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ffmpeg / libavcodec / lcldec.c @ 9106a698

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1
/*
2
 * 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 FFmpeg.
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 *
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 * FFmpeg 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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 * 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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 */
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/**
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 * @file libavcodec/lcldec.c
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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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 */
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41
#include <stdio.h>
42
#include <stdlib.h>
43

    
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#include "avcodec.h"
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#include "get_bits.h"
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#include "lcl.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
51

    
52
/*
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 * Decoder context
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 */
55
typedef struct LclDecContext {
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    AVFrame pic;
57

    
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    // 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
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    z_stream zstream;
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#endif
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} LclDecContext;
72

    
73

    
74
/*
75
 *
76
 * Helper functions
77
 *
78
 */
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static inline unsigned char fix (int pix14)
80
{
81
    int tmp;
82

    
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    tmp = (pix14 + 0x80000) >> 20;
84
    if (tmp < 0)
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        return 0;
86
    if (tmp > 255)
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        return 255;
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    return tmp;
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}
90

    
91

    
92

    
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static inline unsigned char get_b (unsigned char yq, signed char bq)
94
{
95
    return fix((yq << 20) + bq * 1858076);
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}
97

    
98

    
99

    
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static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
101
{
102
    return fix((yq << 20) - bq * 360857 - rq * 748830);
103
}
104

    
105

    
106

    
107
static inline unsigned char get_r (unsigned char yq, signed char rq)
108
{
109
    return fix((yq << 20) + rq * 1470103);
110
}
111

    
112

    
113

    
114
static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
115
{
116
    unsigned char *destptr_bak = destptr;
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    unsigned char *destptr_end = destptr + destsize;
118
    unsigned char mask = 0;
119
    unsigned char maskbit = 0;
120
    unsigned int ofs, cnt;
121

    
122
    while ((srclen > 0) && (destptr < destptr_end)) {
123
        if (maskbit == 0) {
124
            mask = *(srcptr++);
125
            maskbit = 8;
126
            srclen--;
127
            continue;
128
        }
129
        if ((mask & (1 << (--maskbit))) == 0) {
130
            if (destptr + 4 > destptr_end)
131
                break;
132
            *(int*)destptr = *(int*)srcptr;
133
            srclen -= 4;
134
            destptr += 4;
135
            srcptr += 4;
136
        } else {
137
            ofs = *(srcptr++);
138
            cnt = *(srcptr++);
139
            ofs += cnt * 256;
140
            cnt = ((cnt >> 3) & 0x1f) + 1;
141
            ofs &= 0x7ff;
142
            srclen -= 2;
143
            cnt *= 4;
144
            if (destptr + cnt > destptr_end) {
145
                cnt =  destptr_end - destptr;
146
            }
147
            for (; cnt > 0; cnt--) {
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                *(destptr) = *(destptr - ofs);
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                destptr++;
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            }
151
        }
152
    }
153

    
154
    return (destptr - destptr_bak);
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}
156

    
157

    
158

    
159
/*
160
 *
161
 * Decode a frame
162
 *
163
 */
164
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
165
{
166
    const uint8_t *buf = avpkt->data;
167
    int buf_size = avpkt->size;
168
    LclDecContext * const c = avctx->priv_data;
169
    unsigned char *encoded = (unsigned char *)buf;
170
    unsigned int pixel_ptr;
171
    int row, col;
172
    unsigned char *outptr;
173
    unsigned int width = avctx->width; // Real image width
174
    unsigned int height = avctx->height; // Real image height
175
    unsigned int mszh_dlen;
176
    unsigned char yq, y1q, uq, vq;
177
    int uqvq;
178
    unsigned int mthread_inlen, mthread_outlen;
179
#if CONFIG_ZLIB
180
    int zret; // Zlib return code
181
#endif
182
    unsigned int len = buf_size;
183

    
184
    if(c->pic.data[0])
185
        avctx->release_buffer(avctx, &c->pic);
186

    
187
    c->pic.reference = 0;
188
    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
189
    if(avctx->get_buffer(avctx, &c->pic) < 0){
190
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
191
        return -1;
192
    }
193

    
194
    outptr = c->pic.data[0]; // Output image pointer
195

    
196
    /* Decompress frame */
197
    switch (avctx->codec_id) {
198
    case CODEC_ID_MSZH:
199
        switch (c->compression) {
200
        case COMP_MSZH:
201
            if (c->flags & FLAG_MULTITHREAD) {
202
                mthread_inlen = *((unsigned int*)encoded);
203
                mthread_outlen = *((unsigned int*)(encoded+4));
204
                if (mthread_outlen > c->decomp_size) // this should not happen
205
                    mthread_outlen = c->decomp_size;
206
                mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
207
                if (mthread_outlen != mszh_dlen) {
208
                    av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
209
                           mthread_outlen, mszh_dlen);
210
                    return -1;
211
                }
212
                mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
213
                                        c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
214
                if (mthread_outlen != mszh_dlen) {
215
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
216
                           mthread_outlen, mszh_dlen);
217
                    return -1;
218
                }
219
                encoded = c->decomp_buf;
220
                len = c->decomp_size;
221
            } else {
222
                mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
223
                if (c->decomp_size != mszh_dlen) {
224
                    av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
225
                           c->decomp_size, mszh_dlen);
226
                    return -1;
227
                }
228
                encoded = c->decomp_buf;
229
                len = mszh_dlen;
230
            }
231
            break;
232
        case COMP_MSZH_NOCOMP:
233
            break;
234
        default:
235
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
236
            return -1;
237
        }
238
        break;
239
    case CODEC_ID_ZLIB:
240
#if CONFIG_ZLIB
241
        /* Using the original dll with normal compression (-1) and RGB format
242
         * gives a file with ZLIB fourcc, but frame is really uncompressed.
243
         * To be sure that's true check also frame size */
244
        if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
245
            (len == width * height * 3))
246
            break;
247
        zret = inflateReset(&(c->zstream));
248
        if (zret != Z_OK) {
249
            av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
250
            return -1;
251
        }
252
        if (c->flags & FLAG_MULTITHREAD) {
253
            mthread_inlen = *((unsigned int*)encoded);
254
            mthread_outlen = *((unsigned int*)(encoded+4));
255
            if (mthread_outlen > c->decomp_size)
256
                mthread_outlen = c->decomp_size;
257
            c->zstream.next_in = encoded + 8;
258
            c->zstream.avail_in = mthread_inlen;
259
            c->zstream.next_out = c->decomp_buf;
260
            c->zstream.avail_out = c->decomp_size;
261
            zret = inflate(&(c->zstream), Z_FINISH);
262
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
263
                av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
264
                return -1;
265
            }
266
            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
267
                av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
268
                       mthread_outlen, c->zstream.total_out);
269
                return -1;
270
            }
271
            zret = inflateReset(&(c->zstream));
272
            if (zret != Z_OK) {
273
                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
274
                return -1;
275
            }
276
            c->zstream.next_in = encoded + 8 + mthread_inlen;
277
            c->zstream.avail_in = len - mthread_inlen;
278
            c->zstream.next_out = c->decomp_buf + mthread_outlen;
279
            c->zstream.avail_out = c->decomp_size - mthread_outlen;
280
            zret = inflate(&(c->zstream), Z_FINISH);
281
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
282
                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
283
                return -1;
284
            }
285
            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
286
                av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
287
                       mthread_outlen, c->zstream.total_out);
288
                return -1;
289
            }
290
        } else {
291
            c->zstream.next_in = encoded;
292
            c->zstream.avail_in = len;
293
            c->zstream.next_out = c->decomp_buf;
294
            c->zstream.avail_out = c->decomp_size;
295
            zret = inflate(&(c->zstream), Z_FINISH);
296
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
297
                av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
298
                return -1;
299
            }
300
            if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
301
                av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
302
                       c->decomp_size, c->zstream.total_out);
303
                return -1;
304
            }
305
        }
306
        encoded = c->decomp_buf;
307
        len = c->decomp_size;
308
#else
309
        av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
310
        return -1;
311
#endif
312
        break;
313
    default:
314
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
315
        return -1;
316
    }
317

    
318

    
319
    /* Apply PNG filter */
320
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
321
        switch (c->imgtype) {
322
        case IMGTYPE_YUV111:
323
        case IMGTYPE_RGB24:
324
            for (row = 0; row < height; row++) {
325
                pixel_ptr = row * width * 3;
326
                yq = encoded[pixel_ptr++];
327
                uqvq = AV_RL16(encoded+pixel_ptr);
328
                pixel_ptr += 2;
329
                for (col = 1; col < width; col++) {
330
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
331
                    uqvq -= AV_RL16(encoded+pixel_ptr+1);
332
                    AV_WL16(encoded+pixel_ptr+1, uqvq);
333
                    pixel_ptr += 3;
334
                }
335
            }
336
            break;
337
        case IMGTYPE_YUV422:
338
            for (row = 0; row < height; row++) {
339
                pixel_ptr = row * width * 2;
340
                yq = uq = vq =0;
341
                for (col = 0; col < width/4; col++) {
342
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
343
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
344
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
345
                    encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
346
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
347
                    encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
348
                    encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
349
                    encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
350
                    pixel_ptr += 8;
351
                }
352
            }
353
            break;
354
        case IMGTYPE_YUV411:
355
            for (row = 0; row < height; row++) {
356
                pixel_ptr = row * width / 2 * 3;
357
                yq = uq = vq =0;
358
                for (col = 0; col < width/4; col++) {
359
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
360
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
361
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
362
                    encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
363
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
364
                    encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
365
                    pixel_ptr += 6;
366
                }
367
            }
368
            break;
369
        case IMGTYPE_YUV211:
370
            for (row = 0; row < height; row++) {
371
                pixel_ptr = row * width * 2;
372
                yq = uq = vq =0;
373
                for (col = 0; col < width/2; col++) {
374
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
375
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
376
                    encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
377
                    encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
378
                    pixel_ptr += 4;
379
                }
380
            }
381
            break;
382
        case IMGTYPE_YUV420:
383
            for (row = 0; row < height/2; row++) {
384
                pixel_ptr = row * width * 3;
385
                yq = y1q = uq = vq =0;
386
                for (col = 0; col < width/2; col++) {
387
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
388
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
389
                    encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
390
                    encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
391
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
392
                    encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
393
                    pixel_ptr += 6;
394
                }
395
            }
396
            break;
397
        default:
398
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
399
            return -1;
400
        }
401
    }
402

    
403
    /* Convert colorspace */
404
    switch (c->imgtype) {
405
    case IMGTYPE_YUV111:
406
        for (row = height - 1; row >= 0; row--) {
407
            pixel_ptr = row * c->pic.linesize[0];
408
            for (col = 0; col < width; col++) {
409
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
410
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
411
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
412
                encoded += 3;
413
            }
414
        }
415
        break;
416
    case IMGTYPE_YUV422:
417
        for (row = height - 1; row >= 0; row--) {
418
            pixel_ptr = row * c->pic.linesize[0];
419
            for (col = 0; col < width/4; col++) {
420
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
421
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
422
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
423
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
424
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
425
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
426
                outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
427
                outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
428
                outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
429
                outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
430
                outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
431
                outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
432
                encoded += 8;
433
            }
434
        }
435
        break;
436
    case IMGTYPE_RGB24:
437
        for (row = height - 1; row >= 0; row--) {
438
            pixel_ptr = row * c->pic.linesize[0];
439
            for (col = 0; col < width; col++) {
440
                outptr[pixel_ptr++] = encoded[0];
441
                outptr[pixel_ptr++] = encoded[1];
442
                outptr[pixel_ptr++] = encoded[2];
443
                encoded += 3;
444
            }
445
        }
446
        break;
447
    case IMGTYPE_YUV411:
448
        for (row = height - 1; row >= 0; row--) {
449
            pixel_ptr = row * c->pic.linesize[0];
450
            for (col = 0; col < width/4; col++) {
451
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
452
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
453
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
454
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
455
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
456
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
457
                outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
458
                outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
459
                outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
460
                outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
461
                outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
462
                outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
463
                encoded += 6;
464
            }
465
        }
466
        break;
467
    case IMGTYPE_YUV211:
468
        for (row = height - 1; row >= 0; row--) {
469
            pixel_ptr = row * c->pic.linesize[0];
470
            for (col = 0; col < width/2; col++) {
471
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
472
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
473
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
474
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
475
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
476
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
477
                encoded += 4;
478
            }
479
        }
480
        break;
481
    case IMGTYPE_YUV420:
482
        for (row = height / 2 - 1; row >= 0; row--) {
483
            pixel_ptr = 2 * row * c->pic.linesize[0];
484
            for (col = 0; col < width/2; col++) {
485
                outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
486
                outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
487
                outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
488
                outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
489
                outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
490
                outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
491
                outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
492
                outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
493
                outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
494
                outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
495
                outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
496
                outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
497
                pixel_ptr += 6;
498
                encoded += 6;
499
            }
500
        }
501
        break;
502
    default:
503
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
504
        return -1;
505
    }
506

    
507
    *data_size = sizeof(AVFrame);
508
    *(AVFrame*)data = c->pic;
509

    
510
    /* always report that the buffer was completely consumed */
511
    return buf_size;
512
}
513

    
514
/*
515
 *
516
 * Init lcl decoder
517
 *
518
 */
519
static av_cold int decode_init(AVCodecContext *avctx)
520
{
521
    LclDecContext * const c = avctx->priv_data;
522
    unsigned int basesize = avctx->width * avctx->height;
523
    unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
524
    unsigned int max_decomp_size;
525
    int zret; // Zlib return code
526

    
527
    c->pic.data[0] = NULL;
528

    
529
#if CONFIG_ZLIB
530
    // Needed if zlib unused or init aborted before inflateInit
531
    memset(&(c->zstream), 0, sizeof(z_stream));
532
#endif
533

    
534
    if (avctx->extradata_size < 8) {
535
        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
536
        return 1;
537
    }
538

    
539
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
540
        return 1;
541
    }
542

    
543
    /* Check codec type */
544
    if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
545
        ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
546
        av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
547
    }
548

    
549
    /* Detect image type */
550
    switch (c->imgtype = *((char *)avctx->extradata + 4)) {
551
    case IMGTYPE_YUV111:
552
        c->decomp_size = basesize * 3;
553
        max_decomp_size = max_basesize * 3;
554
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
555
        break;
556
    case IMGTYPE_YUV422:
557
        c->decomp_size = basesize * 2;
558
        max_decomp_size = max_basesize * 2;
559
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
560
        break;
561
    case IMGTYPE_RGB24:
562
        c->decomp_size = basesize * 3;
563
        max_decomp_size = max_basesize * 3;
564
        av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
565
        break;
566
    case IMGTYPE_YUV411:
567
        c->decomp_size = basesize / 2 * 3;
568
        max_decomp_size = max_basesize / 2 * 3;
569
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
570
        break;
571
    case IMGTYPE_YUV211:
572
        c->decomp_size = basesize * 2;
573
        max_decomp_size = max_basesize * 2;
574
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
575
        break;
576
    case IMGTYPE_YUV420:
577
        c->decomp_size = basesize / 2 * 3;
578
        max_decomp_size = max_basesize / 2 * 3;
579
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
580
        break;
581
    default:
582
        av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
583
        return 1;
584
    }
585

    
586
    /* Detect compression method */
587
    c->compression = *((char *)avctx->extradata + 5);
588
    switch (avctx->codec_id) {
589
    case CODEC_ID_MSZH:
590
        switch (c->compression) {
591
        case COMP_MSZH:
592
            av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
593
            break;
594
        case COMP_MSZH_NOCOMP:
595
            c->decomp_size = 0;
596
            av_log(avctx, AV_LOG_INFO, "No compression.\n");
597
            break;
598
        default:
599
            av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
600
            return 1;
601
        }
602
        break;
603
    case CODEC_ID_ZLIB:
604
#if CONFIG_ZLIB
605
        switch (c->compression) {
606
        case COMP_ZLIB_HISPEED:
607
            av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
608
            break;
609
        case COMP_ZLIB_HICOMP:
610
            av_log(avctx, AV_LOG_INFO, "High compression.\n");
611
            break;
612
        case COMP_ZLIB_NORMAL:
613
            av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
614
            break;
615
        default:
616
            if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
617
                av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
618
                return 1;
619
            }
620
            av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
621
        }
622
#else
623
        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
624
        return 1;
625
#endif
626
        break;
627
    default:
628
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
629
        return 1;
630
    }
631

    
632
    /* Allocate decompression buffer */
633
    if (c->decomp_size) {
634
        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
635
            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
636
            return 1;
637
        }
638
    }
639

    
640
    /* Detect flags */
641
    c->flags = *((char *)avctx->extradata + 6);
642
    if (c->flags & FLAG_MULTITHREAD)
643
        av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
644
    if (c->flags & FLAG_NULLFRAME)
645
        av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
646
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
647
        av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
648
    if (c->flags & FLAGMASK_UNUSED)
649
        av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
650

    
651
    /* If needed init zlib */
652
    if (avctx->codec_id == CODEC_ID_ZLIB) {
653
#if CONFIG_ZLIB
654
        c->zstream.zalloc = Z_NULL;
655
        c->zstream.zfree = Z_NULL;
656
        c->zstream.opaque = Z_NULL;
657
        zret = inflateInit(&(c->zstream));
658
        if (zret != Z_OK) {
659
            av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
660
            return 1;
661
        }
662
#else
663
        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
664
        return 1;
665
#endif
666
    }
667

    
668
    avctx->pix_fmt = PIX_FMT_BGR24;
669

    
670
    return 0;
671
}
672

    
673
/*
674
 *
675
 * Uninit lcl decoder
676
 *
677
 */
678
static av_cold int decode_end(AVCodecContext *avctx)
679
{
680
    LclDecContext * const c = avctx->priv_data;
681

    
682
    if (c->pic.data[0])
683
        avctx->release_buffer(avctx, &c->pic);
684
#if CONFIG_ZLIB
685
    inflateEnd(&(c->zstream));
686
#endif
687

    
688
    return 0;
689
}
690

    
691
#if CONFIG_MSZH_DECODER
692
AVCodec mszh_decoder = {
693
    "mszh",
694
    CODEC_TYPE_VIDEO,
695
    CODEC_ID_MSZH,
696
    sizeof(LclDecContext),
697
    decode_init,
698
    NULL,
699
    decode_end,
700
    decode_frame,
701
    CODEC_CAP_DR1,
702
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
703
};
704
#endif
705

    
706
#if CONFIG_ZLIB_DECODER
707
AVCodec zlib_decoder = {
708
    "zlib",
709
    CODEC_TYPE_VIDEO,
710
    CODEC_ID_ZLIB,
711
    sizeof(LclDecContext),
712
    decode_init,
713
    NULL,
714
    decode_end,
715
    decode_frame,
716
    CODEC_CAP_DR1,
717
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
718
};
719
#endif