1
by Sérgio Benjamim
FFmpeg 2.7.1 source for ppsspp. |
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/*
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* Westwood Studios VQA Video Decoder
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* Copyright (c) 2003 The FFmpeg Project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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||
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/**
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* @file
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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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70 |
#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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76 |
#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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86 |
#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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93 |
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94 |
typedef struct VqaContext { |
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96 |
AVCodecContext *avctx; |
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GetByteContext gb; |
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98 |
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99 |
uint32_t palette[PALETTE_COUNT]; |
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100 |
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101 |
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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107 |
unsigned char *codebook; /* the current codebook */ |
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108 |
int codebook_size; |
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109 |
unsigned char *next_codebook_buffer; /* accumulator for next codebook */ |
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110 |
int next_codebook_buffer_index; |
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111 |
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112 |
unsigned char *decode_buffer; |
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113 |
int decode_buffer_size; |
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114 |
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115 |
/* number of frames to go before replacing codebook */
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116 |
int partial_countdown; |
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117 |
int partial_count; |
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118 |
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119 |
} VqaContext; |
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120 |
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121 |
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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124 |
int i, j, codebook_index, ret; |
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125 |
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126 |
s->avctx = avctx; |
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avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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128 |
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129 |
/* 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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135 |
/* 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 = av_image_check_size(s->width, s->height, 0, avctx)) < 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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158 |
/* 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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161 |
/* return without further initialization */
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return AVERROR_INVALIDDATA; |
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163 |
}
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165 |
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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176 |
if (!s->next_codebook_buffer) |
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goto fail; |
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179 |
/* 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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223 |
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224 |
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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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227 |
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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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233 |
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234 |
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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238 |
}
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239 |
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240 |
start = bytestream2_tell(&s->gb); |
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241 |
while (bytestream2_tell(&s->gb) - start < src_size) { |
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242 |
opcode = bytestream2_get_byte(&s->gb); |
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243 |
ff_tlog(s->avctx, "opcode %02X: ", opcode); |
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244 |
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245 |
/* 0x80 means that frame is finished */
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246 |
if (opcode == 0x80) |
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247 |
break; |
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248 |
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249 |
if (dest_index >= dest_size) { |
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250 |
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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252 |
return AVERROR_INVALIDDATA; |
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253 |
}
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254 |
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255 |
if (opcode == 0xFF) { |
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256 |
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257 |
count = bytestream2_get_le16(&s->gb); |
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258 |
src_pos = bytestream2_get_le16(&s->gb); |
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259 |
ff_tlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos); |
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260 |
CHECK_COUNT(); |
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261 |
CHECK_COPY(src_pos); |
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262 |
for (i = 0; i < count; i++) |
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263 |
dest[dest_index + i] = dest[src_pos + i]; |
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264 |
dest_index += count; |
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265 |
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266 |
} else if (opcode == 0xFE) { |
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267 |
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268 |
count = bytestream2_get_le16(&s->gb); |
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269 |
color = bytestream2_get_byte(&s->gb); |
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270 |
ff_tlog(s->avctx, "(2) set %X bytes to %02X\n", count, color); |
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271 |
CHECK_COUNT(); |
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272 |
memset(&dest[dest_index], color, count); |
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273 |
dest_index += count; |
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274 |
||
275 |
} else if ((opcode & 0xC0) == 0xC0) { |
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276 |
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277 |
count = (opcode & 0x3F) + 3; |
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278 |
src_pos = bytestream2_get_le16(&s->gb); |
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279 |
ff_tlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos); |
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280 |
CHECK_COUNT(); |
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281 |
CHECK_COPY(src_pos); |
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282 |
for (i = 0; i < count; i++) |
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283 |
dest[dest_index + i] = dest[src_pos + i]; |
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284 |
dest_index += count; |
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285 |
||
286 |
} else if (opcode > 0x80) { |
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287 |
||
288 |
count = opcode & 0x3F; |
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289 |
ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count); |
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290 |
CHECK_COUNT(); |
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291 |
bytestream2_get_buffer(&s->gb, &dest[dest_index], count); |
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292 |
dest_index += count; |
|
293 |
||
294 |
} else { |
|
295 |
||
296 |
count = ((opcode & 0x70) >> 4) + 3; |
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297 |
src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8); |
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298 |
ff_tlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos); |
|
299 |
CHECK_COUNT(); |
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300 |
CHECK_COPY(dest_index - src_pos); |
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301 |
for (i = 0; i < count; i++) |
|
302 |
dest[dest_index + i] = dest[dest_index - src_pos + i]; |
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303 |
dest_index += count; |
|
304 |
}
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|
305 |
}
|
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306 |
||
307 |
/* validate that the entire destination buffer was filled; this is
|
|
308 |
* important for decoding frame maps since each vector needs to have a
|
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309 |
* codebook entry; it is not important for compressed codebooks because
|
|
310 |
* not every entry needs to be filled */
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311 |
if (check_size) |
|
312 |
if (dest_index < dest_size) { |
|
313 |
av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n", |
|
314 |
dest_index, dest_size); |
|
315 |
memset(dest + dest_index, 0, dest_size - dest_index); |
|
316 |
}
|
|
317 |
||
318 |
return 0; // let's display what we decoded anyway |
|
319 |
}
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|
320 |
||
321 |
static int vqa_decode_chunk(VqaContext *s, AVFrame *frame) |
|
322 |
{
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|
323 |
unsigned int chunk_type; |
|
324 |
unsigned int chunk_size; |
|
325 |
int byte_skip; |
|
326 |
unsigned int index = 0; |
|
327 |
int i; |
|
328 |
unsigned char r, g, b; |
|
329 |
int index_shift; |
|
330 |
int res; |
|
331 |
||
332 |
int cbf0_chunk = -1; |
|
333 |
int cbfz_chunk = -1; |
|
334 |
int cbp0_chunk = -1; |
|
335 |
int cbpz_chunk = -1; |
|
336 |
int cpl0_chunk = -1; |
|
337 |
int cplz_chunk = -1; |
|
338 |
int vptz_chunk = -1; |
|
339 |
||
340 |
int x, y; |
|
341 |
int lines = 0; |
|
342 |
int pixel_ptr; |
|
343 |
int vector_index = 0; |
|
344 |
int lobyte = 0; |
|
345 |
int hibyte = 0; |
|
346 |
int lobytes = 0; |
|
347 |
int hibytes = s->decode_buffer_size / 2; |
|
348 |
||
349 |
/* first, traverse through the frame and find the subchunks */
|
|
350 |
while (bytestream2_get_bytes_left(&s->gb) >= 8) { |
|
351 |
||
352 |
chunk_type = bytestream2_get_be32u(&s->gb); |
|
353 |
index = bytestream2_tell(&s->gb); |
|
354 |
chunk_size = bytestream2_get_be32u(&s->gb); |
|
355 |
||
356 |
switch (chunk_type) { |
|
357 |
||
358 |
case CBF0_TAG: |
|
359 |
cbf0_chunk = index; |
|
360 |
break; |
|
361 |
||
362 |
case CBFZ_TAG: |
|
363 |
cbfz_chunk = index; |
|
364 |
break; |
|
365 |
||
366 |
case CBP0_TAG: |
|
367 |
cbp0_chunk = index; |
|
368 |
break; |
|
369 |
||
370 |
case CBPZ_TAG: |
|
371 |
cbpz_chunk = index; |
|
372 |
break; |
|
373 |
||
374 |
case CPL0_TAG: |
|
375 |
cpl0_chunk = index; |
|
376 |
break; |
|
377 |
||
378 |
case CPLZ_TAG: |
|
379 |
cplz_chunk = index; |
|
380 |
break; |
|
381 |
||
382 |
case VPTZ_TAG: |
|
383 |
vptz_chunk = index; |
|
384 |
break; |
|
385 |
||
386 |
default: |
|
387 |
av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %c%c%c%c (%08X)\n", |
|
388 |
(chunk_type >> 24) & 0xFF, |
|
389 |
(chunk_type >> 16) & 0xFF, |
|
390 |
(chunk_type >> 8) & 0xFF, |
|
391 |
(chunk_type >> 0) & 0xFF, |
|
392 |
chunk_type); |
|
393 |
break; |
|
394 |
}
|
|
395 |
||
396 |
byte_skip = chunk_size & 0x01; |
|
397 |
bytestream2_skip(&s->gb, chunk_size + byte_skip); |
|
398 |
}
|
|
399 |
||
400 |
/* next, deal with the palette */
|
|
401 |
if ((cpl0_chunk != -1) && (cplz_chunk != -1)) { |
|
402 |
||
403 |
/* a chunk should not have both chunk types */
|
|
404 |
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n"); |
|
405 |
return AVERROR_INVALIDDATA; |
|
406 |
}
|
|
407 |
||
408 |
/* decompress the palette chunk */
|
|
409 |
if (cplz_chunk != -1) { |
|
410 |
||
411 |
/* yet to be handled */
|
|
412 |
||
413 |
}
|
|
414 |
||
415 |
/* convert the RGB palette into the machine's endian format */
|
|
416 |
if (cpl0_chunk != -1) { |
|
417 |
||
418 |
bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET); |
|
419 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
420 |
/* sanity check the palette size */
|
|
421 |
if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) { |
|
422 |
av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n", |
|
423 |
chunk_size / 3); |
|
424 |
return AVERROR_INVALIDDATA; |
|
425 |
}
|
|
426 |
for (i = 0; i < chunk_size / 3; i++) { |
|
427 |
/* scale by 4 to transform 6-bit palette -> 8-bit */
|
|
428 |
r = bytestream2_get_byteu(&s->gb) * 4; |
|
429 |
g = bytestream2_get_byteu(&s->gb) * 4; |
|
430 |
b = bytestream2_get_byteu(&s->gb) * 4; |
|
431 |
s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b; |
|
432 |
s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
|
433 |
}
|
|
434 |
}
|
|
435 |
||
436 |
/* next, look for a full codebook */
|
|
437 |
if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) { |
|
438 |
||
439 |
/* a chunk should not have both chunk types */
|
|
440 |
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n"); |
|
441 |
return AVERROR_INVALIDDATA; |
|
442 |
}
|
|
443 |
||
444 |
/* decompress the full codebook chunk */
|
|
445 |
if (cbfz_chunk != -1) { |
|
446 |
||
447 |
bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET); |
|
448 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
449 |
if ((res = decode_format80(s, chunk_size, s->codebook, |
|
450 |
s->codebook_size, 0)) < 0) |
|
451 |
return res; |
|
452 |
}
|
|
453 |
||
454 |
/* copy a full codebook */
|
|
455 |
if (cbf0_chunk != -1) { |
|
456 |
||
457 |
bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET); |
|
458 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
459 |
/* sanity check the full codebook size */
|
|
460 |
if (chunk_size > MAX_CODEBOOK_SIZE) { |
|
461 |
av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n", |
|
462 |
chunk_size); |
|
463 |
return AVERROR_INVALIDDATA; |
|
464 |
}
|
|
465 |
||
466 |
bytestream2_get_buffer(&s->gb, s->codebook, chunk_size); |
|
467 |
}
|
|
468 |
||
469 |
/* decode the frame */
|
|
470 |
if (vptz_chunk == -1) { |
|
471 |
||
472 |
/* something is wrong if there is no VPTZ chunk */
|
|
473 |
av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n"); |
|
474 |
return AVERROR_INVALIDDATA; |
|
475 |
}
|
|
476 |
||
477 |
bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET); |
|
478 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
479 |
if ((res = decode_format80(s, chunk_size, |
|
480 |
s->decode_buffer, s->decode_buffer_size, 1)) < 0) |
|
481 |
return res; |
|
482 |
||
483 |
/* render the final PAL8 frame */
|
|
484 |
if (s->vector_height == 4) |
|
485 |
index_shift = 4; |
|
486 |
else
|
|
487 |
index_shift = 3; |
|
488 |
for (y = 0; y < s->height; y += s->vector_height) { |
|
489 |
for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) { |
|
490 |
pixel_ptr = y * frame->linesize[0] + x; |
|
491 |
||
492 |
/* get the vector index, the method for which varies according to
|
|
493 |
* VQA file version */
|
|
494 |
switch (s->vqa_version) { |
|
495 |
||
496 |
case 1: |
|
497 |
lobyte = s->decode_buffer[lobytes * 2]; |
|
498 |
hibyte = s->decode_buffer[(lobytes * 2) + 1]; |
|
499 |
vector_index = ((hibyte << 8) | lobyte) >> 3; |
|
500 |
vector_index <<= index_shift; |
|
501 |
lines = s->vector_height; |
|
502 |
/* uniform color fill - a quick hack */
|
|
503 |
if (hibyte == 0xFF) { |
|
504 |
while (lines--) { |
|
505 |
frame->data[0][pixel_ptr + 0] = 255 - lobyte; |
|
506 |
frame->data[0][pixel_ptr + 1] = 255 - lobyte; |
|
507 |
frame->data[0][pixel_ptr + 2] = 255 - lobyte; |
|
508 |
frame->data[0][pixel_ptr + 3] = 255 - lobyte; |
|
509 |
pixel_ptr += frame->linesize[0]; |
|
510 |
}
|
|
511 |
lines=0; |
|
512 |
}
|
|
513 |
break; |
|
514 |
||
515 |
case 2: |
|
516 |
lobyte = s->decode_buffer[lobytes]; |
|
517 |
hibyte = s->decode_buffer[hibytes]; |
|
518 |
vector_index = (hibyte << 8) | lobyte; |
|
519 |
vector_index <<= index_shift; |
|
520 |
lines = s->vector_height; |
|
521 |
break; |
|
522 |
||
523 |
case 3: |
|
524 |
/* not implemented yet */
|
|
525 |
lines = 0; |
|
526 |
break; |
|
527 |
}
|
|
528 |
||
529 |
while (lines--) { |
|
530 |
frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++]; |
|
531 |
frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++]; |
|
532 |
frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++]; |
|
533 |
frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++]; |
|
534 |
pixel_ptr += frame->linesize[0]; |
|
535 |
}
|
|
536 |
}
|
|
537 |
}
|
|
538 |
||
539 |
/* handle partial codebook */
|
|
540 |
if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) { |
|
541 |
/* a chunk should not have both chunk types */
|
|
542 |
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n"); |
|
543 |
return AVERROR_INVALIDDATA; |
|
544 |
}
|
|
545 |
||
546 |
if (cbp0_chunk != -1) { |
|
547 |
||
548 |
bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET); |
|
549 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
550 |
||
551 |
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
|
552 |
av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n", |
|
553 |
chunk_size); |
|
554 |
return AVERROR_INVALIDDATA; |
|
555 |
}
|
|
556 |
||
557 |
/* accumulate partial codebook */
|
|
558 |
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
|
559 |
chunk_size); |
|
560 |
s->next_codebook_buffer_index += chunk_size; |
|
561 |
||
562 |
s->partial_countdown--; |
|
563 |
if (s->partial_countdown <= 0) { |
|
564 |
||
565 |
/* time to replace codebook */
|
|
566 |
memcpy(s->codebook, s->next_codebook_buffer, |
|
567 |
s->next_codebook_buffer_index); |
|
568 |
||
569 |
/* reset accounting */
|
|
570 |
s->next_codebook_buffer_index = 0; |
|
571 |
s->partial_countdown = s->partial_count; |
|
572 |
}
|
|
573 |
}
|
|
574 |
||
575 |
if (cbpz_chunk != -1) { |
|
576 |
||
577 |
bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET); |
|
578 |
chunk_size = bytestream2_get_be32(&s->gb); |
|
579 |
||
580 |
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
|
581 |
av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n", |
|
582 |
chunk_size); |
|
583 |
return AVERROR_INVALIDDATA; |
|
584 |
}
|
|
585 |
||
586 |
/* accumulate partial codebook */
|
|
587 |
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
|
588 |
chunk_size); |
|
589 |
s->next_codebook_buffer_index += chunk_size; |
|
590 |
||
591 |
s->partial_countdown--; |
|
592 |
if (s->partial_countdown <= 0) { |
|
593 |
bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index); |
|
594 |
/* decompress codebook */
|
|
595 |
if ((res = decode_format80(s, s->next_codebook_buffer_index, |
|
596 |
s->codebook, s->codebook_size, 0)) < 0) |
|
597 |
return res; |
|
598 |
||
599 |
/* reset accounting */
|
|
600 |
s->next_codebook_buffer_index = 0; |
|
601 |
s->partial_countdown = s->partial_count; |
|
602 |
}
|
|
603 |
}
|
|
604 |
||
605 |
return 0; |
|
606 |
}
|
|
607 |
||
608 |
static int vqa_decode_frame(AVCodecContext *avctx, |
|
609 |
void *data, int *got_frame, |
|
610 |
AVPacket *avpkt) |
|
611 |
{
|
|
612 |
VqaContext *s = avctx->priv_data; |
|
613 |
AVFrame *frame = data; |
|
614 |
int res; |
|
615 |
||
616 |
if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
|
617 |
return res; |
|
618 |
||
619 |
bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
|
620 |
if ((res = vqa_decode_chunk(s, frame)) < 0) |
|
621 |
return res; |
|
622 |
||
623 |
/* make the palette available on the way out */
|
|
624 |
memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4); |
|
625 |
frame->palette_has_changed = 1; |
|
626 |
||
627 |
*got_frame = 1; |
|
628 |
||
629 |
/* report that the buffer was completely consumed */
|
|
630 |
return avpkt->size; |
|
631 |
}
|
|
632 |
||
633 |
static av_cold int vqa_decode_end(AVCodecContext *avctx) |
|
634 |
{
|
|
635 |
VqaContext *s = avctx->priv_data; |
|
636 |
||
637 |
av_freep(&s->codebook); |
|
638 |
av_freep(&s->next_codebook_buffer); |
|
639 |
av_freep(&s->decode_buffer); |
|
640 |
||
641 |
return 0; |
|
642 |
}
|
|
643 |
||
644 |
AVCodec ff_vqa_decoder = { |
|
645 |
.name = "vqavideo", |
|
646 |
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"), |
|
647 |
.type = AVMEDIA_TYPE_VIDEO, |
|
648 |
.id = AV_CODEC_ID_WS_VQA, |
|
649 |
.priv_data_size = sizeof(VqaContext), |
|
650 |
.init = vqa_decode_init, |
|
651 |
.close = vqa_decode_end, |
|
652 |
.decode = vqa_decode_frame, |
|
653 |
.capabilities = CODEC_CAP_DR1, |
|
654 |
};
|