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/* |
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* Wing Commander/Xan Video Decoder |
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* Copyright (C) 2011 Konstantin Shishkov |
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* based on work by Mike Melanson |
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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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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mem.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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typedef struct XanContext { |
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AVCodecContext *avctx; |
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AVFrame *pic; |
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uint8_t *y_buffer; |
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uint8_t *scratch_buffer; |
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int buffer_size; |
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GetByteContext gb; |
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} XanContext; |
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static av_cold int xan_decode_end(AVCodecContext *avctx) |
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{ |
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XanContext *s = avctx->priv_data; |
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av_frame_free(&s->pic); |
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av_freep(&s->y_buffer); |
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av_freep(&s->scratch_buffer); |
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return 0; |
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} |
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static av_cold int xan_decode_init(AVCodecContext *avctx) |
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{ |
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XanContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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✗✓ |
3 |
if (avctx->height < 8) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid frame height: %d.\n", avctx->height); |
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return AVERROR(EINVAL); |
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} |
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✗✓ |
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if (avctx->width & 1) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid frame width: %d.\n", avctx->width); |
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return AVERROR(EINVAL); |
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} |
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s->buffer_size = avctx->width * avctx->height; |
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s->y_buffer = av_malloc(s->buffer_size); |
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✗✓ |
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if (!s->y_buffer) |
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return AVERROR(ENOMEM); |
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s->scratch_buffer = av_malloc(s->buffer_size + 130); |
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✗✓ |
3 |
if (!s->scratch_buffer) |
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return AVERROR(ENOMEM); |
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s->pic = av_frame_alloc(); |
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✗✓ |
3 |
if (!s->pic) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static int xan_unpack_luma(XanContext *s, |
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uint8_t *dst, const int dst_size) |
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{ |
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int tree_size, eof; |
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int bits, mask; |
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int tree_root, node; |
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const uint8_t *dst_end = dst + dst_size; |
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GetByteContext tree = s->gb; |
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int start_off = bytestream2_tell(&tree); |
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tree_size = bytestream2_get_byte(&s->gb); |
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eof = bytestream2_get_byte(&s->gb); |
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tree_root = eof + tree_size; |
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bytestream2_skip(&s->gb, tree_size * 2); |
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node = tree_root; |
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bits = bytestream2_get_byte(&s->gb); |
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mask = 0x80; |
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691350 |
for (;;) { |
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691371 |
int bit = !!(bits & mask); |
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691371 |
mask >>= 1; |
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691371 |
bytestream2_seek(&tree, start_off + node*2 + bit - eof * 2, SEEK_SET); |
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691371 |
node = bytestream2_get_byte(&tree); |
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✓✓ |
691371 |
if (node == eof) |
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break; |
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✓✓ |
691350 |
if (node < eof) { |
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554400 |
*dst++ = node; |
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✗✓ |
554400 |
if (dst > dst_end) |
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break; |
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554400 |
node = tree_root; |
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} |
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✓✓ |
691350 |
if (!mask) { |
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✗✓ |
86409 |
if (bytestream2_get_bytes_left(&s->gb) <= 0) |
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break; |
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86409 |
bits = bytestream2_get_byteu(&s->gb); |
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86409 |
mask = 0x80; |
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} |
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} |
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✗✓ |
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return dst != dst_end ? AVERROR_INVALIDDATA : 0; |
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} |
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/* almost the same as in xan_wc3 decoder */ |
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static int xan_unpack(XanContext *s, |
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uint8_t *dest, const int dest_len) |
128 |
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{ |
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uint8_t opcode; |
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int size; |
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uint8_t *orig_dest = dest; |
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const uint8_t *dest_end = dest + dest_len; |
133 |
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✓✓ |
11861 |
while (dest < dest_end) { |
135 |
✗✓ |
11856 |
if (bytestream2_get_bytes_left(&s->gb) <= 0) |
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return AVERROR_INVALIDDATA; |
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11856 |
opcode = bytestream2_get_byteu(&s->gb); |
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✓✓ |
11856 |
if (opcode < 0xe0) { |
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int size2, back; |
142 |
✓✓ |
11348 |
if ((opcode & 0x80) == 0) { |
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7882 |
size = opcode & 3; |
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7882 |
back = ((opcode & 0x60) << 3) + bytestream2_get_byte(&s->gb) + 1; |
145 |
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7882 |
size2 = ((opcode & 0x1c) >> 2) + 3; |
146 |
✓✓ |
3466 |
} else if ((opcode & 0x40) == 0) { |
147 |
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3066 |
size = bytestream2_peek_byte(&s->gb) >> 6; |
148 |
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back = (bytestream2_get_be16(&s->gb) & 0x3fff) + 1; |
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3066 |
size2 = (opcode & 0x3f) + 4; |
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} else { |
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size = opcode & 3; |
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back = ((opcode & 0x10) << 12) + bytestream2_get_be16(&s->gb) + 1; |
153 |
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size2 = ((opcode & 0x0c) << 6) + bytestream2_get_byte(&s->gb) + 5; |
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✗✓ |
400 |
if (size + size2 > dest_end - dest) |
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break; |
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} |
157 |
✓✗ |
11348 |
if (dest + size + size2 > dest_end || |
158 |
✗✓ |
11348 |
dest - orig_dest + size < back) |
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return AVERROR_INVALIDDATA; |
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11348 |
bytestream2_get_buffer(&s->gb, dest, size); |
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11348 |
dest += size; |
162 |
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11348 |
av_memcpy_backptr(dest, back, size2); |
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11348 |
dest += size2; |
164 |
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} else { |
165 |
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508 |
int finish = opcode >= 0xfc; |
166 |
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167 |
✓✓ |
508 |
size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4; |
168 |
✗✓ |
508 |
if (dest_end - dest < size) |
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return AVERROR_INVALIDDATA; |
170 |
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bytestream2_get_buffer(&s->gb, dest, size); |
171 |
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dest += size; |
172 |
✓✓ |
508 |
if (finish) |
173 |
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21 |
break; |
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} |
175 |
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} |
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return dest - orig_dest; |
177 |
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} |
178 |
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179 |
|
21 |
static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off) |
180 |
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{ |
181 |
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XanContext *s = avctx->priv_data; |
182 |
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uint8_t *U, *V; |
183 |
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int val, uval, vval; |
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int i, j; |
185 |
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const uint8_t *src, *src_end; |
186 |
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const uint8_t *table; |
187 |
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int mode, offset, dec_size, table_size; |
188 |
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189 |
✗✓ |
21 |
if (!chroma_off) |
190 |
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return 0; |
191 |
✗✓ |
21 |
if (chroma_off + 4 >= bytestream2_get_bytes_left(&s->gb)) { |
192 |
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av_log(avctx, AV_LOG_ERROR, "Invalid chroma block position\n"); |
193 |
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return AVERROR_INVALIDDATA; |
194 |
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} |
195 |
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21 |
bytestream2_seek(&s->gb, chroma_off + 4, SEEK_SET); |
196 |
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21 |
mode = bytestream2_get_le16(&s->gb); |
197 |
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21 |
table = s->gb.buffer; |
198 |
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21 |
table_size = bytestream2_get_le16(&s->gb); |
199 |
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21 |
offset = table_size * 2; |
200 |
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21 |
table_size += 1; |
201 |
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202 |
✗✓ |
21 |
if (offset >= bytestream2_get_bytes_left(&s->gb)) { |
203 |
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av_log(avctx, AV_LOG_ERROR, "Invalid chroma block offset\n"); |
204 |
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return AVERROR_INVALIDDATA; |
205 |
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} |
206 |
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207 |
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21 |
bytestream2_skip(&s->gb, offset); |
208 |
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21 |
memset(s->scratch_buffer, 0, s->buffer_size); |
209 |
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21 |
dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size); |
210 |
✗✓ |
21 |
if (dec_size < 0) { |
211 |
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av_log(avctx, AV_LOG_ERROR, "Chroma unpacking failed\n"); |
212 |
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return dec_size; |
213 |
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} |
214 |
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215 |
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21 |
U = s->pic->data[1]; |
216 |
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21 |
V = s->pic->data[2]; |
217 |
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21 |
src = s->scratch_buffer; |
218 |
|
21 |
src_end = src + dec_size; |
219 |
✓✓ |
21 |
if (mode) { |
220 |
✓✓ |
332 |
for (j = 0; j < avctx->height >> 1; j++) { |
221 |
✓✓ |
52808 |
for (i = 0; i < avctx->width >> 1; i++) { |
222 |
✗✓ |
52480 |
if (src_end - src < 1) |
223 |
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return 0; |
224 |
|
52480 |
val = *src++; |
225 |
✓✗ |
52480 |
if (val) { |
226 |
✗✓ |
52480 |
if (val >= table_size) |
227 |
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return AVERROR_INVALIDDATA; |
228 |
|
52480 |
val = AV_RL16(table + (val << 1)); |
229 |
|
52480 |
uval = (val >> 3) & 0xF8; |
230 |
|
52480 |
vval = (val >> 8) & 0xF8; |
231 |
|
52480 |
U[i] = uval | (uval >> 5); |
232 |
|
52480 |
V[i] = vval | (vval >> 5); |
233 |
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} |
234 |
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} |
235 |
|
328 |
U += s->pic->linesize[1]; |
236 |
|
328 |
V += s->pic->linesize[2]; |
237 |
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} |
238 |
✓✗ |
4 |
if (avctx->height & 1) { |
239 |
|
4 |
memcpy(U, U - s->pic->linesize[1], avctx->width >> 1); |
240 |
|
4 |
memcpy(V, V - s->pic->linesize[2], avctx->width >> 1); |
241 |
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} |
242 |
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} else { |
243 |
|
17 |
uint8_t *U2 = U + s->pic->linesize[1]; |
244 |
|
17 |
uint8_t *V2 = V + s->pic->linesize[2]; |
245 |
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|
246 |
✓✓ |
714 |
for (j = 0; j < avctx->height >> 2; j++) { |
247 |
✓✓ |
56457 |
for (i = 0; i < avctx->width >> 1; i += 2) { |
248 |
✗✓ |
55760 |
if (src_end - src < 1) |
249 |
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return 0; |
250 |
|
55760 |
val = *src++; |
251 |
✓✓ |
55760 |
if (val) { |
252 |
✗✓ |
17613 |
if (val >= table_size) |
253 |
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return AVERROR_INVALIDDATA; |
254 |
|
17613 |
val = AV_RL16(table + (val << 1)); |
255 |
|
17613 |
uval = (val >> 3) & 0xF8; |
256 |
|
17613 |
vval = (val >> 8) & 0xF8; |
257 |
|
17613 |
U[i] = U[i+1] = U2[i] = U2[i+1] = uval | (uval >> 5); |
258 |
|
17613 |
V[i] = V[i+1] = V2[i] = V2[i+1] = vval | (vval >> 5); |
259 |
|
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} |
260 |
|
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} |
261 |
|
697 |
U += s->pic->linesize[1] * 2; |
262 |
|
697 |
V += s->pic->linesize[2] * 2; |
263 |
|
697 |
U2 += s->pic->linesize[1] * 2; |
264 |
|
697 |
V2 += s->pic->linesize[2] * 2; |
265 |
|
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} |
266 |
✓✗ |
17 |
if (avctx->height & 3) { |
267 |
|
17 |
int lines = ((avctx->height + 1) >> 1) - (avctx->height >> 2) * 2; |
268 |
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|
269 |
|
17 |
memcpy(U, U - lines * s->pic->linesize[1], lines * s->pic->linesize[1]); |
270 |
|
17 |
memcpy(V, V - lines * s->pic->linesize[2], lines * s->pic->linesize[2]); |
271 |
|
|
} |
272 |
|
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} |
273 |
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274 |
|
21 |
return 0; |
275 |
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} |
276 |
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|
277 |
|
5 |
static int xan_decode_frame_type0(AVCodecContext *avctx) |
278 |
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{ |
279 |
|
5 |
XanContext *s = avctx->priv_data; |
280 |
|
5 |
uint8_t *ybuf, *prev_buf, *src = s->scratch_buffer; |
281 |
|
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unsigned chroma_off, corr_off; |
282 |
|
|
int cur, last; |
283 |
|
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int i, j; |
284 |
|
|
int ret; |
285 |
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|
286 |
|
5 |
chroma_off = bytestream2_get_le32(&s->gb); |
287 |
|
5 |
corr_off = bytestream2_get_le32(&s->gb); |
288 |
|
|
|
289 |
✗✓ |
5 |
if ((ret = xan_decode_chroma(avctx, chroma_off)) != 0) |
290 |
|
|
return ret; |
291 |
|
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|
292 |
✗✓ |
5 |
if (corr_off >= bytestream2_size(&s->gb)) { |
293 |
|
|
av_log(avctx, AV_LOG_WARNING, "Ignoring invalid correction block position\n"); |
294 |
|
|
corr_off = 0; |
295 |
|
|
} |
296 |
|
5 |
bytestream2_seek(&s->gb, 12, SEEK_SET); |
297 |
|
5 |
ret = xan_unpack_luma(s, src, s->buffer_size >> 1); |
298 |
✗✓ |
5 |
if (ret) { |
299 |
|
|
av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n"); |
300 |
|
|
return ret; |
301 |
|
|
} |
302 |
|
|
|
303 |
|
5 |
ybuf = s->y_buffer; |
304 |
|
5 |
last = *src++; |
305 |
|
5 |
ybuf[0] = last << 1; |
306 |
✓✓ |
800 |
for (j = 1; j < avctx->width - 1; j += 2) { |
307 |
|
795 |
cur = (last + *src++) & 0x1F; |
308 |
|
795 |
ybuf[j] = last + cur; |
309 |
|
795 |
ybuf[j+1] = cur << 1; |
310 |
|
795 |
last = cur; |
311 |
|
|
} |
312 |
|
5 |
ybuf[j] = last << 1; |
313 |
|
5 |
prev_buf = ybuf; |
314 |
|
5 |
ybuf += avctx->width; |
315 |
|
|
|
316 |
✓✓ |
825 |
for (i = 1; i < avctx->height; i++) { |
317 |
|
820 |
last = ((prev_buf[0] >> 1) + *src++) & 0x1F; |
318 |
|
820 |
ybuf[0] = last << 1; |
319 |
✓✓ |
131200 |
for (j = 1; j < avctx->width - 1; j += 2) { |
320 |
|
130380 |
cur = ((prev_buf[j + 1] >> 1) + *src++) & 0x1F; |
321 |
|
130380 |
ybuf[j] = last + cur; |
322 |
|
130380 |
ybuf[j+1] = cur << 1; |
323 |
|
130380 |
last = cur; |
324 |
|
|
} |
325 |
|
820 |
ybuf[j] = last << 1; |
326 |
|
820 |
prev_buf = ybuf; |
327 |
|
820 |
ybuf += avctx->width; |
328 |
|
|
} |
329 |
|
|
|
330 |
✓✗ |
5 |
if (corr_off) { |
331 |
|
|
int dec_size; |
332 |
|
|
|
333 |
|
5 |
bytestream2_seek(&s->gb, 8 + corr_off, SEEK_SET); |
334 |
|
5 |
dec_size = xan_unpack(s, s->scratch_buffer, s->buffer_size / 2); |
335 |
✗✓ |
5 |
if (dec_size < 0) |
336 |
|
|
dec_size = 0; |
337 |
|
|
else |
338 |
✓✗ |
5 |
dec_size = FFMIN(dec_size, s->buffer_size/2 - 1); |
339 |
|
|
|
340 |
✓✓ |
132000 |
for (i = 0; i < dec_size; i++) |
341 |
|
131995 |
s->y_buffer[i*2+1] = (s->y_buffer[i*2+1] + (s->scratch_buffer[i] << 1)) & 0x3F; |
342 |
|
|
} |
343 |
|
|
|
344 |
|
5 |
src = s->y_buffer; |
345 |
|
5 |
ybuf = s->pic->data[0]; |
346 |
✓✓ |
830 |
for (j = 0; j < avctx->height; j++) { |
347 |
✓✓ |
264825 |
for (i = 0; i < avctx->width; i++) |
348 |
|
264000 |
ybuf[i] = (src[i] << 2) | (src[i] >> 3); |
349 |
|
825 |
src += avctx->width; |
350 |
|
825 |
ybuf += s->pic->linesize[0]; |
351 |
|
|
} |
352 |
|
|
|
353 |
|
5 |
return 0; |
354 |
|
|
} |
355 |
|
|
|
356 |
|
16 |
static int xan_decode_frame_type1(AVCodecContext *avctx) |
357 |
|
|
{ |
358 |
|
16 |
XanContext *s = avctx->priv_data; |
359 |
|
16 |
uint8_t *ybuf, *src = s->scratch_buffer; |
360 |
|
|
int cur, last; |
361 |
|
|
int i, j; |
362 |
|
|
int ret; |
363 |
|
|
|
364 |
✗✓ |
16 |
if ((ret = xan_decode_chroma(avctx, bytestream2_get_le32(&s->gb))) != 0) |
365 |
|
|
return ret; |
366 |
|
|
|
367 |
|
16 |
bytestream2_seek(&s->gb, 16, SEEK_SET); |
368 |
|
16 |
ret = xan_unpack_luma(s, src, |
369 |
|
16 |
s->buffer_size >> 1); |
370 |
✗✓ |
16 |
if (ret) { |
371 |
|
|
av_log(avctx, AV_LOG_ERROR, "Luma decoding failed\n"); |
372 |
|
|
return ret; |
373 |
|
|
} |
374 |
|
|
|
375 |
|
16 |
ybuf = s->y_buffer; |
376 |
✓✓ |
2656 |
for (i = 0; i < avctx->height; i++) { |
377 |
|
2640 |
last = (ybuf[0] + (*src++ << 1)) & 0x3F; |
378 |
|
2640 |
ybuf[0] = last; |
379 |
✓✓ |
422400 |
for (j = 1; j < avctx->width - 1; j += 2) { |
380 |
|
419760 |
cur = (ybuf[j + 1] + (*src++ << 1)) & 0x3F; |
381 |
|
419760 |
ybuf[j] = (last + cur) >> 1; |
382 |
|
419760 |
ybuf[j+1] = cur; |
383 |
|
419760 |
last = cur; |
384 |
|
|
} |
385 |
|
2640 |
ybuf[j] = last; |
386 |
|
2640 |
ybuf += avctx->width; |
387 |
|
|
} |
388 |
|
|
|
389 |
|
16 |
src = s->y_buffer; |
390 |
|
16 |
ybuf = s->pic->data[0]; |
391 |
✓✓ |
2656 |
for (j = 0; j < avctx->height; j++) { |
392 |
✓✓ |
847440 |
for (i = 0; i < avctx->width; i++) |
393 |
|
844800 |
ybuf[i] = (src[i] << 2) | (src[i] >> 3); |
394 |
|
2640 |
src += avctx->width; |
395 |
|
2640 |
ybuf += s->pic->linesize[0]; |
396 |
|
|
} |
397 |
|
|
|
398 |
|
16 |
return 0; |
399 |
|
|
} |
400 |
|
|
|
401 |
|
21 |
static int xan_decode_frame(AVCodecContext *avctx, |
402 |
|
|
void *data, int *got_frame, |
403 |
|
|
AVPacket *avpkt) |
404 |
|
|
{ |
405 |
|
21 |
XanContext *s = avctx->priv_data; |
406 |
|
|
int ftype; |
407 |
|
|
int ret; |
408 |
|
|
|
409 |
✗✓ |
21 |
if ((ret = ff_reget_buffer(avctx, s->pic, 0)) < 0) |
410 |
|
|
return ret; |
411 |
|
|
|
412 |
|
21 |
bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
413 |
|
21 |
ftype = bytestream2_get_le32(&s->gb); |
414 |
✓✓✗ |
21 |
switch (ftype) { |
415 |
|
5 |
case 0: |
416 |
|
5 |
ret = xan_decode_frame_type0(avctx); |
417 |
|
5 |
break; |
418 |
|
16 |
case 1: |
419 |
|
16 |
ret = xan_decode_frame_type1(avctx); |
420 |
|
16 |
break; |
421 |
|
|
default: |
422 |
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown frame type %d\n", ftype); |
423 |
|
|
return AVERROR_INVALIDDATA; |
424 |
|
|
} |
425 |
✗✓ |
21 |
if (ret) |
426 |
|
|
return ret; |
427 |
|
|
|
428 |
✗✓ |
21 |
if ((ret = av_frame_ref(data, s->pic)) < 0) |
429 |
|
|
return ret; |
430 |
|
|
|
431 |
|
21 |
*got_frame = 1; |
432 |
|
|
|
433 |
|
21 |
return avpkt->size; |
434 |
|
|
} |
435 |
|
|
|
436 |
|
|
AVCodec ff_xan_wc4_decoder = { |
437 |
|
|
.name = "xan_wc4", |
438 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Wing Commander IV / Xxan"), |
439 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
440 |
|
|
.id = AV_CODEC_ID_XAN_WC4, |
441 |
|
|
.priv_data_size = sizeof(XanContext), |
442 |
|
|
.init = xan_decode_init, |
443 |
|
|
.close = xan_decode_end, |
444 |
|
|
.decode = xan_decode_frame, |
445 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
446 |
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE, |
447 |
|
|
}; |