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/* |
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* Electronic Arts Madcow Video Decoder |
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* Copyright (c) 2007-2009 Peter Ross |
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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 St, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Electronic Arts Madcow Video Decoder |
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* @author Peter Ross <pross@xvid.org> |
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* |
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* @see technical details at |
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD |
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*/ |
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#include "avcodec.h" |
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#include "blockdsp.h" |
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#include "bytestream.h" |
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#include "bswapdsp.h" |
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#include "get_bits.h" |
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#include "aandcttab.h" |
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#include "eaidct.h" |
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#include "idctdsp.h" |
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#include "internal.h" |
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#include "mpeg12data.h" |
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#include "mpeg12vlc.h" |
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#define EA_PREAMBLE_SIZE 8 |
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#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */ |
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#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */ |
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#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */ |
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typedef struct MadContext { |
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AVCodecContext *avctx; |
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BlockDSPContext bdsp; |
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BswapDSPContext bbdsp; |
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IDCTDSPContext idsp; |
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AVFrame *last_frame; |
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GetBitContext gb; |
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void *bitstream_buf; |
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unsigned int bitstream_buf_size; |
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DECLARE_ALIGNED(32, int16_t, block)[64]; |
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ScanTable scantable; |
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uint16_t quant_matrix[64]; |
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int mb_x; |
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int mb_y; |
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} MadContext; |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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MadContext *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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ff_blockdsp_init(&s->bdsp, avctx); |
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ff_bswapdsp_init(&s->bbdsp); |
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ff_idctdsp_init(&s->idsp, avctx); |
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ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE); |
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ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct); |
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ff_mpeg12_init_vlcs(); |
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s->last_frame = av_frame_alloc(); |
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✗✓ |
4 |
if (!s->last_frame) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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665174 |
static inline void comp(unsigned char *dst, ptrdiff_t dst_stride, |
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unsigned char *src, ptrdiff_t src_stride, int add) |
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{ |
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int j, i; |
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✓✓ |
5986566 |
for (j=0; j<8; j++) |
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✓✓ |
47892528 |
for (i=0; i<8; i++) |
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42571136 |
dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add); |
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665174 |
} |
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665174 |
static inline void comp_block(MadContext *t, AVFrame *frame, |
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int mb_x, int mb_y, |
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int j, int mv_x, int mv_y, int add) |
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{ |
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✓✓ |
665174 |
if (j < 4) { |
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437978 |
unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x; |
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✗✓ |
437978 |
if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7) |
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return; |
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437978 |
comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), |
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437978 |
frame->linesize[0], |
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437978 |
t->last_frame->data[0] + offset, |
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437978 |
t->last_frame->linesize[0], add); |
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✓✗ |
227196 |
} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
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227196 |
int index = j - 3; |
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227196 |
unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2); |
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✗✓ |
227196 |
if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7) |
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return; |
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227196 |
comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8, |
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227196 |
frame->linesize[index], |
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227196 |
t->last_frame->data[index] + offset, |
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227196 |
t->last_frame->linesize[index], add); |
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} |
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} |
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158158 |
static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block, |
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int mb_x, int mb_y, int j) |
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{ |
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✓✓ |
158158 |
if (j < 4) { |
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110910 |
ff_ea_idct_put_c( |
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110910 |
frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3), |
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110910 |
frame->linesize[0], block); |
123 |
✓✗ |
47248 |
} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
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47248 |
int index = j - 3; |
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47248 |
ff_ea_idct_put_c( |
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47248 |
frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8, |
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47248 |
frame->linesize[index], block); |
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} |
129 |
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158158 |
} |
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158158 |
static inline int decode_block_intra(MadContext *s, int16_t * block) |
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{ |
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int level, i, j, run; |
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158158 |
RLTable *rl = &ff_rl_mpeg1; |
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158158 |
const uint8_t *scantable = s->scantable.permutated; |
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158158 |
int16_t *quant_matrix = s->quant_matrix; |
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138 |
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158158 |
block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0]; |
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/* The RL decoder is derived from mpeg1_decode_block_intra; |
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Escaped level and run values a decoded differently */ |
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158158 |
i = 0; |
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{ |
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158158 |
OPEN_READER(re, &s->gb); |
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/* now quantify & encode AC coefficients */ |
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for (;;) { |
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1112218 |
UPDATE_CACHE(re, &s->gb); |
148 |
✓✓ |
1112218 |
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); |
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150 |
✓✓ |
1112218 |
if (level == 127) { |
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158158 |
break; |
152 |
✓✓ |
954060 |
} else if (level != 0) { |
153 |
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913987 |
i += run; |
154 |
✗✓ |
913987 |
if (i > 63) { |
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av_log(s->avctx, AV_LOG_ERROR, |
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"ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); |
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return -1; |
158 |
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} |
159 |
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913987 |
j = scantable[i]; |
160 |
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913987 |
level = (level*quant_matrix[j]) >> 4; |
161 |
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913987 |
level = (level-1)|1; |
162 |
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913987 |
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); |
163 |
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913987 |
LAST_SKIP_BITS(re, &s->gb, 1); |
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} else { |
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/* escape */ |
166 |
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40073 |
UPDATE_CACHE(re, &s->gb); |
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40073 |
level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10); |
168 |
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169 |
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40073 |
UPDATE_CACHE(re, &s->gb); |
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40073 |
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); |
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172 |
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40073 |
i += run; |
173 |
✗✓ |
40073 |
if (i > 63) { |
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av_log(s->avctx, AV_LOG_ERROR, |
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"ac-tex damaged at %d %d\n", s->mb_x, s->mb_y); |
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return -1; |
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} |
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40073 |
j = scantable[i]; |
179 |
✓✓ |
40073 |
if (level < 0) { |
180 |
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20920 |
level = -level; |
181 |
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20920 |
level = (level*quant_matrix[j]) >> 4; |
182 |
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20920 |
level = (level-1)|1; |
183 |
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20920 |
level = -level; |
184 |
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} else { |
185 |
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19153 |
level = (level*quant_matrix[j]) >> 4; |
186 |
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19153 |
level = (level-1)|1; |
187 |
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} |
188 |
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} |
189 |
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190 |
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954060 |
block[j] = level; |
191 |
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} |
192 |
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158158 |
CLOSE_READER(re, &s->gb); |
193 |
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} |
194 |
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158158 |
return 0; |
195 |
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} |
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197 |
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897656 |
static int decode_motion(GetBitContext *gb) |
198 |
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{ |
199 |
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897656 |
int value = 0; |
200 |
✓✓ |
897656 |
if (get_bits1(gb)) { |
201 |
✓✓ |
300433 |
if (get_bits1(gb)) |
202 |
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163614 |
value = -17; |
203 |
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300433 |
value += get_bits(gb, 4) + 1; |
204 |
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} |
205 |
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897656 |
return value; |
206 |
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} |
207 |
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208 |
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137222 |
static int decode_mb(MadContext *s, AVFrame *frame, int inter) |
209 |
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{ |
210 |
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137222 |
int mv_map = 0; |
211 |
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137222 |
int av_uninit(mv_x), av_uninit(mv_y); |
212 |
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int j; |
213 |
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|
214 |
✓✓ |
137222 |
if (inter) { |
215 |
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119970 |
int v = decode210(&s->gb); |
216 |
✓✓ |
119970 |
if (v < 2) { |
217 |
✓✓ |
116241 |
mv_map = v ? get_bits(&s->gb, 6) : 63; |
218 |
|
116241 |
mv_x = decode_motion(&s->gb); |
219 |
|
116241 |
mv_y = decode_motion(&s->gb); |
220 |
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} |
221 |
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} |
222 |
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|
223 |
✓✓ |
960554 |
for (j=0; j<6; j++) { |
224 |
✓✓ |
823332 |
if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map |
225 |
|
665174 |
int add = 2*decode_motion(&s->gb); |
226 |
✓✗ |
665174 |
if (s->last_frame->data[0]) |
227 |
|
665174 |
comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add); |
228 |
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} else { |
229 |
|
158158 |
s->bdsp.clear_block(s->block); |
230 |
✗✓ |
158158 |
if(decode_block_intra(s, s->block) < 0) |
231 |
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return -1; |
232 |
|
158158 |
idct_put(s, frame, s->block, s->mb_x, s->mb_y, j); |
233 |
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} |
234 |
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} |
235 |
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137222 |
return 0; |
236 |
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} |
237 |
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238 |
|
99 |
static void calc_quant_matrix(MadContext *s, int qscale) |
239 |
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{ |
240 |
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int i; |
241 |
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242 |
|
99 |
s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11; |
243 |
✓✓ |
6336 |
for (i=1; i<64; i++) |
244 |
|
6237 |
s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10; |
245 |
|
99 |
} |
246 |
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247 |
|
99 |
static int decode_frame(AVCodecContext *avctx, |
248 |
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void *data, int *got_frame, |
249 |
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AVPacket *avpkt) |
250 |
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{ |
251 |
|
99 |
const uint8_t *buf = avpkt->data; |
252 |
|
99 |
int buf_size = avpkt->size; |
253 |
|
99 |
MadContext *s = avctx->priv_data; |
254 |
|
99 |
AVFrame *frame = data; |
255 |
|
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GetByteContext gb; |
256 |
|
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int width, height; |
257 |
|
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int chunk_type; |
258 |
|
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int inter, ret; |
259 |
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|
260 |
|
99 |
bytestream2_init(&gb, buf, buf_size); |
261 |
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|
262 |
|
99 |
chunk_type = bytestream2_get_le32(&gb); |
263 |
✓✓✓✓
|
99 |
inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG); |
264 |
|
99 |
bytestream2_skip(&gb, 10); |
265 |
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|
266 |
|
99 |
av_reduce(&avctx->framerate.den, &avctx->framerate.num, |
267 |
|
99 |
bytestream2_get_le16(&gb), 1000, 1<<30); |
268 |
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|
269 |
|
99 |
width = bytestream2_get_le16(&gb); |
270 |
|
99 |
height = bytestream2_get_le16(&gb); |
271 |
|
99 |
bytestream2_skip(&gb, 1); |
272 |
|
99 |
calc_quant_matrix(s, bytestream2_get_byte(&gb)); |
273 |
|
99 |
bytestream2_skip(&gb, 2); |
274 |
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|
275 |
✗✓ |
99 |
if (bytestream2_get_bytes_left(&gb) < 2) { |
276 |
|
|
av_log(avctx, AV_LOG_ERROR, "Input data too small\n"); |
277 |
|
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return AVERROR_INVALIDDATA; |
278 |
|
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} |
279 |
|
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|
280 |
✓✗✗✓
|
99 |
if (width < 16 || height < 16) { |
281 |
|
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av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n"); |
282 |
|
|
return AVERROR_INVALIDDATA; |
283 |
|
|
} |
284 |
|
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|
285 |
✓✓✗✓
|
99 |
if (avctx->width != width || avctx->height != height) { |
286 |
|
3 |
av_frame_unref(s->last_frame); |
287 |
✗✓ |
3 |
if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb)) |
288 |
|
|
return AVERROR_INVALIDDATA; |
289 |
✗✓ |
3 |
if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
290 |
|
|
return ret; |
291 |
|
|
} |
292 |
|
|
|
293 |
✗✓ |
99 |
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
294 |
|
|
return ret; |
295 |
|
|
|
296 |
✓✓✗✓
|
99 |
if (inter && !s->last_frame->data[0]) { |
297 |
|
|
av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n"); |
298 |
|
|
ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF); |
299 |
|
|
if (ret < 0) |
300 |
|
|
return ret; |
301 |
|
|
memset(s->last_frame->data[0], 0, s->last_frame->height * |
302 |
|
|
s->last_frame->linesize[0]); |
303 |
|
|
memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 * |
304 |
|
|
s->last_frame->linesize[1]); |
305 |
|
|
memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 * |
306 |
|
|
s->last_frame->linesize[2]); |
307 |
|
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} |
308 |
|
|
|
309 |
|
99 |
av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, |
310 |
|
99 |
bytestream2_get_bytes_left(&gb)); |
311 |
✗✓ |
99 |
if (!s->bitstream_buf) |
312 |
|
|
return AVERROR(ENOMEM); |
313 |
|
99 |
s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)), |
314 |
|
99 |
bytestream2_get_bytes_left(&gb) / 2); |
315 |
|
99 |
memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE); |
316 |
|
99 |
init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb))); |
317 |
|
|
|
318 |
✓✓ |
3153 |
for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++) |
319 |
✓✓ |
140276 |
for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++) |
320 |
✗✓ |
137222 |
if(decode_mb(s, frame, inter) < 0) |
321 |
|
|
return AVERROR_INVALIDDATA; |
322 |
|
|
|
323 |
|
99 |
*got_frame = 1; |
324 |
|
|
|
325 |
✓✓ |
99 |
if (chunk_type != MADe_TAG) { |
326 |
|
51 |
av_frame_unref(s->last_frame); |
327 |
✗✓ |
51 |
if ((ret = av_frame_ref(s->last_frame, frame)) < 0) |
328 |
|
|
return ret; |
329 |
|
|
} |
330 |
|
|
|
331 |
|
99 |
return buf_size; |
332 |
|
|
} |
333 |
|
|
|
334 |
|
4 |
static av_cold int decode_end(AVCodecContext *avctx) |
335 |
|
|
{ |
336 |
|
4 |
MadContext *t = avctx->priv_data; |
337 |
|
4 |
av_frame_free(&t->last_frame); |
338 |
|
4 |
av_freep(&t->bitstream_buf); |
339 |
|
4 |
return 0; |
340 |
|
|
} |
341 |
|
|
|
342 |
|
|
AVCodec ff_eamad_decoder = { |
343 |
|
|
.name = "eamad", |
344 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"), |
345 |
|
|
.type = AVMEDIA_TYPE_VIDEO, |
346 |
|
|
.id = AV_CODEC_ID_MAD, |
347 |
|
|
.priv_data_size = sizeof(MadContext), |
348 |
|
|
.init = decode_init, |
349 |
|
|
.close = decode_end, |
350 |
|
|
.decode = decode_frame, |
351 |
|
|
.capabilities = AV_CODEC_CAP_DR1, |
352 |
|
|
}; |