Add support for H.261 RTP payload format (RFC 4587)

1 files changed, 57 insertions, 0 deletions

diff --git a/libavformat/rtpenc_h261.c b/libavformat/rtpenc_h261.c
new file mode 100644
index 0000000000..6f63703f0a
--- /dev/null
+++ b/libavformat/rtpenc_h261.c
@@ -0,0 +1,57 @@
+/*
+ * RTP packetization for H.261 video (RFC 4587)
+ * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
+ *
+ * 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 "rtpenc.h"
+
+void ff_rtp_send_h261(AVFormatContext *s1, const uint8_t *frame_buf, int frame_size)
+{
+    RTPMuxContext *rtp_ctx = s1->priv_data;
+    int processed_frame_size;
+    int last_packet_of_frame;
+    uint8_t *tmp_buf_ptr;
+
+    /* use the default 90 KHz time stamp */
+    rtp_ctx->timestamp = rtp_ctx->cur_timestamp;
+
+    /* continue as long as not all frame data is processed */
+    while (frame_size > 0) {
+        tmp_buf_ptr = rtp_ctx->buf;
+        *tmp_buf_ptr++ = 1; /* V=1 */
+        *tmp_buf_ptr++ = 0;
+        *tmp_buf_ptr++ = 0;
+        *tmp_buf_ptr++ = 0;
+
+        processed_frame_size = FFMIN(rtp_ctx->max_payload_size - 4, frame_size);
+
+        //XXX: parse the h.261 bitstream and improve frame splitting here
+
+        last_packet_of_frame = (processed_frame_size == frame_size);
+
+        memcpy(tmp_buf_ptr, frame_buf, processed_frame_size);
+        tmp_buf_ptr += processed_frame_size;
+
+        ff_rtp_send_data(s1, rtp_ctx->buf, tmp_buf_ptr - rtp_ctx->buf, last_packet_of_frame);
+
+        frame_buf += processed_frame_size;
+        frame_size -= processed_frame_size;
+    }
+}