/* * TIFF image decoder * Copyright (c) 2006 Konstantin Shishkov * * 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 */ /** * TIFF image decoder * @file * @author Konstantin Shishkov */ #include "avcodec.h" #if CONFIG_ZLIB #include <zlib.h> #endif #include "lzw.h" #include "tiff.h" #include "faxcompr.h" #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "libavcore/imgutils.h" typedef struct TiffContext { AVCodecContext *avctx; AVFrame picture; int width, height; unsigned int bpp; int le; int compr; int invert; int fax_opts; int predictor; int fill_order; int strips, rps, sstype; int sot; const uint8_t* stripdata; const uint8_t* stripsizes; int stripsize, stripoff; LZWState *lzw; } TiffContext; static int tget_short(const uint8_t **p, int le){ int v = le ? AV_RL16(*p) : AV_RB16(*p); *p += 2; return v; } static int tget_long(const uint8_t **p, int le){ int v = le ? AV_RL32(*p) : AV_RB32(*p); *p += 4; return v; } static int tget(const uint8_t **p, int type, int le){ switch(type){ case TIFF_BYTE : return *(*p)++; case TIFF_SHORT: return tget_short(p, le); case TIFF_LONG : return tget_long (p, le); default : return -1; } } #if CONFIG_ZLIB static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src, int size) { z_stream zstream; int zret; memset(&zstream, 0, sizeof(zstream)); zstream.next_in = src; zstream.avail_in = size; zstream.next_out = dst; zstream.avail_out = *len; zret = inflateInit(&zstream); if (zret != Z_OK) { av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret); return zret; } zret = inflate(&zstream, Z_SYNC_FLUSH); inflateEnd(&zstream); *len = zstream.total_out; return zret == Z_STREAM_END ? Z_OK : zret; } #endif static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){ int c, line, pixels, code; const uint8_t *ssrc = src; int width = s->width * s->bpp >> 3; #if CONFIG_ZLIB uint8_t *zbuf; unsigned long outlen; if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){ int ret; outlen = width * lines; zbuf = av_malloc(outlen); ret = tiff_uncompress(zbuf, &outlen, src, size); if(ret != Z_OK){ av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu) with error %d\n", outlen, (unsigned long)width * lines, ret); av_free(zbuf); return -1; } src = zbuf; for(line = 0; line < lines; line++){ memcpy(dst, src, width); dst += stride; src += width; } av_free(zbuf); return 0; } #endif if(s->compr == TIFF_LZW){ if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){ av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n"); return -1; } } if(s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3 || s->compr == TIFF_G4){ int i, ret = 0; uint8_t *src2 = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE); if(!src2 || (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE < (unsigned)size){ av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n"); return -1; } if(s->fax_opts & 2){ av_log(s->avctx, AV_LOG_ERROR, "Uncompressed fax mode is not supported (yet)\n"); av_free(src2); return -1; } if(!s->fill_order){ memcpy(src2, src, size); }else{ for(i = 0; i < size; i++) src2[i] = av_reverse[src[i]]; } memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE); switch(s->compr){ case TIFF_CCITT_RLE: case TIFF_G3: case TIFF_G4: ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts); break; } av_free(src2); return ret; } for(line = 0; line < lines; line++){ if(src - ssrc > size){ av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n"); return -1; } switch(s->compr){ case TIFF_RAW: memcpy(dst, src, width); src += width; break; case TIFF_PACKBITS: for(pixels = 0; pixels < width;){ code = (int8_t)*src++; if(code >= 0){ code++; if(pixels + code > width){ av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n"); return -1; } memcpy(dst + pixels, src, code); src += code; pixels += code; }else if(code != -128){ // -127..-1 code = (-code) + 1; if(pixels + code > width){ av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n"); return -1; } c = *src++; memset(dst + pixels, c, code); pixels += code; } } break; case TIFF_LZW: pixels = ff_lzw_decode(s->lzw, dst, width); if(pixels < width){ av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width); return -1; } break; } dst += stride; } return 0; } static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf) { int tag, type, count, off, value = 0; int i, j; uint32_t *pal; const uint8_t *rp, *gp, *bp; tag = tget_short(&buf, s->le); type = tget_short(&buf, s->le); count = tget_long(&buf, s->le); off = tget_long(&buf, s->le); if(count == 1){ switch(type){ case TIFF_BYTE: case TIFF_SHORT: buf -= 4; value = tget(&buf, type, s->le); buf = NULL; break; case TIFF_LONG: value = off; buf = NULL; break; case TIFF_STRING: if(count <= 4){ buf -= 4; break; } default: value = -1; buf = start + off; } }else if(type_sizes[type] * count <= 4){ buf -= 4; }else{ buf = start + off; } if(buf && (buf < start || buf > end_buf)){ av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n"); return -1; } switch(tag){ case TIFF_WIDTH: s->width = value; break; case TIFF_HEIGHT: s->height = value; break; case TIFF_BPP: if(count == 1) s->bpp = value; else{ switch(type){ case TIFF_BYTE: s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF); break; case TIFF_SHORT: case TIFF_LONG: s->bpp = 0; for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le); break; default: s->bpp = -1; } } if(count > 4){ av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count); return -1; } switch(s->bpp*10 + count){ case 11: s->avctx->pix_fmt = PIX_FMT_MONOBLACK; break; case 81: s->avctx->pix_fmt = PIX_FMT_PAL8; break; case 243: s->avctx->pix_fmt = PIX_FMT_RGB24; break; case 161: s->avctx->pix_fmt = PIX_FMT_GRAY16BE; break; case 324: s->avctx->pix_fmt = PIX_FMT_RGBA; break; case 483: s->avctx->pix_fmt = s->le ? PIX_FMT_RGB48LE : PIX_FMT_RGB48BE; break; default: av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count); return -1; } if(s->width != s->avctx->width || s->height != s->avctx->height){ if(av_image_check_size(s->width, s->height, 0, s->avctx)) return -1; avcodec_set_dimensions(s->avctx, s->width, s->height); } if(s->picture.data[0]) s->avctx->release_buffer(s->avctx, &s->picture); if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){ av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } if(s->bpp == 8){ /* make default grayscale pal */ pal = (uint32_t *) s->picture.data[1]; for(i = 0; i < 256; i++) pal[i] = i * 0x010101; } break; case TIFF_COMPR: s->compr = value; s->predictor = 0; switch(s->compr){ case TIFF_RAW: case TIFF_PACKBITS: case TIFF_LZW: case TIFF_CCITT_RLE: break; case TIFF_G3: case TIFF_G4: s->fax_opts = 0; break; case TIFF_DEFLATE: case TIFF_ADOBE_DEFLATE: #if CONFIG_ZLIB break; #else av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n"); return -1; #endif case TIFF_JPEG: case TIFF_NEWJPEG: av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n"); return -1; default: av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr); return -1; } break; case TIFF_ROWSPERSTRIP: if(type == TIFF_LONG && value == -1) value = s->avctx->height; if(value < 1){ av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n"); return -1; } s->rps = value; break; case TIFF_STRIP_OFFS: if(count == 1){ s->stripdata = NULL; s->stripoff = value; }else s->stripdata = start + off; s->strips = count; if(s->strips == 1) s->rps = s->height; s->sot = type; if(s->stripdata > end_buf){ av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n"); return -1; } break; case TIFF_STRIP_SIZE: if(count == 1){ s->stripsizes = NULL; s->stripsize = value; s->strips = 1; }else{ s->stripsizes = start + off; } s->strips = count; s->sstype = type; if(s->stripsizes > end_buf){ av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n"); return -1; } break; case TIFF_PREDICTOR: s->predictor = value; break; case TIFF_INVERT: switch(value){ case 0: s->invert = 1; break; case 1: s->invert = 0; break; case 2: case 3: break; default: av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value); return -1; } break; case TIFF_FILL_ORDER: if(value < 1 || value > 2){ av_log(s->avctx, AV_LOG_ERROR, "Unknown FillOrder value %d, trying default one\n", value); value = 1; } s->fill_order = value - 1; break; case TIFF_PAL: if(s->avctx->pix_fmt != PIX_FMT_PAL8){ av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n"); return -1; } pal = (uint32_t *) s->picture.data[1]; off = type_sizes[type]; rp = buf; gp = buf + count / 3 * off; bp = buf + count / 3 * off * 2; off = (type_sizes[type] - 1) << 3; for(i = 0; i < count / 3; i++){ j = (tget(&rp, type, s->le) >> off) << 16; j |= (tget(&gp, type, s->le) >> off) << 8; j |= tget(&bp, type, s->le) >> off; pal[i] = j; } break; case TIFF_PLANAR: if(value == 2){ av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n"); return -1; } break; case TIFF_T4OPTIONS: if(s->compr == TIFF_G3) s->fax_opts = value; break; case TIFF_T6OPTIONS: if(s->compr == TIFF_G4) s->fax_opts = value; break; } return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; TiffContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p= (AVFrame*)&s->picture; const uint8_t *orig_buf = buf, *end_buf = buf + buf_size; int id, le, off; int i, j, entries; int stride, soff, ssize; uint8_t *dst; //parse image header id = AV_RL16(buf); buf += 2; if(id == 0x4949) le = 1; else if(id == 0x4D4D) le = 0; else{ av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n"); return -1; } s->le = le; s->invert = 0; s->compr = TIFF_RAW; s->fill_order = 0; // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number // that further identifies the file as a TIFF file" if(tget_short(&buf, le) != 42){ av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n"); return -1; } /* parse image file directory */ off = tget_long(&buf, le); if(orig_buf + off + 14 >= end_buf){ av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n"); return -1; } buf = orig_buf + off; entries = tget_short(&buf, le); for(i = 0; i < entries; i++){ if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0) return -1; buf += 12; } if(!s->stripdata && !s->stripoff){ av_log(avctx, AV_LOG_ERROR, "Image data is missing\n"); return -1; } /* now we have the data and may start decoding */ if(!p->data[0]){ s->bpp = 1; avctx->pix_fmt = PIX_FMT_MONOBLACK; if(s->width != s->avctx->width || s->height != s->avctx->height){ if(av_image_check_size(s->width, s->height, 0, s->avctx)) return -1; avcodec_set_dimensions(s->avctx, s->width, s->height); } if(s->picture.data[0]) s->avctx->release_buffer(s->avctx, &s->picture); if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){ av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } } if(s->strips == 1 && !s->stripsize){ av_log(avctx, AV_LOG_WARNING, "Image data size missing\n"); s->stripsize = buf_size - s->stripoff; } stride = p->linesize[0]; dst = p->data[0]; for(i = 0; i < s->height; i += s->rps){ if(s->stripsizes) ssize = tget(&s->stripsizes, s->sstype, s->le); else ssize = s->stripsize; if(s->stripdata){ soff = tget(&s->stripdata, s->sot, s->le); }else soff = s->stripoff; if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0) break; dst += s->rps * stride; } if(s->predictor == 2){ dst = p->data[0]; soff = s->bpp >> 3; ssize = s->width * soff; for(i = 0; i < s->height; i++) { for(j = soff; j < ssize; j++) dst[j] += dst[j - soff]; dst += stride; } } if(s->invert){ uint8_t *src; int j; src = s->picture.data[0]; for(j = 0; j < s->height; j++){ for(i = 0; i < s->picture.linesize[0]; i++) src[i] = 255 - src[i]; src += s->picture.linesize[0]; } } *picture= *(AVFrame*)&s->picture; *data_size = sizeof(AVPicture); return buf_size; } static av_cold int tiff_init(AVCodecContext *avctx){ TiffContext *s = avctx->priv_data; s->width = 0; s->height = 0; s->avctx = avctx; avcodec_get_frame_defaults((AVFrame*)&s->picture); avctx->coded_frame= (AVFrame*)&s->picture; ff_lzw_decode_open(&s->lzw); ff_ccitt_unpack_init(); return 0; } static av_cold int tiff_end(AVCodecContext *avctx) { TiffContext * const s = avctx->priv_data; ff_lzw_decode_close(&s->lzw); if(s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); return 0; } AVCodec tiff_decoder = { "tiff", AVMEDIA_TYPE_VIDEO, CODEC_ID_TIFF, sizeof(TiffContext), tiff_init, NULL, tiff_end, decode_frame, CODEC_CAP_DR1, NULL, .long_name = NULL_IF_CONFIG_SMALL("TIFF image"), };