From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@eclectronics.org>
Date: Thu, 5 Sep 2013 17:57:22 +0100
Subject: making act segmenter

---
 ffmpeg/libavcodec/huffyuv.c | 97 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 ffmpeg/libavcodec/huffyuv.c

(limited to 'ffmpeg/libavcodec/huffyuv.c')

diff --git a/ffmpeg/libavcodec/huffyuv.c b/ffmpeg/libavcodec/huffyuv.c
new file mode 100644
index 0000000..b4ef76f
--- /dev/null
+++ b/ffmpeg/libavcodec/huffyuv.c
@@ -0,0 +1,97 @@
+/*
+ * huffyuv codec for libavcodec
+ *
+ * Copyright (c) 2002-2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * see http://www.pcisys.net/~melanson/codecs/huffyuv.txt for a description of
+ * the algorithm used
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * huffyuv codec for libavcodec.
+ */
+
+#include <stdint.h>
+
+#include "libavutil/mem.h"
+
+#include "avcodec.h"
+#include "huffyuv.h"
+
+int ff_huffyuv_generate_bits_table(uint32_t *dst, const uint8_t *len_table)
+{
+    int len, index;
+    uint32_t bits = 0;
+
+    for (len = 32; len > 0; len--) {
+        for (index = 0; index < 256; index++) {
+            if (len_table[index] == len)
+                dst[index] = bits++;
+        }
+        if (bits & 1) {
+            av_log(NULL, AV_LOG_ERROR, "Error generating huffman table\n");
+            return -1;
+        }
+        bits >>= 1;
+    }
+    return 0;
+}
+
+av_cold int ff_huffyuv_alloc_temp(HYuvContext *s)
+{
+    int i;
+
+    if (s->bitstream_bpp<24) {
+        for (i=0; i<3; i++) {
+            s->temp[i]= av_malloc(s->width + 16);
+            if (!s->temp[i])
+                return AVERROR(ENOMEM);
+        }
+    } else {
+        s->temp[0]= av_mallocz(4*s->width + 16);
+        if (!s->temp[0])
+            return AVERROR(ENOMEM);
+    }
+    return 0;
+}
+
+av_cold void ff_huffyuv_common_init(AVCodecContext *avctx)
+{
+    HYuvContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->flags = avctx->flags;
+
+    ff_dsputil_init(&s->dsp, avctx);
+
+    s->width = avctx->width;
+    s->height = avctx->height;
+
+    av_assert1(s->width > 0 && s->height > 0);
+}
+
+av_cold void ff_huffyuv_common_end(HYuvContext *s)
+{
+    int i;
+
+    for(i = 0; i < 3; i++) {
+        av_freep(&s->temp[i]);
+    }
+}
-- 
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