libavfilter/af_bs2b.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; 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
  35 typedef void (*filter_func)(t_bs2bdp bs2bdp, uint8_t *sample, int n);
  36
  37 typedef struct Bs2bContext {
  38     const AVClass *class;
  39
  40     int profile;
  41     int fcut;
  42     int feed;
  43
  44     t_bs2bdp bs2bp;
  45
  46     filter_func filter;
  47 } Bs2bContext;
  48
  49 #define OFFSET(x) offsetof(Bs2bContext, x)
  50 #define A AV_OPT_FLAG_AUDIO_PARAM
  51
  52 static const AVOption options[] = {
  53     { "profile", "Apply a pre-defined crossfeed level",
  54             OFFSET(profile), AV_OPT_TYPE_INT, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, INT_MAX, A, "profile" },
  55         { "default", "default profile", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_DEFAULT_CLEVEL }, 0, 0, A, "profile" },
  56         { "cmoy",    "Chu Moy circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_CMOY_CLEVEL    }, 0, 0, A, "profile" },
  57         { "jmeier",  "Jan Meier circuit", 0, AV_OPT_TYPE_CONST, { .i64 = BS2B_JMEIER_CLEVEL  }, 0, 0, A, "profile" },
  58     { "fcut", "Set cut frequency (in Hz)",
  59             OFFSET(fcut), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFCUT, A },
  60     { "feed", "Set feed level (in Hz)",
  61             OFFSET(feed), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, BS2B_MAXFEED, A },
  62     { NULL },
  63 };
  64
  65 static const AVClass bs2b_class = {
  66     .class_name = "bs2b filter",
  67     .item_name  = av_default_item_name,
  68     .option     = options,
  69     .version    = LIBAVUTIL_VERSION_INT,
  70 };
  71
  72 static av_cold int init(AVFilterContext *ctx)
  73 {
  74     Bs2bContext *bs2b = ctx->priv;
  75
  76     if (!(bs2b->bs2bp = bs2b_open()))
  77         return AVERROR(ENOMEM);
  78
  79     bs2b_set_level(bs2b->bs2bp, bs2b->profile);
  80
  81     if (bs2b->fcut)
  82         bs2b_set_level_fcut(bs2b->bs2bp, bs2b->fcut);
  83
  84     if (bs2b->feed)
  85         bs2b_set_level_feed(bs2b->bs2bp, bs2b->feed);
  86
  87     return 0;
  88 }
  89
  90 static av_cold void uninit(AVFilterContext *ctx)
  91 {
  92     Bs2bContext *bs2b = ctx->priv;
  93
  94     if (bs2b->bs2bp)
  95         bs2b_close(bs2b->bs2bp);
  96 }
  97
  98 static int query_formats(AVFilterContext *ctx)
  99 {
 100     AVFilterFormats *formats = NULL;
 101     AVFilterChannelLayouts *layouts = NULL;
 102
 103     static const enum AVSampleFormat sample_fmts[] = {
 104         AV_SAMPLE_FMT_U8,
 105         AV_SAMPLE_FMT_S16,
 106         AV_SAMPLE_FMT_S32,
 107         AV_SAMPLE_FMT_FLT,
 108         AV_SAMPLE_FMT_DBL,
 109         AV_SAMPLE_FMT_NONE,
 110     };
 111
 112     if (ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO) != 0)
 113         return AVERROR(ENOMEM);
 114     ff_set_common_channel_layouts(ctx, layouts);
 115
 116     formats = ff_make_format_list(sample_fmts);
 117     if (!formats)
 118         return AVERROR(ENOMEM);
 119     ff_set_common_formats(ctx, formats);
 120
 121     formats = ff_all_samplerates();
 122     if (!formats)
 123         return AVERROR(ENOMEM);
 124     ff_set_common_samplerates(ctx, formats);
 125
 126     return 0;
 127 }
 128
 129 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 130 {
 131     int ret;
 132     AVFrame *out_frame;
 133
 134     Bs2bContext     *bs2b = inlink->dst->priv;
 135     AVFilterLink *outlink = inlink->dst->outputs[0];
 136
 137     if (av_frame_is_writable(frame)) {
 138         out_frame = frame;
 139     } else {
 140         out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
 141         if (!out_frame)
 142             return AVERROR(ENOMEM);
 143         av_frame_copy(out_frame, frame);
 144         ret = av_frame_copy_props(out_frame, frame);
 145         if (ret < 0) {
 146             av_frame_free(&out_frame);
 147             av_frame_free(&frame);
 148             return ret;
 149         }
 150     }
 151
 152     bs2b->filter(bs2b->bs2bp, out_frame->extended_data[0], out_frame->nb_samples);
 153
 154     if (frame != out_frame)
 155         av_frame_free(&frame);
 156
 157     return ff_filter_frame(outlink, out_frame);
 158 }
 159
 160 static int config_output(AVFilterLink *outlink)
 161 {
 162     AVFilterContext *ctx = outlink->src;
 163     Bs2bContext    *bs2b = ctx->priv;
 164     AVFilterLink *inlink = ctx->inputs[0];
 165
 166     int srate = inlink->sample_rate;
 167
 168     switch (inlink->format) {
 169     case AV_SAMPLE_FMT_U8:
 170         bs2b->filter = (filter_func) bs2b_cross_feed_u8;
 171         break;
 172     case AV_SAMPLE_FMT_S16:
 173         bs2b->filter = (filter_func) bs2b_cross_feed_s16;
 174         break;
 175     case AV_SAMPLE_FMT_S32:
 176         bs2b->filter = (filter_func) bs2b_cross_feed_s32;
 177         break;
 178     case AV_SAMPLE_FMT_FLT:
 179         bs2b->filter = (filter_func) bs2b_cross_feed_f;
 180         break;
 181     case AV_SAMPLE_FMT_DBL:
 182         bs2b->filter = (filter_func) bs2b_cross_feed_d;
 183         break;
 184     default:
 185         return AVERROR_BUG;
 186     }
 187
 188     if ((srate < BS2B_MINSRATE) || (srate > BS2B_MAXSRATE))
 189         return AVERROR(ENOSYS);
 190
 191     bs2b_set_srate(bs2b->bs2bp, srate);
 192
 193     return 0;
 194 }
 195
 196 static const AVFilterPad bs2b_inputs[] = {
 197     {
 198         .name           = "default",
 199         .type           = AVMEDIA_TYPE_AUDIO,
 200         .filter_frame   = filter_frame,
 201     },
 202     { NULL }
 203 };
 204
 205 static const AVFilterPad bs2b_outputs[] = {
 206     {
 207         .name           = "default",
 208         .type           = AVMEDIA_TYPE_AUDIO,
 209         .config_props   = config_output,
 210     },
 211     { NULL }
 212 };
 213
 214 AVFilter ff_af_bs2b = {
 215     .name           = "bs2b",
 216     .description    = NULL_IF_CONFIG_SMALL("Bauer stereo-to-binaural filter."),
 217     .query_formats  = query_formats,
 218     .priv_size      = sizeof(Bs2bContext),
 219     .priv_class     = &bs2b_class,
 220     .init           = init,
 221     .uninit         = uninit,
 222     .inputs         = bs2b_inputs,
 223     .outputs        = bs2b_outputs,
 224 };