* LCL (LossLess Codec Library) Codec
* Copyright (c) 2002-2004 Roberto Togni
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/lcldec.c
+ * @file
* LCL (LossLess Codec Library) Video Codec
* Decoder for MSZH and ZLIB codecs
* Experimental encoder for ZLIB RGB24
#include <stdlib.h>
#include "avcodec.h"
-#include "get_bits.h"
+#include "bytestream.h"
#include "lcl.h"
+#include "libavutil/lzo.h"
#if CONFIG_ZLIB_DECODER
#include <zlib.h>
} LclDecContext;
-static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
+/**
+ * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
+ * @param destptr must be padded sufficiently for av_memcpy_backptr
+ */
+static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
{
unsigned char *destptr_bak = destptr;
unsigned char *destptr_end = destptr + destsize;
- unsigned char mask = 0;
- unsigned char maskbit = 0;
- unsigned int ofs, cnt;
+ const unsigned char *srcptr_end = srcptr + srclen;
+ unsigned mask = *srcptr++;
+ unsigned maskbit = 0x80;
- while (srclen > 0 && destptr < destptr_end) {
- if (maskbit == 0) {
- mask = *srcptr++;
- maskbit = 8;
- srclen--;
- continue;
- }
- if ((mask & (1 << (--maskbit))) == 0) {
- if (destptr + 4 > destptr_end)
- break;
- AV_WN32(destptr, AV_RN32(srcptr));
- srclen -= 4;
+ while (srcptr < srcptr_end && destptr < destptr_end) {
+ if (!(mask & maskbit)) {
+ memcpy(destptr, srcptr, 4);
destptr += 4;
srcptr += 4;
} else {
- ofs = *srcptr++;
- cnt = *srcptr++;
- ofs += cnt * 256;
- cnt = ((cnt >> 3) & 0x1f) + 1;
+ unsigned ofs = bytestream_get_le16(&srcptr);
+ unsigned cnt = (ofs >> 11) + 1;
ofs &= 0x7ff;
- srclen -= 2;
+ ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4;
- if (destptr + cnt > destptr_end) {
- cnt = destptr_end - destptr;
- }
- for (; cnt > 0; cnt--) {
- *destptr = *(destptr - ofs);
- destptr++;
+ cnt = FFMIN(cnt, destptr_end - destptr);
+ av_memcpy_backptr(destptr, ofs, cnt);
+ destptr += cnt;
+ }
+ maskbit >>= 1;
+ if (!maskbit) {
+ mask = *srcptr++;
+ while (!mask) {
+ if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
+ memcpy(destptr, srcptr, 32);
+ destptr += 32;
+ srcptr += 32;
+ mask = *srcptr++;
}
+ maskbit = 0x80;
}
}
}
+#if CONFIG_ZLIB_DECODER
+/**
+ * @brief decompress a zlib-compressed data block into decomp_buf
+ * @param src compressed input buffer
+ * @param src_len data length in input buffer
+ * @param offset offset in decomp_buf
+ * @param expected expected decompressed length
+ */
+static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
+{
+ LclDecContext *c = avctx->priv_data;
+ int zret = inflateReset(&c->zstream);
+ if (zret != Z_OK) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
+ return -1;
+ }
+ c->zstream.next_in = src;
+ c->zstream.avail_in = src_len;
+ c->zstream.next_out = c->decomp_buf + offset;
+ c->zstream.avail_out = c->decomp_size - offset;
+ zret = inflate(&c->zstream, Z_FINISH);
+ if (zret != Z_OK && zret != Z_STREAM_END) {
+ av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
+ return -1;
+ }
+ if (expected != (unsigned int)c->zstream.total_out) {
+ av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
+ expected, c->zstream.total_out);
+ return -1;
+ }
+ return c->zstream.total_out;
+}
+#endif
+
/*
*
unsigned char yq, y1q, uq, vq;
int uqvq;
unsigned int mthread_inlen, mthread_outlen;
-#if CONFIG_ZLIB_DECODER
- int zret; // Zlib return code
-#endif
unsigned int len = buf_size;
if(c->pic.data[0])
switch (c->compression) {
case COMP_MSZH:
if (c->flags & FLAG_MULTITHREAD) {
- mthread_inlen = *(unsigned int*)encoded;
- mthread_outlen = *(unsigned int*)(encoded+4);
- if (mthread_outlen > c->decomp_size) // this should not happen
- mthread_outlen = c->decomp_size;
+ mthread_inlen = AV_RL32(encoded);
+ mthread_inlen = FFMIN(mthread_inlen, len - 8);
+ mthread_outlen = AV_RL32(encoded+4);
+ mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
return -1;
}
- mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
+ mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
len == width * height * 3)
break;
- zret = inflateReset(&c->zstream);
- if (zret != Z_OK) {
- av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
- return -1;
- }
if (c->flags & FLAG_MULTITHREAD) {
- mthread_inlen = *(unsigned int*)encoded;
- mthread_outlen = *(unsigned int*)(encoded+4);
- if (mthread_outlen > c->decomp_size)
- mthread_outlen = c->decomp_size;
- c->zstream.next_in = encoded + 8;
- c->zstream.avail_in = mthread_inlen;
- c->zstream.next_out = c->decomp_buf;
- c->zstream.avail_out = c->decomp_size;
- zret = inflate(&c->zstream, Z_FINISH);
- if (zret != Z_OK && zret != Z_STREAM_END) {
- av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
- return -1;
- }
- if (mthread_outlen != (unsigned int)c->zstream.total_out) {
- av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
- mthread_outlen, c->zstream.total_out);
- return -1;
- }
- zret = inflateReset(&c->zstream);
- if (zret != Z_OK) {
- av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
- return -1;
- }
- c->zstream.next_in = encoded + 8 + mthread_inlen;
- c->zstream.avail_in = len - mthread_inlen;
- c->zstream.next_out = c->decomp_buf + mthread_outlen;
- c->zstream.avail_out = c->decomp_size - mthread_outlen;
- zret = inflate(&c->zstream, Z_FINISH);
- if (zret != Z_OK && zret != Z_STREAM_END) {
- av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
- return -1;
- }
- if (mthread_outlen != (unsigned int)c->zstream.total_out) {
- av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
- mthread_outlen, c->zstream.total_out);
- return -1;
- }
+ int ret;
+ mthread_inlen = AV_RL32(encoded);
+ mthread_inlen = FFMIN(mthread_inlen, len - 8);
+ mthread_outlen = AV_RL32(encoded+4);
+ mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
+ ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
+ if (ret < 0) return ret;
+ ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
+ mthread_outlen, mthread_outlen);
+ if (ret < 0) return ret;
} else {
- c->zstream.next_in = encoded;
- c->zstream.avail_in = len;
- c->zstream.next_out = c->decomp_buf;
- c->zstream.avail_out = c->decomp_size;
- zret = inflate(&c->zstream, Z_FINISH);
- if (zret != Z_OK && zret != Z_STREAM_END) {
- av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
- return -1;
- }
- if (c->decomp_size != (unsigned int)c->zstream.total_out) {
- av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
- c->decomp_size, c->zstream.total_out);
- return -1;
- }
+ int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
+ if (ret < 0) return ret;
}
encoded = c->decomp_buf;
len = c->decomp_size;
{
LclDecContext * const c = avctx->priv_data;
unsigned int basesize = avctx->width * avctx->height;
- unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
+ unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
unsigned int max_decomp_size;
- c->pic.data[0] = NULL;
-
-#if CONFIG_ZLIB_DECODER
- // Needed if zlib unused or init aborted before inflateInit
- memset(&c->zstream, 0, sizeof(z_stream));
-#endif
-
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
return 1;
}
- if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
- return 1;
- }
-
/* Check codec type */
if ((avctx->codec_id == CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
(avctx->codec_id == CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
}
/* Detect compression method */
- c->compression = avctx->extradata[5];
+ c->compression = (int8_t)avctx->extradata[5];
switch (avctx->codec_id) {
case CODEC_ID_MSZH:
switch (c->compression) {
av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
if (c->flags & FLAG_NULLFRAME)
av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
- if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
+ if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
if (c->flags & FLAGMASK_UNUSED)
av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
zret = inflateInit(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
+ av_freep(&c->decomp_buf);
return 1;
}
}
{
LclDecContext * const c = avctx->priv_data;
+ av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
#if CONFIG_ZLIB_DECODER
- inflateEnd(&c->zstream);
+ if (avctx->codec_id == CODEC_ID_ZLIB)
+ inflateEnd(&c->zstream);
#endif
return 0;
}
#if CONFIG_MSZH_DECODER
-AVCodec mszh_decoder = {
- "mszh",
- CODEC_TYPE_VIDEO,
- CODEC_ID_MSZH,
- sizeof(LclDecContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_mszh_decoder = {
+ .name = "mszh",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_MSZH,
+ .priv_data_size = sizeof(LclDecContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
};
#endif
#if CONFIG_ZLIB_DECODER
-AVCodec zlib_decoder = {
- "zlib",
- CODEC_TYPE_VIDEO,
- CODEC_ID_ZLIB,
- sizeof(LclDecContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_zlib_decoder = {
+ .name = "zlib",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_ZLIB,
+ .priv_data_size = sizeof(LclDecContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
};
#endif
projects / ffmpeg / blobdiff