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 * Bauer stereo-to-binaural filter 22 */ 23 24#include <bs2b.h> 25 26#include "libavutil/channel_layout.h" 27#include "libavutil/common.h" 28#include "libavutil/opt.h" 29 30#include "audio.h" 31#include "avfilter.h" 32#include "formats.h" 33#include "internal.h" 34 35typedef struct Bs2bContext { 36 const AVClass *class; 37 38 int profile; 39 int fcut; 40 int feed; 41 42 t_bs2bdp bs2bp; 43 44 void (*filter)(t_bs2bdp bs2bdp, uint8_t *sample, int n); 45} Bs2bContext; 46 47#define OFFSET(x) offsetof(Bs2bContext, x) 48#define A AV_OPT_FLAG_AUDIO_PARAM 49 50static const AVOption options[] = { 51 { "profile", "Apply a pre-defined crossfeed level", 52 OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" }, 53 { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" }, 54 { "cmoy", "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL }, 0, 0, A, "profile" }, 55 { "jmeier", "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL }, 0, 0, A, "profile" }, 56 { "fcut", "Set cut frequency (in Hz)", 57 OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A }, 58 { "feed", "Set feed level (in Hz)", 59 OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A }, 60 { NULL }, 61}; 62 63static const AVClass bs2b_class = { 64 .class_name = "bs2b filter", 65 .item_name = av_default_item_name, 66 .option = options, 67 .version = LIBAVUTIL_VERSION_INT, 68}; 69 70static av_cold int init(AVFilterContext *ctx) 71{ 72 Bs2bContext *bs2b = ctx->priv; 73 74 if (!(bs2b->bs2bp = bs2b_open())) 75 return AVERROR(ENOMEM); 76 77 bs2b_set_level(bs2b->bs2bp, bs2b->profile); 78 79 if (bs2b->fcut) 80 bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut); 81 82 if (bs2b->feed) 83 bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed); 84 85 return 0; 86} 87 88static av_cold void uninit(AVFilterContext *ctx) 89{ 90 Bs2bContext *bs2b = ctx->priv; 91 92 if (bs2b->bs2bp) 93 bs2b_close(bs2b->bs2bp); 94} 95 96static int query_formats(AVFilterContext *ctx) 97{ 98 AVFilterFormats *formats = NULL; 99 AVFilterChannelLayouts *layouts = NULL; 100 101 static const enum AVSampleFormat sample_fmts[] = { 102 AV_SAMPLE_FMT_U8, 103 AV_SAMPLE_FMT_S16, 104 AV_SAMPLE_FMT_S32, 105 AV_SAMPLE_FMT_FLT, 106 AV_SAMPLE_FMT_DBL, 107 AV_SAMPLE_FMT_NONE, 108 }; 109 110 if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0) 111 return AVERROR(ENOMEM); 112 ff_set_common_channel_layouts(ctx, layouts); 113 114 formats = ff_make_format_list(sample_fmts); 115 if (!formats) 116 return AVERROR(ENOMEM); 117 ff_set_common_formats(ctx, formats); 118 119 formats = ff_all_samplerates(); 120 if (!formats) 121 return AVERROR(ENOMEM); 122 ff_set_common_samplerates(ctx, formats); 123 124 return 0; 125} 126 127static int filter_frame(AVFilterLink *inlink, AVFrame *frame) 128{ 129 int ret; 130 AVFrame *out_frame; 131 132 Bs2bContext *bs2b = inlink->dst->priv; 133 AVFilterLink *outlink = inlink->dst->outputs[0]; 134 135 if (av_frame_is_writable(frame)) { 136 out_frame = frame; 137 } else { 138 out_frame = ff_get_audio_buffer(inlink, frame->nb_samples); 139 if (!out_frame) 140 return AVERROR(ENOMEM); 141 av_frame_copy(out_frame, frame); 142 ret = av_frame_copy_props(out_frame, frame); 143 if (ret < 0) { 144 av_frame_free(&out_frame); 145 av_frame_free(&frame); 146 return ret; 147 } 148 } 149 150 bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples); 151 152 if (frame != out_frame) 153 av_frame_free(&frame); 154 155 return ff_filter_frame(outlink, out_frame); 156} 157 158static int config_output(AVFilterLink *outlink) 159{ 160 AVFilterContext *ctx = outlink->src; 161 Bs2bContext *bs2b = ctx->priv; 162 AVFilterLink *inlink = ctx->inputs[0]; 163 164 int srate = inlink->sample_rate; 165 166 switch (inlink->format) { 167 case AV_SAMPLE_FMT_U8: 168 bs2b->filter = bs2b_cross_feed_u8; 169 break; 170 case AV_SAMPLE_FMT_S16: 171 bs2b->filter = (void*)bs2b_cross_feed_s16; 172 break; 173 case AV_SAMPLE_FMT_S32: 174 bs2b->filter = (void*)bs2b_cross_feed_s32; 175 break; 176 case AV_SAMPLE_FMT_FLT: 177 bs2b->filter = (void*)bs2b_cross_feed_f; 178 break; 179 case AV_SAMPLE_FMT_DBL: 180 bs2b->filter = (void*)bs2b_cross_feed_d; 181 break; 182 default: 183 return AVERROR_BUG; 184 } 185 186 if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE)) 187 return AVERROR(ENOSYS); 188 189 bs2b_set_srate(bs2b->bs2bp, srate); 190 191 return 0; 192} 193 194static const AVFilterPad bs2b_inputs[] = { 195 { 196 .name = "default", 197 .type = AVMEDIA_TYPE_AUDIO, 198 .filter_frame = filter_frame, 199 }, 200 { NULL } 201}; 202 203static const AVFilterPad bs2b_outputs[] = { 204 { 205 .name = "default", 206 .type = AVMEDIA_TYPE_AUDIO, 207 .config_props = config_output, 208 }, 209 { NULL } 210}; 211 212AVFilter ff_af_bs2b = { 213 .name = "bs2b", 214 .description = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."), 215 .query_formats = query_formats, 216 .priv_size = sizeof(Bs2bContext), 217 .priv_class = &bs2b_class, 218 .init = init, 219 .uninit = uninit, 220 .inputs = bs2b_inputs, 221 .outputs = bs2b_outputs, 222}; 223