mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-01-24 13:56:33 +02:00
Stefano Sabatini
parent
3c2c52baec
commit
07586b68a8
@ -18,6 +18,7 @@ version <next>:
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- 9bit and 10bit H.264 decoding
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- 9bit and 10bit FFV1 encoding / decoding
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- split filter added
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- select filter added
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version 0.7_beta1:
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116
doc/filters.texi
116
doc/filters.texi
@ -1163,6 +1163,122 @@ scale="trunc(3/2*iw/hsub)*hsub:trunc(3/2*ih/vsub)*vsub"
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scale='min(500\, iw*3/2):-1'
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@end example
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@section select
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Select frames to pass in output.
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It accepts in input an expression, which is evaluated for each input
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frame. If the expression is evaluated to a non-zero value, the frame
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is selected and passed to the output, otherwise it is discarded.
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The expression can contain the following constants:
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@table @option
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@item PI
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Greek PI
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@item PHI
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golden ratio
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@item E
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Euler number
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@item n
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the sequential number of the filtered frame, starting from 0
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@item selected_n
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the sequential number of the selected frame, starting from 0
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@item prev_selected_n
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the sequential number of the last selected frame, NAN if undefined
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@item TB
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timebase of the input timestamps
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@item pts
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the PTS (Presentation TimeStamp) of the filtered video frame,
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expressed in @var{TB} units, NAN if undefined
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@item t
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the PTS (Presentation TimeStamp) of the filtered video frame,
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expressed in seconds, NAN if undefined
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@item prev_pts
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the PTS of the previously filtered video frame, NAN if undefined
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@item prev_selected_pts
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the PTS of the last previously filtered video frame, NAN if undefined
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@item prev_selected_t
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the PTS of the last previously selected video frame, NAN if undefined
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@item start_pts
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the PTS of the first video frame in the video, NAN if undefined
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@item start_t
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the time of the first video frame in the video, NAN if undefined
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@item pict_type
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the picture type of the filtered frame, can assume one of the following
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values:
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@table @option
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@item PICT_TYPE_I
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@item PICT_TYPE_P
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@item PICT_TYPE_B
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@item PICT_TYPE_S
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@item PICT_TYPE_SI
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@item PICT_TYPE_SP
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@item PICT_TYPE_BI
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@end table
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@item interlace_type
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the frame interlace type, can assume one of the following values:
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@table @option
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@item INTERLACE_TYPE_P
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the frame is progressive (not interlaced)
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@item INTERLACE_TYPE_T
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the frame is top-field-first
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@item INTERLACE_TYPE_B
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the frame is bottom-field-first
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@end table
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@item key
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1 if the filtered frame is a key-frame, 0 otherwise
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@item pos
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the position in the file of the filtered frame, -1 if the information
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is not available (e.g. for synthetic video)
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@end table
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The default value of the select expression is "1".
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Some examples follow:
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@example
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# select all frames in input
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select
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# the above is the same as:
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select=1
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# skip all frames:
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select=0
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# select only I-frames
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select='eq(pict_type\,PICT_TYPE_I)'
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# select one frame every 100
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select='not(mod(n\,100))'
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# select only frames contained in the 10-20 time interval
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select='gte(t\,10)*lte(t\,20)'
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# select only I frames contained in the 10-20 time interval
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select='gte(t\,10)*lte(t\,20)*eq(pict_type\,PICT_TYPE_I)'
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# select frames with a minimum distance of 10 seconds
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select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
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@end example
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@anchor{setdar}
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@section setdar
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@ -46,6 +46,7 @@ OBJS-$(CONFIG_OVERLAY_FILTER) += vf_overlay.o
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OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
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OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
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OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
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OBJS-$(CONFIG_SELECT_FILTER) += vf_select.o
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OBJS-$(CONFIG_SETDAR_FILTER) += vf_aspect.o
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OBJS-$(CONFIG_SETPTS_FILTER) += vf_setpts.o
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OBJS-$(CONFIG_SETSAR_FILTER) += vf_aspect.o
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@ -62,6 +62,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (PAD, pad, vf);
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REGISTER_FILTER (PIXDESCTEST, pixdesctest, vf);
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REGISTER_FILTER (SCALE, scale, vf);
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REGISTER_FILTER (SELECT, select, vf);
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REGISTER_FILTER (SETDAR, setdar, vf);
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REGISTER_FILTER (SETPTS, setpts, vf);
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REGISTER_FILTER (SETSAR, setsar, vf);
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@ -26,7 +26,7 @@
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#include "libavutil/samplefmt.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 10
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#define LIBAVFILTER_VERSION_MINOR 11
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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351
libavfilter/vf_select.c
Normal file
351
libavfilter/vf_select.c
Normal file
@ -0,0 +1,351 @@
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/*
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* Copyright (c) 2011 Stefano Sabatini
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*
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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
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* 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
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*/
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/**
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* @file
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* filter for selecting which frame passes in the filterchain
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*/
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#include "libavutil/eval.h"
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#include "libavutil/fifo.h"
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#include "avfilter.h"
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static const char *var_names[] = {
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"E", ///< Euler number
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"PHI", ///< golden ratio
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"PI", ///< greek pi
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"TB", ///< timebase
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"pts", ///< original pts in the file of the frame
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"start_pts", ///< first PTS in the stream, expressed in TB units
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"prev_pts", ///< previous frame PTS
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"prev_selected_pts", ///< previous selected frame PTS
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"t", ///< first PTS in seconds
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"start_t", ///< first PTS in the stream, expressed in seconds
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"prev_t", ///< previous frame time
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"prev_selected_t", ///< previously selected time
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"pict_type", ///< the type of picture in the movie
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"PICT_TYPE_I",
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"PICT_TYPE_P",
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"PICT_TYPE_B",
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"PICT_TYPE_S",
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"PICT_TYPE_SI",
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"PICT_TYPE_SP",
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"PICT_TYPE_BI",
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"interlace_type", ///< the frame interlace type
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"INTERLACE_TYPE_P",
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"INTERLACE_TYPE_T",
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"INTERLACE_TYPE_B",
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"n", ///< frame number (starting from zero)
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"selected_n", ///< selected frame number (starting from zero)
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"prev_selected_n", ///< number of the last selected frame
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"key", ///< tell if the frame is a key frame
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"pos", ///< original position in the file of the frame
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NULL
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};
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enum var_name {
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VAR_E,
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VAR_PHI,
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VAR_PI,
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VAR_TB,
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VAR_PTS,
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VAR_START_PTS,
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VAR_PREV_PTS,
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VAR_PREV_SELECTED_PTS,
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VAR_T,
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VAR_START_T,
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VAR_PREV_T,
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VAR_PREV_SELECTED_T,
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VAR_PICT_TYPE,
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VAR_PICT_TYPE_I,
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VAR_PICT_TYPE_P,
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VAR_PICT_TYPE_B,
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VAR_PICT_TYPE_S,
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VAR_PICT_TYPE_SI,
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VAR_PICT_TYPE_SP,
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VAR_PICT_TYPE_BI,
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VAR_INTERLACE_TYPE,
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VAR_INTERLACE_TYPE_P,
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VAR_INTERLACE_TYPE_T,
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VAR_INTERLACE_TYPE_B,
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VAR_N,
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VAR_SELECTED_N,
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VAR_PREV_SELECTED_N,
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VAR_KEY,
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VAR_POS,
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VAR_VARS_NB
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};
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#define FIFO_SIZE 8
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typedef struct {
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AVExpr *expr;
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double var_values[VAR_VARS_NB];
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double select;
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int cache_frames;
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AVFifoBuffer *pending_frames; ///< FIFO buffer of video frames
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} SelectContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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SelectContext *select = ctx->priv;
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int ret;
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if ((ret = av_expr_parse(&select->expr, args ? args : "1",
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
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return ret;
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}
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select->pending_frames = av_fifo_alloc(FIFO_SIZE*sizeof(AVFilterBufferRef*));
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if (!select->pending_frames) {
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av_log(ctx, AV_LOG_ERROR, "Failed to allocate pending frames buffer.\n");
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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#define INTERLACE_TYPE_P 0
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#define INTERLACE_TYPE_T 1
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#define INTERLACE_TYPE_B 2
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static int config_input(AVFilterLink *inlink)
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{
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SelectContext *select = inlink->dst->priv;
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select->var_values[VAR_E] = M_E;
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select->var_values[VAR_PHI] = M_PHI;
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select->var_values[VAR_PI] = M_PI;
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select->var_values[VAR_N] = 0.0;
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select->var_values[VAR_SELECTED_N] = 0.0;
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select->var_values[VAR_TB] = av_q2d(inlink->time_base);
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select->var_values[VAR_PREV_PTS] = NAN;
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select->var_values[VAR_PREV_SELECTED_PTS] = NAN;
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select->var_values[VAR_PREV_SELECTED_T] = NAN;
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select->var_values[VAR_START_PTS] = NAN;
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select->var_values[VAR_START_T] = NAN;
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select->var_values[VAR_PICT_TYPE_I] = AV_PICTURE_TYPE_I;
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select->var_values[VAR_PICT_TYPE_P] = AV_PICTURE_TYPE_P;
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select->var_values[VAR_PICT_TYPE_B] = AV_PICTURE_TYPE_B;
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select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;
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select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;
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select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;
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select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
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select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;;
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return 0;
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}
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#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
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{
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SelectContext *select = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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double res;
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if (isnan(select->var_values[VAR_START_PTS]))
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select->var_values[VAR_START_PTS] = TS2D(picref->pts);
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select->var_values[VAR_PTS] = TS2D(picref->pts);
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select->var_values[VAR_T ] = picref->pts * av_q2d(inlink->time_base);
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select->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
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select->var_values[VAR_PREV_PTS] = TS2D(picref ->pts);
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select->var_values[VAR_INTERLACE_TYPE] =
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!picref->video->interlaced ? INTERLACE_TYPE_P :
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picref->video->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
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select->var_values[VAR_PICT_TYPE] = picref->video->pict_type;
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res = av_expr_eval(select->expr, select->var_values, NULL);
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av_log(inlink->dst, AV_LOG_DEBUG,
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"n:%d pts:%d t:%f pos:%d interlace_type:%c key:%d pict_type:%c "
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"-> select:%f\n",
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(int)select->var_values[VAR_N],
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(int)select->var_values[VAR_PTS],
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select->var_values[VAR_T],
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(int)select->var_values[VAR_POS],
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select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_P ? 'P' :
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select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_T ? 'T' :
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select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_B ? 'B' : '?',
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(int)select->var_values[VAR_KEY],
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av_get_picture_type_char(select->var_values[VAR_PICT_TYPE]),
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res);
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select->var_values[VAR_N] += 1.0;
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if (res) {
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select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
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select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
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select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
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select->var_values[VAR_SELECTED_N] += 1.0;
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}
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return res;
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}
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static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
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{
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SelectContext *select = inlink->dst->priv;
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select->select = select_frame(inlink->dst, picref);
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if (select->select) {
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/* frame was requested through poll_frame */
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if (select->cache_frames) {
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if (!av_fifo_space(select->pending_frames))
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av_log(inlink->dst, AV_LOG_ERROR,
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"Buffering limit reached, cannot cache more frames\n");
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else
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av_fifo_generic_write(select->pending_frames, &picref,
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sizeof(picref), NULL);
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return;
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}
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avfilter_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
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}
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
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{
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SelectContext *select = inlink->dst->priv;
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if (select->select && !select->cache_frames)
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avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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}
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static void end_frame(AVFilterLink *inlink)
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{
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SelectContext *select = inlink->dst->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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if (select->select) {
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if (select->cache_frames)
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return;
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avfilter_end_frame(inlink->dst->outputs[0]);
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}
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avfilter_unref_buffer(picref);
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SelectContext *select = ctx->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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select->select = 0;
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if (av_fifo_size(select->pending_frames)) {
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AVFilterBufferRef *picref;
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av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
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avfilter_start_frame(outlink, avfilter_ref_buffer(picref, ~0));
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avfilter_draw_slice(outlink, 0, outlink->h, 1);
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avfilter_end_frame(outlink);
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avfilter_unref_buffer(picref);
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return 0;
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}
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while (!select->select) {
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int ret = avfilter_request_frame(inlink);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int poll_frame(AVFilterLink *outlink)
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{
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SelectContext *select = outlink->src->priv;
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AVFilterLink *inlink = outlink->src->inputs[0];
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int count, ret;
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if (!av_fifo_size(select->pending_frames)) {
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if ((count = avfilter_poll_frame(inlink)) <= 0)
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return count;
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/* request frame from input, and apply select condition to it */
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select->cache_frames = 1;
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while (count-- && av_fifo_space(select->pending_frames)) {
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ret = avfilter_request_frame(inlink);
|
||||
if (ret < 0)
|
||||
break;
|
||||
}
|
||||
select->cache_frames = 0;
|
||||
}
|
||||
|
||||
return av_fifo_size(select->pending_frames)/sizeof(AVFilterBufferRef *);
|
||||
}
|
||||
|
||||
static av_cold void uninit(AVFilterContext *ctx)
|
||||
{
|
||||
SelectContext *select = ctx->priv;
|
||||
AVFilterBufferRef *picref;
|
||||
int i;
|
||||
|
||||
av_expr_free(select->expr);
|
||||
select->expr = NULL;
|
||||
|
||||
for (i = 0; i < av_fifo_size(select->pending_frames)/sizeof(picref); i++) {
|
||||
av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
|
||||
avfilter_unref_buffer(picref);
|
||||
}
|
||||
av_fifo_free(select->pending_frames);
|
||||
}
|
||||
|
||||
AVFilter avfilter_vf_select = {
|
||||
.name = "select",
|
||||
.description = NULL_IF_CONFIG_SMALL("Select frames to pass in output."),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
|
||||
.priv_size = sizeof(SelectContext),
|
||||
|
||||
.inputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.get_video_buffer = avfilter_null_get_video_buffer,
|
||||
.config_props = config_input,
|
||||
.start_frame = start_frame,
|
||||
.draw_slice = draw_slice,
|
||||
.end_frame = end_frame },
|
||||
{ .name = NULL }},
|
||||
.outputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.poll_frame = poll_frame,
|
||||
.request_frame = request_frame, },
|
||||
{ .name = NULL}},
|
||||
};
|
||||
Loading…
x
Reference in New Issue
Block a user