TIFF decoder

Originally committed as revision 6682 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 432 insertions, 0 deletions

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
new file mode 100644
index 0000000000..4fa54bb7b1
--- /dev/null
+++ b/libavcodec/tiff.c
@@ -0,0 +1,432 @@
+/*
+ * 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
+ *
+ */
+#include "avcodec.h"
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
+/* abridged list of TIFF tags */
+enum TiffTags{
+    TIFF_WIDTH = 0x100,
+    TIFF_HEIGHT,
+    TIFF_BPP,
+    TIFF_COMPR,
+    TIFF_INVERT = 0x106,
+    TIFF_STRIP_OFFS = 0x111,
+    TIFF_ROWSPERSTRIP = 0x116,
+    TIFF_STRIP_SIZE,
+    TIFF_XPOS = 0x11E,
+    TIFF_YPOS = 0x11F,
+    TIFF_PREDICTOR = 0x13D
+};
+
+enum TiffCompr{
+    TIFF_RAW = 1,
+    TIFF_CCITT_RLE,
+    TIFF_G3,
+    TIFF_G4,
+    TIFF_LZW,
+    TIFF_JPEG,
+    TIFF_NEWJPEG,
+    TIFF_ADOBE_DEFLATE,
+    TIFF_PACKBITS = 0x8005,
+    TIFF_DEFLATE = 0x80B2
+};
+
+enum TiffTypes{
+    TIFF_BYTE = 1,
+    TIFF_STRING,
+    TIFF_SHORT,
+    TIFF_LONG,
+    TIFF_LONGLONG
+};
+
+typedef struct TiffContext {
+    AVCodecContext *avctx;
+    AVFrame picture;
+
+    int width, height;
+    unsigned int bpp;
+    int le;
+    int compr;
+
+    int strips, rps;
+    int sot;
+    uint8_t* stripdata;
+    uint8_t* stripsizes;
+    int stripsize, stripoff;
+} TiffContext;
+
+static int tget_short(uint8_t **p, int le){
+    int v = le ? LE_16(*p) : BE_16(*p);
+    *p += 2;
+    return v;
+}
+
+static int tget_long(uint8_t **p, int le){
+    int v = le ? LE_32(*p) : BE_32(*p);
+    *p += 4;
+    return v;
+}
+
+static int tget(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;
+    }
+}
+
+static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
+    int c, line, pixels, code;
+    uint8_t *ssrc = src;
+    int width = s->width * (s->bpp / 8);
+#ifdef CONFIG_ZLIB
+    uint8_t *zbuf; unsigned long outlen;
+
+    if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
+        outlen = width * lines;
+        if(lines != s->height){
+            av_log(s->avctx, AV_LOG_ERROR, "This decoder won't decode ZLib-packed TIFF with %i lines per strip\n", lines);
+            return -1;
+        }
+        zbuf = av_malloc(outlen);
+        if(uncompress(zbuf, &outlen, src, size) != Z_OK){
+            av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
+            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
+    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, s->width * (s->bpp / 8));
+            src += s->width * (s->bpp / 8);
+            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;
+        }
+        dst += stride;
+    }
+    return 0;
+}
+
+
+static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
+{
+    int tag, type, count, off, value = 0;
+    uint8_t *src, *dst;
+    int i, j, ssize, soff, stride;
+
+    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;
+        default:
+            value = -1;
+            buf = start + off;
+        }
+    }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;
+        s->avctx->pix_fmt = PIX_FMT_RGB24;
+        if(s->width != s->avctx->width || s->height != s->avctx->height){
+            if(avcodec_check_dimensions(s->avctx, s->width, s->height))
+                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;
+        }
+        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);
+                break;
+            case TIFF_SHORT:
+            case TIFF_LONG:
+                s->bpp = tget(&buf, type, s->le) + tget(&buf, type, s->le) + tget(&buf, type, s->le);
+                break;
+            default:
+                s->bpp = -1;
+            }
+        }
+        if(s->bpp != 24){
+            av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported\n");
+            return -1;
+        }
+        break;
+    case TIFF_COMPR:
+        s->compr = value;
+        switch(s->compr){
+        case TIFF_RAW:
+        case TIFF_PACKBITS:
+            break;
+        case TIFF_DEFLATE:
+        case TIFF_ADOBE_DEFLATE:
+#ifdef CONFIG_ZLIB
+            break;
+#else
+            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
+            return -1;
+#endif
+        case TIFF_LZW:
+            av_log(s->avctx, AV_LOG_ERROR, "LZW: not implemented yet\n");
+            return -1;
+        case TIFF_G3:
+            av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
+            return -1;
+        case TIFF_G4:
+            av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
+            return -1;
+        case TIFF_CCITT_RLE:
+            av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE 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(value < 1 || value > s->height){
+            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;
+        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;
+        if(s->stripsizes > end_buf){
+            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
+            return -1;
+        }
+        if(!pic->data[0]){
+            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
+            return -1;
+        }
+        /* now we have the data and may start decoding */
+        stride = pic->linesize[0];
+        dst = pic->data[0];
+        for(i = 0; i < s->height; i += s->rps){
+            if(s->stripsizes)
+                ssize = tget(&s->stripsizes, type, s->le);
+            else
+                ssize = s->stripsize;
+
+            if(s->stripdata){
+                soff = tget(&s->stripdata, s->sot, s->le);
+            }else
+                soff = s->stripoff;
+            src = start + soff;
+            if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
+                break;
+            dst += s->rps * stride;
+        }
+        break;
+    case TIFF_PREDICTOR:
+        if(!pic->data[0]){
+            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
+            return -1;
+        }
+        if(value == 2){
+            src = pic->data[0] + pic->linesize[0];
+            stride = pic->linesize[0];
+            soff = s->bpp >> 3;
+            ssize = s->width * soff;
+            for(i = 0; i < s->height; i++) {
+                for(j = soff; j < ssize; j++)
+                    src[j] += src[j - soff];
+                src += stride;
+            }
+        }
+        break;
+    }
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *data_size,
+                        uint8_t *buf, int buf_size)
+{
+    TiffContext * const s = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
+    int id, le, off;
+    int i, entries;
+
+    //parse image header
+    id = LE_16(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;
+    // 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, p) < 0)
+            return -1;
+        buf += 12;
+    }
+
+    *picture= *(AVFrame*)&s->picture;
+    *data_size = sizeof(AVPicture);
+
+    return buf_size;
+}
+
+static 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;
+    s->picture.data[0] = NULL;
+
+    return 0;
+}
+
+static int tiff_end(AVCodecContext *avctx)
+{
+    TiffContext * const s = avctx->priv_data;
+
+    if(s->picture.data[0])
+        avctx->release_buffer(avctx, &s->picture);
+    return 0;
+}
+
+AVCodec tiff_decoder = {
+    "tiff",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_TIFF,
+    sizeof(TiffContext),
+    tiff_init,
+    NULL,
+    tiff_end,
+    decode_frame,
+    0,
+    NULL
+};