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
  22 #include "libavutil/avstring.h"
  23 #include "libavutil/opt.h"
  24 #include "libavutil/samplefmt.h"
  25 #include "avfilter.h"
  26 #include "audio.h"
  27 #include "internal.h"
  28
  29 typedef struct ChanDelay {
  30     int delay;
  31     unsigned delay_index;
  32     unsigned index;
  33     uint8_t *samples;
  34 } ChanDelay;
  35
  36 typedef struct AudioDelayContext {
  37     const AVClass *class;
  38     char *delays;
  39     ChanDelay *chandelay;
  40     int nb_delays;
  41     int block_align;
  42     unsigned max_delay;
  43     int64_t next_pts;
  44
  45     void (*delay_channel)(ChanDelay *d, int nb_samples,
  46                           const uint8_t *src, uint8_t *dst);
  47 } AudioDelayContext;
  48
  49 #define OFFSET(x) offsetof(AudioDelayContext, x)
  50 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  51
  52 static const AVOption adelay_options[] = {
  53     { "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
  54     { NULL }
  55 };
  56
  57 AVFILTER_DEFINE_CLASS(adelay);
  58
  59 static int query_formats(AVFilterContext *ctx)
  60 {
  61     AVFilterChannelLayouts *layouts;
  62     AVFilterFormats *formats;
  63     static const enum AVSampleFormat sample_fmts[] = {
  64         AV_SAMPLE_FMT_U8P, AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_S32P,
  65         AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP,
  66         AV_SAMPLE_FMT_NONE
  67     };
  68
  69     layouts = ff_all_channel_layouts();
  70     if (!layouts)
  71         return AVERROR(ENOMEM);
  72     ff_set_common_channel_layouts(ctx, layouts);
  73
  74     formats = ff_make_format_list(sample_fmts);
  75     if (!formats)
  76         return AVERROR(ENOMEM);
  77     ff_set_common_formats(ctx, formats);
  78
  79     formats = ff_all_samplerates();
  80     if (!formats)
  81         return AVERROR(ENOMEM);
  82     ff_set_common_samplerates(ctx, formats);
  83
  84     return 0;
  85 }
  86
  87 #define DELAY(name, type, fill)                                           \
  88 static void delay_channel_## name ##p(ChanDelay *d, int nb_samples,       \
  89                                       const uint8_t *ssrc, uint8_t *ddst) \
  90 {                                                                         \
  91     const type *src = (type *)ssrc;                                       \
  92     type *dst = (type *)ddst;                                             \
  93     type *samples = (type *)d->samples;                                   \
  94                                                                           \
  95     while (nb_samples) {                                                  \
  96         if (d->delay_index < d->delay) {                                  \
  97             const int len = FFMIN(nb_samples, d->delay - d->delay_index); \
  98                                                                           \
  99             memcpy(&samples[d->delay_index], src, len * sizeof(type));    \
 100             memset(dst, fill, len * sizeof(type));                        \
 101             d->delay_index += len;                                        \
 102             src += len;                                                   \
 103             dst += len;                                                   \
 104             nb_samples -= len;                                            \
 105         } else {                                                          \
 106             *dst = samples[d->index];                                     \
 107             samples[d->index] = *src;                                     \
 108             nb_samples--;                                                 \
 109             d->index++;                                                   \
 110             src++, dst++;                                                 \
 111             d->index = d->index >= d->delay ? 0 : d->index;               \
 112         }                                                                 \
 113     }                                                                     \
 114 }
 115
 116 DELAY(u8,  uint8_t, 0x80)
 117 DELAY(s16, int16_t, 0)
 118 DELAY(s32, int32_t, 0)
 119 DELAY(flt, float,   0)
 120 DELAY(dbl, double,  0)
 121
 122 static int config_input(AVFilterLink *inlink)
 123 {
 124     AVFilterContext *ctx = inlink->dst;
 125     AudioDelayContext *s = ctx->priv;
 126     char *p, *arg, *saveptr = NULL;
 127     int i;
 128
 129     s->chandelay = av_calloc(inlink->channels, sizeof(*s->chandelay));
 130     if (!s->chandelay)
 131         return AVERROR(ENOMEM);
 132     s->nb_delays = inlink->channels;
 133     s->block_align = av_get_bytes_per_sample(inlink->format);
 134
 135     p = s->delays;
 136     for (i = 0; i < s->nb_delays; i++) {
 137         ChanDelay *d = &s->chandelay[i];
 138         float delay;
 139
 140         if (!(arg = av_strtok(p, "|", &saveptr)))
 141             break;
 142
 143         p = NULL;
 144         sscanf(arg, "%f", &delay);
 145
 146         d->delay = delay * inlink->sample_rate / 1000.0;
 147         if (d->delay < 0) {
 148             av_log(ctx, AV_LOG_ERROR, "Delay must be non negative number.\n");
 149             return AVERROR(EINVAL);
 150         }
 151     }
 152
 153     for (i = 0; i < s->nb_delays; i++) {
 154         ChanDelay *d = &s->chandelay[i];
 155
 156         if (!d->delay)
 157             continue;
 158
 159         d->samples = av_malloc_array(d->delay, s->block_align);
 160         if (!d->samples)
 161             return AVERROR(ENOMEM);
 162
 163         s->max_delay = FFMAX(s->max_delay, d->delay);
 164     }
 165
 166     if (!s->max_delay) {
 167         av_log(ctx, AV_LOG_ERROR, "At least one delay >0 must be specified.\n");
 168         return AVERROR(EINVAL);
 169     }
 170
 171     switch (inlink->format) {
 172     case AV_SAMPLE_FMT_U8P : s->delay_channel = delay_channel_u8p ; break;
 173     case AV_SAMPLE_FMT_S16P: s->delay_channel = delay_channel_s16p; break;
 174     case AV_SAMPLE_FMT_S32P: s->delay_channel = delay_channel_s32p; break;
 175     case AV_SAMPLE_FMT_FLTP: s->delay_channel = delay_channel_fltp; break;
 176     case AV_SAMPLE_FMT_DBLP: s->delay_channel = delay_channel_dblp; break;
 177     }
 178
 179     return 0;
 180 }
 181
 182 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
 183 {
 184     AVFilterContext *ctx = inlink->dst;
 185     AudioDelayContext *s = ctx->priv;
 186     AVFrame *out_frame;
 187     int i;
 188
 189     if (ctx->is_disabled || !s->delays)
 190         return ff_filter_frame(ctx->outputs[0], frame);
 191
 192     out_frame = ff_get_audio_buffer(inlink, frame->nb_samples);
 193     if (!out_frame)
 194         return AVERROR(ENOMEM);
 195     av_frame_copy_props(out_frame, frame);
 196
 197     for (i = 0; i < s->nb_delays; i++) {
 198         ChanDelay *d = &s->chandelay[i];
 199         const uint8_t *src = frame->extended_data[i];
 200         uint8_t *dst = out_frame->extended_data[i];
 201
 202         if (!d->delay)
 203             memcpy(dst, src, frame->nb_samples * s->block_align);
 204         else
 205             s->delay_channel(d, frame->nb_samples, src, dst);
 206     }
 207
 208     s->next_pts = frame->pts + av_rescale_q(frame->nb_samples, (AVRational){1, inlink->sample_rate}, inlink->time_base);
 209     av_frame_free(&frame);
 210     return ff_filter_frame(ctx->outputs[0], out_frame);
 211 }
 212
 213 static int request_frame(AVFilterLink *outlink)
 214 {
 215     AVFilterContext *ctx = outlink->src;
 216     AudioDelayContext *s = ctx->priv;
 217     int ret;
 218
 219     ret = ff_request_frame(ctx->inputs[0]);
 220     if (ret == AVERROR_EOF && !ctx->is_disabled && s->max_delay) {
 221         int nb_samples = FFMIN(s->max_delay, 2048);
 222         AVFrame *frame;
 223
 224         frame = ff_get_audio_buffer(outlink, nb_samples);
 225         if (!frame)
 226             return AVERROR(ENOMEM);
 227         s->max_delay -= nb_samples;
 228
 229         av_samples_set_silence(frame->extended_data, 0,
 230                                frame->nb_samples,
 231                                outlink->channels,
 232                                frame->format);
 233
 234         frame->pts = s->next_pts;
 235         if (s->next_pts != AV_NOPTS_VALUE)
 236             s->next_pts += av_rescale_q(nb_samples, (AVRational){1, outlink->sample_rate}, outlink->time_base);
 237
 238         ret = filter_frame(ctx->inputs[0], frame);
 239     }
 240
 241     return ret;
 242 }
 243
 244 static av_cold void uninit(AVFilterContext *ctx)
 245 {
 246     AudioDelayContext *s = ctx->priv;
 247     int i;
 248
 249     for (i = 0; i < s->nb_delays; i++)
 250         av_free(s->chandelay[i].samples);
 251     av_freep(&s->chandelay);
 252 }
 253
 254 static const AVFilterPad adelay_inputs[] = {
 255     {
 256         .name         = "default",
 257         .type         = AVMEDIA_TYPE_AUDIO,
 258         .config_props = config_input,
 259         .filter_frame = filter_frame,
 260     },
 261     { NULL }
 262 };
 263
 264 static const AVFilterPad adelay_outputs[] = {
 265     {
 266         .name          = "default",
 267         .request_frame = request_frame,
 268         .type          = AVMEDIA_TYPE_AUDIO,
 269     },
 270     { NULL }
 271 };
 272
 273 AVFilter ff_af_adelay = {
 274     .name          = "adelay",
 275     .description   = NULL_IF_CONFIG_SMALL("Delay one or more audio channels."),
 276     .query_formats = query_formats,
 277     .priv_size     = sizeof(AudioDelayContext),
 278     .priv_class    = &adelay_class,
 279     .uninit        = uninit,
 280     .inputs        = adelay_inputs,
 281     .outputs       = adelay_outputs,
 282     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 283 };