PSX MDEC decoder, based upon some code from Sebastian Jedruszkiewicz <elf at frogger dot rules dot pl>
note: completly untested, no demuxer yet Originally committed as revision 2134 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Michael Niedermayer
22 years ago
parent
a6aec9c94f
commit
c3bf0288c9
5 changed files with 315 additions and 14 deletions
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/*
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* PSX MDEC codec |
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* Copyright (c) 2003 Michael Niedermayer |
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* |
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* This library 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 of the License, or (at your option) any later version. |
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* |
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* This library 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 this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl> |
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*/ |
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/**
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* @file mdec.c |
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* PSX MDEC codec. |
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* This is very similar to intra only MPEG1. |
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*/ |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "mpegvideo.h" |
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//#undef NDEBUG
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//#include <assert.h>
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typedef struct MDECContext{ |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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AVFrame picture; |
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PutBitContext pb; |
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GetBitContext gb; |
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ScanTable scantable; |
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int version; |
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int qscale; |
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int last_dc[3]; |
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int mb_width; |
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int mb_height; |
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int mb_x, mb_y; |
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DCTELEM __align8 block[6][64]; |
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uint16_t __align8 intra_matrix[64]; |
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int __align8 q_intra_matrix[64]; |
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uint8_t *bitstream_buffer; |
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int bitstream_buffer_size; |
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int block_last_index[6]; |
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} MDECContext; |
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//very similar to mpeg1
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static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n) |
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{ |
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int level, diff, i, j, run; |
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int component; |
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RLTable *rl = &rl_mpeg1; |
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uint8_t * const scantable= a->scantable.permutated; |
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const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix; |
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const int qscale= a->qscale; |
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/* DC coef */ |
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if(a->version==2){ |
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block[0]= get_sbits(&a->gb, 11); |
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}else{ |
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component = (n <= 3 ? 0 : n - 4 + 1); |
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diff = decode_dc(&a->gb, component); |
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if (diff >= 0xffff) |
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return -1; |
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a->last_dc[component]+= diff; |
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block[0] = a->last_dc[component]<<3; |
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} |
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i = 0; |
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{ |
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OPEN_READER(re, &a->gb);
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/* now quantify & encode AC coefs */ |
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for(;;) { |
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UPDATE_CACHE(re, &a->gb); |
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GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2); |
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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*qscale*quant_matrix[j])>>3; |
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level= (level-1)|1; |
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level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1); |
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LAST_SKIP_BITS(re, &a->gb, 1); |
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} else { |
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/* escape */ |
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run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6); |
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UPDATE_CACHE(re, &a->gb); |
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level = SHOW_SBITS(re, &a->gb, 8); SKIP_BITS(re, &a->gb, 8); |
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if (level == -128) { |
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level = SHOW_UBITS(re, &a->gb, 8) - 256; LAST_SKIP_BITS(re, &a->gb, 8); |
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} else if (level == 0) { |
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level = SHOW_UBITS(re, &a->gb, 8) ; LAST_SKIP_BITS(re, &a->gb, 8); |
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} |
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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*qscale*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*qscale*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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fprintf(stderr, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y); |
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return -1; |
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} |
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block[j] = level; |
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} |
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CLOSE_READER(re, &a->gb); |
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} |
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a->block_last_index[n] = i; |
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return 0; |
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} |
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static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){ |
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int i; |
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a->dsp.clear_blocks(block[0]); |
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for(i=5; i>=0; i--){ |
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if( mdec_decode_block_intra(a, block[i], i) < 0)
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return -1; |
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} |
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return 0; |
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} |
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static inline void idct_put(MDECContext *a, int mb_x, int mb_y){ |
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DCTELEM (*block)[64]= a->block; |
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int linesize= a->picture.linesize[0]; |
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uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16; |
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uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8; |
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uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8; |
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a->dsp.idct_put(dest_y , linesize, block[0]); |
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a->dsp.idct_put(dest_y + 8, linesize, block[1]); |
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a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]); |
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a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]); |
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if(!(a->avctx->flags&CODEC_FLAG_GRAY)){ |
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a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]); |
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a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]); |
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} |
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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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uint8_t *buf, int buf_size) |
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{ |
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MDECContext * const a = avctx->priv_data; |
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AVFrame *picture = data; |
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AVFrame * const p= (AVFrame*)&a->picture; |
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int i; |
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*data_size = 0; |
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/* special case for last picture */ |
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if (buf_size == 0) { |
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return 0; |
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} |
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if(p->data[0]) |
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avctx->release_buffer(avctx, p); |
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p->reference= 0; |
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if(avctx->get_buffer(avctx, p) < 0){ |
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fprintf(stderr, "get_buffer() failed\n"); |
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return -1; |
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} |
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p->pict_type= I_TYPE; |
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p->key_frame= 1; |
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a->last_dc[0]= |
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a->last_dc[1]= |
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a->last_dc[2]= 0; |
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a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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for(i=0; 2*i<buf_size; i+=2){ |
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((uint16_t*)a->bitstream_buffer)[i] = ((uint16_t*)buf)[i+1]; |
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((uint16_t*)a->bitstream_buffer)[i+1]= ((uint16_t*)buf)[i ]; |
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} |
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// a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (uint32_t*)buf, buf_size/4);
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init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8); |
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a->qscale= get_bits(&a->gb, 16); |
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a->version= get_bits(&a->gb, 16); |
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skip_bits(&a->gb, 8*8);
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printf("qscale:%d, version:%d\n", a->qscale, a->version); |
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for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){ |
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for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){ |
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if( decode_mb(a, a->block) <0) |
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return -1; |
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idct_put(a, a->mb_x, a->mb_y); |
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} |
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} |
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#if 0
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int i; |
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printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb)); |
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for(i=get_bits_count(&a->gb); i<8*buf_size; i++){ |
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printf("%d", get_bits1(&a->gb)); |
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} |
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for(i=0; i<s->avctx->extradata_size; i++){ |
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printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]); |
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} |
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#endif |
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// p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
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// memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
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*picture= *(AVFrame*)&a->picture; |
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*data_size = sizeof(AVPicture); |
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emms_c(); |
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return (get_bits_count(&a->gb)+31)/32*4; |
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} |
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static void mdec_common_init(AVCodecContext *avctx){ |
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MDECContext * const a = avctx->priv_data; |
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dsputil_init(&a->dsp, avctx); |
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a->mb_width = (avctx->width + 15) / 16; |
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a->mb_height = (avctx->height + 15) / 16; |
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avctx->coded_frame= (AVFrame*)&a->picture; |
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a->avctx= avctx; |
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} |
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static int decode_init(AVCodecContext *avctx){ |
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MDECContext * const a = avctx->priv_data; |
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AVFrame *p= (AVFrame*)&a->picture; |
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int i; |
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mdec_common_init(avctx); |
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init_vlcs(); |
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ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct); |
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/*
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for(i=0; i<64; i++){ |
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int index= ff_zigzag_direct[i]; |
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a->intra_matrix[i]= 64*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale; |
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} |
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*/ |
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p->qstride= a->mb_width; |
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p->qscale_table= av_mallocz( p->qstride * a->mb_height); |
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return 0; |
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} |
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static int decode_end(AVCodecContext *avctx){ |
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MDECContext * const a = avctx->priv_data; |
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av_freep(&a->bitstream_buffer); |
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av_freep(&a->picture.qscale_table); |
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a->bitstream_buffer_size=0; |
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avcodec_default_free_buffers(avctx); |
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return 0; |
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} |
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AVCodec mdec_decoder = { |
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"mdec", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_MDEC, |
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sizeof(MDECContext), |
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decode_init, |
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NULL, |
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decode_end, |
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decode_frame, |
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CODEC_CAP_DR1, |
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}; |
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