/* * Copyright (c) 2015 Derek Buitenhuis * * 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 "config_components.h" #include "libavutil/opt.h"#include "avfilter.h"#include "formats.h"#include "internal.h"#include "video.h" #define DEFAULT_LENGTH 300 typedef struct ReverseContext {    int nb_frames;    AVFrame **frames;    unsigned int frames_size;    unsigned int pts_size;    int64_t *pts;    int flush_idx;    int64_t nb_samples;} ReverseContext; static av_cold int init(AVFilterContext *ctx){    ReverseContext *s = ctx->priv;     s->pts = av_fast_realloc(NULL, &s->pts_size,                             DEFAULT_LENGTH * sizeof(*(s->pts)));    if (!s->pts)        return AVERROR(ENOMEM);     s->frames = av_fast_realloc(NULL, &s->frames_size,                                DEFAULT_LENGTH * sizeof(*(s->frames)));    if (!s->frames) {        av_freep(&s->pts);        return AVERROR(ENOMEM);    }     return 0;} static av_cold void uninit(AVFilterContext *ctx){    ReverseContext *s = ctx->priv;     while (s->nb_frames > 0) {        av_frame_free(&s->frames[s->nb_frames - 1]);        s->nb_frames--;    }     av_freep(&s->pts);    av_freep(&s->frames);} static int filter_frame(AVFilterLink *inlink, AVFrame *in){    AVFilterContext *ctx = inlink->dst;    ReverseContext *s    = ctx->priv;    void *ptr;     if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {        ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);        if (!ptr)            return AVERROR(ENOMEM);        s->pts = ptr;    }     if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {        ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);        if (!ptr)            return AVERROR(ENOMEM);        s->frames = ptr;    }     s->frames[s->nb_frames] = in;    s->pts[s->nb_frames]    = in->pts;    s->nb_frames++;     return 0;} #if CONFIG_REVERSE_FILTER static int request_frame(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    ReverseContext *s = ctx->priv;    int ret;     ret = ff_request_frame(ctx->inputs[0]);     if (ret == AVERROR_EOF && s->nb_frames > 0) {        AVFrame *out = s->frames[s->nb_frames - 1];        out->pts     = s->pts[s->flush_idx++];        ret          = ff_filter_frame(outlink, out);        s->frames[s->nb_frames - 1] = NULL;        s->nb_frames--;    }     return ret;} static const AVFilterPad reverse_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .filter_frame = filter_frame,    },}; static const AVFilterPad reverse_outputs[] = {    {        .name          = "default",        .type          = AVMEDIA_TYPE_VIDEO,        .request_frame = request_frame,    },}; const AVFilter ff_vf_reverse = {    .name        = "reverse",    .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),    .priv_size   = sizeof(ReverseContext),    .init        = init,    .uninit      = uninit,    FILTER_INPUTS(reverse_inputs),    FILTER_OUTPUTS(reverse_outputs),}; #endif /* CONFIG_REVERSE_FILTER */ #if CONFIG_AREVERSE_FILTER static void reverse_samples_planar(AVFrame *out){    for (int p = 0; p < out->ch_layout.nb_channels; p++) {        switch (out->format) {        case AV_SAMPLE_FMT_U8P: {            uint8_t *dst = (uint8_t *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(uint8_t, dst[i], dst[j]);        }            break;        case AV_SAMPLE_FMT_S16P: {            int16_t *dst = (int16_t *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(int16_t, dst[i], dst[j]);        }            break;        case AV_SAMPLE_FMT_S32P: {            int32_t *dst = (int32_t *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(int32_t, dst[i], dst[j]);        }            break;        case AV_SAMPLE_FMT_S64P: {            int64_t *dst = (int64_t *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(int64_t, dst[i], dst[j]);        }            break;        case AV_SAMPLE_FMT_FLTP: {            float *dst = (float *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(float, dst[i], dst[j]);        }            break;        case AV_SAMPLE_FMT_DBLP: {            double *dst = (double *)out->extended_data[p];            for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)                FFSWAP(double, dst[i], dst[j]);        }            break;        }    }} static void reverse_samples_packed(AVFrame *out){    const int channels = out->ch_layout.nb_channels;     switch (out->format) {    case AV_SAMPLE_FMT_U8: {        uint8_t *dst = (uint8_t *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(uint8_t, dst[i * channels + p], dst[j * channels + p]);    }        break;    case AV_SAMPLE_FMT_S16: {        int16_t *dst = (int16_t *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(int16_t, dst[i * channels + p], dst[j * channels + p]);    }        break;    case AV_SAMPLE_FMT_S32: {        int32_t *dst = (int32_t *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(int32_t, dst[i * channels + p], dst[j * channels + p]);    }        break;    case AV_SAMPLE_FMT_S64: {        int64_t *dst = (int64_t *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(int64_t, dst[i * channels + p], dst[j * channels + p]);    }        break;    case AV_SAMPLE_FMT_FLT: {        float *dst = (float *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(float, dst[i * channels + p], dst[j * channels + p]);    }        break;    case AV_SAMPLE_FMT_DBL: {        double *dst = (double *)out->extended_data[0];        for (int i = 0, j = out->nb_samples - 1; i < j; i++, j--)            for (int p = 0; p < channels; p++)                FFSWAP(double, dst[i * channels + p], dst[j * channels + p]);    }        break;    }} static int areverse_request_frame(AVFilterLink *outlink){    AVFilterContext *ctx = outlink->src;    ReverseContext *s = ctx->priv;    int ret;     ret = ff_request_frame(ctx->inputs[0]);     if (ret == AVERROR_EOF && s->nb_frames > 0) {        AVFrame *out = s->frames[s->nb_frames - 1];        out->pts     = s->pts[s->flush_idx++] - s->nb_samples;        s->nb_samples += s->pts[s->flush_idx] - s->pts[s->flush_idx - 1] - out->nb_samples;         if (av_sample_fmt_is_planar(out->format))            reverse_samples_planar(out);        else            reverse_samples_packed(out);        ret = ff_filter_frame(outlink, out);        s->frames[s->nb_frames - 1] = NULL;        s->nb_frames--;    }     return ret;} static const AVFilterPad areverse_inputs[] = {    {        .name           = "default",        .type           = AVMEDIA_TYPE_AUDIO,        .flags          = AVFILTERPAD_FLAG_NEEDS_WRITABLE,        .filter_frame   = filter_frame,    },}; static const AVFilterPad areverse_outputs[] = {    {        .name          = "default",        .type          = AVMEDIA_TYPE_AUDIO,        .request_frame = areverse_request_frame,    },}; const AVFilter ff_af_areverse = {    .name          = "areverse",    .description   = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),    .priv_size     = sizeof(ReverseContext),    .init          = init,    .uninit        = uninit,    FILTER_INPUTS(areverse_inputs),    FILTER_OUTPUTS(areverse_outputs),}; #endif /* CONFIG_AREVERSE_FILTER */