decode: be more explicit about storing the last packet properties

[ffmpeg] / libavcodec / png.h

diff --git a/libavcodec/png.h b/libavcodec/png.h
index fb5ec061221c1e81fd7d8607e95dfef0e9fdda57..b8c72eebc9e2c8923e9037bd029cdff612873fa9 100644 (file)
--- a/libavcodec/png.h
+++ b/libavcodec/png.h
@@ -1,21 +1,21 @@
 /*
  * PNG image format
- * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2003 Fabrice Bellard
  *
- * 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
  */
 
@@ -23,7 +23,6 @@
 #define AVCODEC_PNG_H
 
 #include <stdint.h>
-#include <zlib.h>
 
 #define PNG_COLOR_MASK_PALETTE    1
 #define PNG_COLOR_MASK_COLOR      2
@@ -35,11 +34,13 @@
 #define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
 
+#define PNG_FILTER_TYPE_LOCO   64
 #define PNG_FILTER_VALUE_NONE  0
 #define PNG_FILTER_VALUE_SUB   1
 #define PNG_FILTER_VALUE_UP    2
 #define PNG_FILTER_VALUE_AVG   3
 #define PNG_FILTER_VALUE_PAETH 4
+#define PNG_FILTER_VALUE_MIXED 5
 
 #define PNG_IHDR      0x0001
 #define PNG_IDAT      0x0002
@@ -48,64 +49,24 @@
 
 #define NB_PASSES 7
 
-#define IOBUF_SIZE 4096
-
-typedef struct PNGContext {
-    uint8_t *bytestream;
-    uint8_t *bytestream_start;
-    uint8_t *bytestream_end;
-    AVFrame picture;
-
-    int state;
-    int width, height;
-    int bit_depth;
-    int color_type;
-    int compression_type;
-    int interlace_type;
-    int filter_type;
-    int channels;
-    int bits_per_pixel;
-    int bpp;
-
-    uint8_t *image_buf;
-    int image_linesize;
-    uint32_t palette[256];
-    uint8_t *crow_buf;
-    uint8_t *last_row;
-    uint8_t *tmp_row;
-    int pass;
-    int crow_size; /* compressed row size (include filter type) */
-    int row_size; /* decompressed row size */
-    int pass_row_size; /* decompress row size of the current pass */
-    int y;
-    z_stream zstream;
-    uint8_t buf[IOBUF_SIZE];
-} PNGContext;
-
 extern const uint8_t ff_pngsig[8];
+extern const uint8_t ff_mngsig[8];
 
 /* Mask to determine which y pixels are valid in a pass */
 extern const uint8_t ff_png_pass_ymask[NB_PASSES];
 
-/* minimum x value */
-extern const uint8_t ff_png_pass_xmin[NB_PASSES];
-
-/* x shift to get row width */
-extern const uint8_t ff_png_pass_xshift[NB_PASSES];
-
 /* Mask to determine which pixels are valid in a pass */
 extern const uint8_t ff_png_pass_mask[NB_PASSES];
 
-extern void *ff_png_zalloc(void *opaque, unsigned int items,
-                           unsigned int size);
+void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
 
-extern void ff_png_zfree(void *opaque, void *ptr);
+void ff_png_zfree(void *opaque, void *ptr);
 
-extern int ff_png_get_nb_channels(int color_type);
+int ff_png_get_nb_channels(int color_type);
 
 /* compute the row size of an interleaved pass */
-extern int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
+int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
 
-extern int ff_png_common_init(AVCodecContext *avctx);
+void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
 
-#endif
+#endif /* AVCODEC_PNG_H */