avfilter/showspectrum: add blackman window.
[ffmpeg.git] / 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 };