qsvdec: only access hwaccel_context is the pixel format is QSV

[ffmpeg] / libavcodec / lzwenc.c

diff --git a/libavcodec/lzwenc.c b/libavcodec/lzwenc.c
index d174acdf94c37f13cf07fc98f1424bb0aadf0a10..7c37bf2094ed30a0bf59ca8c61e0be932e16dce2 100644 (file)
--- a/libavcodec/lzwenc.c
+++ b/libavcodec/lzwenc.c
@@ -2,32 +2,33 @@
  * LZW encoder
  * Copyright (c) 2007 Bartlomiej Wolowiec
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
+ * @file
  * LZW encoder
- * @file libavcodec/lzwenc.c
  * @author Bartlomiej Wolowiec
  */
 
 #include "avcodec.h"
-#include "bitstream.h"
 #include "lzw.h"
+#include "mathops.h"
+#include "put_bits.h"
 
 #define LZW_MAXBITS 12
 #define LZW_SIZTABLE (1<<LZW_MAXBITS)
@@ -58,6 +59,8 @@ typedef struct LZWEncodeState {
     int maxcode;             ///< Max value of code
     int output_bytes;        ///< Number of written bytes
     int last_code;           ///< Value of last output code or LZW_PREFIX_EMPTY
+    enum FF_LZW_MODES mode;  ///< TIFF or GIF
+    void (*put_bits)(PutBitContext *, int, unsigned); ///< GIF is LE while TIFF is BE
 }LZWEncodeState;
 
 
@@ -110,7 +113,7 @@ static inline int hashOffset(const int head)
 static inline void writeCode(LZWEncodeState * s, int c)
 {
     assert(0 <= c && c < 1 << s->bits);
-    put_bits(&s->pb, s->bits, c);
+    s->put_bits(&s->pb, s->bits, c);
 }
 
 
@@ -151,7 +154,7 @@ static inline void addCode(LZWEncodeState * s, uint8_t c, int hash_prefix, int h
 
     s->tabsize++;
 
-    if (s->tabsize >= 1 << s->bits)
+    if (s->tabsize >= (1 << s->bits) + (s->mode == FF_LZW_GIF))
         s->bits++;
 }
 
@@ -196,18 +199,22 @@ static int writtenBytes(LZWEncodeState *s){
  * @param outsize Size of output buffer
  * @param maxbits Maximum length of code
  */
-void ff_lzw_encode_init(LZWEncodeState * s, uint8_t * outbuf, int outsize, int maxbits)
+void ff_lzw_encode_init(LZWEncodeState *s, uint8_t *outbuf, int outsize,
+                        int maxbits, enum FF_LZW_MODES mode,
+                        void (*lzw_put_bits)(PutBitContext *, int, unsigned))
 {
     s->clear_code = 256;
     s->end_code = 257;
     s->maxbits = maxbits;
     init_put_bits(&s->pb, outbuf, outsize);
     s->bufsize = outsize;
-    assert(9 <= s->maxbits && s->maxbits <= s->maxbits);
+    assert(s->maxbits >= 9 && s->maxbits <= LZW_MAXBITS);
     s->maxcode = 1 << s->maxbits;
     s->output_bytes = 0;
     s->last_code = LZW_PREFIX_EMPTY;
     s->bits = 9;
+    s->mode = mode;
+    s->put_bits = lzw_put_bits;
 }
 
 /**
@@ -250,12 +257,13 @@ int ff_lzw_encode(LZWEncodeState * s, const uint8_t * inbuf, int insize)
  * @param s LZW state
  * @return Number of bytes written or -1 on error
  */
-int ff_lzw_encode_flush(LZWEncodeState * s)
+int ff_lzw_encode_flush(LZWEncodeState *s,
+                        void (*lzw_flush_put_bits)(PutBitContext *))
 {
     if (s->last_code != -1)
         writeCode(s, s->last_code);
     writeCode(s, s->end_code);
-    flush_put_bits(&s->pb);
+    lzw_flush_put_bits(&s->pb);
     s->last_code = -1;
 
     return writtenBytes(s);