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authorNicolas Martin <elvadrias@gmail.com>2009-02-08 18:50:32 +0000
committerVitor Sessak <vitor1001@gmail.com>2009-02-08 18:50:32 +0000
commiteaf5d0112bcaecd81016373259bad40a38608e62 (patch)
tree7baa3424c75144f6a0f88f8f2104a7a338be8d28 /libavformat/ncdec.c
parent998b6f7ca27ab2f8525a36c8f6eb1e8b4b09969c (diff)
downloadffmpeg-eaf5d0112bcaecd81016373259bad40a38608e62.tar.gz
NC camera demuxer
Patch by Nicolas Martin - elvadrias at gmail Originally committed as revision 17062 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/ncdec.c')
-rw-r--r--libavformat/ncdec.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/libavformat/ncdec.c b/libavformat/ncdec.c
new file mode 100644
index 0000000000..e6cca1068b
--- /dev/null
+++ b/libavformat/ncdec.c
@@ -0,0 +1,100 @@
+/*
+ * NC camera feed demuxer
+ * Copyright (c) 2009 Nicolas Martin (martinic at iro dot umontreal dot ca)
+ * Edouard Auvinet
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "avformat.h"
+
+#define NC_VIDEO_FLAG 0x1A5
+
+static int nc_probe(AVProbeData *probe_packet)
+{
+ int size;
+
+ if (AV_RB32(probe_packet->buf) != NC_VIDEO_FLAG)
+ return 0;
+
+ size = AV_RL16(probe_packet->buf + 5);
+
+ if (size + 20 > probe_packet->buf_size)
+ return 3*AVPROBE_SCORE_MAX/2;
+
+ if (AV_RB32(probe_packet->buf+16+size) == NC_VIDEO_FLAG)
+ return AVPROBE_SCORE_MAX;
+
+ return 0;
+}
+
+static int nc_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ AVStream *st = av_new_stream(s, 0);
+
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_id = CODEC_ID_MPEG4;
+ st->need_parsing = AVSTREAM_PARSE_FULL;
+
+ av_set_pts_info(st, 64, 1, 100);
+
+ return 0;
+}
+
+static int nc_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ int size;
+
+ uint32_t state=-1;
+ while (state != NC_VIDEO_FLAG) {
+ if (url_feof(s->pb))
+ return AVERROR(EIO);
+ state = (state<<8) + get_byte(s->pb);
+ }
+
+ get_byte(s->pb);
+ size = get_le16(s->pb);
+ url_fskip(s->pb, 9);
+
+ if (size == 0) {
+ av_log(s, AV_LOG_DEBUG, "Next packet size is zero\n");
+ return AVERROR(EAGAIN);
+ }
+
+ int ret = av_get_packet(s->pb, pkt, size);
+ if (ret != size) {
+ if (ret > 0) av_free_packet(pkt);
+ return AVERROR(EIO);
+ }
+
+ pkt->stream_index = 0;
+ return size;
+}
+
+AVInputFormat nc_demuxer = {
+ "nc",
+ NULL_IF_CONFIG_SMALL("NC camera feed format"),
+ 0,
+ nc_probe,
+ nc_read_header,
+ nc_read_packet,
+ .extensions = "v",
+};