making act segmenter

1 files changed, 55 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/rtpenc_vp8.c b/ffmpeg/libavformat/rtpenc_vp8.c
new file mode 100644
index 0000000..671d245
--- /dev/null
+++ b/ffmpeg/libavformat/rtpenc_vp8.c
@@ -0,0 +1,55 @@
+/*
+ * RTP VP8 Packetizer
+ * Copyright (c) 2010 Josh Allmann
+ *
+ * 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 "rtpenc.h"
+
+/* Based on a draft spec for VP8 RTP.
+ * ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
+void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
+{
+    RTPMuxContext *s = s1->priv_data;
+    int len, max_packet_size, header_size;
+
+    s->buf_ptr      = s->buf;
+    s->timestamp    = s->cur_timestamp;
+
+    // extended control bit set, reference frame, start of partition,
+    // partition id 0
+    *s->buf_ptr++ = 0x90;
+    *s->buf_ptr++ = 0x80; // Picture id present
+    *s->buf_ptr++ = s->frame_count++ & 0x7f;
+    // Calculate the number of remaining bytes
+    header_size     = s->buf_ptr - s->buf;
+    max_packet_size = s->max_payload_size - header_size;
+
+    while (size > 0) {
+        len = FFMIN(size, max_packet_size);
+
+        memcpy(s->buf_ptr, buf, len);
+        // marker bit is last packet in frame
+        ff_rtp_send_data(s1, s->buf, len + header_size, size == len);
+
+        size         -= len;
+        buf          += len;
+        // Clear the partition start bit, keep the rest of the header untouched
+        s->buf[0]    &= ~0x10;
+    }
+}