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- /*
- * Copyright (c) 2011 Baptiste Coudurier
- * Copyright (c) 2011 Stefano Sabatini
- * Copyright (c) 2012 Clément Bœsch
- *
- * 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
- * Libass subtitles burning filter.
- *
- * @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
- */
- #include <ass/ass.h>
- #include "config.h"
- #if CONFIG_SUBTITLES_FILTER
- # include "libavcodec/avcodec.h"
- # include "libavformat/avformat.h"
- #endif
- #include "libavutil/avstring.h"
- #include "libavutil/imgutils.h"
- #include "libavutil/opt.h"
- #include "libavutil/parseutils.h"
- #include "drawutils.h"
- #include "avfilter.h"
- #include "internal.h"
- #include "formats.h"
- #include "video.h"
- typedef struct {
- const AVClass *class;
- ASS_Library *library;
- ASS_Renderer *renderer;
- ASS_Track *track;
- char *filename;
- char *fontsdir;
- char *charenc;
- char *force_style;
- int stream_index;
- uint8_t rgba_map[4];
- int pix_step[4]; ///< steps per pixel for each plane of the main output
- int original_w, original_h;
- int shaping;
- FFDrawContext draw;
- } AssContext;
- #define OFFSET(x) offsetof(AssContext, x)
- #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
- #define COMMON_OPTIONS \
- {"filename", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \
- {"f", "set the filename of file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \
- {"original_size", "set the size of the original video (used to scale fonts)", OFFSET(original_w), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \
- {"fontsdir", "set the directory containing the fonts to read", OFFSET(fontsdir), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS }, \
- /* libass supports a log level ranging from 0 to 7 */
- static const int ass_libavfilter_log_level_map[] = {
- [0] = AV_LOG_FATAL, /* MSGL_FATAL */
- [1] = AV_LOG_ERROR, /* MSGL_ERR */
- [2] = AV_LOG_WARNING, /* MSGL_WARN */
- [3] = AV_LOG_WARNING, /* <undefined> */
- [4] = AV_LOG_INFO, /* MSGL_INFO */
- [5] = AV_LOG_INFO, /* <undefined> */
- [6] = AV_LOG_VERBOSE, /* MSGL_V */
- [7] = AV_LOG_DEBUG, /* MSGL_DBG2 */
- };
- static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
- {
- const int ass_level_clip = av_clip(ass_level, 0,
- FF_ARRAY_ELEMS(ass_libavfilter_log_level_map) - 1);
- const int level = ass_libavfilter_log_level_map[ass_level_clip];
- av_vlog(ctx, level, fmt, args);
- av_log(ctx, level, "\n");
- }
- static av_cold int init(AVFilterContext *ctx)
- {
- AssContext *ass = ctx->priv;
- if (!ass->filename) {
- av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
- return AVERROR(EINVAL);
- }
- ass->library = ass_library_init();
- if (!ass->library) {
- av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
- return AVERROR(EINVAL);
- }
- ass_set_message_cb(ass->library, ass_log, ctx);
- ass_set_fonts_dir(ass->library, ass->fontsdir);
- ass->renderer = ass_renderer_init(ass->library);
- if (!ass->renderer) {
- av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
- return AVERROR(EINVAL);
- }
- return 0;
- }
- static av_cold void uninit(AVFilterContext *ctx)
- {
- AssContext *ass = ctx->priv;
- if (ass->track)
- ass_free_track(ass->track);
- if (ass->renderer)
- ass_renderer_done(ass->renderer);
- if (ass->library)
- ass_library_done(ass->library);
- }
- static int query_formats(AVFilterContext *ctx)
- {
- return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
- }
- static int config_input(AVFilterLink *inlink)
- {
- AssContext *ass = inlink->dst->priv;
- ff_draw_init(&ass->draw, inlink->format, 0);
- ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
- if (ass->original_w && ass->original_h)
- ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
- (double)ass->original_w / ass->original_h);
- if (ass->shaping != -1)
- ass_set_shaper(ass->renderer, ass->shaping);
- return 0;
- }
- /* libass stores an RGBA color in the format RRGGBBTT, where TT is the transparency level */
- #define AR(c) ( (c)>>24)
- #define AG(c) (((c)>>16)&0xFF)
- #define AB(c) (((c)>>8) &0xFF)
- #define AA(c) ((0xFF-(c)) &0xFF)
- static void overlay_ass_image(AssContext *ass, AVFrame *picref,
- const ASS_Image *image)
- {
- for (; image; image = image->next) {
- uint8_t rgba_color[] = {AR(image->color), AG(image->color), AB(image->color), AA(image->color)};
- FFDrawColor color;
- ff_draw_color(&ass->draw, &color, rgba_color);
- ff_blend_mask(&ass->draw, &color,
- picref->data, picref->linesize,
- picref->width, picref->height,
- image->bitmap, image->stride, image->w, image->h,
- 3, 0, image->dst_x, image->dst_y);
- }
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- AssContext *ass = ctx->priv;
- int detect_change = 0;
- double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
- ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
- time_ms, &detect_change);
- if (detect_change)
- av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
- overlay_ass_image(ass, picref, image);
- return ff_filter_frame(outlink, picref);
- }
- static const AVFilterPad ass_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .filter_frame = filter_frame,
- .config_props = config_input,
- .needs_writable = 1,
- },
- { NULL }
- };
- static const AVFilterPad ass_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- },
- { NULL }
- };
- #if CONFIG_ASS_FILTER
- static const AVOption ass_options[] = {
- COMMON_OPTIONS
- {"shaping", "set shaping engine", OFFSET(shaping), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, FLAGS, "shaping_mode"},
- {"auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = -1}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {"simple", "simple shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_SIMPLE}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {"complex", "complex shaping", 0, AV_OPT_TYPE_CONST, {.i64 = ASS_SHAPING_COMPLEX}, INT_MIN, INT_MAX, FLAGS, "shaping_mode"},
- {NULL},
- };
- AVFILTER_DEFINE_CLASS(ass);
- static av_cold int init_ass(AVFilterContext *ctx)
- {
- AssContext *ass = ctx->priv;
- int ret = init(ctx);
- if (ret < 0)
- return ret;
- /* Initialize fonts */
- ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
- ass->track = ass_read_file(ass->library, ass->filename, NULL);
- if (!ass->track) {
- av_log(ctx, AV_LOG_ERROR,
- "Could not create a libass track when reading file '%s'\n",
- ass->filename);
- return AVERROR(EINVAL);
- }
- return 0;
- }
- AVFilter ff_vf_ass = {
- .name = "ass",
- .description = NULL_IF_CONFIG_SMALL("Render ASS subtitles onto input video using the libass library."),
- .priv_size = sizeof(AssContext),
- .init = init_ass,
- .uninit = uninit,
- .query_formats = query_formats,
- .inputs = ass_inputs,
- .outputs = ass_outputs,
- .priv_class = &ass_class,
- };
- #endif
- #if CONFIG_SUBTITLES_FILTER
- static const AVOption subtitles_options[] = {
- COMMON_OPTIONS
- {"charenc", "set input character encoding", OFFSET(charenc), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
- {"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
- {"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS},
- {"force_style", "force subtitle style", OFFSET(force_style), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
- {NULL},
- };
- static const char * const font_mimetypes[] = {
- "application/x-truetype-font",
- "application/vnd.ms-opentype",
- "application/x-font-ttf",
- NULL
- };
- static int attachment_is_font(AVStream * st)
- {
- const AVDictionaryEntry *tag = NULL;
- int n;
- tag = av_dict_get(st->metadata, "mimetype", NULL, AV_DICT_MATCH_CASE);
- if (tag) {
- for (n = 0; font_mimetypes[n]; n++) {
- if (av_strcasecmp(font_mimetypes[n], tag->value) == 0)
- return 1;
- }
- }
- return 0;
- }
- AVFILTER_DEFINE_CLASS(subtitles);
- static av_cold int init_subtitles(AVFilterContext *ctx)
- {
- int j, ret, sid;
- int k = 0;
- AVDictionary *codec_opts = NULL;
- AVFormatContext *fmt = NULL;
- AVCodecContext *dec_ctx = NULL;
- AVCodec *dec = NULL;
- const AVCodecDescriptor *dec_desc;
- AVStream *st;
- AVPacket pkt;
- AssContext *ass = ctx->priv;
- /* Init libass */
- ret = init(ctx);
- if (ret < 0)
- return ret;
- ass->track = ass_new_track(ass->library);
- if (!ass->track) {
- av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
- return AVERROR(EINVAL);
- }
- /* Open subtitles file */
- ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
- if (ret < 0) {
- av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
- goto end;
- }
- ret = avformat_find_stream_info(fmt, NULL);
- if (ret < 0)
- goto end;
- /* Locate subtitles stream */
- if (ass->stream_index < 0)
- ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
- else {
- ret = -1;
- if (ass->stream_index < fmt->nb_streams) {
- for (j = 0; j < fmt->nb_streams; j++) {
- if (fmt->streams[j]->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
- if (ass->stream_index == k) {
- ret = j;
- break;
- }
- k++;
- }
- }
- }
- }
- if (ret < 0) {
- av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
- ass->filename);
- goto end;
- }
- sid = ret;
- st = fmt->streams[sid];
- /* Load attached fonts */
- for (j = 0; j < fmt->nb_streams; j++) {
- AVStream *st = fmt->streams[j];
- if (st->codec->codec_type == AVMEDIA_TYPE_ATTACHMENT &&
- attachment_is_font(st)) {
- const AVDictionaryEntry *tag = NULL;
- tag = av_dict_get(st->metadata, "filename", NULL,
- AV_DICT_MATCH_CASE);
- if (tag) {
- av_log(ctx, AV_LOG_DEBUG, "Loading attached font: %s\n",
- tag->value);
- ass_add_font(ass->library, tag->value,
- st->codec->extradata,
- st->codec->extradata_size);
- } else {
- av_log(ctx, AV_LOG_WARNING,
- "Font attachment has no filename, ignored.\n");
- }
- }
- }
- /* Initialize fonts */
- ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
- /* Open decoder */
- dec_ctx = st->codec;
- dec = avcodec_find_decoder(dec_ctx->codec_id);
- if (!dec) {
- av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
- avcodec_get_name(dec_ctx->codec_id));
- return AVERROR(EINVAL);
- }
- dec_desc = avcodec_descriptor_get(dec_ctx->codec_id);
- if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
- av_log(ctx, AV_LOG_ERROR,
- "Only text based subtitles are currently supported\n");
- return AVERROR_PATCHWELCOME;
- }
- if (ass->charenc)
- av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
- ret = avcodec_open2(dec_ctx, dec, &codec_opts);
- if (ret < 0)
- goto end;
- if (ass->force_style) {
- char **list = NULL;
- char *temp = NULL;
- char *ptr = av_strtok(ass->force_style, ",", &temp);
- int i = 0;
- while (ptr) {
- av_dynarray_add(&list, &i, ptr);
- if (!list) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- ptr = av_strtok(NULL, ",", &temp);
- }
- av_dynarray_add(&list, &i, NULL);
- if (!list) {
- ret = AVERROR(ENOMEM);
- goto end;
- }
- ass_set_style_overrides(ass->library, list);
- av_free(list);
- }
- /* Decode subtitles and push them into the renderer (libass) */
- if (dec_ctx->subtitle_header)
- ass_process_codec_private(ass->track,
- dec_ctx->subtitle_header,
- dec_ctx->subtitle_header_size);
- av_init_packet(&pkt);
- pkt.data = NULL;
- pkt.size = 0;
- while (av_read_frame(fmt, &pkt) >= 0) {
- int i, got_subtitle;
- AVSubtitle sub = {0};
- if (pkt.stream_index == sid) {
- ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
- if (ret < 0) {
- av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
- av_err2str(ret));
- } else if (got_subtitle) {
- for (i = 0; i < sub.num_rects; i++) {
- char *ass_line = sub.rects[i]->ass;
- if (!ass_line)
- break;
- ass_process_data(ass->track, ass_line, strlen(ass_line));
- }
- }
- }
- av_packet_unref(&pkt);
- avsubtitle_free(&sub);
- }
- end:
- av_dict_free(&codec_opts);
- if (dec_ctx)
- avcodec_close(dec_ctx);
- if (fmt)
- avformat_close_input(&fmt);
- return ret;
- }
- AVFilter ff_vf_subtitles = {
- .name = "subtitles",
- .description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input video using the libass library."),
- .priv_size = sizeof(AssContext),
- .init = init_subtitles,
- .uninit = uninit,
- .query_formats = query_formats,
- .inputs = ass_inputs,
- .outputs = ass_outputs,
- .priv_class = &subtitles_class,
- };
- #endif
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