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authorClément Bœsch <ubitux@gmail.com>2012-06-17 11:42:47 +0200
committerClément Bœsch <ubitux@gmail.com>2012-06-29 20:21:28 +0200
commit53640f42be9f18368a8339116f8abf30616c60b2 (patch)
tree806c126d4494c863859c003774d48312c37dd8b5 /libavformat/samidec.c
parentd948893dbd963a268e2fc093b3d09b5037560974 (diff)
downloadffmpeg-53640f42be9f18368a8339116f8abf30616c60b2.tar.gz
SAMI demuxer and decoder.
Diffstat (limited to 'libavformat/samidec.c')
-rw-r--r--libavformat/samidec.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/libavformat/samidec.c b/libavformat/samidec.c
new file mode 100644
index 0000000000..5995d86fcf
--- /dev/null
+++ b/libavformat/samidec.c
@@ -0,0 +1,132 @@
+/*
+ * 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
+ * SAMI subtitle demuxer
+ * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
+ */
+
+#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;
+} SAMIContext;
+
+static int sami_probe(AVProbeData *p)
+{
+ const unsigned char *ptr = p->buf;
+
+ if (AV_RB24(ptr) == 0xEFBBBF)
+ ptr += 3; /* skip UTF-8 BOM */
+ return !strncmp(ptr, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0;
+}
+
+static int sami_read_header(AVFormatContext *s)
+{
+ SAMIContext *sami = s->priv_data;
+ AVStream *st = avformat_new_stream(s, NULL);
+ AVBPrint buf, hdr_buf;
+ char c = 0;
+ int res = 0, got_first_sync_point = 0;
+
+ if (!st)
+ return AVERROR(ENOMEM);
+ avpriv_set_pts_info(st, 64, 1, 1000);
+ st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+ st->codec->codec_id = CODEC_ID_SAMI;
+
+ av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+ av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+
+ while (!url_feof(s->pb)) {
+ AVPacket *sub;
+ const int64_t pos = avio_tell(s->pb) - (c != 0);
+ int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
+
+ if (n == 0)
+ break;
+
+ is_sync = !av_strncasecmp(buf.str, "<SYNC", 5);
+ if (is_sync)
+ got_first_sync_point = 1;
+
+ if (!got_first_sync_point) {
+ av_bprintf(&hdr_buf, "%s", buf.str);
+ } else {
+ sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync);
+ if (!sub) {
+ res = AVERROR(ENOMEM);
+ goto end;
+ }
+ if (is_sync) {
+ const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
+ sub->pos = pos;
+ sub->pts = p ? strtol(p, NULL, 10) : 0;
+ sub->duration = -1;
+ }
+ }
+ av_bprint_clear(&buf);
+ }
+
+ st->codec->extradata_size = hdr_buf.len + 1;
+ av_bprint_finalize(&hdr_buf, (char **)&st->codec->extradata);
+ if (!st->codec->extradata) {
+ st->codec->extradata_size = 0;
+ res = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ ff_subtitles_queue_finalize(&sami->q);
+
+end:
+ av_bprint_finalize(&buf, NULL);
+ return res;
+}
+
+static int sami_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ SAMIContext *sami = s->priv_data;
+ return ff_subtitles_queue_read_packet(&sami->q, pkt);
+}
+
+static int sami_read_close(AVFormatContext *s)
+{
+ SAMIContext *sami = s->priv_data;
+ ff_subtitles_queue_clean(&sami->q);
+ return 0;
+}
+
+AVInputFormat ff_sami_demuxer = {
+ .name = "sami",
+ .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"),
+ .priv_data_size = sizeof(SAMIContext),
+ .read_probe = sami_probe,
+ .read_header = sami_read_header,
+ .read_packet = sami_read_packet,
+ .read_close = sami_read_close,
+ .flags = AVFMT_GENERIC_INDEX,
+ .extensions = "smi,sami",
+};