From patchwork Sat Apr 18 14:25:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stebbins X-Patchwork-Id: 19053 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 04C6C44A224 for ; Sat, 18 Apr 2020 17:26:20 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id DEBC968B1AA; Sat, 18 Apr 2020 17:26:19 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail.jetheaddev.com (mail.jetheaddev.com [70.164.99.34]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 4C78A68BC38 for ; Sat, 18 Apr 2020 17:26:13 +0300 (EEST) Received: from creator.alpe-d-promontory.fun (192.168.13.165) by cas.jetheaddev.com (192.168.13.27) with Microsoft SMTP Server (TLS) id 14.3.351.0; Sat, 18 Apr 2020 07:26:11 -0700 From: John Stebbins To: Date: Sat, 18 Apr 2020 08:25:43 -0600 Message-ID: <20200418142547.21299-2-jstebbins@jetheaddev.com> X-Mailer: git-send-email 2.25.2 In-Reply-To: <20200418142547.21299-1-jstebbins@jetheaddev.com> References: <20200418142547.21299-1-jstebbins@jetheaddev.com> MIME-Version: 1.0 X-Originating-IP: [192.168.13.165] Subject: [FFmpeg-devel] [PATCH 1/4] lavc/pgs_frame_merge_bsf: add bsf to merge PGS segments X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Required to remux m2ts to mkv --- Changelog | 1 + doc/bitstream_filters.texi | 8 ++ libavcodec/Makefile | 1 + libavcodec/bitstream_filters.c | 1 + libavcodec/pgs_frame_merge_bsf.c | 168 +++++++++++++++++++++++++++++++ 5 files changed, 179 insertions(+) create mode 100644 libavcodec/pgs_frame_merge_bsf.c diff --git a/Changelog b/Changelog index d9fcd8bb0a..fec4867488 100644 --- a/Changelog +++ b/Changelog @@ -59,6 +59,7 @@ version : - mv30 decoder - Expanded styling support for 3GPP Timed Text Subtitles (movtext) - WebP parser +- PGS subtitle frame merge bitstream filter version 4.2: diff --git a/doc/bitstream_filters.texi b/doc/bitstream_filters.texi index 8fe5b3ad75..21ed09986c 100644 --- a/doc/bitstream_filters.texi +++ b/doc/bitstream_filters.texi @@ -548,6 +548,14 @@ ffmpeg -i INPUT -c copy -bsf noise[=1] output.mkv @section null This bitstream filter passes the packets through unchanged. +@section pgs_frame_merge + +Merge a sequence of PGS Subtitle segments ending with an "end of display set" +segment into a single packet. + +This is required by some containers that support PGS subtitles +(muxer @code{matroska}). + @section prores_metadata Modify color property metadata embedded in prores stream. diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 88944d9a3a..b630de21bc 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -1115,6 +1115,7 @@ OBJS-$(CONFIG_MP3_HEADER_DECOMPRESS_BSF) += mp3_header_decompress_bsf.o \ OBJS-$(CONFIG_MPEG2_METADATA_BSF) += mpeg2_metadata_bsf.o OBJS-$(CONFIG_NOISE_BSF) += noise_bsf.o OBJS-$(CONFIG_NULL_BSF) += null_bsf.o +OBJS-$(CONFIG_PGS_FRAME_MERGE_BSF) += pgs_frame_merge_bsf.o OBJS-$(CONFIG_PRORES_METADATA_BSF) += prores_metadata_bsf.o OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o diff --git a/libavcodec/bitstream_filters.c b/libavcodec/bitstream_filters.c index 6b5ffe4d70..92619225f0 100644 --- a/libavcodec/bitstream_filters.c +++ b/libavcodec/bitstream_filters.c @@ -49,6 +49,7 @@ extern const AVBitStreamFilter ff_mpeg4_unpack_bframes_bsf; extern const AVBitStreamFilter ff_mov2textsub_bsf; extern const AVBitStreamFilter ff_noise_bsf; extern const AVBitStreamFilter ff_null_bsf; +extern const AVBitStreamFilter ff_pgs_frame_merge_bsf; extern const AVBitStreamFilter ff_prores_metadata_bsf; extern const AVBitStreamFilter ff_remove_extradata_bsf; extern const AVBitStreamFilter ff_text2movsub_bsf; diff --git a/libavcodec/pgs_frame_merge_bsf.c b/libavcodec/pgs_frame_merge_bsf.c new file mode 100644 index 0000000000..cae5c75655 --- /dev/null +++ b/libavcodec/pgs_frame_merge_bsf.c @@ -0,0 +1,168 @@ +/* + * Copyright (c) 2020 John Stebbins + * + * 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 merges PGS subtitle packets containing incomplete + * set of segments into a single packet + * + * Packets already containing a complete set of segments will be passed through + * unchanged. + */ + +#include "avcodec.h" +#include "bsf.h" +#include "libavutil/intreadwrite.h" + +enum PGSSegmentType { + PALETTE_SEGMENT = 0x14, + OBJECT_SEGMENT = 0x15, + PRESENTATION_SEGMENT = 0x16, + WINDOW_SEGMENT = 0x17, + DISPLAY_SEGMENT = 0x80, +}; + +typedef struct PGSMergeContext { + AVPacket *buffer_pkt, *in; + int presentation_found; +} PGSMergeContext; + +static void frame_merge_flush(AVBSFContext *bsf) +{ + PGSMergeContext *ctx = bsf->priv_data; + + av_packet_unref(ctx->in); + av_packet_unref(ctx->buffer_pkt); +} + +static int frame_merge_filter(AVBSFContext *bsf, AVPacket *out) +{ + PGSMergeContext *ctx = bsf->priv_data; + AVPacket *in = ctx->in, *pkt = ctx->buffer_pkt; + int ret, i, size, pos, display = 0; + + if (!in->data) { + ret = ff_bsf_get_packet_ref(bsf, in); + if (ret < 0) + return ret; + } + if (!in->size) { + av_packet_unref(in); + return AVERROR(EAGAIN); + } + + // Validate packet data and find display_end segment + size = in->size; + i = 0; + while (i + 3 <= in->size) { + uint8_t segment_type; + int segment_len; + + segment_type = in->data[i]; + segment_len = AV_RB16(in->data + i + 1) + 3; + if (i + segment_len > in->size) // Invalid data + break; + if (segment_type == PRESENTATION_SEGMENT && i + 10 < in->size && + !ctx->presentation_found) { + uint8_t state; + ctx->presentation_found = 1; + ret = av_packet_copy_props(pkt, in); + if (ret < 0) + goto fail; + state = in->data[i + 10] & 0xc0; + if (state) + pkt->flags |= AV_PKT_FLAG_KEY; + } + i += segment_len; + if (segment_type == DISPLAY_SEGMENT) { + size = display = i; + break; + } + } + if (display && pkt->size == 0 && size == in->size) { // passthrough + ctx->presentation_found = 0; + av_packet_move_ref(out, in); + return 0; + } + if ((!display && i != in->size) || size > in->size) { + av_log(bsf, AV_LOG_WARNING, "Failed to parse PGS segments.\n"); + // force output what we have + display = size = in->size; + } + + pos = pkt->size; + ret = av_grow_packet(pkt, size); + if (ret < 0) + goto fail; + memcpy(pkt->data + pos, in->data, size); + + if (size == in->size) + av_packet_unref(in); + else { + in->data += size; + in->size -= size; + } + + if (display) { + ctx->presentation_found = 0; + av_packet_move_ref(out, pkt); + return 0; + } + return AVERROR(EAGAIN); + +fail: + ctx->presentation_found = 0; + frame_merge_flush(bsf); + return ret; +} + +static int frame_merge_init(AVBSFContext *bsf) +{ + PGSMergeContext *ctx = bsf->priv_data; + + ctx->in = av_packet_alloc(); + ctx->buffer_pkt = av_packet_alloc(); + if (!ctx->in || !ctx->buffer_pkt) + return AVERROR(ENOMEM); + + return 0; +} + +static void frame_merge_close(AVBSFContext *bsf) +{ + PGSMergeContext *ctx = bsf->priv_data; + + av_packet_free(&ctx->in); + av_packet_free(&ctx->buffer_pkt); +} + +static const enum AVCodecID frame_merge_codec_ids[] = { + AV_CODEC_ID_HDMV_PGS_SUBTITLE, AV_CODEC_ID_NONE, +}; + +const AVBitStreamFilter ff_pgs_frame_merge_bsf = { + .name = "pgs_frame_merge", + .priv_data_size = sizeof(PGSMergeContext), + .init = frame_merge_init, + .flush = frame_merge_flush, + .close = frame_merge_close, + .filter = frame_merge_filter, + .codec_ids = frame_merge_codec_ids, +};