ffmpeg/libavfilter/vf_fps.c

290 lines
8.6 KiB
C
Raw Normal View History

/*
* Copyright 2007 Bobby Bingham
* Copyright 2012 Robert Nagy <ronag89 gmail com>
* Copyright 2012 Anton Khirnov <anton khirnov net>
*
* 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
*/
/**
* @file
* a filter enforcing given constant framerate
*/
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
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
int64_t pts; ///< pts of the first frame currently in the fifo
AVRational framerate; ///< target framerate
int rounding; ///< AVRounding method for timestamps
/* 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
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption fps_options[] = {
{ "fps", "A string describing desired output framerate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, { .str = "25" }, .flags = V|F },
{ "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" },
{ NULL },
};
AVFILTER_DEFINE_CLASS(fps);
static av_cold int init(AVFilterContext *ctx)
{
FPSContext *s = ctx->priv;
if (!(s->fifo = av_fifo_alloc(2*sizeof(AVFrame*))))
return AVERROR(ENOMEM);
s->pts = AV_NOPTS_VALUE;
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)) {
AVFrame *tmp;
av_fifo_generic_read(fifo, &tmp, sizeof(tmp), NULL);
av_frame_free(&tmp);
}
}
static av_cold void uninit(AVFilterContext *ctx)
{
FPSContext *s = ctx->priv;
if (s->fifo) {
Merge commit '7e350379f87e7f74420b4813170fe808e2313911' * commit '7e350379f87e7f74420b4813170fe808e2313911': lavfi: switch to AVFrame. Conflicts: doc/filters.texi libavfilter/af_ashowinfo.c libavfilter/audio.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/buffersink.c libavfilter/buffersrc.c libavfilter/buffersrc.h libavfilter/f_select.c libavfilter/f_setpts.c libavfilter/fifo.c libavfilter/split.c libavfilter/src_movie.c libavfilter/version.h libavfilter/vf_aspect.c libavfilter/vf_bbox.c libavfilter/vf_blackframe.c libavfilter/vf_delogo.c libavfilter/vf_drawbox.c libavfilter/vf_drawtext.c libavfilter/vf_fade.c libavfilter/vf_fieldorder.c libavfilter/vf_fps.c libavfilter/vf_frei0r.c libavfilter/vf_gradfun.c libavfilter/vf_hqdn3d.c libavfilter/vf_lut.c libavfilter/vf_overlay.c libavfilter/vf_pad.c libavfilter/vf_scale.c libavfilter/vf_showinfo.c libavfilter/vf_transpose.c libavfilter/vf_vflip.c libavfilter/vf_yadif.c libavfilter/video.c libavfilter/vsrc_testsrc.c libavfilter/yadif.h Following are notes about the merge authorship and various technical details. Michael Niedermayer: * Main merge operation, notably avfilter.c and video.c * Switch to AVFrame: - afade - anullsrc - apad - aresample - blackframe - deshake - idet - il - mandelbrot - mptestsrc - noise - setfield - smartblur - tinterlace * various merge changes and fixes in: - ashowinfo - blackdetect - field - fps - select - testsrc - yadif Nicolas George: * Switch to AVFrame: - make rawdec work with refcounted frames. Adapted from commit 759001c534287a96dc96d1e274665feb7059145d by Anton Khirnov. Also, fix the use of || instead of | in a flags check. - make buffer sink and src, audio and video work all together Clément Bœsch: * Switch to AVFrame: - aevalsrc - alphaextract - blend - cellauto - colormatrix - concat - earwax - ebur128 - edgedetect - geq - histeq - histogram - hue - kerndeint - life - movie - mp (with the help of Michael) - overlay - pad - pan - pp - pp - removelogo - sendcmd - showspectrum - showwaves - silencedetect - stereo3d - subtitles - super2xsai - swapuv - thumbnail - tile Hendrik Leppkes: * Switch to AVFrame: - aconvert - amerge - asetnsamples - atempo - biquads Matthieu Bouron: * Switch to AVFrame - alphamerge - decimate - volumedetect Stefano Sabatini: * Switch to AVFrame: - astreamsync - flite - framestep Signed-off-by: Michael Niedermayer <michaelni@gmx.at> Signed-off-by: Nicolas George <nicolas.george@normalesup.org> Signed-off-by: Clément Bœsch <ubitux@gmail.com> Signed-off-by: Hendrik Leppkes <h.leppkes@gmail.com> Signed-off-by: Matthieu Bouron <matthieu.bouron@gmail.com> Signed-off-by: Stefano Sabatini <stefasab@gmail.com> Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-03-10 01:30:30 +01:00
s->drop += av_fifo_size(s->fifo) / sizeof(AVFrame*);
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;
link->time_base = av_inv_q(s->framerate);
2012-06-10 10:53:03 +02:00
link->frame_rate= s->framerate;
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)
ret = ff_request_frame(ctx->inputs[0]);
/* flush the fifo */
if (ret == AVERROR_EOF && av_fifo_size(s->fifo)) {
int i;
for (i = 0; av_fifo_size(s->fifo); i++) {
AVFrame *buf;
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;
if ((ret = ff_filter_frame(outlink, buf)) < 0)
return ret;
s->frames_out++;
}
return 0;
}
return ret;
}
static int write_to_fifo(AVFifoBuffer *fifo, AVFrame *buf)
{
int ret;
if (!av_fifo_space(fifo) &&
(ret = av_fifo_realloc2(fifo, 2*av_fifo_size(fifo)))) {
av_frame_free(&buf);
return ret;
}
av_fifo_generic_write(fifo, &buf, sizeof(buf), NULL);
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
{
AVFilterContext *ctx = inlink->dst;
FPSContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int64_t delta;
int i, ret;
s->frames_in++;
/* discard frames until we get the first timestamp */
if (s->pts == AV_NOPTS_VALUE) {
if (buf->pts != AV_NOPTS_VALUE) {
2012-07-15 10:07:59 +02:00
ret = write_to_fifo(s->fifo, buf);
if (ret < 0)
return ret;
s->first_pts = s->pts = buf->pts;
} else {
av_log(ctx, AV_LOG_WARNING, "Discarding initial frame(s) with no "
"timestamp.\n");
av_frame_free(&buf);
s->drop++;
}
return 0;
}
/* now wait for the next timestamp */
if (buf->pts == AV_NOPTS_VALUE) {
return write_to_fifo(s->fifo, buf);
}
/* number of output frames */
delta = av_rescale_q_rnd(buf->pts - s->pts, inlink->time_base,
outlink->time_base, s->rounding);
if (delta < 1) {
/* drop the frame and everything buffered except the first */
AVFrame *tmp;
int drop = av_fifo_size(s->fifo)/sizeof(AVFrame*);
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);
ret = write_to_fifo(s->fifo, tmp);
av_frame_free(&buf);
return ret;
}
/* can output >= 1 frames */
for (i = 0; i < delta; i++) {
AVFrame *buf_out;
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) {
AVFrame *dup = av_frame_clone(buf_out);
2012-07-15 10:07:59 +02:00
av_log(ctx, AV_LOG_DEBUG, "Duplicating frame.\n");
2012-07-15 10:07:59 +02:00
if (dup)
ret = write_to_fifo(s->fifo, dup);
else
ret = AVERROR(ENOMEM);
if (ret < 0) {
av_frame_free(&buf_out);
av_frame_free(&buf);
2012-07-15 10:07:59 +02:00
return ret;
}
s->dup++;
}
buf_out->pts = av_rescale_q(s->first_pts, inlink->time_base,
outlink->time_base) + s->frames_out;
if ((ret = ff_filter_frame(outlink, buf_out)) < 0) {
av_frame_free(&buf);
return ret;
}
s->frames_out++;
}
flush_fifo(s->fifo);
ret = write_to_fifo(s->fifo, buf);
s->pts = s->first_pts + av_rescale_q(s->frames_out, outlink->time_base, inlink->time_base);
return ret;
}
static const AVFilterPad avfilter_vf_fps_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_vf_fps_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_props
},
{ NULL }
};
AVFilter avfilter_vf_fps = {
.name = "fps",
.description = NULL_IF_CONFIG_SMALL("Force constant framerate."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(FPSContext),
.priv_class = &fps_class,
.inputs = avfilter_vf_fps_inputs,
.outputs = avfilter_vf_fps_outputs,
};