "mp" },
{ "y", "luma", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mp" },
{ "u", "chroma blue", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mp" },
{ "v", "chroma red", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "mp" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(pullup);
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
#define ABS(a) (((a) ^ ((a) >> 31)) - ((a) >> 31))
static int diff_c(const uint8_t *a, const uint8_t *b, ptrdiff_t s)
{
int i, j, diff = 0;
for (i = 0; i < 4; i++) {
for (j = 0; j < 8; j++)
diff += ABS(a[j] - b[j]);
a += s;
b += s;
}
return diff;
}
static int comb_c(const uint8_t *a, const uint8_t *b, ptrdiff_t s)
{
int i, j, comb = 0;
for (i = 0; i < 4; i++) {
for (j = 0; j < 8; j++)
comb += ABS((a[j] << 1) - b[j - s] - b[j ]) +
ABS((b[j] << 1) - a[j ] - a[j + s]);
a += s;
b += s;
}
return comb;
}
static int var_c(const uint8_t *a, const uint8_t *b, ptrdiff_t s)
{
int i, j, var = 0;
for (i = 0; i < 3; i++) {
for (j = 0; j < 8; j++)
var += ABS(a[j] - a[j + s]);
a += s;
}
return 4 * var; /* match comb scaling */
}
static int alloc_metrics(PullupContext *s, PullupField *f)
{
f->diffs = av_calloc(FFALIGN(s->metric_length, 16), sizeof(*f->diffs));
f->combs = av_calloc(FFALIGN(s->metric_length, 16), sizeof(*f->combs));
f->vars = av_calloc(FFALIGN(s->metric_length, 16), sizeof(*f->vars));
if (!f->diffs || !f->combs || !f->vars) {
av_freep(&f->diffs);
av_freep(&f->combs);
av_freep(&f->vars);
return AVERROR(ENOMEM);
}
return 0;
}
static void free_field_queue(PullupField *head)
{
PullupField *f = head;
do {
PullupField *next;
if (!f)
break;
av_free(f->diffs);
av_free(f->combs);
av_free(f->vars);
next = f->next;
memset(f, 0, sizeof(*f)); // clear all pointers to avoid stale ones
av_free(f);
f = next;
} while (f != head);
}
static PullupField *make_field_queue(PullupContext *s, int len)
{
PullupField *head, *f;
f = head = av_mallocz(sizeof(*head));
if (!f)
return NULL;
if (alloc_metrics(s, f) < 0) {
av_free(f);
return NULL;
}
for (; len > 0; len--) {
f->next = av_mallocz(sizeof(*f->next));
if (!f->next) {
free_field_queue(head);
return NULL;
}
f->next->prev = f;
f = f->next;
if (alloc_metrics(s, f) < 0) {
free_field_queue(head);
return NULL;
}
}
f->next = head;
head->prev = f;
return head;
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
PullupContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int mp = s->metric_plane;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
if (mp + 1 > s->nb_planes) {
av_log(ctx, AV_LOG_ERROR, "input format does not have such plane\n");
return AVERROR(EINVAL);
}
s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
s->metric_w = (s->planewidth[mp] - ((s->junk_left + s->junk_right) << 3)) >> 3;
s->metric_h = (s->planeheight[mp] - ((s->junk_top + s->junk_bottom) << 1)) >> 3;
s->metric_offset = (s->junk_left << 3) + (s->junk_top << 1) * s->planewidth[mp];
s->metric_length = s->metric_w * s->metric_h;
av_log(ctx, AV_LOG_DEBUG, "w: %d h: %d\n", s->metric_w, s->metric_h);
av_log(ctx, AV_LOG_DEBUG, "offset: %d length: %d\n", s->metric_offset, s->metric_length);
s->head = make_field_queue(s, 8);
if (!s->head)
return AVERROR(ENOMEM);
s->diff = diff_c;
s->comb = comb_c;
s->var = var_c;
if (ARCH_X86)
ff_pullup_init_x86(s);
return 0;
}
static PullupBuffer *pullup_lock_buffer(PullupBuffer *b, int parity)
{
if (!b)
return NULL;
if ((parity + 1) & 1)
b->lock[0]++;
if ((parity + 1) & 2)
b->lock[1]++;
return b;
}
static void pullup_release_buffer(PullupBuffer *b, int parity)
{
if (!b)
return;
if ((parity + 1) & 1)
b->lock[0]--;
if ((parity + 1) & 2)
b->lock[1]--;
}
static int alloc_buffer(PullupContext *s, PullupBuffer *b)
{
int i;
if (b->planes[0])
return 0;
for (i = 0; i < s->nb_planes; i++) {
b->planes[i] = av_malloc(s->planeheight[i] * s->planewidth[i]);
}
if (s->nb_planes == 1)
b->planes[1] = av_malloc(4*256);
return 0;
}
static PullupBuffer *pullup_get_buffer(PullupContext *s, int parity)
{
int i;
/* Try first to get the sister buffer for the previous field */
if (parity < 2 && s->last && parity != s->last->parity
&& !s->last->buffer->lock[parity]) {
alloc_buffer(s, s->last->buffer);
return pullup_lock_buffer(s->last->buffer, parity);
}
/* Prefer a buffer with both fields open */
for (i = 0; i < FF_ARRAY_ELEMS(s->buffers); i++) {
if (s->buffers[i].lock[0])
continue;
if (s->buffers[i].lock[1])
continue;
alloc_buffer(s, &s->buffers[i]);
return pullup_lock_buffer(&s->buffers[i], parity);
}
if (parity == 2)
return 0;
/* Search for any half-free buffer */
for (i = 0; i < FF_ARRAY_ELEMS(s->buffers); i++) {
if (((parity + 1) & 1) && s->buffers[i].lock[0])
continue;
if (((parity + 1) & 2) && s->buffers[i].lock[1])
continue;
alloc_buffer(s, &s->buffers[i]);
return pullup_lock_buffer(&s->buffers[i], parity);
}
return NULL;
}
static int queue_length(PullupField *begin, PullupField *end)
{
PullupField *f;
int count = 1;
if (!begin || !end)
return 0;
for (f = begin; f != end; f = f->next)
count++;
return count;
}
static int find_first_break(PullupField *f, int max)
{
int i;
for (i = 0; i < max; i++) {
if (f->breaks & BREAK_RIGHT || f->next->breaks & BREAK_LEFT)
return i + 1;
f = f->next;
}
return 0;
}
static void compute_breaks(PullupContext *s, PullupField *f0)
{
PullupField *f1 = f0->next;
PullupField *f2 = f1->next;
PullupField *f3 = f2->next;
int i, l, max_l = 0, max_r = 0;
if (f0->flags & F_HAVE_BREAKS)
return;
f0->flags |= F_HAVE_BREAKS;
/* Special case when fields are 100% identical */
if (f0->buffer == f2->buffer && f1->buffer != f3->buffer) {
f2->breaks |= BREAK_RIGHT;
return;
}
if (f0->buffer != f2->buffer && f1->buffer == f3->buffer) {
f1->breaks |= BREAK_LEFT;
return;
}
for (i = 0; i < s->metric_length; i++) {
l = f2->diffs[i] - f3->diffs[i];
if ( l > max_l)
max_l = l;
if (-l > max_r)
max_r = -l;
}
/* Don't get tripped up when differences are mostly quant error */
if (max_l + max_r < 128)
return;
if (max_l > 4 * max_r)
f1->breaks |= BREAK_LEFT;
if (max_r > 4 * max_l)
f2->breaks |= BREAK_RIGHT;
}
static void compute_affinity(PullupContext *s, PullupField *f)
{
int i, max_l = 0, max_r = 0, l;
if (f->flags & F_HAVE_AFFINITY)
return;
f->flags |= F_HAVE_AFFINITY;
if (f->buffer == f->next->next->buffer) {
f->affinity = 1;
f->next->affinity = 0;
f->next->next->affinity = -1;
f->next->flags |= F_HAVE_AFFINITY;
f->next->next->flags |= F_HAVE_AFFINITY;
return;
}
for (i = 0; i < s->metric_length; i++) {
int v = f->vars[i];
int lv = f->prev->vars[i];
int rv = f->next->vars[i];
int lc = f-> combs[i] - 2*(v < lv ? v : lv);
int rc = f->next->combs[i] - 2*(v < rv ? v : rv);
lc = FFMAX(lc, 0);
rc = FFMAX(rc, 0);
l = lc - rc;
if ( l > max_l)
max_l = l;
if (-l > max_r)
max_r = -l;
}
if (max_l + max_r < 64)
return;
if (max_r > 6 * max_l)
f->affinity = -1;
else if (max_l > 6 * max_r)
f->affinity = 1;
}
static int decide_frame_length(PullupContext *s)
{
PullupField *f0 = s->first;
PullupField *f1 = f0->next;
PullupField *f2 = f1->next;
PullupField *f;
int i, l, n;
if (queue_length(s->first, s->last) < 4)
return 0;
f = s->first;
n = queue_length(f, s->last);
for (i = 0; i < n - 1; i++) {
if (i < n - 3)
compute_breaks(s, f);
compute_affinity(s, f);
f = f->next;
}
if (f0->affinity == -1)
return 1;
l = find_first_break(f0, 3);
if (l == 1 && s->strict_breaks < 0)
l = 0;
switch (l) {
case 1:
return 1 + (s->strict_breaks < 1 && f0->affinity == 1 && f1->affinity == -1);
case 2:
/* FIXME: strictly speaking, f0->prev is no longer valid... :) */
if (s->strict_pairs
&& (f0->prev->breaks & BREAK_RIGHT) && (f2->breaks & BREAK_LEFT)
&& (f0->affinity != 1 || f1->affinity != -1) )
return 1;
return 1 + (f1->affinity != 1);
case 3:
return 2 + (f2->affinity != 1);
default:
/* 9 possibilities covered before switch */
if (f1->affinity == 1)
return 1; /* covers 6 */
else if (f1->affinity == -1)
return 2; /* covers 6 */
else if (f2->affinity == -1) { /* covers 2 */
return (f0->affinity == 1) ? 3 : 1;
} else {
return 2; /* the remaining 6 */
}
}
}
static PullupFrame *pullup_get_frame(PullupContext *s)
{
PullupFrame *fr = &s->frame;
int i, n = decide_frame_length(s);
int aff = s->first->next->affinity;
av_assert1(n < FF_ARRAY_ELEMS(fr->ifields));
if (!n || fr->lock)
return NULL;
fr->lock++;
fr->length = n;
fr->parity = s->first->parity;
fr->buffer = 0;
for (i = 0; i < n; i++) {
/* We cheat and steal the buffer without release+relock */
fr->ifields[i] = s->first->buffer;
s->first->buffer = 0;
s->first = s->first->next;
}
if (n == 1) {
fr->ofields[fr->parity ] = fr->ifields[0];
fr->ofields[fr->parity ^ 1] = 0;
} else if (n == 2) {
fr->ofields[fr->parity ] = fr->ifields[0];
fr->ofields[fr->parity ^ 1] = fr->ifields[1];
} else if (n == 3) {
if (!aff)
aff = (fr->ifields[0] == fr->ifields[1]) ? -1 : 1;
fr->ofields[fr->parity ] = fr->ifields[1 + aff];
fr->ofields[fr->parity ^ 1] = fr->ifields[1 ];
}
pullup_lock_buffer(fr->ofields[0], 0);
pullup_lock_buffer(fr->ofields[1], 1);
if (fr->ofields[0] == fr->ofields[1]) {
fr->buffer = fr->ofields[0];
pullup_lock_buffer(fr->buffer, 2);
return fr;
}
return fr;
}
static void pullup_release_frame(PullupFrame *f)
{
int i;
for (i = 0; i < f->length; i++)
pullup_release_buffer(f->ifields[i], f->parity ^ (i & 1));
pullup_release_buffer(f->ofields[0], 0);
pullup_release_buffer(f->ofields[1], 1);
if (f->buffer)
pullup_release_buffer(f->buffer, 2);
f->lock--;
}
static void compute_metric(PullupContext *s, int *dest,
PullupField *fa, int pa, PullupField *fb, int pb,
int (*func)(const uint8_t *, const uint8_t *, ptrdiff_t))
{
int mp = s->metric_plane;
int xstep = 8;
int ystep = s->planewidth[mp] << 3;
int stride = s->planewidth[mp] << 1; /* field stride */
int w = s->metric_w * xstep;
uint8_t *a, *b;
int x, y;
if (!fa->buffer || !fb->buffer)
return;
/* Shortcut for duplicate fields (e.g. from RFF flag) */
if (fa->buffer == fb->buffer && pa == pb) {
memset(dest, 0, s->metric_length * sizeof(*dest));
return;
}
a = fa->buffer->planes[mp] + pa * s->planewidth[mp] + s->metric_offset;
b = fb->buffer->planes[mp] + pb * s->planewidth[mp] + s->metric_offset;
for (y = 0; y < s->metric_h; y++) {
for (x = 0; x < w; x += xstep)
*dest++ = func(a + x, b + x, stride);
a += ystep; b += ystep;
}
}
static int check_field_queue(PullupContext *s)
{
int ret;
if (s->head->next == s->first) {
PullupField *f = av_mallocz(sizeof(*f));
if (!f)
return AVERROR(ENOMEM);
if ((ret = alloc_metrics(s, f)) < 0) {
av_free(f);
return ret;
}
f->prev = s->head;
f->next = s->first;
s->head->next = f;
s->first->prev = f;
}
return 0;
}
static void pullup_submit_field(PullupContext *s, PullupBuffer *b, int parity)
{
PullupField *f;
/* Grow the circular list if needed */
if (check_field_queue(s) < 0)
return;
/* Cannot have two fields of same parity in a row; drop the new one */
if (s->last && s->last->parity == parity)
return;
f = s->head;
f->parity = parity;
f->buffer = pullup_lock_buffer(b, parity);
f->flags = 0;
f->breaks = 0;
f->affinity = 0;
compute_metric(s, f->diffs, f, parity, f->prev->prev, parity, s->diff);
compute_metric(s, f->combs, parity ? f->prev : f, 0, parity ? f : f->prev, 1, s->comb);
compute_metric(s, f->vars, f, parity, f, -1, s->var);
emms_c();
/* Advance the circular list */
if (!s->first)
s->first = s->head;
s->last = s->head;
s->head = s->head->next;
}
static void copy_field(PullupContext *s,
PullupBuffer *dst, PullupBuffer *src, int parity)
{
uint8_t *dd, *ss;
int i;
for (i = 0; i < s->nb_planes; i++) {
ss = src->planes[i] + parity * s->planewidth[i];
dd = dst->planes[i] + parity * s->planewidth[i];
av_image_copy_plane(dd, s->planewidth[i] << 1,
ss, s->planewidth[i] << 1,
s->planewidth[i], s->planeheight[i] >> 1);
}
}
static void pullup_pack_frame(PullupContext *s, PullupFrame *fr)
{
int i;
if (fr->buffer)
return;
if (fr->length < 2)
return; /* FIXME: deal with this */
for (i = 0; i < 2; i++) {
if (fr->ofields[i]->lock[i^1])
continue;
fr->buffer = fr->ofields[i];
pullup_lock_buffer(fr->buffer, 2);
copy_field(s, fr->buffer, fr->ofields[i^1], i^1);
return;
}
fr->buffer = pullup_get_buffer(s, 2);
copy_field(s, fr->buffer, fr->ofields[0], 0);
copy_field(s, fr->buffer, fr->ofields[1], 1);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
PullupContext *s = ctx->priv;
PullupBuffer *b;
PullupFrame *f;
AVFrame *out;
int p, ret = 0;
b = pullup_get_buffer(s, 2);
if (!b) {
av_log(ctx, AV_LOG_WARNING, "Could not get buffer!\n");
f = pullup_get_frame(s);
pullup_release_frame(f);
goto end;
}
av_image_copy(b->planes, s->planewidth,
(const uint8_t**)in->data, in->linesize,
inlink->format, inlink->w, inlink->h);
p = in->interlaced_frame ? !in->top_field_first : 0;
pullup_submit_field(s, b, p );
pullup_submit_field(s, b, p^1);
if (in->repeat_pict)
pullup_submit_field(s, b, p);
pullup_release_buffer(b, 2);
f = pullup_get_frame(s);
if (!f)
goto end;
if (f->length < 2) {
pullup_release_frame(f);
f = pullup_get_frame(s);
if (!f)
goto end;
if (f->length < 2) {
pullup_release_frame(f);
if (!in->repeat_pict)
goto end;
f = pullup_get_frame(s);
if (!f)
goto end;
if (f->length < 2) {
pullup_release_frame(f);
goto end;
}
}
}
/* If the frame isn't already exportable... */
if (!f->buffer)
pullup_pack_frame(s, f);
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
ret = AVERROR(ENOMEM);
goto end;
}
av_frame_copy_props(out, in);
av_image_copy(out->data, out->linesize,
(const uint8_t**)f->buffer->planes, s->planewidth,
inlink->format, inlink->w, inlink->h);
ret = ff_filter_frame(outlink, out);
pullup_release_frame(f);
end:
av_frame_free(&in);
return ret;
}
static av_cold void uninit(AVFilterContext *ctx)
{
PullupContext *s = ctx->priv;
int i;
free_field_queue(s->head);
s->last = NULL;
for (i = 0; i < FF_ARRAY_ELEMS(s->buffers); i++) {
av_freep(&s->buffers[i].planes[0]);
av_freep(&s->buffers[i].planes[1]);
av_freep(&s->buffers[i].planes[2]);
}
}
static const AVFilterPad pullup_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad pullup_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
AVFilter ff_vf_pullup = {
.name = "pullup",
.description = NULL_IF_CONFIG_SMALL("Pullup from field sequence to frames."),
.priv_size = sizeof(PullupContext),
.priv_class = &pullup_class,
.uninit = uninit,
.query_formats = query_formats,
.inputs = pullup_inputs,
.outputs = pullup_outputs,
};
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