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https://github.com/FFmpeg/FFmpeg.git
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7619a87cc8
The eval mode allows to evaluate the expression per-frame or just at init. In particular, address ticket #3234.
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
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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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* audio volume filter
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*/
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#ifndef AVFILTER_AF_VOLUME_H
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#define AVFILTER_AF_VOLUME_H
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/float_dsp.h"
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#include "libavutil/opt.h"
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#include "libavutil/samplefmt.h"
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enum PrecisionType {
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PRECISION_FIXED = 0,
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PRECISION_FLOAT,
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PRECISION_DOUBLE,
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};
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enum EvalMode {
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EVAL_MODE_ONCE,
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EVAL_MODE_FRAME,
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EVAL_MODE_NB
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};
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enum VolumeVarName {
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VAR_N,
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VAR_NB_CHANNELS,
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VAR_NB_CONSUMED_SAMPLES,
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VAR_NB_SAMPLES,
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VAR_POS,
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VAR_PTS,
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VAR_SAMPLE_RATE,
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VAR_STARTPTS,
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VAR_STARTT,
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VAR_T,
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VAR_TB,
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VAR_VOLUME,
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VAR_VARS_NB
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};
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typedef struct VolumeContext {
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const AVClass *class;
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AVFloatDSPContext fdsp;
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enum PrecisionType precision;
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enum EvalMode eval_mode;
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const char *volume_expr;
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AVExpr *volume_pexpr;
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double var_values[VAR_VARS_NB];
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double volume;
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int volume_i;
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int channels;
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int planes;
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enum AVSampleFormat sample_fmt;
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void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples,
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int volume);
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int samples_align;
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} VolumeContext;
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void ff_volume_init_x86(VolumeContext *vol);
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#endif /* AVFILTER_AF_VOLUME_H */
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