| 1 | /* |
| 2 | * This file is part of FFmpeg. |
| 3 | * |
| 4 | * FFmpeg is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * FFmpeg is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with FFmpeg; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | /** |
| 20 | * @file |
| 21 | * audio volume filter |
| 22 | */ |
| 23 | |
| 24 | #ifndef AVFILTER_AF_VOLUME_H |
| 25 | #define AVFILTER_AF_VOLUME_H |
| 26 | |
| 27 | #include "libavutil/common.h" |
| 28 | #include "libavutil/eval.h" |
| 29 | #include "libavutil/float_dsp.h" |
| 30 | #include "libavutil/opt.h" |
| 31 | #include "libavutil/samplefmt.h" |
| 32 | |
| 33 | enum PrecisionType { |
| 34 | PRECISION_FIXED = 0, |
| 35 | PRECISION_FLOAT, |
| 36 | PRECISION_DOUBLE, |
| 37 | }; |
| 38 | |
| 39 | enum EvalMode { |
| 40 | EVAL_MODE_ONCE, |
| 41 | EVAL_MODE_FRAME, |
| 42 | EVAL_MODE_NB |
| 43 | }; |
| 44 | |
| 45 | enum VolumeVarName { |
| 46 | VAR_N, |
| 47 | VAR_NB_CHANNELS, |
| 48 | VAR_NB_CONSUMED_SAMPLES, |
| 49 | VAR_NB_SAMPLES, |
| 50 | VAR_POS, |
| 51 | VAR_PTS, |
| 52 | VAR_SAMPLE_RATE, |
| 53 | VAR_STARTPTS, |
| 54 | VAR_STARTT, |
| 55 | VAR_T, |
| 56 | VAR_TB, |
| 57 | VAR_VOLUME, |
| 58 | VAR_VARS_NB |
| 59 | }; |
| 60 | |
| 61 | enum ReplayGainType { |
| 62 | REPLAYGAIN_DROP, |
| 63 | REPLAYGAIN_IGNORE, |
| 64 | REPLAYGAIN_TRACK, |
| 65 | REPLAYGAIN_ALBUM, |
| 66 | }; |
| 67 | |
| 68 | typedef struct VolumeContext { |
| 69 | const AVClass *class; |
| 70 | AVFloatDSPContext fdsp; |
| 71 | enum PrecisionType precision; |
| 72 | enum EvalMode eval_mode; |
| 73 | const char *volume_expr; |
| 74 | AVExpr *volume_pexpr; |
| 75 | double var_values[VAR_VARS_NB]; |
| 76 | |
| 77 | enum ReplayGainType replaygain; |
| 78 | double replaygain_preamp; |
| 79 | int replaygain_noclip; |
| 80 | double volume; |
| 81 | int volume_i; |
| 82 | int channels; |
| 83 | int planes; |
| 84 | enum AVSampleFormat sample_fmt; |
| 85 | |
| 86 | void (*scale_samples)(uint8_t *dst, const uint8_t *src, int nb_samples, |
| 87 | int volume); |
| 88 | int samples_align; |
| 89 | } VolumeContext; |
| 90 | |
| 91 | void ff_volume_init_x86(VolumeContext *vol); |
| 92 | |
| 93 | #endif /* AVFILTER_AF_VOLUME_H */ |