2009-06-13 05:19:41 +03:00
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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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2010-04-20 17:45:34 +03:00
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* @file
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2009-06-13 05:19:41 +03:00
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* Electronic Arts Madcow Video Decoder
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2011-10-30 21:10:50 +03:00
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* @author Peter Ross <pross@xvid.org>
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2009-06-13 05:19:41 +03:00
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*
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2011-10-30 21:10:50 +03:00
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* @see technical details at
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2009-06-13 05:19:41 +03:00
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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 "get_bits.h"
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#include "dsputil.h"
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#include "aandcttab.h"
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2012-07-29 15:09:10 +03:00
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#include "eaidct.h"
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2009-06-13 05:19:41 +03:00
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#include "mpeg12.h"
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#include "mpeg12data.h"
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2011-02-07 15:37:08 +02:00
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#include "libavutil/imgutils.h"
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2009-06-13 05:19:41 +03:00
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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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2012-07-27 19:00:38 +03:00
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AVCodecContext *avctx;
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DSPContext dsp;
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2009-06-13 05:19:41 +03:00
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AVFrame frame;
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AVFrame last_frame;
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2012-07-27 19:00:38 +03:00
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GetBitContext gb;
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2009-06-13 05:19:41 +03:00
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void *bitstream_buf;
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unsigned int bitstream_buf_size;
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2010-03-06 16:24:59 +02:00
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DECLARE_ALIGNED(16, DCTELEM, block)[64];
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2012-07-27 19:00:38 +03:00
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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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2009-06-13 05:19:41 +03:00
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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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2012-07-27 19:00:38 +03:00
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MadContext *s = avctx->priv_data;
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2009-06-13 05:19:41 +03:00
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_YUV420P;
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2012-02-15 13:06:44 +03:00
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ff_dsputil_init(&s->dsp, avctx);
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2012-07-29 15:09:10 +03:00
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ff_init_scantable_permutation(s->dsp.idct_permutation, FF_NO_IDCT_PERM);
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2012-07-27 19:00:38 +03:00
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ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
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2009-06-13 05:19:41 +03:00
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ff_mpeg12_init_vlcs();
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return 0;
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}
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static inline void comp(unsigned char *dst, int dst_stride,
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unsigned char *src, int src_stride, int add)
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{
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int j, i;
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for (j=0; j<8; j++)
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for (i=0; i<8; i++)
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dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
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}
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static inline void comp_block(MadContext *t, 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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if (j < 4) {
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2011-10-09 00:40:31 +03:00
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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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2012-07-31 00:04:28 +03:00
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if (offset >= (t->avctx->height - 7) * t->last_frame.linesize[0] - 7)
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2011-10-09 00:40:31 +03:00
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return;
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2009-06-13 05:19:41 +03:00
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comp(t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
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t->frame.linesize[0],
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2011-10-09 00:40:31 +03:00
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t->last_frame.data[0] + offset,
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2009-06-13 05:19:41 +03:00
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t->last_frame.linesize[0], add);
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2012-07-27 19:00:38 +03:00
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} else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
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2009-06-13 05:19:41 +03:00
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int index = j - 3;
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2011-10-09 00:40:31 +03:00
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unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame.linesize[index] + mb_x * 8 + (mv_x/2);
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2012-07-31 00:04:28 +03:00
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if (offset >= (t->avctx->height/2 - 7) * t->last_frame.linesize[index] - 7)
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2011-10-09 00:40:31 +03:00
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return;
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2009-06-13 05:19:41 +03:00
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comp(t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x * 8,
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t->frame.linesize[index],
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2011-10-09 00:40:31 +03:00
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t->last_frame.data[index] + offset,
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2009-06-13 05:19:41 +03:00
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t->last_frame.linesize[index], add);
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}
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}
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static inline void idct_put(MadContext *t, DCTELEM *block, int mb_x, int mb_y, int j)
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{
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if (j < 4) {
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2012-07-29 15:09:10 +03:00
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ff_ea_idct_put_c(
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2009-06-13 05:19:41 +03:00
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t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
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t->frame.linesize[0], block);
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2012-07-27 19:00:38 +03:00
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} else if (!(t->avctx->flags & CODEC_FLAG_GRAY)) {
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2009-06-13 05:19:41 +03:00
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int index = j - 3;
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2012-07-29 15:09:10 +03:00
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ff_ea_idct_put_c(
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2009-06-13 05:19:41 +03:00
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t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x*8,
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t->frame.linesize[index], block);
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}
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}
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2012-07-31 00:04:28 +03:00
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static inline int decode_block_intra(MadContext *s, DCTELEM * block)
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2009-06-13 05:19:41 +03:00
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{
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int level, i, j, run;
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RLTable *rl = &ff_rl_mpeg1;
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2012-07-27 19:00:38 +03:00
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const uint8_t *scantable = s->scantable.permutated;
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int16_t *quant_matrix = s->quant_matrix;
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2009-06-13 05:19:41 +03:00
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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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2009-06-14 12:55:28 +03:00
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i = 0;
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2009-06-13 05:19:41 +03:00
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{
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OPEN_READER(re, &s->gb);
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/* now quantify & encode AC coefficients */
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for (;;) {
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UPDATE_CACHE(re, &s->gb);
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GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
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if (level == 127) {
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break;
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} else if (level != 0) {
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i += run;
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j = scantable[i];
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
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LAST_SKIP_BITS(re, &s->gb, 1);
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} else {
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/* escape */
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UPDATE_CACHE(re, &s->gb);
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level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
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UPDATE_CACHE(re, &s->gb);
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run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
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i += run;
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j = scantable[i];
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if (level < 0) {
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level = -level;
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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level = -level;
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} else {
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level = (level*quant_matrix[j]) >> 4;
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level = (level-1)|1;
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}
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}
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if (i > 63) {
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av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
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2011-12-19 18:30:30 +03:00
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return -1;
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2009-06-13 05:19:41 +03:00
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}
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block[j] = level;
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}
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CLOSE_READER(re, &s->gb);
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}
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2011-12-19 18:30:30 +03:00
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return 0;
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2009-06-13 05:19:41 +03:00
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}
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static int decode_motion(GetBitContext *gb)
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{
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int value = 0;
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if (get_bits1(gb)) {
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if (get_bits1(gb))
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value = -17;
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value += get_bits(gb, 4) + 1;
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}
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return value;
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}
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2012-07-31 00:04:28 +03:00
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static int decode_mb(MadContext *s, int inter)
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2009-06-13 05:19:41 +03:00
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{
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int mv_map = 0;
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int mv_x, mv_y;
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int j;
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if (inter) {
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int v = decode210(&s->gb);
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if (v < 2) {
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mv_map = v ? get_bits(&s->gb, 6) : 63;
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mv_x = decode_motion(&s->gb);
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mv_y = decode_motion(&s->gb);
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}
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}
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for (j=0; j<6; j++) {
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if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
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int add = 2*decode_motion(&s->gb);
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2012-07-31 00:04:28 +03:00
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if (s->last_frame.data[0])
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comp_block(s, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
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2009-06-13 05:19:41 +03:00
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} else {
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2012-07-27 19:00:38 +03:00
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s->dsp.clear_block(s->block);
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2012-07-31 00:04:28 +03:00
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if(decode_block_intra(s, s->block) < 0)
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2011-12-19 18:30:30 +03:00
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return -1;
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2012-07-27 19:00:38 +03:00
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idct_put(s, s->block, s->mb_x, s->mb_y, j);
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2009-06-13 05:19:41 +03:00
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}
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}
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2011-12-19 18:30:30 +03:00
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return 0;
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2009-06-13 05:19:41 +03:00
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}
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2012-07-27 19:00:38 +03:00
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static void calc_quant_matrix(MadContext *s, int qscale)
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2009-06-13 05:19:41 +03:00
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{
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int i;
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2012-07-29 15:09:10 +03:00
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s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
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for (i=1; i<64; i++)
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s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
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2009-06-13 05:19:41 +03:00
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf+buf_size;
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2012-07-27 19:00:38 +03:00
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MadContext *s = avctx->priv_data;
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int width, height;
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2009-06-13 05:19:41 +03:00
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int chunk_type;
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int inter;
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if (buf_size < 17) {
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av_log(avctx, AV_LOG_ERROR, "Input buffer too small\n");
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*data_size = 0;
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return -1;
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}
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chunk_type = AV_RL32(&buf[0]);
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inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
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buf += 8;
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av_reduce(&avctx->time_base.num, &avctx->time_base.den,
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AV_RL16(&buf[6]), 1000, 1<<30);
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2012-07-27 19:00:38 +03:00
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width = AV_RL16(&buf[8]);
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height = AV_RL16(&buf[10]);
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calc_quant_matrix(s, buf[13]);
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2009-06-13 05:19:41 +03:00
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buf += 16;
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2012-07-27 19:00:38 +03:00
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if (avctx->width != width || avctx->height != height) {
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2012-07-31 00:04:28 +03:00
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if((width * height)/2048*7 > buf_end-buf)
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2011-12-19 18:27:52 +03:00
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return -1;
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2012-07-27 19:00:38 +03:00
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if (av_image_check_size(width, height, 0, avctx) < 0)
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2009-06-13 05:19:41 +03:00
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return -1;
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2012-07-27 19:00:38 +03:00
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avcodec_set_dimensions(avctx, width, height);
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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2012-07-31 00:04:28 +03:00
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if (s->last_frame.data[0])
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avctx->release_buffer(avctx, &s->last_frame);
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2009-06-13 05:19:41 +03:00
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}
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2012-07-31 00:04:28 +03:00
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s->frame.reference = 3;
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2012-07-27 19:00:38 +03:00
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if (!s->frame.data[0]) {
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if (avctx->get_buffer(avctx, &s->frame) < 0) {
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2009-06-13 05:19:41 +03:00
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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}
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2012-07-27 19:00:38 +03:00
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av_fast_malloc(&s->bitstream_buf, &s->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!s->bitstream_buf)
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2009-06-13 05:19:41 +03:00
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return AVERROR(ENOMEM);
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2012-08-01 23:38:10 +03:00
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s->dsp.bswap16_buf(s->bitstream_buf, (const uint16_t*)buf, (buf_end-buf)/2);
|
2012-07-31 00:04:28 +03:00
|
|
|
memset((uint8_t*)s->bitstream_buf + (buf_end-buf), 0, FF_INPUT_BUFFER_PADDING_SIZE);
|
2012-07-27 19:00:38 +03:00
|
|
|
init_get_bits(&s->gb, s->bitstream_buf, 8*(buf_end-buf));
|
2009-06-13 05:19:41 +03:00
|
|
|
|
|
|
|
for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
|
|
|
|
for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
|
2012-07-31 00:04:28 +03:00
|
|
|
if(decode_mb(s, inter) < 0)
|
2011-12-19 18:30:30 +03:00
|
|
|
return -1;
|
2009-06-13 05:19:41 +03:00
|
|
|
|
|
|
|
*data_size = sizeof(AVFrame);
|
2012-07-27 19:00:38 +03:00
|
|
|
*(AVFrame*)data = s->frame;
|
2009-06-13 05:19:41 +03:00
|
|
|
|
|
|
|
if (chunk_type != MADe_TAG)
|
2012-07-27 19:00:38 +03:00
|
|
|
FFSWAP(AVFrame, s->frame, s->last_frame);
|
2009-06-13 05:19:41 +03:00
|
|
|
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
MadContext *t = avctx->priv_data;
|
|
|
|
if (t->frame.data[0])
|
|
|
|
avctx->release_buffer(avctx, &t->frame);
|
|
|
|
if (t->last_frame.data[0])
|
|
|
|
avctx->release_buffer(avctx, &t->last_frame);
|
|
|
|
av_free(t->bitstream_buf);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 23:40:11 +02:00
|
|
|
AVCodec ff_eamad_decoder = {
|
2011-07-17 13:54:31 +03:00
|
|
|
.name = "eamad",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-08-05 12:11:04 +03:00
|
|
|
.id = AV_CODEC_ID_MAD,
|
2011-07-17 13:54:31 +03:00
|
|
|
.priv_data_size = sizeof(MadContext),
|
|
|
|
.init = decode_init,
|
|
|
|
.close = decode_end,
|
|
|
|
.decode = decode_frame,
|
|
|
|
.capabilities = CODEC_CAP_DR1,
|
2012-04-06 19:19:39 +03:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video")
|
2009-06-13 05:19:41 +03:00
|
|
|
};
|