mirror of https://github.com/FFmpeg/FFmpeg.git
Stefano Sabatini
14 years ago
parent
31a1342e7a
commit
28338bc2a3
7 changed files with 268 additions and 2 deletions
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/*
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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/pixdesc.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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ASS_Library *library; |
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ASS_Renderer *renderer; |
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ASS_Track *track; |
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int hsub, vsub; |
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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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} AssContext; |
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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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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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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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static const enum PixelFormat pix_fmts[] = { |
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PIX_FMT_ARGB, PIX_FMT_RGBA, |
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PIX_FMT_ABGR, PIX_FMT_BGRA, |
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PIX_FMT_RGB24, PIX_FMT_BGR24, |
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PIX_FMT_NONE |
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}; |
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
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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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const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; |
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double sar = inlink->sample_aspect_ratio.num ? |
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av_q2d(inlink->sample_aspect_ratio) : 1; |
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double dar = inlink->w / inlink->h * sar; |
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av_image_fill_max_pixsteps(ass->pix_step, NULL, pix_desc); |
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ff_fill_rgba_map(ass->rgba_map, inlink->format); |
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ass->hsub = pix_desc->log2_chroma_w; |
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ass->vsub = pix_desc->log2_chroma_h; |
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ass_set_frame_size (ass->renderer, inlink->w, inlink->h); |
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ass_set_aspect_ratio(ass->renderer, dar, sar); |
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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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#define R 0 |
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#define G 1 |
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#define B 2 |
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#define A 3 |
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#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off) { \ |
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p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
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alpha = rgba_color[A] * (val) * 129; \
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*(p+r_off) = (alpha * rgba_color[R] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
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*(p+g_off) = (alpha * rgba_color[G] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
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*(p+b_off) = (alpha * rgba_color[B] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
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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(AVFilterBufferRef *picref, const uint8_t *rgba_map, const int pix_step, |
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const ASS_Image *image) |
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{ |
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int i, j; |
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int alpha; |
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uint8_t *p; |
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const int ro = rgba_map[R]; |
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const int go = rgba_map[G]; |
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const int bo = rgba_map[B]; |
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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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unsigned char *row = image->bitmap; |
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for (i = 0; i < image->h; i++) { |
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for (j = 0; j < image->w; j++) { |
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if (row[j]) { |
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SET_PIXEL_RGB(picref, rgba_color, row[j], image->dst_x + j, image->dst_y + i, pix_step, ro, go, bo); |
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} |
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} |
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row += image->stride; |
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} |
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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(picref, ass->rgba_map, ass->pix_step[0], 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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