2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 typedef struct ADerivativeContext {
26 void (*filter)(void **dst, void **prv, const void **src,
27 int nb_samples, int channels);
30 static int query_formats(AVFilterContext *ctx)
32 AVFilterFormats *formats = NULL;
33 AVFilterChannelLayouts *layouts = NULL;
34 static const enum AVSampleFormat derivative_sample_fmts[] = {
35 AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_FLTP,
36 AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_DBLP,
39 static const enum AVSampleFormat integral_sample_fmts[] = {
40 AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP,
45 formats = ff_make_format_list(strcmp(ctx->filter->name, "aintegral") ?
46 derivative_sample_fmts : integral_sample_fmts);
48 return AVERROR(ENOMEM);
49 ret = ff_set_common_formats(ctx, formats);
53 layouts = ff_all_channel_counts();
55 return AVERROR(ENOMEM);
57 ret = ff_set_common_channel_layouts(ctx, layouts);
61 formats = ff_all_samplerates();
62 return ff_set_common_samplerates(ctx, formats);
65 #define DERIVATIVE(name, type) \
66 static void aderivative_## name ##p(void **d, void **p, const void **s, \
67 int nb_samples, int channels) \
71 for (c = 0; c < channels; c++) { \
72 const type *src = s[c]; \
76 for (n = 0; n < nb_samples; n++) { \
77 const type current = src[n]; \
79 dst[n] = current - prv[0]; \
85 DERIVATIVE(flt, float)
86 DERIVATIVE(dbl, double)
87 DERIVATIVE(s16, int16_t)
88 DERIVATIVE(s32, int32_t)
90 #define INTEGRAL(name, type) \
91 static void aintegral_## name ##p(void **d, void **p, const void **s, \
92 int nb_samples, int channels) \
96 for (c = 0; c < channels; c++) { \
97 const type *src = s[c]; \
101 for (n = 0; n < nb_samples; n++) { \
102 const type current = src[n]; \
104 dst[n] = current + prv[0]; \
111 INTEGRAL(dbl, double)
113 static int config_input(AVFilterLink *inlink)
115 AVFilterContext *ctx = inlink->dst;
116 ADerivativeContext *s = ctx->priv;
118 switch (inlink->format) {
119 case AV_SAMPLE_FMT_FLTP: s->filter = aderivative_fltp; break;
120 case AV_SAMPLE_FMT_DBLP: s->filter = aderivative_dblp; break;
121 case AV_SAMPLE_FMT_S32P: s->filter = aderivative_s32p; break;
122 case AV_SAMPLE_FMT_S16P: s->filter = aderivative_s16p; break;
125 if (strcmp(ctx->filter->name, "aintegral"))
128 switch (inlink->format) {
129 case AV_SAMPLE_FMT_FLTP: s->filter = aintegral_fltp; break;
130 case AV_SAMPLE_FMT_DBLP: s->filter = aintegral_dblp; break;
136 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
138 AVFilterContext *ctx = inlink->dst;
139 ADerivativeContext *s = ctx->priv;
140 AVFilterLink *outlink = ctx->outputs[0];
141 AVFrame *out = ff_get_audio_buffer(outlink, in->nb_samples);
145 return AVERROR(ENOMEM);
147 av_frame_copy_props(out, in);
150 s->prev = ff_get_audio_buffer(inlink, 1);
153 return AVERROR(ENOMEM);
157 s->filter((void **)out->extended_data, (void **)s->prev->extended_data, (const void **)in->extended_data,
158 in->nb_samples, in->channels);
161 return ff_filter_frame(outlink, out);
164 static av_cold void uninit(AVFilterContext *ctx)
166 ADerivativeContext *s = ctx->priv;
168 av_frame_free(&s->prev);
171 static const AVFilterPad aderivative_inputs[] = {
174 .type = AVMEDIA_TYPE_AUDIO,
175 .filter_frame = filter_frame,
176 .config_props = config_input,
181 static const AVFilterPad aderivative_outputs[] = {
184 .type = AVMEDIA_TYPE_AUDIO,
189 AVFilter ff_af_aderivative = {
190 .name = "aderivative",
191 .description = NULL_IF_CONFIG_SMALL("Compute derivative of input audio."),
192 .query_formats = query_formats,
193 .priv_size = sizeof(ADerivativeContext),
195 .inputs = aderivative_inputs,
196 .outputs = aderivative_outputs,
199 AVFilter ff_af_aintegral = {
201 .description = NULL_IF_CONFIG_SMALL("Compute integral of input audio."),
202 .query_formats = query_formats,
203 .priv_size = sizeof(ADerivativeContext),
205 .inputs = aderivative_inputs,
206 .outputs = aderivative_outputs,