[FFmpeg-devel] [PATCH] RealText demuxer and decoder.
Clément Bœsch
ubitux at gmail.com
Sat Jun 16 22:13:42 CEST 2012
FIXME: bump minor in lavc & lavf
---
To be applied on top of the previous patchset (github/ubitux/ffmpeg/subtitles
is up-to-date, and includes this patch). The SMIL parser (in the demuxer) is
more reliable than the one in SAMI (which I will update soon if I don't feel
lazy).
---
doc/general.texi | 1 +
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/realtextdec.c | 81 ++++++++++++++++++++
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/realtextdec.c | 172 +++++++++++++++++++++++++++++++++++++++++++
tests/fate/subtitles.mak | 3 +
tests/ref/fate/sub-realtext | 1 +
10 files changed, 263 insertions(+)
create mode 100644 libavcodec/realtextdec.c
create mode 100644 libavformat/realtextdec.c
create mode 100644 tests/ref/fate/sub-realtext
diff --git a/doc/general.texi b/doc/general.texi
index def03e3..72d09ae 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -842,6 +842,7 @@ performance on systems without hardware floating point support).
@item JACOsub @tab X @tab X @tab @tab X
@item MicroDVD @tab X @tab X @tab @tab X
@item PGS @tab @tab @tab @tab X
+ at item RealText @tab @tab X @tab @tab X
@item SAMI @tab @tab X @tab @tab X
@item SubRip (SRT) @tab X @tab X @tab X @tab X
@item XSUB @tab @tab @tab X @tab X
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 668b4cd..ca58320 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -384,6 +384,7 @@ OBJS-$(CONFIG_ROQ_ENCODER) += roqvideoenc.o roqvideo.o elbg.o
OBJS-$(CONFIG_ROQ_DPCM_DECODER) += dpcm.o
OBJS-$(CONFIG_ROQ_DPCM_ENCODER) += roqaudioenc.o
OBJS-$(CONFIG_RPZA_DECODER) += rpza.o
+OBJS-$(CONFIG_REALTEXT_DECODER) += realtextdec.o ass.o
OBJS-$(CONFIG_RV10_DECODER) += rv10.o
OBJS-$(CONFIG_RV10_ENCODER) += rv10enc.o
OBJS-$(CONFIG_RV20_DECODER) += rv10.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 1eda64f..cf9e32e 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -402,6 +402,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (JACOSUB, jacosub);
REGISTER_DECODER (MICRODVD, microdvd);
REGISTER_DECODER (PGSSUB, pgssub);
+ REGISTER_DECODER (REALTEXT, realtext);
REGISTER_DECODER (SAMI, sami);
REGISTER_ENCDEC (SRT, srt);
REGISTER_ENCDEC (XSUB, xsub);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 952d846..7e874ad 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -427,6 +427,7 @@ enum CodecID {
CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
+ CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
/* other specific kind of codecs (generally used for attachments) */
CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
diff --git a/libavcodec/realtextdec.c b/libavcodec/realtextdec.c
new file mode 100644
index 0000000..512bfc1
--- /dev/null
+++ b/libavcodec/realtextdec.c
@@ -0,0 +1,81 @@
+/*
+ * 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
+ * RealText subtitle decoder
+ * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
+ */
+
+#include "avcodec.h"
+#include "ass.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+
+static int rt_event_to_ass(AVBPrint *buf, const char *p)
+{
+ int prev_chr_is_space = 1;
+
+ while (*p) {
+ if (*p != '<') {
+ if (!isspace(*p))
+ av_bprint_chars(buf, *p, 1);
+ else if (!prev_chr_is_space)
+ av_bprint_chars(buf, ' ', 1);
+ prev_chr_is_space = isspace(*p);
+ } else {
+ const char *end = strchr(p, '>');
+ if (!end)
+ break;
+ if (!av_strncasecmp(p, "<br/>", 5) ||
+ !av_strncasecmp(p, "<br>", 4)) {
+ av_bprintf(buf, "\\N");
+ }
+ p = end;
+ }
+ p++;
+ }
+ av_bprintf(buf, "\r\n");
+ return 0;
+}
+
+static int realtext_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_sub_ptr, AVPacket *avpkt)
+{
+ AVSubtitle *sub = data;
+ const char *ptr = avpkt->data;
+ AVBPrint buf;
+
+ av_bprint_init(&buf, 0, 4096);
+ if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
+ ff_ass_add_rect(sub, buf.str, avpkt->pts, avpkt->duration, 0);
+ *got_sub_ptr = sub->num_rects > 0;
+ av_bprint_finalize(&buf, NULL);
+ return avpkt->size;
+}
+
+AVCodec ff_realtext_decoder = {
+ .name = "realtext",
+ .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"),
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = CODEC_ID_REALTEXT,
+ .decode = realtext_decode_frame,
+ .init = ff_ass_subtitle_header_default,
+};
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 0771271..5f330dc 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -261,6 +261,7 @@ OBJS-$(CONFIG_ROQ_MUXER) += idroqenc.o rawenc.o
OBJS-$(CONFIG_RSO_DEMUXER) += rsodec.o rso.o pcm.o
OBJS-$(CONFIG_RSO_MUXER) += rsoenc.o rso.o
OBJS-$(CONFIG_RPL_DEMUXER) += rpl.o
+OBJS-$(CONFIG_REALTEXT_DEMUXER) += realtextdec.o
OBJS-$(CONFIG_RTP_MUXER) += rtp.o \
rtpenc_aac.o \
rtpenc_latm.o \
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index b383218..1cff964 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -203,6 +203,7 @@ void av_register_all(void)
REGISTER_MUXDEMUX (ROQ, roq);
REGISTER_DEMUXER (RPL, rpl);
REGISTER_MUXDEMUX (RSO, rso);
+ REGISTER_DEMUXER (REALTEXT, realtext);
REGISTER_MUXDEMUX (RTP, rtp);
REGISTER_MUXDEMUX (RTSP, rtsp);
REGISTER_DEMUXER (SAMI, sami);
diff --git a/libavformat/realtextdec.c b/libavformat/realtextdec.c
new file mode 100644
index 0000000..79d6608
--- /dev/null
+++ b/libavformat/realtextdec.c
@@ -0,0 +1,172 @@
+/*
+ * 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
+ * RealText subtitle demuxer
+ * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bprint.h"
+#include "libavutil/intreadwrite.h"
+
+typedef struct {
+ int sid;
+ FFDemuxSubtitlesQueue q;
+} RealTextContext;
+
+static int realtext_probe(AVProbeData *p)
+{
+ const unsigned char *ptr = p->buf;
+
+ if (AV_RB24(ptr) == 0xEFBBBF)
+ ptr += 3; /* skip UTF-8 BOM */
+ return !av_strncasecmp(ptr, "<window", 7) ? AVPROBE_SCORE_MAX/2 : 0;
+}
+
+static int extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c)
+{
+ int i = 0;
+ char end_chr;
+
+ if (!*c) // cached char?
+ *c = avio_r8(pb);
+ if (!*c)
+ return 0;
+
+ end_chr = *c == '<' ? '>' : '<';
+ do {
+ av_bprint_chars(buf, *c, 1);
+ *c = avio_r8(pb);
+ i++;
+ } while (*c != end_chr && *c);
+ if (end_chr == '>') {
+ av_bprint_chars(buf, '>', 1);
+ *c = 0;
+ }
+ return i;
+}
+
+static int read_ts(const char *s)
+{
+ int hh, mm, ss, ms;
+
+ if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms;
+ if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100;
+ if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms;
+ if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100;
+ if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms;
+ return strtol(s, NULL, 10) * 100;
+}
+
+static char *get_attr_ptr(const char *s, const char *tag)
+{
+ char *p = av_stristr(s, tag);
+ if (p) {
+ p += strlen(tag);
+ if (*p == '=') p++;
+ if (*p == '"') p++;
+ }
+ return p;
+}
+
+static int realtext_read_header(AVFormatContext *s)
+{
+ char c = 0;
+ int duration = read_ts("60"); // default duration is 60 seconds
+ RealTextContext *rt = s->priv_data;
+ AVStream *st = avformat_new_stream(s, NULL);
+ AVBPrint buf;
+
+ if (!st)
+ return AVERROR(ENOMEM);
+ avpriv_set_pts_info(st, 64, 1, 100);
+ st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+ st->codec->codec_id = CODEC_ID_REALTEXT;
+
+ av_bprint_init(&buf, 0, 4096);
+
+ while (!url_feof(s->pb)) {
+ FFDemuxSubEntry *sub;
+ const int64_t pos = avio_tell(s->pb) - (c != 0);
+ int merge, n = extract_next_chunk(s->pb, &buf, &c);
+
+ if (n == 0)
+ break;
+
+ if (!av_strncasecmp(buf.str, "<window", 7)) {
+ /* save header to extradata */
+ char *p = get_attr_ptr(buf.str, "duration");
+
+ if (p)
+ duration = read_ts(p);
+ st->codec->extradata = av_strdup(buf.str);
+ st->codec->extradata_size = buf.len + 1;
+ } else {
+ /* if we just read a <time> tag, introduce a new event, otherwise merge
+ * with the previous one */
+ merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
+ sub = ff_subtitles_queue_insert_event(&rt->q, buf.str, buf.len, merge);
+ if (!sub)
+ return AVERROR(ENOMEM);
+ if (!merge) {
+ const char *begin = get_attr_ptr(buf.str, "begin");
+ const char *end = get_attr_ptr(buf.str, "end");
+
+ sub->pos = pos;
+ sub->start = begin ? read_ts(begin) : 0;
+ sub->duration = end ? (read_ts(end) - sub->start) : duration;
+ }
+ }
+ av_bprint_clear(&buf);
+ }
+ ff_subtitles_queue_finalize(&rt->q);
+ av_bprint_finalize(&buf, NULL);
+ return 0;
+}
+
+static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ RealTextContext *rt = s->priv_data;
+ return ff_subtitles_queue_read_packet(&rt->q, pkt, rt->sid++);
+}
+
+static int realtext_read_close(AVFormatContext *s)
+{
+ RealTextContext *rt = s->priv_data;
+ ff_subtitles_queue_free(&rt->q);
+ return 0;
+}
+
+AVInputFormat ff_realtext_demuxer = {
+ .name = "realtext",
+ .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"),
+ .priv_data_size = sizeof(RealTextContext),
+ .read_probe = realtext_probe,
+ .read_header = realtext_read_header,
+ .read_packet = realtext_read_packet,
+ .read_close = realtext_read_close,
+ .flags = AVFMT_GENERIC_INDEX,
+ .extensions = "rt",
+};
diff --git a/tests/fate/subtitles.mak b/tests/fate/subtitles.mak
index 78b9503..e56a056 100644
--- a/tests/fate/subtitles.mak
+++ b/tests/fate/subtitles.mak
@@ -10,6 +10,9 @@ fate-sub-sami: CMD = md5 -i $(SAMPLES)/sub/SAMI_capability_tester.smi -f ass
FATE_SUBTITLES += fate-sub-srt
fate-sub-srt: CMD = md5 -i $(SAMPLES)/sub/SubRip_capability_tester.srt -f ass
+FATE_SUBTITLES += fate-sub-realtext
+fate-sub-realtext: CMD = md5 -i $(SAMPLES)/sub/RealText_capability_tester.rt -f ass
+
FATE_SUBTITLES += $(FATE_SUBTITLES-yes)
FATE_SAMPLES_FFMPEG += $(FATE_SUBTITLES)
diff --git a/tests/ref/fate/sub-realtext b/tests/ref/fate/sub-realtext
new file mode 100644
index 0000000..42ac3bb
--- /dev/null
+++ b/tests/ref/fate/sub-realtext
@@ -0,0 +1 @@
+5366f62be001f6fd4a7f48893828bf51
--
1.7.10.4
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