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avcodec: add setts bitstream filter
This commit is contained in:
Paul B Mahol
parent
000b25096b
commit
48a0eb21aa
@ -72,6 +72,7 @@ version <next>:
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- aexciter audio filter
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- exposure video filter
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- monochrome video filter
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- setts bitstream filter
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version 4.3:
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@ -675,6 +675,60 @@ Remove extradata from all frames.
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@end table
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@end table
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@section setts
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Set PTS and DTS in packets.
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It accepts the following parameters:
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@table @option
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@item ts
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@item pts
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@item dts
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Set expressions for PTS, DTS or both.
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@end table
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The expressions are evaluated through the eval API and can contain the following
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constants:
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@table @option
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@item N
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The count of the input packet. Starting from 0.
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@item TS
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The demux timestamp in input in case of @code{ts} or @code{dts} option or presentation
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timestamp in case of @code{pts} option.
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@item POS
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The original position in the file of the packet, or undefined if undefined
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for the current packet
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@item DTS
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The demux timestamp in input.
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@item PTS
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The presentation timestamp in input.
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@item STARTDTS
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The DTS of the first packet.
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@item STARTPTS
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The PTS of the first packet.
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@item PREV_INDTS
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The previous input DTS.
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@item PREV_INPTS
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The previous input PTS.
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@item PREV_OUTDTS
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The previous output DTS.
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@item PREV_OUTPTS
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The previous output PTS.
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@item TB
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The timebase of stream packet belongs.
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@end table
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@anchor{text2movsub}
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@section text2movsub
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@ -1163,6 +1163,7 @@ OBJS-$(CONFIG_OPUS_METADATA_BSF) += opus_metadata_bsf.o
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OBJS-$(CONFIG_PCM_RECHUNK_BSF) += pcm_rechunk_bsf.o
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OBJS-$(CONFIG_PRORES_METADATA_BSF) += prores_metadata_bsf.o
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OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o
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OBJS-$(CONFIG_SETTS_BSF) += setts_bsf.o
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OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o
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OBJS-$(CONFIG_TRACE_HEADERS_BSF) += trace_headers_bsf.o
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OBJS-$(CONFIG_TRUEHD_CORE_BSF) += truehd_core_bsf.o mlp_parse.o mlp.o
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@ -53,6 +53,7 @@ extern const AVBitStreamFilter ff_opus_metadata_bsf;
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extern const AVBitStreamFilter ff_pcm_rechunk_bsf;
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extern const AVBitStreamFilter ff_prores_metadata_bsf;
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extern const AVBitStreamFilter ff_remove_extradata_bsf;
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extern const AVBitStreamFilter ff_setts_bsf;
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extern const AVBitStreamFilter ff_text2movsub_bsf;
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extern const AVBitStreamFilter ff_trace_headers_bsf;
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extern const AVBitStreamFilter ff_truehd_core_bsf;
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218
libavcodec/setts_bsf.c
Normal file
218
libavcodec/setts_bsf.c
Normal file
@ -0,0 +1,218 @@
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/*
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* Copyright (c) 2021 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file
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* Change the PTS/DTS timestamps.
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*/
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#include "libavutil/opt.h"
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#include "libavutil/eval.h"
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#include "avcodec.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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static const char *const var_names[] = {
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"N", ///< frame number (starting at zero)
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"TS",
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"POS", ///< original position in the file of the frame
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"PREV_INPTS", ///< previous input PTS
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"PREV_INDTS", ///< previous input DTS
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"PREV_OUTPTS", ///< previous output PTS
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"PREV_OUTDTS", ///< previous output DTS
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"PTS", ///< original PTS in the file of the frame
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"DTS", ///< original DTS in the file of the frame
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"STARTPTS", ///< PTS at start of movie
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"STARTDTS", ///< DTS at start of movie
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"TB", ///< timebase of the stream
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NULL
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};
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enum var_name {
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VAR_N,
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VAR_TS,
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VAR_POS,
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VAR_PREV_INPTS,
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VAR_PREV_INDTS,
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VAR_PREV_OUTPTS,
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VAR_PREV_OUTDTS,
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VAR_PTS,
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VAR_DTS,
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VAR_STARTPTS,
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VAR_STARTDTS,
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VAR_TB,
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VAR_VARS_NB
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};
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typedef struct SetTSContext {
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const AVClass *class;
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char *ts_str;
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char *pts_str;
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char *dts_str;
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int64_t frame_number;
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int64_t start_pts;
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int64_t start_dts;
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int64_t prev_inpts;
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int64_t prev_indts;
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int64_t prev_outpts;
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int64_t prev_outdts;
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double var_values[VAR_VARS_NB];
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AVExpr *ts_expr;
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AVExpr *pts_expr;
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AVExpr *dts_expr;
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} SetTSContext;
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static int setts_init(AVBSFContext *ctx)
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{
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SetTSContext *s = ctx->priv_data;
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int ret;
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if ((ret = av_expr_parse(&s->ts_expr, s->ts_str,
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing ts expression '%s'\n", s->ts_str);
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return ret;
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}
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if (s->pts_str) {
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if ((ret = av_expr_parse(&s->pts_expr, s->pts_str,
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing pts expression '%s'\n", s->pts_str);
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return ret;
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}
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}
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if (s->dts_str) {
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if ((ret = av_expr_parse(&s->dts_expr, s->dts_str,
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var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error while parsing dts expression '%s'\n", s->dts_str);
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return ret;
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}
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}
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s->frame_number= 0;
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s->start_pts = AV_NOPTS_VALUE;
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s->start_dts = AV_NOPTS_VALUE;
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s->prev_inpts = AV_NOPTS_VALUE;
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s->prev_indts = AV_NOPTS_VALUE;
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s->prev_outpts = AV_NOPTS_VALUE;
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s->prev_outdts = AV_NOPTS_VALUE;
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return 0;
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}
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static int setts_filter(AVBSFContext *ctx, AVPacket *pkt)
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{
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SetTSContext *s = ctx->priv_data;
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int64_t new_ts, new_pts, new_dts;
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int ret;
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ret = ff_bsf_get_packet_ref(ctx, pkt);
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if (ret < 0)
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return ret;
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if (s->start_pts == AV_NOPTS_VALUE)
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s->start_pts = pkt->pts;
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if (s->start_dts == AV_NOPTS_VALUE)
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s->start_dts = pkt->dts;
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s->var_values[VAR_N] = s->frame_number++;
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s->var_values[VAR_TS] = pkt->dts;
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s->var_values[VAR_POS] = pkt->pos;
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s->var_values[VAR_PTS] = pkt->pts;
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s->var_values[VAR_DTS] = pkt->dts;
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s->var_values[VAR_PREV_INPTS] = s->prev_inpts;
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s->var_values[VAR_PREV_INDTS] = s->prev_indts;
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s->var_values[VAR_PREV_OUTPTS] = s->prev_outpts;
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s->var_values[VAR_PREV_OUTDTS] = s->prev_outdts;
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s->var_values[VAR_STARTPTS] = s->start_pts;
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s->var_values[VAR_STARTDTS] = s->start_dts;
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s->var_values[VAR_TB] = av_q2d(ctx->time_base_out);
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new_ts = llrint(av_expr_eval(s->ts_expr, s->var_values, NULL));
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if (s->pts_str) {
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s->var_values[VAR_TS] = pkt->pts;
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new_pts = llrint(av_expr_eval(s->pts_expr, s->var_values, NULL));
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} else {
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new_pts = new_ts;
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}
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if (s->dts_str) {
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s->var_values[VAR_TS] = pkt->dts;
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new_dts = llrint(av_expr_eval(s->dts_expr, s->var_values, NULL));
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} else {
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new_dts = new_ts;
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}
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s->var_values[VAR_PREV_INPTS] = pkt->pts;
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s->var_values[VAR_PREV_INDTS] = pkt->dts;
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s->var_values[VAR_PREV_OUTPTS] = new_pts;
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s->var_values[VAR_PREV_OUTDTS] = new_dts;
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pkt->pts = new_pts;
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pkt->dts = new_dts;
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return ret;
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}
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static void setts_close(AVBSFContext *bsf)
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{
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SetTSContext *s = bsf->priv_data;
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av_expr_free(s->ts_expr);
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s->ts_expr = NULL;
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av_expr_free(s->pts_expr);
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s->pts_expr = NULL;
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av_expr_free(s->dts_expr);
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s->dts_expr = NULL;
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}
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#define OFFSET(x) offsetof(SetTSContext, x)
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#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_BSF_PARAM)
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static const AVOption options[] = {
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{ "ts", "set expression for packet PTS and DTS", OFFSET(ts_str), AV_OPT_TYPE_STRING, {.str="TS"}, 0, 0, FLAGS },
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{ "pts", "set expression for packet PTS", OFFSET(pts_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
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{ "dts", "set expression for packet DTS", OFFSET(dts_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
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{ NULL },
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};
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static const AVClass setts_class = {
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.class_name = "setts_bsf",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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const AVBitStreamFilter ff_setts_bsf = {
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.name = "setts",
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.priv_data_size = sizeof(SetTSContext),
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.priv_class = &setts_class,
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.init = setts_init,
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.close = setts_close,
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.filter = setts_filter,
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};
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@ -28,7 +28,7 @@
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#include "libavutil/version.h"
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#define LIBAVCODEC_VERSION_MAJOR 58
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#define LIBAVCODEC_VERSION_MINOR 122
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#define LIBAVCODEC_VERSION_MINOR 123
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#define LIBAVCODEC_VERSION_MICRO 100
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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