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657 lines
22 KiB
C
Executable File
657 lines
22 KiB
C
Executable File
/*
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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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* @file
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* VQA Video Decoder
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* @author Mike Melanson (melanson@pcisys.net)
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* @see 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 indexes. If the 12-bit indexes 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 "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#define PALETTE_COUNT 256
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#define VQA_HEADER_SIZE 0x2A
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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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typedef struct VqaContext {
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AVCodecContext *avctx;
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GetByteContext gb;
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uint32_t 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 av_cold int vqa_decode_init(AVCodecContext *avctx)
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{
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VqaContext *s = avctx->priv_data;
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int i, j, codebook_index, ret;
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s->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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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, "expected extradata size of %d\n", VQA_HEADER_SIZE);
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return AVERROR(EINVAL);
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}
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/* load up the VQA parameters from the header */
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s->vqa_version = s->avctx->extradata[0];
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switch (s->vqa_version) {
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case 1:
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case 2:
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break;
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case 3:
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avpriv_report_missing_feature(avctx, "VQA Version %d", s->vqa_version);
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return AVERROR_PATCHWELCOME;
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default:
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avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version);
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return AVERROR_PATCHWELCOME;
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}
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s->width = AV_RL16(&s->avctx->extradata[6]);
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s->height = AV_RL16(&s->avctx->extradata[8]);
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if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 0) {
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s->width= s->height= 0;
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return ret;
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}
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s->vector_width = s->avctx->extradata[10];
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s->vector_height = s->avctx->extradata[11];
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s->partial_count = s->partial_countdown = s->avctx->extradata[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 AVERROR_INVALIDDATA;
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}
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if (s->width % s->vector_width || s->height % s->vector_height) {
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av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
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return AVERROR_INVALIDDATA;
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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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if (!s->codebook)
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goto fail;
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s->next_codebook_buffer = av_malloc(s->codebook_size);
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if (!s->next_codebook_buffer)
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goto fail;
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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_mallocz(s->decode_buffer_size);
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if (!s->decode_buffer)
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goto fail;
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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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return 0;
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fail:
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av_freep(&s->codebook);
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av_freep(&s->next_codebook_buffer);
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av_freep(&s->decode_buffer);
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return AVERROR(ENOMEM);
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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(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
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av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \
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dest_index, count, dest_size); \
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return AVERROR_INVALIDDATA; \
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}
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#define CHECK_COPY(idx) \
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if (idx < 0 || idx + count > dest_size) { \
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
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av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \
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src_pos, count, dest_size); \
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return AVERROR_INVALIDDATA; \
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}
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static int decode_format80(VqaContext *s, int src_size,
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unsigned char *dest, int dest_size, int check_size) {
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int dest_index = 0;
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int count, opcode, start;
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int src_pos;
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unsigned char color;
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int i;
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if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) {
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av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n",
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src_size);
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return AVERROR_INVALIDDATA;
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}
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start = bytestream2_tell(&s->gb);
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while (bytestream2_tell(&s->gb) - start < src_size) {
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opcode = bytestream2_get_byte(&s->gb);
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ff_tlog(s->avctx, "opcode %02X: ", opcode);
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/* 0x80 means that frame is finished */
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if (opcode == 0x80)
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break;
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if (dest_index >= dest_size) {
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
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dest_index, dest_size);
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return AVERROR_INVALIDDATA;
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}
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if (opcode == 0xFF) {
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count = bytestream2_get_le16(&s->gb);
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src_pos = bytestream2_get_le16(&s->gb);
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ff_tlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
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CHECK_COUNT();
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CHECK_COPY(src_pos);
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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 (opcode == 0xFE) {
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count = bytestream2_get_le16(&s->gb);
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color = bytestream2_get_byte(&s->gb);
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ff_tlog(s->avctx, "(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 ((opcode & 0xC0) == 0xC0) {
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count = (opcode & 0x3F) + 3;
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src_pos = bytestream2_get_le16(&s->gb);
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ff_tlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
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CHECK_COUNT();
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CHECK_COPY(src_pos);
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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 (opcode > 0x80) {
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count = opcode & 0x3F;
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ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
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CHECK_COUNT();
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bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
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dest_index += count;
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} else {
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count = ((opcode & 0x70) >> 4) + 3;
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src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
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ff_tlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
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CHECK_COUNT();
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CHECK_COPY(dest_index - src_pos);
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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(s->avctx, AV_LOG_ERROR, "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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memset(dest + dest_index, 0, dest_size - dest_index);
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}
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return 0; // let's display what we decoded anyway
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}
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static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
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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 res;
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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 (bytestream2_get_bytes_left(&s->gb) >= 8) {
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chunk_type = bytestream2_get_be32u(&s->gb);
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index = bytestream2_tell(&s->gb);
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chunk_size = bytestream2_get_be32u(&s->gb);
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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, "Found unknown chunk type: %s (%08X)\n",
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av_fourcc2str(av_bswap32(chunk_type)), chunk_type);
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break;
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}
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byte_skip = chunk_size & 0x01;
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bytestream2_skip(&s->gb, 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, "problem: found both CPL0 and CPLZ chunks\n");
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return AVERROR_INVALIDDATA;
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}
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/* decompress the palette chunk */
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if (cplz_chunk != -1) {
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/* yet to be handled */
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}
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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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bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
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chunk_size = bytestream2_get_be32(&s->gb);
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/* sanity check the palette size */
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if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
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av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
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chunk_size / 3);
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return AVERROR_INVALIDDATA;
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}
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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 = bytestream2_get_byteu(&s->gb) * 4;
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g = bytestream2_get_byteu(&s->gb) * 4;
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b = bytestream2_get_byteu(&s->gb) * 4;
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s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
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s->palette[i] |= s->palette[i] >> 6 & 0x30303;
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}
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}
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/* next, look for a full codebook */
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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, "problem: found both CBF0 and CBFZ chunks\n");
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return AVERROR_INVALIDDATA;
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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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bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
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chunk_size = bytestream2_get_be32(&s->gb);
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if ((res = decode_format80(s, chunk_size, s->codebook,
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s->codebook_size, 0)) < 0)
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return res;
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}
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/* copy a full codebook */
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if (cbf0_chunk != -1) {
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bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
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chunk_size = bytestream2_get_be32(&s->gb);
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/* 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, "problem: CBF0 chunk too large (0x%X bytes)\n",
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chunk_size);
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return AVERROR_INVALIDDATA;
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}
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bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
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}
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/* decode the frame */
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if (vptz_chunk == -1) {
|
|
|
|
/* something is wrong if there is no VPTZ chunk */
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
|
|
chunk_size = bytestream2_get_be32(&s->gb);
|
|
if ((res = decode_format80(s, chunk_size,
|
|
s->decode_buffer, s->decode_buffer_size, 1)) < 0)
|
|
return res;
|
|
|
|
/* render the final PAL8 frame */
|
|
if (s->vector_height == 4)
|
|
index_shift = 4;
|
|
else
|
|
index_shift = 3;
|
|
for (y = 0; y < s->height; y += s->vector_height) {
|
|
for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
|
|
pixel_ptr = y * frame->linesize[0] + x;
|
|
|
|
/* get the vector index, the method for which varies according to
|
|
* VQA file version */
|
|
switch (s->vqa_version) {
|
|
|
|
case 1:
|
|
lobyte = s->decode_buffer[lobytes * 2];
|
|
hibyte = s->decode_buffer[(lobytes * 2) + 1];
|
|
vector_index = ((hibyte << 8) | lobyte) >> 3;
|
|
vector_index <<= index_shift;
|
|
lines = s->vector_height;
|
|
/* uniform color fill - a quick hack */
|
|
if (hibyte == 0xFF) {
|
|
while (lines--) {
|
|
frame->data[0][pixel_ptr + 0] = 255 - lobyte;
|
|
frame->data[0][pixel_ptr + 1] = 255 - lobyte;
|
|
frame->data[0][pixel_ptr + 2] = 255 - lobyte;
|
|
frame->data[0][pixel_ptr + 3] = 255 - lobyte;
|
|
pixel_ptr += frame->linesize[0];
|
|
}
|
|
lines=0;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
lobyte = s->decode_buffer[lobytes];
|
|
hibyte = s->decode_buffer[hibytes];
|
|
vector_index = (hibyte << 8) | lobyte;
|
|
vector_index <<= index_shift;
|
|
lines = s->vector_height;
|
|
break;
|
|
|
|
case 3:
|
|
/* not implemented yet */
|
|
lines = 0;
|
|
break;
|
|
}
|
|
|
|
while (lines--) {
|
|
frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
|
|
frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
|
|
frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
|
|
frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
|
|
pixel_ptr += frame->linesize[0];
|
|
}
|
|
}
|
|
}
|
|
|
|
/* handle partial codebook */
|
|
if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
|
|
/* a chunk should not have both chunk types */
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (cbp0_chunk != -1) {
|
|
|
|
bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
|
|
chunk_size = bytestream2_get_be32(&s->gb);
|
|
|
|
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
|
|
chunk_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* accumulate partial codebook */
|
|
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
|
|
chunk_size);
|
|
s->next_codebook_buffer_index += chunk_size;
|
|
|
|
s->partial_countdown--;
|
|
if (s->partial_countdown <= 0) {
|
|
|
|
/* time to replace codebook */
|
|
memcpy(s->codebook, s->next_codebook_buffer,
|
|
s->next_codebook_buffer_index);
|
|
|
|
/* reset accounting */
|
|
s->next_codebook_buffer_index = 0;
|
|
s->partial_countdown = s->partial_count;
|
|
}
|
|
}
|
|
|
|
if (cbpz_chunk != -1) {
|
|
|
|
bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
|
|
chunk_size = bytestream2_get_be32(&s->gb);
|
|
|
|
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
|
|
chunk_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* accumulate partial codebook */
|
|
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
|
|
chunk_size);
|
|
s->next_codebook_buffer_index += chunk_size;
|
|
|
|
s->partial_countdown--;
|
|
if (s->partial_countdown <= 0) {
|
|
bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
|
|
/* decompress codebook */
|
|
if ((res = decode_format80(s, s->next_codebook_buffer_index,
|
|
s->codebook, s->codebook_size, 0)) < 0)
|
|
return res;
|
|
|
|
/* reset accounting */
|
|
s->next_codebook_buffer_index = 0;
|
|
s->partial_countdown = s->partial_count;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vqa_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
VqaContext *s = avctx->priv_data;
|
|
AVFrame *frame = data;
|
|
int res;
|
|
|
|
if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return res;
|
|
|
|
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
|
|
if ((res = vqa_decode_chunk(s, frame)) < 0)
|
|
return res;
|
|
|
|
/* make the palette available on the way out */
|
|
memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
|
|
frame->palette_has_changed = 1;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* report that the buffer was completely consumed */
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int vqa_decode_end(AVCodecContext *avctx)
|
|
{
|
|
VqaContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->codebook);
|
|
av_freep(&s->next_codebook_buffer);
|
|
av_freep(&s->decode_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const AVCodecDefault vqa_defaults[] = {
|
|
{ "max_pixels", "320*240" },
|
|
{ NULL },
|
|
};
|
|
|
|
AVCodec ff_vqa_decoder = {
|
|
.name = "vqavideo",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_WS_VQA,
|
|
.priv_data_size = sizeof(VqaContext),
|
|
.init = vqa_decode_init,
|
|
.close = vqa_decode_end,
|
|
.decode = vqa_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.defaults = vqa_defaults,
|
|
};
|