From: Clément Bœsch <ubi...@gmail.com>
Signed-off-by: Josh Allmann <joshua.allm...@gmail.com>
---
Changelog | 1 +
configure | 5 +
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 2 +
libavfilter/vf_subtitles.c | 366 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 375 insertions(+)
create mode 100644 libavfilter/vf_subtitles.c
diff --git a/Changelog b/Changelog
index 7a2a7c8..6b78363 100644
--- a/Changelog
+++ b/Changelog
@@ -25,6 +25,7 @@ version 10:
- support for WavPack muxing (raw and in Matroska)
- Go2Webinar decoder
- WavPack encoding through libwavpack
+- subtitles filter
version 9:
diff --git a/configure b/configure
index 0bd54dd..0d3cf43 100755
--- a/configure
+++ b/configure
@@ -177,6 +177,7 @@ External library support:
--enable-bzlib enable bzlib [autodetect]
--enable-frei0r enable frei0r video filtering
--enable-gnutls enable gnutls [no]
+ --enable-libass enable libass subtitles rendering [no]
--enable-libcdio enable audio CD grabbing with libcdio
--enable-libdc1394 enable IIDC-1394 grabbing using libdc1394
and libraw1394 [no]
@@ -1039,6 +1040,7 @@ EXTERNAL_LIBRARY_LIST="
bzlib
frei0r
gnutls
+ libass
libcdio
libdc1394
libfaac
@@ -1897,9 +1899,11 @@ frei0r_src_filter_deps="frei0r dlopen strtok_r"
frei0r_src_filter_extralibs='$ldl'
hqdn3d_filter_deps="gpl"
interlace_filter_deps="gpl"
+libass_filter_deps="libass"
resample_filter_deps="avresample"
ocv_filter_deps="libopencv"
scale_filter_deps="swscale"
+subtitles_filter_deps="avformat avcodec libass"
yadif_filter_deps="gpl"
# libraries
@@ -3718,6 +3722,7 @@ done
enabled avisynth && require2 vfw32 "windows.h vfw.h" AVIFileInit
-lavifil32
enabled frei0r && { check_header frei0r.h || die "ERROR: frei0r.h
header not found"; }
enabled gnutls && require_pkg_config gnutls gnutls/gnutls.h
gnutls_global_init
+enabled libass && require_pkg_config libass ass/ass.h
ass_library_init
enabled libfaac && require2 libfaac "stdint.h faac.h"
faacEncGetVersion -lfaac
enabled libfdk_aac && require libfdk_aac fdk-aac/aacenc_lib.h
aacEncOpen -lfdk-aac
enabled libfreetype && require_pkg_config freetype2 "ft2build.h
freetype/freetype.h" FT_Init_FreeType
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 96fa8c0..5aaf90d 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -77,6 +77,7 @@ OBJS-$(CONFIG_SETSAR_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SETTB_FILTER) += vf_settb.o
OBJS-$(CONFIG_SHOWINFO_FILTER) += vf_showinfo.o
OBJS-$(CONFIG_SPLIT_FILTER) += split.o
+OBJS-$(CONFIG_SUBTITLES_FILTER) += vf_subtitles.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_TRIM_FILTER) += trim.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 20407ce..9cd6c0f 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -79,6 +79,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(HFLIP, hflip, vf);
REGISTER_FILTER(HQDN3D, hqdn3d, vf);
REGISTER_FILTER(INTERLACE, interlace, vf);
+ REGISTER_FILTER(LIBASS, libass, vf);
REGISTER_FILTER(LUT, lut, vf);
REGISTER_FILTER(LUTRGB, lutrgb, vf);
REGISTER_FILTER(LUTYUV, lutyuv, vf);
@@ -97,6 +98,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(SETTB, settb, vf);
REGISTER_FILTER(SHOWINFO, showinfo, vf);
REGISTER_FILTER(SPLIT, split, vf);
+ REGISTER_FILTER(SUBTITLES, subtitles, vf);
REGISTER_FILTER(TRANSPOSE, transpose, vf);
REGISTER_FILTER(TRIM, trim, vf);
REGISTER_FILTER(UNSHARP, unsharp, vf);
diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c
new file mode 100644
index 0000000..c7be4e5
--- /dev/null
+++ b/libavfilter/vf_subtitles.c
@@ -0,0 +1,366 @@
+/*
+ * Copyright (c) 2011 Baptiste Coudurier
+ * Copyright (c) 2011 Stefano Sabatini
+ * Copyright (c) 2012 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Libass subtitles burning filter.
+ *
+ * @see{http://www.matroska.org/technical/specs/subtitles/ssa.html}
+ */
+
+#include <ass/ass.h>
+
+#include "config.h"
+#if CONFIG_SUBTITLES_FILTER
+# include "libavcodec/avcodec.h"
+# include "libavformat/avformat.h"
+#endif
+#include "libavutil/avstring.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "drawutils.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "formats.h"
+#include "video.h"
+
+typedef struct {
+ const AVClass *class;
+ ASS_Library *library;
+ ASS_Renderer *renderer;
+ ASS_Track *track;
+ char *filename;
+ char *charenc;
+ uint8_t rgba_map[4];
+ int pix_step[4]; ///< steps per pixel for each plane of the main
output
+ int original_w, original_h;
+ FFDrawContext draw;
+} AssContext;
+
+#define OFFSET(x) offsetof(AssContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+#define COMMON_OPTIONS \
+ {"filename", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN,
CHAR_MAX, FLAGS }, \
+ {"f", "set the filename of file to read",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN,
CHAR_MAX, FLAGS }, \
+ {"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 }, \
+
+/* libass supports a log level ranging from 0 to 7 */
+static const int ass_libavfilter_log_level_map[] = {
+ AV_LOG_QUIET, /* 0 */
+ AV_LOG_PANIC, /* 1 */
+ AV_LOG_FATAL, /* 2 */
+ AV_LOG_ERROR, /* 3 */
+ AV_LOG_WARNING, /* 4 */
+ AV_LOG_INFO, /* 5 */
+ AV_LOG_VERBOSE, /* 6 */
+ AV_LOG_DEBUG, /* 7 */
+};
+
+static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
+{
+ int level = ass_libavfilter_log_level_map[ass_level];
+
+ av_vlog(ctx, level, fmt, args);
+ av_log(ctx, level, "\n");
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+
+ if (!ass->filename) {
+ av_log(ctx, AV_LOG_ERROR, "No filename provided!\n");
+ return AVERROR(EINVAL);
+ }
+
+ ass->library = ass_library_init();
+ if (!ass->library) {
+ av_log(ctx, AV_LOG_ERROR, "Could not initialize libass.\n");
+ return AVERROR(EINVAL);
+ }
+ ass_set_message_cb(ass->library, ass_log, ctx);
+
+ ass->renderer = ass_renderer_init(ass->library);
+ if (!ass->renderer) {
+ av_log(ctx, AV_LOG_ERROR, "Could not initialize libass renderer.\n");
+ return AVERROR(EINVAL);
+ }
+
+ ass_set_fonts(ass->renderer, NULL, NULL, 1, NULL, 1);
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+
+ if (ass->track)
+ ass_free_track(ass->track);
+ if (ass->renderer)
+ ass_renderer_done(ass->renderer);
+ if (ass->library)
+ ass_library_done(ass->library);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AssContext *ass = inlink->dst->priv;
+
+ ff_draw_init(&ass->draw, inlink->format, 0);
+
+ ass_set_frame_size (ass->renderer, inlink->w, inlink->h);
+ if (ass->original_w && ass->original_h)
+ ass_set_aspect_ratio(ass->renderer, (double)inlink->w / inlink->h,
+ (double)ass->original_w / ass->original_h);
+
+ return 0;
+}
+
+/* libass stores an RGBA color in the format RRGGBBTT, where TT is the
transparency level */
+#define AR(c) ( (c)>>24)
+#define AG(c) (((c)>>16)&0xFF)
+#define AB(c) (((c)>>8) &0xFF)
+#define AA(c) ((0xFF-c) &0xFF)
+
+static void overlay_ass_image(AssContext *ass, AVFrame *picref,
+ const ASS_Image *image)
+{
+ for (; image; image = image->next) {
+ uint8_t rgba_color[] = {AR(image->color), AG(image->color),
AB(image->color), AA(image->color)};
+ FFDrawColor color;
+ ff_draw_color(&ass->draw, &color, rgba_color);
+ ff_blend_mask(&ass->draw, &color,
+ picref->data, picref->linesize,
+ picref->width, picref->height,
+ image->bitmap, image->stride, image->w, image->h,
+ 3, 0, image->dst_x, image->dst_y);
+ }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AssContext *ass = ctx->priv;
+ int detect_change = 0;
+ double time_ms = picref->pts * av_q2d(inlink->time_base) * 1000;
+ ASS_Image *image = ass_render_frame(ass->renderer, ass->track,
+ time_ms, &detect_change);
+
+ if (detect_change)
+ av_log(ctx, AV_LOG_DEBUG, "Change happened at time ms:%f\n", time_ms);
+
+ overlay_ass_image(ass, picref, image);
+
+ return ff_filter_frame(outlink, picref);
+}
+
+static const AVFilterPad ass_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ .needs_writable = 1,
+ },
+ { NULL }
+};
+
+static const AVFilterPad ass_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+#if CONFIG_LIBASS_FILTER
+
+static const AVOption ass_options[] = {
+ COMMON_OPTIONS
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(ass);
+
+static av_cold int init_ass(AVFilterContext *ctx)
+{
+ AssContext *ass = ctx->priv;
+ int ret = init(ctx);
+
+ if (ret < 0)
+ return ret;
+
+ ass->track = ass_read_file(ass->library, ass->filename, NULL);
+ if (!ass->track) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Could not create a libass track when reading file '%s'\n",
+ ass->filename);
+ return AVERROR(EINVAL);
+ }
+ return 0;
+}
+
+AVFilter avfilter_vf_libass = {
+ .name = "libass",
+ .description = NULL_IF_CONFIG_SMALL("Render ASS subtitles onto input
video using the libass library."),
+ .priv_size = sizeof(AssContext),
+ .init = init_ass,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = ass_inputs,
+ .outputs = ass_outputs,
+ .priv_class = &ass_class,
+};
+#endif
+
+#if CONFIG_SUBTITLES_FILTER
+
+static const AVOption subtitles_options[] = {
+ COMMON_OPTIONS
+ {"charenc", "set input character encoding", OFFSET(charenc),
AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
+ {NULL},
+};
+
+AVFILTER_DEFINE_CLASS(subtitles);
+
+static av_cold int init_subtitles(AVFilterContext *ctx)
+{
+ int ret, sid;
+ AVDictionary *codec_opts = NULL;
+ AVFormatContext *fmt = NULL;
+ AVCodecContext *dec_ctx = NULL;
+ AVCodec *dec = NULL;
+ const AVCodecDescriptor *dec_desc;
+ AVStream *st;
+ AVPacket pkt;
+ AssContext *ass = ctx->priv;
+
+ /* Init libass */
+ ret = init(ctx);
+ if (ret < 0)
+ return ret;
+ ass->track = ass_new_track(ass->library);
+ if (!ass->track) {
+ av_log(ctx, AV_LOG_ERROR, "Could not create a libass track\n");
+ return AVERROR(EINVAL);
+ }
+
+ /* Open subtitles file */
+ ret = avformat_open_input(&fmt, ass->filename, NULL, NULL);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to open %s\n", ass->filename);
+ goto end;
+ }
+ ret = avformat_find_stream_info(fmt, NULL);
+ if (ret < 0)
+ goto end;
+
+ /* Locate subtitles stream */
+ ret = av_find_best_stream(fmt, AVMEDIA_TYPE_SUBTITLE, -1, -1, NULL, 0);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Unable to locate subtitle stream in %s\n",
+ ass->filename);
+ goto end;
+ }
+ sid = ret;
+ st = fmt->streams[sid];
+
+ /* Open decoder */
+ dec_ctx = st->codec;
+ dec = avcodec_find_decoder(dec_ctx->codec_id);
+ if (!dec) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to find subtitle codec %s\n",
+ avcodec_get_name(dec_ctx->codec_id));
+ return AVERROR(EINVAL);
+ }
+ dec_desc = avcodec_descriptor_get(dec_ctx->codec_id);
+ if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Only text based subtitles are currently supported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ if (ass->charenc)
+ av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
+ ret = avcodec_open2(dec_ctx, dec, &codec_opts);
+ if (ret < 0)
+ goto end;
+
+ /* Decode subtitles and push them into the renderer (libass) */
+ if (dec_ctx->subtitle_header)
+ ass_process_codec_private(ass->track,
+ dec_ctx->subtitle_header,
+ dec_ctx->subtitle_header_size);
+ av_init_packet(&pkt);
+ pkt.data = NULL;
+ pkt.size = 0;
+ while (av_read_frame(fmt, &pkt) >= 0) {
+ int i, got_subtitle;
+ AVSubtitle sub = {0};
+
+ if (pkt.stream_index == sid) {
+ ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
+ av_err2str(ret));
+ } else if (got_subtitle) {
+ for (i = 0; i < sub.num_rects; i++) {
+ char *ass_line = sub.rects[i]->ass;
+ if (!ass_line)
+ break;
+ ass_process_data(ass->track, ass_line, strlen(ass_line));
+ }
+ }
+ }
+ av_free_packet(&pkt);
+ avsubtitle_free(&sub);
+ }
+
+end:
+ av_dict_free(&codec_opts);
+ if (dec_ctx)
+ avcodec_close(dec_ctx);
+ if (fmt)
+ avformat_close_input(&fmt);
+ return ret;
+}
+
+AVFilter avfilter_vf_subtitles = {
+ .name = "subtitles",
+ .description = NULL_IF_CONFIG_SMALL("Render text subtitles onto input
video using the libass library."),
+ .priv_size = sizeof(AssContext),
+ .init = init_subtitles,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = ass_inputs,
+ .outputs = ass_outputs,
+ .priv_class = &subtitles_class,
+};
+#endif
--
1.7.9.5
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