Canopus HQX decoder

Based on work by Kostya Shishkov <kostya.shishkov@gmail.com>.

1 files changed, 65 insertions, 0 deletions

diff --git a/libavcodec/hqx.h b/libavcodec/hqx.h
new file mode 100644
index 0000000000..e72191fd90
--- /dev/null
+++ b/libavcodec/hqx.h
@@ -0,0 +1,65 @@
+/*
+ * Canopus HQX decoder
+ *
+ * This file is part of Libav.
+ *
+ * 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.
+ *
+ * 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_HQX_H
+#define AVCODEC_HQX_H
+
+#include <stdint.h>
+#include "libavutil/mem.h"
+#include "get_bits.h"
+
+enum HQXACMode {
+    HQX_AC_Q0 = 0,
+    HQX_AC_Q8,
+    HQX_AC_Q16,
+    HQX_AC_Q32,
+    HQX_AC_Q64,
+    HQX_AC_Q128,
+    NUM_HQX_AC
+};
+
+typedef struct HQXLUT {
+    int16_t lev;
+    uint8_t run;
+    int8_t  bits;
+} HQXLUT;
+
+typedef struct HQXAC {
+    int lut_bits, extra_bits;
+    const HQXLUT *lut;
+} HQXAC;
+
+typedef struct HQXContext {
+    int format, dcb, width, height;
+    int interlaced;
+
+    DECLARE_ALIGNED(16, int16_t, block)[16][64];
+
+    VLC cbp_vlc;
+    VLC dc_vlc[3];
+} HQXContext;
+
+#define HQX_DC_VLC_BITS 9
+
+extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
+
+int ff_hqx_init_vlcs(HQXContext *ctx);
+
+#endif /* AVCODEC_HQX_H */