/* * 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 <stdint.h> #include "libavutil/avstring.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/log.h"#include "libavutil/mathematics.h"#include "libavutil/opt.h"#include "libavutil/parseutils.h"#include "libavutil/samplefmt.h" #include "audio.h"#include "avfilter.h"#include "filters.h"#include "internal.h" typedef struct SegmentContext {    const AVClass *class;     char *timestamps_str;    char *points_str;    int use_timestamps;     int current_point;    int nb_points;     int64_t *points;} SegmentContext; static void count_points(char *item_str, int *nb_items){    char *p;     if (!item_str)        return;     *nb_items = 1;    for (p = item_str; *p; p++) {        if (*p == '|')            (*nb_items)++;    }} static int parse_points(AVFilterContext *ctx, char *item_str, int nb_points, int64_t *points){    SegmentContext *s = ctx->priv;    char *arg, *p = item_str;    char *saveptr = NULL;    int64_t ref, cur = 0;    int ret = 0;     for (int i = 0; i < nb_points; i++) {        if (!(arg = av_strtok(p, "|", &saveptr)))            return AVERROR(EINVAL);         p = NULL;        ref = 0;        if (*arg == '+') {            ref = cur;            arg++;        }         if (s->use_timestamps) {            ret = av_parse_time(&points[i], arg, s->use_timestamps);        } else {            if (sscanf(arg, "%"SCNd64, &points[i]) != 1)                ret = AVERROR(EINVAL);        }         if (ret < 0) {            av_log(ctx, AV_LOG_ERROR, "Invalid splits supplied: %s\n", arg);            return ret;        }         cur = points[i];        points[i] += ref;    }     return 0;} static av_cold int init(AVFilterContext *ctx, enum AVMediaType type){    SegmentContext *s = ctx->priv;    char *split_str;    int ret;     if (s->timestamps_str && s->points_str) {        av_log(ctx, AV_LOG_ERROR, "Both timestamps and counts supplied.\n");        return AVERROR(EINVAL);    } else if (s->timestamps_str) {        s->use_timestamps = 1;        split_str = s->timestamps_str;    } else if (s->points_str) {        split_str = s->points_str;    } else {        av_log(ctx, AV_LOG_ERROR, "Neither timestamps nor durations nor counts supplied.\n");        return AVERROR(EINVAL);    }     count_points(split_str, &s->nb_points);    s->nb_points++;     s->points = av_calloc(s->nb_points, sizeof(*s->points));    if (!s->points)        return AVERROR(ENOMEM);     ret = parse_points(ctx, split_str, s->nb_points - 1, s->points);    if (ret < 0)        return ret;     s->points[s->nb_points - 1] = INT64_MAX;     for (int i = 0; i < s->nb_points; i++) {        AVFilterPad pad = { 0 };         pad.type = type;        pad.name = av_asprintf("output%d", i);        if (!pad.name)            return AVERROR(ENOMEM);         if ((ret = ff_append_outpad_free_name(ctx, &pad)) < 0)            return ret;    }     return 0;} static int config_input(AVFilterLink *inlink){    AVFilterContext *ctx = inlink->dst;    SegmentContext *s = ctx->priv;    AVRational tb = inlink->time_base;     if (s->use_timestamps) {        for (int i = 0; i < s->nb_points - 1; i++)            s->points[i] = av_rescale_q(s->points[i], AV_TIME_BASE_Q, tb);    }     return 0;} static int current_segment_finished(AVFilterContext *ctx, AVFrame *frame){    SegmentContext *s = ctx->priv;    AVFilterLink *inlink = ctx->inputs[0];    int ret = 0;     if (s->use_timestamps) {        ret = frame->pts >= s->points[s->current_point];    } else {        switch (inlink->type) {        case AVMEDIA_TYPE_VIDEO:            ret = inlink->frame_count_out - 1 >= s->points[s->current_point];            break;        case AVMEDIA_TYPE_AUDIO:            ret = inlink->sample_count_out - frame->nb_samples >= s->points[s->current_point];            break;        }    }     return ret;} static int activate(AVFilterContext *ctx){    AVFilterLink *inlink = ctx->inputs[0];    SegmentContext *s = ctx->priv;    AVFrame *frame = NULL;    int ret, status;    int max_samples;    int64_t diff;    int64_t pts;     for (int i = s->current_point; i < s->nb_points; i++) {        FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[i], ctx);    }     switch (inlink->type) {    case AVMEDIA_TYPE_VIDEO:        ret = ff_inlink_consume_frame(inlink, &frame);        break;    case AVMEDIA_TYPE_AUDIO:        diff = s->points[s->current_point] - inlink->sample_count_out;        if (s->use_timestamps) {            max_samples = av_rescale_q(diff, av_make_q(1, inlink->sample_rate), inlink->time_base);        } else {            max_samples = FFMAX(1, FFMIN(diff, INT_MAX));        }        ret = ff_inlink_consume_samples(inlink, 1, max_samples, &frame);        break;    }     if (ret > 0) {        while (current_segment_finished(ctx, frame)) {            ff_outlink_set_status(ctx->outputs[s->current_point], AVERROR_EOF, frame->pts);            s->current_point++;        }         if (s->current_point >= s->nb_points) {            av_frame_free(&frame);            return AVERROR(EINVAL);        }         ret = ff_filter_frame(ctx->outputs[s->current_point], frame);    }     if (ret < 0) {        return ret;    } else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {        for (int i = s->current_point; i < s->nb_points; i++)            ff_outlink_set_status(ctx->outputs[i], status, pts);        return 0;    } else {        for (int i = s->current_point; i < s->nb_points; i++) {            if (ff_outlink_frame_wanted(ctx->outputs[i]))                ff_inlink_request_frame(inlink);        }        return 0;    }} static av_cold void uninit(AVFilterContext *ctx){    SegmentContext *s = ctx->priv;     av_freep(&s->points);} #define OFFSET(x) offsetof(SegmentContext, x)#define COMMON_OPTS \    { "timestamps", "timestamps of input at which to split input", OFFSET(timestamps_str),  AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS }, \ #if CONFIG_SEGMENT_FILTER static av_cold int video_init(AVFilterContext *ctx){    return init(ctx, AVMEDIA_TYPE_VIDEO);} #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption segment_options[] = {    COMMON_OPTS    { "frames", "frames at which to split input", OFFSET(points_str), AV_OPT_TYPE_STRING,  { .str = NULL }, 0, 0, FLAGS },    { NULL }};#undef FLAGS AVFILTER_DEFINE_CLASS(segment); static const AVFilterPad segment_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .config_props = config_input,    },}; const AVFilter ff_vf_segment = {    .name        = "segment",    .description = NULL_IF_CONFIG_SMALL("Segment video stream."),    .init        = video_init,    .uninit      = uninit,    .priv_size   = sizeof(SegmentContext),    .priv_class  = &segment_class,    .activate    = activate,    FILTER_INPUTS(segment_inputs),    .outputs     = NULL,    .flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS,};#endif // CONFIG_SEGMENT_FILTER #if CONFIG_ASEGMENT_FILTER static av_cold int audio_init(AVFilterContext *ctx){    return init(ctx, AVMEDIA_TYPE_AUDIO);} #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption asegment_options[] = {    COMMON_OPTS    { "samples", "samples at which to split input", OFFSET(points_str), AV_OPT_TYPE_STRING,  { .str = NULL }, 0, 0, FLAGS },    { NULL }};#undef FLAGS AVFILTER_DEFINE_CLASS(asegment); static const AVFilterPad asegment_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .config_props = config_input,    },}; const AVFilter ff_af_asegment = {    .name        = "asegment",    .description = NULL_IF_CONFIG_SMALL("Segment audio stream."),    .init        = audio_init,    .uninit      = uninit,    .priv_size   = sizeof(SegmentContext),    .priv_class  = &asegment_class,    .activate    = activate,    FILTER_INPUTS(asegment_inputs),    .outputs     = NULL,    .flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS,};#endif // CONFIG_ASEGMENT_FILTER