4d6a8a2bdb
The function is modelled after av_default_item_name(), and will print the name of the instance filter if defined, otherwise the name of the filter. This allows to show the instance name in the log, which is useful when debugging complex filter graphs.
230 lines
7.1 KiB
C
230 lines
7.1 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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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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static const AVOption ass_options[] = {
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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 },
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{NULL},
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};
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static const AVClass ass_class = {
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"AssContext",
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avfilter_default_filter_name,
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ass_options
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};
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/* libass supports a log level ranging from 0 to 7 */
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int ass_libav_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_libav_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, void *opaque)
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{
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AssContext *ass = ctx->priv;
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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 (args)
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ass->filename = av_get_token(&args, ":");
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if (!ass->filename || !*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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if (*args++ == ':' && (ret = av_set_options_string(ass, args, "=", ":")) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
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return ret;
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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_freep(&ass->filename);
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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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avfilter_set_common_pixel_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 void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
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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 void 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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avfilter_draw_slice(outlink, 0, picref->video->h, 1);
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avfilter_end_frame(outlink);
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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 = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.get_video_buffer = avfilter_null_get_video_buffer,
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.start_frame = avfilter_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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.rej_perms = AV_PERM_PRESERVE },
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{ .name = NULL}
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO, },
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{ .name = NULL}
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},
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};
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