LCOV - code coverage report
Current view: top level - src/libavfilter - af_stereowiden.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 51 0.0 %
Date: 2017-07-21 15:41:20 Functions: 0 4 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (C) 2012 VLC authors and VideoLAN
       3             :  * Author : Sukrit Sangwan < sukritsangwan at gmail dot com >
       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 StereoWidenContext {
      29             :     const AVClass *class;
      30             : 
      31             :     float delay;
      32             :     float feedback;
      33             :     float crossfeed;
      34             :     float drymix;
      35             : 
      36             :     float *buffer;
      37             :     float *cur;
      38             :     int length;
      39             : } StereoWidenContext;
      40             : 
      41             : #define OFFSET(x) offsetof(StereoWidenContext, x)
      42             : #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      43             : 
      44             : static const AVOption stereowiden_options[] = {
      45             :     { "delay",     "set delay time",    OFFSET(delay),     AV_OPT_TYPE_FLOAT, {.dbl=20}, 1, 100, A },
      46             :     { "feedback",  "set feedback gain", OFFSET(feedback),  AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.9, A },
      47             :     { "crossfeed", "set cross feed",    OFFSET(crossfeed), AV_OPT_TYPE_FLOAT, {.dbl=.3}, 0, 0.8, A },
      48             :     { "drymix",    "set dry-mix",       OFFSET(drymix),    AV_OPT_TYPE_FLOAT, {.dbl=.8}, 0, 1.0, A },
      49             :     { NULL }
      50             : };
      51             : 
      52             : AVFILTER_DEFINE_CLASS(stereowiden);
      53             : 
      54           0 : static int query_formats(AVFilterContext *ctx)
      55             : {
      56           0 :     AVFilterFormats *formats = NULL;
      57           0 :     AVFilterChannelLayouts *layout = NULL;
      58             :     int ret;
      59             : 
      60           0 :     if ((ret = ff_add_format                 (&formats, AV_SAMPLE_FMT_FLT  )) < 0 ||
      61           0 :         (ret = ff_set_common_formats         (ctx     , formats            )) < 0 ||
      62           0 :         (ret = ff_add_channel_layout         (&layout , AV_CH_LAYOUT_STEREO)) < 0 ||
      63           0 :         (ret = ff_set_common_channel_layouts (ctx     , layout             )) < 0)
      64           0 :         return ret;
      65             : 
      66           0 :     formats = ff_all_samplerates();
      67           0 :     return ff_set_common_samplerates(ctx, formats);
      68             : }
      69             : 
      70           0 : static int config_input(AVFilterLink *inlink)
      71             : {
      72           0 :     AVFilterContext *ctx = inlink->dst;
      73           0 :     StereoWidenContext *s = ctx->priv;
      74             : 
      75           0 :     s->length = s->delay * inlink->sample_rate / 1000;
      76           0 :     s->length *= 2;
      77           0 :     s->buffer = av_calloc(s->length, sizeof(*s->buffer));
      78           0 :     if (!s->buffer)
      79           0 :         return AVERROR(ENOMEM);
      80           0 :     s->cur = s->buffer;
      81             : 
      82           0 :     return 0;
      83             : }
      84             : 
      85           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
      86             : {
      87           0 :     AVFilterContext *ctx = inlink->dst;
      88           0 :     AVFilterLink *outlink = ctx->outputs[0];
      89           0 :     StereoWidenContext *s = ctx->priv;
      90           0 :     const float *src = (const float *)in->data[0];
      91           0 :     const float drymix = s->drymix;
      92           0 :     const float crossfeed = s->crossfeed;
      93           0 :     const float feedback = s->feedback;
      94             :     AVFrame *out;
      95             :     float *dst;
      96             :     int n;
      97             : 
      98           0 :     if (av_frame_is_writable(in)) {
      99           0 :         out = in;
     100             :     } else {
     101           0 :         out = ff_get_audio_buffer(inlink, in->nb_samples);
     102           0 :         if (!out) {
     103           0 :             av_frame_free(&in);
     104           0 :             return AVERROR(ENOMEM);
     105             :         }
     106           0 :         av_frame_copy_props(out, in);
     107             :     }
     108           0 :     dst = (float *)out->data[0];
     109             : 
     110           0 :     for (n = 0; n < in->nb_samples; n++, src += 2, dst += 2, s->cur += 2) {
     111           0 :         const float left = src[0], right = src[1];
     112             : 
     113           0 :         if (s->cur == s->buffer + s->length)
     114           0 :             s->cur = s->buffer;
     115             : 
     116           0 :         dst[0] = drymix * left - crossfeed * right - feedback * s->cur[1];
     117           0 :         dst[1] = drymix * right - crossfeed * left - feedback * s->cur[0];
     118             : 
     119           0 :         s->cur[0] = left;
     120           0 :         s->cur[1] = right;
     121             :     }
     122             : 
     123           0 :     if (out != in)
     124           0 :         av_frame_free(&in);
     125           0 :     return ff_filter_frame(outlink, out);
     126             : }
     127             : 
     128           0 : static av_cold void uninit(AVFilterContext *ctx)
     129             : {
     130           0 :     StereoWidenContext *s = ctx->priv;
     131             : 
     132           0 :     av_freep(&s->buffer);
     133           0 : }
     134             : 
     135             : static const AVFilterPad inputs[] = {
     136             :     {
     137             :         .name         = "default",
     138             :         .type         = AVMEDIA_TYPE_AUDIO,
     139             :         .filter_frame = filter_frame,
     140             :         .config_props = config_input,
     141             :     },
     142             :     { NULL }
     143             : };
     144             : 
     145             : static const AVFilterPad outputs[] = {
     146             :     {
     147             :         .name = "default",
     148             :         .type = AVMEDIA_TYPE_AUDIO,
     149             :     },
     150             :     { NULL }
     151             : };
     152             : 
     153             : AVFilter ff_af_stereowiden = {
     154             :     .name           = "stereowiden",
     155             :     .description    = NULL_IF_CONFIG_SMALL("Apply stereo widening effect."),
     156             :     .query_formats  = query_formats,
     157             :     .priv_size      = sizeof(StereoWidenContext),
     158             :     .priv_class     = &stereowiden_class,
     159             :     .uninit         = uninit,
     160             :     .inputs         = inputs,
     161             :     .outputs        = outputs,
     162             : };

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