PeerStreamer

/*

 * 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 > 4){

            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count);

            return -1;

        }

        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;

            }

        }

        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 (ssize > buf_size) {

            av_log(avctx, AV_LOG_ERROR, "Buffer size is smaller than strip size\n");

            return -1;

        }

        if(s->stripdata){

            soff = tget(&s->stripdata, s->sot, s->le);

        }else

            soff = s->stripoff;

        if (soff < 0) {

            av_log(avctx, AV_LOG_ERROR, "Invalid stripoff: %d\n", soff);

            return AVERROR(EINVAL);

        }

        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 ff_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"),

};