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Tue, 21 Sep 2021 23:54:54 +0000 From: Soft Works To: "ffmpeg-devel@ffmpeg.org" Thread-Topic: [PATCH v8 11/13] avfilter/stripstyles: Add stripstyles filter Thread-Index: AQHXr0QTVj368VEZwUGxsSB+4Md3FA== Date: Tue, 21 Sep 2021 23:54:54 +0000 Message-ID: References: <2f4d7190c46bde35cfef16e74900bd11a42856a8.1632266268.git.softworkz@hotmail.com> <4855e43e9cec16b6fa4db8991ddba687b5b90517.1632266268.git.softworkz@hotmail.com> <9b2d5f77fd58279aa3bcfe53e9a211f7d088213a.1632266268.git.softworkz@hotmail.com> <0b57654b386ea5a47dff24924c5ba2a8a3ae3f12.1632266268.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: [vAiN+gjutcrnXeJ4gytEEqqm6/YY2AYx] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e3085433-a933-4b47-9f00-08d97d5b35e2 x-ms-traffictypediagnostic: MN2PR04MB5520: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: iazi1ZKWyDXcWbTnE6mP1faLpMktINYjS/0Cy5HezUqIokcs6ykmIUwa23lmxXsvZbjxamdghol+YVhqRs0+cBjD6pKQjgbygcEF42wvaDv0CeMTXej3p2rSZCks2No4Xa9ZdAVCiqMcZa49hZrqlh19b1zdTjSl9b8tCb/NqZ2Euw+YbTqhGD0sgRMxiDtJT832Z8WII1Se+bWPvWJj69JayOIhx4/o13rizWXc1Jgr5uJDyCnR8Dg0cKwm/YqPhALIpcJjjOaeBIj4+LkcD+Xh9FGf19wjV4nnajL/Ee7XaaF6mxLXH2eregv4i49XA+AH6/sJB0ya/FREl1dnLoBKVwVgw0LJY1EDA6CmlEoblXIaHcZHyLH0peKst+6FOR9DcgfF2vziDroPbHpBC32rCcEYwPJUSjD4eAGlYZ9NmoBKDeLaP7ur5x+Cph+M x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: 6ZQ14dF5pNtCUxpUzJEdfgAP2iXHj8i+7KSB7k/Uev6gV9WtNxxpj6uOyOcCoLbO7qniaog60YORyXsMLDLRrDeF9eVpZCd4NX+wbiWP3gNNV7qErZ4a66ohkqCtD7I4XvUP8huQHeXkB15iNy9vog== x-ms-exchange-transport-forked: True MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3174-20-msonline-outlook-529c7.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR04MB5981.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: e3085433-a933-4b47-9f00-08d97d5b35e2 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Sep 2021 23:54:54.8256 (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: MN2PR04MB5520 Subject: [FFmpeg-devel] [PATCH v8 11/13] avfilter/stripstyles: Add stripstyles filter 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: eg7uBioi0kn2 - stripstyles {S -> S) Remove all inline styles from subtitle events Signed-off-by: softworkz --- libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/sf_stripstyles.c | 211 +++++++++++++++++++++++++++++++++++ 3 files changed, 213 insertions(+) create mode 100644 libavfilter/sf_stripstyles.c diff --git a/libavfilter/Makefile b/libavfilter/Makefile index e6fef97c08..309c404bf7 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -540,6 +540,7 @@ 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-$(CONFIG_STRIPSTYLES_FILTER) += sf_stripstyles.o # multimedia filters OBJS-$(CONFIG_ABITSCOPE_FILTER) += avf_abitscope.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index fc72858d18..e2e4deea22 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -528,6 +528,7 @@ extern const AVFilter ff_avf_showwavespic; extern const AVFilter ff_vaf_spectrumsynth; extern const AVFilter ff_sf_censor; extern const AVFilter ff_sf_show_speaker; +extern const AVFilter ff_sf_stripstyles; extern const AVFilter ff_sf_textmod; extern const AVFilter ff_svf_graphicsub2video; extern const AVFilter ff_svf_textsub2video; diff --git a/libavfilter/sf_stripstyles.c b/libavfilter/sf_stripstyles.c new file mode 100644 index 0000000000..15c00e73b1 --- /dev/null +++ b/libavfilter/sf_stripstyles.c @@ -0,0 +1,211 @@ +/* + * 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 + * text subtitle filter which removes inline-styles from subtitles + */ + +#include + +#include "libavutil/avassert.h" +#include "libavutil/opt.h" +#include "avfilter.h" +#include "internal.h" +#include "libavcodec/avcodec.h" +#include "libavcodec/ass_split.h" + +typedef struct StripStylesContext { + const AVClass *class; + enum AVSubtitleType format; + int remove_animated; +} StripStylesContext; + +typedef struct DialogContext { + const AVClass *class; + const StripStylesContext* ss_ctx; + AVBPrint buffer; + int drawing_scale; + int is_animated; +} DialogContext; + +static void dialog_text_cb(void *priv, const char *text, int len) +{ + DialogContext *s = priv; + if (!s->drawing_scale && (!s->is_animated || !s->ss_ctx->remove_animated)) + av_bprint_append_data(&s->buffer, text, len); +} + +static void dialog_new_line_cb(void *priv, int forced) +{ + DialogContext *s = priv; + if (!s->drawing_scale && !s->is_animated) + av_bprint_append_data(&s->buffer, forced ? "\\N" : "\\n", 2); +} + +static void dialog_drawing_mode_cb(void *priv, int scale) +{ + DialogContext *s = priv; + s->drawing_scale = scale; +} + +static void dialog_animate_cb(void *priv, int t1, int t2, int accel, char *style) +{ + DialogContext *s = priv; + s->is_animated = 1; +} + +static void dialog_move_cb(void *priv, int x1, int y1, int x2, int y2, int t1, int t2) +{ + DialogContext *s = priv; + if (t1 >= 0 || t2 >= 0) + s->is_animated = 1; +} + +static const ASSCodesCallbacks dialog_callbacks = { + .text = dialog_text_cb, + .new_line = dialog_new_line_cb, + .drawing_mode = dialog_drawing_mode_cb, + .animate = dialog_animate_cb, + .move = dialog_move_cb, +}; + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats; + AVFilterLink *inlink = ctx->inputs[0]; + AVFilterLink *outlink = ctx->outputs[0]; + static const enum AVSubtitleType subtitle_fmts[] = { AV_SUBTITLE_FMT_ASS, AV_SUBTITLE_FMT_NONE }; + int ret; + + /* set input subtitle format */ + formats = ff_make_format_list(subtitle_fmts); + if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0) + return ret; + + /* set output video format */ + if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0) + return ret; + + return 0; +} + +static char *ass_get_line(int readorder, int layer, const char *style, + const char *speaker, const char *effect, const char *text) +{ + return av_asprintf("%d,%d,%s,%s,0,0,0,%s,%s", + readorder, layer, style ? style : "Default", + speaker ? speaker : "", effect, text); +} + +static char *process_dialog(StripStylesContext *s, const char *ass_line) +{ + ASSDialog *dialog = ff_ass_split_dialog(NULL, ass_line); + char *result = NULL, *text; + DialogContext dlg_ctx = { 0 }; + + if (!dialog) + return NULL; + + dlg_ctx.ss_ctx = s; + + av_bprint_init(&dlg_ctx.buffer, 0, AV_BPRINT_SIZE_UNLIMITED); + + ff_ass_split_override_codes(&dialog_callbacks, &dlg_ctx, dialog->text); + + av_bprint_finalize(&dlg_ctx.buffer, &text); + + if (text && strlen(text) > 0) + result = ass_get_line(dialog->readorder, dialog->layer, dialog->style, dialog->name, dialog->effect, text); + + av_free(text); + ff_ass_free_dialog(&dialog); + + return result; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *frame) +{ + StripStylesContext *s = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + + outlink->format = inlink->format; + + av_frame_make_writable(frame); + if (!frame) + return AVERROR(ENOMEM); + + for (unsigned i = 0; i < frame->num_subtitle_areas; i++) { + + AVSubtitleArea *area = frame->subtitle_areas[i]; + + if (area->ass) { + char *tmp = area->ass; + area->ass = process_dialog(s, area->ass); + + if (area->ass) { + av_log(inlink->dst, AV_LOG_DEBUG, "original: %s\n", tmp); + av_log(inlink->dst, AV_LOG_DEBUG, "stripped: %s\n", area->ass); + } + else + area->ass = av_strdup(""); + + av_free(tmp); + } + } + + return ff_filter_frame(outlink, frame); +} + +#define OFFSET(x) offsetof(StripStylesContext, x) +#define FLAGS (AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_FILTERING_PARAM) + +static const AVOption stripstyles_options[] = { + { "remove_animated", "remove animated text (default: yes)", OFFSET(remove_animated), AV_OPT_TYPE_BOOL, {.i64 = 1 }, 0, 1, FLAGS, 0 }, + { NULL }, +}; + +AVFILTER_DEFINE_CLASS(stripstyles); + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_SUBTITLE, + .filter_frame = filter_frame, + }, +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_SUBTITLE, + }, +}; + +const AVFilter ff_sf_stripstyles = { + .name = "stripstyles", + .description = NULL_IF_CONFIG_SMALL("Strip subtitle inline styles"), + .query_formats = query_formats, + .priv_size = sizeof(StripStylesContext), + .priv_class = &stripstyles_class, + FILTER_INPUTS(inputs), + FILTER_OUTPUTS(outputs), +}; +