Split video payload into multiple packets when >65k

This is the implementation of the [proposed fix](https://github.com/TokTok/c-toxcore/issues/620#issuecomment-346902071) for [this issue](https://github.com/TokTok/c-toxcore/issues/620).

1 files changed, 15 insertions, 6 deletions

diff --git a/toxav/toxav.c b/toxav/toxav.c
index deb71c49..74836691 100644
--- a/toxav/toxav.c
+++ b/toxav/toxav.c
@@ -814,13 +814,22 @@ bool toxav_video_send_frame(ToxAV *av, uint32_t friend_number, uint16_t width, u
         const vpx_codec_cx_pkt_t *pkt;
 
         while ((pkt = vpx_codec_get_cx_data(call->video.second->encoder, &iter))) {
-            if (pkt->kind == VPX_CODEC_CX_FRAME_PKT &&
-                    rtp_send_data(call->video.first, (const uint8_t *)pkt->data.frame.buf, pkt->data.frame.sz, av->m->log) < 0) {
+            if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
+                const uint8_t *buf = (const uint8_t *)pkt->data.frame.buf;
+                const uint8_t *end = buf + pkt->data.frame.sz;
 
-                pthread_mutex_unlock(call->mutex_video);
-                LOGGER_WARNING(av->m->log, "Could not send video frame: %s\n", strerror(errno));
-                rc = TOXAV_ERR_SEND_FRAME_RTP_FAILED;
-                goto END;
+                while (buf < end) {
+                    uint16_t size = MIN(UINT16_MAX, end - buf);
+
+                    if (rtp_send_data(call->video.first, buf, size, av->m->log) < 0) {
+                        pthread_mutex_unlock(call->mutex_video);
+                        LOGGER_WARNING(av->m->log, "Could not send video frame: %s\n", strerror(errno));
+                        rc = TOXAV_ERR_SEND_FRAME_RTP_FAILED;
+                        goto END;
+                    }
+
+                    buf += size;
+                }
             }
         }
     }