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407 lines
13 KiB
407 lines
13 KiB
/* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <float.h> |
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#include <math.h> |
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#include "config.h" |
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#include "libavutil/avassert.h" |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/common.h" |
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#include "libavutil/log.h" |
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#include "libavutil/mathematics.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/samplefmt.h" |
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#include "audio.h" |
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#include "avfilter.h" |
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#include "internal.h" |
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typedef struct TrimContext { |
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const AVClass *class; |
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/* |
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* AVOptions |
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*/ |
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double duration; |
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double start_time, end_time; |
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int64_t start_frame, end_frame; |
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/* |
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* in the link timebase for video, |
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* in 1/samplerate for audio |
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*/ |
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int64_t start_pts, end_pts; |
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int64_t start_sample, end_sample; |
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/* |
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* number of video frames that arrived on this filter so far |
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*/ |
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int64_t nb_frames; |
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/* |
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* number of audio samples that arrived on this filter so far |
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*/ |
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int64_t nb_samples; |
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/* |
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* timestamp of the first frame in the output, in the timebase units |
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*/ |
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int64_t first_pts; |
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/* |
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* duration in the timebase units |
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*/ |
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int64_t duration_tb; |
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int64_t next_pts; |
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int eof; |
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int got_output; |
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} TrimContext; |
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static int init(AVFilterContext *ctx) |
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{ |
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TrimContext *s = ctx->priv; |
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s->first_pts = AV_NOPTS_VALUE; |
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return 0; |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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TrimContext *s = ctx->priv; |
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AVRational tb = (inlink->type == AVMEDIA_TYPE_VIDEO) ? |
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inlink->time_base : (AVRational){ 1, inlink->sample_rate }; |
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if (s->start_time != DBL_MAX) { |
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int64_t start_pts = lrintf(s->start_time / av_q2d(tb)); |
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if (s->start_pts == AV_NOPTS_VALUE || start_pts < s->start_pts) |
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s->start_pts = start_pts; |
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} |
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if (s->end_time != DBL_MAX) { |
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int64_t end_pts = lrintf(s->end_time / av_q2d(tb)); |
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if (s->end_pts == AV_NOPTS_VALUE || end_pts > s->end_pts) |
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s->end_pts = end_pts; |
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} |
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if (s->duration) |
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s->duration_tb = lrintf(s->duration / av_q2d(tb)); |
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return 0; |
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} |
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static int request_frame(AVFilterLink *outlink) |
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{ |
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AVFilterContext *ctx = outlink->src; |
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TrimContext *s = ctx->priv; |
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int ret; |
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s->got_output = 0; |
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while (!s->got_output) { |
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if (s->eof) |
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return AVERROR_EOF; |
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ret = ff_request_frame(ctx->inputs[0]); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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#define OFFSET(x) offsetof(TrimContext, x) |
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#define COMMON_OPTS \ |
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{ "start", "Timestamp in seconds of the first frame that " \ |
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"should be passed", OFFSET(start_time), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \ |
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{ "end", "Timestamp in seconds of the first frame that " \ |
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"should be dropped again", OFFSET(end_time), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \ |
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{ "start_pts", "Timestamp of the first frame that should be " \ |
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" passed", OFFSET(start_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \ |
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{ "end_pts", "Timestamp of the first frame that should be " \ |
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"dropped again", OFFSET(end_pts), AV_OPT_TYPE_INT64, { .i64 = AV_NOPTS_VALUE }, INT64_MIN, INT64_MAX, FLAGS }, \ |
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{ "duration", "Maximum duration of the output in seconds", OFFSET(duration), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, DBL_MAX, FLAGS }, |
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#if CONFIG_TRIM_FILTER |
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static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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TrimContext *s = ctx->priv; |
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int drop; |
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/* drop everything if EOF has already been returned */ |
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if (s->eof) { |
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av_frame_free(&frame); |
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return 0; |
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} |
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if (s->start_frame >= 0 || s->start_pts != AV_NOPTS_VALUE) { |
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drop = 1; |
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if (s->start_frame >= 0 && s->nb_frames >= s->start_frame) |
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drop = 0; |
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if (s->start_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE && |
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frame->pts >= s->start_pts) |
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drop = 0; |
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if (drop) |
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goto drop; |
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} |
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if (s->first_pts == AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE) |
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s->first_pts = frame->pts; |
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if (s->end_frame != INT64_MAX || s->end_pts != AV_NOPTS_VALUE || s->duration_tb) { |
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drop = 1; |
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if (s->end_frame != INT64_MAX && s->nb_frames < s->end_frame) |
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drop = 0; |
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if (s->end_pts != AV_NOPTS_VALUE && frame->pts != AV_NOPTS_VALUE && |
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frame->pts < s->end_pts) |
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drop = 0; |
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if (s->duration_tb && frame->pts != AV_NOPTS_VALUE && |
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frame->pts - s->first_pts < s->duration_tb) |
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drop = 0; |
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if (drop) { |
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s->eof = 1; |
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goto drop; |
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} |
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} |
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s->nb_frames++; |
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s->got_output = 1; |
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return ff_filter_frame(ctx->outputs[0], frame); |
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drop: |
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s->nb_frames++; |
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av_frame_free(&frame); |
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return 0; |
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} |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption trim_options[] = { |
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COMMON_OPTS |
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{ "start_frame", "Number of the first frame that should be passed " |
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"to the output", OFFSET(start_frame), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS }, |
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{ "end_frame", "Number of the first frame that should be dropped " |
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"again", OFFSET(end_frame), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS }, |
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{ NULL }, |
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}; |
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#undef FLAGS |
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static const AVClass trim_class = { |
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.class_name = "trim", |
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.item_name = av_default_item_name, |
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.option = trim_options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static const AVFilterPad trim_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = trim_filter_frame, |
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.config_props = config_input, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad trim_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.request_frame = request_frame, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_vf_trim = { |
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.name = "trim", |
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.description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."), |
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.init = init, |
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.priv_size = sizeof(TrimContext), |
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.priv_class = &trim_class, |
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.inputs = trim_inputs, |
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.outputs = trim_outputs, |
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}; |
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#endif // CONFIG_TRIM_FILTER |
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#if CONFIG_ATRIM_FILTER |
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static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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TrimContext *s = ctx->priv; |
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int64_t start_sample, end_sample = frame->nb_samples; |
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int64_t pts; |
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int drop; |
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/* drop everything if EOF has already been returned */ |
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if (s->eof) { |
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av_frame_free(&frame); |
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return 0; |
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} |
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if (frame->pts != AV_NOPTS_VALUE) |
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pts = av_rescale_q(frame->pts, inlink->time_base, |
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(AVRational){ 1, inlink->sample_rate }); |
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else |
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pts = s->next_pts; |
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s->next_pts = pts + frame->nb_samples; |
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/* check if at least a part of the frame is after the start time */ |
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if (s->start_sample < 0 && s->start_pts == AV_NOPTS_VALUE) { |
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start_sample = 0; |
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} else { |
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drop = 1; |
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start_sample = frame->nb_samples; |
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if (s->start_sample >= 0 && |
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s->nb_samples + frame->nb_samples > s->start_sample) { |
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drop = 0; |
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start_sample = FFMIN(start_sample, s->start_sample - s->nb_samples); |
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} |
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if (s->start_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && |
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pts + frame->nb_samples > s->start_pts) { |
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drop = 0; |
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start_sample = FFMIN(start_sample, s->start_pts - pts); |
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} |
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if (drop) |
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goto drop; |
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} |
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if (s->first_pts == AV_NOPTS_VALUE) |
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s->first_pts = pts + start_sample; |
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/* check if at least a part of the frame is before the end time */ |
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if (s->end_sample == INT64_MAX && s->end_pts == AV_NOPTS_VALUE && !s->duration_tb) { |
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end_sample = frame->nb_samples; |
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} else { |
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drop = 1; |
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end_sample = 0; |
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if (s->end_sample != INT64_MAX && |
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s->nb_samples < s->end_sample) { |
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drop = 0; |
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end_sample = FFMAX(end_sample, s->end_sample - s->nb_samples); |
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} |
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if (s->end_pts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && |
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pts < s->end_pts) { |
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drop = 0; |
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end_sample = FFMAX(end_sample, s->end_pts - pts); |
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} |
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if (s->duration_tb && pts - s->first_pts < s->duration_tb) { |
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drop = 0; |
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end_sample = FFMAX(end_sample, s->first_pts + s->duration_tb - pts); |
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} |
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if (drop) { |
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s->eof = 1; |
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goto drop; |
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} |
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} |
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s->nb_samples += frame->nb_samples; |
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start_sample = FFMAX(0, start_sample); |
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end_sample = FFMIN(frame->nb_samples, end_sample); |
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av_assert0(start_sample < end_sample); |
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if (start_sample) { |
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AVFrame *out = ff_get_audio_buffer(ctx->outputs[0], end_sample - start_sample); |
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if (!out) { |
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av_frame_free(&frame); |
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return AVERROR(ENOMEM); |
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} |
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av_frame_copy_props(out, frame); |
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av_samples_copy(out->extended_data, frame->extended_data, 0, start_sample, |
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out->nb_samples, av_get_channel_layout_nb_channels(frame->channel_layout), |
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frame->format); |
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if (out->pts != AV_NOPTS_VALUE) |
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out->pts += av_rescale_q(start_sample, (AVRational){ 1, out->sample_rate }, |
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inlink->time_base); |
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av_frame_free(&frame); |
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frame = out; |
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} else |
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frame->nb_samples = end_sample; |
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s->got_output = 1; |
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return ff_filter_frame(ctx->outputs[0], frame); |
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drop: |
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s->nb_samples += frame->nb_samples; |
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av_frame_free(&frame); |
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return 0; |
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} |
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM |
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static const AVOption atrim_options[] = { |
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COMMON_OPTS |
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{ "start_sample", "Number of the first audio sample that should be " |
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"passed to the output", OFFSET(start_sample), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, FLAGS }, |
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{ "end_sample", "Number of the first audio sample that should be " |
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"dropped again", OFFSET(end_sample), AV_OPT_TYPE_INT64, { .i64 = INT64_MAX }, 0, INT64_MAX, FLAGS }, |
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{ NULL }, |
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}; |
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#undef FLAGS |
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static const AVClass atrim_class = { |
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.class_name = "atrim", |
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.item_name = av_default_item_name, |
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.option = atrim_options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static const AVFilterPad atrim_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.filter_frame = atrim_filter_frame, |
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.config_props = config_input, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad atrim_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.request_frame = request_frame, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_af_atrim = { |
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.name = "atrim", |
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.description = NULL_IF_CONFIG_SMALL("Pick one continuous section from the input, drop the rest."), |
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.init = init, |
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.priv_size = sizeof(TrimContext), |
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.priv_class = &atrim_class, |
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.inputs = atrim_inputs, |
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.outputs = atrim_outputs, |
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}; |
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#endif // CONFIG_ATRIM_FILTER
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