| /* |
| * 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 <float.h> |
| #include <math.h> |
| #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; |
| |
| double duration_dbl; |
| double start_time_dbl, end_time_dbl; |
| /* |
| * 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_dbl != DBL_MAX) |
| s->start_time = s->start_time_dbl * 1e6; |
| if (s->end_time_dbl != DBL_MAX) |
| s->end_time = s->end_time_dbl * 1e6; |
| if (s->duration_dbl != 0) |
| s->duration = s->duration_dbl * 1e6; |
| |
| 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 \ |
| { "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 }, \ |
| { "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 }, \ |
| { "durationi", "Maximum duration of the output", OFFSET(duration), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT64_MAX, FLAGS }, |
| |
| #define COMPAT_OPTS \ |
| { "start", "Timestamp in seconds of the first frame that " \ |
| "should be passed", OFFSET(start_time_dbl),AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \ |
| { "end", "Timestamp in seconds of the first frame that " \ |
| "should be dropped again", OFFSET(end_time_dbl), AV_OPT_TYPE_DOUBLE, { .dbl = DBL_MAX }, -DBL_MAX, DBL_MAX, FLAGS }, \ |
| { "duration", "Maximum duration of the output in seconds", OFFSET(duration_dbl), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, DBL_MAX, FLAGS }, |
| |
| |
| #if CONFIG_TRIM_FILTER |
| static 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_PARAM |
| static 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 }, |
| COMPAT_OPTS |
| { 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_FILTER |
| static 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_PARAM |
| static 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 }, |
| COMPAT_OPTS |
| { 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, |
| .query_formats = ff_query_formats_all, |
| .priv_size = sizeof(TrimContext), |
| .priv_class = &atrim_class, |
| .inputs = atrim_inputs, |
| .outputs = atrim_outputs, |
| }; |
| #endif // CONFIG_ATRIM_FILTER |
