git.sesse.net Git - ffmpeg/blob - libavfilter/af_adelay.c

   1 /*
   2  * Copyright (c) 2013 Paul B Mahol
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "libavutil/avstring.h"
  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 ChanDelay {
  29     int delay;
  30     unsigned delay_index;
  31     unsigned index;
  32     uint8_t *samples;
  33 } ChanDelay;
  34
  35 typedef struct AudioDelayContext {
  36     const AVClass *class;
  37     char *delays;
  38     ChanDelay *chandelay;
  39     int nb_delays;
  40     int block_align;
  41     unsigned max_delay;
  42     int64_t next_pts;
  43
  44     void (*delay_channel)(ChanDelay *d, int nb_samples,
  45                           const uint8_t *src, uint8_t *dst);
  46 } AudioDelayContext;
  47
  48 #define OFFSET(x) offsetof(AudioDelayContext, x)
  49 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  50
  51 static const AVOption adelay_options[] = {
  52     { "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
  53     { NULL }
  54 };
  55
  56 AVFILTER_DEFINE_CLASS(adelay);
  57
  58 static int query_formats(AVFilterContext *ctx)
  59 {
  60     AVFilterChannelLayouts *layouts;
  61     AVFilterFormats *formats;
  62     static const enum AVSampleFormat sample_fmts[] = {
  63         AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P,
  64         AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP,
  65         AV_SAMPLE_FMT_NONE
  66     };
  67
  68     layouts = ff_all_channel_layouts();
  69     if (!layouts)
  70         return AVERROR(ENOMEM);
  71     ff_set_common_channel_layouts(ctx, layouts);
  72
  73     formats = ff_make_format_list(sample_fmts);
  74     if (!formats)
  75         return AVERROR(ENOMEM);
  76     ff_set_common_formats(ctx, formats);
  77
  78     formats = ff_all_samplerates();
  79     if (!formats)
  80         return AVERROR(ENOMEM);
  81     ff_set_common_samplerates(ctx, formats);
  82
  83     return 0;
  84 }
  85
  86 #define DELAY(name, type, fill)                                           \
  87 static void delay_channel_## name ##p(ChanDelay *d, int nb_samples,       \
  88                                       const uint8_t *ssrc, uint8_t *ddst) \
  89 {                                                                         \
  90     const type *src = (type *)ssrc;                                       \
  91     type *dst = (type *)ddst;                                             \
  92     type *samples = (type *)d->samples;                                   \
  93                                                                           \
  94     while (nb_samples) {                                                  \
  95         if (d->delay_index < d->delay) {                                  \
  96             const int len = FFMIN(nb_samples, d->delay - d->delay_index); \
  97                                                                           \
  98             memcpy(&samples[d->delay_index], src, len * sizeof(type));    \
  99             memset(dst, fill, len * sizeof(type));                        \
 100             d->delay_index += len;                                        \
 101             src += len;                                                   \
 102             dst += len;                                                   \
 103             nb_samples -= len;                                            \
 104         } else {                                                          \
 105             *dst = samples[d->index];                                     \
 106             samples[d->index] = *src;                                     \
 107             nb_samples--;                                                 \
 108             d->index++;                                                   \
 109             src++, dst++;                                                 \
 110             d->index = d->index >= d->delay ? 0 : d->index;               \
 111         }                                                                 \
 112     }                                                                     \
 113 }
 114
 115 DELAY(u8,  uint8_t, 0x80)
 116 DELAY(s16, int16_t, 0)
 117 DELAY(s32, int32_t, 0)
 118 DELAY(flt, float,   0)
 119 DELAY(dbl, double,  0)
 120
 121 static int config_input(AVFilterLink *inlink)
 122 {
 123     AVFilterContext *ctx = inlink->dst;
 124     AudioDelayContext *s = ctx->priv;
 125     char *p, *arg, *saveptr = NULL;
 126     int i;
 127
 128     s->chandelay = av_calloc(inlink->channels, sizeof(*s->chandelay));
 129     if (!s->chandelay)
 130         return AVERROR(ENOMEM);
 131     s->nb_delays = inlink->channels;
 132     s->block_align = av_get_bytes_per_sample(inlink->format);
 133
 134     p = s->delays;
 135     for (i = 0; i < s->nb_delays; i++) {
 136         ChanDelay *d = &s->chandelay[i];
 137         float delay;
 138
 139         if (!(arg = av_strtok(p, "|", &saveptr)))
 140             break;
 141
 142         p = NULL;
 143         sscanf(arg, "%f", &delay);
 144
 145         d->delay = delay * inlink->sample_rate / 1000.0;
 146         if (d->delay < 0) {
 147             av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n");
 148             return AVERROR(EINVAL);
 149         }
 150     }
 151
 152     for (i = 0; i < s->nb_delays; i++) {
 153         ChanDelay *d = &s->chandelay[i];
 154
 155         if (!d->delay)
 156             continue;
 157
 158         d->samples = av_malloc_array(d->delay, s->block_align);
 159         if (!d->samples)
 160             return AVERROR(ENOMEM);
 161
 162         s->max_delay = FFMAX(s->max_delay, d->delay);
 163     }
 164
 165     if (!s->max_delay) {
 166         av_log(ctx, AV_LOG_ERROR, "At least one delay >0 must be specified.\n");
 167         return AVERROR(EINVAL);
 168     }
 169
 170     switch (inlink->format) {
 171     case AV_SAMPLE_FMT_U8P : s->delay_channel = delay_channel_u8p ; break;
 172     case AV_SAMPLE_FMT_S16P: s->delay_channel = delay_channel_s16p; break;
 173     case AV_SAMPLE_FMT_S32P: s->delay_channel = delay_channel_s32p; break;
 174     case AV_SAMPLE_FMT_FLTP: s->delay_channel = delay_channel_fltp; break;
 175     case AV_SAMPLE_FMT_DBLP: s->delay_channel = delay_channel_dblp; break;
 176     }
 177
 178     return 0;
 179 }
 180
 181 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 182 {
 183     AVFilterContext *ctx = inlink->dst;
 184     AudioDelayContext *s = ctx->priv;
 185     AVFrame *out_frame;
 186     int i;
 187
 188     if (ctx->is_disabled || !s->delays)
 189         return ff_filter_frame(ctx->outputs[0], frame);
 190
 191     out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
 192     if (!out_frame)
 193         return AVERROR(ENOMEM);
 194     av_frame_copy_props(out_frame, frame);
 195
 196     for (i = 0; i < s->nb_delays; i++) {
 197         ChanDelay *d = &s->chandelay[i];
 198         const uint8_t *src = frame->extended_data[i];
 199         uint8_t *dst = out_frame->extended_data[i];
 200
 201         if (!d->delay)
 202             memcpy(dst, src, frame->nb_samples * s->block_align);
 203         else
 204             s->delay_channel(d, frame->nb_samples, src, dst);
 205     }
 206
 207     s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
 208     av_frame_free(&frame);
 209     return ff_filter_frame(ctx->outputs[0], out_frame);
 210 }
 211
 212 static int request_frame(AVFilterLink *outlink)
 213 {
 214     AVFilterContext *ctx = outlink->src;
 215     AudioDelayContext *s = ctx->priv;
 216     int ret;
 217
 218     ret = ff_request_frame(ctx->inputs[0]);
 219     if (ret == AVERROR_EOF && !ctx->is_disabled && s->max_delay) {
 220         int nb_samples = FFMIN(s->max_delay, 2048);
 221         AVFrame *frame;
 222
 223         frame = ff_get_audio_buffer(outlink, nb_samples);
 224         if (!frame)
 225             return AVERROR(ENOMEM);
 226         s->max_delay -= nb_samples;
 227
 228         av_samples_set_silence(frame->extended_data, 0,
 229                                frame->nb_samples,
 230                                outlink->channels,
 231                                frame->format);
 232
 233         frame->pts = s->next_pts;
 234         if (s->next_pts != AV_NOPTS_VALUE)
 235             s->next_pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
 236
 237         ret = filter_frame(ctx->inputs[0], frame);
 238     }
 239
 240     return ret;
 241 }
 242
 243 static av_cold void uninit(AVFilterContext *ctx)
 244 {
 245     AudioDelayContext *s = ctx->priv;
 246     int i;
 247
 248     for (i = 0; i < s->nb_delays; i++)
 249         av_free(s->chandelay[i].samples);
 250     av_freep(&s->chandelay);
 251 }
 252
 253 static const AVFilterPad adelay_inputs[] = {
 254     {
 255         .name         = "default",
 256         .type         = AVMEDIA_TYPE_AUDIO,
 257         .config_props = config_input,
 258         .filter_frame = filter_frame,
 259     },
 260     { NULL }
 261 };
 262
 263 static const AVFilterPad adelay_outputs[] = {
 264     {
 265         .name          = "default",
 266         .request_frame = request_frame,
 267         .type          = AVMEDIA_TYPE_AUDIO,
 268     },
 269     { NULL }
 270 };
 271
 272 AVFilter ff_af_adelay = {
 273     .name          = "adelay",
 274     .description   = NULL_IF_CONFIG_SMALL("Delay one or more audio channels."),
 275     .query_formats = query_formats,
 276     .priv_size     = sizeof(AudioDelayContext),
 277     .priv_class    = &adelay_class,
 278     .uninit        = uninit,
 279     .inputs        = adelay_inputs,
 280     .outputs       = adelay_outputs,
 281     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 282 };