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/* |
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* Copyright 2007 Bobby Bingham
* Copyright 2012 Robert Nagy <ronag89 gmail com>
* Copyright 2012 Anton Khirnov <anton khirnov net>
* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* 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.
* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* a filter enforcing given constant framerate
*/
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#include <float.h> |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h" |
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#include "internal.h"
#include "video.h" |
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typedef struct FPSContext {
const AVClass *class;
AVFifoBuffer *fifo; ///< store frames until we get two successive timestamps
/* timestamps in input timebase */
int64_t first_pts; ///< pts of the first frame that arrived on this filter
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double start_time; ///< pts, in seconds, of the expected first frame
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AVRational framerate; ///< target framerate |
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int rounding; ///< AVRounding method for timestamps |
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/* statistics */
int frames_in; ///< number of frames on input
int frames_out; ///< number of frames on output
int dup; ///< number of frames duplicated
int drop; ///< number of framed dropped
} FPSContext;
#define OFFSET(x) offsetof(FPSContext, x)
#define V AV_OPT_FLAG_VIDEO_PARAM |
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#define F AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption fps_options[] = { |
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{ "fps", "A string describing desired output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, .flags = V|F }, |
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{ "start_time", "Assume the first PTS should be this value.", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX}, -DBL_MAX, DBL_MAX, V }, |
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{ "round", "set rounding method for timestamps", OFFSET(rounding), AV_OPT_TYPE_INT, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" },
{ "zero", "round towards 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_ZERO }, 0, 5, V|F, "round" },
{ "inf", "round away from 0", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_INF }, 0, 5, V|F, "round" },
{ "down", "round towards -infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_DOWN }, 0, 5, V|F, "round" },
{ "up", "round towards +infty", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_UP }, 0, 5, V|F, "round" },
{ "near", "round to nearest", OFFSET(rounding), AV_OPT_TYPE_CONST, { .i64 = AV_ROUND_NEAR_INF }, 0, 5, V|F, "round" }, |
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{ NULL } |
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};
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AVFILTER_DEFINE_CLASS(fps); |
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static av_cold int init(AVFilterContext *ctx) |
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{
FPSContext *s = ctx->priv;
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if (!(s->fifo = av_fifo_alloc(2*sizeof(AVFrame*)))) |
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return AVERROR(ENOMEM);
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s->first_pts = AV_NOPTS_VALUE; |
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av_log(ctx, AV_LOG_VERBOSE, "fps=%d/%d\n", s->framerate.num, s->framerate.den);
return 0;
}
static void flush_fifo(AVFifoBuffer *fifo)
{
while (av_fifo_size(fifo)) { |
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AVFrame *tmp; |
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av_fifo_generic_read(fifo, &tmp, sizeof(tmp), NULL); |
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av_frame_free(&tmp); |
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}
}
static av_cold void uninit(AVFilterContext *ctx)
{
FPSContext *s = ctx->priv;
if (s->fifo) { |
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s->drop += av_fifo_size(s->fifo) / sizeof(AVFrame*); |
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flush_fifo(s->fifo);
av_fifo_free(s->fifo);
}
av_log(ctx, AV_LOG_VERBOSE, "%d frames in, %d frames out; %d frames dropped, "
"%d frames duplicated.\n", s->frames_in, s->frames_out, s->drop, s->dup);
}
static int config_props(AVFilterLink* link)
{
FPSContext *s = link->src->priv;
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link->time_base = av_inv_q(s->framerate); |
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link->frame_rate= s->framerate; |
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link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
return 0;
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
FPSContext *s = ctx->priv;
int frames_out = s->frames_out;
int ret = 0;
while (ret >= 0 && s->frames_out == frames_out) |
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ret = ff_request_frame(ctx->inputs[0]); |
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/* flush the fifo */
if (ret == AVERROR_EOF && av_fifo_size(s->fifo)) {
int i;
for (i = 0; av_fifo_size(s->fifo); i++) { |
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AVFrame *buf; |
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av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
buf->pts = av_rescale_q(s->first_pts, ctx->inputs[0]->time_base,
outlink->time_base) + s->frames_out;
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if ((ret = ff_filter_frame(outlink, buf)) < 0) |
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return ret;
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s->frames_out++;
}
return 0;
}
return ret;
}
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static int write_to_fifo(AVFifoBuffer *fifo, AVFrame *buf) |
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{
int ret;
if (!av_fifo_space(fifo) && |
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(ret = av_fifo_realloc2(fifo, 2*av_fifo_size(fifo)))) { |
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av_frame_free(&buf); |
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return ret; |
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} |
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av_fifo_generic_write(fifo, &buf, sizeof(buf), NULL);
return 0;
}
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
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{
AVFilterContext *ctx = inlink->dst;
FPSContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int64_t delta; |
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int i, ret; |
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s->frames_in++;
/* discard frames until we get the first timestamp */ |
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if (s->first_pts == AV_NOPTS_VALUE) { |
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if (buf->pts != AV_NOPTS_VALUE) { |
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ret = write_to_fifo(s->fifo, buf);
if (ret < 0)
return ret;
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if (s->start_time != DBL_MAX && s->start_time != AV_NOPTS_VALUE) { |
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double first_pts = s->start_time * AV_TIME_BASE;
first_pts = FFMIN(FFMAX(first_pts, INT64_MIN), INT64_MAX); |
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s->first_pts = av_rescale_q(first_pts, AV_TIME_BASE_Q, |
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inlink->time_base);
av_log(ctx, AV_LOG_VERBOSE, "Set first pts to (in:%"PRId64" out:%"PRId64")\n",
s->first_pts, av_rescale_q(first_pts, AV_TIME_BASE_Q,
outlink->time_base));
} else { |
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s->first_pts = buf->pts; |
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} |
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} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
"timestamp.\n"); |
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av_frame_free(&buf); |
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s->drop++;
} |
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return 0; |
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}
/* now wait for the next timestamp */ |
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if (buf->pts == AV_NOPTS_VALUE || av_fifo_size(s->fifo) <= 0) { |
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return write_to_fifo(s->fifo, buf); |
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}
/* number of output frames */ |
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delta = av_rescale_q_rnd(buf->pts - s->first_pts, inlink->time_base,
outlink->time_base, s->rounding) - s->frames_out ; |
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if (delta < 1) {
/* drop the frame and everything buffered except the first */ |
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AVFrame *tmp;
int drop = av_fifo_size(s->fifo)/sizeof(AVFrame*); |
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av_log(ctx, AV_LOG_DEBUG, "Dropping %d frame(s).\n", drop);
s->drop += drop;
av_fifo_generic_read(s->fifo, &tmp, sizeof(tmp), NULL);
flush_fifo(s->fifo); |
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ret = write_to_fifo(s->fifo, tmp); |
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av_frame_free(&buf); |
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return ret; |
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}
/* can output >= 1 frames */
for (i = 0; i < delta; i++) { |
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AVFrame *buf_out; |
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av_fifo_generic_read(s->fifo, &buf_out, sizeof(buf_out), NULL);
/* duplicate the frame if needed */
if (!av_fifo_size(s->fifo) && i < delta - 1) { |
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AVFrame *dup = av_frame_clone(buf_out); |
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av_log(ctx, AV_LOG_DEBUG, "Duplicating frame.\n"); |
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if (dup)
ret = write_to_fifo(s->fifo, dup);
else
ret = AVERROR(ENOMEM);
if (ret < 0) { |
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av_frame_free(&buf_out);
av_frame_free(&buf); |
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return ret;
}
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s->dup++;
}
buf_out->pts = av_rescale_q(s->first_pts, inlink->time_base,
outlink->time_base) + s->frames_out;
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if ((ret = ff_filter_frame(outlink, buf_out)) < 0) { |
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av_frame_free(&buf); |
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return ret;
}
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s->frames_out++;
}
flush_fifo(s->fifo);
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ret = write_to_fifo(s->fifo, buf);
return ret; |
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}
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static const AVFilterPad avfilter_vf_fps_inputs[] = {
{ |
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.name = "default",
.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = filter_frame, |
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},
{ NULL }
};
static const AVFilterPad avfilter_vf_fps_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_props
},
{ NULL }
};
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AVFilter ff_vf_fps = { |
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.name = "fps", |
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.description = NULL_IF_CONFIG_SMALL("Force constant framerate."), |
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.init = init,
.uninit = uninit,
.priv_size = sizeof(FPSContext),
.priv_class = &fps_class,
.inputs = avfilter_vf_fps_inputs,
.outputs = avfilter_vf_fps_outputs, |
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}; |