lavfi: mv vf_select.c -> f_select.c

The file now contains also an audio select implementation. Also move the
aselect/select documentation from video filters to the multimedia filters
section.

1 files changed, 0 insertions, 441 deletions

diff --git a/libavfilter/vf_select.c b/libavfilter/vf_select.c
deleted file mode 100644
index 2fcf001c89..0000000000
--- a/libavfilter/vf_select.c
+++ /dev/null
@@ -1,441 +0,0 @@
-/*
- * 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/eval.h"
-#include "libavutil/fifo.h"
-#include "libavutil/internal.h"
-#include "avfilter.h"
-#include "audio.h"
-#include "formats.h"
-#include "internal.h"
-#include "video.h"
-
-#if CONFIG_AVCODEC
-#include "libavcodec/dsputil.h"
-#endif
-
-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",                 ///< first PTS 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",
-
-    "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",
-
-    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_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_VARS_NB
-};
-
-typedef struct {
-    AVExpr *expr;
-    double var_values[VAR_VARS_NB];
-    int do_scene_detect;            ///< 1 if the expression requires scene detection variables, 0 otherwise
-#if CONFIG_AVCODEC
-    AVCodecContext *avctx;          ///< codec context required for the DSPContext (scene detect only)
-    DSPContext c;                   ///< context providing optimized SAD methods   (scene detect only)
-    double prev_mafd;               ///< previous MAFD                             (scene detect only)
-#endif
-    AVFilterBufferRef *prev_picref; ///< previous frame                            (scene detect only)
-    double select;
-} SelectContext;
-
-static av_cold int init(AVFilterContext *ctx, const char *args)
-{
-    SelectContext *select = ctx->priv;
-    int ret;
-
-    if ((ret = av_expr_parse(&select->expr, args ? args : "1",
-                             var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
-        return ret;
-    }
-
-    select->do_scene_detect = args && strstr(args, "scene");
-    if (select->do_scene_detect && !CONFIG_AVCODEC) {
-        av_log(ctx, AV_LOG_ERROR, "Scene detection is not available without libavcodec.\n");
-        return AVERROR(EINVAL);
-    }
-    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;
-
-    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_START_PTS]         = NAN;
-    select->var_values[VAR_START_T]           = NAN;
-
-    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_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_SAMPLE_RATE] =
-        inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
-
-    if (CONFIG_AVCODEC && select->do_scene_detect) {
-        select->avctx = avcodec_alloc_context3(NULL);
-        if (!select->avctx)
-            return AVERROR(ENOMEM);
-        dsputil_init(&select->c, select->avctx);
-    }
-    return 0;
-}
-
-#if CONFIG_AVCODEC
-static double get_scene_score(AVFilterContext *ctx, AVFilterBufferRef *picref)
-{
-    double ret = 0;
-    SelectContext *select = ctx->priv;
-    AVFilterBufferRef *prev_picref = select->prev_picref;
-
-    if (prev_picref &&
-        picref->video->h    == prev_picref->video->h &&
-        picref->video->w    == prev_picref->video->w &&
-        picref->linesize[0] == prev_picref->linesize[0]) {
-        int x, y, nb_sad = 0;
-        int64_t sad = 0;
-        double mafd, diff;
-        uint8_t *p1 =      picref->data[0];
-        uint8_t *p2 = prev_picref->data[0];
-        const int linesize = picref->linesize[0];
-
-        for (y = 0; y < picref->video->h - 8; y += 8) {
-            for (x = 0; x < picref->video->w*3 - 8; x += 8) {
-                sad += select->c.sad[1](select, p1 + x, p2 + x,
-                                        linesize, 8);
-                nb_sad += 8 * 8;
-            }
-            p1 += 8 * linesize;
-            p2 += 8 * linesize;
-        }
-        emms_c();
-        mafd = nb_sad ? sad / nb_sad : 0;
-        diff = fabs(mafd - select->prev_mafd);
-        ret  = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
-        select->prev_mafd = mafd;
-        avfilter_unref_buffer(prev_picref);
-    }
-    select->prev_picref = avfilter_ref_buffer(picref, ~0);
-    return ret;
-}
-#endif
-
-#define D2TS(d)  (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
-#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
-
-static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
-{
-    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(picref->pts);
-    if (isnan(select->var_values[VAR_START_T]))
-        select->var_values[VAR_START_T] = TS2D(picref->pts) * av_q2d(inlink->time_base);
-
-    select->var_values[VAR_PTS] = TS2D(picref->pts);
-    select->var_values[VAR_T  ] = TS2D(picref->pts) * av_q2d(inlink->time_base);
-    select->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
-    select->var_values[VAR_PREV_PTS] = TS2D(picref ->pts);
-
-    switch (inlink->type) {
-    case AVMEDIA_TYPE_AUDIO:
-        select->var_values[VAR_SAMPLES_N] = picref->audio->nb_samples;
-        break;
-
-    case AVMEDIA_TYPE_VIDEO:
-        select->var_values[VAR_INTERLACE_TYPE] =
-            !picref->video->interlaced     ? INTERLACE_TYPE_P :
-        picref->video->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
-        select->var_values[VAR_PICT_TYPE] = picref->video->pict_type;
-        if (CONFIG_AVCODEC && select->do_scene_detect) {
-            char buf[32];
-            select->var_values[VAR_SCENE] = get_scene_score(ctx, picref);
-            // TODO: document metadata
-            snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
-            av_dict_set(&picref->metadata, "lavfi.scene_score", buf, 0);
-        }
-        break;
-    }
-
-    res = av_expr_eval(select->expr, select->var_values, NULL);
-    av_log(inlink->dst, AV_LOG_DEBUG,
-           "n:%d pts:%d t:%f pos:%d key:%d",
-           (int)select->var_values[VAR_N],
-           (int)select->var_values[VAR_PTS],
-           select->var_values[VAR_T],
-           (int)select->var_values[VAR_POS],
-           (int)select->var_values[VAR_KEY]);
-
-    switch (inlink->type) {
-    case AVMEDIA_TYPE_VIDEO:
-        av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c",
-               select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_P ? 'P' :
-               select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_T ? 'T' :
-               select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_B ? 'B' : '?',
-               av_get_picture_type_char(select->var_values[VAR_PICT_TYPE]));
-        break;
-    case AVMEDIA_TYPE_AUDIO:
-        av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%d",
-               (int)select->var_values[VAR_SAMPLES_N],
-               (int)select->var_values[VAR_CONSUMED_SAMPLES_N]);
-        break;
-    }
-
-    av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f\n", res);
-
-    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] += picref->audio->nb_samples;
-    }
-
-    select->var_values[VAR_N] += 1.0;
-
-    return res;
-}
-
-static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
-{
-    SelectContext *select = inlink->dst->priv;
-
-    select->select = select_frame(inlink->dst, frame);
-    if (select->select)
-        return ff_filter_frame(inlink->dst->outputs[0], frame);
-
-    avfilter_unref_bufferp(&frame);
-    return 0;
-}
-
-static int request_frame(AVFilterLink *outlink)
-{
-    AVFilterContext *ctx = outlink->src;
-    SelectContext *select = ctx->priv;
-    AVFilterLink *inlink = outlink->src->inputs[0];
-    select->select = 0;
-
-    do {
-        int ret = ff_request_frame(inlink);
-        if (ret < 0)
-            return ret;
-    } while (!select->select);
-
-    return 0;
-}
-
-static av_cold void uninit(AVFilterContext *ctx)
-{
-    SelectContext *select = ctx->priv;
-
-    av_expr_free(select->expr);
-    select->expr = NULL;
-
-    if (select->do_scene_detect) {
-        avfilter_unref_bufferp(&select->prev_picref);
-        if (select->avctx) {
-            avcodec_close(select->avctx);
-            av_freep(&select->avctx);
-        }
-    }
-}
-
-static int query_formats(AVFilterContext *ctx)
-{
-    SelectContext *select = ctx->priv;
-
-    if (!select->do_scene_detect) {
-        return ff_default_query_formats(ctx);
-    } else {
-        static const enum AVPixelFormat pix_fmts[] = {
-            AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
-            AV_PIX_FMT_NONE
-        };
-        ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
-    }
-    return 0;
-}
-
-#if CONFIG_ASELECT_FILTER
-static const AVFilterPad avfilter_af_aselect_inputs[] = {
-    {
-        .name             = "default",
-        .type             = AVMEDIA_TYPE_AUDIO,
-        .get_audio_buffer = ff_null_get_audio_buffer,
-        .config_props     = config_input,
-        .filter_frame     = filter_frame,
-    },
-    { NULL }
-};
-
-static const AVFilterPad avfilter_af_aselect_outputs[] = {
-    {
-        .name = "default",
-        .type = AVMEDIA_TYPE_AUDIO,
-    },
-    { NULL }
-};
-
-AVFilter avfilter_af_aselect = {
-    .name      = "aselect",
-    .description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
-    .init      = init,
-    .uninit    = uninit,
-    .priv_size = sizeof(SelectContext),
-    .inputs    = avfilter_af_aselect_inputs,
-    .outputs   = avfilter_af_aselect_outputs,
-};
-#endif /* CONFIG_ASELECT_FILTER */
-
-#if CONFIG_SELECT_FILTER
-static const AVFilterPad avfilter_vf_select_inputs[] = {
-    {
-        .name             = "default",
-        .type             = AVMEDIA_TYPE_VIDEO,
-        .get_video_buffer = ff_null_get_video_buffer,
-        .min_perms        = AV_PERM_PRESERVE,
-        .config_props     = config_input,
-        .filter_frame     = filter_frame,
-    },
-    { NULL }
-};
-
-static const AVFilterPad avfilter_vf_select_outputs[] = {
-    {
-        .name          = "default",
-        .type          = AVMEDIA_TYPE_VIDEO,
-        .request_frame = request_frame,
-    },
-    { NULL }
-};
-
-AVFilter avfilter_vf_select = {
-    .name      = "select",
-    .description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
-    .init      = init,
-    .uninit    = uninit,
-    .query_formats = query_formats,
-
-    .priv_size = sizeof(SelectContext),
-
-    .inputs    = avfilter_vf_select_inputs,
-    .outputs   = avfilter_vf_select_outputs,
-};
-#endif /* CONFIG_SELECT_FILTER */