1 files changed, 69 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/png.h b/ffmpeg/libavcodec/png.h
new file mode 100644
index 0000000..948c2f7
--- /dev/null
+++ b/ffmpeg/libavcodec/png.h
@@ -0,0 +1,69 @@
+/*
+ * PNG image format
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_PNG_H
+#define AVCODEC_PNG_H
+
+#include <stdint.h>
+
+#define PNG_COLOR_MASK_PALETTE    1
+#define PNG_COLOR_MASK_COLOR      2
+#define PNG_COLOR_MASK_ALPHA      4
+
+#define PNG_COLOR_TYPE_GRAY 0
+#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
+#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
+#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
+#define PNG_ALLIMAGE  0x0004
+#define PNG_PLTE      0x0008
+
+#define NB_PASSES 7
+
+#define PNGSIG 0x89504e470d0a1a0a
+#define MNGSIG 0x8a4d4e470d0a1a0a
+
+/* Mask to determine which y pixels are valid in a pass */
+extern const uint8_t ff_png_pass_ymask[NB_PASSES];
+
+void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
+
+void ff_png_zfree(void *opaque, void *ptr);
+
+int ff_png_get_nb_channels(int color_type);
+
+/* compute the row size of an interleaved pass */
+int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
+
+void ff_add_png_paeth_prediction(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
+
+#endif /* AVCODEC_PNG_H */