Signed-off-by: softworkz <softwo...@hotmail.com>
---
v2 Update:
- Implemented Andreas' suggestions
- overlay_subs filter:
- removed duplicated code
- implemented direct (no pre-conversion) blending of graphical
subtitle rects
- Supported input formats:
- all packed RGB formats (with and without alpha)
- yuv420p, yuv422p, yuv444p
libavfilter/Makefile | 3 +
libavfilter/allfilters.c | 1 +
libavfilter/sf_sleet.c | 209 +++++++++++++++++++++++++++++++++++++++
3 files changed, 213 insertions(+)
create mode 100644 libavfilter/sf_sleet.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index e38c6b6f6d..25dd1276de 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -526,6 +526,9 @@ OBJS-$(CONFIG_YUVTESTSRC_FILTER) +=
vsrc_testsrc.o
OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o
+# subtitle filters
+OBJS-$(CONFIG_SLEET_FILTER) += sf_sleet.o
+
# multimedia filters
OBJS-$(CONFIG_ABITSCOPE_FILTER) += avf_abitscope.o
OBJS-$(CONFIG_ADRAWGRAPH_FILTER) += f_drawgraph.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 5bd54db2c8..efe16b8e1b 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -519,6 +519,7 @@ extern const AVFilter ff_avf_showwaves;
extern const AVFilter ff_avf_showwavespic;
extern const AVFilter ff_vaf_spectrumsynth;
extern const AVFilter ff_svf_sub2video;
+extern const AVFilter ff_sf_sleet;
/* multimedia sources */
extern const AVFilter ff_avsrc_amovie;
diff --git a/libavfilter/sf_sleet.c b/libavfilter/sf_sleet.c
new file mode 100644
index 0000000000..cf7701c01f
--- /dev/null
+++ b/libavfilter/sf_sleet.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (c) 2021 softworkz
+ *
+ * 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
+ * text subtitle filter which translates to 'leet speak'
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "libavcodec/avcodec.h"
+
+static const char* alphabet_src =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+static const char* alphabet_dst =
"abcd3f6#1jklmn0pq257uvwxyzAB(D3F6#1JKLMN0PQ257UVWXYZ";
+
+
+typedef struct LeetContext {
+ const AVClass *class;
+ enum AVSubtitleType format;
+} LeetContext;
+
+static const AVOption sleet_options[] = {
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(sleet);
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats = NULL;
+ AVFilterLink *inlink = ctx->inputs[0];
+ AVFilterLink *outlink = ctx->outputs[0];
+ static const enum AVSubtitleType subtitle_fmts[] = { SUBTITLE_ASS,
SUBTITLE_NONE };
+ static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_RGB32,
AV_PIX_FMT_NONE };
+ int ret;
+
+ /* set input subtitle format */
+ formats = ff_make_format_list(subtitle_fmts);
+ if ((ret = ff_formats_ref(formats, &inlink->outcfg.formats)) < 0)
+ return ret;
+
+ /* set output video format */
+ formats = ff_make_format_list(pix_fmts);
+ if ((ret = ff_formats_ref(formats, &outlink->incfg.formats)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ LeetContext *s = ctx->priv;
+
+ s->format = inlink->format;
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ LeetContext *s = outlink->src->priv;
+
+ outlink->format = s->format;
+
+ return 0;
+}
+
+static void avsubtitle_free_ref(void *opaque, uint8_t *data)
+{
+ avsubtitle_free((AVSubtitle *)data);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *src_frame)
+{
+ LeetContext *s = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVSubtitle *sub;
+ int ret;
+ AVFrame *out;
+ unsigned int num_rects;
+ uint8_t *dst;
+
+ outlink->format = inlink->format;
+
+ out = av_frame_alloc();
+ if (!out) {
+ av_frame_free(&src_frame);
+ return AVERROR(ENOMEM);
+ }
+
+ out->format = outlink->format;
+
+ if ((ret = av_frame_get_buffer2(out, AVMEDIA_TYPE_SUBTITLE, 0)) < 0)
+ return ret;
+
+ out->pts = src_frame->pts;
+ out->repeat_pict = src_frame->repeat_pict;
+ out->pkt_dts = src_frame->pkt_dts;
+ out->pkt_pos = src_frame->pkt_pos;
+ out->pkt_size = src_frame->pkt_size;
+ out->pkt_duration = src_frame->pkt_duration;
+ out->reordered_opaque = src_frame->reordered_opaque;
+ out->best_effort_timestamp = src_frame->best_effort_timestamp;
+ out->flags = src_frame->flags;
+
+ sub = (AVSubtitle *)src_frame->data[0];
+
+ if (sub) {
+ AVSubtitle *out_sub = av_memdup(sub, sizeof(*out_sub));
+ if (!out_sub)
+ return AVERROR(ENOMEM);
+
+ out->buf[0] = av_buffer_create((uint8_t*)out_sub, sizeof(*out_sub),
avsubtitle_free_ref, NULL, AV_BUFFER_FLAG_READONLY);
+ out->data[0] = (uint8_t*)out_sub;
+
+ if (sub->num_rects) {
+ out_sub->rects = av_malloc_array(sub->num_rects,
sizeof(AVSubtitleRect *));
+ }
+
+ for (unsigned i = 0; i < sub->num_rects; i++) {
+
+ AVSubtitleRect *src_rect = sub->rects[i];
+ AVSubtitleRect *dst_rect = av_memdup(src_rect, sizeof(*dst_rect));
+ out_sub->rects[i] = dst_rect;
+
+ if (src_rect->text) {
+ dst_rect->text = av_strdup(src_rect->text);
+ if (!dst_rect->text)
+ return AVERROR(ENOMEM);
+
+ for (size_t n = 0; n < strlen(dst_rect->text); n++) {
+ for (size_t t = 0; t < FF_ARRAY_ELEMS(alphabet_src); t++) {
+ if (dst_rect->text[n] == alphabet_src[t]) {
+ dst_rect->text[n] = alphabet_dst[t];
+ break;
+ }
+ }
+ }
+ }
+
+ if (src_rect->ass) {
+ dst_rect->ass = av_strdup(src_rect->ass);
+ if (!dst_rect->ass)
+ return AVERROR(ENOMEM);
+
+ for (size_t n = 0; n < strlen(dst_rect->ass); n++) {
+ for (size_t t = 0; t < FF_ARRAY_ELEMS(alphabet_src); t++) {
+ if (dst_rect->ass[n] == alphabet_src[t]) {
+ dst_rect->ass[n] = alphabet_dst[t];
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ av_frame_free(&src_frame);
+ return ff_filter_frame(outlink, out);
+}
+
+static const AVFilterPad sleet_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ { NULL }
+};
+
+static const AVFilterPad sleet_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+const AVFilter ff_sf_sleet = {
+ .name = "sleet",
+ .description = NULL_IF_CONFIG_SMALL("Translate text subtitles to 'leet
speak'"),
+ .query_formats = query_formats,
+ .priv_size = sizeof(LeetContext),
+ .priv_class = &sleet_class,
+ .inputs = sleet_inputs,
+ .outputs = sleet_outputs,
+};
--
2.30.2.windows.1
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