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* LCL (LossLess Codec Library) Codec
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* Copyright (c) 2002-2004 Roberto Togni
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* LCL (LossLess Codec Library) Video Codec
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* Decoder for MSZH and ZLIB codecs
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* Experimental encoder for ZLIB RGB24
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* Ver2.23 By Kenji Oshima 2000.09.20
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* avimszh.dll, avizlib.dll
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* A description of the decoding algorithm can be found here:
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* http://www.pcisys.net/~melanson/codecs
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* Supports: BGR24 (RGB 24bpp)
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#include "bitstream.h"
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#define IMGTYPE_YUV111 0
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#define IMGTYPE_YUV422 1
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#define IMGTYPE_RGB24 2
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#define IMGTYPE_YUV411 3
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#define IMGTYPE_YUV211 4
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#define IMGTYPE_YUV420 5
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#define COMP_MSZH_NOCOMP 1
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#define COMP_ZLIB_HISPEED 1
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#define COMP_ZLIB_HICOMP 9
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#define COMP_ZLIB_NORMAL -1
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#define FLAG_MULTITHREAD 1
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#define FLAG_NULLFRAME 2
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#define FLAG_PNGFILTER 4
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#define FLAGMASK_UNUSED 0xf8
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#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
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#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
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typedef struct LclContext {
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AVCodecContext *avctx;
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// Decompressed data size
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unsigned int decomp_size;
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// Decompression buffer
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unsigned char* decomp_buf;
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// Maximum compressed data size
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unsigned int max_comp_size;
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// Compression buffer
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unsigned char* comp_buf;
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static inline unsigned char fix (int pix14)
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tmp = (pix14 + 0x80000) >> 20;
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static inline unsigned char get_b (unsigned char yq, signed char bq)
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return fix((yq << 20) + bq * 1858076);
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static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
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return fix((yq << 20) - bq * 360857 - rq * 748830);
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static inline unsigned char get_r (unsigned char yq, signed char rq)
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return fix((yq << 20) + rq * 1470103);
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static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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unsigned char *destptr_bak = destptr;
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unsigned char *destptr_end = destptr + destsize;
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unsigned char mask = 0;
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unsigned char maskbit = 0;
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unsigned int ofs, cnt;
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while ((srclen > 0) && (destptr < destptr_end)) {
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if ((mask & (1 << (--maskbit))) == 0) {
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if (destptr + 4 > destptr_end)
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*(int*)destptr = *(int*)srcptr;
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cnt = ((cnt >> 3) & 0x1f) + 1;
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if (destptr + cnt > destptr_end) {
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cnt = destptr_end - destptr;
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for (; cnt > 0; cnt--) {
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*(destptr) = *(destptr - ofs);
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return (destptr - destptr_bak);
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
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LclContext * const c = (LclContext *)avctx->priv_data;
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unsigned char *encoded = (unsigned char *)buf;
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unsigned int pixel_ptr;
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unsigned char *outptr;
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unsigned int width = avctx->width; // Real image width
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unsigned int height = avctx->height; // Real image height
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unsigned int mszh_dlen;
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unsigned char yq, y1q, uq, vq;
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unsigned int mthread_inlen, mthread_outlen;
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int zret; // Zlib return code
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unsigned int len = buf_size;
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avctx->release_buffer(avctx, &c->pic);
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c->pic.reference = 0;
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
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if(avctx->get_buffer(avctx, &c->pic) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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outptr = c->pic.data[0]; // Output image pointer
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/* Decompress frame */
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switch (avctx->codec_id) {
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switch (c->compression) {
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if (c->flags & FLAG_MULTITHREAD) {
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mthread_inlen = *((unsigned int*)encoded);
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mthread_outlen = *((unsigned int*)(encoded+4));
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if (mthread_outlen > c->decomp_size) // this should not happen
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mthread_outlen = c->decomp_size;
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mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
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if (mthread_outlen != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
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mthread_outlen, mszh_dlen);
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mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
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c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
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if (mthread_outlen != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
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mthread_outlen, mszh_dlen);
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encoded = c->decomp_buf;
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len = c->decomp_size;
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mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
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if (c->decomp_size != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
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c->decomp_size, mszh_dlen);
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encoded = c->decomp_buf;
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case COMP_MSZH_NOCOMP:
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
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/* Using the original dll with normal compression (-1) and RGB format
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* gives a file with ZLIB fourcc, but frame is really uncompressed.
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* To be sure that's true check also frame size */
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if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
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(len == width * height * 3))
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zret = inflateReset(&(c->zstream));
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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if (c->flags & FLAG_MULTITHREAD) {
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mthread_inlen = *((unsigned int*)encoded);
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mthread_outlen = *((unsigned int*)(encoded+4));
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if (mthread_outlen > c->decomp_size)
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mthread_outlen = c->decomp_size;
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c->zstream.next_in = encoded + 8;
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c->zstream.avail_in = mthread_inlen;
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c->zstream.next_out = c->decomp_buf;
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c->zstream.avail_out = c->decomp_size;
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zret = inflate(&(c->zstream), Z_FINISH);
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if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
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av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
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if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
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av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
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mthread_outlen, c->zstream.total_out);
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zret = inflateReset(&(c->zstream));
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av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
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c->zstream.next_in = encoded + 8 + mthread_inlen;
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c->zstream.avail_in = len - mthread_inlen;
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c->zstream.next_out = c->decomp_buf + mthread_outlen;
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c->zstream.avail_out = c->decomp_size - mthread_outlen;
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zret = inflate(&(c->zstream), Z_FINISH);
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if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
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av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
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if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
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av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
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mthread_outlen, c->zstream.total_out);
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c->zstream.next_in = encoded;
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c->zstream.avail_in = len;
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c->zstream.next_out = c->decomp_buf;
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c->zstream.avail_out = c->decomp_size;
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zret = inflate(&(c->zstream), Z_FINISH);
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if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
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if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
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av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
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c->decomp_size, c->zstream.total_out);
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encoded = c->decomp_buf;
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len = c->decomp_size;;
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av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
352
/* Apply PNG filter */
353
if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
354
switch (c->imgtype) {
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width * 3;
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yq = encoded[pixel_ptr++];
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uqvq = encoded[pixel_ptr++];
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uqvq+=(encoded[pixel_ptr++] << 8);
362
for (col = 1; col < width; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
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encoded[pixel_ptr+1] = (uqvq) & 0xff;
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encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width * 2;
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for (col = 0; col < width/4; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
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encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
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encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
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encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width / 2 * 3;
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for (col = 0; col < width/4; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
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encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width * 2;
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for (col = 0; col < width/2; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
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for (row = 0; row < height/2; row++) {
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pixel_ptr = row * width * 3;
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yq = y1q = uq = vq =0;
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for (col = 0; col < width/2; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
426
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
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/* Convert colorspace */
438
switch (c->imgtype) {
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for (row = height - 1; row >= 0; row--) {
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pixel_ptr = row * c->pic.linesize[0];
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for (col = 0; col < width; col++) {
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outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
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outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
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outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
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for (row = height - 1; row >= 0; row--) {
452
pixel_ptr = row * c->pic.linesize[0];
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for (col = 0; col < width/4; col++) {
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outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
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outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
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outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
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outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
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outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
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outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
460
outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
461
outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
462
outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
463
outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
464
outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
465
outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
471
for (row = height - 1; row >= 0; row--) {
472
pixel_ptr = row * c->pic.linesize[0];
473
for (col = 0; col < width; col++) {
474
outptr[pixel_ptr++] = encoded[0];
475
outptr[pixel_ptr++] = encoded[1];
476
outptr[pixel_ptr++] = encoded[2];
482
for (row = height - 1; row >= 0; row--) {
483
pixel_ptr = row * c->pic.linesize[0];
484
for (col = 0; col < width/4; col++) {
485
outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
486
outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
487
outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
488
outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
489
outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
490
outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
491
outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
492
outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
493
outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
494
outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
495
outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
496
outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
502
for (row = height - 1; row >= 0; row--) {
503
pixel_ptr = row * c->pic.linesize[0];
504
for (col = 0; col < width/2; col++) {
505
outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
506
outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
507
outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
508
outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
509
outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
510
outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
516
for (row = height / 2 - 1; row >= 0; row--) {
517
pixel_ptr = 2 * row * c->pic.linesize[0];
518
for (col = 0; col < width/2; col++) {
519
outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
520
outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
521
outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
522
outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
523
outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
524
outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
525
outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
526
outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
527
outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
528
outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
529
outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
530
outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
537
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
541
*data_size = sizeof(AVFrame);
542
*(AVFrame*)data = c->pic;
544
/* always report that the buffer was completely consumed */
555
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
556
LclContext *c = avctx->priv_data;
557
AVFrame *pict = data;
558
AVFrame * const p = &c->pic;
560
int zret; // Zlib return code
563
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
567
init_put_bits(&c->pb, buf, buf_size);
570
p->pict_type= FF_I_TYPE;
573
if(avctx->pix_fmt != PIX_FMT_BGR24){
574
av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
578
zret = deflateReset(&(c->zstream));
580
av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
583
c->zstream.next_out = c->comp_buf;
584
c->zstream.avail_out = c->max_comp_size;
586
for(i = avctx->height - 1; i >= 0; i--) {
587
c->zstream.next_in = p->data[0]+p->linesize[0]*i;
588
c->zstream.avail_in = avctx->width*3;
589
zret = deflate(&(c->zstream), Z_NO_FLUSH);
591
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
595
zret = deflate(&(c->zstream), Z_FINISH);
596
if (zret != Z_STREAM_END) {
597
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
601
for (i = 0; i < c->zstream.total_out; i++)
602
put_bits(&c->pb, 8, c->comp_buf[i]);
603
flush_put_bits(&c->pb);
605
return c->zstream.total_out;
616
static int decode_init(AVCodecContext *avctx)
618
LclContext * const c = (LclContext *)avctx->priv_data;
619
unsigned int basesize = avctx->width * avctx->height;
620
unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
621
unsigned int max_decomp_size;
622
int zret; // Zlib return code
625
avctx->has_b_frames = 0;
627
c->pic.data[0] = NULL;
630
// Needed if zlib unused or init aborted before inflateInit
631
memset(&(c->zstream), 0, sizeof(z_stream));
634
if (avctx->extradata_size < 8) {
635
av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
639
if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
643
/* Check codec type */
644
if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
645
((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
646
av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
649
/* Detect image type */
650
switch (c->imgtype = *((char *)avctx->extradata + 4)) {
652
c->decomp_size = basesize * 3;
653
max_decomp_size = max_basesize * 3;
654
av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
657
c->decomp_size = basesize * 2;
658
max_decomp_size = max_basesize * 2;
659
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
662
c->decomp_size = basesize * 3;
663
max_decomp_size = max_basesize * 3;
664
av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
667
c->decomp_size = basesize / 2 * 3;
668
max_decomp_size = max_basesize / 2 * 3;
669
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
672
c->decomp_size = basesize * 2;
673
max_decomp_size = max_basesize * 2;
674
av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
677
c->decomp_size = basesize / 2 * 3;
678
max_decomp_size = max_basesize / 2 * 3;
679
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
682
av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
686
/* Detect compression method */
687
c->compression = *((char *)avctx->extradata + 5);
688
switch (avctx->codec_id) {
690
switch (c->compression) {
692
av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
694
case COMP_MSZH_NOCOMP:
696
av_log(avctx, AV_LOG_INFO, "No compression.\n");
699
av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
705
switch (c->compression) {
706
case COMP_ZLIB_HISPEED:
707
av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
709
case COMP_ZLIB_HICOMP:
710
av_log(avctx, AV_LOG_INFO, "High compression.\n");
712
case COMP_ZLIB_NORMAL:
713
av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
716
if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
717
av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
720
av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
723
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
728
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
732
/* Allocate decompression buffer */
733
if (c->decomp_size) {
734
if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
735
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
741
c->flags = *((char *)avctx->extradata + 6);
742
if (c->flags & FLAG_MULTITHREAD)
743
av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
744
if (c->flags & FLAG_NULLFRAME)
745
av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
746
if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
747
av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
748
if (c->flags & FLAGMASK_UNUSED)
749
av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
751
/* If needed init zlib */
752
if (avctx->codec_id == CODEC_ID_ZLIB) {
754
c->zstream.zalloc = Z_NULL;
755
c->zstream.zfree = Z_NULL;
756
c->zstream.opaque = Z_NULL;
757
zret = inflateInit(&(c->zstream));
759
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
763
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
768
avctx->pix_fmt = PIX_FMT_BGR24;
780
static int encode_init(AVCodecContext *avctx)
782
LclContext *c = avctx->priv_data;
783
int zret; // Zlib return code
786
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
792
assert(avctx->width && avctx->height);
794
avctx->extradata= av_mallocz(8);
795
avctx->coded_frame= &c->pic;
797
// Will be user settable someday
801
switch(avctx->pix_fmt){
803
c->imgtype = IMGTYPE_RGB24;
804
c->decomp_size = avctx->width * avctx->height * 3;
805
avctx->bits_per_sample= 24;
808
av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
812
((uint8_t*)avctx->extradata)[0]= 4;
813
((uint8_t*)avctx->extradata)[1]= 0;
814
((uint8_t*)avctx->extradata)[2]= 0;
815
((uint8_t*)avctx->extradata)[3]= 0;
816
((uint8_t*)avctx->extradata)[4]= c->imgtype;
817
((uint8_t*)avctx->extradata)[5]= c->compression;
818
((uint8_t*)avctx->extradata)[6]= c->flags;
819
((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
820
c->avctx->extradata_size= 8;
822
c->zstream.zalloc = Z_NULL;
823
c->zstream.zfree = Z_NULL;
824
c->zstream.opaque = Z_NULL;
825
zret = deflateInit(&(c->zstream), c->compression);
827
av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
831
/* Conservative upper bound taken from zlib v1.2.1 source */
832
c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
833
((c->decomp_size + 63) >> 6) + 11;
834
if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
835
av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
852
static int decode_end(AVCodecContext *avctx)
854
LclContext * const c = (LclContext *)avctx->priv_data;
857
avctx->release_buffer(avctx, &c->pic);
859
inflateEnd(&(c->zstream));
872
static int encode_end(AVCodecContext *avctx)
874
LclContext *c = avctx->priv_data;
876
av_freep(&avctx->extradata);
877
av_freep(&c->comp_buf);
879
deflateEnd(&(c->zstream));
885
AVCodec mszh_decoder = {
898
AVCodec zlib_decoder = {
910
#ifdef CONFIG_ENCODERS
912
AVCodec zlib_encoder = {
922
#endif //CONFIG_ENCODERS