forked from KolibriOS/kolibrios
353 lines
12 KiB
C
353 lines
12 KiB
C
/*
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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(16, 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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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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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, 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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if (j < 4) {
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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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if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
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return;
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comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
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frame->linesize[0],
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t->last_frame->data[0] + offset,
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t->last_frame->linesize[0], add);
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} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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int index = j - 3;
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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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if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
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return;
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comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
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frame->linesize[index],
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t->last_frame->data[index] + offset,
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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, 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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if (j < 4) {
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ff_ea_idct_put_c(
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frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
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frame->linesize[0], block);
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} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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int index = j - 3;
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ff_ea_idct_put_c(
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frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
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frame->linesize[index], block);
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}
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}
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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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RLTable *rl = &ff_rl_mpeg1;
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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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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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i = 0;
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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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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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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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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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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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block[j] = level;
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}
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CLOSE_READER(re, &s->gb);
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}
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return 0;
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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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static int decode_mb(MadContext *s, AVFrame *frame, int inter)
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{
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int mv_map = 0;
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int av_uninit(mv_x), av_uninit(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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if (s->last_frame->data[0])
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comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
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} else {
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s->bdsp.clear_block(s->block);
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if(decode_block_intra(s, s->block) < 0)
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return -1;
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idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
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}
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}
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return 0;
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}
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static void calc_quant_matrix(MadContext *s, int qscale)
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{
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int i;
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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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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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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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MadContext *s = avctx->priv_data;
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AVFrame *frame = data;
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GetByteContext gb;
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int width, height;
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int chunk_type;
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int inter, ret;
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bytestream2_init(&gb, buf, buf_size);
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chunk_type = bytestream2_get_le32(&gb);
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inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
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bytestream2_skip(&gb, 10);
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av_reduce(&avctx->framerate.den, &avctx->framerate.num,
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bytestream2_get_le16(&gb), 1000, 1<<30);
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width = bytestream2_get_le16(&gb);
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height = bytestream2_get_le16(&gb);
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bytestream2_skip(&gb, 1);
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calc_quant_matrix(s, bytestream2_get_byte(&gb));
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bytestream2_skip(&gb, 2);
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if (bytestream2_get_bytes_left(&gb) < 2) {
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av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
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return AVERROR_INVALIDDATA;
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}
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if (width < 16 || height < 16) {
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av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
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return AVERROR_INVALIDDATA;
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}
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if (avctx->width != width || avctx->height != height) {
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av_frame_unref(s->last_frame);
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if((width * height)/2048*7 > bytestream2_get_bytes_left(&gb))
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return AVERROR_INVALIDDATA;
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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}
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if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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if (inter && !s->last_frame->data[0]) {
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av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
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ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
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if (ret < 0)
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return ret;
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memset(s->last_frame->data[0], 0, s->last_frame->height *
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s->last_frame->linesize[0]);
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memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
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s->last_frame->linesize[1]);
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memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
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s->last_frame->linesize[2]);
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}
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av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
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bytestream2_get_bytes_left(&gb));
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if (!s->bitstream_buf)
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return AVERROR(ENOMEM);
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s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
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bytestream2_get_bytes_left(&gb) / 2);
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memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
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init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
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for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
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for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
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if(decode_mb(s, frame, inter) < 0)
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return AVERROR_INVALIDDATA;
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*got_frame = 1;
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if (chunk_type != MADe_TAG) {
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av_frame_unref(s->last_frame);
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if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
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return ret;
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}
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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MadContext *t = avctx->priv_data;
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av_frame_free(&t->last_frame);
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av_freep(&t->bitstream_buf);
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return 0;
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}
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AVCodec ff_eamad_decoder = {
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.name = "eamad",
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MAD,
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.priv_data_size = sizeof(MadContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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