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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"
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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 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')
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#define VQA_DEBUG 0
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#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
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typedef struct VqaContext {
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    AVCodecContext *avctx;
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    DSPContext dsp;
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    AVFrame frame;
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    unsigned char *buf;
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    int size;
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    unsigned int palette[PALETTE_COUNT];
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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 */
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    unsigned char *codebook;         /* the current codebook */
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    int codebook_size;
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    unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
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    int next_codebook_buffer_index;
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    unsigned char *decode_buffer;
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    int decode_buffer_size;
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    /* number of frames to go before replacing codebook */
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    int partial_countdown;
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    int partial_count;
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} VqaContext;
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static int vqa_decode_init(AVCodecContext *avctx)
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{
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    VqaContext *s = (VqaContext *)avctx->priv_data;
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    unsigned char *vqa_header;
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    int i, j, codebook_index;;
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    s->avctx = avctx;
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    avctx->pix_fmt = PIX_FMT_PAL8;
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    avctx->has_b_frames = 0;
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    dsputil_init(&s->dsp, avctx);
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    /* make sure the extradata made it */
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    if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
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        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: expected extradata size of %d\n", VQA_HEADER_SIZE);
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        return -1;
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    }
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    /* load up the VQA parameters from the header */
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    vqa_header = (unsigned char *)s->avctx->extradata;
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    s->vqa_version = vqa_header[0];
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    s->width = LE_16(&vqa_header[6]);
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    s->height = LE_16(&vqa_header[8]);
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    s->vector_width = vqa_header[10];
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    s->vector_height = vqa_header[11];
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    s->partial_count = s->partial_countdown = vqa_header[13];
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    /* the vector dimensions have to meet very stringent requirements */
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    if ((s->vector_width != 4) ||
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        ((s->vector_height != 2) && (s->vector_height != 4))) {
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        /* return without further initialization */
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        return -1;
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    }
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    /* allocate codebooks */
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    s->codebook_size = MAX_CODEBOOK_SIZE;
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    s->codebook = av_malloc(s->codebook_size);
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    s->next_codebook_buffer = av_malloc(s->codebook_size);
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    /* initialize the solid-color vectors */
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    if (s->vector_height == 4) {
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        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 {
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        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;
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    }
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    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) *
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        (s->height / s->vector_height) * 2;
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    s->decode_buffer = av_malloc(s->decode_buffer_size);
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    s->frame.data[0] = NULL;
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    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,
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    unsigned char *dest, int dest_size, int check_size) {
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    int src_index = 0;
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    int dest_index = 0;
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    int count;
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    int src_pos;
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    unsigned char color;
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    int i;
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    while (src_index < src_size) {
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        vqa_debug("      opcode %02X: ", src[src_index]);
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        /* 0x80 means that frame is finished */
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        if (src[src_index] == 0x80)
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            return;
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        if (dest_index >= dest_size) {
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            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
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                dest_index, dest_size);
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            return;
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        }
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        if (src[src_index] == 0xFF) {
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            src_index++;
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            count = LE_16(&src[src_index]);
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            src_index += 2;
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            src_pos = LE_16(&src[src_index]);
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            src_index += 2;
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            vqa_debug("(1) copy %X bytes from absolute pos %X\n", count, src_pos);
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            CHECK_COUNT();
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            for (i = 0; i < count; i++)
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                dest[dest_index + i] = dest[src_pos + i];
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            dest_index += count;
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        } else if (src[src_index] == 0xFE) {
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            src_index++;
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            count = LE_16(&src[src_index]);
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            src_index += 2;
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            color = src[src_index++];
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            vqa_debug("(2) set %X bytes to %02X\n", count, color);
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            CHECK_COUNT();
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            memset(&dest[dest_index], color, count);
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            dest_index += count;
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        } else if ((src[src_index] & 0xC0) == 0xC0) {
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            count = (src[src_index++] & 0x3F) + 3;
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            src_pos = LE_16(&src[src_index]);
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            src_index += 2;
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            vqa_debug("(3) copy %X bytes from absolute pos %X\n", count, src_pos);
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            CHECK_COUNT();
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            for (i = 0; i < count; i++)
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                dest[dest_index + i] = dest[src_pos + i];
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            dest_index += count;
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        } else if (src[src_index] > 0x80) {
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            count = src[src_index++] & 0x3F;
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            vqa_debug("(4) copy %X bytes from source to dest\n", count);
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            CHECK_COUNT();
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            memcpy(&dest[dest_index], &src[src_index], count);
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            src_index += count;
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            dest_index += count;
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        } else {
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            count = ((src[src_index] & 0x70) >> 4) + 3;
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            src_pos = BE_16(&src[src_index]) & 0x0FFF;
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            src_index += 2;
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            vqa_debug("(5) copy %X bytes from relpos %X\n", count, src_pos);
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            CHECK_COUNT();
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            for (i = 0; i < count; i++)
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                dest[dest_index + i] = dest[dest_index - src_pos + i];
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            dest_index += count;
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        }
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    }
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    /* validate that the entire destination buffer was filled; this is
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     * important for decoding frame maps since each vector needs to have a
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     * codebook entry; it is not important for compressed codebooks because
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     * not every entry needs to be filled */
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    if (check_size)
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        if (dest_index < dest_size)
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            av_log(NULL, AV_LOG_ERROR, "  VQA video: decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
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                dest_index, dest_size);
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}
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static void vqa_decode_chunk(VqaContext *s)
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{
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    unsigned int chunk_type;
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    unsigned int chunk_size;
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    int byte_skip;
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    unsigned int index = 0;
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    int i;
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    unsigned char r, g, b;
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    int index_shift;
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    int cbf0_chunk = -1;
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    int cbfz_chunk = -1;
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    int cbp0_chunk = -1;
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    int cbpz_chunk = -1;
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    int cpl0_chunk = -1;
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    int cplz_chunk = -1;
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    int vptz_chunk = -1;
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    int x, y;
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    int lines = 0;
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    int pixel_ptr;
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    int vector_index = 0;
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    int lobyte = 0;
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    int hibyte = 0;
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    int lobytes = 0;
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    int hibytes = s->decode_buffer_size / 2;
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    /* first, traverse through the frame and find the subchunks */
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    while (index < s->size) {
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        chunk_type = BE_32(&s->buf[index]);
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        chunk_size = BE_32(&s->buf[index + 4]);
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        switch (chunk_type) {
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        case CBF0_TAG:
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            cbf0_chunk = index;
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            break;
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        case CBFZ_TAG:
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            cbfz_chunk = index;
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            break;
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        case CBP0_TAG:
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            cbp0_chunk = index;
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            break;
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        case CBPZ_TAG:
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            cbpz_chunk = index;
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            break;
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        case CPL0_TAG:
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            cpl0_chunk = index;
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            break;
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        case CPLZ_TAG:
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            cplz_chunk = index;
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            break;
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        case VPTZ_TAG:
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            vptz_chunk = index;
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            break;
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        default:
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            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: Found unknown chunk type: %c%c%c%c (%08X)\n",
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            (chunk_type >> 24) & 0xFF,
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            (chunk_type >> 16) & 0xFF,
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            (chunk_type >>  8) & 0xFF,
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            (chunk_type >>  0) & 0xFF,
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            chunk_type);
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            break;
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        }
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        byte_skip = chunk_size & 0x01;
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        index += (CHUNK_PREAMBLE_SIZE + chunk_size + byte_skip);
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    }
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    /* next, deal with the palette */
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    if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
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        /* a chunk should not have both chunk types */
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        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CPL0 and CPLZ chunks\n");
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        return;
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    }
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    /* decompress the palette chunk */
379
    if (cplz_chunk != -1) {
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/* yet to be handled */
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    }
384
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    /* convert the RGB palette into the machine's endian format */
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    if (cpl0_chunk != -1) {
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        chunk_size = BE_32(&s->buf[cpl0_chunk + 4]);
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        /* sanity check the palette size */
390
        if (chunk_size / 3 > 256) {
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            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found a palette chunk with %d colors\n",
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                chunk_size / 3);
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            return;
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        }
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        cpl0_chunk += CHUNK_PREAMBLE_SIZE;
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        for (i = 0; i < chunk_size / 3; i++) {
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            /* scale by 4 to transform 6-bit palette -> 8-bit */
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            r = s->buf[cpl0_chunk++] * 4;
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            g = s->buf[cpl0_chunk++] * 4;
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            b = s->buf[cpl0_chunk++] * 4;
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            s->palette[i] = (r << 16) | (g << 8) | (b);
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        }
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    }
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    /* next, look for a full codebook */
406
    if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
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        /* a chunk should not have both chunk types */
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        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBF0 and CBFZ chunks\n");
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        return;
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    }
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    /* decompress the full codebook chunk */
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    if (cbfz_chunk != -1) {
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        chunk_size = BE_32(&s->buf[cbfz_chunk + 4]);
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        cbfz_chunk += CHUNK_PREAMBLE_SIZE;
418
        decode_format80(&s->buf[cbfz_chunk], chunk_size,
419
            s->codebook, s->codebook_size, 0);
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    }
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    /* copy a full codebook */
423
    if (cbf0_chunk != -1) {
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        chunk_size = BE_32(&s->buf[cbf0_chunk + 4]);
426
        /* sanity check the full codebook size */
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        if (chunk_size > MAX_CODEBOOK_SIZE) {
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            av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: CBF0 chunk too large (0x%X bytes)\n",
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                chunk_size);
430
            return;
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        }
432
        cbf0_chunk += CHUNK_PREAMBLE_SIZE;
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        memcpy(s->codebook, &s->buf[cbf0_chunk], chunk_size);
435
    }
436
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    /* decode the frame */
438
    if (vptz_chunk == -1) {
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        /* something is wrong if there is no VPTZ chunk */
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        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: no VPTZ chunk found\n");
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        return;
443
    }
444
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    chunk_size = BE_32(&s->buf[vptz_chunk + 4]);
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    vptz_chunk += CHUNK_PREAMBLE_SIZE;
447
    decode_format80(&s->buf[vptz_chunk], chunk_size,
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        s->decode_buffer, s->decode_buffer_size, 1);
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450
    /* render the final PAL8 frame */
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    if (s->vector_height == 4)
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        index_shift = 4;
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    else
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        index_shift = 3;
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    for (y = 0; y < s->frame.linesize[0] * s->height; 
456
        y += s->frame.linesize[0] * s->vector_height) {
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        for (x = y; x < y + s->width; x += 4, lobytes++, hibytes++) {
459
            pixel_ptr = x;
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461
            /* get the vector index, the method for which varies according to
462
             * VQA file version */
463
            switch (s->vqa_version) {
464
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            case 1:
466
/* still need sample media for this case (only one game, "Legend of 
467
 * Kyrandia III : Malcolm's Revenge", is known to use this version) */
468
                lines = 0;
469
                break;
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            case 2:
472
                lobyte = s->decode_buffer[lobytes];
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                hibyte = s->decode_buffer[hibytes];
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                vector_index = (hibyte << 8) | lobyte;
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                vector_index <<= index_shift;
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                lines = s->vector_height;
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                break;
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            case 3:
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/* not implemented yet */
481
                lines = 0;
482
                break;
483
            }
484
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            while (lines--) {
486
                s->frame.data[0][pixel_ptr + 0] = s->codebook[vector_index++];
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                s->frame.data[0][pixel_ptr + 1] = s->codebook[vector_index++];
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                s->frame.data[0][pixel_ptr + 2] = s->codebook[vector_index++];
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                s->frame.data[0][pixel_ptr + 3] = s->codebook[vector_index++];
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                pixel_ptr += s->frame.linesize[0];
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            }
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        }
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    }
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    /* handle partial codebook */
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    if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
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        /* a chunk should not have both chunk types */
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        av_log(s->avctx, AV_LOG_ERROR, "  VQA video: problem: found both CBP0 and CBPZ chunks\n");
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        return;
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    }
501
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    if (cbp0_chunk != -1) {
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        chunk_size = BE_32(&s->buf[cbp0_chunk + 4]);
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        cbp0_chunk += CHUNK_PREAMBLE_SIZE;
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        /* accumulate partial codebook */
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        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
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            &s->buf[cbp0_chunk], chunk_size);
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        s->next_codebook_buffer_index += chunk_size;
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        s->partial_countdown--;
513
        if (s->partial_countdown == 0) {
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            /* time to replace codebook */
516
            memcpy(s->codebook, s->next_codebook_buffer, 
517
                s->next_codebook_buffer_index);
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            /* reset accounting */
520
            s->next_codebook_buffer_index = 0;
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            s->partial_countdown = s->partial_count;
522
        }
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    }
524
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    if (cbpz_chunk != -1) {
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        chunk_size = BE_32(&s->buf[cbpz_chunk + 4]);
528
        cbpz_chunk += CHUNK_PREAMBLE_SIZE;
529 6955a882 Mike Melanson
530 cafa66af Mike Melanson
        /* accumulate partial codebook */
531
        memcpy(&s->next_codebook_buffer[s->next_codebook_buffer_index],
532
            &s->buf[cbpz_chunk], chunk_size);
533
        s->next_codebook_buffer_index += chunk_size;
534
535
        s->partial_countdown--;
536
        if (s->partial_countdown == 0) {
537
538
            /* decompress codebook */
539
            decode_format80(s->next_codebook_buffer, 
540
                s->next_codebook_buffer_index, 
541
                s->codebook, s->codebook_size, 0);
542
543
            /* reset accounting */
544
            s->next_codebook_buffer_index = 0;
545
            s->partial_countdown = s->partial_count;
546
        }
547 6955a882 Mike Melanson
    }
548
}
549
550
static int vqa_decode_frame(AVCodecContext *avctx,
551
                            void *data, int *data_size,
552
                            uint8_t *buf, int buf_size)
553
{
554
    VqaContext *s = (VqaContext *)avctx->priv_data;
555
556
    s->buf = buf;
557
    s->size = buf_size;
558
559
    if (s->frame.data[0])
560
        avctx->release_buffer(avctx, &s->frame);
561
562
    if (avctx->get_buffer(avctx, &s->frame)) {
563 9b879566 Michel Bardiaux
        av_log(s->avctx, AV_LOG_ERROR, "  VQA Video: get_buffer() failed\n");
564 6955a882 Mike Melanson
        return -1;
565
    }
566
567
    vqa_decode_chunk(s);
568
569
    /* make the palette available on the way out */
570
    memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
571 2a2bbcb0 Mike Melanson
    s->frame.palette_has_changed = 1;
572 6955a882 Mike Melanson
573
    *data_size = sizeof(AVFrame);
574
    *(AVFrame*)data = s->frame;
575
576
    /* report that the buffer was completely consumed */
577
    return buf_size;
578
}
579
580
static int vqa_decode_end(AVCodecContext *avctx)
581
{
582
    VqaContext *s = (VqaContext *)avctx->priv_data;
583
584
    av_free(s->codebook);
585
    av_free(s->next_codebook_buffer);
586
    av_free(s->decode_buffer);
587
588
    if (s->frame.data[0])
589
        avctx->release_buffer(avctx, &s->frame);
590
591
    return 0;
592
}
593
594
AVCodec vqa_decoder = {
595
    "vqavideo",
596
    CODEC_TYPE_VIDEO,
597
    CODEC_ID_WS_VQA,
598
    sizeof(VqaContext),
599
    vqa_decode_init,
600
    NULL,
601
    vqa_decode_end,
602
    vqa_decode_frame,
603
    CODEC_CAP_DR1,
604
};