Updated FFMPEG to version 1.1.2, using this project: http://sourceforge.net/projects/ffmpeg4android/

project/jni/ffmpeg/libavutil/crc.c

@@ -0,0 +1,136 @@
+/*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+#include "config.h"
+#include "common.h"
+#include "bswap.h"
+#include "crc.h"
+
+#if CONFIG_HARDCODED_TABLES
+#include "crc_data.h"
+#else
+static struct {
+    uint8_t  le;
+    uint8_t  bits;
+    uint32_t poly;
+} av_crc_table_params[AV_CRC_MAX] = {
+    [AV_CRC_8_ATM]      = { 0,  8,       0x07 },
+    [AV_CRC_16_ANSI]    = { 0, 16,     0x8005 },
+    [AV_CRC_16_CCITT]   = { 0, 16,     0x1021 },
+    [AV_CRC_32_IEEE]    = { 0, 32, 0x04C11DB7 },
+    [AV_CRC_32_IEEE_LE] = { 1, 32, 0xEDB88320 },
+};
+static AVCRC av_crc_table[AV_CRC_MAX][257];
+#endif
+
+int av_crc_init(AVCRC *ctx, int le, int bits, uint32_t poly, int ctx_size)
+{
+    unsigned i, j;
+    uint32_t c;
+
+    if (bits < 8 || bits > 32 || poly >= (1LL << bits))
+        return -1;
+    if (ctx_size != sizeof(AVCRC) * 257 && ctx_size != sizeof(AVCRC) * 1024)
+        return -1;
+
+    for (i = 0; i < 256; i++) {
+        if (le) {
+            for (c = i, j = 0; j < 8; j++)
+                c = (c >> 1) ^ (poly & (-(c & 1)));
+            ctx[i] = c;
+        } else {
+            for (c = i << 24, j = 0; j < 8; j++)
+                c = (c << 1) ^ ((poly << (32 - bits)) & (((int32_t) c) >> 31));
+            ctx[i] = av_bswap32(c);
+        }
+    }
+    ctx[256] = 1;
+#if !CONFIG_SMALL
+    if (ctx_size >= sizeof(AVCRC) * 1024)
+        for (i = 0; i < 256; i++)
+            for (j = 0; j < 3; j++)
+                ctx[256 *(j + 1) + i] =
+                    (ctx[256 * j + i] >> 8) ^ ctx[ctx[256 * j + i] & 0xFF];
+#endif
+
+    return 0;
+}
+
+const AVCRC *av_crc_get_table(AVCRCId crc_id)
+{
+#if !CONFIG_HARDCODED_TABLES
+    if (!av_crc_table[crc_id][FF_ARRAY_ELEMS(av_crc_table[crc_id]) - 1])
+        if (av_crc_init(av_crc_table[crc_id],
+                        av_crc_table_params[crc_id].le,
+                        av_crc_table_params[crc_id].bits,
+                        av_crc_table_params[crc_id].poly,
+                        sizeof(av_crc_table[crc_id])) < 0)
+            return NULL;
+#endif
+    return av_crc_table[crc_id];
+}
+
+uint32_t av_crc(const AVCRC *ctx, uint32_t crc,
+                const uint8_t *buffer, size_t length)
+{
+    const uint8_t *end = buffer + length;
+
+#if !CONFIG_SMALL
+    if (!ctx[256]) {
+        while (((intptr_t) buffer & 3) && buffer < end)
+            crc = ctx[((uint8_t) crc) ^ *buffer++] ^ (crc >> 8);
+
+        while (buffer < end - 3) {
+            crc ^= av_le2ne32(*(const uint32_t *) buffer); buffer += 4;
+            crc = ctx[3 * 256 + ( crc        & 0xFF)] ^
+                  ctx[2 * 256 + ((crc >> 8 ) & 0xFF)] ^
+                  ctx[1 * 256 + ((crc >> 16) & 0xFF)] ^
+                  ctx[0 * 256 + ((crc >> 24)       )];
+        }
+    }
+#endif
+    while (buffer < end)
+        crc = ctx[((uint8_t) crc) ^ *buffer++] ^ (crc >> 8);
+
+    return crc;
+}
+
+#ifdef TEST
+int main(void)
+{
+    uint8_t buf[1999];
+    int i;
+    int p[4][3] = { { AV_CRC_32_IEEE_LE, 0xEDB88320, 0x3D5CDD04 },
+                    { AV_CRC_32_IEEE   , 0x04C11DB7, 0xC0F5BAE0 },
+                    { AV_CRC_16_ANSI   , 0x8005    , 0x1FBB     },
+                    { AV_CRC_8_ATM     , 0x07      , 0xE3       }
+    };
+    const AVCRC *ctx;
+
+    for (i = 0; i < sizeof(buf); i++)
+        buf[i] = i + i * i;
+
+    for (i = 0; i < 4; i++) {
+        ctx = av_crc_get_table(p[i][0]);
+        printf("crc %08X = %X\n", p[i][1], av_crc(ctx, 0, buf, sizeof(buf)));
+    }
+    return 0;
+}
+#endif