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Sun, 12 Sep 2021 03:22:00 +0000 From: Soft Works To: "ffmpeg-devel@ffmpeg.org" Thread-Topic: [PATCH v5 10/12] avfilter/textmod: Add textmod filter Thread-Index: AQHXp4VZP+/AoDMGh0qlZlcupmM3Xg== Date: Sun, 12 Sep 2021 03:22:00 +0000 Message-ID: References: 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: [TqHUk2YIZELO0PodEXUVBZGqXLIN26fNMGDksUii7OM=] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 6ea88129-f2c8-4ef0-3e96-08d9759c7c20 x-ms-traffictypediagnostic: MN2PR04MB5728: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: Jq1MI/CjrQ+jpRv1Kfw0WkdN/1Vm7qys7983n/k1bY+r42yEdoSjruNZ7gU7Mq9RxCIKkgS2BkbOMrXRR5EA7UDnR5Rtszb4M0Our2JQ8Z7HgRASTqLx/d2BaL0Q8jgw1qL3pdTxyrDX74Ly7ZaGyslR/NB3V1J6SldxAPX9XhMtEUX1WCEWRcj8G0WuZRGtLhpYRl/0ntMYCzNNqnNqZgz1eEr7eChEgkrCr0w3QYF7guPiNOqJuuX7VMyyenrvztu53xga8KIKdT+KiwZG2G7oBTFQmg1pvM9KOcTJCyuU+T0M4BifgO+bRiA5kjsYs/4sYpzvs/oI+v4ww+VCjMU2iGkodEO0oCRKI0z/UIsQ4ZxWUye0jcStqs4QeKQs2JZatJW7aCYYT2+qZ4eWK8pZJpOUiyaukU2ZFUFTeGKeo0yP35TWowa3pOt6SBm8eM+GL9P8o6WMNR5EokP32akhWbKHNTOCiAYHKp0gZD8= x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: OGanyo/foTtDmN0xZbajC/dBsgcdwmk0pvTEEiqWgRqxl1cidEiHeipuV2v4rXrvEL7/cq14/Te2KYwzdyyFIe3KdhvHPeMNq6L35o20WlZ+XTleJL937MmHUYyMlWRUzPWgoHKeeIuxm9lXcv4w3g== 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: 6ea88129-f2c8-4ef0-3e96-08d9759c7c20 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Sep 2021 03:22:00.6142 (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: MN2PR04MB5728 Subject: [FFmpeg-devel] [PATCH v5 10/12] avfilter/textmod: Add textmod 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: FBrrG6uJ5SOr Signed-off-by: softworkz --- doc/filters.texi | 64 +++++++ libavfilter/Makefile | 3 + libavfilter/allfilters.c | 1 + libavfilter/sf_textmod.c | 381 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 449 insertions(+) create mode 100644 libavfilter/sf_textmod.c diff --git a/doc/filters.texi b/doc/filters.texi index 1d76461ada..9fd2876d63 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -25024,6 +25024,70 @@ existing filters using @code{--disable-filters}. Below is a description of the currently available subtitle filters. +@section textmod + +Modify subtitle text in a number of ways. + +It accepts the following parameters: + +@table @option +@item mode +The kind of text modification to apply + +Supported operation modes are: + +@table @var +@item 0, leet +Convert subtitle text to 'leet speak'. It's primarily useful for testing as the modification will be visible with almost all text lines. +@item 1, to_upper +Change all text to upper case. Might improve readability. +@item 2, to_lower +Change all text to lower case. +@item 3, replace_chars +Replace one or more characters. Requires the find and replace parameters to be specified. +Both need to be equal in length. +The first char in find is replaced by the first char in replace, same for all subsequent chars. +@item 4, remove_chars +Remove certain characters. Requires the find parameter to be specified. +All chars in the find parameter string will be removed from all subtitle text. +@item 5, replace_words +Replace one or more words. Requires the find and replace parameters to be specified. Multiple words must be separated by the delimiter char specified vie the separator parameter (default: ','). +The number of words in the find and replace parameters needs to be equal. +The first word in find is replaced by the first word in replace, same for all subsequent words +@item 6, remove_words +Remove certain words. Requires the find parameter to be specified. Multiple words must be separated by the delimiter char specified vie the separator parameter (default: ','). +All words in the find parameter string will be removed from all subtitle text. +@end table + +@item find +Required for replace_chars, remove_chars, replace_words and remove_words. + +@item replace +Required for replace_chars and replace_words. + +@item separator +Delimiter character for words. Used with replace_words and remove_words- Must be a single character. +The default is '.'. + +@end table + +@subsection Examples + +@itemize +@item +Change all characters to upper case while keeping all styles and animations: +@example +ffmpeg -i "https://streams.videolan.org/ffmpeg/mkv_subtitles.mkv" -filter_complex "[0:s]textmod=mode=to_upper" -map 0 -y out.mkv +@end example +@item +Mark the 100-pixel-wide region on the left edge of the frame as very +uninteresting (to be encoded at much lower quality than the rest of +the frame). +@example +addroi=0:0:100:ih:+1/5 +@end example +@end itemize + @section graphicsub2video Renders graphic subtitles as video frames. diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 0e752c5bf9..5a5a4be47e 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -534,6 +534,9 @@ OBJS-$(CONFIG_YUVTESTSRC_FILTER) += vsrc_testsrc.o OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o +# subtitle filters +OBJS-$(CONFIG_TEXTMOD_FILTER) += sf_textmod.o + # multimedia filters OBJS-$(CONFIG_ABITSCOPE_FILTER) += avf_abitscope.o OBJS-$(CONFIG_ADRAWGRAPH_FILTER) += f_drawgraph.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index 77463aa4c8..6d7a535ee8 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -524,6 +524,7 @@ extern const AVFilter ff_avf_showvolume; extern const AVFilter ff_avf_showwaves; extern const AVFilter ff_avf_showwavespic; extern const AVFilter ff_vaf_spectrumsynth; +extern const AVFilter ff_sf_textmod; extern const AVFilter ff_svf_graphicsub2video; extern const AVFilter ff_svf_textsub2video; diff --git a/libavfilter/sf_textmod.c b/libavfilter/sf_textmod.c new file mode 100644 index 0000000000..7c23ded9ef --- /dev/null +++ b/libavfilter/sf_textmod.c @@ -0,0 +1,381 @@ +/* + * 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 allows to modify subtitle text in several ways + */ + +#include + +#include "libavutil/avassert.h" +#include "libavutil/avstring.h" +#include "libavutil/opt.h" +#include "avfilter.h" +#include "internal.h" +#include "libavcodec/avcodec.h" +#include "libavcodec/ass_split.h" + +static const char* leet_src = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; +static const char* leet_dst = "abcd3f6#1jklmn0pq257uvwxyzAB(D3F6#1JKLMN0PQ257UVWXYZ"; + +enum TextModOperation { + OP_LEET, + OP_TO_UPPER, + OP_TO_LOWER, + OP_REPLACE_CHARS, + OP_REMOVE_CHARS, + OP_REPLACE_WORDS, + OP_REMOVE_WORDS, + NB_OPS, +}; + +typedef struct TextModContext { + const AVClass *class; + enum AVSubtitleType format; + enum TextModOperation operation; + char *find; + char *replace; + char *separator; + char **find_list; + int nb_find_list; + char **replace_list; + int nb_replace_list; +} TextModContext; + +static char **split_string(char *source, int *nb_elems, char delim) +{ + char **list = NULL; + char *temp = NULL; + char *ptr = av_strtok(source, &delim, &temp); + + while (ptr) { + av_dynarray_add(&list, nb_elems, ptr); + if (!list) + return NULL; + + ptr = av_strtok(NULL, &delim, &temp); + } + + av_dynarray_add(&list, nb_elems, NULL); + + return list; +} + +static int init(AVFilterContext *ctx) +{ + TextModContext *s = ctx->priv; + + switch (s->operation) { + case OP_REPLACE_CHARS: + case OP_REMOVE_CHARS: + case OP_REPLACE_WORDS: + case OP_REMOVE_WORDS: + if (!s->find || !strlen(s->find)) { + av_log(ctx, AV_LOG_ERROR, "Selected mode requires the 'find' parameter to be specified"); + return AVERROR(EINVAL); + } + break; + } + + switch (s->operation) { + case OP_REPLACE_CHARS: + case OP_REPLACE_WORDS: + if (!s->replace || !strlen(s->replace)) { + av_log(ctx, AV_LOG_ERROR, "Selected mode requires the 'replace' parameter to be specified"); + return AVERROR(EINVAL); + } + break; + } + + if (s->operation == OP_REPLACE_CHARS && strlen(s->find) != strlen(s->replace)) { + av_log(ctx, AV_LOG_ERROR, "Selected mode requires the 'find' and 'replace' parameters to have the same length"); + return AVERROR(EINVAL); + } + + if (s->operation == OP_REPLACE_WORDS || s->operation == OP_REMOVE_WORDS) { + if (!s->separator || strlen(s->separator) != 1) { + av_log(ctx, AV_LOG_ERROR, "Selected mode requires a single separator char to be specified"); + return AVERROR(EINVAL); + } + + s->find_list = split_string(s->find, &s->nb_find_list, *s->separator); + if (!s->find_list) + return AVERROR(ENOMEM); + + if (s->operation == OP_REPLACE_WORDS) { + + s->replace_list = split_string(s->replace, &s->nb_replace_list, *s->separator); + if (!s->replace_list) + return AVERROR(ENOMEM); + + if (s->nb_find_list != s->nb_replace_list) { + av_log(ctx, AV_LOG_ERROR, "The number of words in 'find' and 'replace' needs to be equal"); + return AVERROR(EINVAL); + } + } + } + + return 0; +} + +static void uninit(AVFilterContext *ctx) +{ + TextModContext *s = ctx->priv; + int i; + + for (i = 0; i < s->nb_find_list; i++) { + av_free(&s->find_list[i]); + } + s->nb_find_list = 0; + av_freep(&s->find_list); + + for (i = 0; i < s->nb_replace_list; i++) { + av_free(&s->replace_list[i]); + } + s->nb_replace_list = 0; + av_freep(&s->replace_list); +} + +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 *process_text(TextModContext *s, char *text) +{ + const char *char_src = s->find; + const char *char_dst = s->replace; + char *result = NULL; + int escape_level = 0, k = 0; + + switch (s->operation) { + case OP_LEET: + case OP_REPLACE_CHARS: + + if (s->operation == OP_LEET) { + char_src = leet_src; + char_dst = leet_dst; + } + + result = av_strdup(text); + if (!result) + return NULL; + + for (size_t n = 0; n < strlen(result); n++) { + if (result[n] == '{') + escape_level++; + + if (!escape_level) { + for (size_t t = 0; t < FF_ARRAY_ELEMS(char_src); t++) { + if (result[n] == char_src[t]) { + result[n] = char_dst[t]; + break; + } + } + } + + if (result[n] == '}') + escape_level--; + } + + break; + case OP_TO_UPPER: + case OP_TO_LOWER: + + result = av_strdup(text); + if (!result) + return NULL; + + for (size_t n = 0; n < strlen(result); n++) { + if (result[n] == '{') + escape_level++; + if (!escape_level) + result[n] = s->operation == OP_TO_LOWER ? av_tolower(result[n]) : av_toupper(result[n]); + if (result[n] == '}') + escape_level--; + } + + break; + case OP_REMOVE_CHARS: + + result = av_strdup(text); + if (!result) + return NULL; + + for (size_t n = 0; n < strlen(result); n++) { + int skip_char = 0; + + if (result[n] == '{') + escape_level++; + + if (!escape_level) { + for (size_t t = 0; t < FF_ARRAY_ELEMS(char_src); t++) { + if (result[n] == char_src[t]) { + skip_char = 1; + break; + } + } + } + + if (!skip_char) + result[k++] = result[n]; + + if (result[n] == '}') + escape_level--; + } + + result[k] = 0; + + break; + case OP_REPLACE_WORDS: + case OP_REMOVE_WORDS: + + result = av_strdup(text); + if (!result) + return NULL; + + for (int n = 0; n < s->nb_find_list; n++) { + char *tmp = result; + const char *replace = (s->operation == OP_REPLACE_WORDS) ? s->replace_list[n] : ""; + + result = av_strireplace(result, s->find_list[n], replace); + if (!result) + return NULL; + + av_free(tmp); + } + + break; + } + + return result; +} + +static char *process_dialog(TextModContext *s, char *ass_line) +{ + ASSDialog *dialog = ff_ass_split_dialog(NULL, ass_line); + char *result, *text; + + if (!dialog) + return NULL; + + text = process_text(s, dialog->text); + if (!text) + return NULL; + + result = ff_ass_get_dialog(dialog->readorder, dialog->layer, dialog->style, dialog->name, text); + + av_free(text); + ff_ass_free_dialog(&dialog); + return result; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *src_frame) +{ + TextModContext *s = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + int ret; + AVFrame *out; + + outlink->format = inlink->format; + + out = av_frame_clone(src_frame); + if (!out) + return AVERROR(ENOMEM); + + for (unsigned i = 0; i < out->num_subtitle_rects; i++) { + + AVSubtitleRect *rect = out->subtitle_rects[i]; + + if (rect->ass) { + char *tmp = rect->ass; + rect->ass = process_dialog(s, rect->ass); + av_free(tmp); + if (!rect->ass) + return AVERROR(ENOMEM); + } + } + + av_frame_free(&src_frame); + return ff_filter_frame(outlink, out); +} + +#define OFFSET(x) offsetof(TextModContext, x) +#define FLAGS (AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_FILTERING_PARAM) + +static const AVOption textmod_options[] = { + { "mode", "set operation mode", OFFSET(operation), AV_OPT_TYPE_INT, {.i64=OP_LEET}, OP_LEET, NB_OPS-1, FLAGS, "mode" }, + { "leet", "convert text to 'leet speak'", 0, AV_OPT_TYPE_CONST, {.i64=OP_LEET}, 0, 0, FLAGS, "mode" }, + { "to_upper", "change to upper case", 0, AV_OPT_TYPE_CONST, {.i64=OP_TO_UPPER}, 0, 0, FLAGS, "mode" }, + { "to_lower", "change to lower case", 0, AV_OPT_TYPE_CONST, {.i64=OP_TO_LOWER}, 0, 0, FLAGS, "mode" }, + { "replace_chars", "replace characters", 0, AV_OPT_TYPE_CONST, {.i64=OP_REPLACE_CHARS}, 0, 0, FLAGS, "mode" }, + { "remove_chars", "remove characters", 0, AV_OPT_TYPE_CONST, {.i64=OP_REMOVE_CHARS}, 0, 0, FLAGS, "mode" }, + { "replace_words", "replace words", 0, AV_OPT_TYPE_CONST, {.i64=OP_REPLACE_WORDS}, 0, 0, FLAGS, "mode" }, + { "remove_words", "remove words", 0, AV_OPT_TYPE_CONST, {.i64=OP_REMOVE_WORDS}, 0, 0, FLAGS, "mode" }, + { "find", "chars/words to find or remove", OFFSET(find), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS, NULL }, + { "replace", "chars/words to replace", OFFSET(replace), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS, NULL }, + { "separator", "word separator (default: ',')", OFFSET(separator), AV_OPT_TYPE_STRING, {.str = ","}, 0, 0, FLAGS, NULL }, + { NULL }, +}; + +AVFILTER_DEFINE_CLASS(textmod); + +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_textmod = { + .name = "textmod", + .description = NULL_IF_CONFIG_SMALL("Modify subtitle text in several ways"), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .priv_size = sizeof(TextModContext), + .priv_class = &textmod_class, + FILTER_INPUTS(inputs), + FILTER_OUTPUTS(outputs), +};