/* * LCL (LossLess Codec Library) Codec * Copyright (c) 2002-2004 Roberto Togni * * 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 * */ /** * @file lcl.c * LCL (LossLess Codec Library) Video Codec * Decoder for MSZH and ZLIB codecs * Experimental encoder for ZLIB RGB24 * * Fourcc: MSZH, ZLIB * * Original Win32 dll: * Ver2.23 By Kenji Oshima 2000.09.20 * avimszh.dll, avizlib.dll * * A description of the decoding algorithm can be found here: * http://www.pcisys.net/~melanson/codecs * * Supports: BGR24 (RGB 24bpp) * */ #include <stdio.h> #include <stdlib.h> #include "common.h" #include "bitstream.h" #include "avcodec.h" #ifdef CONFIG_ZLIB #include <zlib.h> #endif #define BMPTYPE_YUV 1 #define BMPTYPE_RGB 2 #define IMGTYPE_YUV111 0 #define IMGTYPE_YUV422 1 #define IMGTYPE_RGB24 2 #define IMGTYPE_YUV411 3 #define IMGTYPE_YUV211 4 #define IMGTYPE_YUV420 5 #define COMP_MSZH 0 #define COMP_MSZH_NOCOMP 1 #define COMP_ZLIB_HISPEED 1 #define COMP_ZLIB_HICOMP 9 #define COMP_ZLIB_NORMAL -1 #define FLAG_MULTITHREAD 1 #define FLAG_NULLFRAME 2 #define FLAG_PNGFILTER 4 #define FLAGMASK_UNUSED 0xf8 #define CODEC_MSZH 1 #define CODEC_ZLIB 3 #define FOURCC_MSZH mmioFOURCC('M','S','Z','H') #define FOURCC_ZLIB mmioFOURCC('Z','L','I','B') /* * Decoder context */ typedef struct LclContext { AVCodecContext *avctx; AVFrame pic; PutBitContext pb; // Image type int imgtype; // Compression type int compression; // Flags int flags; // Decompressed data size unsigned int decomp_size; // Decompression buffer unsigned char* decomp_buf; // Maximum compressed data size unsigned int max_comp_size; // Compression buffer unsigned char* comp_buf; #ifdef CONFIG_ZLIB z_stream zstream; #endif } LclContext; /* * * Helper functions * */ static inline unsigned char fix (int pix14) { int tmp; tmp = (pix14 + 0x80000) >> 20; if (tmp < 0) return 0; if (tmp > 255) return 255; return tmp; } static inline unsigned char get_b (unsigned char yq, signed char bq) { return fix((yq << 20) + bq * 1858076); } static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq) { return fix((yq << 20) - bq * 360857 - rq * 748830); } static inline unsigned char get_r (unsigned char yq, signed char rq) { return fix((yq << 20) + rq * 1470103); } static unsigned int mszh_decomp(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; 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; *(int*)destptr = *(int*)srcptr; srclen -= 4; destptr += 4; srcptr += 4; } else { ofs = *(srcptr++); cnt = *(srcptr++); ofs += cnt * 256;; cnt = ((cnt >> 3) & 0x1f) + 1; ofs &= 0x7ff; srclen -= 2; cnt *= 4; if (destptr + cnt > destptr_end) { cnt = destptr_end - destptr; } for (; cnt > 0; cnt--) { *(destptr) = *(destptr - ofs); destptr++; } } } return (destptr - destptr_bak); } #ifdef CONFIG_DECODERS /* * * Decode a frame * */ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { LclContext * const c = (LclContext *)avctx->priv_data; unsigned char *encoded = (unsigned char *)buf; unsigned int pixel_ptr; int row, col; unsigned char *outptr; unsigned int width = avctx->width; // Real image width unsigned int height = avctx->height; // Real image height unsigned int mszh_dlen; unsigned char yq, y1q, uq, vq; int uqvq; unsigned int mthread_inlen, mthread_outlen; #ifdef CONFIG_ZLIB int zret; // Zlib return code #endif unsigned int len = buf_size; if(c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 0; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; if(avctx->get_buffer(avctx, &c->pic) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } outptr = c->pic.data[0]; // Output image pointer /* Decompress frame */ switch (avctx->codec_id) { case CODEC_ID_MSZH: 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; 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, 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", mthread_outlen, mszh_dlen); return -1; } encoded = c->decomp_buf; len = c->decomp_size; } else { mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size); if (c->decomp_size != mszh_dlen) { av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n", c->decomp_size, mszh_dlen); return -1; } encoded = c->decomp_buf; len = mszh_dlen; } break; case COMP_MSZH_NOCOMP: break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n"); return -1; } break; case CODEC_ID_ZLIB: #ifdef CONFIG_ZLIB /* Using the original dll with normal compression (-1) and RGB format * gives a file with ZLIB fourcc, but frame is really uncompressed. * To be sure that's true check also frame size */ 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; } } 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; } } encoded = c->decomp_buf; len = c->decomp_size;; #else av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n"); return -1; #endif break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n"); return -1; } /* Apply PNG filter */ if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) { switch (c->imgtype) { case IMGTYPE_YUV111: case IMGTYPE_RGB24: for (row = 0; row < height; row++) { pixel_ptr = row * width * 3; yq = encoded[pixel_ptr++]; uqvq = encoded[pixel_ptr++]; uqvq+=(encoded[pixel_ptr++] << 8); for (col = 1; col < width; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8)); encoded[pixel_ptr+1] = (uqvq) & 0xff; encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff; pixel_ptr += 3; } } break; case IMGTYPE_YUV422: for (row = 0; row < height; row++) { pixel_ptr = row * width * 2; yq = uq = vq =0; for (col = 0; col < width/4; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5]; encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6]; encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7]; pixel_ptr += 8; } } break; case IMGTYPE_YUV411: for (row = 0; row < height; row++) { pixel_ptr = row * width / 2 * 3; yq = uq = vq =0; for (col = 0; col < width/4; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; pixel_ptr += 6; } } break; case IMGTYPE_YUV211: for (row = 0; row < height; row++) { pixel_ptr = row * width * 2; yq = uq = vq =0; for (col = 0; col < width/2; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3]; pixel_ptr += 4; } } break; case IMGTYPE_YUV420: for (row = 0; row < height/2; row++) { pixel_ptr = row * width * 3; yq = y1q = uq = vq =0; for (col = 0; col < width/2; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; pixel_ptr += 6; } } break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n"); return -1; } } /* Convert colorspace */ switch (c->imgtype) { case IMGTYPE_YUV111: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; for (col = 0; col < width; col++) { outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]); outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]); outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]); encoded += 3; } } break; case IMGTYPE_YUV422: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; for (col = 0; col < width/4; col++) { outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]); outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]); outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]); outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]); outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]); outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]); outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]); outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]); outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]); outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]); encoded += 8; } } break; case IMGTYPE_RGB24: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; for (col = 0; col < width; col++) { outptr[pixel_ptr++] = encoded[0]; outptr[pixel_ptr++] = encoded[1]; outptr[pixel_ptr++] = encoded[2]; encoded += 3; } } break; case IMGTYPE_YUV411: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; for (col = 0; col < width/4; col++) { outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]); outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]); outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]); outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]); outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]); outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]); outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]); outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]); outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]); encoded += 6; } } break; case IMGTYPE_YUV211: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; for (col = 0; col < width/2; col++) { outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]); outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]); outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]); outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]); outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]); outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]); encoded += 4; } } break; case IMGTYPE_YUV420: for (row = height / 2 - 1; row >= 0; row--) { pixel_ptr = 2 * row * c->pic.linesize[0]; for (col = 0; col < width/2; col++) { outptr[pixel_ptr] = get_b(encoded[0], encoded[4]); outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]); outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]); outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]); outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]); outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]); outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]); outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]); outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]); outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]); outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]); outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]); pixel_ptr += 6; encoded += 6; } } break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n"); return -1; } *data_size = sizeof(AVFrame); *(AVFrame*)data = c->pic; /* always report that the buffer was completely consumed */ return buf_size; } #endif #ifdef CONFIG_ENCODERS /* * * Encode a frame * */ static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ LclContext *c = avctx->priv_data; AVFrame *pict = data; AVFrame * const p = &c->pic; int i; int zret; // Zlib return code #ifndef CONFIG_ZLIB av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n"); return -1; #else init_put_bits(&c->pb, buf, buf_size); *p = *pict; p->pict_type= FF_I_TYPE; p->key_frame= 1; if(avctx->pix_fmt != PIX_FMT_BGR24){ av_log(avctx, AV_LOG_ERROR, "Format not supported!\n"); return -1; } zret = deflateReset(&(c->zstream)); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret); return -1; } c->zstream.next_out = c->comp_buf; c->zstream.avail_out = c->max_comp_size; for(i = avctx->height - 1; i >= 0; i--) { c->zstream.next_in = p->data[0]+p->linesize[0]*i; c->zstream.avail_in = avctx->width*3; zret = deflate(&(c->zstream), Z_NO_FLUSH); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); return -1; } } zret = deflate(&(c->zstream), Z_FINISH); if (zret != Z_STREAM_END) { av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); return -1; } for (i = 0; i < c->zstream.total_out; i++) put_bits(&c->pb, 8, c->comp_buf[i]); flush_put_bits(&c->pb); return c->zstream.total_out; #endif } #endif /* CONFIG_ENCODERS */ #ifdef CONFIG_DECODERS /* * * Init lcl decoder * */ static int decode_init(AVCodecContext *avctx) { LclContext * const c = (LclContext *)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_decomp_size; int zret; // Zlib return code c->avctx = avctx; avctx->has_b_frames = 0; c->pic.data[0] = NULL; #ifdef CONFIG_ZLIB // 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) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) || ((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) { av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n"); } /* Detect image type */ switch (c->imgtype = *((char *)avctx->extradata + 4)) { case IMGTYPE_YUV111: c->decomp_size = basesize * 3; max_decomp_size = max_basesize * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n"); break; case IMGTYPE_YUV422: c->decomp_size = basesize * 2; max_decomp_size = max_basesize * 2; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n"); break; case IMGTYPE_RGB24: c->decomp_size = basesize * 3; max_decomp_size = max_basesize * 3; av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n"); break; case IMGTYPE_YUV411: c->decomp_size = basesize / 2 * 3; max_decomp_size = max_basesize / 2 * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n"); break; case IMGTYPE_YUV211: c->decomp_size = basesize * 2; max_decomp_size = max_basesize * 2; av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n"); break; case IMGTYPE_YUV420: c->decomp_size = basesize / 2 * 3; max_decomp_size = max_basesize / 2 * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n"); break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype); return 1; } /* Detect compression method */ c->compression = *((char *)avctx->extradata + 5); switch (avctx->codec_id) { case CODEC_ID_MSZH: switch (c->compression) { case COMP_MSZH: av_log(avctx, AV_LOG_INFO, "Compression enabled.\n"); break; case COMP_MSZH_NOCOMP: c->decomp_size = 0; av_log(avctx, AV_LOG_INFO, "No compression.\n"); break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression); return 1; } break; case CODEC_ID_ZLIB: #ifdef CONFIG_ZLIB switch (c->compression) { case COMP_ZLIB_HISPEED: av_log(avctx, AV_LOG_INFO, "High speed compression.\n"); break; case COMP_ZLIB_HICOMP: av_log(avctx, AV_LOG_INFO, "High compression.\n"); break; case COMP_ZLIB_NORMAL: av_log(avctx, AV_LOG_INFO, "Normal compression.\n"); break; default: if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) { av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression); return 1; } av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression); } #else av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); return 1; #endif break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n"); return 1; } /* Allocate decompression buffer */ if (c->decomp_size) { if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return 1; } } /* Detect flags */ c->flags = *((char *)avctx->extradata + 6); if (c->flags & FLAG_MULTITHREAD) av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n"); if (c->flags & FLAG_NULLFRAME) av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n"); if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n"); if (c->flags & FLAGMASK_UNUSED) av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags); /* If needed init zlib */ if (avctx->codec_id == CODEC_ID_ZLIB) { #ifdef CONFIG_ZLIB c->zstream.zalloc = Z_NULL; c->zstream.zfree = Z_NULL; c->zstream.opaque = Z_NULL; zret = inflateInit(&(c->zstream)); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); return 1; } #else av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); return 1; #endif } avctx->pix_fmt = PIX_FMT_BGR24; return 0; } #endif /* CONFIG_DECODERS */ #ifdef CONFIG_ENCODERS /* * * Init lcl encoder * */ static int encode_init(AVCodecContext *avctx) { LclContext *c = avctx->priv_data; int zret; // Zlib return code #ifndef CONFIG_ZLIB av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); return 1; #else c->avctx= avctx; assert(avctx->width && avctx->height); avctx->extradata= av_mallocz(8); avctx->coded_frame= &c->pic; // Will be user settable someday c->compression = 6; c->flags = 0; switch(avctx->pix_fmt){ case PIX_FMT_BGR24: c->imgtype = IMGTYPE_RGB24; c->decomp_size = avctx->width * avctx->height * 3; avctx->bits_per_sample= 24; break; default: av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt); return -1; } ((uint8_t*)avctx->extradata)[0]= 4; ((uint8_t*)avctx->extradata)[1]= 0; ((uint8_t*)avctx->extradata)[2]= 0; ((uint8_t*)avctx->extradata)[3]= 0; ((uint8_t*)avctx->extradata)[4]= c->imgtype; ((uint8_t*)avctx->extradata)[5]= c->compression; ((uint8_t*)avctx->extradata)[6]= c->flags; ((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB; c->avctx->extradata_size= 8; c->zstream.zalloc = Z_NULL; c->zstream.zfree = Z_NULL; c->zstream.opaque = Z_NULL; zret = deflateInit(&(c->zstream), c->compression); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret); return 1; } /* Conservative upper bound taken from zlib v1.2.1 source */ c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) + ((c->decomp_size + 63) >> 6) + 11; if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) { av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n"); return 1; } return 0; #endif } #endif /* CONFIG_ENCODERS */ #ifdef CONFIG_DECODERS /* * * Uninit lcl decoder * */ static int decode_end(AVCodecContext *avctx) { LclContext * const c = (LclContext *)avctx->priv_data; if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); #ifdef CONFIG_ZLIB inflateEnd(&(c->zstream)); #endif return 0; } #endif #ifdef CONFIG_ENCODERS /* * * Uninit lcl encoder * */ static int encode_end(AVCodecContext *avctx) { LclContext *c = avctx->priv_data; av_freep(&avctx->extradata); av_freep(&c->comp_buf); #ifdef CONFIG_ZLIB deflateEnd(&(c->zstream)); #endif return 0; } #endif #ifdef CONFIG_MSZH_DECODER AVCodec mszh_decoder = { "mszh", CODEC_TYPE_VIDEO, CODEC_ID_MSZH, sizeof(LclContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, }; #endif #ifdef CONFIG_ZLIB_DECODER AVCodec zlib_decoder = { "zlib", CODEC_TYPE_VIDEO, CODEC_ID_ZLIB, sizeof(LclContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, }; #endif #ifdef CONFIG_ENCODERS AVCodec zlib_encoder = { "zlib", CODEC_TYPE_VIDEO, CODEC_ID_ZLIB, sizeof(LclContext), encode_init, encode_frame, encode_end, }; #endif //CONFIG_ENCODERS