/* * 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 "config.h" #include "libavutil/avassert.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/log.h"#include "libavutil/mathematics.h"#include "libavutil/opt.h"#include "libavutil/samplefmt.h" #include "audio.h"#include "avfilter.h"#include "internal.h" typedef struct TrimContext {    const AVClass *class;     /*     * AVOptions     */    int64_t duration;    int64_t start_time, end_time;    int64_t start_frame, end_frame;    /*     * in the link timebase for video,     * in 1/samplerate for audio     */    int64_t start_pts, end_pts;    int64_t start_sample, end_sample;     /*     * number of video frames that arrived on this filter so far     */    int64_t nb_frames;    /*     * number of audio samples that arrived on this filter so far     */    int64_t nb_samples;    /*     * timestamp of the first frame in the output, in the timebase units     */    int64_t first_pts;    /*     * duration in the timebase units     */    int64_t duration_tb;     int64_t next_pts;     int eof;} TrimContext; static av_cold int init(AVFilterContext *ctx){    TrimContext *s = ctx->priv;     s->first_pts = AV_NOPTS_VALUE;     return 0;} static int config_input(AVFilterLink *inlink){    AVFilterContext *ctx = inlink->dst;    TrimContext       *s = ctx->priv;    AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ?                     inlink->time_base : (AVRational){ 1, inlink->sample_rate };     if (s->start_time != INT64_MAX) {        int64_t start_pts = av_rescale_q(s->start_time, AV_TIME_BASE_Q, tb);        if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts)            s->start_pts = start_pts;    }    if (s->end_time != INT64_MAX) {        int64_t end_pts = av_rescale_q(s->end_time, AV_TIME_BASE_Q, tb);        if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts)            s->end_pts = end_pts;    }    if (s->duration)        s->duration_tb = av_rescale_q(s->duration, AV_TIME_BASE_Q, tb);     return 0;} #define OFFSET(x) offsetof(TrimContext, x)#define COMMON_OPTS                                                                                                                                                         \    { "start",       "Timestamp of the first frame that "                                                                                                        \        "should be passed",                                              OFFSET(start_time),  AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \    { "starti",      "Timestamp of the first frame that "                                                                                                        \        "should be passed",                                              OFFSET(start_time),  AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \    { "end",         "Timestamp of the first frame that "                                                                                                        \        "should be dropped again",                                       OFFSET(end_time),    AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \    { "endi",        "Timestamp of the first frame that "                                                                                                        \        "should be dropped again",                                       OFFSET(end_time),    AV_OPT_TYPE_DURATION, { .i64 = INT64_MAX },    INT64_MIN, INT64_MAX, FLAGS }, \    { "start_pts",   "Timestamp of the first frame that should be "                                                                                                         \       " passed",                                                        OFFSET(start_pts),   AV_OPT_TYPE_INT64,  { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \    { "end_pts",     "Timestamp of the first frame that should be "                                                                                                         \        "dropped again",                                                 OFFSET(end_pts),     AV_OPT_TYPE_INT64,  { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \    { "duration",    "Maximum duration of the output",                   OFFSET(duration),    AV_OPT_TYPE_DURATION, { .i64 = 0 },                    0, INT64_MAX, FLAGS }, \    { "durationi",   "Maximum duration of the output",                   OFFSET(duration),    AV_OPT_TYPE_DURATION, { .i64 = 0 },                    0, INT64_MAX, FLAGS },  #if CONFIG_TRIM_FILTERstatic int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame){    AVFilterContext *ctx = inlink->dst;    TrimContext       *s = ctx->priv;    int drop;     /* drop everything if EOF has already been returned */    if (s->eof) {        av_frame_free(&frame);        return 0;    }     if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) {        drop = 1;        if (s->start_frame >= 0 && s->nb_frames >= s->start_frame)            drop = 0;        if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&            frame->pts >= s->start_pts)            drop = 0;        if (drop)            goto drop;    }     if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE)        s->first_pts = frame->pts;     if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) {        drop = 1;         if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame)            drop = 0;        if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE &&            frame->pts < s->end_pts)            drop = 0;        if (s->duration_tb && frame->pts != AV_NOPTS_VALUE &&            frame->pts - s->first_pts < s->duration_tb)            drop = 0;         if (drop) {            s->eof = 1;            ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);            goto drop;        }    }     s->nb_frames++;     return ff_filter_frame(ctx->outputs[0], frame); drop:    s->nb_frames++;    av_frame_free(&frame);    return 0;} #define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption trim_options[] = {    COMMON_OPTS    { "start_frame", "Number of the first frame that should be passed "        "to the output",                                                 OFFSET(start_frame), AV_OPT_TYPE_INT64,  { .i64 = -1 },       -1, INT64_MAX, FLAGS },    { "end_frame",   "Number of the first frame that should be dropped "        "again",                                                         OFFSET(end_frame),   AV_OPT_TYPE_INT64,  { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },    { NULL }};#undef FLAGS AVFILTER_DEFINE_CLASS(trim); static const AVFilterPad trim_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .filter_frame = trim_filter_frame,        .config_props = config_input,    },    { NULL }}; static const AVFilterPad trim_outputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,    },    { NULL }}; AVFilter ff_vf_trim = {    .name        = "trim",    .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),    .init        = init,    .priv_size   = sizeof(TrimContext),    .priv_class  = &trim_class,    .inputs      = trim_inputs,    .outputs     = trim_outputs,};#endif // CONFIG_TRIM_FILTER #if CONFIG_ATRIM_FILTERstatic int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame){    AVFilterContext *ctx = inlink->dst;    TrimContext       *s = ctx->priv;    int64_t start_sample, end_sample;    int64_t pts;    int drop;     /* drop everything if EOF has already been returned */    if (s->eof) {        av_frame_free(&frame);        return 0;    }     if (frame->pts != AV_NOPTS_VALUE)        pts = av_rescale_q(frame->pts, inlink->time_base,                           (AVRational){ 1, inlink->sample_rate });    else        pts = s->next_pts;    s->next_pts = pts + frame->nb_samples;     /* check if at least a part of the frame is after the start time */    if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) {        start_sample = 0;    } else {        drop = 1;        start_sample = frame->nb_samples;         if (s->start_sample >= 0 &&            s->nb_samples + frame->nb_samples > s->start_sample) {            drop         = 0;            start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples);        }         if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&            pts + frame->nb_samples > s->start_pts) {            drop = 0;            start_sample = FFMIN(start_sample, s->start_pts - pts);        }         if (drop)            goto drop;    }     if (s->first_pts == AV_NOPTS_VALUE)        s->first_pts = pts + start_sample;     /* check if at least a part of the frame is before the end time */    if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) {        end_sample = frame->nb_samples;    } else {        drop       = 1;        end_sample = 0;         if (s->end_sample != INT64_MAX &&            s->nb_samples < s->end_sample) {            drop       = 0;            end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples);        }         if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE &&            pts < s->end_pts) {            drop       = 0;            end_sample = FFMAX(end_sample, s->end_pts - pts);        }         if (s->duration_tb && pts - s->first_pts < s->duration_tb) {            drop       = 0;            end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts);        }         if (drop) {            s->eof = 1;            ff_avfilter_link_set_out_status(inlink, AVERROR_EOF, AV_NOPTS_VALUE);            goto drop;        }    }     s->nb_samples += frame->nb_samples;    start_sample   = FFMAX(0, start_sample);    end_sample     = FFMIN(frame->nb_samples, end_sample);    av_assert0(start_sample < end_sample || (start_sample == end_sample && !frame->nb_samples));     if (start_sample) {        AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample);        if (!out) {            av_frame_free(&frame);            return AVERROR(ENOMEM);        }         av_frame_copy_props(out, frame);        av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample,                        out->nb_samples, inlink->channels,                        frame->format);        if (out->pts != AV_NOPTS_VALUE)            out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate },                                     inlink->time_base);         av_frame_free(&frame);        frame = out;    } else        frame->nb_samples = end_sample;     return ff_filter_frame(ctx->outputs[0], frame); drop:    s->nb_samples += frame->nb_samples;    av_frame_free(&frame);    return 0;} #define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAMstatic const AVOption atrim_options[] = {    COMMON_OPTS    { "start_sample", "Number of the first audio sample that should be "        "passed to the output",                                          OFFSET(start_sample), AV_OPT_TYPE_INT64,  { .i64 = -1 },       -1, INT64_MAX, FLAGS },    { "end_sample",   "Number of the first audio sample that should be "        "dropped again",                                                 OFFSET(end_sample),   AV_OPT_TYPE_INT64,  { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS },    { NULL }};#undef FLAGS AVFILTER_DEFINE_CLASS(atrim); static const AVFilterPad atrim_inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = atrim_filter_frame,        .config_props = config_input,    },    { NULL }}; static const AVFilterPad atrim_outputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,    },    { NULL }}; AVFilter ff_af_atrim = {    .name        = "atrim",    .description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."),    .init        = init,    .priv_size   = sizeof(TrimContext),    .priv_class  = &atrim_class,    .inputs      = atrim_inputs,    .outputs     = atrim_outputs,};#endif // CONFIG_ATRIM_FILTER