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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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* @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 |
53 |
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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> |
67 |
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#include <stdlib.h> |
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#include <string.h> |
69 |
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70 |
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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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86 |
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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') |
91 |
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#define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z') |
92 |
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#define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z') |
93 |
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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]; |
100 |
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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; |
111 |
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112 |
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unsigned char *decode_buffer; |
113 |
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int decode_buffer_size; |
114 |
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115 |
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/* number of frames to go before replacing codebook */ |
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int partial_countdown; |
117 |
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int partial_count; |
118 |
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119 |
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} VqaContext; |
120 |
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121 |
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static av_cold int vqa_decode_init(AVCodecContext *avctx) |
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{ |
123 |
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4 |
VqaContext *s = avctx->priv_data; |
124 |
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int i, j, codebook_index, ret; |
125 |
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126 |
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s->avctx = avctx; |
127 |
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4 |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
128 |
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129 |
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/* make sure the extradata made it */ |
130 |
✗✓ |
4 |
if (s->avctx->extradata_size != VQA_HEADER_SIZE) { |
131 |
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av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE); |
132 |
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return AVERROR(EINVAL); |
133 |
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} |
134 |
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135 |
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/* load up the VQA parameters from the header */ |
136 |
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4 |
s->vqa_version = s->avctx->extradata[0]; |
137 |
✓✗✗ |
4 |
switch (s->vqa_version) { |
138 |
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4 |
case 1: |
139 |
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case 2: |
140 |
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4 |
break; |
141 |
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case 3: |
142 |
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avpriv_report_missing_feature(avctx, "VQA Version %d", s->vqa_version); |
143 |
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return AVERROR_PATCHWELCOME; |
144 |
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default: |
145 |
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avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version); |
146 |
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return AVERROR_PATCHWELCOME; |
147 |
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} |
148 |
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4 |
s->width = AV_RL16(&s->avctx->extradata[6]); |
149 |
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4 |
s->height = AV_RL16(&s->avctx->extradata[8]); |
150 |
✗✓ |
4 |
if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 0) { |
151 |
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s->width= s->height= 0; |
152 |
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return ret; |
153 |
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} |
154 |
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4 |
s->vector_width = s->avctx->extradata[10]; |
155 |
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4 |
s->vector_height = s->avctx->extradata[11]; |
156 |
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4 |
s->partial_count = s->partial_countdown = s->avctx->extradata[13]; |
157 |
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158 |
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/* the vector dimensions have to meet very stringent requirements */ |
159 |
✓✗ |
4 |
if ((s->vector_width != 4) || |
160 |
✗✓✗✗
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((s->vector_height != 2) && (s->vector_height != 4))) { |
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/* return without further initialization */ |
162 |
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return AVERROR_INVALIDDATA; |
163 |
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} |
164 |
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165 |
✓✗✗✓
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4 |
if (s->width % s->vector_width || s->height % s->vector_height) { |
166 |
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av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n"); |
167 |
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return AVERROR_INVALIDDATA; |
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} |
169 |
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170 |
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/* allocate codebooks */ |
171 |
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s->codebook_size = MAX_CODEBOOK_SIZE; |
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s->codebook = av_malloc(s->codebook_size); |
173 |
✗✓ |
4 |
if (!s->codebook) |
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goto fail; |
175 |
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s->next_codebook_buffer = av_malloc(s->codebook_size); |
176 |
✗✓ |
4 |
if (!s->next_codebook_buffer) |
177 |
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goto fail; |
178 |
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179 |
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/* allocate decode buffer */ |
180 |
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4 |
s->decode_buffer_size = (s->width / s->vector_width) * |
181 |
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(s->height / s->vector_height) * 2; |
182 |
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s->decode_buffer = av_mallocz(s->decode_buffer_size); |
183 |
✗✓ |
4 |
if (!s->decode_buffer) |
184 |
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goto fail; |
185 |
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186 |
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/* initialize the solid-color vectors */ |
187 |
✗✓ |
4 |
if (s->vector_height == 4) { |
188 |
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codebook_index = 0xFF00 * 16; |
189 |
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for (i = 0; i < 256; i++) |
190 |
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for (j = 0; j < 16; j++) |
191 |
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s->codebook[codebook_index++] = i; |
192 |
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} else { |
193 |
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4 |
codebook_index = 0xF00 * 8; |
194 |
✓✓ |
1028 |
for (i = 0; i < 256; i++) |
195 |
✓✓ |
9216 |
for (j = 0; j < 8; j++) |
196 |
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8192 |
s->codebook[codebook_index++] = i; |
197 |
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} |
198 |
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4 |
s->next_codebook_buffer_index = 0; |
199 |
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200 |
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4 |
return 0; |
201 |
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fail: |
202 |
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av_freep(&s->codebook); |
203 |
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av_freep(&s->next_codebook_buffer); |
204 |
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av_freep(&s->decode_buffer); |
205 |
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return AVERROR(ENOMEM); |
206 |
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} |
207 |
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208 |
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#define CHECK_COUNT() \ |
209 |
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if (dest_index + count > dest_size) { \ |
210 |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \ |
211 |
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av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \ |
212 |
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dest_index, count, dest_size); \ |
213 |
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return AVERROR_INVALIDDATA; \ |
214 |
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} |
215 |
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216 |
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#define CHECK_COPY(idx) \ |
217 |
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if (idx < 0 || idx + count > dest_size) { \ |
218 |
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \ |
219 |
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av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \ |
220 |
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src_pos, count, dest_size); \ |
221 |
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return AVERROR_INVALIDDATA; \ |
222 |
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} |
223 |
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224 |
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225 |
|
38 |
static int decode_format80(VqaContext *s, int src_size, |
226 |
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unsigned char *dest, int dest_size, int check_size) { |
227 |
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228 |
|
38 |
int dest_index = 0; |
229 |
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int count, opcode, start; |
230 |
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int src_pos; |
231 |
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unsigned char color; |
232 |
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int i; |
233 |
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|
234 |
✓✗✗✓
|
38 |
if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) { |
235 |
|
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av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n", |
236 |
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src_size); |
237 |
|
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return AVERROR_INVALIDDATA; |
238 |
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} |
239 |
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|
240 |
|
38 |
start = bytestream2_tell(&s->gb); |
241 |
✓✗ |
44627 |
while (bytestream2_tell(&s->gb) - start < src_size) { |
242 |
|
44627 |
opcode = bytestream2_get_byte(&s->gb); |
243 |
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ff_tlog(s->avctx, "opcode %02X: ", opcode); |
244 |
|
|
|
245 |
|
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/* 0x80 means that frame is finished */ |
246 |
✓✓ |
44627 |
if (opcode == 0x80) |
247 |
|
38 |
break; |
248 |
|
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|
249 |
✗✓ |
44589 |
if (dest_index >= dest_size) { |
250 |
|
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av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n", |
251 |
|
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dest_index, dest_size); |
252 |
|
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return AVERROR_INVALIDDATA; |
253 |
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} |
254 |
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|
255 |
✓✓ |
44589 |
if (opcode == 0xFF) { |
256 |
|
|
|
257 |
|
265 |
count = bytestream2_get_le16(&s->gb); |
258 |
|
265 |
src_pos = bytestream2_get_le16(&s->gb); |
259 |
|
|
ff_tlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos); |
260 |
✗✓ |
265 |
CHECK_COUNT(); |
261 |
✓✗✗✓
|
265 |
CHECK_COPY(src_pos); |
262 |
✓✓ |
24430 |
for (i = 0; i < count; i++) |
263 |
|
24165 |
dest[dest_index + i] = dest[src_pos + i]; |
264 |
|
265 |
dest_index += count; |
265 |
|
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|
266 |
✓✓ |
44324 |
} else if (opcode == 0xFE) { |
267 |
|
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|
268 |
|
440 |
count = bytestream2_get_le16(&s->gb); |
269 |
|
440 |
color = bytestream2_get_byte(&s->gb); |
270 |
|
|
ff_tlog(s->avctx, "(2) set %X bytes to %02X\n", count, color); |
271 |
✗✓ |
440 |
CHECK_COUNT(); |
272 |
|
440 |
memset(&dest[dest_index], color, count); |
273 |
|
440 |
dest_index += count; |
274 |
|
|
|
275 |
✓✓ |
43884 |
} else if ((opcode & 0xC0) == 0xC0) { |
276 |
|
|
|
277 |
|
8741 |
count = (opcode & 0x3F) + 3; |
278 |
|
8741 |
src_pos = bytestream2_get_le16(&s->gb); |
279 |
|
|
ff_tlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos); |
280 |
✗✓ |
8741 |
CHECK_COUNT(); |
281 |
✓✗✗✓
|
8741 |
CHECK_COPY(src_pos); |
282 |
✓✓ |
190403 |
for (i = 0; i < count; i++) |
283 |
|
181662 |
dest[dest_index + i] = dest[src_pos + i]; |
284 |
|
8741 |
dest_index += count; |
285 |
|
|
|
286 |
✓✓ |
35143 |
} else if (opcode > 0x80) { |
287 |
|
|
|
288 |
|
12393 |
count = opcode & 0x3F; |
289 |
|
|
ff_tlog(s->avctx, "(4) copy %X bytes from source to dest\n", count); |
290 |
✗✓ |
12393 |
CHECK_COUNT(); |
291 |
|
12393 |
bytestream2_get_buffer(&s->gb, &dest[dest_index], count); |
292 |
|
12393 |
dest_index += count; |
293 |
|
|
|
294 |
|
|
} else { |
295 |
|
|
|
296 |
|
22750 |
count = ((opcode & 0x70) >> 4) + 3; |
297 |
|
22750 |
src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8); |
298 |
|
|
ff_tlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos); |
299 |
✗✓ |
22750 |
CHECK_COUNT(); |
300 |
✓✗✗✓
|
22750 |
CHECK_COPY(dest_index - src_pos); |
301 |
✓✓ |
136572 |
for (i = 0; i < count; i++) |
302 |
|
113822 |
dest[dest_index + i] = dest[dest_index - src_pos + i]; |
303 |
|
22750 |
dest_index += count; |
304 |
|
|
} |
305 |
|
|
} |
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 |
309 |
|
|
* codebook entry; it is not important for compressed codebooks because |
310 |
|
|
* not every entry needs to be filled */ |
311 |
✓✗ |
38 |
if (check_size) |
312 |
✗✓ |
38 |
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 |
|
38 |
return 0; // let's display what we decoded anyway |
319 |
|
|
} |
320 |
|
|
|
321 |
|
39 |
static int vqa_decode_chunk(VqaContext *s, AVFrame *frame) |
322 |
|
|
{ |
323 |
|
|
unsigned int chunk_type; |
324 |
|
|
unsigned int chunk_size; |
325 |
|
|
int byte_skip; |
326 |
|
39 |
unsigned int index = 0; |
327 |
|
|
int i; |
328 |
|
|
unsigned char r, g, b; |
329 |
|
|
int index_shift; |
330 |
|
|
int res; |
331 |
|
|
|
332 |
|
39 |
int cbf0_chunk = -1; |
333 |
|
39 |
int cbfz_chunk = -1; |
334 |
|
39 |
int cbp0_chunk = -1; |
335 |
|
39 |
int cbpz_chunk = -1; |
336 |
|
39 |
int cpl0_chunk = -1; |
337 |
|
39 |
int cplz_chunk = -1; |
338 |
|
39 |
int vptz_chunk = -1; |
339 |
|
|
|
340 |
|
|
int x, y; |
341 |
|
39 |
int lines = 0; |
342 |
|
|
int pixel_ptr; |
343 |
|
39 |
int vector_index = 0; |
344 |
|
39 |
int lobyte = 0; |
345 |
|
39 |
int hibyte = 0; |
346 |
|
39 |
int lobytes = 0; |
347 |
|
39 |
int hibytes = s->decode_buffer_size / 2; |
348 |
|
|
|
349 |
|
|
/* first, traverse through the frame and find the subchunks */ |
350 |
✓✓ |
118 |
while (bytestream2_get_bytes_left(&s->gb) >= 8) { |
351 |
|
|
|
352 |
|
79 |
chunk_type = bytestream2_get_be32u(&s->gb); |
353 |
|
79 |
index = bytestream2_tell(&s->gb); |
354 |
|
79 |
chunk_size = bytestream2_get_be32u(&s->gb); |
355 |
|
|
|
356 |
✓✗✓✗ ✓✗✓✗
|
79 |
switch (chunk_type) { |
357 |
|
|
|
358 |
|
1 |
case CBF0_TAG: |
359 |
|
1 |
cbf0_chunk = index; |
360 |
|
1 |
break; |
361 |
|
|
|
362 |
|
|
case CBFZ_TAG: |
363 |
|
|
cbfz_chunk = index; |
364 |
|
|
break; |
365 |
|
|
|
366 |
|
39 |
case CBP0_TAG: |
367 |
|
39 |
cbp0_chunk = index; |
368 |
|
39 |
break; |
369 |
|
|
|
370 |
|
|
case CBPZ_TAG: |
371 |
|
|
cbpz_chunk = index; |
372 |
|
|
break; |
373 |
|
|
|
374 |
|
1 |
case CPL0_TAG: |
375 |
|
1 |
cpl0_chunk = index; |
376 |
|
1 |
break; |
377 |
|
|
|
378 |
|
|
case CPLZ_TAG: |
379 |
|
|
cplz_chunk = index; |
380 |
|
|
break; |
381 |
|
|
|
382 |
|
38 |
case VPTZ_TAG: |
383 |
|
38 |
vptz_chunk = index; |
384 |
|
38 |
break; |
385 |
|
|
|
386 |
|
|
default: |
387 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %s (%08X)\n", |
388 |
|
|
av_fourcc2str(av_bswap32(chunk_type)), chunk_type); |
389 |
|
|
break; |
390 |
|
|
} |
391 |
|
|
|
392 |
|
79 |
byte_skip = chunk_size & 0x01; |
393 |
|
79 |
bytestream2_skip(&s->gb, chunk_size + byte_skip); |
394 |
|
|
} |
395 |
|
|
|
396 |
|
|
/* next, deal with the palette */ |
397 |
✓✓✗✓
|
39 |
if ((cpl0_chunk != -1) && (cplz_chunk != -1)) { |
398 |
|
|
|
399 |
|
|
/* a chunk should not have both chunk types */ |
400 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n"); |
401 |
|
|
return AVERROR_INVALIDDATA; |
402 |
|
|
} |
403 |
|
|
|
404 |
|
|
/* decompress the palette chunk */ |
405 |
|
|
if (cplz_chunk != -1) { |
406 |
|
|
|
407 |
|
|
/* yet to be handled */ |
408 |
|
|
|
409 |
|
|
} |
410 |
|
|
|
411 |
|
|
/* convert the RGB palette into the machine's endian format */ |
412 |
✓✓ |
39 |
if (cpl0_chunk != -1) { |
413 |
|
|
|
414 |
|
1 |
bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET); |
415 |
|
1 |
chunk_size = bytestream2_get_be32(&s->gb); |
416 |
|
|
/* sanity check the palette size */ |
417 |
✓✗✗✓
|
1 |
if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) { |
418 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n", |
419 |
|
|
chunk_size / 3); |
420 |
|
|
return AVERROR_INVALIDDATA; |
421 |
|
|
} |
422 |
✓✓ |
252 |
for (i = 0; i < chunk_size / 3; i++) { |
423 |
|
|
/* scale by 4 to transform 6-bit palette -> 8-bit */ |
424 |
|
251 |
r = bytestream2_get_byteu(&s->gb) * 4; |
425 |
|
251 |
g = bytestream2_get_byteu(&s->gb) * 4; |
426 |
|
251 |
b = bytestream2_get_byteu(&s->gb) * 4; |
427 |
|
251 |
s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b; |
428 |
|
251 |
s->palette[i] |= s->palette[i] >> 6 & 0x30303; |
429 |
|
|
} |
430 |
|
|
} |
431 |
|
|
|
432 |
|
|
/* next, look for a full codebook */ |
433 |
✓✓✗✓
|
39 |
if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) { |
434 |
|
|
|
435 |
|
|
/* a chunk should not have both chunk types */ |
436 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n"); |
437 |
|
|
return AVERROR_INVALIDDATA; |
438 |
|
|
} |
439 |
|
|
|
440 |
|
|
/* decompress the full codebook chunk */ |
441 |
✗✓ |
39 |
if (cbfz_chunk != -1) { |
442 |
|
|
|
443 |
|
|
bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET); |
444 |
|
|
chunk_size = bytestream2_get_be32(&s->gb); |
445 |
|
|
if ((res = decode_format80(s, chunk_size, s->codebook, |
446 |
|
|
s->codebook_size, 0)) < 0) |
447 |
|
|
return res; |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
/* copy a full codebook */ |
451 |
✓✓ |
39 |
if (cbf0_chunk != -1) { |
452 |
|
|
|
453 |
|
1 |
bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET); |
454 |
|
1 |
chunk_size = bytestream2_get_be32(&s->gb); |
455 |
|
|
/* sanity check the full codebook size */ |
456 |
✗✓ |
1 |
if (chunk_size > MAX_CODEBOOK_SIZE) { |
457 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n", |
458 |
|
|
chunk_size); |
459 |
|
|
return AVERROR_INVALIDDATA; |
460 |
|
|
} |
461 |
|
|
|
462 |
|
1 |
bytestream2_get_buffer(&s->gb, s->codebook, chunk_size); |
463 |
|
|
} |
464 |
|
|
|
465 |
|
|
/* decode the frame */ |
466 |
✓✓ |
39 |
if (vptz_chunk == -1) { |
467 |
|
|
|
468 |
|
|
/* something is wrong if there is no VPTZ chunk */ |
469 |
|
1 |
av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n"); |
470 |
|
1 |
return AVERROR_INVALIDDATA; |
471 |
|
|
} |
472 |
|
|
|
473 |
|
38 |
bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET); |
474 |
|
38 |
chunk_size = bytestream2_get_be32(&s->gb); |
475 |
✗✓ |
38 |
if ((res = decode_format80(s, chunk_size, |
476 |
|
|
s->decode_buffer, s->decode_buffer_size, 1)) < 0) |
477 |
|
|
return res; |
478 |
|
|
|
479 |
|
|
/* render the final PAL8 frame */ |
480 |
✗✓ |
38 |
if (s->vector_height == 4) |
481 |
|
|
index_shift = 4; |
482 |
|
|
else |
483 |
|
38 |
index_shift = 3; |
484 |
✓✓ |
3838 |
for (y = 0; y < s->height; y += s->vector_height) { |
485 |
✓✓ |
307800 |
for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) { |
486 |
|
304000 |
pixel_ptr = y * frame->linesize[0] + x; |
487 |
|
|
|
488 |
|
|
/* get the vector index, the method for which varies according to |
489 |
|
|
* VQA file version */ |
490 |
✗✓✗✗
|
304000 |
switch (s->vqa_version) { |
491 |
|
|
|
492 |
|
|
case 1: |
493 |
|
|
lobyte = s->decode_buffer[lobytes * 2]; |
494 |
|
|
hibyte = s->decode_buffer[(lobytes * 2) + 1]; |
495 |
|
|
vector_index = ((hibyte << 8) | lobyte) >> 3; |
496 |
|
|
vector_index <<= index_shift; |
497 |
|
|
lines = s->vector_height; |
498 |
|
|
/* uniform color fill - a quick hack */ |
499 |
|
|
if (hibyte == 0xFF) { |
500 |
|
|
while (lines--) { |
501 |
|
|
frame->data[0][pixel_ptr + 0] = 255 - lobyte; |
502 |
|
|
frame->data[0][pixel_ptr + 1] = 255 - lobyte; |
503 |
|
|
frame->data[0][pixel_ptr + 2] = 255 - lobyte; |
504 |
|
|
frame->data[0][pixel_ptr + 3] = 255 - lobyte; |
505 |
|
|
pixel_ptr += frame->linesize[0]; |
506 |
|
|
} |
507 |
|
|
lines=0; |
508 |
|
|
} |
509 |
|
|
break; |
510 |
|
|
|
511 |
|
304000 |
case 2: |
512 |
|
304000 |
lobyte = s->decode_buffer[lobytes]; |
513 |
|
304000 |
hibyte = s->decode_buffer[hibytes]; |
514 |
|
304000 |
vector_index = (hibyte << 8) | lobyte; |
515 |
|
304000 |
vector_index <<= index_shift; |
516 |
|
304000 |
lines = s->vector_height; |
517 |
|
304000 |
break; |
518 |
|
|
|
519 |
|
|
case 3: |
520 |
|
|
/* not implemented yet */ |
521 |
|
|
lines = 0; |
522 |
|
|
break; |
523 |
|
|
} |
524 |
|
|
|
525 |
✓✓ |
912000 |
while (lines--) { |
526 |
|
608000 |
frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++]; |
527 |
|
608000 |
frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++]; |
528 |
|
608000 |
frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++]; |
529 |
|
608000 |
frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++]; |
530 |
|
608000 |
pixel_ptr += frame->linesize[0]; |
531 |
|
|
} |
532 |
|
|
} |
533 |
|
|
} |
534 |
|
|
|
535 |
|
|
/* handle partial codebook */ |
536 |
✓✗✗✓
|
38 |
if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) { |
537 |
|
|
/* a chunk should not have both chunk types */ |
538 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n"); |
539 |
|
|
return AVERROR_INVALIDDATA; |
540 |
|
|
} |
541 |
|
|
|
542 |
✓✗ |
38 |
if (cbp0_chunk != -1) { |
543 |
|
|
|
544 |
|
38 |
bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET); |
545 |
|
38 |
chunk_size = bytestream2_get_be32(&s->gb); |
546 |
|
|
|
547 |
✗✓ |
38 |
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
548 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n", |
549 |
|
|
chunk_size); |
550 |
|
|
return AVERROR_INVALIDDATA; |
551 |
|
|
} |
552 |
|
|
|
553 |
|
|
/* accumulate partial codebook */ |
554 |
|
38 |
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
555 |
|
|
chunk_size); |
556 |
|
38 |
s->next_codebook_buffer_index += chunk_size; |
557 |
|
|
|
558 |
|
38 |
s->partial_countdown--; |
559 |
✓✓ |
38 |
if (s->partial_countdown <= 0) { |
560 |
|
|
|
561 |
|
|
/* time to replace codebook */ |
562 |
|
4 |
memcpy(s->codebook, s->next_codebook_buffer, |
563 |
|
4 |
s->next_codebook_buffer_index); |
564 |
|
|
|
565 |
|
|
/* reset accounting */ |
566 |
|
4 |
s->next_codebook_buffer_index = 0; |
567 |
|
4 |
s->partial_countdown = s->partial_count; |
568 |
|
|
} |
569 |
|
|
} |
570 |
|
|
|
571 |
✗✓ |
38 |
if (cbpz_chunk != -1) { |
572 |
|
|
|
573 |
|
|
bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET); |
574 |
|
|
chunk_size = bytestream2_get_be32(&s->gb); |
575 |
|
|
|
576 |
|
|
if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) { |
577 |
|
|
av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n", |
578 |
|
|
chunk_size); |
579 |
|
|
return AVERROR_INVALIDDATA; |
580 |
|
|
} |
581 |
|
|
|
582 |
|
|
/* accumulate partial codebook */ |
583 |
|
|
bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index], |
584 |
|
|
chunk_size); |
585 |
|
|
s->next_codebook_buffer_index += chunk_size; |
586 |
|
|
|
587 |
|
|
s->partial_countdown--; |
588 |
|
|
if (s->partial_countdown <= 0) { |
589 |
|
|
bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index); |
590 |
|
|
/* decompress codebook */ |
591 |
|
|
if ((res = decode_format80(s, s->next_codebook_buffer_index, |
592 |
|
|
s->codebook, s->codebook_size, 0)) < 0) |
593 |
|
|
return res; |
594 |
|
|
|
595 |
|
|
/* reset accounting */ |
596 |
|
|
s->next_codebook_buffer_index = 0; |
597 |
|
|
s->partial_countdown = s->partial_count; |
598 |
|
|
} |
599 |
|
|
} |
600 |
|
|
|
601 |
|
38 |
return 0; |
602 |
|
|
} |
603 |
|
|
|
604 |
|
39 |
static int vqa_decode_frame(AVCodecContext *avctx, |
605 |
|
|
void *data, int *got_frame, |
606 |
|
|
AVPacket *avpkt) |
607 |
|
|
{ |
608 |
|
39 |
VqaContext *s = avctx->priv_data; |
609 |
|
39 |
AVFrame *frame = data; |
610 |
|
|
int res; |
611 |
|
|
|
612 |
✗✓ |
39 |
if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
613 |
|
|
return res; |
614 |
|
|
|
615 |
|
39 |
bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
616 |
✓✓ |
39 |
if ((res = vqa_decode_chunk(s, frame)) < 0) |
617 |
|
1 |
return res; |
618 |
|
|
|
619 |
|
|
/* make the palette available on the way out */ |
620 |
|
38 |
memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4); |
621 |
|
38 |
frame->palette_has_changed = 1; |
622 |
|
|
|
623 |
|
38 |
*got_frame = 1; |
624 |
|
|
|
625 |
|
|
/* report that the buffer was completely consumed */ |
626 |
|
38 |
return avpkt->size; |
627 |
|
|
} |
628 |
|
|
|
629 |
|
4 |
static av_cold int vqa_decode_end(AVCodecContext *avctx) |
630 |
|
|
{ |
631 |
|
4 |
VqaContext *s = avctx->priv_data; |
632 |
|
|
|
633 |
|
4 |
av_freep(&s->codebook); |
634 |
|
4 |
av_freep(&s->next_codebook_buffer); |
635 |
|
4 |
av_freep(&s->decode_buffer); |
636 |
|
|
|
637 |
|
4 |
return 0; |
638 |
|
|
} |
639 |
|
|
|
640 |
|
|
static const AVCodecDefault vqa_defaults[] = { |
641 |
|
|
{ "max_pixels", "320*240" }, |
642 |
|
|
{ NULL }, |
643 |
|
|
}; |
644 |
|
|
|
645 |
|
|
AVCodec ff_vqa_decoder = { |
646 |
|
|
.name = "vqavideo", |
647 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"), |
648 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
649 |
|
|
.id = AV_CODEC_ID_WS_VQA, |
650 |
|
|
.priv_data_size = sizeof(VqaContext), |
651 |
|
|
.init = vqa_decode_init, |
652 |
|
|
.close = vqa_decode_end, |
653 |
|
|
.decode = vqa_decode_frame, |
654 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
655 |
|
|
.defaults = vqa_defaults, |
656 |
|
|
}; |