LCOV - code coverage report
Current view: top level - libavfilter - af_acontrast.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 78 0.0 %
Date: 2017-12-16 01:21:47 Functions: 0 7 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2008 Rob Sykes
       3             :  * Copyright (c) 2017 Paul B Mahol
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/channel_layout.h"
      23             : #include "libavutil/opt.h"
      24             : #include "avfilter.h"
      25             : #include "audio.h"
      26             : #include "formats.h"
      27             : 
      28             : typedef struct AudioContrastContext {
      29             :     const AVClass *class;
      30             :     float contrast;
      31             :     void (*filter)(void **dst, const void **src,
      32             :                    int nb_samples, int channels, float contrast);
      33             : } AudioContrastContext;
      34             : 
      35             : #define OFFSET(x) offsetof(AudioContrastContext, x)
      36             : #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      37             : 
      38             : static const AVOption acontrast_options[] = {
      39             :     { "contrast", "set contrast", OFFSET(contrast), AV_OPT_TYPE_FLOAT, {.dbl=33}, 0, 100, A },
      40             :     { NULL }
      41             : };
      42             : 
      43             : AVFILTER_DEFINE_CLASS(acontrast);
      44             : 
      45           0 : static int query_formats(AVFilterContext *ctx)
      46             : {
      47           0 :     AVFilterFormats *formats = NULL;
      48           0 :     AVFilterChannelLayouts *layouts = NULL;
      49             :     static const enum AVSampleFormat sample_fmts[] = {
      50             :         AV_SAMPLE_FMT_FLT, AV_SAMPLE_FMT_FLTP,
      51             :         AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBLP,
      52             :         AV_SAMPLE_FMT_NONE
      53             :     };
      54             :     int ret;
      55             : 
      56           0 :     formats = ff_make_format_list(sample_fmts);
      57           0 :     if (!formats)
      58           0 :         return AVERROR(ENOMEM);
      59           0 :     ret = ff_set_common_formats(ctx, formats);
      60           0 :     if (ret < 0)
      61           0 :         return ret;
      62             : 
      63           0 :     layouts = ff_all_channel_counts();
      64           0 :     if (!layouts)
      65           0 :         return AVERROR(ENOMEM);
      66             : 
      67           0 :     ret = ff_set_common_channel_layouts(ctx, layouts);
      68           0 :     if (ret < 0)
      69           0 :         return ret;
      70             : 
      71           0 :     formats = ff_all_samplerates();
      72           0 :     return ff_set_common_samplerates(ctx, formats);
      73             : }
      74             : 
      75           0 : static void filter_flt(void **d, const void **s,
      76             :                        int nb_samples, int channels,
      77             :                        float contrast)
      78             : {
      79           0 :     const float *src = s[0];
      80           0 :     float *dst = d[0];
      81             :     int n, c;
      82             : 
      83           0 :     for (n = 0; n < nb_samples; n++) {
      84           0 :         for (c = 0; c < channels; c++) {
      85           0 :             float d = src[c] * M_PI_2;
      86             : 
      87           0 :             dst[c] = sinf(d + contrast * sinf(d * 4));
      88             :         }
      89             : 
      90           0 :         dst += c;
      91           0 :         src += c;
      92             :     }
      93           0 : }
      94             : 
      95           0 : static void filter_dbl(void **d, const void **s,
      96             :                        int nb_samples, int channels,
      97             :                        float contrast)
      98             : {
      99           0 :     const double *src = s[0];
     100           0 :     double *dst = d[0];
     101             :     int n, c;
     102             : 
     103           0 :     for (n = 0; n < nb_samples; n++) {
     104           0 :         for (c = 0; c < channels; c++) {
     105           0 :             double d = src[c] * M_PI_2;
     106             : 
     107           0 :             dst[c] = sin(d + contrast * sin(d * 4));
     108             :         }
     109             : 
     110           0 :         dst += c;
     111           0 :         src += c;
     112             :     }
     113           0 : }
     114             : 
     115           0 : static void filter_fltp(void **d, const void **s,
     116             :                         int nb_samples, int channels,
     117             :                         float contrast)
     118             : {
     119             :     int n, c;
     120             : 
     121           0 :     for (c = 0; c < channels; c++) {
     122           0 :         const float *src = s[c];
     123           0 :         float *dst = d[c];
     124             : 
     125           0 :         for (n = 0; n < nb_samples; n++) {
     126           0 :             float d = src[n] * M_PI_2;
     127             : 
     128           0 :             dst[n] = sinf(d + contrast * sinf(d * 4));
     129             :         }
     130             :     }
     131           0 : }
     132             : 
     133           0 : static void filter_dblp(void **d, const void **s,
     134             :                         int nb_samples, int channels,
     135             :                         float contrast)
     136             : {
     137             :     int n, c;
     138             : 
     139           0 :     for (c = 0; c < channels; c++) {
     140           0 :         const double *src = s[c];
     141           0 :         double *dst = d[c];
     142             : 
     143           0 :         for (n = 0; n < nb_samples; n++) {
     144           0 :             double d = src[n] * M_PI_2;
     145             : 
     146           0 :             dst[n] = sin(d + contrast * sin(d * 4));
     147             :         }
     148             :     }
     149           0 : }
     150             : 
     151           0 : static int config_input(AVFilterLink *inlink)
     152             : {
     153           0 :     AVFilterContext *ctx = inlink->dst;
     154           0 :     AudioContrastContext *s    = ctx->priv;
     155             : 
     156           0 :     switch (inlink->format) {
     157           0 :     case AV_SAMPLE_FMT_FLT:  s->filter = filter_flt;  break;
     158           0 :     case AV_SAMPLE_FMT_DBL:  s->filter = filter_dbl;  break;
     159           0 :     case AV_SAMPLE_FMT_FLTP: s->filter = filter_fltp; break;
     160           0 :     case AV_SAMPLE_FMT_DBLP: s->filter = filter_dblp; break;
     161             :     }
     162             : 
     163           0 :     return 0;
     164             : }
     165             : 
     166           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     167             : {
     168           0 :     AVFilterContext *ctx = inlink->dst;
     169           0 :     AVFilterLink *outlink = ctx->outputs[0];
     170           0 :     AudioContrastContext *s = ctx->priv;
     171             :     AVFrame *out;
     172             : 
     173           0 :     if (av_frame_is_writable(in)) {
     174           0 :         out = in;
     175             :     } else {
     176           0 :         out = ff_get_audio_buffer(inlink, in->nb_samples);
     177           0 :         if (!out) {
     178           0 :             av_frame_free(&in);
     179           0 :             return AVERROR(ENOMEM);
     180             :         }
     181           0 :         av_frame_copy_props(out, in);
     182             :     }
     183             : 
     184           0 :     s->filter((void **)out->extended_data, (const void **)in->extended_data,
     185           0 :               in->nb_samples, in->channels, s->contrast / 750);
     186             : 
     187           0 :     if (out != in)
     188           0 :         av_frame_free(&in);
     189             : 
     190           0 :     return ff_filter_frame(outlink, out);
     191             : }
     192             : 
     193             : static const AVFilterPad inputs[] = {
     194             :     {
     195             :         .name         = "default",
     196             :         .type         = AVMEDIA_TYPE_AUDIO,
     197             :         .filter_frame = filter_frame,
     198             :         .config_props = config_input,
     199             :     },
     200             :     { NULL }
     201             : };
     202             : 
     203             : static const AVFilterPad outputs[] = {
     204             :     {
     205             :         .name = "default",
     206             :         .type = AVMEDIA_TYPE_AUDIO,
     207             :     },
     208             :     { NULL }
     209             : };
     210             : 
     211             : AVFilter ff_af_acontrast = {
     212             :     .name           = "acontrast",
     213             :     .description    = NULL_IF_CONFIG_SMALL("Simple audio dynamic range compression/expansion filter."),
     214             :     .query_formats  = query_formats,
     215             :     .priv_size      = sizeof(AudioContrastContext),
     216             :     .priv_class     = &acontrast_class,
     217             :     .inputs         = inputs,
     218             :     .outputs        = outputs,
     219             : };

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