mirror of
https://github.com/FFmpeg/FFmpeg.git
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f4098bbc3b
This patch is analogous to 20f9727018
:
It hides the internal part of AVBitStreamFilter by adding a new
internal structure FFBitStreamFilter (declared in bsf_internal.h)
that has an AVBitStreamFilter as its first member; the internal
part of AVBitStreamFilter is moved to this new structure.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
278 lines
8.7 KiB
C
278 lines
8.7 KiB
C
/*
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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 "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_INDURATION", ///< previous input duration
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"PREV_OUTPTS", ///< previous output PTS
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"PREV_OUTDTS", ///< previous output DTS
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"PREV_OUTDURATION", ///< previous output duration
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"NEXT_PTS", ///< next input PTS
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"NEXT_DTS", ///< next input DTS
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"NEXT_DURATION", ///< next input duration
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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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"DURATION", ///< original duration 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", ///< input timebase of the stream
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"TB_OUT", ///< output timebase of the stream
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"SR", ///< sample rate of the stream
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"NOPTS", ///< The AV_NOPTS_VALUE constant
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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_INDUR,
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VAR_PREV_OUTPTS,
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VAR_PREV_OUTDTS,
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VAR_PREV_OUTDUR,
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VAR_NEXT_PTS,
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VAR_NEXT_DTS,
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VAR_NEXT_DUR,
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VAR_PTS,
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VAR_DTS,
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VAR_DURATION,
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VAR_STARTPTS,
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VAR_STARTDTS,
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VAR_TB,
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VAR_TB_OUT,
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VAR_SR,
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VAR_NOPTS,
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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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char *duration_str;
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AVRational time_base;
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int64_t frame_number;
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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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AVExpr *duration_expr;
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AVPacket *prev_inpkt;
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AVPacket *prev_outpkt;
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AVPacket *cur_pkt;
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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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s->prev_inpkt = av_packet_alloc();
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s->prev_outpkt = av_packet_alloc();
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s->cur_pkt = av_packet_alloc();
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if (!s->prev_inpkt || !s->prev_outpkt || !s->cur_pkt)
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return AVERROR(ENOMEM);
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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 ((ret = av_expr_parse(&s->duration_expr, s->duration_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 duration expression '%s'\n", s->duration_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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if (s->time_base.num > 0 && s->time_base.den > 0)
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ctx->time_base_out = s->time_base;
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s->frame_number= 0;
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s->var_values[VAR_STARTPTS] = AV_NOPTS_VALUE;
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s->var_values[VAR_STARTDTS] = AV_NOPTS_VALUE;
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s->var_values[VAR_NOPTS] = AV_NOPTS_VALUE;
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s->var_values[VAR_TB] = ctx->time_base_in.den ? av_q2d(ctx->time_base_in) : 0;
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s->var_values[VAR_TB_OUT]= ctx->time_base_out.den ? av_q2d(ctx->time_base_out) : 0;
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s->var_values[VAR_SR] = ctx->par_in->sample_rate;
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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, new_duration;
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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 && (ret != AVERROR_EOF || !s->cur_pkt->data))
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return ret;
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if (!s->cur_pkt->data) {
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av_packet_move_ref(s->cur_pkt, pkt);
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return AVERROR(EAGAIN);
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}
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if (s->var_values[VAR_STARTPTS] == AV_NOPTS_VALUE)
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s->var_values[VAR_STARTPTS] = s->cur_pkt->pts;
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if (s->var_values[VAR_STARTDTS] == AV_NOPTS_VALUE)
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s->var_values[VAR_STARTDTS] = s->cur_pkt->dts;
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s->var_values[VAR_N] = s->frame_number++;
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s->var_values[VAR_TS] = s->cur_pkt->dts;
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s->var_values[VAR_POS] = s->cur_pkt->pos;
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s->var_values[VAR_PTS] = s->cur_pkt->pts;
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s->var_values[VAR_DTS] = s->cur_pkt->dts;
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s->var_values[VAR_DURATION] = s->cur_pkt->duration;
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s->var_values[VAR_PREV_INPTS] = s->prev_inpkt->pts;
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s->var_values[VAR_PREV_INDTS] = s->prev_inpkt->dts;
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s->var_values[VAR_PREV_INDUR] = s->prev_inpkt->duration;
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s->var_values[VAR_PREV_OUTPTS] = s->prev_outpkt->pts;
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s->var_values[VAR_PREV_OUTDTS] = s->prev_outpkt->dts;
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s->var_values[VAR_PREV_OUTDUR] = s->prev_outpkt->duration;
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s->var_values[VAR_NEXT_PTS] = pkt->pts;
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s->var_values[VAR_NEXT_DTS] = pkt->dts;
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s->var_values[VAR_NEXT_DUR] = pkt->duration;
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new_ts = llrint(av_expr_eval(s->ts_expr, s->var_values, NULL));
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new_duration = llrint(av_expr_eval(s->duration_expr, s->var_values, NULL));
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if (s->pts_str) {
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s->var_values[VAR_TS] = s->cur_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] = s->cur_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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av_packet_unref(s->prev_inpkt);
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av_packet_unref(s->prev_outpkt);
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av_packet_move_ref(s->prev_inpkt, s->cur_pkt);
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av_packet_move_ref(s->cur_pkt, pkt);
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ret = av_packet_ref(pkt, s->prev_inpkt);
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if (ret < 0)
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return ret;
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pkt->pts = new_pts;
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pkt->dts = new_dts;
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pkt->duration = new_duration;
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ret = av_packet_ref(s->prev_outpkt, pkt);
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if (ret < 0)
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av_packet_unref(pkt);
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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_packet_free(&s->prev_inpkt);
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av_packet_free(&s->prev_outpkt);
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av_packet_free(&s->cur_pkt);
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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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av_expr_free(s->duration_expr);
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s->duration_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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{ "duration", "set expression for packet duration", OFFSET(duration_str), AV_OPT_TYPE_STRING, {.str="DURATION"}, 0, 0, FLAGS },
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{ "time_base", "set output timebase", OFFSET(time_base), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, 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 FFBitStreamFilter ff_setts_bsf = {
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.p.name = "setts",
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.p.priv_class = &setts_class,
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.priv_data_size = sizeof(SetTSContext),
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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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