Support Motion JPEG

jdmarker.c

 /*
  * jdmarker.c
  *
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * This file is part of the Independent JPEG Group's software.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file contains routines to decode JPEG datastream markers.
  * Most of the complexity arises from our desire to support input
  * suspension: if not all of the data for a marker is available,
@@ skipping 922 matching lines @@
   INPUT_BYTE(cinfo, c2, return FALSE);
   if (c != 0xFF || c2 != (int) M_SOI)
     ERREXIT2(cinfo, JERR_NO_SOI, c, c2);
 
   cinfo->unread_marker = c2;
 
   INPUT_SYNC(cinfo);
   return TRUE;
 }
 
+#ifdef MOTION_JPEG_SUPPORTED
+
+/* The default Huffman tables used by motion JPEG frames. When a motion JPEG
+ * frame does not have DHT tables, we should use the huffman tables suggested by
+ * the JPEG standard. Each of these tables represents a member of the JHUFF_TBLS
+ * struct so we can just copy it to the according JHUFF_TBLS member.
+ */
+/* DC table 0 */
+LOCAL(const unsigned char) mjpg_dc0_bits[] = {
+  0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+LOCAL(const unsigned char) mjpg_dc0_huffval[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0A, 0x0B
+};
+
+/* DC table 1 */
+LOCAL(const unsigned char) mjpg_dc1_bits[] = {
+  0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+  0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+LOCAL(const unsigned char) mjpg_dc1_huffval[] = {
+  0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+  0x08, 0x09, 0x0A, 0x0B
+};
+  
+/* AC table 0 */
+LOCAL(const unsigned char) mjpg_ac0_bits[] = {
+  0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
+  0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D
+};
+
+LOCAL(const unsigned char) mjpg_ac0_huffval[] = {
+  0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
+  0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
+  0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08,
+  0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
+  0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16,
+  0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
+  0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
+  0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
+  0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+  0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
+  0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
+  0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
+  0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
+  0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
+  0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
+  0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
+  0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,
+  0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
+  0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
+  0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
+  0xF9, 0xFA
+};
+
+/* AC table 1 */
+LOCAL(const unsigned char) mjpg_ac1_bits[] = {
+  0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,
+  0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77
+};
+
+LOCAL(const unsigned char) mjpg_ac1_huffval[] = {
+  0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
+  0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
+  0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
+  0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
+  0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34,
+  0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
+  0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38,
+  0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+  0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
+  0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
+  0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+  0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+  0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
+  0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
+  0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4,
+  0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
+  0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
+  0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
+  0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
+  0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
+  0xF9, 0xFA
+};
+
+/* Loads the default Huffman tables used by motion JPEG frames. This function
+ * just copies the huffman tables suggested in the JPEG standard when we have
+ * not load them.
+ */
+LOCAL(void)
+mjpg_load_huff_tables (j_decompress_ptr cinfo)
+{
+  JHUFF_TBL *htblptr;
+
+  if (! cinfo->dc_huff_tbl_ptrs[0]) {
+    htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+    MEMZERO(htblptr, SIZEOF(JHUFF_TBL));
+    MEMCOPY(&htblptr->bits[1], mjpg_dc0_bits, SIZEOF(mjpg_dc0_bits));
+    MEMCOPY(&htblptr->huffval[0], mjpg_dc0_huffval, SIZEOF(mjpg_dc0_huffval));
+    cinfo->dc_huff_tbl_ptrs[0] = htblptr;
+  }
+
+  if (! cinfo->dc_huff_tbl_ptrs[1]) {
+    htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+    MEMZERO(htblptr, SIZEOF(JHUFF_TBL));
+    MEMCOPY(&htblptr->bits[1], mjpg_dc1_bits, SIZEOF(mjpg_dc1_bits));
+    MEMCOPY(&htblptr->huffval[0], mjpg_dc1_huffval, SIZEOF(mjpg_dc1_huffval));
+    cinfo->dc_huff_tbl_ptrs[1] = htblptr;
+  }
+
+  if (! cinfo->ac_huff_tbl_ptrs[0]) {
+    htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+    MEMZERO(htblptr, SIZEOF(JHUFF_TBL));
+    MEMCOPY(&htblptr->bits[1], mjpg_ac0_bits, SIZEOF(mjpg_ac0_bits));
+    MEMCOPY(&htblptr->huffval[0], mjpg_ac0_huffval, SIZEOF(mjpg_ac0_huffval));
+    cinfo->ac_huff_tbl_ptrs[0] = htblptr;
+  }
+
+  if (! cinfo->ac_huff_tbl_ptrs[1]) {
+    htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
+    MEMZERO(htblptr, SIZEOF(JHUFF_TBL));
+    MEMCOPY(&htblptr->bits[1], mjpg_ac1_bits, SIZEOF(mjpg_ac1_bits));
+    MEMCOPY(&htblptr->huffval[0], mjpg_ac1_huffval, SIZEOF(mjpg_ac1_huffval));
+    cinfo->ac_huff_tbl_ptrs[1] = htblptr;
+  }
+}
+
+#else
+
+#define mjpg_load_huff_tables(cinfo)
+
+#endif /* MOTION_JPEG_SUPPORTED */
+
 
 /*
  * Read markers until SOS or EOI.
  *
  * Returns same codes as are defined for jpeg_consume_input:
  * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
  */
 
 METHODDEF(int)
 read_markers (j_decompress_ptr cinfo)
@@ skipping 49 matching lines @@
     case M_SOF7:                /* Differential lossless, Huffman */
     case M_JPG:                 /* Reserved for JPEG extensions */
     case M_SOF11:               /* Lossless, arithmetic */
     case M_SOF13:               /* Differential sequential, arithmetic */
     case M_SOF14:               /* Differential progressive, arithmetic */
     case M_SOF15:               /* Differential lossless, arithmetic */
       ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker);
       break;
 
     case M_SOS:
+      mjpg_load_huff_tables(cinfo);
       if (! get_sos(cinfo))
         return JPEG_SUSPENDED;
       cinfo->unread_marker = 0; /* processed the marker */
       return JPEG_REACHED_SOS;
     
     case M_EOI:
       TRACEMS(cinfo, 1, JTRC_EOI);
       cinfo->unread_marker = 0; /* processed the marker */
       return JPEG_REACHED_EOI;
       
@@ skipping 329 matching lines @@
 {
   my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
 
   if (marker_code == (int) M_COM)
     marker->process_COM = routine;
   else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)
     marker->process_APPn[marker_code - (int) M_APP0] = routine;
   else
     ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
 }