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[71.105.132.214]) by smtp.gmail.com with ESMTPSA id z13-20020ad4414d000000b005dd8b9345d8sm1405143qvp.112.2023.04.07.14.03.04 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 Apr 2023 14:03:04 -0700 (PDT) From: Devin Heitmueller X-Google-Original-From: Devin Heitmueller To: ffmpeg-devel@ffmpeg.org Date: Fri, 7 Apr 2023 17:58:29 -0400 Message-Id: <1680904709-25951-6-git-send-email-dheitmueller@ltnglobal.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1680904709-25951-1-git-send-email-dheitmueller@ltnglobal.com> References: <1680904709-25951-1-git-send-email-dheitmueller@ltnglobal.com> Subject: [FFmpeg-devel] [PATCH v2 5/5] vf_ccrepack: Add new filter to repack CEA-708 side data X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 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 Cc: Devin Heitmueller MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: 4r/X4VXLBNtP THis filter can correct certain issues seen from upstream sources where the cc_count is not properly set or the CEA-608 tuples are not at the start of the payload as expected. Make use of the ccfifo to extract and immediately repack the CEA-708 side data, thereby removing any extra padding and ensuring the 608 tuples are at the front of the payload. Signed-off-by: Devin Heitmueller --- doc/filters.texi | 10 +++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/vf_ccrepack.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 112 insertions(+) create mode 100644 libavfilter/vf_ccrepack.c diff --git a/doc/filters.texi b/doc/filters.texi index 120fe66..e72e73d 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -8930,6 +8930,16 @@ Only deinterlace frames marked as interlaced. The default value is @code{all}. @end table +@section ccrepack + +Repack CEA-708 closed captioning side data + +This filter fixes various issues seen with commerical encoders +related to upstream malformed CEA-708 payloads, specifically +incorrect number of tuples (wrong cc_count for the target FPS), +and incorrect ordering of tuples (i.e. the CEA-608 tuples are not at +the first entries in the payload). + @section cas Apply Contrast Adaptive Sharpen filter to video stream. diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 628ade8..3d0b3ad 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -212,6 +212,7 @@ OBJS-$(CONFIG_BOXBLUR_OPENCL_FILTER) += vf_avgblur_opencl.o opencl.o \ opencl/avgblur.o boxblur.o OBJS-$(CONFIG_BWDIF_FILTER) += vf_bwdif.o yadif_common.o OBJS-$(CONFIG_CAS_FILTER) += vf_cas.o +OBJS-$(CONFIG_CCREPACK_FILTER) += vf_ccrepack.o OBJS-$(CONFIG_CHROMABER_VULKAN_FILTER) += vf_chromaber_vulkan.o vulkan.o vulkan_filter.o OBJS-$(CONFIG_CHROMAHOLD_FILTER) += vf_chromakey.o OBJS-$(CONFIG_CHROMAKEY_FILTER) += vf_chromakey.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index d7db46c..b38550b 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -196,6 +196,7 @@ extern const AVFilter ff_vf_boxblur; extern const AVFilter ff_vf_boxblur_opencl; extern const AVFilter ff_vf_bwdif; extern const AVFilter ff_vf_cas; +extern const AVFilter ff_vf_ccrepack; extern const AVFilter ff_vf_chromaber_vulkan; extern const AVFilter ff_vf_chromahold; extern const AVFilter ff_vf_chromakey; diff --git a/libavfilter/vf_ccrepack.c b/libavfilter/vf_ccrepack.c new file mode 100644 index 0000000..063c360 --- /dev/null +++ b/libavfilter/vf_ccrepack.c @@ -0,0 +1,100 @@ +/* + * CEA-708 Closed Caption Repacker + * Copyright (c) 2023 LTN Global Communications + * + * Author: Devin Heitmueller + * + * 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 + */ + +/* + * Repackage CEA-708 arrays, which deals with incorrect cc_count for a given + * output framerate, and incorrect 708 padding. + * + * See CEA CEA-10-A "EIA-708-B Implementation Guidance", Section 26.5 + * "Grouping DTVCC Data Within user_data() Structure" + */ + +#include "avfilter.h" +#include "internal.h" +#include "ccfifo.h" +#include "libavutil/opt.h" + +typedef struct CCRepackContext +{ + const AVClass *class; + AVCCFifo *cc_fifo; +} CCRepackContext; + +static const AVOption ccrepack_options[] = { + { NULL } +}; + +AVFILTER_DEFINE_CLASS(ccrepack); + +static int config_input(AVFilterLink *link) +{ + CCRepackContext *ctx = link->dst->priv; + + if (!(ctx->cc_fifo = av_ccfifo_alloc(&link->frame_rate, ctx))) + av_log(ctx, AV_LOG_VERBOSE, "Failure to setup CC FIFO queue. Captions will be passed through\n"); + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *frame) +{ + CCRepackContext *ctx = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + + av_ccfifo_extract(ctx->cc_fifo, frame); + av_ccfifo_inject(ctx->cc_fifo, frame); + + return ff_filter_frame(outlink, frame); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + CCRepackContext *s = ctx->priv; + av_ccfifo_freep(&s->cc_fifo); +} + +static const AVFilterPad avfilter_vf_ccrepack_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, +}; + +static const AVFilterPad avfilter_vf_ccrepack_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, +}; + +AVFilter ff_vf_ccrepack = { + .name = "ccrepack", + .description = NULL_IF_CONFIG_SMALL("Repack CEA-708 closed caption metadata"), + .uninit = uninit, + .priv_size = sizeof(CCRepackContext), + .priv_class = &ccrepack_class, + FILTER_INPUTS(avfilter_vf_ccrepack_inputs), + FILTER_OUTPUTS(avfilter_vf_ccrepack_outputs), +};