Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavformat/Makefile | 1 +
libavformat/allformats.c | 2 +-
libavformat/sccenc.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 124 insertions(+), 1 deletion(-)
create mode 100644 libavformat/sccenc.c
diff --git a/libavformat/Makefile b/libavformat/Makefile
index e291925..478c06b 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -435,6 +435,7 @@ OBJS-$(CONFIG_SAP_DEMUXER) += sapdec.o
OBJS-$(CONFIG_SAP_MUXER) += sapenc.o
OBJS-$(CONFIG_SBG_DEMUXER) += sbgdec.o
OBJS-$(CONFIG_SCC_DEMUXER) += sccdec.o subtitles.o
+OBJS-$(CONFIG_SCC_MUXER) += sccenc.o subtitles.o
OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o
OBJS-$(CONFIG_SDR2_DEMUXER) += sdr2.o
OBJS-$(CONFIG_SDS_DEMUXER) += sdsdec.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 9c1f6dd..35869e3 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -273,7 +273,7 @@ void av_register_all(void)
REGISTER_DEMUXER (SAMI, sami);
REGISTER_MUXDEMUX(SAP, sap);
REGISTER_DEMUXER (SBG, sbg);
- REGISTER_DEMUXER (SCC, scc);
+ REGISTER_MUXDEMUX(SCC, scc);
REGISTER_DEMUXER (SDP, sdp);
REGISTER_DEMUXER (SDR2, sdr2);
REGISTER_DEMUXER (SDS, sds);
diff --git a/libavformat/sccenc.c b/libavformat/sccenc.c
new file mode 100644
index 0000000..5205f31
--- /dev/null
+++ b/libavformat/sccenc.c
@@ -0,0 +1,122 @@
+/*
+ * SCC muxer
+ * Copyright (c) 2017 Paul B Mahol
+ *
+ * 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/log.h"
+#include "libavutil/intreadwrite.h"
+
+typedef struct SCCContext {
+ int prev_h, prev_m, prev_s, prev_f;
+ int inside;
+ int n;
+} SCCContext;
+
+static int scc_write_header(AVFormatContext *avf)
+{
+ SCCContext *scc = avf->priv_data;
+
+ if (avf->nb_streams != 1 ||
+ avf->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE) {
+ av_log(avf, AV_LOG_ERROR,
+ "SCC supports only a single subtitles stream.\n");
+ return AVERROR(EINVAL);
+ }
+ if (avf->streams[0]->codecpar->codec_id != AV_CODEC_ID_EIA_608) {
+ av_log(avf, AV_LOG_ERROR,
+ "Unsupported subtitles codec: %s\n",
+ avcodec_get_name(avf->streams[0]->codecpar->codec_id));
+ return AVERROR(EINVAL);
+ }
+ avpriv_set_pts_info(avf->streams[0], 64, 1, 1000);
+ avio_printf(avf->pb, "Scenarist_SCC V1.0\n");
+
+ scc->prev_h = scc->prev_m = scc->prev_s = scc->prev_f = -1;
+ scc->inside = 0;
+
+ return 0;
+}
+
+static int scc_write_packet(AVFormatContext *avf, AVPacket *pkt)
+{
+ SCCContext *scc = avf->priv_data;
+ int64_t pts = pkt->pts;
+ int i, h, m, s, f;
+
+ if (pts == AV_NOPTS_VALUE) {
+ av_log(avf, AV_LOG_WARNING,
+ "Insufficient timestamps.\n");
+ return 0;
+ }
+
+ h = (int)(pts / (3600000));
+ m = (int)(pts / (60000)) % 60;
+ s = (int)(pts / 1000) % 60;
+ f = (int)(pts % 1000) / 33;
+
+ for (i = 0; i < pkt->size; i+=3) {
+ if (pkt->data[i] == 0xfc && ((pkt->data[i + 1] != 0x80 || pkt->data[i
+ 2] != 0x80)))
+ break;
+ }
+ if (i >= pkt->size)
+ return 0;
+
+ if (!scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s
!= s || scc->prev_f != f)) {
+ avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
+ scc->inside = 1;
+ }
+ for (i = 0; i < pkt->size; i+=3) {
+ if (i + 3 > pkt->size)
+ break;
+
+ if (pkt->data[i] != 0xfc || (pkt->data[i + 1] == 0x80 && pkt->data[i +
2] == 0x80))
+ continue;
+ if (!scc->inside) {
+ avio_printf(avf->pb, "\n%02d:%02d:%02d:%02d\t", h, m, s, f);
+ scc->inside = 1;
+ }
+ if (scc->n > 0)
+ avio_printf(avf->pb, " ");
+ avio_printf(avf->pb, "%02x%02x", pkt->data[i + 1], pkt->data[i + 2]);
+ scc->n++;
+ }
+ if (scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s !=
s || scc->prev_f != f)) {
+ avio_printf(avf->pb, "\n");
+ scc->n = 0;
+ scc->inside = 0;
+ }
+
+ scc->prev_h = h;
+ scc->prev_m = m;
+ scc->prev_s = s;
+ scc->prev_f = f;
+ return 0;
+}
+
+AVOutputFormat ff_scc_muxer = {
+ .name = "scc",
+ .long_name = NULL_IF_CONFIG_SMALL("Scenarist Closed Captions"),
+ .extensions = "scc",
+ .priv_data_size = sizeof(SCCContext),
+ .write_header = scc_write_header,
+ .write_packet = scc_write_packet,
+ .subtitle_codec = AV_CODEC_ID_EIA_608,
+};
--
2.9.3
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