[FFmpeg-devel] libavcodec: add timeshift bitstream filter [v3]

Message ID	U7F4N-WTbw_wr2ajhVpHw2nRhvFZrm5FBFIMQ1BHg_jgXeNpO0b366cyrWUwXj3QlhPW9_7ZiVrcEh6KZJhzRwpltYwsyNTFNoOB7Tn48EI=@protonmail.com
State	New
Headers	show Return-Path: <ffmpeg-devel-bounces@ffmpeg.org> Date: Wed, 07 Aug 2019 15:51:21 +0000 To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> From: =?UTF-8?Q?Andreas_H=C3=A5kon?= <andreas.hakon@protonmail.com> Message-ID: <U7F4N-WTbw_wr2ajhVpHw2nRhvFZrm5FBFIMQ1BHg_jgXeNpO0b366cyrWUwXj3QlhPW9_7ZiVrcEh6KZJhzRwpltYwsyNTFNoOB7Tn48EI=@protonmail.com> Feedback-ID: Mx8CaiV20jk_fqXDN0fFpg3vRaGkb9VCTrYRnZNHwEija3aOdqvFspzl6ODkmHrlSKJSx29p-LzkuvS_96L02A==:Ext:ProtonMail MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="b1_4d68a57e3e65f8b454d2486970f921bf" Subject: [FFmpeg-devel] libavcodec: add timeshift bitstream filter [v3] Precedence: list Reply-To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org> Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" <ffmpeg-devel-bounces@ffmpeg.org>

diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi index 50a1679..f7fb0d4 100644 --- a/doc/bitstream_filters.texi +++ b/doc/bitstream_filters.texi @@ -644,6 +644,17 @@ codec) with metadata headers. See also the @ref{mov2textsub} filter. +@section timeshift + +Apply an offset to the PTS/DTS timestamps. + +@table @option +@item offset +The absolute offset value to apply to the PTS/DTS timestamps with a +90kHz resolution. + +@end table + @section trace_headers Log trace output containing all syntax elements in the coded stream diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 3cd73fb..e929a99 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -1096,6 +1096,7 @@ OBJS-$(CONFIG_NULL_BSF) += null_bsf.o OBJS-$(CONFIG_PRORES_METADATA_BSF) += prores_metadata_bsf.o OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o +OBJS-$(CONFIG_TIMESHIFT_BSF) += timeshift_bsf.o OBJS-$(CONFIG_TRACE_HEADERS_BSF) += trace_headers_bsf.o OBJS-$(CONFIG_TRUEHD_CORE_BSF) += truehd_core_bsf.o mlp_parse.o mlp.o OBJS-$(CONFIG_VP9_METADATA_BSF) += vp9_metadata_bsf.o diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c index 4630039..d728185 100644 --- a/libavcodec/bitstream_filters.c +++ b/libavcodec/bitstream_filters.c @@ -51,6 +51,7 @@ extern const AVBitStreamFilter ff_null_bsf; extern const AVBitStreamFilter ff_prores_metadata_bsf; extern const AVBitStreamFilter ff_remove_extradata_bsf; extern const AVBitStreamFilter ff_text2movsub_bsf; +extern const AVBitStreamFilter ff_timeshift_bsf; extern const AVBitStreamFilter ff_trace_headers_bsf; extern const AVBitStreamFilter ff_truehd_core_bsf; extern const AVBitStreamFilter ff_vp9_metadata_bsf; diff --git a/libavcodec/timeshift_bsf.c b/libavcodec/timeshift_bsf.c new file mode 100644 index 0000000..1af9152 --- /dev/null +++ b/libavcodec/timeshift_bsf.c @@ -0,0 +1,87 @@ +/* + * 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 + */ + +/** + * @file + * This bitstream filter applies an offset to the PTS/DTS timestamps. + * + */ + +#include "avcodec.h" +#include "bsf.h" + +#include "libavutil/opt.h" + +#define FILTER_MAX_PTS 0x200000000 // (2^33) + +typedef struct TimeshiftContext { + const AVClass *class; + int offset; + int first_debug_done; +} TimeshiftContext; + +static int timeshift_filter(AVBSFContext *ctx, AVPacket *pkt) +{ + int ret; + TimeshiftContext *s = ctx->priv_data; + int64_t opts,odts; + + ret = ff_bsf_get_packet_ref(ctx, pkt); + if (ret < 0) + return ret; + + opts = pkt->pts; + if (pkt->pts != AV_NOPTS_VALUE) { + pkt->pts += s->offset; + pkt->pts &= FILTER_MAX_PTS; + } + odts = pkt->dts; + if (pkt->dts != AV_NOPTS_VALUE) { + pkt->dts += s->offset; + pkt->pts &= FILTER_MAX_PTS; + } + + if (!s->first_debug_done) { + av_log(ctx, AV_LOG_DEBUG, "Updated PTS/DTS (%"PRId64"/%"PRId64" : %"PRId64"/%"PRId64") with offset:%d\n", + pkt->pts, pkt->dts, opts, odts, s->offset ); + s->first_debug_done = 1; + } + + return 0; +} + +#define OFFSET(x) offsetof(TimeshiftContext, x) +#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_BSF_PARAM) +static const AVOption options[] = { + { "offset", NULL, OFFSET(offset), AV_OPT_TYPE_INT64, { .i64 = 0 }, 1-FILTER_MAX_PTS, FILTER_MAX_PTS, FLAGS }, + { NULL }, +}; + +static const AVClass timeshift_class = { + .class_name = "timeshift_bsf", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +const AVBitStreamFilter ff_timeshift_bsf = { + .name = "timeshift", + .priv_data_size = sizeof(TimeshiftContext), + .priv_class = &timeshift_class, + .filter = timeshift_filter, +};

[FFmpeg-devel] libavcodec: add timeshift bitstream filter [v3]

Commit Message

Comments

Patch