From b384e031daeb1ac612620985e3e5377bc587559c Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sat, 29 Sep 2012 00:38:13 -0400 Subject: lavfi: add volume filter Based on the volume filter in FFmpeg written by Stefano Sabatini . --- libavfilter/af_volume.h | 53 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 libavfilter/af_volume.h (limited to 'libavfilter/af_volume.h') diff --git a/libavfilter/af_volume.h b/libavfilter/af_volume.h new file mode 100644 index 0000000..dec8767 --- /dev/null +++ b/libavfilter/af_volume.h @@ -0,0 +1,53 @@ +/* + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * audio volume filter + */ + +#ifndef AVFILTER_AF_VOLUME_H +#define AVFILTER_AF_VOLUME_H + +#include "libavutil/common.h" +#include "libavutil/float_dsp.h" +#include "libavutil/opt.h" +#include "libavutil/samplefmt.h" + +enum PrecisionType { + PRECISION_FIXED = 0, + PRECISION_FLOAT, + PRECISION_DOUBLE, +}; + +typedef struct VolumeContext { + const AVClass *class; + AVFloatDSPContext fdsp; + enum PrecisionType precision; + double volume; + int volume_i; + int channels; + int planes; + enum AVSampleFormat sample_fmt; + + void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples, + int volume); + int samples_align; +} VolumeContext; + +#endif /* AVFILTER_AF_VOLUME_H */ -- cgit v1.1