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/*
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 * Westwood Studios VQA Video Decoder
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 * Copyright (C) 2003 the ffmpeg project
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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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/**
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 * @file vqavideo.c
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 * VQA Video Decoder by Mike Melanson (melanson@pcisys.net)
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 * For more information about the VQA format, visit:
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 *   http://wiki.multimedia.cx/index.php?title=VQA
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 *
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 * The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
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 * on the type of data in the file.
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 *
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 * This decoder needs the 42-byte VQHD header from the beginning
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 * of the VQA file passed through the extradata field. The VQHD header
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 * is laid out as:
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 *
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 *   bytes 0-3   chunk fourcc: 'VQHD'
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 *   bytes 4-7   chunk size in big-endian format, should be 0x0000002A
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 *   bytes 8-49  VQHD chunk data
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 *
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 * Bytes 8-49 are what this decoder expects to see.
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 *
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 * Briefly, VQA is a vector quantized animation format that operates in a
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 * VGA palettized colorspace. It operates on pixel vectors (blocks)
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 * of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
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 * codebooks, palette information, and code maps for rendering vectors onto
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 * frames. Any of these components can also be compressed with a run-length
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 * encoding (RLE) algorithm commonly referred to as "format80".
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 *
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 * VQA takes a novel approach to rate control. Each group of n frames
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 * (usually, n = 8) relies on a different vector codebook. Rather than
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 * transporting an entire codebook every 8th frame, the new codebook is
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 * broken up into 8 pieces and sent along with the compressed video chunks
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 * for each of the 8 frames preceding the 8 frames which require the
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 * codebook. A full codebook is also sent on the very first frame of a
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 * file. This is an interesting technique, although it makes random file
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 * seeking difficult despite the fact that the frames are all intracoded.
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 *
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 * V1,2 VQA uses 12-bit codebook indices. If the 12-bit indices were
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 * packed into bytes and then RLE compressed, bytewise, the results would
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 * be poor. That is why the coding method divides each index into 2 parts,
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 * the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
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 * together and the 8-bit pieces together. If most of the vectors are
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 * clustered into one group of 256 vectors, most of the 4-bit index pieces
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 * should be the same.
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 */
66

    
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#include <stdio.h>
68
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
71

    
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#include "avcodec.h"
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#include "dsputil.h"
74

    
75
#define PALETTE_COUNT 256
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#define VQA_HEADER_SIZE 0x2A
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#define CHUNK_PREAMBLE_SIZE 8
78

    
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/* allocate the maximum vector space, regardless of the file version:
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 * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
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#define MAX_CODEBOOK_VECTORS 0xFF00
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#define SOLID_PIXEL_VECTORS 0x100
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#define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
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#define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
85

    
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#define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
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#define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
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#define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
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#define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
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#define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
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#define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
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#define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
93

    
94
#define VQA_DEBUG 0
95

    
96
#if VQA_DEBUG
97
#define vqa_debug printf
98
#else
99
static inline void vqa_debug(const char *format, ...) { }
100
#endif
101

    
102
typedef struct VqaContext {
103

    
104
    AVCodecContext *avctx;
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    DSPContext dsp;
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    AVFrame frame;
107

    
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    unsigned char *buf;
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    int size;
110

    
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    uint32_t palette[PALETTE_COUNT];
112

    
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    int width;   /* width of a frame */
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    int height;   /* height of a frame */
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    int vector_width;  /* width of individual vector */
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    int vector_height;  /* height of individual vector */
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    int vqa_version;  /* this should be either 1, 2 or 3 */
118

    
119
    unsigned char *codebook;         /* the current codebook */
120
    int codebook_size;
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    unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
122
    int next_codebook_buffer_index;
123

    
124
    unsigned char *decode_buffer;
125
    int decode_buffer_size;
126

    
127
    /* number of frames to go before replacing codebook */
128
    int partial_countdown;
129
    int partial_count;
130

    
131
} VqaContext;
132

    
133
static int vqa_decode_init(AVCodecContext *avctx)
134
{
135
    VqaContext *s = avctx->priv_data;
136
    unsigned char *vqa_header;
137
    int i, j, codebook_index;;
138

    
139
    s->avctx = avctx;
140
    avctx->pix_fmt = PIX_FMT_PAL8;
141
    dsputil_init(&s->dsp, avctx);
142

    
143
    /* make sure the extradata made it */
144
    if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
145
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
146
        return -1;
147
    }
148

    
149
    /* load up the VQA parameters from the header */
150
    vqa_header = (unsigned char *)s->avctx->extradata;
151
    s->vqa_version = vqa_header[0];
152
    s->width = AV_RL16(&vqa_header[6]);
153
    s->height = AV_RL16(&vqa_header[8]);
154
    if(avcodec_check_dimensions(avctx, s->width, s->height)){
155
        s->width= s->height= 0;
156
        return -1;
157
    }
158
    s->vector_width = vqa_header[10];
159
    s->vector_height = vqa_header[11];
160
    s->partial_count = s->partial_countdown = vqa_header[13];
161

    
162
    /* the vector dimensions have to meet very stringent requirements */
163
    if ((s->vector_width != 4) ||
164
        ((s->vector_height != 2) && (s->vector_height != 4))) {
165
        /* return without further initialization */
166
        return -1;
167
    }
168

    
169
    /* allocate codebooks */
170
    s->codebook_size = MAX_CODEBOOK_SIZE;
171
    s->codebook = av_malloc(s->codebook_size);
172
    s->next_codebook_buffer = av_malloc(s->codebook_size);
173

    
174
    /* initialize the solid-color vectors */
175
    if (s->vector_height == 4) {
176
        codebook_index = 0xFF00 * 16;
177
        for (i = 0; i < 256; i++)
178
            for (j = 0; j < 16; j++)
179
                s->codebook[codebook_index++] = i;
180
    } else {
181
        codebook_index = 0xF00 * 8;
182
        for (i = 0; i < 256; i++)
183
            for (j = 0; j < 8; j++)
184
                s->codebook[codebook_index++] = i;
185
    }
186
    s->next_codebook_buffer_index = 0;
187

    
188
    /* allocate decode buffer */
189
    s->decode_buffer_size = (s->width / s->vector_width) *
190
        (s->height / s->vector_height) * 2;
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    s->decode_buffer = av_malloc(s->decode_buffer_size);
192

    
193
    s->frame.data[0] = NULL;
194

    
195
    return 0;
196
}
197

    
198
#define CHECK_COUNT() \
199
    if (dest_index + count > dest_size) { \
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        av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: next op would overflow dest_index\n"); \
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        av_log(NULL, AV_LOG_ERROR, "  VQA video: current dest_index = %d, count = %d, dest_size = %d\n", \
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            dest_index, count, dest_size); \
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        return; \
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    }
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206
static void decode_format80(unsigned char *src, int src_size,
207
    unsigned char *dest, int dest_size, int check_size) {
208

    
209
    int src_index = 0;
210
    int dest_index = 0;
211
    int count;
212
    int src_pos;
213
    unsigned char color;
214
    int i;
215

    
216
    while (src_index < src_size) {
217

    
218
        vqa_debug("      opcode %02X: ", src[src_index]);
219

    
220
        /* 0x80 means that frame is finished */
221
        if (src[src_index] == 0x80)
222
            return;
223

    
224
        if (dest_index >= dest_size) {
225
            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
226
                dest_index, dest_size);
227
            return;
228
        }
229

    
230
        if (src[src_index] == 0xFF) {
231

    
232
            src_index++;
233
            count = AV_RL16(&src[src_index]);
234
            src_index += 2;
235
            src_pos = AV_RL16(&src[src_index]);
236
            src_index += 2;
237
            vqa_debug("(1) copy %X bytes from absolute pos %X\n", count, src_pos);
238
            CHECK_COUNT();
239
            for (i = 0; i < count; i++)
240
                dest[dest_index + i] = dest[src_pos + i];
241
            dest_index += count;
242

    
243
        } else if (src[src_index] == 0xFE) {
244

    
245
            src_index++;
246
            count = AV_RL16(&src[src_index]);
247
            src_index += 2;
248
            color = src[src_index++];
249
            vqa_debug("(2) set %X bytes to %02X\n", count, color);
250
            CHECK_COUNT();
251
            memset(&dest[dest_index], color, count);
252
            dest_index += count;
253

    
254
        } else if ((src[src_index] & 0xC0) == 0xC0) {
255

    
256
            count = (src[src_index++] & 0x3F) + 3;
257
            src_pos = AV_RL16(&src[src_index]);
258
            src_index += 2;
259
            vqa_debug("(3) copy %X bytes from absolute pos %X\n", count, src_pos);
260
            CHECK_COUNT();
261
            for (i = 0; i < count; i++)
262
                dest[dest_index + i] = dest[src_pos + i];
263
            dest_index += count;
264

    
265
        } else if (src[src_index] > 0x80) {
266

    
267
            count = src[src_index++] & 0x3F;
268
            vqa_debug("(4) copy %X bytes from source to dest\n", count);
269
            CHECK_COUNT();
270
            memcpy(&dest[dest_index], &src[src_index], count);
271
            src_index += count;
272
            dest_index += count;
273

    
274
        } else {
275

    
276
            count = ((src[src_index] & 0x70) >> 4) + 3;
277
            src_pos = AV_RB16(&src[src_index]) & 0x0FFF;
278
            src_index += 2;
279
            vqa_debug("(5) copy %X bytes from relpos %X\n", count, src_pos);
280
            CHECK_COUNT();
281
            for (i = 0; i < count; i++)
282
                dest[dest_index + i] = dest[dest_index - src_pos + i];
283
            dest_index += count;
284
        }
285
    }
286

    
287
    /* validate that the entire destination buffer was filled; this is
288
     * important for decoding frame maps since each vector needs to have a
289
     * codebook entry; it is not important for compressed codebooks because
290
     * not every entry needs to be filled */
291
    if (check_size)
292
        if (dest_index < dest_size)
293
            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
294
                dest_index, dest_size);
295
}
296

    
297
static void vqa_decode_chunk(VqaContext *s)
298
{
299
    unsigned int chunk_type;
300
    unsigned int chunk_size;
301
    int byte_skip;
302
    unsigned int index = 0;
303
    int i;
304
    unsigned char r, g, b;
305
    int index_shift;
306

    
307
    int cbf0_chunk = -1;
308
    int cbfz_chunk = -1;
309
    int cbp0_chunk = -1;
310
    int cbpz_chunk = -1;
311
    int cpl0_chunk = -1;
312
    int cplz_chunk = -1;
313
    int vptz_chunk = -1;
314

    
315
    int x, y;
316
    int lines = 0;
317
    int pixel_ptr;
318
    int vector_index = 0;
319
    int lobyte = 0;
320
    int hibyte = 0;
321
    int lobytes = 0;
322
    int hibytes = s->decode_buffer_size / 2;
323

    
324
    /* first, traverse through the frame and find the subchunks */
325
    while (index < s->size) {
326

    
327
        chunk_type = AV_RB32(&s->buf[index]);
328
        chunk_size = AV_RB32(&s->buf[index + 4]);
329

    
330
        switch (chunk_type) {
331

    
332
        case CBF0_TAG:
333
            cbf0_chunk = index;
334
            break;
335

    
336
        case CBFZ_TAG:
337
            cbfz_chunk = index;
338
            break;
339

    
340
        case CBP0_TAG:
341
            cbp0_chunk = index;
342
            break;
343

    
344
        case CBPZ_TAG:
345
            cbpz_chunk = index;
346
            break;
347

    
348
        case CPL0_TAG:
349
            cpl0_chunk = index;
350
            break;
351

    
352
        case CPLZ_TAG:
353
            cplz_chunk = index;
354
            break;
355

    
356
        case VPTZ_TAG:
357
            vptz_chunk = index;
358
            break;
359

    
360
        default:
361
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
362
            (chunk_type >> 24) & 0xFF,
363
            (chunk_type >> 16) & 0xFF,
364
            (chunk_type >>  8) & 0xFF,
365
            (chunk_type >>  0) & 0xFF,
366
            chunk_type);
367
            break;
368
        }
369

    
370
        byte_skip = chunk_size & 0x01;
371
        index += (CHUNK_PREAMBLE_SIZE + chunk_size + byte_skip);
372
    }
373

    
374
    /* next, deal with the palette */
375
    if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
376

    
377
        /* a chunk should not have both chunk types */
378
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
379
        return;
380
    }
381

    
382
    /* decompress the palette chunk */
383
    if (cplz_chunk != -1) {
384

    
385
/* yet to be handled */
386

    
387
    }
388

    
389
    /* convert the RGB palette into the machine's endian format */
390
    if (cpl0_chunk != -1) {
391

    
392
        chunk_size = AV_RB32(&s->buf[cpl0_chunk + 4]);
393
        /* sanity check the palette size */
394
        if (chunk_size / 3 > 256) {
395
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
396
                chunk_size / 3);
397
            return;
398
        }
399
        cpl0_chunk += CHUNK_PREAMBLE_SIZE;
400
        for (i = 0; i < chunk_size / 3; i++) {
401
            /* scale by 4 to transform 6-bit palette -> 8-bit */
402
            r = s->buf[cpl0_chunk++] * 4;
403
            g = s->buf[cpl0_chunk++] * 4;
404
            b = s->buf[cpl0_chunk++] * 4;
405
            s->palette[i] = (r << 16) | (g << 8) | (b);
406
        }
407
    }
408

    
409
    /* next, look for a full codebook */
410
    if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
411

    
412
        /* a chunk should not have both chunk types */
413
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
414
        return;
415
    }
416

    
417
    /* decompress the full codebook chunk */
418
    if (cbfz_chunk != -1) {
419

    
420
        chunk_size = AV_RB32(&s->buf[cbfz_chunk + 4]);
421
        cbfz_chunk += CHUNK_PREAMBLE_SIZE;
422
        decode_format80(&s->buf[cbfz_chunk], chunk_size,
423
            s->codebook, s->codebook_size, 0);
424
    }
425

    
426
    /* copy a full codebook */
427
    if (cbf0_chunk != -1) {
428

    
429
        chunk_size = AV_RB32(&s->buf[cbf0_chunk + 4]);
430
        /* sanity check the full codebook size */
431
        if (chunk_size > MAX_CODEBOOK_SIZE) {
432
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
433
                chunk_size);
434
            return;
435
        }
436
        cbf0_chunk += CHUNK_PREAMBLE_SIZE;
437

    
438
        memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
439
    }
440

    
441
    /* decode the frame */
442
    if (vptz_chunk == -1) {
443

    
444
        /* something is wrong if there is no VPTZ chunk */
445
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
446
        return;
447
    }
448

    
449
    chunk_size = AV_RB32(&s->buf[vptz_chunk + 4]);
450
    vptz_chunk += CHUNK_PREAMBLE_SIZE;
451
    decode_format80(&s->buf[vptz_chunk], chunk_size,
452
        s->decode_buffer, s->decode_buffer_size, 1);
453

    
454
    /* render the final PAL8 frame */
455
    if (s->vector_height == 4)
456
        index_shift = 4;
457
    else
458
        index_shift = 3;
459
    for (y = 0; y < s->frame.linesize[0] * s->height;
460
        y += s->frame.linesize[0] * s->vector_height) {
461

    
462
        for (x = y; x < y + s->width; x += 4, lobytes++, hibytes++) {
463
            pixel_ptr = x;
464

    
465
            /* get the vector index, the method for which varies according to
466
             * VQA file version */
467
            switch (s->vqa_version) {
468

    
469
            case 1:
470
/* still need sample media for this case (only one game, "Legend of
471
 * Kyrandia III : Malcolm's Revenge", is known to use this version) */
472
                lobyte = s->decode_buffer[lobytes * 2];
473
                hibyte = s->decode_buffer[(lobytes * 2) + 1];
474
                vector_index = ((hibyte << 8) | lobyte) >> 3;
475
                vector_index <<= index_shift;
476
                lines = s->vector_height;
477
                /* uniform color fill - a quick hack */
478
                if (hibyte == 0xFF) {
479
                    while (lines--) {
480
                        s->frame.data[0][pixel_ptr + 0] = 255 - lobyte;
481
                        s->frame.data[0][pixel_ptr + 1] = 255 - lobyte;
482
                        s->frame.data[0][pixel_ptr + 2] = 255 - lobyte;
483
                        s->frame.data[0][pixel_ptr + 3] = 255 - lobyte;
484
                        pixel_ptr += s->frame.linesize[0];
485
                    }
486
                    lines=0;
487
                }
488
                break;
489

    
490
            case 2:
491
                lobyte = s->decode_buffer[lobytes];
492
                hibyte = s->decode_buffer[hibytes];
493
                vector_index = (hibyte << 8) | lobyte;
494
                vector_index <<= index_shift;
495
                lines = s->vector_height;
496
                break;
497

    
498
            case 3:
499
/* not implemented yet */
500
                lines = 0;
501
                break;
502
            }
503

    
504
            while (lines--) {
505
                s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
506
                s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
507
                s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
508
                s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
509
                pixel_ptr += s->frame.linesize[0];
510
            }
511
        }
512
    }
513

    
514
    /* handle partial codebook */
515
    if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
516
        /* a chunk should not have both chunk types */
517
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
518
        return;
519
    }
520

    
521
    if (cbp0_chunk != -1) {
522

    
523
        chunk_size = AV_RB32(&s->buf[cbp0_chunk + 4]);
524
        cbp0_chunk += CHUNK_PREAMBLE_SIZE;
525

    
526
        /* accumulate partial codebook */
527
        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
528
            &s->buf[cbp0_chunk], chunk_size);
529
        s->next_codebook_buffer_index += chunk_size;
530

    
531
        s->partial_countdown--;
532
        if (s->partial_countdown == 0) {
533

    
534
            /* time to replace codebook */
535
            memcpy(s->codebook, s->next_codebook_buffer,
536
                s->next_codebook_buffer_index);
537

    
538
            /* reset accounting */
539
            s->next_codebook_buffer_index = 0;
540
            s->partial_countdown = s->partial_count;
541
        }
542
    }
543

    
544
    if (cbpz_chunk != -1) {
545

    
546
        chunk_size = AV_RB32(&s->buf[cbpz_chunk + 4]);
547
        cbpz_chunk += CHUNK_PREAMBLE_SIZE;
548

    
549
        /* accumulate partial codebook */
550
        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
551
            &s->buf[cbpz_chunk], chunk_size);
552
        s->next_codebook_buffer_index += chunk_size;
553

    
554
        s->partial_countdown--;
555
        if (s->partial_countdown == 0) {
556

    
557
            /* decompress codebook */
558
            decode_format80(s->next_codebook_buffer,
559
                s->next_codebook_buffer_index,
560
                s->codebook, s->codebook_size, 0);
561

    
562
            /* reset accounting */
563
            s->next_codebook_buffer_index = 0;
564
            s->partial_countdown = s->partial_count;
565
        }
566
    }
567
}
568

    
569
static int vqa_decode_frame(AVCodecContext *avctx,
570
                            void *data, int *data_size,
571
                            uint8_t *buf, int buf_size)
572
{
573
    VqaContext *s = avctx->priv_data;
574

    
575
    s->buf = buf;
576
    s->size = buf_size;
577

    
578
    if (s->frame.data[0])
579
        avctx->release_buffer(avctx, &s->frame);
580

    
581
    if (avctx->get_buffer(avctx, &s->frame)) {
582
        av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
583
        return -1;
584
    }
585

    
586
    vqa_decode_chunk(s);
587

    
588
    /* make the palette available on the way out */
589
    memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
590
    s->frame.palette_has_changed = 1;
591

    
592
    *data_size = sizeof(AVFrame);
593
    *(AVFrame*)data = s->frame;
594

    
595
    /* report that the buffer was completely consumed */
596
    return buf_size;
597
}
598

    
599
static int vqa_decode_end(AVCodecContext *avctx)
600
{
601
    VqaContext *s = avctx->priv_data;
602

    
603
    av_free(s->codebook);
604
    av_free(s->next_codebook_buffer);
605
    av_free(s->decode_buffer);
606

    
607
    if (s->frame.data[0])
608
        avctx->release_buffer(avctx, &s->frame);
609

    
610
    return 0;
611
}
612

    
613
AVCodec vqa_decoder = {
614
    "vqavideo",
615
    CODEC_TYPE_VIDEO,
616
    CODEC_ID_WS_VQA,
617
    sizeof(VqaContext),
618
    vqa_decode_init,
619
    NULL,
620
    vqa_decode_end,
621
    vqa_decode_frame,
622
    CODEC_CAP_DR1,
623
};