236 lines
7.4 KiB
C
236 lines
7.4 KiB
C
/*
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* Copyright (c) 2011 Baptiste Coudurier
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* Copyright (c) 2011 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Libass subtitles burning filter.
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*
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* @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
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*/
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#include <ass/ass.h>
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#include "libavutil/avstring.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "drawutils.h"
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#include "avfilter.h"
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#include "internal.h"
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#include "formats.h"
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#include "video.h"
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typedef struct {
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const AVClass *class;
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ASS_Library *library;
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ASS_Renderer *renderer;
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ASS_Track *track;
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char *filename;
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uint8_t rgba_map[4];
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int pix_step[4]; ///< steps per pixel for each plane of the main output
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int original_w, original_h;
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FFDrawContext draw;
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} AssContext;
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#define OFFSET(x) offsetof(AssContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption ass_options[] = {
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{"filename", "set the filename of the ASS file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{"f", "set the filename of the ASS file to read", OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{"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 },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(ass);
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/* libass supports a log level ranging from 0 to 7 */
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static const int ass_libavfilter_log_level_map[] = {
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AV_LOG_QUIET, /* 0 */
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AV_LOG_PANIC, /* 1 */
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AV_LOG_FATAL, /* 2 */
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AV_LOG_ERROR, /* 3 */
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AV_LOG_WARNING, /* 4 */
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AV_LOG_INFO, /* 5 */
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AV_LOG_VERBOSE, /* 6 */
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AV_LOG_DEBUG, /* 7 */
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};
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static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
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{
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int level = ass_libavfilter_log_level_map[ass_level];
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av_vlog(ctx, level, fmt, args);
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av_log(ctx, level, "\n");
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}
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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AssContext *ass = ctx->priv;
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static const char *shorthand[] = { "filename", NULL };
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int ret;
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ass->class = &ass_class;
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av_opt_set_defaults(ass);
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if ((ret = av_opt_set_from_string(ass, args, shorthand, "=", ":")) < 0)
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return ret;
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if (!ass->filename) {
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av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
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return AVERROR(EINVAL);
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}
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ass->library = ass_library_init();
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if (!ass->library) {
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av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
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return AVERROR(EINVAL);
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}
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ass_set_message_cb(ass->library, ass_log, ctx);
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ass->renderer = ass_renderer_init(ass->library);
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if (!ass->renderer) {
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av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
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return AVERROR(EINVAL);
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}
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ass->track = ass_read_file(ass->library, ass->filename, NULL);
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if (!ass->track) {
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av_log(ctx, AV_LOG_ERROR,
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"Could not create a libass track when reading file '%s'\n",
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ass->filename);
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return AVERROR(EINVAL);
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}
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ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AssContext *ass = ctx->priv;
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av_opt_free(ass);
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if (ass->track)
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ass_free_track(ass->track);
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if (ass->renderer)
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ass_renderer_done(ass->renderer);
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if (ass->library)
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ass_library_done(ass->library);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AssContext *ass = inlink->dst->priv;
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ff_draw_init(&ass->draw, inlink->format, 0);
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ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
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if (ass->original_w && ass->original_h)
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ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
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(double)ass->original_w / ass->original_h);
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return 0;
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}
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static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; }
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/* libass stores an RGBA color in the format RRGGBBTT, where TT is the transparency level */
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#define AR(c) ( (c)>>24)
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#define AG(c) (((c)>>16)&0xFF)
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#define AB(c) (((c)>>8) &0xFF)
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#define AA(c) ((0xFF-c) &0xFF)
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static void overlay_ass_image(AssContext *ass, AVFilterBufferRef *picref,
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const ASS_Image *image)
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{
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for (; image; image = image->next) {
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uint8_t rgba_color[] = {AR(image->color), AG(image->color), AB(image->color), AA(image->color)};
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FFDrawColor color;
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ff_draw_color(&ass->draw, &color, rgba_color);
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ff_blend_mask(&ass->draw, &color,
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picref->data, picref->linesize,
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picref->video->w, picref->video->h,
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image->bitmap, image->stride, image->w, image->h,
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3, 0, image->dst_x, image->dst_y);
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}
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}
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static int end_frame(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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AVFilterLink *outlink = ctx->outputs[0];
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AssContext *ass = ctx->priv;
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AVFilterBufferRef *picref = inlink->cur_buf;
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int detect_change = 0;
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double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
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ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
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time_ms, &detect_change);
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if (detect_change)
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av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
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overlay_ass_image(ass, picref, image);
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ff_draw_slice(outlink, 0, picref->video->h, 1);
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return ff_end_frame(outlink);
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}
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static const AVFilterPad ass_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = ff_null_get_video_buffer,
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.start_frame = ff_null_start_frame,
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.draw_slice = null_draw_slice,
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.end_frame = end_frame,
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.config_props = config_input,
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.min_perms = AV_PERM_WRITE | AV_PERM_READ,
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},
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{ NULL }
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};
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static const AVFilterPad ass_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_ass = {
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.name = "ass",
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.description = NULL_IF_CONFIG_SMALL("Render subtitles onto input video using the libass library."),
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.priv_size = sizeof(AssContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = ass_inputs,
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.outputs = ass_outputs,
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.priv_class = &ass_class,
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};
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