+++ /dev/null
-/*
- * PSX MDEC codec
- * Copyright (c) 2003 Michael Niedermayer
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
- */
-
-/**
- * @file mdec.c
- * PSX MDEC codec.
- * This is very similar to intra only MPEG1.
- */
-
-#include "avcodec.h"
-#include "dsputil.h"
-#include "mpegvideo.h"
-
-//#undef NDEBUG
-//#include <assert.h>
-
-typedef struct MDECContext{
- AVCodecContext *avctx;
- DSPContext dsp;
- AVFrame picture;
- PutBitContext pb;
- GetBitContext gb;
- ScanTable scantable;
- int version;
- int qscale;
- int last_dc[3];
- int mb_width;
- int mb_height;
- int mb_x, mb_y;
- DCTELEM __align8 block[6][64];
- uint16_t __align8 intra_matrix[64];
- int __align8 q_intra_matrix[64];
- uint8_t *bitstream_buffer;
- int bitstream_buffer_size;
- int block_last_index[6];
-} MDECContext;
-
-//very similar to mpeg1
-static inline int mdec_decode_block_intra(MDECContext *a, DCTELEM *block, int n)
-{
- int level, diff, i, j, run;
- int component;
- RLTable *rl = &rl_mpeg1;
- uint8_t * const scantable= a->scantable.permutated;
- const uint16_t *quant_matrix= ff_mpeg1_default_intra_matrix;
- const int qscale= a->qscale;
-
- /* DC coef */
- if(a->version==2){
- block[0]= 2*get_sbits(&a->gb, 10) + 1024;
- }else{
- component = (n <= 3 ? 0 : n - 4 + 1);
- diff = decode_dc(&a->gb, component);
- if (diff >= 0xffff)
- return -1;
- a->last_dc[component]+= diff;
- block[0] = a->last_dc[component]<<3;
- }
-
- i = 0;
- {
- OPEN_READER(re, &a->gb);
- /* now quantify & encode AC coefs */
- for(;;) {
- UPDATE_CACHE(re, &a->gb);
- GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
-
- if(level == 127){
- break;
- } else if(level != 0) {
- i += run;
- j = scantable[i];
- level= (level*qscale*quant_matrix[j])>>3;
-// level= (level-1)|1;
- level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
- LAST_SKIP_BITS(re, &a->gb, 1);
- } else {
- /* escape */
- run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
- UPDATE_CACHE(re, &a->gb);
- level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
- i += run;
- j = scantable[i];
- if(level<0){
- level= -level;
- level= (level*qscale*quant_matrix[j])>>3;
- level= (level-1)|1;
- level= -level;
- }else{
- level= (level*qscale*quant_matrix[j])>>3;
- level= (level-1)|1;
- }
- }
- if (i > 63){
- fprintf(stderr, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
- return -1;
- }
-
- block[j] = level;
- }
- CLOSE_READER(re, &a->gb);
- }
- a->block_last_index[n] = i;
- return 0;
-}
-
-static inline int decode_mb(MDECContext *a, DCTELEM block[6][64]){
- int i;
- const int block_index[6]= {5,4,0,1,2,3};
-
- a->dsp.clear_blocks(block[0]);
-
- for(i=0; i<6; i++){
- if( mdec_decode_block_intra(a, block[ block_index[i] ], block_index[i]) < 0)
- return -1;
- }
- return 0;
-}
-
-static inline void idct_put(MDECContext *a, int mb_x, int mb_y){
- DCTELEM (*block)[64]= a->block;
- int linesize= a->picture.linesize[0];
-
- uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
- uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
- uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
-
- a->dsp.idct_put(dest_y , linesize, block[0]);
- a->dsp.idct_put(dest_y + 8, linesize, block[1]);
- a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
- a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
-
- if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
- a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
- a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
- }
-}
-
-static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- MDECContext * const a = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame * const p= (AVFrame*)&a->picture;
- int i;
-
- *data_size = 0;
-
- /* special case for last picture */
- if (buf_size == 0) {
- return 0;
- }
-
- if(p->data[0])
- avctx->release_buffer(avctx, p);
-
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
- fprintf(stderr, "get_buffer() failed\n");
- return -1;
- }
- p->pict_type= I_TYPE;
- p->key_frame= 1;
- a->last_dc[0]=
- a->last_dc[1]=
- a->last_dc[2]= 0;
-
- a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
- for(i=0; i<buf_size; i+=2){
- a->bitstream_buffer[i] = buf[i+1];
- a->bitstream_buffer[i+1]= buf[i ];
- }
- init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
-
- /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
- skip_bits(&a->gb, 32);
-
- a->qscale= get_bits(&a->gb, 16);
- a->version= get_bits(&a->gb, 16);
-
- printf("qscale:%d (0x%X), version:%d (0x%X)\n", a->qscale, a->qscale, a->version, a->version);
-
- for(a->mb_x=0; a->mb_x<a->mb_width; a->mb_x++){
- for(a->mb_y=0; a->mb_y<a->mb_height; a->mb_y++){
- if( decode_mb(a, a->block) <0)
- return -1;
-
- idct_put(a, a->mb_x, a->mb_y);
- }
- }
-
-// p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
-// memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
-
- *picture= *(AVFrame*)&a->picture;
- *data_size = sizeof(AVPicture);
-
- emms_c();
-
- return (get_bits_count(&a->gb)+31)/32*4;
-}
-
-static void mdec_common_init(AVCodecContext *avctx){
- MDECContext * const a = avctx->priv_data;
-
- dsputil_init(&a->dsp, avctx);
-
- a->mb_width = (avctx->width + 15) / 16;
- a->mb_height = (avctx->height + 15) / 16;
-
- avctx->coded_frame= (AVFrame*)&a->picture;
- a->avctx= avctx;
-}
-
-static int decode_init(AVCodecContext *avctx){
- MDECContext * const a = avctx->priv_data;
- AVFrame *p= (AVFrame*)&a->picture;
-
- mdec_common_init(avctx);
- init_vlcs();
- ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
-/*
- for(i=0; i<64; i++){
- int index= ff_zigzag_direct[i];
- a->intra_matrix[i]= 64*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
- }
-*/
- p->qstride= a->mb_width;
- p->qscale_table= av_mallocz( p->qstride * a->mb_height);
-
- return 0;
-}
-
-static int decode_end(AVCodecContext *avctx){
- MDECContext * const a = avctx->priv_data;
-
- av_freep(&a->bitstream_buffer);
- av_freep(&a->picture.qscale_table);
- a->bitstream_buffer_size=0;
-
- avcodec_default_free_buffers(avctx);
-
- return 0;
-}
-
-AVCodec mdec_decoder = {
- "mdec",
- CODEC_TYPE_VIDEO,
- CODEC_ID_MDEC,
- sizeof(MDECContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
-};
-
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