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FFmpeg/libavfilter/vf_decimate.c

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/*
* Copyright (c) 2012 Fredrik Mellbin
* Copyright (c) 2013 Clément Bœsch
*
* 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
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#define INPUT_MAIN 0
#define INPUT_CLEANSRC 1
struct qitem {
AVFrame *frame;
int64_t maxbdiff;
int64_t totdiff;
};
typedef struct DecimateContext {
const AVClass *class;
struct qitem *queue; ///< window of cycle frames and the associated data diff
int fid; ///< current frame id in the queue
int filled; ///< 1 if the queue is filled, 0 otherwise
AVFrame *last; ///< last frame from the previous queue
AVFrame **clean_src; ///< frame queue for the clean source
int got_frame[2]; ///< frame request flag for each input stream
int64_t last_pts; ///< last output timestamp
int64_t last_duration; ///< last output duration
int64_t start_pts; ///< base for output timestamps
uint32_t eof; ///< bitmask for end of stream
int hsub, vsub; ///< chroma subsampling values
int depth;
int nxblocks, nyblocks;
int bdiffsize;
int64_t *bdiffs;
AVRational in_tb; // input time-base
AVRational nondec_tb; // non-decimated time-base
AVRational dec_tb; // decimated time-base
/* options */
int cycle;
double dupthresh_flt;
double scthresh_flt;
int64_t dupthresh;
int64_t scthresh;
int blockx, blocky;
int ppsrc;
int chroma;
int mixed;
} DecimateContext;
#define OFFSET(x) offsetof(DecimateContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption decimate_options[] = {
{ "cycle", "set the number of frame from which one will be dropped", OFFSET(cycle), AV_OPT_TYPE_INT, {.i64 = 5}, 2, 25, FLAGS },
{ "dupthresh", "set duplicate threshold", OFFSET(dupthresh_flt), AV_OPT_TYPE_DOUBLE, {.dbl = 1.1}, 0, 100, FLAGS },
{ "scthresh", "set scene change threshold", OFFSET(scthresh_flt), AV_OPT_TYPE_DOUBLE, {.dbl = 15.0}, 0, 100, FLAGS },
{ "blockx", "set the size of the x-axis blocks used during metric calculations", OFFSET(blockx), AV_OPT_TYPE_INT, {.i64 = 32}, 4, 1<<9, FLAGS },
{ "blocky", "set the size of the y-axis blocks used during metric calculations", OFFSET(blocky), AV_OPT_TYPE_INT, {.i64 = 32}, 4, 1<<9, FLAGS },
{ "ppsrc", "mark main input as a pre-processed input and activate clean source input stream", OFFSET(ppsrc), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ "chroma", "set whether or not chroma is considered in the metric calculations", OFFSET(chroma), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ "mixed", "set whether or not the input only partially contains content to be decimated", OFFSET(mixed), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(decimate);
static void calc_diffs(const DecimateContext *dm, struct qitem *q,
const AVFrame *f1, const AVFrame *f2)
{
int64_t maxdiff = -1;
int64_t *bdiffs = dm->bdiffs;
int plane, i, j;
memset(bdiffs, 0, dm->bdiffsize * sizeof(*bdiffs));
for (plane = 0; plane < (dm->chroma && f1->data[2] ? 3 : 1); plane++) {
int x, y, xl;
const int linesize1 = f1->linesize[plane];
const int linesize2 = f2->linesize[plane];
const uint8_t *f1p = f1->data[plane];
const uint8_t *f2p = f2->data[plane];
int width = plane ? AV_CEIL_RSHIFT(f1->width, dm->hsub) : f1->width;
int height = plane ? AV_CEIL_RSHIFT(f1->height, dm->vsub) : f1->height;
int hblockx = dm->blockx / 2;
int hblocky = dm->blocky / 2;
if (plane) {
hblockx >>= dm->hsub;
hblocky >>= dm->vsub;
}
for (y = 0; y < height; y++) {
int ydest = y / hblocky;
int xdest = 0;
#define CALC_DIFF(nbits) do { \
for (x = 0; x < width; x += hblockx) { \
int64_t acc = 0; \
int m = FFMIN(width, x + hblockx); \
for (xl = x; xl < m; xl++) \
acc += abs(((const uint##nbits##_t *)f1p)[xl] - \
((const uint##nbits##_t *)f2p)[xl]); \
bdiffs[ydest * dm->nxblocks + xdest] += acc; \
xdest++; \
} \
} while (0)
if (dm->depth == 8) CALC_DIFF(8);
else CALC_DIFF(16);
f1p += linesize1;
f2p += linesize2;
}
}
for (i = 0; i < dm->nyblocks - 1; i++) {
for (j = 0; j < dm->nxblocks - 1; j++) {
int64_t tmp = bdiffs[ i * dm->nxblocks + j ]
+ bdiffs[ i * dm->nxblocks + j + 1]
+ bdiffs[(i + 1) * dm->nxblocks + j ]
+ bdiffs[(i + 1) * dm->nxblocks + j + 1];
if (tmp > maxdiff)
maxdiff = tmp;
}
}
q->totdiff = 0;
for (i = 0; i < dm->bdiffsize; i++)
q->totdiff += bdiffs[i];
q->maxbdiff = maxdiff;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
int scpos = -1, duppos = -1;
int drop = INT_MIN, i, lowest = 0, ret;
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DecimateContext *dm = ctx->priv;
AVFrame *prv;
/* update frames queue(s) */
if (FF_INLINK_IDX(inlink) == INPUT_MAIN) {
dm->queue[dm->fid].frame = in;
dm->got_frame[INPUT_MAIN] = 1;
} else {
dm->clean_src[dm->fid] = in;
dm->got_frame[INPUT_CLEANSRC] = 1;
}
if (!dm->got_frame[INPUT_MAIN] || (dm->ppsrc && !dm->got_frame[INPUT_CLEANSRC]))
return 0;
dm->got_frame[INPUT_MAIN] = dm->got_frame[INPUT_CLEANSRC] = 0;
if (dm->ppsrc)
in = dm->queue[dm->fid].frame;
if (in) {
/* update frame metrics */
prv = dm->fid ? dm->queue[dm->fid - 1].frame : dm->last;
if (!prv) {
dm->queue[dm->fid].maxbdiff = INT64_MAX;
dm->queue[dm->fid].totdiff = INT64_MAX;
} else {
calc_diffs(dm, &dm->queue[dm->fid], prv, in);
}
if (++dm->fid != dm->cycle)
return 0;
av_frame_free(&dm->last);
dm->last = av_frame_clone(in);
dm->fid = 0;
/* we have a complete cycle, select the frame to drop */
lowest = 0;
for (i = 0; i < dm->cycle; i++) {
if (dm->queue[i].totdiff > dm->scthresh)
scpos = i;
if (dm->queue[i].maxbdiff < dm->queue[lowest].maxbdiff)
lowest = i;
}
if (dm->queue[lowest].maxbdiff < dm->dupthresh)
duppos = lowest;
if (dm->mixed && duppos < 0) {
drop = -1; // no drop if mixed content + no frame in cycle below threshold
} else {
drop = scpos >= 0 && duppos < 0 ? scpos : lowest;
}
}
/* metrics debug */
if (av_log_get_level() >= AV_LOG_DEBUG) {
av_log(ctx, AV_LOG_DEBUG, "1/%d frame drop:\n", dm->cycle);
for (i = 0; i < dm->cycle && dm->queue[i].frame; i++) {
av_log(ctx, AV_LOG_DEBUG," #%d: totdiff=%08"PRIx64" maxbdiff=%08"PRIx64"%s%s%s%s\n",
i + 1, dm->queue[i].totdiff, dm->queue[i].maxbdiff,
i == scpos ? " sc" : "",
i == duppos ? " dup" : "",
i == lowest ? " lowest" : "",
i == drop ? " [DROP]" : "");
}
}
/* push all frames except the drop */
ret = 0;
for (i = 0; i < dm->cycle && dm->queue[i].frame; i++) {
if (i == drop) {
if (dm->ppsrc)
av_frame_free(&dm->clean_src[i]);
av_frame_free(&dm->queue[i].frame);
} else {
AVFrame *frame = dm->queue[i].frame;
dm->queue[i].frame = NULL;
if (frame->pts != AV_NOPTS_VALUE && dm->start_pts == AV_NOPTS_VALUE)
dm->start_pts = av_rescale_q(frame->pts, dm->in_tb, outlink->time_base);
if (dm->ppsrc) {
av_frame_free(&frame);
frame = dm->clean_src[i];
if (!frame)
continue;
dm->clean_src[i] = NULL;
}
frame->pts = dm->last_duration ? dm->last_pts + dm->last_duration :
(dm->start_pts == AV_NOPTS_VALUE ? 0 : dm->start_pts);
frame->duration = dm->mixed ? av_div_q(drop < 0 ? dm->nondec_tb : dm->dec_tb, outlink->time_base).num : 1;
dm->last_duration = frame->duration;
dm->last_pts = frame->pts;
ret = ff_filter_frame(outlink, frame);
if (ret < 0)
break;
}
}
return ret;
}
static int activate(AVFilterContext *ctx)
{
DecimateContext *dm = ctx->priv;
AVFrame *frame = NULL;
int ret = 0, status;
int64_t pts;
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
if ((dm->got_frame[INPUT_MAIN] == 0) && !(dm->eof & (1 << INPUT_MAIN)) &&
(ret = ff_inlink_consume_frame(ctx->inputs[INPUT_MAIN], &frame)) > 0) {
ret = filter_frame(ctx->inputs[INPUT_MAIN], frame);
if (ret < 0)
return ret;
}
if (ret < 0)
return ret;
if (dm->ppsrc &&
(dm->got_frame[INPUT_CLEANSRC] == 0) && !(dm->eof & (1 << INPUT_CLEANSRC)) &&
(ret = ff_inlink_consume_frame(ctx->inputs[INPUT_CLEANSRC], &frame)) > 0) {
ret = filter_frame(ctx->inputs[INPUT_CLEANSRC], frame);
if (ret < 0)
return ret;
}
if (ret < 0) {
return ret;
} else if (dm->eof == ((1 << INPUT_MAIN) | (dm->ppsrc << INPUT_CLEANSRC))) {
ff_outlink_set_status(ctx->outputs[0], AVERROR_EOF, dm->last_pts);
return 0;
} else if (!(dm->eof & (1 << INPUT_MAIN)) && ff_inlink_acknowledge_status(ctx->inputs[INPUT_MAIN], &status, &pts)) {
if (status == AVERROR_EOF) { // flushing
dm->eof |= 1 << INPUT_MAIN;
if (dm->ppsrc)
filter_frame(ctx->inputs[INPUT_CLEANSRC], NULL);
filter_frame(ctx->inputs[INPUT_MAIN], NULL);
ff_outlink_set_status(ctx->outputs[0], AVERROR_EOF, dm->last_pts);
return 0;
}
} else if (dm->ppsrc && !(dm->eof & (1 << INPUT_CLEANSRC)) && ff_inlink_acknowledge_status(ctx->inputs[INPUT_CLEANSRC], &status, &pts)) {
if (status == AVERROR_EOF) { // flushing
dm->eof |= 1 << INPUT_CLEANSRC;
filter_frame(ctx->inputs[INPUT_MAIN], NULL);
filter_frame(ctx->inputs[INPUT_CLEANSRC], NULL);
ff_outlink_set_status(ctx->outputs[0], AVERROR_EOF, dm->last_pts);
return 0;
}
}
if (ff_inlink_queued_frames(ctx->inputs[INPUT_MAIN]) > 0 && (!dm->ppsrc ||
(dm->ppsrc && ff_inlink_queued_frames(ctx->inputs[INPUT_CLEANSRC]) > 0))) {
ff_filter_set_ready(ctx, 100);
} else if (ff_outlink_frame_wanted(ctx->outputs[0])) {
if (dm->got_frame[INPUT_MAIN] == 0)
ff_inlink_request_frame(ctx->inputs[INPUT_MAIN]);
if (dm->ppsrc && (dm->got_frame[INPUT_CLEANSRC] == 0))
ff_inlink_request_frame(ctx->inputs[INPUT_CLEANSRC]);
}
return 0;
}
static av_cold int decimate_init(AVFilterContext *ctx)
{
DecimateContext *dm = ctx->priv;
AVFilterPad pad = {
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
};
int ret;
if ((ret = ff_append_inpad(ctx, &pad)) < 0)
return ret;
if (dm->ppsrc) {
pad.name = "clean_src";
pad.config_props = NULL;
if ((ret = ff_append_inpad(ctx, &pad)) < 0)
return ret;
}
if ((dm->blockx & (dm->blockx - 1)) ||
(dm->blocky & (dm->blocky - 1))) {
av_log(ctx, AV_LOG_ERROR, "blockx and blocky settings must be power of two\n");
return AVERROR(EINVAL);
}
dm->start_pts = AV_NOPTS_VALUE;
dm->last_duration = 0;
return 0;
}
static av_cold void decimate_uninit(AVFilterContext *ctx)
{
int i;
DecimateContext *dm = ctx->priv;
av_frame_free(&dm->last);
av_freep(&dm->bdiffs);
if (dm->queue) {
for (i = 0; i < dm->cycle; i++)
av_frame_free(&dm->queue[i].frame);
}
av_freep(&dm->queue);
if (dm->clean_src) {
for (i = 0; i < dm->cycle; i++)
av_frame_free(&dm->clean_src[i]);
}
av_freep(&dm->clean_src);
}
static const enum AVPixelFormat pix_fmts[] = {
#define PF_NOALPHA(suf) AV_PIX_FMT_YUV420##suf, AV_PIX_FMT_YUV422##suf, AV_PIX_FMT_YUV444##suf
#define PF_ALPHA(suf) AV_PIX_FMT_YUVA420##suf, AV_PIX_FMT_YUVA422##suf, AV_PIX_FMT_YUVA444##suf
#define PF(suf) PF_NOALPHA(suf), PF_ALPHA(suf)
PF(P), PF(P9), PF(P10), PF_NOALPHA(P12), PF_NOALPHA(P14), PF(P16),
AV_PIX_FMT_YUV440P10, AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
DecimateContext *dm = ctx->priv;
const AVFilterLink *inlink = ctx->inputs[INPUT_MAIN];
AVRational fps = inlink->frame_rate;
int max_value;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
const int w = inlink->w;
const int h = inlink->h;
dm->hsub = pix_desc->log2_chroma_w;
dm->vsub = pix_desc->log2_chroma_h;
dm->depth = pix_desc->comp[0].depth;
max_value = (1 << dm->depth) - 1;
dm->scthresh = (int64_t)(((int64_t)max_value * w * h * dm->scthresh_flt) / 100);
dm->dupthresh = (int64_t)(((int64_t)max_value * dm->blockx * dm->blocky * dm->dupthresh_flt) / 100);
dm->nxblocks = (w + dm->blockx/2 - 1) / (dm->blockx/2);
dm->nyblocks = (h + dm->blocky/2 - 1) / (dm->blocky/2);
dm->bdiffsize = dm->nxblocks * dm->nyblocks;
dm->bdiffs = av_malloc_array(dm->bdiffsize, sizeof(*dm->bdiffs));
dm->queue = av_calloc(dm->cycle, sizeof(*dm->queue));
dm->in_tb = inlink->time_base;
dm->nondec_tb = av_inv_q(fps);
dm->dec_tb = av_mul_q(dm->nondec_tb, (AVRational){dm->cycle, dm->cycle - 1});
if (!dm->bdiffs || !dm->queue)
return AVERROR(ENOMEM);
if (dm->ppsrc) {
dm->clean_src = av_calloc(dm->cycle, sizeof(*dm->clean_src));
if (!dm->clean_src)
return AVERROR(ENOMEM);
}
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);
}
if (dm->mixed) {
outlink->time_base = av_gcd_q(dm->nondec_tb, dm->dec_tb, AV_TIME_BASE / 2, AV_TIME_BASE_Q);
av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> VFR (use %d/%d if CFR required)\n",
fps.num, fps.den, outlink->time_base.den, outlink->time_base.num);
} else {
outlink->time_base = dm->dec_tb;
outlink->frame_rate = av_inv_q(outlink->time_base);
av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
fps.num, fps.den, outlink->frame_rate.num, outlink->frame_rate.den);
}
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
if (dm->ppsrc) {
outlink->w = ctx->inputs[INPUT_CLEANSRC]->w;
outlink->h = ctx->inputs[INPUT_CLEANSRC]->h;
} else {
outlink->w = inlink->w;
outlink->h = inlink->h;
}
return 0;
}
static const AVFilterPad decimate_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_decimate = {
.name = "decimate",
.description = NULL_IF_CONFIG_SMALL("Decimate frames (post field matching filter)."),
.init = decimate_init,
.activate = activate,
.uninit = decimate_uninit,
.priv_size = sizeof(DecimateContext),
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FILTER_OUTPUTS(decimate_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &decimate_class,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};