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avfilter: add aderivative and aintegral filter
Signed-off-by: Paul B Mahol <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,207 @@ | ||
| /* | ||
| * 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 "audio.h" | ||
| #include "avfilter.h" | ||
| #include "internal.h" | ||
|
|
||
| typedef struct ADerivativeContext { | ||
| const AVClass *class; | ||
| AVFrame *prev; | ||
| void (*filter)(void **dst, void **prv, const void **src, | ||
| int nb_samples, int channels); | ||
| } ADerivativeContext; | ||
|
|
||
| static int query_formats(AVFilterContext *ctx) | ||
| { | ||
| AVFilterFormats *formats = NULL; | ||
| AVFilterChannelLayouts *layouts = NULL; | ||
| static const enum AVSampleFormat derivative_sample_fmts[] = { | ||
| AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_FLTP, | ||
| AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_DBLP, | ||
| AV_SAMPLE_FMT_NONE | ||
| }; | ||
| static const enum AVSampleFormat integral_sample_fmts[] = { | ||
| AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP, | ||
| AV_SAMPLE_FMT_NONE | ||
| }; | ||
| int ret; | ||
|
|
||
| formats = ff_make_format_list(strcmp(ctx->filter->name, "aintegral") ? | ||
| derivative_sample_fmts : integral_sample_fmts); | ||
| if (!formats) | ||
| return AVERROR(ENOMEM); | ||
| ret = ff_set_common_formats(ctx, formats); | ||
| if (ret < 0) | ||
| return ret; | ||
|
|
||
| layouts = ff_all_channel_counts(); | ||
| if (!layouts) | ||
| return AVERROR(ENOMEM); | ||
|
|
||
| ret = ff_set_common_channel_layouts(ctx, layouts); | ||
| if (ret < 0) | ||
| return ret; | ||
|
|
||
| formats = ff_all_samplerates(); | ||
| return ff_set_common_samplerates(ctx, formats); | ||
| } | ||
|
|
||
| #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 = 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); | ||
| return AVERROR(ENOMEM); | ||
| } | ||
| } | ||
|
|
||
| s->filter((void **)out->extended_data, (void **)s->prev->extended_data, (const void **)in->extended_data, | ||
| in->nb_samples, in->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, | ||
| }, | ||
| { NULL } | ||
| }; | ||
|
|
||
| static const AVFilterPad aderivative_outputs[] = { | ||
| { | ||
| .name = "default", | ||
| .type = AVMEDIA_TYPE_AUDIO, | ||
| }, | ||
| { NULL } | ||
| }; | ||
|
|
||
| AVFilter ff_af_aderivative = { | ||
| .name = "aderivative", | ||
| .description = NULL_IF_CONFIG_SMALL("Compute derivative of input audio."), | ||
| .query_formats = query_formats, | ||
| .priv_size = sizeof(ADerivativeContext), | ||
| .uninit = uninit, | ||
| .inputs = aderivative_inputs, | ||
| .outputs = aderivative_outputs, | ||
| }; | ||
|
|
||
| AVFilter ff_af_aintegral = { | ||
| .name = "aintegral", | ||
| .description = NULL_IF_CONFIG_SMALL("Compute integral of input audio."), | ||
| .query_formats = query_formats, | ||
| .priv_size = sizeof(ADerivativeContext), | ||
| .uninit = uninit, | ||
| .inputs = aderivative_inputs, | ||
| .outputs = aderivative_outputs, | ||
| }; |
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