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Thu, 25 Nov 2021 17:54:05 +0000 From: Soft Works To: "ffmpeg-devel@ffmpeg.org" Thread-Topic: [PATCH v16 12/16] avfilter/splitcc: Add splitcc filter for closed caption handling Thread-Index: AQHX4iVwDXvgaQLN3USg9bV4TVdv0A== Date: Thu, 25 Nov 2021 17:54:05 +0000 Message-ID: References: <4b9347bd2083dd36cab996aa68083e6aed364d2e.1637862494.git.softworkz@hotmail.com> <1c7eb4cba1a1d30c8848d81bda779ac5fa1533be.1637862494.git.softworkz@hotmail.com> <699ba39485ee5f5be1db4749ffaabcb638e89215.1637862494.git.softworkz@hotmail.com> <6a6111595c87f35e641247d206fb4e7c750b50e5.1637862494.git.softworkz@hotmail.com> <801cb88ec4d8e13577428e6e95fd4763ea076b74.1637862494.git.softworkz@hotmail.com> <7c67cedc4aa815c256d86e9bbbf5eb6e7811cf07.1637862494.git.softworkz@hotmail.com> <789dc21a843bcfff91b16a445ef8cd7fd219c6ef.1637862494.git.softworkz@hotmail.com> <8f4b4e3092b608c05e887969d0f2795295f4f178.1637862494.git.softworkz@hotmail.com> <5df678d79e524f7ec78ae5632f5bdef917d646a1.1637862494.git.softworkz@hotmail.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [b+kMtu1Pn6mv97qX4Ef/kTfybB1Bfh5c] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b9b544ff-030b-44f1-726a-08d9b03c92c0 x-ms-traffictypediagnostic: DM8P223MB0112: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: 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 MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3912-16-msonline-outlook-1fc6d.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM8P223MB0365.NAMP223.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: b9b544ff-030b-44f1-726a-08d9b03c92c0 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Nov 2021 17:54:05.5740 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8P223MB0112 Subject: [FFmpeg-devel] [PATCH v16 12/16] avfilter/splitcc: Add splitcc filter for closed caption handling 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 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: UMmujJQ6os8S - splitcc {V -> VS) Extract closed-caption (A53) data from video frames as subtitle Frames ffmpeg -y -loglevel verbose -i "https://streams.videolan.org/streams/ts/CC/NewsStream-608-ac3.ts" -filter_complex "[0:v]splitcc[vid1],textmod=mode=remove_chars:find='@',[vid1]overlay_textsubs" output.mkv Signed-off-by: softworkz --- configure | 1 + doc/filters.texi | 63 ++++++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/sf_splitcc.c | 316 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 382 insertions(+) create mode 100644 libavfilter/sf_splitcc.c diff --git a/configure b/configure index db1db0a0a6..bcd7102e6c 100755 --- a/configure +++ b/configure @@ -3680,6 +3680,7 @@ spp_filter_select="fft idctdsp fdctdsp me_cmp pixblockdsp" sr_filter_deps="avformat swscale" sr_filter_select="dnn" stereo3d_filter_deps="gpl" +splitcc_filter_deps="avcodec" subtitles_filter_deps="avformat avcodec libass" super2xsai_filter_deps="gpl" pixfmts_super2xsai_test_deps="super2xsai_filter" diff --git a/doc/filters.texi b/doc/filters.texi index 0d6502f282..bb0e6c5add 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -25961,6 +25961,69 @@ ffmpeg -i INPUT -filter_complex "showspeaker=format=colon:style='@{\\c&HDD0000&\ @end example @end itemize + +@section splitcc + +Split-out closed-caption/A53 subtitles from video frame side data. + +This filter provides an input and an output for video frames, which are just passed through without modification. +The second out provides subtitle frames which are extracted from video frame side data. + +Inputs: +@itemize +@item 0: Video [ALL] +@end itemize + +Outputs: +@itemize +@item 0: Video (same as input) +@item 1: Subtitles [TEXT] +@end itemize + +It accepts the following parameters: + +@table @option + +@item use_cc_styles +Emit closed caption style header. +This will make closed captions appear in white font with a black rectangle background. + +@item real_time +Emit subtitle events as they are decoded for real-time display. + +@item real_time_latency_msec +Minimum elapsed time between emitting real-time subtitle events. +Only applies to real_time mode. + +@item data_field +Select data field. Possible values: + +@table @samp +@item auto +Pick first one that appears. +@item first +@item second +@end table + +@end table + +@subsection Examples + +@itemize +@item +Extract closed captions as text subtitle stream and overlay it onto the video in cc style (black bar background): +@example +ffmpeg -i "https://streams.videolan.org/streams/ts/CC/NewsStream-608-ac3.ts" -filter_complex "[0:v:0]splitcc=use_cc_styles=1[vid1][sub1];[vid1][sub1]overlaytextsubs" output.mkv +@end example + +@item +A nicer variant, using realtime output from cc_dec and rendering it with the render_latest_only parameter from overlaytextsubs to avoid ghosting by timely overlap. +@example +ffmpeg -i "https://streams.videolan.org/streams/ts/CC/NewsStream-608-ac3.ts" -filter_complex "[0:v:0]splitcc=real_time=1:real_time_latency_msec=200[vid1][sub1];[vid1][sub1]overlaytextsubs=render_latest_only=1" output.mkv +@end example +@end itemize + + @section textsub2video Converts text subtitles to video frames. diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 599ca0e54a..5364e11491 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -555,6 +555,7 @@ OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o OBJS-$(CONFIG_CENSOR_FILTER) += sf_textmod.o OBJS-$(CONFIG_SHOW_SPEAKER_FILTER) += sf_textmod.o OBJS-$(CONFIG_TEXTMOD_FILTER) += sf_textmod.o +OBJS-$(CONFIG_SPLITCC_FILTER) += sf_splitcc.o OBJS-$(CONFIG_STRIPSTYLES_FILTER) += sf_stripstyles.o # multimedia filters diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 378d1dcaac..1444ca873a 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -543,6 +543,7 @@ extern const AVFilter ff_avf_showwavespic; extern const AVFilter ff_vaf_spectrumsynth; extern const AVFilter ff_sf_censor; extern const AVFilter ff_sf_showspeaker; +extern const AVFilter ff_sf_splitcc; extern const AVFilter ff_sf_stripstyles; extern const AVFilter ff_sf_textmod; extern const AVFilter ff_svf_graphicsub2video; diff --git a/libavfilter/sf_splitcc.c b/libavfilter/sf_splitcc.c new file mode 100644 index 0000000000..0ebbd500f1 --- /dev/null +++ b/libavfilter/sf_splitcc.c @@ -0,0 +1,316 @@ +/* + * Copyright (c) 2021 softworkz + * + * 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 + * subtitle filter for splitting out closed-caption/A53 subtitles from video frame side data + */ + +#include "libavutil/opt.h" +#include "subtitles.h" +#include "libavcodec/avcodec.h" + +typedef struct SplitCaptionsContext { + const AVClass *class; + enum AVSubtitleType format; + AVCodecContext *cc_dec; + int eof; + AVFrame *next_sub_frame; + int new_frame; + AVBufferRef *subtitle_header; + int use_cc_styles; + int real_time; + int real_time_latency_msec; + int data_field; +} SplitCaptionsContext; + +static int init(AVFilterContext *ctx) +{ + SplitCaptionsContext *s = ctx->priv; + AVDictionary *options = NULL; + + int ret; + const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_EIA_608); + if (!codec) { + av_log(ctx, AV_LOG_ERROR, "failed to find EIA-608/708 decoder\n"); + return AVERROR_DECODER_NOT_FOUND; + } + + if (!((s->cc_dec = avcodec_alloc_context3(codec)))) { + av_log(ctx, AV_LOG_ERROR, "failed to allocate EIA-608/708 decoder\n"); + return AVERROR(ENOMEM); + } + + av_dict_set_int(&options, "real_time", s->real_time, 0); + av_dict_set_int(&options, "real_time_latency_msec", s->real_time_latency_msec, 0); + av_dict_set_int(&options, "data_field", s->data_field, 0); + + if ((ret = avcodec_open2(s->cc_dec, codec, &options)) < 0) { + av_log(ctx, AV_LOG_ERROR, "failed to open EIA-608/708 decoder: %i\n", ret); + return ret; + } + + if (s->use_cc_styles && s->cc_dec->subtitle_header && s->cc_dec->subtitle_header[0] != 0) { + char* subtitle_header = av_strdup((char *)s->cc_dec->subtitle_header); + if (!subtitle_header) + return AVERROR(ENOMEM); + s->subtitle_header = av_buffer_create((uint8_t *)subtitle_header, strlen(subtitle_header) + 1, NULL, NULL, 0); + if (!s->subtitle_header) { + av_free(subtitle_header); + return AVERROR(ENOMEM); + } + } + + return 0; +} + +static void uninit(AVFilterContext *ctx) +{ + SplitCaptionsContext *s = ctx->priv; + av_frame_free(&s->next_sub_frame); + av_buffer_unref(&s->subtitle_header); +} + +static int config_input(AVFilterLink *link) +{ + const SplitCaptionsContext *context = link->dst->priv; + + if (context->cc_dec) + context->cc_dec->pkt_timebase = link->time_base; + + return 0; +} + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats; + AVFilterLink *inlink0 = ctx->inputs[0]; + AVFilterLink *outlink0 = ctx->outputs[0]; + AVFilterLink *outlink1 = ctx->outputs[1]; + static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_ASS, AV_SUBTITLE_FMT_NB }; + int ret; + + /* set input0 video formats */ + formats = ff_all_formats(AVMEDIA_TYPE_VIDEO); + if ((ret = ff_formats_ref(formats, &inlink0->outcfg.formats)) < 0) + return ret; + + /* set output0 video formats */ + if ((ret = ff_formats_ref(formats, &outlink0->incfg.formats)) < 0) + return ret; + + /* set output1 subtitle formats */ + formats = ff_make_format_list(subtitle_fmts); + if ((ret = ff_formats_ref(formats, &outlink1->incfg.formats)) < 0) + return ret; + + return 0; +} + +static int config_sub_output(AVFilterLink *outlink) +{ + const AVFilterLink *inlink = outlink->src->inputs[0]; + + outlink->time_base = inlink->time_base; + outlink->format = AV_SUBTITLE_FMT_ASS; + + return 0; +} + +static int request_sub_frame(AVFilterLink *outlink) +{ + SplitCaptionsContext *s = outlink->src->priv; + + if (s->eof) + return AVERROR_EOF; + + if (s->next_sub_frame && s->new_frame) { + AVFrame *out; + s->next_sub_frame->pts++; + + out = av_frame_clone(s->next_sub_frame); + if (!out) + return AVERROR(ENOMEM); + + out->subtitle_pts = av_rescale_q(s->next_sub_frame->pts, outlink->time_base, AV_TIME_BASE_Q); + s->new_frame = 0; + + return ff_filter_frame(outlink, out); + } + + return 0; +} + +static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt) +{ + int ret; + + *got_frame = 0; + + if (pkt) { + ret = avcodec_send_packet(avctx, pkt); + // In particular, we don't expect AVERROR(EAGAIN), because we read all + // decoded frames with avcodec_receive_frame() until done. + if (ret < 0 && ret != AVERROR_EOF) + return ret; + } + + ret = avcodec_receive_frame(avctx, frame); + if (ret < 0 && ret != AVERROR(EAGAIN)) + return ret; + if (ret >= 0) + *got_frame = 1; + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *frame) +{ + AVFrameSideData *sd; + SplitCaptionsContext *s = inlink->dst->priv; + AVFilterLink *outlink0 = inlink->dst->outputs[0]; + AVFilterLink *outlink1 = inlink->dst->outputs[1]; + AVPacket *pkt; + AVFrame *sub_out; + + int ret; + + outlink0->format = inlink->format; + + sd = av_frame_get_side_data(frame, AV_FRAME_DATA_A53_CC); + + if (sd) { + int got_output = 0; + + pkt = av_packet_alloc(); + pkt->buf = av_buffer_ref(sd->buf); + if (!pkt->buf) { + ret = AVERROR(ENOMEM); + goto fail; + } + + pkt->data = sd->data; + pkt->size = (int)sd->size; + pkt->pts = frame->pts; + + sub_out = ff_get_subtitles_buffer(outlink1, AV_SUBTITLE_FMT_ASS); + if (!sub_out) { + ret = AVERROR(ENOMEM); + goto fail; + } + + if ((ret = av_buffer_replace(&sub_out->subtitle_header, s->subtitle_header)) < 0) + goto fail; + + ret = decode(s->cc_dec, sub_out, &got_output, pkt); + + if (ret < 0) + goto fail; + + if (got_output) { + sub_out->pts = frame->pts; + av_frame_free(&s->next_sub_frame); + s->next_sub_frame = sub_out; + sub_out = NULL; + s->new_frame = 1; + + if ((ret = av_buffer_replace(&s->next_sub_frame->subtitle_header, s->subtitle_header)) < 0) + goto fail; + + ret = request_sub_frame(outlink1); + if (ret < 0) + goto fail; + } + } + + if (!s->next_sub_frame) { + s->next_sub_frame = ff_get_subtitles_buffer(outlink1, outlink1->format); + if (!s->next_sub_frame) { + ret = AVERROR(ENOMEM); + goto fail; + } + + s->next_sub_frame->subtitle_end_time = 100; + s->next_sub_frame->pts = frame->pts; + s->new_frame = 1; + + if ((ret = av_buffer_replace(&s->next_sub_frame->subtitle_header, s->subtitle_header)) < 0) + goto fail; + } + else + s->next_sub_frame->pts = frame->pts; + + ret = ff_filter_frame(outlink0, frame); + +fail: + av_packet_free(&pkt); + av_frame_free(&sub_out); + return ret; +} + +#define OFFSET(x) offsetof(SplitCaptionsContext, x) +#define FLAGS (AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_FILTERING_PARAM) + +static const AVOption split_cc_options[] = { + { "use_cc_styles", "Emit closed caption style header", OFFSET(use_cc_styles), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS, NULL }, + { "real_time", "emit subtitle events as they are decoded for real-time display", OFFSET(real_time), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS }, + { "real_time_latency_msec", "minimum elapsed time between emitting real-time subtitle events", OFFSET(real_time_latency_msec), AV_OPT_TYPE_INT, { .i64 = 200 }, 0, 500, FLAGS }, + { "data_field", "select data field", OFFSET(data_field), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, FLAGS, "data_field" }, + { "auto", "pick first one that appears", 0, AV_OPT_TYPE_CONST, { .i64 =-1 }, 0, 0, FLAGS, "data_field" }, + { "first", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, 0, 0, FLAGS, "data_field" }, + { "second", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, "data_field" }, + { NULL }, +}; + +AVFILTER_DEFINE_CLASS(split_cc); + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, +}; + +static const AVFilterPad outputs[] = { + { + .name = "video_passthrough", + .type = AVMEDIA_TYPE_VIDEO, + }, + { + .name = "subtitles", + .type = AVMEDIA_TYPE_SUBTITLE, + .request_frame = request_sub_frame, + .config_props = config_sub_output, + }, +}; + +const AVFilter ff_sf_splitcc = { + .name = "splitcc", + .description = NULL_IF_CONFIG_SMALL("Extract closed-caption (A53) data from video as subtitle stream."), + .init = init, + .uninit = uninit, + .priv_size = sizeof(SplitCaptionsContext), + .priv_class = &split_cc_class, + FILTER_INPUTS(inputs), + FILTER_OUTPUTS(outputs), + FILTER_QUERY_FUNC(query_formats), +};