LCOV - code coverage report
Current view: top level - src/libavfilter - af_compensationdelay.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 66 0.0 %
Date: 2017-07-24 01:16:58 Functions: 0 4 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Vladimir Sadovnikov and others
       3             :  * Copyright (c) 2015 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/opt.h"
      23             : #include "libavutil/samplefmt.h"
      24             : #include "avfilter.h"
      25             : #include "audio.h"
      26             : #include "internal.h"
      27             : 
      28             : typedef struct CompensationDelayContext {
      29             :     const AVClass *class;
      30             :     int distance_mm;
      31             :     int distance_cm;
      32             :     int distance_m;
      33             :     double dry, wet;
      34             :     int temp;
      35             : 
      36             :     unsigned delay;
      37             :     unsigned w_ptr;
      38             :     unsigned buf_size;
      39             :     AVFrame *delay_frame;
      40             : } CompensationDelayContext;
      41             : 
      42             : #define OFFSET(x) offsetof(CompensationDelayContext, x)
      43             : #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
      44             : 
      45             : static const AVOption compensationdelay_options[] = {
      46             :     { "mm",   "set mm distance",    OFFSET(distance_mm), AV_OPT_TYPE_INT,    {.i64=0},    0,  10, A },
      47             :     { "cm",   "set cm distance",    OFFSET(distance_cm), AV_OPT_TYPE_INT,    {.i64=0},    0, 100, A },
      48             :     { "m",    "set meter distance", OFFSET(distance_m),  AV_OPT_TYPE_INT,    {.i64=0},    0, 100, A },
      49             :     { "dry",  "set dry amount",     OFFSET(dry),         AV_OPT_TYPE_DOUBLE, {.dbl=0},    0,   1, A },
      50             :     { "wet",  "set wet amount",     OFFSET(wet),         AV_OPT_TYPE_DOUBLE, {.dbl=1},    0,   1, A },
      51             :     { "temp", "set temperature °C", OFFSET(temp),        AV_OPT_TYPE_INT,    {.i64=20}, -50,  50, A },
      52             :     { NULL }
      53             : };
      54             : 
      55             : AVFILTER_DEFINE_CLASS(compensationdelay);
      56             : 
      57             : // The maximum distance for options
      58             : #define COMP_DELAY_MAX_DISTANCE            (100.0 * 100.0 + 100.0 * 1.0 + 1.0)
      59             : // The actual speed of sound in normal conditions
      60             : #define COMP_DELAY_SOUND_SPEED_KM_H(temp)  1.85325 * (643.95 * sqrt(((temp + 273.15) / 273.15)))
      61             : #define COMP_DELAY_SOUND_SPEED_CM_S(temp)  (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * 60.0) /* s/h */)
      62             : #define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / COMP_DELAY_SOUND_SPEED_CM_S(temp))
      63             : // The maximum delay may be reached by this filter
      64             : #define COMP_DELAY_MAX_DELAY               (COMP_DELAY_MAX_DISTANCE * COMP_DELAY_SOUND_FRONT_DELAY(50))
      65             : 
      66           0 : static int query_formats(AVFilterContext *ctx)
      67             : {
      68             :     AVFilterChannelLayouts *layouts;
      69             :     AVFilterFormats *formats;
      70             :     static const enum AVSampleFormat sample_fmts[] = {
      71             :         AV_SAMPLE_FMT_DBLP,
      72             :         AV_SAMPLE_FMT_NONE
      73             :     };
      74             :     int ret;
      75             : 
      76           0 :     layouts = ff_all_channel_counts();
      77           0 :     if (!layouts)
      78           0 :         return AVERROR(ENOMEM);
      79           0 :     ret = ff_set_common_channel_layouts(ctx, layouts);
      80           0 :     if (ret < 0)
      81           0 :         return ret;
      82             : 
      83           0 :     formats = ff_make_format_list(sample_fmts);
      84           0 :     if (!formats)
      85           0 :         return AVERROR(ENOMEM);
      86           0 :     ret = ff_set_common_formats(ctx, formats);
      87           0 :     if (ret < 0)
      88           0 :         return ret;
      89             : 
      90           0 :     formats = ff_all_samplerates();
      91           0 :     if (!formats)
      92           0 :         return AVERROR(ENOMEM);
      93           0 :     return ff_set_common_samplerates(ctx, formats);
      94             : }
      95             : 
      96           0 : static int config_input(AVFilterLink *inlink)
      97             : {
      98           0 :     AVFilterContext *ctx = inlink->dst;
      99           0 :     CompensationDelayContext *s = ctx->priv;
     100           0 :     unsigned min_size, new_size = 1;
     101             : 
     102           0 :     s->delay = (s->distance_m * 100. + s->distance_cm * 1. + s->distance_mm * .1) *
     103           0 :                COMP_DELAY_SOUND_FRONT_DELAY(s->temp) * inlink->sample_rate;
     104           0 :     min_size = inlink->sample_rate * COMP_DELAY_MAX_DELAY;
     105             : 
     106           0 :     while (new_size < min_size)
     107           0 :         new_size <<= 1;
     108             : 
     109           0 :     s->delay_frame = av_frame_alloc();
     110           0 :     if (!s->delay_frame)
     111           0 :         return AVERROR(ENOMEM);
     112             : 
     113           0 :     s->buf_size                    = new_size;
     114           0 :     s->delay_frame->format         = inlink->format;
     115           0 :     s->delay_frame->nb_samples     = new_size;
     116           0 :     s->delay_frame->channel_layout = inlink->channel_layout;
     117             : 
     118           0 :     return av_frame_get_buffer(s->delay_frame, 32);
     119             : }
     120             : 
     121           0 : static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     122             : {
     123           0 :     AVFilterContext *ctx = inlink->dst;
     124           0 :     CompensationDelayContext *s = ctx->priv;
     125           0 :     const unsigned b_mask = s->buf_size - 1;
     126           0 :     const unsigned buf_size = s->buf_size;
     127           0 :     const unsigned delay = s->delay;
     128           0 :     const double dry = s->dry;
     129           0 :     const double wet = s->wet;
     130             :     unsigned r_ptr, w_ptr;
     131             :     AVFrame *out;
     132             :     int n, ch;
     133             : 
     134           0 :     out = ff_get_audio_buffer(inlink, in->nb_samples);
     135           0 :     if (!out) {
     136           0 :         av_frame_free(&in);
     137           0 :         return AVERROR(ENOMEM);
     138             :     }
     139           0 :     av_frame_copy_props(out, in);
     140             : 
     141           0 :     for (ch = 0; ch < inlink->channels; ch++) {
     142           0 :         const double *src = (const double *)in->extended_data[ch];
     143           0 :         double *dst = (double *)out->extended_data[ch];
     144           0 :         double *buffer = (double *)s->delay_frame->extended_data[ch];
     145             : 
     146           0 :         w_ptr =  s->w_ptr;
     147           0 :         r_ptr = (w_ptr + buf_size - delay) & b_mask;
     148             : 
     149           0 :         for (n = 0; n < in->nb_samples; n++) {
     150           0 :             const double sample = src[n];
     151             : 
     152           0 :             buffer[w_ptr] = sample;
     153           0 :             dst[n] = dry * sample + wet * buffer[r_ptr];
     154           0 :             w_ptr = (w_ptr + 1) & b_mask;
     155           0 :             r_ptr = (r_ptr + 1) & b_mask;
     156             :         }
     157             :     }
     158           0 :     s->w_ptr = w_ptr;
     159             : 
     160           0 :     av_frame_free(&in);
     161           0 :     return ff_filter_frame(ctx->outputs[0], out);
     162             : }
     163             : 
     164           0 : static av_cold void uninit(AVFilterContext *ctx)
     165             : {
     166           0 :     CompensationDelayContext *s = ctx->priv;
     167             : 
     168           0 :     av_frame_free(&s->delay_frame);
     169           0 : }
     170             : 
     171             : static const AVFilterPad compensationdelay_inputs[] = {
     172             :     {
     173             :         .name         = "default",
     174             :         .type         = AVMEDIA_TYPE_AUDIO,
     175             :         .config_props = config_input,
     176             :         .filter_frame = filter_frame,
     177             :     },
     178             :     { NULL }
     179             : };
     180             : 
     181             : static const AVFilterPad compensationdelay_outputs[] = {
     182             :     {
     183             :         .name = "default",
     184             :         .type = AVMEDIA_TYPE_AUDIO,
     185             :     },
     186             :     { NULL }
     187             : };
     188             : 
     189             : AVFilter ff_af_compensationdelay = {
     190             :     .name          = "compensationdelay",
     191             :     .description   = NULL_IF_CONFIG_SMALL("Audio Compensation Delay Line."),
     192             :     .query_formats = query_formats,
     193             :     .priv_size     = sizeof(CompensationDelayContext),
     194             :     .priv_class    = &compensationdelay_class,
     195             :     .uninit        = uninit,
     196             :     .inputs        = compensationdelay_inputs,
     197             :     .outputs       = compensationdelay_outputs,
     198             : };

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