* RTP packetization for H.264 (RFC3984)
* Copyright (c) 2008 Luca Abeni
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavformat/rtpenc_h264.c
+ * @file
* @brief H.264 packetization
* @author Luca Abeni <lucabe72@email.it>
*/
#include "avc.h"
#include "rtpenc.h"
+static const uint8_t *avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size)
+{
+ int res = 0;
+
+ if (end - start < nal_length_size)
+ return NULL;
+ while (nal_length_size--)
+ res = (res << 8) | *start++;
+
+ if (start + res > end || res < 0 || start + res < start)
+ return NULL;
+
+ return start + res;
+}
+
static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
{
RTPMuxContext *s = s1->priv_data;
void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)
{
- const uint8_t *r;
+ const uint8_t *r, *end = buf1 + size;
RTPMuxContext *s = s1->priv_data;
s->timestamp = s->cur_timestamp;
- r = ff_avc_find_startcode(buf1, buf1 + size);
- while (r < buf1 + size) {
+ if (s->nal_length_size)
+ r = avc_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end;
+ else
+ r = ff_avc_find_startcode(buf1, end);
+ while (r < end) {
const uint8_t *r1;
- while(!*(r++));
- r1 = ff_avc_find_startcode(r, buf1 + size);
- nal_send(s1, r, r1 - r, (r1 == buf1 + size));
+ if (s->nal_length_size) {
+ r1 = avc_mp4_find_startcode(r, end, s->nal_length_size);
+ if (!r1)
+ r1 = end;
+ r += s->nal_length_size;
+ } else {
+ while (!*(r++));
+ r1 = ff_avc_find_startcode(r, end);
+ }
+ nal_send(s1, r, r1 - r, r1 == end);
r = r1;
}
}