mirror of https://git.ffmpeg.org/ffmpeg.git
lavfi: add libass based subtitles renderer
This commit is contained in:
Stefano Sabatini
parent
31a1342e7a
commit
28338bc2a3
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@ -124,6 +124,7 @@ easier to use. The changes are:
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- compact and csv output in ffprobe
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- pan audio filter
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- IFF Amiga Continuous Bitmap (ACBM) decoder
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- ass filter
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version 0.8:
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@ -168,6 +168,7 @@ External library support:
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--enable-frei0r enable frei0r video filtering
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--enable-gnutls enable gnutls [no]
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--enable-libaacplus enable AAC+ encoding via libaacplus [no]
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--enable-libass enable libass subtitles rendering [no]
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--enable-libcelt enable CELT decoding via libcelt [no]
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--enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]
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--enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
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@ -1008,6 +1009,7 @@ CONFIG_LIST="
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hardcoded_tables
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huffman
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libaacplus
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libass
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libcdio
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libcelt
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libdc1394
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@ -1613,6 +1615,7 @@ udp_protocol_deps="network"
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# filters
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amovie_filter_deps="avcodec avformat"
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ass_filter_deps="libass"
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blackframe_filter_deps="gpl"
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boxblur_filter_deps="gpl"
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cropdetect_filter_deps="gpl"
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@ -3057,6 +3060,7 @@ enabled avisynth && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
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enabled frei0r && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
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enabled gnutls && require_pkg_config gnutls gnutls/gnutls.h gnutls_global_init
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enabled libaacplus && require "libaacplus >= 2.0.0" aacplus.h aacplusEncOpen -laacplus
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enabled libass && require_pkg_config libass ass/ass.h ass_library_init
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enabled libcelt && require libcelt celt/celt.h celt_decode -lcelt0
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enabled libdc1394 && require_pkg_config libdc1394-2 dc1394/dc1394.h dc1394_new
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enabled libdirac && require_pkg_config dirac \
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@ -3395,6 +3399,7 @@ echo "AVISynth enabled ${avisynth-no}"
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echo "frei0r enabled ${frei0r-no}"
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echo "gnutls enabled ${gnutls-no}"
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echo "libaacplus enabled ${libaacplus-no}"
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echo "libass enabled ${libass-no}"
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echo "libcdio support ${libcdio-no}"
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echo "libcelt enabled ${libcelt-no}"
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echo "libdc1394 support ${libdc1394-no}"
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@ -574,6 +574,22 @@ build.
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Below is a description of the currently available video filters.
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@section ass
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Draw ASS (Advanced Substation Alpha) subtitles on top of input video
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using the libass library.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libass}.
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This filter accepts in input the name of the ass file to render.
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For example, to render the file @file{sub.ass} on top of the input
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video, use the command:
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@example
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ass=sub.ass
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@end example
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@section blackframe
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Detect frames that are (almost) completely black. Can be useful to
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@ -40,6 +40,7 @@ OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
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OBJS-$(CONFIG_ABUFFERSINK_FILTER) += sink_buffer.o
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OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
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OBJS-$(CONFIG_ASS_FILTER) += vf_ass.o
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OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
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OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
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OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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@ -51,6 +51,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (ABUFFERSINK, abuffersink, asink);
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REGISTER_FILTER (ANULLSINK, anullsink, asink);
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REGISTER_FILTER (ASS, ass, vf);
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REGISTER_FILTER (BLACKFRAME, blackframe, vf);
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REGISTER_FILTER (BOXBLUR, boxblur, vf);
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REGISTER_FILTER (COPY, copy, vf);
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@ -29,8 +29,8 @@
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#include "libavutil/rational.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 49
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#define LIBAVFILTER_VERSION_MICRO 1
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#define LIBAVFILTER_VERSION_MINOR 50
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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@ -0,0 +1,242 @@
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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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