/* * Copyright (c) 2011 Stefano Sabatini * * 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 */ /** * @file * filter for selecting which frame passes in the filterchain */ #include "libavutil/avstring.h"#include "libavutil/eval.h"#include "libavutil/fifo.h"#include "libavutil/imgutils.h"#include "libavutil/internal.h"#include "libavutil/opt.h"#include "libavutil/pixdesc.h"#include "avfilter.h"#include "audio.h"#include "formats.h"#include "internal.h"#include "video.h"#include "scene_sad.h" static const char *const var_names[] = {    "TB",                ///< timebase     "pts",               ///< original pts in the file of the frame    "start_pts",         ///< first PTS in the stream, expressed in TB units    "prev_pts",          ///< previous frame PTS    "prev_selected_pts", ///< previous selected frame PTS     "t",                 ///< timestamp expressed in seconds    "start_t",           ///< first PTS in the stream, expressed in seconds    "prev_t",            ///< previous frame time    "prev_selected_t",   ///< previously selected time     "pict_type",         ///< the type of picture in the movie    "I",    "P",    "B",    "S",    "SI",    "SP",    "BI",    "PICT_TYPE_I",    "PICT_TYPE_P",    "PICT_TYPE_B",    "PICT_TYPE_S",    "PICT_TYPE_SI",    "PICT_TYPE_SP",    "PICT_TYPE_BI",     "interlace_type",    ///< the frame interlace type    "PROGRESSIVE",    "TOPFIRST",    "BOTTOMFIRST",     "consumed_samples_n",///< number of samples consumed by the filter (only audio)    "samples_n",         ///< number of samples in the current frame (only audio)    "sample_rate",       ///< sample rate (only audio)     "n",                 ///< frame number (starting from zero)    "selected_n",        ///< selected frame number (starting from zero)    "prev_selected_n",   ///< number of the last selected frame     "key",               ///< tell if the frame is a key frame    "pos",               ///< original position in the file of the frame     "scene",     "concatdec_select",  ///< frame is within the interval set by the concat demuxer     NULL}; enum var_name {    VAR_TB,     VAR_PTS,    VAR_START_PTS,    VAR_PREV_PTS,    VAR_PREV_SELECTED_PTS,     VAR_T,    VAR_START_T,    VAR_PREV_T,    VAR_PREV_SELECTED_T,     VAR_PICT_TYPE,    VAR_I,    VAR_P,    VAR_B,    VAR_S,    VAR_SI,    VAR_SP,    VAR_BI,    VAR_PICT_TYPE_I,    VAR_PICT_TYPE_P,    VAR_PICT_TYPE_B,    VAR_PICT_TYPE_S,    VAR_PICT_TYPE_SI,    VAR_PICT_TYPE_SP,    VAR_PICT_TYPE_BI,     VAR_INTERLACE_TYPE,    VAR_INTERLACE_TYPE_P,    VAR_INTERLACE_TYPE_T,    VAR_INTERLACE_TYPE_B,     VAR_CONSUMED_SAMPLES_N,    VAR_SAMPLES_N,    VAR_SAMPLE_RATE,     VAR_N,    VAR_SELECTED_N,    VAR_PREV_SELECTED_N,     VAR_KEY,    VAR_POS,     VAR_SCENE,     VAR_CONCATDEC_SELECT,     VAR_VARS_NB}; typedef struct SelectContext {    const AVClass *class;    char *expr_str;    AVExpr *expr;    double var_values[VAR_VARS_NB];    int bitdepth;    int nb_planes;    ptrdiff_t width[4];    ptrdiff_t height[4];    int do_scene_detect;            ///< 1 if the expression requires scene detection variables, 0 otherwise    ff_scene_sad_fn sad;            ///< Sum of the absolute difference function (scene detect only)    double prev_mafd;               ///< previous MAFD                           (scene detect only)    AVFrame *prev_picref;           ///< previous frame                          (scene detect only)    double select;    int select_out;                 ///< mark the selected output pad index    int nb_outputs;} SelectContext; #define OFFSET(x) offsetof(SelectContext, x)#define DEFINE_OPTIONS(filt_name, FLAGS)                            \static const AVOption filt_name##_options[] = {                     \    { "expr", "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \    { "e",    "set an expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags=FLAGS }, \    { "outputs", "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \    { "n",       "set the number of outputs", OFFSET(nb_outputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, .flags=FLAGS }, \    { NULL }                                                            \} static int request_frame(AVFilterLink *outlink); static av_cold int init(AVFilterContext *ctx){    SelectContext *select = ctx->priv;    int i, ret;     if ((ret = av_expr_parse(&select->expr, select->expr_str,                             var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {        av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",               select->expr_str);        return ret;    }    select->do_scene_detect = !!strstr(select->expr_str, "scene");     for (i = 0; i < select->nb_outputs; i++) {        AVFilterPad pad = { 0 };         pad.name = av_asprintf("output%d", i);        if (!pad.name)            return AVERROR(ENOMEM);        pad.type = ctx->filter->inputs[0].type;        pad.request_frame = request_frame;        if ((ret = ff_insert_outpad(ctx, i, &pad)) < 0) {            av_freep(&pad.name);            return ret;        }    }     return 0;} #define INTERLACE_TYPE_P 0#define INTERLACE_TYPE_T 1#define INTERLACE_TYPE_B 2 static int config_input(AVFilterLink *inlink){    SelectContext *select = inlink->dst->priv;    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);    int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&                 (desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&                 desc->nb_components >= 3;     select->bitdepth = desc->comp[0].depth;    select->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);     for (int plane = 0; plane < select->nb_planes; plane++) {        ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);        int vsub = desc->log2_chroma_h;         select->width[plane] = line_size >> (select->bitdepth > 8);        select->height[plane] = plane == 1 || plane == 2 ?  AV_CEIL_RSHIFT(inlink->h, vsub) : inlink->h;    }     select->var_values[VAR_N]          = 0.0;    select->var_values[VAR_SELECTED_N] = 0.0;     select->var_values[VAR_TB] = av_q2d(inlink->time_base);     select->var_values[VAR_PREV_PTS]          = NAN;    select->var_values[VAR_PREV_SELECTED_PTS] = NAN;    select->var_values[VAR_PREV_SELECTED_T]   = NAN;    select->var_values[VAR_PREV_T]            = NAN;    select->var_values[VAR_START_PTS]         = NAN;    select->var_values[VAR_START_T]           = NAN;     select->var_values[VAR_I]  = AV_PICTURE_TYPE_I;    select->var_values[VAR_P]  = AV_PICTURE_TYPE_P;    select->var_values[VAR_B]  = AV_PICTURE_TYPE_B;    select->var_values[VAR_SI] = AV_PICTURE_TYPE_SI;    select->var_values[VAR_SP] = AV_PICTURE_TYPE_SP;    select->var_values[VAR_BI] = AV_PICTURE_TYPE_BI;    select->var_values[VAR_PICT_TYPE_I]  = AV_PICTURE_TYPE_I;    select->var_values[VAR_PICT_TYPE_P]  = AV_PICTURE_TYPE_P;    select->var_values[VAR_PICT_TYPE_B]  = AV_PICTURE_TYPE_B;    select->var_values[VAR_PICT_TYPE_SI] = AV_PICTURE_TYPE_SI;    select->var_values[VAR_PICT_TYPE_SP] = AV_PICTURE_TYPE_SP;    select->var_values[VAR_PICT_TYPE_BI] = AV_PICTURE_TYPE_BI;     select->var_values[VAR_INTERLACE_TYPE_P] = INTERLACE_TYPE_P;    select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;    select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;     select->var_values[VAR_PICT_TYPE]         = NAN;    select->var_values[VAR_INTERLACE_TYPE]    = NAN;    select->var_values[VAR_SCENE]             = NAN;    select->var_values[VAR_CONSUMED_SAMPLES_N] = NAN;    select->var_values[VAR_SAMPLES_N]          = NAN;     select->var_values[VAR_SAMPLE_RATE] =        inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;     if (CONFIG_SELECT_FILTER && select->do_scene_detect) {        select->sad = ff_scene_sad_get_fn(select->bitdepth == 8 ? 8 : 16);        if (!select->sad)            return AVERROR(EINVAL);    }    return 0;} static double get_scene_score(AVFilterContext *ctx, AVFrame *frame){    double ret = 0;    SelectContext *select = ctx->priv;    AVFrame *prev_picref = select->prev_picref;     if (prev_picref &&        frame->height == prev_picref->height &&        frame->width  == prev_picref->width) {        uint64_t sad = 0;        double mafd, diff;        uint64_t count = 0;         for (int plane = 0; plane < select->nb_planes; plane++) {            uint64_t plane_sad;            select->sad(prev_picref->data[plane], prev_picref->linesize[plane],                    frame->data[plane], frame->linesize[plane],                    select->width[plane], select->height[plane], &plane_sad);            sad += plane_sad;            count += select->width[plane] * select->height[plane];        }         emms_c();        mafd = (double)sad / count / (1ULL << (select->bitdepth - 8));        diff = fabs(mafd - select->prev_mafd);        ret  = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);        select->prev_mafd = mafd;        av_frame_free(&prev_picref);    }    select->prev_picref = av_frame_clone(frame);    return ret;} static double get_concatdec_select(AVFrame *frame, int64_t pts){    AVDictionary *metadata = frame->metadata;    AVDictionaryEntry *start_time_entry = av_dict_get(metadata, "lavf.concatdec.start_time", NULL, 0);    AVDictionaryEntry *duration_entry = av_dict_get(metadata, "lavf.concatdec.duration", NULL, 0);    if (start_time_entry) {        int64_t start_time = strtoll(start_time_entry->value, NULL, 10);        if (pts >= start_time) {            if (duration_entry) {              int64_t duration = strtoll(duration_entry->value, NULL, 10);              if (pts < start_time + duration)                  return -1;              else                  return 0;            }            return -1;        }        return 0;    }    return NAN;} #define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) static void select_frame(AVFilterContext *ctx, AVFrame *frame){    SelectContext *select = ctx->priv;    AVFilterLink *inlink = ctx->inputs[0];    double res;     if (isnan(select->var_values[VAR_START_PTS]))        select->var_values[VAR_START_PTS] = TS2D(frame->pts);    if (isnan(select->var_values[VAR_START_T]))        select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);     select->var_values[VAR_N  ] = inlink->frame_count_out;    select->var_values[VAR_PTS] = TS2D(frame->pts);    select->var_values[VAR_T  ] = TS2D(frame->pts) * av_q2d(inlink->time_base);    select->var_values[VAR_POS] = frame->pkt_pos == -1 ? NAN : frame->pkt_pos;    select->var_values[VAR_KEY] = frame->key_frame;    select->var_values[VAR_CONCATDEC_SELECT] = get_concatdec_select(frame, av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q));     switch (inlink->type) {    case AVMEDIA_TYPE_AUDIO:        select->var_values[VAR_SAMPLES_N] = frame->nb_samples;        break;     case AVMEDIA_TYPE_VIDEO:        select->var_values[VAR_INTERLACE_TYPE] =            !frame->interlaced_frame ? INTERLACE_TYPE_P :        frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;        select->var_values[VAR_PICT_TYPE] = frame->pict_type;        if (select->do_scene_detect) {            char buf[32];            select->var_values[VAR_SCENE] = get_scene_score(ctx, frame);            // TODO: document metadata            snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);            av_dict_set(&frame->metadata, "lavfi.scene_score", buf, 0);        }        break;    }     select->select = res = av_expr_eval(select->expr, select->var_values, NULL);    av_log(inlink->dst, AV_LOG_DEBUG,           "n:%f pts:%f t:%f key:%d",           select->var_values[VAR_N],           select->var_values[VAR_PTS],           select->var_values[VAR_T],           frame->key_frame);     switch (inlink->type) {    case AVMEDIA_TYPE_VIDEO:        av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c scene:%f",               (!frame->interlaced_frame) ? 'P' :               frame->top_field_first     ? 'T' : 'B',               av_get_picture_type_char(frame->pict_type),               select->var_values[VAR_SCENE]);        break;    case AVMEDIA_TYPE_AUDIO:        av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%f",               frame->nb_samples,               select->var_values[VAR_CONSUMED_SAMPLES_N]);        break;    }     if (res == 0) {        select->select_out = -1; /* drop */    } else if (isnan(res) || res < 0) {        select->select_out = 0; /* first output */    } else {        select->select_out = FFMIN(ceilf(res)-1, select->nb_outputs-1); /* other outputs */    }     av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f select_out:%d\n", res, select->select_out);     if (res) {        select->var_values[VAR_PREV_SELECTED_N]   = select->var_values[VAR_N];        select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];        select->var_values[VAR_PREV_SELECTED_T]   = select->var_values[VAR_T];        select->var_values[VAR_SELECTED_N] += 1.0;        if (inlink->type == AVMEDIA_TYPE_AUDIO)            select->var_values[VAR_CONSUMED_SAMPLES_N] += frame->nb_samples;    }     select->var_values[VAR_PREV_PTS] = select->var_values[VAR_PTS];    select->var_values[VAR_PREV_T]   = select->var_values[VAR_T];} static int filter_frame(AVFilterLink *inlink, AVFrame *frame){    AVFilterContext *ctx = inlink->dst;    SelectContext *select = ctx->priv;     select_frame(ctx, frame);    if (select->select)        return ff_filter_frame(ctx->outputs[select->select_out], frame);     av_frame_free(&frame);    return 0;} static int request_frame(AVFilterLink *outlink){    AVFilterLink *inlink = outlink->src->inputs[0];    int ret = ff_request_frame(inlink);    return ret;} static av_cold void uninit(AVFilterContext *ctx){    SelectContext *select = ctx->priv;    int i;     av_expr_free(select->expr);    select->expr = NULL;     for (i = 0; i < ctx->nb_outputs; i++)        av_freep(&ctx->output_pads[i].name);     if (select->do_scene_detect) {        av_frame_free(&select->prev_picref);    }} #if CONFIG_ASELECT_FILTER DEFINE_OPTIONS(aselect, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);AVFILTER_DEFINE_CLASS(aselect); static av_cold int aselect_init(AVFilterContext *ctx){    SelectContext *select = ctx->priv;    int ret;     if ((ret = init(ctx)) < 0)        return ret;     if (select->do_scene_detect) {        av_log(ctx, AV_LOG_ERROR, "Scene detection is ignored in aselect filter\n");        return AVERROR(EINVAL);    }     return 0;} static const AVFilterPad avfilter_af_aselect_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_input,        .filter_frame = filter_frame,    },    { NULL }}; AVFilter ff_af_aselect = {    .name        = "aselect",    .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),    .init        = aselect_init,    .uninit      = uninit,    .priv_size   = sizeof(SelectContext),    .inputs      = avfilter_af_aselect_inputs,    .priv_class  = &aselect_class,    .flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS,};#endif /* CONFIG_ASELECT_FILTER */ #if CONFIG_SELECT_FILTER static int query_formats(AVFilterContext *ctx){    SelectContext *select = ctx->priv;     if (!select->do_scene_detect) {

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