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/*
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 * LCL (LossLess Codec Library) Codec
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 * Copyright (c) 2002-2004 Roberto Togni
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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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 * Libav 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 Libav; 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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 */
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22
/**
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 * @file
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 * LCL (LossLess Codec Library) Video Codec
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 * Decoder for MSZH and ZLIB codecs
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 * Experimental encoder for ZLIB RGB24
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 *
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 * Fourcc: MSZH, ZLIB
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 *
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 * Original Win32 dll:
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 * Ver2.23 By Kenji Oshima 2000.09.20
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 * avimszh.dll, avizlib.dll
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 *
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 * A description of the decoding algorithm can be found here:
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 *   http://www.pcisys.net/~melanson/codecs
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 *
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 * Supports: BGR24 (RGB 24bpp)
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 *
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 */
40

    
41
#include <stdio.h>
42
#include <stdlib.h>
43

    
44
#include "avcodec.h"
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#include "bytestream.h"
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#include "lcl.h"
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#include "libavutil/lzo.h"
48

    
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#if CONFIG_ZLIB_DECODER
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#include <zlib.h>
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#endif
52

    
53
/*
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 * Decoder context
55
 */
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typedef struct LclDecContext {
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    AVFrame pic;
58

    
59
    // Image type
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    int imgtype;
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    // Compression type
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    int compression;
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    // Flags
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    int flags;
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    // Decompressed data size
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    unsigned int decomp_size;
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    // Decompression buffer
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    unsigned char* decomp_buf;
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#if CONFIG_ZLIB_DECODER
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    z_stream zstream;
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#endif
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} LclDecContext;
73

    
74

    
75
/**
76
 * \param srcptr compressed source buffer, must be padded with at least 5 extra bytes
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 * \param destptr must be padded sufficiently for av_memcpy_backptr
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 */
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static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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{
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    unsigned char *destptr_bak = destptr;
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    unsigned char *destptr_end = destptr + destsize;
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    const unsigned char *srcptr_end = srcptr + srclen;
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    unsigned mask = *srcptr++;
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    unsigned maskbit = 0x80;
86

    
87
    while (srcptr < srcptr_end && destptr < destptr_end) {
88
        if (!(mask & maskbit)) {
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            memcpy(destptr, srcptr, 4);
90
            destptr += 4;
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            srcptr += 4;
92
        } else {
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            unsigned ofs = bytestream_get_le16(&srcptr);
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            unsigned cnt = (ofs >> 11) + 1;
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            ofs &= 0x7ff;
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            ofs = FFMIN(ofs, destptr - destptr_bak);
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            cnt *= 4;
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            cnt = FFMIN(cnt, destptr_end - destptr);
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            av_memcpy_backptr(destptr, ofs, cnt);
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            destptr += cnt;
101
        }
102
        maskbit >>= 1;
103
        if (!maskbit) {
104
            mask = *srcptr++;
105
            while (!mask) {
106
                if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
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                memcpy(destptr, srcptr, 32);
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                destptr += 32;
109
                srcptr += 32;
110
                mask = *srcptr++;
111
            }
112
            maskbit = 0x80;
113
        }
114
    }
115

    
116
    return destptr - destptr_bak;
117
}
118

    
119

    
120
#if CONFIG_ZLIB_DECODER
121
/**
122
 * \brief decompress a zlib-compressed data block into decomp_buf
123
 * \param src compressed input buffer
124
 * \param src_len data length in input buffer
125
 * \param offset offset in decomp_buf
126
 * \param expected expected decompressed length
127
 */
128
static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
129
{
130
    LclDecContext *c = avctx->priv_data;
131
    int zret = inflateReset(&c->zstream);
132
    if (zret != Z_OK) {
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        av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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        return -1;
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    }
136
    c->zstream.next_in = src;
137
    c->zstream.avail_in = src_len;
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    c->zstream.next_out = c->decomp_buf + offset;
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    c->zstream.avail_out = c->decomp_size - offset;
140
    zret = inflate(&c->zstream, Z_FINISH);
141
    if (zret != Z_OK && zret != Z_STREAM_END) {
142
        av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
143
        return -1;
144
    }
145
    if (expected != (unsigned int)c->zstream.total_out) {
146
        av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
147
               expected, c->zstream.total_out);
148
        return -1;
149
    }
150
    return c->zstream.total_out;
151
}
152
#endif
153

    
154

    
155
/*
156
 *
157
 * Decode a frame
158
 *
159
 */
160
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
161
{
162
    const uint8_t *buf = avpkt->data;
163
    int buf_size = avpkt->size;
164
    LclDecContext * const c = avctx->priv_data;
165
    unsigned char *encoded = (unsigned char *)buf;
166
    unsigned int pixel_ptr;
167
    int row, col;
168
    unsigned char *outptr;
169
    uint8_t *y_out, *u_out, *v_out;
170
    unsigned int width = avctx->width; // Real image width
171
    unsigned int height = avctx->height; // Real image height
172
    unsigned int mszh_dlen;
173
    unsigned char yq, y1q, uq, vq;
174
    int uqvq;
175
    unsigned int mthread_inlen, mthread_outlen;
176
    unsigned int len = buf_size;
177

    
178
    if(c->pic.data[0])
179
        avctx->release_buffer(avctx, &c->pic);
180

    
181
    c->pic.reference = 0;
182
    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
183
    if(avctx->get_buffer(avctx, &c->pic) < 0){
184
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
185
        return -1;
186
    }
187

    
188
    outptr = c->pic.data[0]; // Output image pointer
189

    
190
    /* Decompress frame */
191
    switch (avctx->codec_id) {
192
    case CODEC_ID_MSZH:
193
        switch (c->compression) {
194
        case COMP_MSZH:
195
            if (c->flags & FLAG_MULTITHREAD) {
196
                mthread_inlen = AV_RL32(encoded);
197
                mthread_inlen = FFMIN(mthread_inlen, len - 8);
198
                mthread_outlen = AV_RL32(encoded+4);
199
                mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
200
                mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
201
                if (mthread_outlen != mszh_dlen) {
202
                    av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
203
                           mthread_outlen, mszh_dlen);
204
                    return -1;
205
                }
206
                mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
207
                                        c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
208
                if (mthread_outlen != mszh_dlen) {
209
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
210
                           mthread_outlen, mszh_dlen);
211
                    return -1;
212
                }
213
                encoded = c->decomp_buf;
214
                len = c->decomp_size;
215
            } else {
216
                mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
217
                if (c->decomp_size != mszh_dlen) {
218
                    av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
219
                           c->decomp_size, mszh_dlen);
220
                    return -1;
221
                }
222
                encoded = c->decomp_buf;
223
                len = mszh_dlen;
224
            }
225
            break;
226
        case COMP_MSZH_NOCOMP:
227
            break;
228
        default:
229
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
230
            return -1;
231
        }
232
        break;
233
#if CONFIG_ZLIB_DECODER
234
    case CODEC_ID_ZLIB:
235
        /* Using the original dll with normal compression (-1) and RGB format
236
         * gives a file with ZLIB fourcc, but frame is really uncompressed.
237
         * To be sure that's true check also frame size */
238
        if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
239
            len == width * height * 3)
240
            break;
241
        if (c->flags & FLAG_MULTITHREAD) {
242
            int ret;
243
            mthread_inlen = AV_RL32(encoded);
244
            mthread_inlen = FFMIN(mthread_inlen, len - 8);
245
            mthread_outlen = AV_RL32(encoded+4);
246
            mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
247
            ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen);
248
            if (ret < 0) return ret;
249
            ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen,
250
                              mthread_outlen, mthread_outlen);
251
            if (ret < 0) return ret;
252
        } else {
253
            int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size);
254
            if (ret < 0) return ret;
255
        }
256
        encoded = c->decomp_buf;
257
        len = c->decomp_size;
258
        break;
259
#endif
260
    default:
261
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
262
        return -1;
263
    }
264

    
265

    
266
    /* Apply PNG filter */
267
    if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
268
        switch (c->imgtype) {
269
        case IMGTYPE_YUV111:
270
        case IMGTYPE_RGB24:
271
            for (row = 0; row < height; row++) {
272
                pixel_ptr = row * width * 3;
273
                yq = encoded[pixel_ptr++];
274
                uqvq = AV_RL16(encoded+pixel_ptr);
275
                pixel_ptr += 2;
276
                for (col = 1; col < width; col++) {
277
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
278
                    uqvq -= AV_RL16(encoded+pixel_ptr+1);
279
                    AV_WL16(encoded+pixel_ptr+1, uqvq);
280
                    pixel_ptr += 3;
281
                }
282
            }
283
            break;
284
        case IMGTYPE_YUV422:
285
            for (row = 0; row < height; row++) {
286
                pixel_ptr = row * width * 2;
287
                yq = uq = vq =0;
288
                for (col = 0; col < width/4; col++) {
289
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
290
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
291
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
292
                    encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
293
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
294
                    encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
295
                    encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
296
                    encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
297
                    pixel_ptr += 8;
298
                }
299
            }
300
            break;
301
        case IMGTYPE_YUV411:
302
            for (row = 0; row < height; row++) {
303
                pixel_ptr = row * width / 2 * 3;
304
                yq = uq = vq =0;
305
                for (col = 0; col < width/4; col++) {
306
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
307
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
308
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
309
                    encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
310
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
311
                    encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
312
                    pixel_ptr += 6;
313
                }
314
            }
315
            break;
316
        case IMGTYPE_YUV211:
317
            for (row = 0; row < height; row++) {
318
                pixel_ptr = row * width * 2;
319
                yq = uq = vq =0;
320
                for (col = 0; col < width/2; col++) {
321
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
322
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
323
                    encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
324
                    encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
325
                    pixel_ptr += 4;
326
                }
327
            }
328
            break;
329
        case IMGTYPE_YUV420:
330
            for (row = 0; row < height/2; row++) {
331
                pixel_ptr = row * width * 3;
332
                yq = y1q = uq = vq =0;
333
                for (col = 0; col < width/2; col++) {
334
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
335
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
336
                    encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
337
                    encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
338
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
339
                    encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
340
                    pixel_ptr += 6;
341
                }
342
            }
343
            break;
344
        default:
345
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
346
            return -1;
347
        }
348
    }
349

    
350
    /* Convert colorspace */
351
    y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0];
352
    u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1];
353
    v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2];
354
    switch (c->imgtype) {
355
    case IMGTYPE_YUV111:
356
        for (row = 0; row < height; row++) {
357
            for (col = 0; col < width; col++) {
358
                y_out[col] = *encoded++;
359
                u_out[col] = *encoded++ + 128;
360
                v_out[col] = *encoded++ + 128;
361
            }
362
            y_out -= c->pic.linesize[0];
363
            u_out -= c->pic.linesize[1];
364
            v_out -= c->pic.linesize[2];
365
        }
366
        break;
367
    case IMGTYPE_YUV422:
368
        for (row = 0; row < height; row++) {
369
            for (col = 0; col < width - 3; col += 4) {
370
                memcpy(y_out + col, encoded, 4);
371
                encoded += 4;
372
                u_out[ col >> 1     ] = *encoded++ + 128;
373
                u_out[(col >> 1) + 1] = *encoded++ + 128;
374
                v_out[ col >> 1     ] = *encoded++ + 128;
375
                v_out[(col >> 1) + 1] = *encoded++ + 128;
376
            }
377
            y_out -= c->pic.linesize[0];
378
            u_out -= c->pic.linesize[1];
379
            v_out -= c->pic.linesize[2];
380
        }
381
        break;
382
    case IMGTYPE_RGB24:
383
        for (row = height - 1; row >= 0; row--) {
384
            pixel_ptr = row * c->pic.linesize[0];
385
            memcpy(outptr + pixel_ptr, encoded, 3 * width);
386
            encoded += 3 * width;
387
        }
388
        break;
389
    case IMGTYPE_YUV411:
390
        for (row = 0; row < height; row++) {
391
            for (col = 0; col < width - 3; col += 4) {
392
                memcpy(y_out + col, encoded, 4);
393
                encoded += 4;
394
                u_out[col >> 2] = *encoded++ + 128;
395
                v_out[col >> 2] = *encoded++ + 128;
396
            }
397
            y_out -= c->pic.linesize[0];
398
            u_out -= c->pic.linesize[1];
399
            v_out -= c->pic.linesize[2];
400
        }
401
        break;
402
    case IMGTYPE_YUV211:
403
        for (row = 0; row < height; row++) {
404
            for (col = 0; col < width - 1; col += 2) {
405
                memcpy(y_out + col, encoded, 2);
406
                encoded += 2;
407
                u_out[col >> 1] = *encoded++ + 128;
408
                v_out[col >> 1] = *encoded++ + 128;
409
            }
410
            y_out -= c->pic.linesize[0];
411
            u_out -= c->pic.linesize[1];
412
            v_out -= c->pic.linesize[2];
413
        }
414
        break;
415
    case IMGTYPE_YUV420:
416
        u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1];
417
        v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2];
418
        for (row = 0; row < height - 1; row += 2) {
419
            for (col = 0; col < width - 1; col += 2) {
420
                memcpy(y_out + col, encoded, 2);
421
                encoded += 2;
422
                memcpy(y_out + col - c->pic.linesize[0], encoded, 2);
423
                encoded += 2;
424
                u_out[col >> 1] = *encoded++ + 128;
425
                v_out[col >> 1] = *encoded++ + 128;
426
            }
427
            y_out -= c->pic.linesize[0] << 1;
428
            u_out -= c->pic.linesize[1];
429
            v_out -= c->pic.linesize[2];
430
        }
431
        break;
432
    default:
433
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
434
        return -1;
435
    }
436

    
437
    *data_size = sizeof(AVFrame);
438
    *(AVFrame*)data = c->pic;
439

    
440
    /* always report that the buffer was completely consumed */
441
    return buf_size;
442
}
443

    
444
/*
445
 *
446
 * Init lcl decoder
447
 *
448
 */
449
static av_cold int decode_init(AVCodecContext *avctx)
450
{
451
    LclDecContext * const c = avctx->priv_data;
452
    unsigned int basesize = avctx->width * avctx->height;
453
    unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING;
454
    unsigned int max_decomp_size;
455

    
456
    if (avctx->extradata_size < 8) {
457
        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
458
        return 1;
459
    }
460

    
461
    /* Check codec type */
462
    if ((avctx->codec_id == CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
463
        (avctx->codec_id == CODEC_ID_ZLIB  && avctx->extradata[7] != CODEC_ZLIB)) {
464
        av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
465
    }
466

    
467
    /* Detect image type */
468
    switch (c->imgtype = avctx->extradata[4]) {
469
    case IMGTYPE_YUV111:
470
        c->decomp_size = basesize * 3;
471
        max_decomp_size = max_basesize * 3;
472
        avctx->pix_fmt = PIX_FMT_YUV444P;
473
        av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
474
        break;
475
    case IMGTYPE_YUV422:
476
        c->decomp_size = basesize * 2;
477
        max_decomp_size = max_basesize * 2;
478
        avctx->pix_fmt = PIX_FMT_YUV422P;
479
        av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
480
        break;
481
    case IMGTYPE_RGB24:
482
        c->decomp_size = basesize * 3;
483
        max_decomp_size = max_basesize * 3;
484
        avctx->pix_fmt = PIX_FMT_BGR24;
485
        av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
486
        break;
487
    case IMGTYPE_YUV411:
488
        c->decomp_size = basesize / 2 * 3;
489
        max_decomp_size = max_basesize / 2 * 3;
490
        avctx->pix_fmt = PIX_FMT_YUV411P;
491
        av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
492
        break;
493
    case IMGTYPE_YUV211:
494
        c->decomp_size = basesize * 2;
495
        max_decomp_size = max_basesize * 2;
496
        avctx->pix_fmt = PIX_FMT_YUV422P;
497
        av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
498
        break;
499
    case IMGTYPE_YUV420:
500
        c->decomp_size = basesize / 2 * 3;
501
        max_decomp_size = max_basesize / 2 * 3;
502
        avctx->pix_fmt = PIX_FMT_YUV420P;
503
        av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
504
        break;
505
    default:
506
        av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
507
        return 1;
508
    }
509

    
510
    /* Detect compression method */
511
    c->compression = (int8_t)avctx->extradata[5];
512
    switch (avctx->codec_id) {
513
    case CODEC_ID_MSZH:
514
        switch (c->compression) {
515
        case COMP_MSZH:
516
            av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
517
            break;
518
        case COMP_MSZH_NOCOMP:
519
            c->decomp_size = 0;
520
            av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
521
            break;
522
        default:
523
            av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
524
            return 1;
525
        }
526
        break;
527
#if CONFIG_ZLIB_DECODER
528
    case CODEC_ID_ZLIB:
529
        switch (c->compression) {
530
        case COMP_ZLIB_HISPEED:
531
            av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
532
            break;
533
        case COMP_ZLIB_HICOMP:
534
            av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
535
            break;
536
        case COMP_ZLIB_NORMAL:
537
            av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
538
            break;
539
        default:
540
            if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
541
                av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
542
                return 1;
543
            }
544
            av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
545
        }
546
        break;
547
#endif
548
    default:
549
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
550
        return 1;
551
    }
552

    
553
    /* Allocate decompression buffer */
554
    if (c->decomp_size) {
555
        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
556
            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
557
            return 1;
558
        }
559
    }
560

    
561
    /* Detect flags */
562
    c->flags = avctx->extradata[6];
563
    if (c->flags & FLAG_MULTITHREAD)
564
        av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
565
    if (c->flags & FLAG_NULLFRAME)
566
        av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
567
    if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
568
        av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
569
    if (c->flags & FLAGMASK_UNUSED)
570
        av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
571

    
572
    /* If needed init zlib */
573
#if CONFIG_ZLIB_DECODER
574
    if (avctx->codec_id == CODEC_ID_ZLIB) {
575
        int zret;
576
        c->zstream.zalloc = Z_NULL;
577
        c->zstream.zfree = Z_NULL;
578
        c->zstream.opaque = Z_NULL;
579
        zret = inflateInit(&c->zstream);
580
        if (zret != Z_OK) {
581
            av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
582
            av_freep(&c->decomp_buf);
583
            return 1;
584
        }
585
    }
586
#endif
587

    
588
    return 0;
589
}
590

    
591
/*
592
 *
593
 * Uninit lcl decoder
594
 *
595
 */
596
static av_cold int decode_end(AVCodecContext *avctx)
597
{
598
    LclDecContext * const c = avctx->priv_data;
599

    
600
    av_freep(&c->decomp_buf);
601
    if (c->pic.data[0])
602
        avctx->release_buffer(avctx, &c->pic);
603
#if CONFIG_ZLIB_DECODER
604
    if (avctx->codec_id == CODEC_ID_ZLIB)
605
        inflateEnd(&c->zstream);
606
#endif
607

    
608
    return 0;
609
}
610

    
611
#if CONFIG_MSZH_DECODER
612
AVCodec ff_mszh_decoder = {
613
    "mszh",
614
    AVMEDIA_TYPE_VIDEO,
615
    CODEC_ID_MSZH,
616
    sizeof(LclDecContext),
617
    decode_init,
618
    NULL,
619
    decode_end,
620
    decode_frame,
621
    CODEC_CAP_DR1,
622
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
623
};
624
#endif
625

    
626
#if CONFIG_ZLIB_DECODER
627
AVCodec ff_zlib_decoder = {
628
    "zlib",
629
    AVMEDIA_TYPE_VIDEO,
630
    CODEC_ID_ZLIB,
631
    sizeof(LclDecContext),
632
    decode_init,
633
    NULL,
634
    decode_end,
635
    decode_frame,
636
    CODEC_CAP_DR1,
637
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
638
};
639
#endif