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ffmpeg / libavcodec / tiffenc.c @ 72415b2a

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1
/*
2
 * TIFF image encoder
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 * Copyright (c) 2007 Bartlomiej Wolowiec
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
23
 * TIFF image encoder
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 * @file libavcodec/tiffenc.c
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 * @author Bartlomiej Wolowiec
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 */
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#include "avcodec.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#include "bytestream.h"
32
#include "tiff.h"
33
#include "rle.h"
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#include "lzw.h"
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#include "put_bits.h"
36

    
37
#define TIFF_MAX_ENTRY 32
38

    
39
/** sizes of various TIFF field types (string size = 1)*/
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static const uint8_t type_sizes2[6] = {
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    0, 1, 1, 2, 4, 8
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};
43

    
44
typedef struct TiffEncoderContext {
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    AVCodecContext *avctx;
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    AVFrame picture;
47

    
48
    int width;                          ///< picture width
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    int height;                         ///< picture height
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    unsigned int bpp;                   ///< bits per pixel
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    int compr;                          ///< compression level
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    int bpp_tab_size;                   ///< bpp_tab size
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    int photometric_interpretation;     ///< photometric interpretation
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    int strips;                         ///< number of strips
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    int rps;                            ///< row per strip
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    uint8_t entries[TIFF_MAX_ENTRY*12]; ///< entires in header
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    int num_entries;                    ///< number of entires
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    uint8_t **buf;                      ///< actual position in buffer
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    uint8_t *buf_start;                 ///< pointer to first byte in buffer
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    int buf_size;                       ///< buffer size
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    uint16_t subsampling[2];            ///< YUV subsampling factors
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    struct LZWEncodeState *lzws;        ///< LZW Encode state
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} TiffEncoderContext;
64

    
65

    
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/**
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 * Check free space in buffer
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 * @param s Tiff context
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 * @param need Needed bytes
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 * @return 0 - ok, 1 - no free space
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 */
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inline static int check_size(TiffEncoderContext * s, uint64_t need)
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{
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    if (s->buf_size < *s->buf - s->buf_start + need) {
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        *s->buf = s->buf_start + s->buf_size + 1;
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        av_log(s->avctx, AV_LOG_ERROR, "Buffer is too small\n");
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        return 1;
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    }
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    return 0;
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}
81

    
82
/**
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 * Put n values to buffer
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 *
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 * @param p Pointer to pointer to output buffer
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 * @param n Number of values
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 * @param val Pointer to values
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 * @param type Type of values
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 * @param flip =0 - normal copy, >0 - flip
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 */
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static void tnput(uint8_t ** p, int n, const uint8_t * val, enum TiffTypes type,
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                  int flip)
93
{
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    int i;
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#if HAVE_BIGENDIAN
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    flip ^= ((int[]) {0, 0, 0, 1, 3, 3})[type];
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#endif
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    for (i = 0; i < n * type_sizes2[type]; i++)
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        *(*p)++ = val[i ^ flip];
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}
101

    
102
/**
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 * Add entry to directory in tiff header.
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 * @param s Tiff context
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 * @param tag Tag that identifies the entry
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 * @param type Entry type
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 * @param count The number of values
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 * @param ptr_val Pointer to values
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 */
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static void add_entry(TiffEncoderContext * s,
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                      enum TiffTags tag, enum TiffTypes type, int count,
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                      const void *ptr_val)
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{
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    uint8_t *entries_ptr = s->entries + 12 * s->num_entries;
115

    
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    assert(s->num_entries < TIFF_MAX_ENTRY);
117

    
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    bytestream_put_le16(&entries_ptr, tag);
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    bytestream_put_le16(&entries_ptr, type);
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    bytestream_put_le32(&entries_ptr, count);
121

    
122
    if (type_sizes[type] * count <= 4) {
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        tnput(&entries_ptr, count, ptr_val, type, 0);
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    } else {
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        bytestream_put_le32(&entries_ptr, *s->buf - s->buf_start);
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        check_size(s, count * type_sizes2[type]);
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        tnput(s->buf, count, ptr_val, type, 0);
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    }
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    s->num_entries++;
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}
132

    
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static void add_entry1(TiffEncoderContext * s,
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                       enum TiffTags tag, enum TiffTypes type, int val){
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    uint16_t w = val;
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    uint32_t dw= val;
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    add_entry(s, tag, type, 1, type == TIFF_SHORT ? (void *)&w : (void *)&dw);
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}
139

    
140
/**
141
 * Encode one strip in tiff file
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 *
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 * @param s Tiff context
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 * @param src Input buffer
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 * @param dst Output buffer
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 * @param n Size of input buffer
147
 * @param compr Compression method
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 * @return Number of output bytes. If an output error is encountered, -1 returned
149
 */
150
static int encode_strip(TiffEncoderContext * s, const int8_t * src,
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                        uint8_t * dst, int n, int compr)
152
{
153

    
154
    switch (compr) {
155
#if CONFIG_ZLIB
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    case TIFF_DEFLATE:
157
    case TIFF_ADOBE_DEFLATE:
158
        {
159
            unsigned long zlen = s->buf_size - (*s->buf - s->buf_start);
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            if (compress(dst, &zlen, src, n) != Z_OK) {
161
                av_log(s->avctx, AV_LOG_ERROR, "Compressing failed\n");
162
                return -1;
163
            }
164
            return zlen;
165
        }
166
#endif
167
    case TIFF_RAW:
168
        if (check_size(s, n))
169
            return -1;
170
        memcpy(dst, src, n);
171
        return n;
172
    case TIFF_PACKBITS:
173
        return ff_rle_encode(dst, s->buf_size - (*s->buf - s->buf_start), src, 1, n, 2, 0xff, -1, 0);
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    case TIFF_LZW:
175
        return ff_lzw_encode(s->lzws, src, n);
176
    default:
177
        return -1;
178
    }
179
}
180

    
181
static void pack_yuv(TiffEncoderContext * s, uint8_t * dst, int lnum)
182
{
183
    AVFrame *p = &s->picture;
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    int i, j, k;
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    int w = (s->width - 1) / s->subsampling[0] + 1;
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    uint8_t *pu = &p->data[1][lnum / s->subsampling[1] * p->linesize[1]];
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    uint8_t *pv = &p->data[2][lnum / s->subsampling[1] * p->linesize[2]];
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    for (i = 0; i < w; i++){
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        for (j = 0; j < s->subsampling[1]; j++)
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            for (k = 0; k < s->subsampling[0]; k++)
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                *dst++ = p->data[0][(lnum + j) * p->linesize[0] +
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                                    i * s->subsampling[0] + k];
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        *dst++ = *pu++;
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        *dst++ = *pv++;
195
    }
196
}
197

    
198
static int encode_frame(AVCodecContext * avctx, unsigned char *buf,
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                        int buf_size, void *data)
200
{
201
    TiffEncoderContext *s = avctx->priv_data;
202
    AVFrame *pict = data;
203
    AVFrame *const p = (AVFrame *) & s->picture;
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    int i;
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    int n;
206
    uint8_t *ptr = buf;
207
    uint8_t *offset;
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    uint32_t strips;
209
    uint32_t *strip_sizes = NULL;
210
    uint32_t *strip_offsets = NULL;
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    int bytes_per_row;
212
    uint32_t res[2] = { 72, 1 };        // image resolution (72/1)
213
    static const uint16_t bpp_tab[] = { 8, 8, 8, 8 };
214
    int ret = -1;
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    int is_yuv = 0;
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    uint8_t *yuv_line = NULL;
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    int shift_h, shift_v;
218

    
219
    s->buf_start = buf;
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    s->buf = &ptr;
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    s->buf_size = buf_size;
222

    
223
    *p = *pict;
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    p->pict_type = FF_I_TYPE;
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    p->key_frame = 1;
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    avctx->coded_frame= &s->picture;
227

    
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    s->compr = TIFF_PACKBITS;
229
    if (avctx->compression_level == 0) {
230
        s->compr = TIFF_RAW;
231
    } else if(avctx->compression_level == 2) {
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        s->compr = TIFF_LZW;
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#if CONFIG_ZLIB
234
    } else if ((avctx->compression_level >= 3)) {
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        s->compr = TIFF_DEFLATE;
236
#endif
237
    }
238

    
239
    s->width = avctx->width;
240
    s->height = avctx->height;
241
    s->subsampling[0] = 1;
242
    s->subsampling[1] = 1;
243

    
244
    switch (avctx->pix_fmt) {
245
    case PIX_FMT_RGB24:
246
        s->bpp = 24;
247
        s->photometric_interpretation = 2;
248
        break;
249
    case PIX_FMT_GRAY8:
250
        s->bpp = 8;
251
        s->photometric_interpretation = 1;
252
        break;
253
    case PIX_FMT_PAL8:
254
        s->bpp = 8;
255
        s->photometric_interpretation = 3;
256
        break;
257
    case PIX_FMT_MONOBLACK:
258
        s->bpp = 1;
259
        s->photometric_interpretation = 1;
260
        break;
261
    case PIX_FMT_MONOWHITE:
262
        s->bpp = 1;
263
        s->photometric_interpretation = 0;
264
        break;
265
    case PIX_FMT_YUV420P:
266
    case PIX_FMT_YUV422P:
267
    case PIX_FMT_YUV444P:
268
    case PIX_FMT_YUV410P:
269
    case PIX_FMT_YUV411P:
270
        s->photometric_interpretation = 6;
271
        avcodec_get_chroma_sub_sample(avctx->pix_fmt,
272
                &shift_h, &shift_v);
273
        s->bpp = 8 + (16 >> (shift_h + shift_v));
274
        s->subsampling[0] = 1 << shift_h;
275
        s->subsampling[1] = 1 << shift_v;
276
        s->bpp_tab_size = 3;
277
        is_yuv = 1;
278
        break;
279
    default:
280
        av_log(s->avctx, AV_LOG_ERROR,
281
               "This colors format is not supported\n");
282
        return -1;
283
    }
284
    if (!is_yuv)
285
        s->bpp_tab_size = (s->bpp >> 3);
286

    
287
    if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE || s->compr == TIFF_LZW)
288
        //best choose for DEFLATE
289
        s->rps = s->height;
290
    else
291
        s->rps = FFMAX(8192 / (((s->width * s->bpp) >> 3) + 1), 1);     // suggest size of strip
292
    s->rps = ((s->rps - 1) / s->subsampling[1] + 1) * s->subsampling[1]; // round rps up
293

    
294
    strips = (s->height - 1) / s->rps + 1;
295

    
296
    if (check_size(s, 8))
297
        goto fail;
298

    
299
    // write header
300
    bytestream_put_le16(&ptr, 0x4949);
301
    bytestream_put_le16(&ptr, 42);
302

    
303
    offset = ptr;
304
    bytestream_put_le32(&ptr, 0);
305

    
306
    strip_sizes = av_mallocz(sizeof(*strip_sizes) * strips);
307
    strip_offsets = av_mallocz(sizeof(*strip_offsets) * strips);
308

    
309
    bytes_per_row = (((s->width - 1)/s->subsampling[0] + 1) * s->bpp
310
                    * s->subsampling[0] * s->subsampling[1] + 7) >> 3;
311
    if (is_yuv){
312
        yuv_line = av_malloc(bytes_per_row);
313
        if (yuv_line == NULL){
314
            av_log(s->avctx, AV_LOG_ERROR, "Not enough memory\n");
315
            goto fail;
316
        }
317
    }
318

    
319
#if CONFIG_ZLIB
320
    if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
321
        uint8_t *zbuf;
322
        int zlen, zn;
323
        int j;
324

    
325
        zlen = bytes_per_row * s->rps;
326
        zbuf = av_malloc(zlen);
327
        strip_offsets[0] = ptr - buf;
328
        zn = 0;
329
        for (j = 0; j < s->rps; j++) {
330
            if (is_yuv){
331
                pack_yuv(s, yuv_line, j);
332
                memcpy(zbuf + zn, yuv_line, bytes_per_row);
333
                j += s->subsampling[1] - 1;
334
            }
335
            else
336
                memcpy(zbuf + j * bytes_per_row,
337
                       p->data[0] + j * p->linesize[0], bytes_per_row);
338
            zn += bytes_per_row;
339
        }
340
        n = encode_strip(s, zbuf, ptr, zn, s->compr);
341
        av_free(zbuf);
342
        if (n<0) {
343
            av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n");
344
            goto fail;
345
        }
346
        ptr += n;
347
        strip_sizes[0] = ptr - buf - strip_offsets[0];
348
    } else
349
#endif
350
    {
351
        if(s->compr == TIFF_LZW)
352
            s->lzws = av_malloc(ff_lzw_encode_state_size);
353
        for (i = 0; i < s->height; i++) {
354
            if (strip_sizes[i / s->rps] == 0) {
355
                if(s->compr == TIFF_LZW){
356
                    ff_lzw_encode_init(s->lzws, ptr, s->buf_size - (*s->buf - s->buf_start),
357
                                       12, FF_LZW_TIFF, put_bits);
358
                }
359
                strip_offsets[i / s->rps] = ptr - buf;
360
            }
361
            if (is_yuv){
362
                 pack_yuv(s, yuv_line, i);
363
                 n = encode_strip(s, yuv_line, ptr, bytes_per_row, s->compr);
364
                 i += s->subsampling[1] - 1;
365
            }
366
            else
367
                n = encode_strip(s, p->data[0] + i * p->linesize[0],
368
                        ptr, bytes_per_row, s->compr);
369
            if (n < 0) {
370
                av_log(s->avctx, AV_LOG_ERROR, "Encode strip failed\n");
371
                goto fail;
372
            }
373
            strip_sizes[i / s->rps] += n;
374
            ptr += n;
375
            if(s->compr == TIFF_LZW && (i==s->height-1 || i%s->rps == s->rps-1)){
376
                int ret;
377
                ret = ff_lzw_encode_flush(s->lzws, flush_put_bits);
378
                strip_sizes[(i / s->rps )] += ret ;
379
                ptr += ret;
380
            }
381
        }
382
        if(s->compr == TIFF_LZW)
383
            av_free(s->lzws);
384
    }
385

    
386
    s->num_entries = 0;
387

    
388
    add_entry1(s,TIFF_SUBFILE,           TIFF_LONG,             0);
389
    add_entry1(s,TIFF_WIDTH,             TIFF_LONG,             s->width);
390
    add_entry1(s,TIFF_HEIGHT,            TIFF_LONG,             s->height);
391

    
392
    if (s->bpp_tab_size)
393
    add_entry(s, TIFF_BPP,               TIFF_SHORT,    s->bpp_tab_size, bpp_tab);
394

    
395
    add_entry1(s,TIFF_COMPR,             TIFF_SHORT,            s->compr);
396
    add_entry1(s,TIFF_INVERT,            TIFF_SHORT,            s->photometric_interpretation);
397
    add_entry(s, TIFF_STRIP_OFFS,        TIFF_LONG,     strips, strip_offsets);
398

    
399
    if (s->bpp_tab_size)
400
    add_entry1(s,TIFF_SAMPLES_PER_PIXEL, TIFF_SHORT,            s->bpp_tab_size);
401

    
402
    add_entry1(s,TIFF_ROWSPERSTRIP,      TIFF_LONG,             s->rps);
403
    add_entry(s, TIFF_STRIP_SIZE,        TIFF_LONG,     strips, strip_sizes);
404
    add_entry(s, TIFF_XRES,              TIFF_RATIONAL, 1,      res);
405
    add_entry(s, TIFF_YRES,              TIFF_RATIONAL, 1,      res);
406
    add_entry1(s,TIFF_RES_UNIT,          TIFF_SHORT,            2);
407

    
408
    if(!(avctx->flags & CODEC_FLAG_BITEXACT))
409
    add_entry(s, TIFF_SOFTWARE_NAME,     TIFF_STRING,
410
              strlen(LIBAVCODEC_IDENT) + 1, LIBAVCODEC_IDENT);
411

    
412
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
413
        uint16_t pal[256 * 3];
414
        for (i = 0; i < 256; i++) {
415
            uint32_t rgb = *(uint32_t *) (p->data[1] + i * 4);
416
            pal[i]       = ((rgb >> 16) & 0xff) * 257;
417
            pal[i + 256] = ((rgb >> 8 ) & 0xff) * 257;
418
            pal[i + 512] = ( rgb        & 0xff) * 257;
419
        }
420
        add_entry(s, TIFF_PAL, TIFF_SHORT, 256 * 3, pal);
421
    }
422
    if (is_yuv){
423
        /** according to CCIR Recommendation 601.1 */
424
        uint32_t refbw[12] = {15, 1, 235, 1, 128, 1, 240, 1, 128, 1, 240, 1};
425
        add_entry(s, TIFF_YCBCR_SUBSAMPLING, TIFF_SHORT,    2, s->subsampling);
426
        add_entry(s, TIFF_REFERENCE_BW,      TIFF_RATIONAL, 6, refbw);
427
    }
428
    bytestream_put_le32(&offset, ptr - buf);    // write offset to dir
429

    
430
    if (check_size(s, 6 + s->num_entries * 12))
431
        goto fail;
432
    bytestream_put_le16(&ptr, s->num_entries);  // write tag count
433
    bytestream_put_buffer(&ptr, s->entries, s->num_entries * 12);
434
    bytestream_put_le32(&ptr, 0);
435

    
436
    ret = ptr - buf;
437

    
438
fail:
439
    av_free(strip_sizes);
440
    av_free(strip_offsets);
441
    av_free(yuv_line);
442
    return ret;
443
}
444

    
445
AVCodec tiff_encoder = {
446
    "tiff",
447
    AVMEDIA_TYPE_VIDEO,
448
    CODEC_ID_TIFF,
449
    sizeof(TiffEncoderContext),
450
    NULL,
451
    encode_frame,
452
    NULL,
453
    NULL,
454
    0,
455
    NULL,
456
    .pix_fmts =
457
        (const enum PixelFormat[]) {PIX_FMT_RGB24, PIX_FMT_PAL8, PIX_FMT_GRAY8,
458
                              PIX_FMT_MONOBLACK, PIX_FMT_MONOWHITE,
459
                              PIX_FMT_YUV420P, PIX_FMT_YUV422P,
460
                              PIX_FMT_YUV444P, PIX_FMT_YUV410P,
461
                              PIX_FMT_YUV411P,
462
                              PIX_FMT_NONE},
463
    .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
464
};