[FFmpeg-devel] [PATCH 6/8] add SRT muxer and demuxer
Aurelien Jacobs
aurel
Wed Jul 21 11:53:17 CEST 2010
---
Changelog | 1
doc/general.texi | 1
libavcodec/avcodec.h | 1
libavformat/Makefile | 2 +
libavformat/allformats.c | 1
libavformat/avformat.h | 2 -
libavformat/raw.c | 12 +++++
libavformat/srtdec.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 121 insertions(+), 1 deletions(-)
create mode 100644 libavformat/srtdec.c
diff --git a/Changelog b/Changelog
index 4facc09..f1d7f79 100644
--- a/Changelog
+++ b/Changelog
@@ -23,6 +23,7 @@ version <next>:
- RTP depacketization of QDM2
- ANSI/ASCII art playback system
- Lego Mindstorms RSO de/muxer
+- SubRip subtitle file muxer and demuxer
diff --git a/doc/general.texi b/doc/general.texi
index 76c676f..a8a5444 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -684,6 +684,7 @@ performance on systems without hardware floating point support).
@item DVB @tab X @tab X @tab X @tab X
@item DVD @tab X @tab X @tab X @tab X
@item PGS @tab @tab @tab @tab X
+ at item SubRip (SRT) @tab X @tab X
@item XSUB @tab @tab @tab X @tab X
@end multitable
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 560d575..14e049d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -348,6 +348,7 @@ enum CodecID {
CODEC_ID_MOV_TEXT,
CODEC_ID_HDMV_PGS_SUBTITLE,
CODEC_ID_DVB_TELETEXT,
+ CODEC_ID_SRT,
/* other specific kind of codecs (generally used for attachments) */
CODEC_ID_TTF= 0x18000,
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 50a7b3a..c32a254 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -242,6 +242,8 @@ OBJS-$(CONFIG_SOL_DEMUXER) += sol.o raw.o
OBJS-$(CONFIG_SOX_DEMUXER) += soxdec.o raw.o
OBJS-$(CONFIG_SOX_MUXER) += soxenc.o
OBJS-$(CONFIG_SPDIF_MUXER) += spdif.o
+OBJS-$(CONFIG_SRT_DEMUXER) += srtdec.o
+OBJS-$(CONFIG_SRT_MUXER) += raw.o
OBJS-$(CONFIG_STR_DEMUXER) += psxstr.o
OBJS-$(CONFIG_SWF_DEMUXER) += swfdec.o
OBJS-$(CONFIG_SWF_MUXER) += swfenc.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index ce0e90d..0b39e84 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -189,6 +189,7 @@ void av_register_all(void)
REGISTER_DEMUXER (SOL, sol);
REGISTER_MUXDEMUX (SOX, sox);
REGISTER_MUXER (SPDIF, spdif);
+ REGISTER_MUXDEMUX (SRT, srt);
REGISTER_DEMUXER (STR, str);
REGISTER_MUXDEMUX (SWF, swf);
REGISTER_MUXER (TG2, tg2);
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 076b8c8..8ba2d81 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -22,7 +22,7 @@
#define AVFORMAT_AVFORMAT_H
#define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 76
+#define LIBAVFORMAT_VERSION_MINOR 77
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
diff --git a/libavformat/raw.c b/libavformat/raw.c
index 0c83c42..dc48c91 100644
--- a/libavformat/raw.c
+++ b/libavformat/raw.c
@@ -1082,6 +1082,18 @@ AVOutputFormat mlp_muxer = {
};
#endif
+#if CONFIG_SRT_MUXER
+AVOutputFormat srt_muxer = {
+ .name = "srt",
+ .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"),
+ .mime_type = "application/x-subrip",
+ .extensions = "srt",
+ .write_packet = raw_write_packet,
+ .flags = AVFMT_NOTIMESTAMPS,
+ .subtitle_codec = CODEC_ID_SRT,
+};
+#endif
+
#if CONFIG_TRUEHD_DEMUXER
AVInputFormat truehd_demuxer = {
"truehd",
diff --git a/libavformat/srtdec.c b/libavformat/srtdec.c
new file mode 100644
index 0000000..5ccd6bb
--- /dev/null
+++ b/libavformat/srtdec.c
@@ -0,0 +1,102 @@
+/*
+ * SubRip subtitle demuxer
+ * Copyright (c) 2010 Aurelien Jacobs <aurel at gnuage.org>
+ *
+ * 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
+ */
+
+#include "avformat.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+
+static int srt_probe(AVProbeData *p)
+{
+ unsigned char *ptr = p->buf;
+ int i, v, num = 0;
+
+ if (AV_RB24(ptr) == 0xEFBBBF)
+ ptr += 3; /* skip UTF-8 BOM */
+
+ for (i=0; i<2; i++) {
+ if (num == i && sscanf(ptr, "%*d:%*2d:%*2d%*1[,.]%*3d --> %*d:%*2d:%*2d%*1[,.]%3d", &v) == 1)
+ return AVPROBE_SCORE_MAX;
+ num = atoi(ptr);
+ ptr += strcspn(ptr, "\n") + 1;
+ }
+ return 0;
+}
+
+static int srt_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ AVStream *st = av_new_stream(s, 0);
+ if (!st)
+ return -1;
+ av_set_pts_info(st, 64, 1, 1000);
+ st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+ st->codec->codec_id = CODEC_ID_SRT;
+ return 0;
+}
+
+static int64_t get_pts(const char *buf)
+{
+ int i, v, hour, min, sec, hsec;
+
+ for (i=0; i<2; i++) {
+ if (sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %*d:%*2d:%*2d%*1[,.]%3d",
+ &hour, &min, &sec, &hsec, &v) == 5) {
+ min += 60*hour;
+ sec += 60*min;
+ return sec*1000+hsec;
+ }
+ buf += strcspn(buf, "\n") + 1;
+ }
+ return AV_NOPTS_VALUE;
+}
+
+static inline int is_eol(char c)
+{
+ return c == '\r' || c == '\n';
+}
+
+static int srt_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ char buffer[2048], *ptr = buffer, *ptr2 = ptr;
+ int64_t pos = url_ftell(s->pb);
+ int res = AVERROR_EOF;
+
+ while (!is_eol(*ptr2) && !url_feof(s->pb) && ptr-buffer<sizeof(buffer)-1) {
+ ptr2 = ptr;
+ ptr += ff_get_line(s->pb, ptr, sizeof(buffer)+buffer-ptr);
+ }
+
+ if (buffer[0] && !(res = av_new_packet(pkt, ptr-buffer))) {
+ memcpy(pkt->data, buffer, pkt->size);
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ pkt->pos = pos;
+ pkt->pts = pkt->dts = get_pts(pkt->data);
+ }
+ return res;
+}
+
+AVInputFormat srt_demuxer = {
+ .name = "srt",
+ .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle format"),
+ .read_probe = srt_probe,
+ .read_header = srt_read_header,
+ .read_packet = srt_read_packet,
+ .flags = AVFMT_GENERIC_INDEX,
+};
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