[FFmpeg-devel] [PATCH 1/1] libavformat/rtpenc_jpeg.c: add support for the DRI marker

[Sebastien Cote <sebas642@gmail.com>]

This patch adds support for the DRI marker in the JPEG RTP payloader.

---
 libavformat/rtpenc_jpeg.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/libavformat/rtpenc_jpeg.c b/libavformat/rtpenc_jpeg.c
index e4e95931f4..60f56680e2 100644
--- a/libavformat/rtpenc_jpeg.c
+++ b/libavformat/rtpenc_jpeg.c
@@ -33,6 +33,7 @@ void ff_rtp_send_jpeg(AVFormatContext *s1, const
uint8_t *buf, int size)
     uint8_t type = 2; /* initialized non-0/1 value for RTP/JPEG type check*/
     uint8_t w, h;
     uint8_t *p;
+    uint16_t rst_marker_interval = 0;
     int off = 0; /* fragment offset of the current JPEG frame */
     int len;
     int i;
@@ -155,6 +156,22 @@ void ff_rtp_send_jpeg(AVFormatContext *s1, const
uint8_t *buf, int size)
                     dht_size = 0;
                     continue;
             }
+        } else if (buf[i + 1] == DRI) {
+            uint16_t dri_size = 0;
+            if (i + 5 > size) {
+                av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n");
+                return;
+            }
+
+            dri_size = AV_RB16(&buf[i + 2]);
+            rst_marker_interval = AV_RB16(&buf[i + 4]);
+
+            if (i + 1 + dri_size > size) {
+                av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n");
+                return;
+            }
+
+            i += 1 + dri_size;
         } else if (buf[i + 1] == SOS) {
             /* SOS is last marker in the header */
             i += AV_RB16(&buf[i + 2]) + 2;
@@ -196,10 +213,16 @@ void ff_rtp_send_jpeg(AVFormatContext *s1, const
uint8_t *buf, int size)
         }
     }

+    if (rst_marker_interval > 0)
+        type += 64;
+
     p = s->buf_ptr;
     while (size > 0) {
         int hdr_size = 8;

+        if (rst_marker_interval > 0)
+            hdr_size += 4;
+
         if (off == 0 && nb_qtables)
             hdr_size += 4 + 64 * nb_qtables;

@@ -214,6 +237,11 @@ void ff_rtp_send_jpeg(AVFormatContext *s1, const
uint8_t *buf, int size)
         bytestream_put_byte(&p, w);
         bytestream_put_byte(&p, h);

+        if (rst_marker_interval > 0) {
+            bytestream_put_be16(&p, rst_marker_interval);
+            bytestream_put_be16(&p, 0xFFFF);
+        }
+
         if (off == 0 && nb_qtables) {
             /* set quantization tables header */
             bytestream_put_byte(&p, 0);
--
2.34.1
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