rtpjpegdepay: use width/height from payload

Use the width and the height from the payload headers and set them on the
output caps for added awesomeness.

Fix quant parsing, we need to check the type in the lower 6 bits.

Add first bits of caching quantization tables.

gst/rtp/gstrtpjpegdepay.c

@@ -338,7 +338,7 @@ MakeHeaders (guint8 * p, int type, int width, int height, guint8 * qt,
   *p++ = width;                 /* width lsb */
   *p++ = 3;                     /* number of components */
   *p++ = 0;                     /* comp 0 */
-  if (type == 0)
+  if ((type & 0x3f) == 0)
     *p++ = 0x21;                /* hsamp = 2, vsamp = 1 */
   else
     *p++ = 0x22;                /* hsamp = 2, vsamp = 2 */
@@ -380,10 +380,11 @@ MakeHeaders (guint8 * p, int type, int width, int height, guint8 * qt,
 static gboolean
 gst_rtp_jpeg_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
 {
+  GstRtpJPEGDepay *rtpjpegdepay;
   GstStructure *structure;
-  GstCaps *outcaps;
   gint clock_rate;
-  gboolean res;
+
+  rtpjpegdepay = GST_RTP_JPEG_DEPAY (depayload);
 
   structure = gst_caps_get_structure (caps, 0);
 
@@ -391,13 +392,10 @@ gst_rtp_jpeg_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
     clock_rate = 90000;
   depayload->clock_rate = clock_rate;
 
-  outcaps =
-      gst_caps_new_simple ("image/jpeg", "framerate", GST_TYPE_FRACTION, 0, 1,
-      NULL);
-  res = gst_pad_set_caps (depayload->srcpad, outcaps);
-  gst_caps_unref (outcaps);
+  rtpjpegdepay->width = 0;
+  rtpjpegdepay->height = 0;
 
-  return res;
+  return TRUE;
 }
 
 static GstBuffer *
@@ -441,6 +439,9 @@ gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
   width = payload[6] * 8;
   height = payload[7] * 8;
 
+  if (width == 0 || height == 0)
+    goto invalid_dimension;
+
   GST_DEBUG_OBJECT (rtpjpegdepay, "frag %u, type %u, Q %d, width %u, height %u",
       frag_offset, type, Q, width, height);
 
@@ -497,7 +498,10 @@ gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
     if (length > payload_len)
       goto empty_packet;
 
-    qtable = payload;
+    if (length > 0)
+      qtable = payload;
+    else
+      qtable = rtpjpegdepay->qtables[Q];
 
     payload += length;
     header_len += length;
@@ -511,6 +515,22 @@ gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
   if (frag_offset == 0) {
     guint size;
 
+    if (rtpjpegdepay->width != width || rtpjpegdepay->height != height) {
+      GstCaps *outcaps;
+
+      outcaps =
+          gst_caps_new_simple ("image/jpeg", "framerate", GST_TYPE_FRACTION, 0,
+          1, "width", G_TYPE_INT, width, "height", G_TYPE_INT, height, NULL);
+      gst_pad_set_caps (depayload->srcpad, outcaps);
+      gst_caps_unref (outcaps);
+
+      rtpjpegdepay->width = width;
+      rtpjpegdepay->height = height;
+    }
+
+    GST_LOG_OBJECT (rtpjpegdepay, "first packet, length %" G_GUINT16_FORMAT,
+        length);
+
     /* first packet */
     if (length == 0) {
       if (Q < 128) {
@@ -527,6 +547,9 @@ gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
         }
         /* all 8 bit quantizers */
         precision = 0;
+      } else {
+        if (!qtable)
+          goto no_qtable;
       }
     }
     /* max header length, should be big enough */
@@ -534,7 +557,7 @@ gst_rtp_jpeg_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
     size = MakeHeaders (GST_BUFFER_DATA (outbuf), type,
         width, height, qtable, precision, dri);
 
-    GST_DEBUG_OBJECT (rtpjpegdepay, "pushing %u bytes header", size);
+    GST_DEBUG_OBJECT (rtpjpegdepay, "pushing %u bytes of header", size);
 
     GST_BUFFER_SIZE (outbuf) = size;
 
@@ -586,6 +609,17 @@ empty_packet:
         ("Empty Payload."), (NULL));
     return NULL;
   }
+invalid_dimension:
+  {
+    GST_ELEMENT_WARNING (rtpjpegdepay, STREAM, FORMAT,
+        ("Invalid Dimension %dx%d.", width, height), (NULL));
+    return NULL;
+  }
+no_qtable:
+  {
+    GST_WARNING_OBJECT (rtpjpegdepay, "no qtable");
+    return NULL;
+  }
 }
 
 gboolean

gst/rtp/gstrtpjpegdepay.h

@@ -48,6 +48,8 @@ struct _GstRtpJPEGDepay
 
   /* cached quant tables */
   guint8 * qtables[255];
+
+  gint width, height;
 };
 
 struct _GstRtpJPEGDepayClass