Canopus HQ/HQA decoder

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

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/hq_hqadsp.h

@@ -0,0 +1,38 @@
+/*
+ * Canopus HQ/HQA 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
+ */
+
+/**
+ * @file
+ * HQ/HQA variant of AAN IDCT
+ * It differs from the standard AAN IDCT in precision and in the second stage.
+ */
+
+#ifndef AVCODEC_HQ_HQADSP_H
+#define AVCODEC_HQ_HQADSP_H
+
+#include <stdint.h>
+
+typedef struct HQDSPContext {
+    void (*idct_put)(uint8_t *dst, int stride, int16_t *block);
+} HQDSPContext;
+
+void ff_hqdsp_init(HQDSPContext *c);
+
+#endif /* AVCODEC_HQ_HQADSP_H */