build: Allow building old API/ABI libpostproc version

[ffmpeg] / libavformat / rtpenc_h264.c

diff --git a/libavformat/rtpenc_h264.c b/libavformat/rtpenc_h264.c
index 1a486cf96e01ef577e0a72aeb94d8a4a6ca8e26b..86930bbac1aa5e641818d14115042b67757e1715 100644 (file)
--- a/libavformat/rtpenc_h264.c
+++ b/libavformat/rtpenc_h264.c
@@ -2,20 +2,20 @@
  * RTP packetization for H.264 (RFC3984)
  * Copyright (c) 2008 Luca Abeni
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -29,6 +29,21 @@
 #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;
@@ -66,12 +81,22 @@ void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)
     RTPMuxContext *s = s1->priv_data;
 
     s->timestamp = s->cur_timestamp;
-    r = ff_avc_find_startcode(buf1, end);
+    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, end);
+        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;
     }