yading@10: /*
yading@10:  * LCL (LossLess Codec Library) Codec
yading@10:  * Copyright (c) 2002-2004 Roberto Togni
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * LCL (LossLess Codec Library) Video Codec
yading@10:  * Decoder for MSZH and ZLIB codecs
yading@10:  * Experimental encoder for ZLIB RGB24
yading@10:  *
yading@10:  * Fourcc: MSZH, ZLIB
yading@10:  *
yading@10:  * Original Win32 dll:
yading@10:  * Ver2.23 By Kenji Oshima 2000.09.20
yading@10:  * avimszh.dll, avizlib.dll
yading@10:  *
yading@10:  * A description of the decoding algorithm can be found here:
yading@10:  *   http://www.pcisys.net/~melanson/codecs
yading@10:  *
yading@10:  * Supports: BGR24 (RGB 24bpp)
yading@10:  *
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <stdlib.h>
yading@10: 
yading@10: #include "libavutil/mem.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "lcl.h"
yading@10: 
yading@10: #if CONFIG_ZLIB_DECODER
yading@10: #include <zlib.h>
yading@10: #endif
yading@10: 
yading@10: /*
yading@10:  * Decoder context
yading@10:  */
yading@10: typedef struct LclDecContext {
yading@10:     // Image type
yading@10:     int imgtype;
yading@10:     // Compression type
yading@10:     int compression;
yading@10:     // Flags
yading@10:     int flags;
yading@10:     // Decompressed data size
yading@10:     unsigned int decomp_size;
yading@10:     // Decompression buffer
yading@10:     unsigned char* decomp_buf;
yading@10: #if CONFIG_ZLIB_DECODER
yading@10:     z_stream zstream;
yading@10: #endif
yading@10: } LclDecContext;
yading@10: 
yading@10: 
yading@10: /**
yading@10:  * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
yading@10:  * @param destptr must be padded sufficiently for av_memcpy_backptr
yading@10:  */
yading@10: static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
yading@10: {
yading@10:     unsigned char *destptr_bak = destptr;
yading@10:     unsigned char *destptr_end = destptr + destsize;
yading@10:     const unsigned char *srcptr_end = srcptr + srclen;
yading@10:     unsigned mask = *srcptr++;
yading@10:     unsigned maskbit = 0x80;
yading@10: 
yading@10:     while (srcptr < srcptr_end && destptr < destptr_end) {
yading@10:         if (!(mask & maskbit)) {
yading@10:             memcpy(destptr, srcptr, 4);
yading@10:             destptr += 4;
yading@10:             srcptr += 4;
yading@10:         } else {
yading@10:             unsigned ofs = bytestream_get_le16(&srcptr);
yading@10:             unsigned cnt = (ofs >> 11) + 1;
yading@10:             ofs &= 0x7ff;
yading@10:             ofs = FFMIN(ofs, destptr - destptr_bak);
yading@10:             cnt *= 4;
yading@10:             cnt = FFMIN(cnt, destptr_end - destptr);
yading@10:             if (ofs) {
yading@10:                 av_memcpy_backptr(destptr, ofs, cnt);
yading@10:             } else {
yading@10:                 // Not known what the correct behaviour is, but
yading@10:                 // this at least avoids uninitialized data.
yading@10:                 memset(destptr, 0, cnt);
yading@10:             }
yading@10:             destptr += cnt;
yading@10:         }
yading@10:         maskbit >>= 1;
yading@10:         if (!maskbit) {
yading@10:             mask = *srcptr++;
yading@10:             while (!mask) {
yading@10:                 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
yading@10:                 memcpy(destptr, srcptr, 32);
yading@10:                 destptr += 32;
yading@10:                 srcptr += 32;
yading@10:                 mask = *srcptr++;
yading@10:             }
yading@10:             maskbit = 0x80;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return destptr - destptr_bak;
yading@10: }
yading@10: 
yading@10: 
yading@10: #if CONFIG_ZLIB_DECODER
yading@10: /**
yading@10:  * @brief decompress a zlib-compressed data block into decomp_buf
yading@10:  * @param src compressed input buffer
yading@10:  * @param src_len data length in input buffer
yading@10:  * @param offset offset in decomp_buf
yading@10:  * @param expected expected decompressed length
yading@10:  */
yading@10: static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
yading@10: {
yading@10:     LclDecContext *c = avctx->priv_data;
yading@10:     int zret = inflateReset(&c->zstream);
yading@10:     if (zret != Z_OK) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
yading@10:         return AVERROR_UNKNOWN;
yading@10:     }
yading@10:     c->zstream.next_in = (uint8_t *)src;
yading@10:     c->zstream.avail_in = src_len;
yading@10:     c->zstream.next_out = c->decomp_buf + offset;
yading@10:     c->zstream.avail_out = c->decomp_size - offset;
yading@10:     zret = inflate(&c->zstream, Z_FINISH);
yading@10:     if (zret != Z_OK && zret != Z_STREAM_END) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
yading@10:         return AVERROR_UNKNOWN;
yading@10:     }
yading@10:     if (expected != (unsigned int)c->zstream.total_out) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
yading@10:                expected, c->zstream.total_out);
yading@10:         return AVERROR_UNKNOWN;
yading@10:     }
yading@10:     return c->zstream.total_out;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Decode a frame
yading@10:  *
yading@10:  */
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     AVFrame *frame = data;
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     LclDecContext * const c = avctx->priv_data;
yading@10:     unsigned char *encoded = (unsigned char *)buf;
yading@10:     unsigned int pixel_ptr;
yading@10:     int row, col;
yading@10:     unsigned char *outptr;
yading@10:     uint8_t *y_out, *u_out, *v_out;
yading@10:     unsigned int width = avctx->width; // Real image width
yading@10:     unsigned int height = avctx->height; // Real image height
yading@10:     unsigned int mszh_dlen;
yading@10:     unsigned char yq, y1q, uq, vq;
yading@10:     int uqvq, ret;
yading@10:     unsigned int mthread_inlen, mthread_outlen;
yading@10:     unsigned int len = buf_size;
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     outptr = frame->data[0]; // Output image pointer
yading@10: 
yading@10:     /* Decompress frame */
yading@10:     switch (avctx->codec_id) {
yading@10:     case AV_CODEC_ID_MSZH:
yading@10:         switch (c->compression) {
yading@10:         case COMP_MSZH:
yading@10:             if (c->imgtype == IMGTYPE_RGB24 && len == width * height * 3) {
yading@10:                 ;
yading@10:             } else if (c->flags & FLAG_MULTITHREAD) {
yading@10:                 mthread_inlen = AV_RL32(encoded);
yading@10:                 if (len < 8) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 mthread_inlen = FFMIN(mthread_inlen, len - 8);
yading@10:                 mthread_outlen = AV_RL32(encoded+4);
yading@10:                 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
yading@10:                 mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
yading@10:                 if (mthread_outlen != mszh_dlen) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
yading@10:                            mthread_outlen, mszh_dlen);
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
yading@10:                                         c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
yading@10:                 if (mthread_outlen != mszh_dlen) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
yading@10:                            mthread_outlen, mszh_dlen);
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 encoded = c->decomp_buf;
yading@10:                 len = c->decomp_size;
yading@10:             } else {
yading@10:                 mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
yading@10:                 if (c->decomp_size != mszh_dlen) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
yading@10:                            c->decomp_size, mszh_dlen);
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 encoded = c->decomp_buf;
yading@10:                 len = mszh_dlen;
yading@10:             }
yading@10:             break;
yading@10:         case COMP_MSZH_NOCOMP: {
yading@10:             int bppx2;
yading@10:             switch (c->imgtype) {
yading@10:             case IMGTYPE_YUV111:
yading@10:             case IMGTYPE_RGB24:
yading@10:                 bppx2 = 6;
yading@10:                 break;
yading@10:             case IMGTYPE_YUV422:
yading@10:             case IMGTYPE_YUV211:
yading@10:                 bppx2 = 4;
yading@10:                 break;
yading@10:             case IMGTYPE_YUV411:
yading@10:             case IMGTYPE_YUV420:
yading@10:                 bppx2 = 3;
yading@10:                 break;
yading@10:             default:
yading@10:                 bppx2 = 0; // will error out below
yading@10:                 break;
yading@10:             }
yading@10:             if (len < ((width * height * bppx2) >> 1))
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             break;
yading@10:         }
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         break;
yading@10: #if CONFIG_ZLIB_DECODER
yading@10:     case AV_CODEC_ID_ZLIB:
yading@10:         /* Using the original dll with normal compression (-1) and RGB format
yading@10:          * gives a file with ZLIB fourcc, but frame is really uncompressed.
yading@10:          * To be sure that's true check also frame size */
yading@10:         if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
yading@10:             len == width * height * 3) {
yading@10:             if (c->flags & FLAG_PNGFILTER) {
yading@10:                 memcpy(c->decomp_buf, encoded, len);
yading@10:                 encoded = c->decomp_buf;
yading@10:             } else {
yading@10:                 break;
yading@10:             }
yading@10:         } else if (c->flags & FLAG_MULTITHREAD) {
yading@10:             mthread_inlen = AV_RL32(encoded);
yading@10:             mthread_inlen = FFMIN(mthread_inlen, len - 8);
yading@10:             mthread_outlen = AV_RL32(encoded+4);
yading@10:             mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
yading@10:             ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
yading@10:             if (ret < 0) return ret;
yading@10:             ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
yading@10:                               mthread_outlen, mthread_outlen);
yading@10:             if (ret < 0) return ret;
yading@10:         } else {
yading@10:             int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
yading@10:             if (ret < 0) return ret;
yading@10:         }
yading@10:         encoded = c->decomp_buf;
yading@10:         len = c->decomp_size;
yading@10:         break;
yading@10: #endif
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10: 
yading@10:     /* Apply PNG filter */
yading@10:     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
yading@10:         switch (c->imgtype) {
yading@10:         case IMGTYPE_YUV111:
yading@10:         case IMGTYPE_RGB24:
yading@10:             for (row = 0; row < height; row++) {
yading@10:                 pixel_ptr = row * width * 3;
yading@10:                 yq = encoded[pixel_ptr++];
yading@10:                 uqvq = AV_RL16(encoded+pixel_ptr);
yading@10:                 pixel_ptr += 2;
yading@10:                 for (col = 1; col < width; col++) {
yading@10:                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
yading@10:                     uqvq -= AV_RL16(encoded+pixel_ptr+1);
yading@10:                     AV_WL16(encoded+pixel_ptr+1, uqvq);
yading@10:                     pixel_ptr += 3;
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10:         case IMGTYPE_YUV422:
yading@10:             for (row = 0; row < height; row++) {
yading@10:                 pixel_ptr = row * width * 2;
yading@10:                 yq = uq = vq =0;
yading@10:                 for (col = 0; col < width/4; col++) {
yading@10:                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
yading@10:                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
yading@10:                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
yading@10:                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
yading@10:                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
yading@10:                     encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
yading@10:                     encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
yading@10:                     encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
yading@10:                     pixel_ptr += 8;
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10:         case IMGTYPE_YUV411:
yading@10:             for (row = 0; row < height; row++) {
yading@10:                 pixel_ptr = row * width / 2 * 3;
yading@10:                 yq = uq = vq =0;
yading@10:                 for (col = 0; col < width/4; col++) {
yading@10:                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
yading@10:                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
yading@10:                     encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
yading@10:                     encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
yading@10:                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
yading@10:                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
yading@10:                     pixel_ptr += 6;
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10:         case IMGTYPE_YUV211:
yading@10:             for (row = 0; row < height; row++) {
yading@10:                 pixel_ptr = row * width * 2;
yading@10:                 yq = uq = vq =0;
yading@10:                 for (col = 0; col < width/2; col++) {
yading@10:                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
yading@10:                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
yading@10:                     encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
yading@10:                     encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
yading@10:                     pixel_ptr += 4;
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10:         case IMGTYPE_YUV420:
yading@10:             for (row = 0; row < height/2; row++) {
yading@10:                 pixel_ptr = row * width * 3;
yading@10:                 yq = y1q = uq = vq =0;
yading@10:                 for (col = 0; col < width/2; col++) {
yading@10:                     encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
yading@10:                     encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
yading@10:                     encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
yading@10:                     encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
yading@10:                     encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
yading@10:                     encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
yading@10:                     pixel_ptr += 6;
yading@10:                 }
yading@10:             }
yading@10:             break;
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* Convert colorspace */
yading@10:     y_out = frame->data[0] + (height - 1) * frame->linesize[0];
yading@10:     u_out = frame->data[1] + (height - 1) * frame->linesize[1];
yading@10:     v_out = frame->data[2] + (height - 1) * frame->linesize[2];
yading@10:     switch (c->imgtype) {
yading@10:     case IMGTYPE_YUV111:
yading@10:         for (row = 0; row < height; row++) {
yading@10:             for (col = 0; col < width; col++) {
yading@10:                 y_out[col] = *encoded++;
yading@10:                 u_out[col] = *encoded++ + 128;
yading@10:                 v_out[col] = *encoded++ + 128;
yading@10:             }
yading@10:             y_out -= frame->linesize[0];
yading@10:             u_out -= frame->linesize[1];
yading@10:             v_out -= frame->linesize[2];
yading@10:         }
yading@10:         break;
yading@10:     case IMGTYPE_YUV422:
yading@10:         for (row = 0; row < height; row++) {
yading@10:             for (col = 0; col < width - 3; col += 4) {
yading@10:                 memcpy(y_out + col, encoded, 4);
yading@10:                 encoded += 4;
yading@10:                 u_out[ col >> 1     ] = *encoded++ + 128;
yading@10:                 u_out[(col >> 1) + 1] = *encoded++ + 128;
yading@10:                 v_out[ col >> 1     ] = *encoded++ + 128;
yading@10:                 v_out[(col >> 1) + 1] = *encoded++ + 128;
yading@10:             }
yading@10:             y_out -= frame->linesize[0];
yading@10:             u_out -= frame->linesize[1];
yading@10:             v_out -= frame->linesize[2];
yading@10:         }
yading@10:         break;
yading@10:     case IMGTYPE_RGB24:
yading@10:         for (row = height - 1; row >= 0; row--) {
yading@10:             pixel_ptr = row * frame->linesize[0];
yading@10:             memcpy(outptr + pixel_ptr, encoded, 3 * width);
yading@10:             encoded += 3 * width;
yading@10:         }
yading@10:         break;
yading@10:     case IMGTYPE_YUV411:
yading@10:         for (row = 0; row < height; row++) {
yading@10:             for (col = 0; col < width - 3; col += 4) {
yading@10:                 memcpy(y_out + col, encoded, 4);
yading@10:                 encoded += 4;
yading@10:                 u_out[col >> 2] = *encoded++ + 128;
yading@10:                 v_out[col >> 2] = *encoded++ + 128;
yading@10:             }
yading@10:             y_out -= frame->linesize[0];
yading@10:             u_out -= frame->linesize[1];
yading@10:             v_out -= frame->linesize[2];
yading@10:         }
yading@10:         break;
yading@10:     case IMGTYPE_YUV211:
yading@10:         for (row = 0; row < height; row++) {
yading@10:             for (col = 0; col < width - 1; col += 2) {
yading@10:                 memcpy(y_out + col, encoded, 2);
yading@10:                 encoded += 2;
yading@10:                 u_out[col >> 1] = *encoded++ + 128;
yading@10:                 v_out[col >> 1] = *encoded++ + 128;
yading@10:             }
yading@10:             y_out -= frame->linesize[0];
yading@10:             u_out -= frame->linesize[1];
yading@10:             v_out -= frame->linesize[2];
yading@10:         }
yading@10:         break;
yading@10:     case IMGTYPE_YUV420:
yading@10:         u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
yading@10:         v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
yading@10:         for (row = 0; row < height - 1; row += 2) {
yading@10:             for (col = 0; col < width - 1; col += 2) {
yading@10:                 memcpy(y_out + col, encoded, 2);
yading@10:                 encoded += 2;
yading@10:                 memcpy(y_out + col - frame->linesize[0], encoded, 2);
yading@10:                 encoded += 2;
yading@10:                 u_out[col >> 1] = *encoded++ + 128;
yading@10:                 v_out[col >> 1] = *encoded++ + 128;
yading@10:             }
yading@10:             y_out -= frame->linesize[0] << 1;
yading@10:             u_out -= frame->linesize[1];
yading@10:             v_out -= frame->linesize[2];
yading@10:         }
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     /* always report that the buffer was completely consumed */
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Init lcl decoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     LclDecContext * const c = avctx->priv_data;
yading@10:     unsigned int basesize = avctx->width * avctx->height;
yading@10:     unsigned int max_basesize = FFALIGN(avctx->width,  4) *
yading@10:                                 FFALIGN(avctx->height, 4);
yading@10:     unsigned int max_decomp_size;
yading@10: 
yading@10:     if (avctx->extradata_size < 8) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     /* Check codec type */
yading@10:     if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
yading@10:         (avctx->codec_id == AV_CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
yading@10:     }
yading@10: 
yading@10:     /* Detect image type */
yading@10:     switch (c->imgtype = avctx->extradata[4]) {
yading@10:     case IMGTYPE_YUV111:
yading@10:         c->decomp_size = basesize * 3;
yading@10:         max_decomp_size = max_basesize * 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV444P;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
yading@10:         break;
yading@10:     case IMGTYPE_YUV422:
yading@10:         c->decomp_size = basesize * 2;
yading@10:         max_decomp_size = max_basesize * 2;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
yading@10:         break;
yading@10:     case IMGTYPE_RGB24:
yading@10:         c->decomp_size = basesize * 3;
yading@10:         max_decomp_size = max_basesize * 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_BGR24;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
yading@10:         break;
yading@10:     case IMGTYPE_YUV411:
yading@10:         c->decomp_size = basesize / 2 * 3;
yading@10:         max_decomp_size = max_basesize / 2 * 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
yading@10:         break;
yading@10:     case IMGTYPE_YUV211:
yading@10:         c->decomp_size = basesize * 2;
yading@10:         max_decomp_size = max_basesize * 2;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
yading@10:         break;
yading@10:     case IMGTYPE_YUV420:
yading@10:         c->decomp_size = basesize / 2 * 3;
yading@10:         max_decomp_size = max_basesize / 2 * 3;
yading@10:         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     /* Detect compression method */
yading@10:     c->compression = (int8_t)avctx->extradata[5];
yading@10:     switch (avctx->codec_id) {
yading@10:     case AV_CODEC_ID_MSZH:
yading@10:         switch (c->compression) {
yading@10:         case COMP_MSZH:
yading@10:             av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
yading@10:             break;
yading@10:         case COMP_MSZH_NOCOMP:
yading@10:             c->decomp_size = 0;
yading@10:             av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
yading@10:             break;
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         break;
yading@10: #if CONFIG_ZLIB_DECODER
yading@10:     case AV_CODEC_ID_ZLIB:
yading@10:         switch (c->compression) {
yading@10:         case COMP_ZLIB_HISPEED:
yading@10:             av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
yading@10:             break;
yading@10:         case COMP_ZLIB_HICOMP:
yading@10:             av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
yading@10:             break;
yading@10:         case COMP_ZLIB_NORMAL:
yading@10:             av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
yading@10:             break;
yading@10:         default:
yading@10:             if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
yading@10:         }
yading@10:         break;
yading@10: #endif
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     /* Allocate decompression buffer */
yading@10:     if (c->decomp_size) {
yading@10:         if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     /* Detect flags */
yading@10:     c->flags = avctx->extradata[6];
yading@10:     if (c->flags & FLAG_MULTITHREAD)
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
yading@10:     if (c->flags & FLAG_NULLFRAME)
yading@10:         av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
yading@10:     if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
yading@10:         av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
yading@10:     if (c->flags & FLAGMASK_UNUSED)
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
yading@10: 
yading@10:     /* If needed init zlib */
yading@10: #if CONFIG_ZLIB_DECODER
yading@10:     if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
yading@10:         int zret;
yading@10:         c->zstream.zalloc = Z_NULL;
yading@10:         c->zstream.zfree = Z_NULL;
yading@10:         c->zstream.opaque = Z_NULL;
yading@10:         zret = inflateInit(&c->zstream);
yading@10:         if (zret != Z_OK) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
yading@10:             av_freep(&c->decomp_buf);
yading@10:             return AVERROR_UNKNOWN;
yading@10:         }
yading@10:     }
yading@10: #endif
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /*
yading@10:  *
yading@10:  * Uninit lcl decoder
yading@10:  *
yading@10:  */
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     LclDecContext * const c = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&c->decomp_buf);
yading@10: #if CONFIG_ZLIB_DECODER
yading@10:     if (avctx->codec_id == AV_CODEC_ID_ZLIB)
yading@10:         inflateEnd(&c->zstream);
yading@10: #endif
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if CONFIG_MSZH_DECODER
yading@10: AVCodec ff_mszh_decoder = {
yading@10:     .name           = "mszh",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_MSZH,
yading@10:     .priv_data_size = sizeof(LclDecContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
yading@10: };
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_ZLIB_DECODER
yading@10: AVCodec ff_zlib_decoder = {
yading@10:     .name           = "zlib",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_ZLIB,
yading@10:     .priv_data_size = sizeof(LclDecContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
yading@10: };
yading@10: #endif