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257 lines
8.1 KiB
257 lines
8.1 KiB
/* |
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* Electronic Arts TGQ Video Decoder |
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* Copyright (c) 2007-2008 Peter Ross <pross@xvid.org> |
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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 TGQ Video Decoder |
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* @author Peter Ross <pross@xvid.org> |
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* |
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* Technical details here: |
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ |
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*/ |
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#include "avcodec.h" |
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#define ALT_BITSTREAM_READER_LE |
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#include "get_bits.h" |
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#include "bytestream.h" |
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#include "dsputil.h" |
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#include "aandcttab.h" |
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typedef struct TgqContext { |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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AVFrame frame; |
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int width,height; |
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ScanTable scantable; |
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int qtable[64]; |
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DECLARE_ALIGNED(16, DCTELEM, block)[6][64]; |
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} TgqContext; |
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static av_cold int tgq_decode_init(AVCodecContext *avctx){ |
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TgqContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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if(avctx->idct_algo==FF_IDCT_AUTO) |
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avctx->idct_algo=FF_IDCT_EA; |
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dsputil_init(&s->dsp, avctx); |
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ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); |
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avctx->time_base = (AVRational){1, 15}; |
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avctx->pix_fmt = PIX_FMT_YUV420P; |
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return 0; |
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} |
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static void tgq_decode_block(TgqContext *s, DCTELEM block[64], GetBitContext *gb){ |
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uint8_t *perm = s->scantable.permutated; |
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int i,j,value; |
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block[0] = get_sbits(gb,8) * s->qtable[0]; |
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for(i=1; i<64; ) { |
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switch(show_bits(gb,3)) { |
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case 4: |
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block[perm[i++]] = 0; |
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case 0: |
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block[perm[i++]] = 0; |
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skip_bits(gb,3); |
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break; |
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case 5: |
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case 1: |
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skip_bits(gb,2); |
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value = get_bits(gb,6); |
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for(j=0; j<value; j++) |
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block[perm[i++]] = 0; |
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break; |
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case 6: |
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skip_bits(gb,3); |
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block[perm[i]] = -s->qtable[perm[i]]; |
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i++; |
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break; |
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case 2: |
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skip_bits(gb,3); |
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block[perm[i]] = s->qtable[perm[i]]; |
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i++; |
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break; |
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case 7: // 111b |
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case 3: // 011b |
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skip_bits(gb,2); |
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if (show_bits(gb,6)==0x3F) { |
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skip_bits(gb, 6); |
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block[perm[i]] = get_sbits(gb,8)*s->qtable[perm[i]]; |
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}else{ |
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block[perm[i]] = get_sbits(gb,6)*s->qtable[perm[i]]; |
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} |
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i++; |
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break; |
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} |
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} |
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block[0] += 128<<4; |
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} |
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static void tgq_idct_put_mb(TgqContext *s, DCTELEM (*block)[64], int mb_x, int mb_y){ |
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int linesize= s->frame.linesize[0]; |
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uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
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uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; |
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uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; |
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s->dsp.idct_put(dest_y , linesize, block[0]); |
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s->dsp.idct_put(dest_y + 8, linesize, block[1]); |
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s->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); |
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s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); |
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if(!(s->avctx->flags&CODEC_FLAG_GRAY)){ |
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s->dsp.idct_put(dest_cb, s->frame.linesize[1], block[4]); |
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s->dsp.idct_put(dest_cr, s->frame.linesize[2], block[5]); |
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} |
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} |
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static inline void tgq_dconly(TgqContext *s, unsigned char *dst, int dst_stride, int dc){ |
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int level = av_clip_uint8((dc*s->qtable[0] + 2056)>>4); |
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int j; |
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for(j=0;j<8;j++) |
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memset(dst+j*dst_stride, level, 8); |
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} |
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static void tgq_idct_put_mb_dconly(TgqContext *s, int mb_x, int mb_y, const int8_t *dc) |
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{ |
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int linesize= s->frame.linesize[0]; |
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uint8_t *dest_y = s->frame.data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
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uint8_t *dest_cb = s->frame.data[1] + (mb_y * 8 * s->frame.linesize[1]) + mb_x * 8; |
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uint8_t *dest_cr = s->frame.data[2] + (mb_y * 8 * s->frame.linesize[2]) + mb_x * 8; |
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tgq_dconly(s,dest_y , linesize, dc[0]); |
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tgq_dconly(s,dest_y + 8, linesize, dc[1]); |
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tgq_dconly(s,dest_y + 8*linesize , linesize, dc[2]); |
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tgq_dconly(s,dest_y + 8*linesize + 8, linesize, dc[3]); |
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if(!(s->avctx->flags&CODEC_FLAG_GRAY)) { |
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tgq_dconly(s,dest_cb, s->frame.linesize[1], dc[4]); |
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tgq_dconly(s,dest_cr, s->frame.linesize[2], dc[5]); |
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} |
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} |
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static void tgq_decode_mb(TgqContext *s, int mb_y, int mb_x, const uint8_t **bs, const uint8_t *buf_end){ |
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int mode; |
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int i; |
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int8_t dc[6]; |
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mode = bytestream_get_byte(bs); |
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if (mode>buf_end-*bs) { |
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av_log(s->avctx, AV_LOG_ERROR, "truncated macroblock\n"); |
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return; |
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} |
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if (mode>12) { |
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GetBitContext gb; |
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init_get_bits(&gb, *bs, mode*8); |
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for(i=0; i<6; i++) |
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tgq_decode_block(s, s->block[i], &gb); |
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tgq_idct_put_mb(s, s->block, mb_x, mb_y); |
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}else{ |
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if (mode==3) { |
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memset(dc, (*bs)[0], 4); |
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dc[4] = (*bs)[1]; |
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dc[5] = (*bs)[2]; |
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}else if (mode==6) { |
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memcpy(dc, *bs, 6); |
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}else if (mode==12) { |
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for(i=0; i<6; i++) |
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dc[i] = (*bs)[i*2]; |
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}else{ |
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av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode); |
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} |
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tgq_idct_put_mb_dconly(s, mb_x, mb_y, dc); |
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} |
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*bs += mode; |
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} |
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static void tgq_calculate_qtable(TgqContext *s, int quant){ |
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int i,j; |
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const int a = (14*(100-quant))/100 + 1; |
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const int b = (11*(100-quant))/100 + 4; |
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for(j=0;j<8;j++) |
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for(i=0;i<8;i++) |
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if (s->avctx->idct_algo==FF_IDCT_EA) |
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s->qtable[j*8+i] = ((a*(j+i)/(7+7) + b)*ff_inv_aanscales[j*8+i])>>(14-4); |
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else |
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s->qtable[j*8+i] = (a*(j+i)/(7+7) + b)<<3; |
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} |
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static int tgq_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt){ |
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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_start = buf; |
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const uint8_t *buf_end = buf + buf_size; |
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TgqContext *s = avctx->priv_data; |
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int x,y; |
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int big_endian = AV_RL32(&buf[4]) > 0x000FFFFF; |
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buf += 8; |
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if(8>buf_end-buf) { |
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av_log(avctx, AV_LOG_WARNING, "truncated header\n"); |
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return -1; |
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} |
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s->width = big_endian ? AV_RB16(&buf[0]) : AV_RL16(&buf[0]); |
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s->height = big_endian ? AV_RB16(&buf[2]) : AV_RL16(&buf[2]); |
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if (s->avctx->width!=s->width || s->avctx->height!=s->height) { |
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avcodec_set_dimensions(s->avctx, s->width, s->height); |
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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &s->frame); |
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} |
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tgq_calculate_qtable(s, buf[4]); |
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buf += 8; |
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if (!s->frame.data[0]) { |
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s->frame.key_frame = 1; |
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s->frame.pict_type = AV_PICTURE_TYPE_I; |
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID; |
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if (avctx->get_buffer(avctx, &s->frame)) { |
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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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for (y=0; y<(avctx->height+15)/16; y++) |
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for (x=0; x<(avctx->width+15)/16; x++) |
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tgq_decode_mb(s, y, x, &buf, buf_end); |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = s->frame; |
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return buf-buf_start; |
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} |
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static av_cold int tgq_decode_end(AVCodecContext *avctx){ |
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TgqContext *s = avctx->priv_data; |
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if (s->frame.data[0]) |
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s->avctx->release_buffer(avctx, &s->frame); |
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return 0; |
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} |
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AVCodec ff_eatgq_decoder = { |
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"eatgq", |
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AVMEDIA_TYPE_VIDEO, |
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CODEC_ID_TGQ, |
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sizeof(TgqContext), |
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tgq_decode_init, |
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NULL, |
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tgq_decode_end, |
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tgq_decode_frame, |
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CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"), |
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};
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