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avfilter/vf_decimate: add mixed option to process input only partially to be decimated

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Enabling the option will only decimate frames below dupthresh and output at
variable frame rate.
pull/388/head
mail@nodoa.me 2 years ago committed by Paul B Mahol
parent 48d5aecfc4
commit 38b837e0e1
2 changed files with 37 additions and 10 deletions
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  1. 5
      doc/filters.texi
  2. 42
      libavfilter/vf_decimate.c

5
doc/filters.texi
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@ -10922,6 +10922,11 @@ stream is the clean source from where the kept frames are chosen. Default is
@item chroma
Set whether or not chroma is considered in the metric calculations. Default is
@code{1}.
@item mixed
Set whether or not the input only partially contains content to be decimated.
Default is @code{false}.
If enabled video output stream will be in variable frame rate.
@end table
@section deconvolve

42
libavfilter/vf_decimate.c
Unescape View File

@ -44,6 +44,7 @@ typedef struct DecimateContext {
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
@ -51,6 +52,9 @@ typedef struct DecimateContext {
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;
@ -61,6 +65,7 @@ typedef struct DecimateContext {
int blockx, blocky;
int ppsrc;
int chroma;
int mixed;
} DecimateContext;
#define OFFSET(x) offsetof(DecimateContext, x)
@ -74,6 +79,7 @@ static const AVOption decimate_options[] = {
{ "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 }
};
@ -193,7 +199,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
}
if (dm->queue[lowest].maxbdiff < dm->dupthresh)
duppos = lowest;
drop = scpos >= 0 && duppos < 0 ? scpos : 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 */
@ -212,7 +223,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
/* push all frames except the drop */
ret = 0;
for (i = 0; i < dm->cycle && dm->queue[i].frame; i++) {
AVRational in_tb = ctx->inputs[INPUT_MAIN]->time_base;
if (i == drop) {
if (dm->ppsrc)
av_frame_free(&dm->clean_src[i]);
@ -221,7 +231,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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, in_tb, outlink->time_base);
dm->start_pts = av_rescale_q(frame->pts, dm->in_tb, outlink->time_base);
if (dm->ppsrc) {
av_frame_free(&frame);
@ -230,9 +240,11 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
continue;
dm->clean_src[i] = NULL;
}
frame->pts = outlink->frame_count_in +
frame->pts = dm->last_duration ? dm->last_pts + dm->last_duration :
(dm->start_pts == AV_NOPTS_VALUE ? 0 : dm->start_pts);
frame->duration = 1;
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)
@ -329,6 +341,7 @@ static av_cold int decimate_init(AVFilterContext *ctx)
}
dm->start_pts = AV_NOPTS_VALUE;
dm->last_duration = 0;
return 0;
}
@ -388,6 +401,9 @@ static int config_output(AVFilterLink *outlink)
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);
@ -403,11 +419,17 @@ static int config_output(AVFilterLink *outlink)
"current rate of %d/%d is invalid\n", fps.num, fps.den);
return AVERROR(EINVAL);
}
fps = av_mul_q(fps, (AVRational){dm->cycle - 1, dm->cycle});
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->time_base = av_inv_q(fps);
outlink->frame_rate = fps;
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;

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