/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/opt.h"#include "audio.h"#include "avfilter.h"#include "filters.h" typedef struct ADerivativeContext {    const AVClass *class;    AVFrame *prev;    void (*filter)(void **dst, void **prv, const void **src,                   int nb_samples, int channels);} ADerivativeContext; #define DERIVATIVE(name, type)                                          \static void aderivative_## name ##p(void **d, void **p, const void **s, \                                    int nb_samples, int channels)       \{                                                                       \    int n, c;                                                           \                                                                        \    for (c = 0; c < channels; c++) {                                    \        const type *src = s[c];                                         \        type *dst = d[c];                                               \        type *prv = p[c];                                               \                                                                        \        for (n = 0; n < nb_samples; n++) {                              \            const type current = src[n];                                \                                                                        \            dst[n] = current - prv[0];                                  \            prv[0] = current;                                           \        }                                                               \    }                                                                   \} DERIVATIVE(flt, float)DERIVATIVE(dbl, double)DERIVATIVE(s16, int16_t)DERIVATIVE(s32, int32_t) #define INTEGRAL(name, type)                                          \static void aintegral_## name ##p(void **d, void **p, const void **s, \                                  int nb_samples, int channels)       \{                                                                     \    int n, c;                                                         \                                                                      \    for (c = 0; c < channels; c++) {                                  \        const type *src = s[c];                                       \        type *dst = d[c];                                             \        type *prv = p[c];                                             \                                                                      \        for (n = 0; n < nb_samples; n++) {                            \            const type current = src[n];                              \                                                                      \            dst[n] = current + prv[0];                                \            prv[0] = dst[n];                                          \        }                                                             \    }                                                                 \} INTEGRAL(flt, float)INTEGRAL(dbl, double) static int config_input(AVFilterLink *inlink){    AVFilterContext *ctx = inlink->dst;    ADerivativeContext *s = ctx->priv;     switch (inlink->format) {    case AV_SAMPLE_FMT_FLTP: s->filter = aderivative_fltp; break;    case AV_SAMPLE_FMT_DBLP: s->filter = aderivative_dblp; break;    case AV_SAMPLE_FMT_S32P: s->filter = aderivative_s32p; break;    case AV_SAMPLE_FMT_S16P: s->filter = aderivative_s16p; break;    }     if (strcmp(ctx->filter->name, "aintegral"))        return 0;     switch (inlink->format) {    case AV_SAMPLE_FMT_FLTP: s->filter = aintegral_fltp; break;    case AV_SAMPLE_FMT_DBLP: s->filter = aintegral_dblp; break;    }     return 0;} static int filter_frame(AVFilterLink *inlink, AVFrame *in){    AVFilterContext *ctx = inlink->dst;    ADerivativeContext *s = ctx->priv;    AVFilterLink *outlink = ctx->outputs[0];    AVFrame *out;     if (ctx->is_disabled) {        if (s->prev)            av_samples_set_silence(s->prev->extended_data, 0, 1,                                   s->prev->ch_layout.nb_channels,                                   s->prev->format);         return ff_filter_frame(outlink, in);    }     out = ff_get_audio_buffer(outlink, in->nb_samples);    if (!out) {        av_frame_free(&in);        return AVERROR(ENOMEM);    }    av_frame_copy_props(out, in);     if (!s->prev) {        s->prev = ff_get_audio_buffer(inlink, 1);        if (!s->prev) {            av_frame_free(&in);            av_frame_free(&out);            return AVERROR(ENOMEM);        }    }     s->filter((void **)out->extended_data, (void **)s->prev->extended_data, (const void **)in->extended_data,              in->nb_samples, in->ch_layout.nb_channels);     av_frame_free(&in);    return ff_filter_frame(outlink, out);} static av_cold void uninit(AVFilterContext *ctx){    ADerivativeContext *s = ctx->priv;     av_frame_free(&s->prev);} static const AVFilterPad aderivative_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = filter_frame,        .config_props = config_input,    },}; static const AVOption aderivative_options[] = {    { NULL }}; AVFILTER_DEFINE_CLASS_EXT(aderivative, "aderivative/aintegral", aderivative_options); const FFFilter ff_af_aderivative = {    .p.name        = "aderivative",    .p.description = NULL_IF_CONFIG_SMALL("Compute derivative of input audio."),    .p.priv_class  = &aderivative_class,    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,    .priv_size     = sizeof(ADerivativeContext),    .uninit        = uninit,    FILTER_INPUTS(aderivative_inputs),    FILTER_OUTPUTS(ff_audio_default_filterpad),    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_FLTP,                      AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_DBLP),}; const FFFilter ff_af_aintegral = {    .p.name        = "aintegral",    .p.description = NULL_IF_CONFIG_SMALL("Compute integral of input audio."),    .p.priv_class  = &aderivative_class,    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,    .priv_size     = sizeof(ADerivativeContext),    .uninit        = uninit,    FILTER_INPUTS(aderivative_inputs),    FILTER_OUTPUTS(ff_audio_default_filterpad),    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),};