Deobfuscate LE SHOW_[SU]BITS; these are simple sign/zero-extend

[ffmpeg] / libavcodec / vc1.h

diff --git a/libavcodec/vc1.h b/libavcodec/vc1.h
index ab2b231cce91d0af50c0e00bef9a0608640ccc81..d5f0e054655e058c47b7733f8cdba802e3a8bf0c 100644 (file)
--- a/libavcodec/vc1.h
+++ b/libavcodec/vc1.h
@@ -20,6 +20,13 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#ifndef AVCODEC_VC1_H
+#define AVCODEC_VC1_H
+
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "intrax8.h"
+
 /** Markers used in VC-1 AP frame data */
 //@{
 enum VC1Code{
@@ -35,7 +42,6 @@ enum VC1Code{
 
 #define IS_MARKER(x) (((x) & ~0xFF) == VC1_CODE_RES0)
 
-#ifndef VC1_PARSER_ONLY
 /** Available Profiles */
 //@{
 enum Profile {
@@ -121,9 +127,6 @@ enum TransformTypes {
 };
 //@}
 
-/** One more frame type */
-#define BI_TYPE 7
-
 enum CodingSet {
     CS_HIGH_MOT_INTRA = 0,
     CS_HIGH_MOT_INTER,
@@ -146,11 +149,12 @@ enum COTypes {
 
 
 /** The VC1 Context
- * @fixme Change size wherever another size is more efficient
+ * @todo Change size wherever another size is more efficient
  * Many members are only used for Advanced Profile
  */
 typedef struct VC1Context{
     MpegEncContext s;
+    IntraX8Context x8;
 
     int bits;
 
@@ -176,6 +180,7 @@ typedef struct VC1Context{
     int interlace;        ///< Progressive/interlaced (RPTFTM syntax element)
     int tfcntrflag;       ///< TFCNTR present
     int panscanflag;      ///< NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} present
+    int refdist_flag;     ///< REFDIST syntax element present in II, IP, PI or PP field picture headers
     int extended_dmv;     ///< Additional extended dmv range at P/B frame-level
     int color_prim;       ///< 8bits, chroma coordinates of the color primaries
     int transfer_char;    ///< 8bits, Opto-electronic transfer characteristics
@@ -209,6 +214,8 @@ typedef struct VC1Context{
     int k_y;              ///< Number of bits for MVs (depends on MV range)
     int range_x, range_y; ///< MV range
     uint8_t pq, altpq;    ///< Current/alternate frame quantizer scale
+    const uint8_t* zz_8x4;///< Zigzag scan table for TT_8x4 coding mode
+    const uint8_t* zz_4x8;///< Zigzag scan table for TT_4x8 coding mode
     /** pquant parameters */
     //@{
     uint8_t dquantfrm;
@@ -297,5 +304,65 @@ typedef struct VC1Context{
 
     int p_frame_skipped;
     int bi_type;
+    int x8_type;
+
+    uint32_t *cbp_base, *cbp;
+    uint8_t bfraction_lut_index;///< Index for BFRACTION value (see Table 40, reproduced into ff_vc1_bfraction_lut[])
+    uint8_t broken_link;        ///< Broken link flag (BROKEN_LINK syntax element)
+    uint8_t closed_entry;       ///< Closed entry point flag (CLOSED_ENTRY syntax element)
+
+    int parse_only;             ///< Context is used within parser
+
+    int warn_interlaced;
 } VC1Context;
-#endif
+
+/** Find VC-1 marker in buffer
+ * @return position where next marker starts or end of buffer if no marker found
+ */
+static av_always_inline const uint8_t* find_next_marker(const uint8_t *src, const uint8_t *end)
+{
+    uint32_t mrk = 0xFFFFFFFF;
+
+    if(end-src < 4) return end;
+    while(src < end){
+        mrk = (mrk << 8) | *src++;
+        if(IS_MARKER(mrk))
+            return src-4;
+    }
+    return end;
+}
+
+static av_always_inline int vc1_unescape_buffer(const uint8_t *src, int size, uint8_t *dst)
+{
+    int dsize = 0, i;
+
+    if(size < 4){
+        for(dsize = 0; dsize < size; dsize++) *dst++ = *src++;
+        return size;
+    }
+    for(i = 0; i < size; i++, src++) {
+        if(src[0] == 3 && i >= 2 && !src[-1] && !src[-2] && i < size-1 && src[1] < 4) {
+            dst[dsize++] = src[1];
+            src++;
+            i++;
+        } else
+            dst[dsize++] = *src;
+    }
+    return dsize;
+}
+
+/**
+ * Decode Simple/Main Profiles sequence header
+ * @see Figure 7-8, p16-17
+ * @param avctx Codec context
+ * @param gb GetBit context initialized from Codec context extra_data
+ * @return Status
+ */
+int vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
+
+int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb);
+
+int vc1_parse_frame_header    (VC1Context *v, GetBitContext *gb);
+int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext *gb);
+
+#endif /* AVCODEC_VC1_H */