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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 library 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 of the License, or (at your option) any later version.
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 *
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 * This library 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 RPZA format, visit:
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 *   http://www.pcisys.net/~melanson/codecs/
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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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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.h"
73

    
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#define PALETTE_COUNT 256
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#define VQA_HEADER_SIZE 0x2A
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#define CHUNK_PREAMBLE_SIZE 8
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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)
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#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define BE_16(x)  ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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#define BE_32(x)  ((((uint8_t*)(x))[0] << 24) | \
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                   (((uint8_t*)(x))[1] << 16) | \
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                   (((uint8_t*)(x))[2] << 8) | \
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                    ((uint8_t*)(x))[3])
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#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
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        ( (long)(unsigned char)(ch3) | \
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        ( (long)(unsigned char)(ch2) << 8 ) | \
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        ( (long)(unsigned char)(ch1) << 16 ) | \
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        ( (long)(unsigned char)(ch0) << 24 ) )
97

    
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#define CBF0_TAG FOURCC_TAG('C', 'B', 'F', '0')
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#define CBFZ_TAG FOURCC_TAG('C', 'B', 'F', 'Z')
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#define CBP0_TAG FOURCC_TAG('C', 'B', 'P', '0')
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#define CBPZ_TAG FOURCC_TAG('C', 'B', 'P', 'Z')
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#define CPL0_TAG FOURCC_TAG('C', 'P', 'L', '0')
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#define CPLZ_TAG FOURCC_TAG('C', 'P', 'L', 'Z')
104
#define VPTZ_TAG FOURCC_TAG('V', 'P', 'T', 'Z')
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106
#define VQA_DEBUG 0
107

    
108
#if VQA_DEBUG
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#define vqa_debug printf
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#else
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static inline void vqa_debug(const char *format, ...) { }
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#endif
113

    
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typedef struct VqaContext {
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    AVCodecContext *avctx;
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    DSPContext dsp;
118
    AVFrame frame;
119

    
120
    unsigned char *buf;
121
    int size;
122

    
123
    unsigned int palette[PALETTE_COUNT];
124

    
125
    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 */
129
    int vqa_version;  /* this should be either 1, 2 or 3 */
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131
    unsigned char *codebook;         /* the current codebook */
132
    int codebook_size;
133
    unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
134
    int next_codebook_buffer_index;
135

    
136
    unsigned char *decode_buffer;
137
    int decode_buffer_size;
138

    
139
    /* number of frames to go before replacing codebook */
140
    int partial_countdown;
141
    int partial_count;
142

    
143
} VqaContext;
144

    
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static int vqa_decode_init(AVCodecContext *avctx)
146
{
147
    VqaContext *s = (VqaContext *)avctx->priv_data;
148
    unsigned char *vqa_header;
149
    int i, j, codebook_index;;
150

    
151
    s->avctx = avctx;
152
    avctx->pix_fmt = PIX_FMT_PAL8;
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    avctx->has_b_frames = 0;
154
    dsputil_init(&s->dsp, avctx);
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156
    /* make sure the extradata made it */
157
    if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
158
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
159
        return -1;
160
    }
161

    
162
    /* load up the VQA parameters from the header */
163
    vqa_header = (unsigned char *)s->avctx->extradata;
164
    s->vqa_version = vqa_header[0];
165
    s->width = LE_16(&vqa_header[6]);
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    s->height = LE_16(&vqa_header[8]);
167
    s->vector_width = vqa_header[10];
168
    s->vector_height = vqa_header[11];
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    s->partial_count = s->partial_countdown = vqa_header[13];
170

    
171
    /* the vector dimensions have to meet very stringent requirements */
172
    if ((s->vector_width != 4) ||
173
        ((s->vector_height != 2) && (s->vector_height != 4))) {
174
        /* return without further initialization */
175
        return -1;
176
    }
177

    
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    /* allocate codebooks */
179
    s->codebook_size = MAX_CODEBOOK_SIZE;
180
    s->codebook = av_malloc(s->codebook_size);
181
    s->next_codebook_buffer = av_malloc(s->codebook_size);
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    /* initialize the solid-color vectors */
184
    if (s->vector_height == 4) {
185
        codebook_index = 0xFF00 * 16;
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        for (i = 0; i < 256; i++)
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            for (j = 0; j < 16; j++)
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                s->codebook[codebook_index++] = i;
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    } else {
190
        codebook_index = 0xF00 * 8;
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        for (i = 0; i < 256; i++)
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            for (j = 0; j < 8; j++)
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                s->codebook[codebook_index++] = i;
194
    }
195
    s->next_codebook_buffer_index = 0;
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    /* allocate decode buffer */
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    s->decode_buffer_size = (s->width / s->vector_width) *
199
        (s->height / s->vector_height) * 2;
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    s->decode_buffer = av_malloc(s->decode_buffer_size);
201

    
202
    s->frame.data[0] = NULL;
203

    
204
    return 0;
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}
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#define CHECK_COUNT() \
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    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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static void decode_format80(unsigned char *src, int src_size,
216
    unsigned char *dest, int dest_size, int check_size) {
217

    
218
    int src_index = 0;
219
    int dest_index = 0;
220
    int count;
221
    int src_pos;
222
    unsigned char color;
223
    int i;
224

    
225
    while (src_index < src_size) {
226

    
227
        vqa_debug("      opcode %02X: ", src[src_index]);
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229
        /* 0x80 means that frame is finished */
230
        if (src[src_index] == 0x80)
231
            return;
232

    
233
        if (dest_index >= dest_size) {
234
            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
235
                dest_index, dest_size);
236
            return;
237
        }
238

    
239
        if (src[src_index] == 0xFF) {
240

    
241
            src_index++;
242
            count = LE_16(&src[src_index]);
243
            src_index += 2;
244
            src_pos = LE_16(&src[src_index]);
245
            src_index += 2;
246
            vqa_debug("(1) copy %X bytes from absolute pos %X\n", count, src_pos);
247
            CHECK_COUNT();
248
            for (i = 0; i < count; i++)
249
                dest[dest_index + i] = dest[src_pos + i];
250
            dest_index += count;
251

    
252
        } else if (src[src_index] == 0xFE) {
253

    
254
            src_index++;
255
            count = LE_16(&src[src_index]);
256
            src_index += 2;
257
            color = src[src_index++];
258
            vqa_debug("(2) set %X bytes to %02X\n", count, color);
259
            CHECK_COUNT();
260
            memset(&dest[dest_index], color, count);
261
            dest_index += count;
262

    
263
        } else if ((src[src_index] & 0xC0) == 0xC0) {
264

    
265
            count = (src[src_index++] & 0x3F) + 3;
266
            src_pos = LE_16(&src[src_index]);
267
            src_index += 2;
268
            vqa_debug("(3) copy %X bytes from absolute pos %X\n", count, src_pos);
269
            CHECK_COUNT();
270
            for (i = 0; i < count; i++)
271
                dest[dest_index + i] = dest[src_pos + i];
272
            dest_index += count;
273

    
274
        } else if (src[src_index] > 0x80) {
275

    
276
            count = src[src_index++] & 0x3F;
277
            vqa_debug("(4) copy %X bytes from source to dest\n", count);
278
            CHECK_COUNT();
279
            memcpy(&dest[dest_index], &src[src_index], count);
280
            src_index += count;
281
            dest_index += count;
282

    
283
        } else {
284

    
285
            count = ((src[src_index] & 0x70) >> 4) + 3;
286
            src_pos = BE_16(&src[src_index]) & 0x0FFF;
287
            src_index += 2;
288
            vqa_debug("(5) copy %X bytes from relpos %X\n", count, src_pos);
289
            CHECK_COUNT();
290
            for (i = 0; i < count; i++)
291
                dest[dest_index + i] = dest[dest_index - src_pos + i];
292
            dest_index += count;
293
        }
294
    }
295

    
296
    /* validate that the entire destination buffer was filled; this is
297
     * important for decoding frame maps since each vector needs to have a
298
     * codebook entry; it is not important for compressed codebooks because
299
     * not every entry needs to be filled */
300
    if (check_size)
301
        if (dest_index < dest_size)
302
            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
303
                dest_index, dest_size);
304
}
305

    
306
static void vqa_decode_chunk(VqaContext *s)
307
{
308
    unsigned int chunk_type;
309
    unsigned int chunk_size;
310
    int byte_skip;
311
    unsigned int index = 0;
312
    int i;
313
    unsigned char r, g, b;
314
    int index_shift;
315

    
316
    int cbf0_chunk = -1;
317
    int cbfz_chunk = -1;
318
    int cbp0_chunk = -1;
319
    int cbpz_chunk = -1;
320
    int cpl0_chunk = -1;
321
    int cplz_chunk = -1;
322
    int vptz_chunk = -1;
323

    
324
    int x, y;
325
    int lines = 0;
326
    int pixel_ptr;
327
    int vector_index = 0;
328
    int lobyte = 0;
329
    int hibyte = 0;
330
    int lobytes = 0;
331
    int hibytes = s->decode_buffer_size / 2;
332

    
333
    /* first, traverse through the frame and find the subchunks */
334
    while (index < s->size) {
335

    
336
        chunk_type = BE_32(&s->buf[index]);
337
        chunk_size = BE_32(&s->buf[index + 4]);
338

    
339
        switch (chunk_type) {
340

    
341
        case CBF0_TAG:
342
            cbf0_chunk = index;
343
            break;
344

    
345
        case CBFZ_TAG:
346
            cbfz_chunk = index;
347
            break;
348

    
349
        case CBP0_TAG:
350
            cbp0_chunk = index;
351
            break;
352

    
353
        case CBPZ_TAG:
354
            cbpz_chunk = index;
355
            break;
356

    
357
        case CPL0_TAG:
358
            cpl0_chunk = index;
359
            break;
360

    
361
        case CPLZ_TAG:
362
            cplz_chunk = index;
363
            break;
364

    
365
        case VPTZ_TAG:
366
            vptz_chunk = index;
367
            break;
368

    
369
        default:
370
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
371
            (chunk_type >> 24) & 0xFF,
372
            (chunk_type >> 16) & 0xFF,
373
            (chunk_type >>  8) & 0xFF,
374
            (chunk_type >>  0) & 0xFF,
375
            chunk_type);
376
            break;
377
        }
378

    
379
        byte_skip = chunk_size & 0x01;
380
        index += (CHUNK_PREAMBLE_SIZE + chunk_size + byte_skip);
381
    }
382

    
383
    /* next, deal with the palette */
384
    if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
385

    
386
        /* a chunk should not have both chunk types */
387
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
388
        return;
389
    }
390

    
391
    /* decompress the palette chunk */
392
    if (cplz_chunk != -1) {
393

    
394
/* yet to be handled */
395

    
396
    }
397

    
398
    /* convert the RGB palette into the machine's endian format */
399
    if (cpl0_chunk != -1) {
400

    
401
        chunk_size = BE_32(&s->buf[cpl0_chunk + 4]);
402
        /* sanity check the palette size */
403
        if (chunk_size / 3 > 256) {
404
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
405
                chunk_size / 3);
406
            return;
407
        }
408
        cpl0_chunk += CHUNK_PREAMBLE_SIZE;
409
        for (i = 0; i < chunk_size / 3; i++) {
410
            /* scale by 4 to transform 6-bit palette -> 8-bit */
411
            r = s->buf[cpl0_chunk++] * 4;
412
            g = s->buf[cpl0_chunk++] * 4;
413
            b = s->buf[cpl0_chunk++] * 4;
414
            s->palette[i] = (r << 16) | (g << 8) | (b);
415
        }
416
    }
417

    
418
    /* next, look for a full codebook */
419
    if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
420

    
421
        /* a chunk should not have both chunk types */
422
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
423
        return;
424
    }
425

    
426
    /* decompress the full codebook chunk */
427
    if (cbfz_chunk != -1) {
428

    
429
        chunk_size = BE_32(&s->buf[cbfz_chunk + 4]);
430
        cbfz_chunk += CHUNK_PREAMBLE_SIZE;
431
        decode_format80(&s->buf[cbfz_chunk], chunk_size,
432
            s->codebook, s->codebook_size, 0);
433
    }
434

    
435
    /* copy a full codebook */
436
    if (cbf0_chunk != -1) {
437

    
438
        chunk_size = BE_32(&s->buf[cbf0_chunk + 4]);
439
        /* sanity check the full codebook size */
440
        if (chunk_size > MAX_CODEBOOK_SIZE) {
441
            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
442
                chunk_size);
443
            return;
444
        }
445
        cbf0_chunk += CHUNK_PREAMBLE_SIZE;
446

    
447
        memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
448
    }
449

    
450
    /* decode the frame */
451
    if (vptz_chunk == -1) {
452

    
453
        /* something is wrong if there is no VPTZ chunk */
454
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
455
        return;
456
    }
457

    
458
    chunk_size = BE_32(&s->buf[vptz_chunk + 4]);
459
    vptz_chunk += CHUNK_PREAMBLE_SIZE;
460
    decode_format80(&s->buf[vptz_chunk], chunk_size,
461
        s->decode_buffer, s->decode_buffer_size, 1);
462

    
463
    /* render the final PAL8 frame */
464
    if (s->vector_height == 4)
465
        index_shift = 4;
466
    else
467
        index_shift = 3;
468
    for (y = 0; y < s->frame.linesize[0] * s->height; 
469
        y += s->frame.linesize[0] * s->vector_height) {
470

    
471
        for (x = y; x < y + s->width; x += 4, lobytes++, hibytes++) {
472
            pixel_ptr = x;
473

    
474
            /* get the vector index, the method for which varies according to
475
             * VQA file version */
476
            switch (s->vqa_version) {
477

    
478
            case 1:
479
/* still need sample media for this case (only one game, "Legend of 
480
 * Kyrandia III : Malcolm's Revenge", is known to use this version) */
481
                lines = 0;
482
                break;
483

    
484
            case 2:
485
                lobyte = s->decode_buffer[lobytes];
486
                hibyte = s->decode_buffer[hibytes];
487
                vector_index = (hibyte << 8) | lobyte;
488
                vector_index <<= index_shift;
489
                lines = s->vector_height;
490
                break;
491

    
492
            case 3:
493
/* not implemented yet */
494
                lines = 0;
495
                break;
496
            }
497

    
498
            while (lines--) {
499
                s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
500
                s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
501
                s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
502
                s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
503
                pixel_ptr += s->frame.linesize[0];
504
            }
505
        }
506
    }
507

    
508
    /* handle partial codebook */
509
    if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
510
        /* a chunk should not have both chunk types */
511
        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
512
        return;
513
    }
514

    
515
    if (cbp0_chunk != -1) {
516

    
517
        chunk_size = BE_32(&s->buf[cbp0_chunk + 4]);
518
        cbp0_chunk += CHUNK_PREAMBLE_SIZE;
519

    
520
        /* accumulate partial codebook */
521
        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
522
            &s->buf[cbp0_chunk], chunk_size);
523
        s->next_codebook_buffer_index += chunk_size;
524

    
525
        s->partial_countdown--;
526
        if (s->partial_countdown == 0) {
527

    
528
            /* time to replace codebook */
529
            memcpy(s->codebook, s->next_codebook_buffer, 
530
                s->next_codebook_buffer_index);
531

    
532
            /* reset accounting */
533
            s->next_codebook_buffer_index = 0;
534
            s->partial_countdown = s->partial_count;
535
        }
536
    }
537

    
538
    if (cbpz_chunk != -1) {
539

    
540
        chunk_size = BE_32(&s->buf[cbpz_chunk + 4]);
541
        cbpz_chunk += CHUNK_PREAMBLE_SIZE;
542

    
543
        /* accumulate partial codebook */
544
        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
545
            &s->buf[cbpz_chunk], chunk_size);
546
        s->next_codebook_buffer_index += chunk_size;
547

    
548
        s->partial_countdown--;
549
        if (s->partial_countdown == 0) {
550

    
551
            /* decompress codebook */
552
            decode_format80(s->next_codebook_buffer, 
553
                s->next_codebook_buffer_index, 
554
                s->codebook, s->codebook_size, 0);
555

    
556
            /* reset accounting */
557
            s->next_codebook_buffer_index = 0;
558
            s->partial_countdown = s->partial_count;
559
        }
560
    }
561
}
562

    
563
static int vqa_decode_frame(AVCodecContext *avctx,
564
                            void *data, int *data_size,
565
                            uint8_t *buf, int buf_size)
566
{
567
    VqaContext *s = (VqaContext *)avctx->priv_data;
568

    
569
    s->buf = buf;
570
    s->size = buf_size;
571

    
572
    if (s->frame.data[0])
573
        avctx->release_buffer(avctx, &s->frame);
574

    
575
    if (avctx->get_buffer(avctx, &s->frame)) {
576
        av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
577
        return -1;
578
    }
579

    
580
    vqa_decode_chunk(s);
581

    
582
    /* make the palette available on the way out */
583
    memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
584
    s->frame.palette_has_changed = 1;
585

    
586
    *data_size = sizeof(AVFrame);
587
    *(AVFrame*)data = s->frame;
588

    
589
    /* report that the buffer was completely consumed */
590
    return buf_size;
591
}
592

    
593
static int vqa_decode_end(AVCodecContext *avctx)
594
{
595
    VqaContext *s = (VqaContext *)avctx->priv_data;
596

    
597
    av_free(s->codebook);
598
    av_free(s->next_codebook_buffer);
599
    av_free(s->decode_buffer);
600

    
601
    if (s->frame.data[0])
602
        avctx->release_buffer(avctx, &s->frame);
603

    
604
    return 0;
605
}
606

    
607
AVCodec vqa_decoder = {
608
    "vqavideo",
609
    CODEC_TYPE_VIDEO,
610
    CODEC_ID_WS_VQA,
611
    sizeof(VqaContext),
612
    vqa_decode_init,
613
    NULL,
614
    vqa_decode_end,
615
    vqa_decode_frame,
616
    CODEC_CAP_DR1,
617
};