* LZO 1x decompression
* Copyright (c) 2006 Reimar Doeffinger
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
c->out = dst + cnt;
}
-static inline void memcpy_backptr(uint8_t *dst, int back, int cnt);
-
/**
* @brief Copies previously decoded bytes to current position.
- * @param back how many bytes back we start
+ * @param back how many bytes back we start, must be > 0
* @param cnt number of bytes to copy, must be >= 0
*
* cnt > back is valid, this will copy the bytes we just copied,
cnt = FFMAX(c->out_end - dst, 0);
c->error |= AV_LZO_OUTPUT_FULL;
}
- memcpy_backptr(dst, back, cnt);
+ av_memcpy_backptr(dst, back, cnt);
c->out = dst + cnt;
}
-static inline void memcpy_backptr(uint8_t *dst, int back, int cnt)
-{
- const uint8_t *src = &dst[-back];
- if (back == 1) {
- memset(dst, *src, cnt);
- } else {
- if (cnt >= 4) {
- AV_COPY16U(dst, src);
- AV_COPY16U(dst + 2, src + 2);
- src += 4;
- dst += 4;
- cnt -= 4;
- }
- if (cnt >= 8) {
- AV_COPY16U(dst, src);
- AV_COPY16U(dst + 2, src + 2);
- AV_COPY16U(dst + 4, src + 4);
- AV_COPY16U(dst + 6, src + 6);
- src += 8;
- dst += 8;
- cnt -= 8;
- }
- if (cnt > 0) {
- int blocklen = back;
- while (cnt > blocklen) {
- memcpy(dst, src, blocklen);
- dst += blocklen;
- cnt -= blocklen;
- blocklen <<= 1;
- }
- memcpy(dst, src, cnt);
- }
- }
-}
-
-void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
-{
- memcpy_backptr(dst, back, cnt);
-}
-
int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen)
{
int state = 0;
int x;
LZOContext c;
- if (!*outlen || !*inlen) {
+ if (*outlen <= 0 || *inlen <= 0) {
int res = 0;
- if (!*outlen)
+ if (*outlen <= 0)
res |= AV_LZO_OUTPUT_FULL;
- if (!*inlen)
+ if (*inlen <= 0)
res |= AV_LZO_INPUT_DEPLETED;
return res;
}
*outlen = c.out_end - c.out;
return c.error;
}
+
+#ifdef TEST
+#include <stdio.h>
+#include <lzo/lzo1x.h>
+#include "log.h"
+#define MAXSZ (10*1024*1024)
+
+/* Define one of these to 1 if you wish to benchmark liblzo
+ * instead of our native implementation. */
+#define BENCHMARK_LIBLZO_SAFE 0
+#define BENCHMARK_LIBLZO_UNSAFE 0
+
+int main(int argc, char *argv[]) {
+ FILE *in = fopen(argv[1], "rb");
+ uint8_t *orig = av_malloc(MAXSZ + 16);
+ uint8_t *comp = av_malloc(2*MAXSZ + 16);
+ uint8_t *decomp = av_malloc(MAXSZ + 16);
+ size_t s = fread(orig, 1, MAXSZ, in);
+ lzo_uint clen = 0;
+ long tmp[LZO1X_MEM_COMPRESS];
+ int inlen, outlen;
+ int i;
+ av_log_set_level(AV_LOG_DEBUG);
+ lzo1x_999_compress(orig, s, comp, &clen, tmp);
+ for (i = 0; i < 300; i++) {
+START_TIMER
+ inlen = clen; outlen = MAXSZ;
+#if BENCHMARK_LIBLZO_SAFE
+ if (lzo1x_decompress_safe(comp, inlen, decomp, &outlen, NULL))
+#elif BENCHMARK_LIBLZO_UNSAFE
+ if (lzo1x_decompress(comp, inlen, decomp, &outlen, NULL))
+#else
+ if (av_lzo1x_decode(decomp, &outlen, comp, &inlen))
+#endif
+ av_log(NULL, AV_LOG_ERROR, "decompression error\n");
+STOP_TIMER("lzod")
+ }
+ if (memcmp(orig, decomp, s))
+ av_log(NULL, AV_LOG_ERROR, "decompression incorrect\n");
+ else
+ av_log(NULL, AV_LOG_ERROR, "decompression OK\n");
+ return 0;
+}
+#endif