367 lines
11 KiB
C
367 lines
11 KiB
C
/*
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* Copyright (c) 2011 Baptiste Coudurier
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2012 Clément Bœsch
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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 "config.h"
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#if CONFIG_SUBTITLES_FILTER
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# include "libavcodec/avcodec.h"
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# include "libavformat/avformat.h"
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#endif
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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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char *charenc;
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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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#define COMMON_OPTIONS \
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{"filename", "set the filename of 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 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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/* 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)
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{
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AssContext *ass = ctx->priv;
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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_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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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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/* 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, AVFrame *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->width, picref->height,
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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 filter_frame(AVFilterLink *inlink, AVFrame *picref)
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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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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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return ff_filter_frame(outlink, picref);
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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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.filter_frame = filter_frame,
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.config_props = config_input,
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.needs_writable = 1,
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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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#if CONFIG_ASS_FILTER
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static const AVOption ass_options[] = {
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COMMON_OPTIONS
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(ass);
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static av_cold int init_ass(AVFilterContext *ctx)
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{
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AssContext *ass = ctx->priv;
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int ret = init(ctx);
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if (ret < 0)
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return ret;
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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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return 0;
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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 ASS subtitles onto input video using the libass library."),
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.priv_size = sizeof(AssContext),
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.init = init_ass,
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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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#endif
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#if CONFIG_SUBTITLES_FILTER
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static const AVOption subtitles_options[] = {
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COMMON_OPTIONS
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{"charenc", "set input character encoding", OFFSET(charenc), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(subtitles);
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static av_cold int init_subtitles(AVFilterContext *ctx)
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{
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int ret, sid;
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AVDictionary *codec_opts = NULL;
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AVFormatContext *fmt = NULL;
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AVCodecContext *dec_ctx = NULL;
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AVCodec *dec = NULL;
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const AVCodecDescriptor *dec_desc;
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AVStream *st;
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AVPacket pkt;
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AssContext *ass = ctx->priv;
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/* Init libass */
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ret = init(ctx);
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if (ret < 0)
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return ret;
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ass->track = ass_new_track(ass->library);
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if (!ass->track) {
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av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
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return AVERROR(EINVAL);
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}
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/* Open subtitles file */
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ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
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goto end;
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}
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ret = avformat_find_stream_info(fmt, NULL);
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if (ret < 0)
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goto end;
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/* Locate subtitles stream */
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ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
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ass->filename);
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goto end;
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}
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sid = ret;
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st = fmt->streams[sid];
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/* Open decoder */
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dec_ctx = st->codec;
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dec = avcodec_find_decoder(dec_ctx->codec_id);
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if (!dec) {
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av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
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avcodec_get_name(dec_ctx->codec_id));
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return AVERROR(EINVAL);
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}
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dec_desc = avcodec_descriptor_get(dec_ctx->codec_id);
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if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
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av_log(ctx, AV_LOG_ERROR,
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"Only text based subtitles are currently supported\n");
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return AVERROR_PATCHWELCOME;
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}
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if (ass->charenc)
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av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
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ret = avcodec_open2(dec_ctx, dec, &codec_opts);
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if (ret < 0)
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goto end;
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/* Decode subtitles and push them into the renderer (libass) */
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if (dec_ctx->subtitle_header)
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ass_process_codec_private(ass->track,
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dec_ctx->subtitle_header,
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dec_ctx->subtitle_header_size);
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av_init_packet(&pkt);
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pkt.data = NULL;
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pkt.size = 0;
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while (av_read_frame(fmt, &pkt) >= 0) {
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int i, got_subtitle;
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AVSubtitle sub;
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if (pkt.stream_index == sid) {
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ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
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if (ret < 0) {
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av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
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av_err2str(ret));
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} else if (got_subtitle) {
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for (i = 0; i < sub.num_rects; i++) {
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char *ass_line = sub.rects[i]->ass;
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if (!ass_line)
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break;
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ass_process_data(ass->track, ass_line, strlen(ass_line));
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}
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}
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}
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av_free_packet(&pkt);
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avsubtitle_free(&sub);
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}
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end:
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av_dict_free(&codec_opts);
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if (dec_ctx)
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avcodec_close(dec_ctx);
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if (fmt)
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avformat_close_input(&fmt);
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return ret;
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}
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AVFilter avfilter_vf_subtitles = {
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.name = "subtitles",
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.description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input video using the libass library."),
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.priv_size = sizeof(AssContext),
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.init = init_subtitles,
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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 = &subtitles_class,
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};
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#endif
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