RealText demuxer and decoder.

4 files changed, 148 insertions, 1 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 96fb954cad..9eaf28acae 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -255,6 +255,7 @@ OBJS-$(CONFIG_QCP_DEMUXER)               += qcp.o
 OBJS-$(CONFIG_R3D_DEMUXER)               += r3d.o
 OBJS-$(CONFIG_RAWVIDEO_DEMUXER)          += rawvideodec.o rawdec.o
 OBJS-$(CONFIG_RAWVIDEO_MUXER)            += rawenc.o
+OBJS-$(CONFIG_REALTEXT_DEMUXER)          += realtextdec.o
 OBJS-$(CONFIG_RL2_DEMUXER)               += rl2.o
 OBJS-$(CONFIG_RM_DEMUXER)                += rmdec.o rm.o
 OBJS-$(CONFIG_RM_MUXER)                  += rmenc.o rm.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 4ae790f25a..231b0cbf95 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -199,6 +199,7 @@ void av_register_all(void)
     REGISTER_DEMUXER  (QCP, qcp);
     REGISTER_DEMUXER  (R3D, r3d);
     REGISTER_MUXDEMUX (RAWVIDEO, rawvideo);
+    REGISTER_DEMUXER  (REALTEXT, realtext);
     REGISTER_DEMUXER  (RL2, rl2);
     REGISTER_MUXDEMUX (RM, rm);
     REGISTER_MUXDEMUX (ROQ, roq);
diff --git a/libavformat/realtextdec.c b/libavformat/realtextdec.c
new file mode 100644
index 0000000000..88a7fdd0db
--- /dev/null
+++ b/libavformat/realtextdec.c
@@ -0,0 +1,145 @@
+/*
+ * 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 {
+    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 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 int realtext_read_header(AVFormatContext *s)
+{
+    RealTextContext *rt = s->priv_data;
+    AVStream *st = avformat_new_stream(s, NULL);
+    AVBPrint buf;
+    char c = 0;
+    int res = 0, duration = read_ts("60"); // default duration is 60 seconds
+
+    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, AV_BPRINT_SIZE_UNLIMITED);
+
+    while (!url_feof(s->pb)) {
+        AVPacket *sub;
+        const int64_t pos = avio_tell(s->pb) - (c != 0);
+        int n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
+
+        if (n == 0)
+            break;
+
+        if (!av_strncasecmp(buf.str, "<window", 7)) {
+            /* save header to extradata */
+            const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
+
+            if (p)
+                duration = read_ts(p);
+            st->codec->extradata = av_strdup(buf.str);
+            if (!st->codec->extradata) {
+                res = AVERROR(ENOMEM);
+                goto end;
+            }
+            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 */
+            int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
+            sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge);
+            if (!sub) {
+                res = AVERROR(ENOMEM);
+                goto end;
+            }
+            if (!merge) {
+                const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
+                const char *end   = ff_smil_get_attr_ptr(buf.str, "end");
+
+                sub->pos      = pos;
+                sub->pts      = begin ? read_ts(begin) : 0;
+                sub->duration = end ? (read_ts(end) - sub->pts) : duration;
+            }
+        }
+        av_bprint_clear(&buf);
+    }
+    ff_subtitles_queue_finalize(&rt->q);
+
+end:
+    av_bprint_finalize(&buf, NULL);
+    return res;
+}
+
+static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    RealTextContext *rt = s->priv_data;
+    return ff_subtitles_queue_read_packet(&rt->q, pkt);
+}
+
+static int realtext_read_close(AVFormatContext *s)
+{
+    RealTextContext *rt = s->priv_data;
+    ff_subtitles_queue_clean(&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/libavformat/version.h b/libavformat/version.h
index d5a939560d..6090d651be 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR 54
-#define LIBAVFORMAT_VERSION_MINOR 13
+#define LIBAVFORMAT_VERSION_MINOR 14
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \