/* * H263 decoder * Copyright (c) 2001 Fabrice Bellard. * * 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 */ #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" //#define DEBUG //#define PRINT_FRAME_TIME #ifdef PRINT_FRAME_TIME static inline long long rdtsc() { long long l; asm volatile( "rdtsc\n\t" : "=A" (l) ); // printf("%d\n", int(l/1000)); return l; } #endif static int h263_decode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; s->avctx = avctx; s->out_format = FMT_H263; s->width = avctx->width; s->height = avctx->height; s->workaround_bugs= avctx->workaround_bugs; /* select sub codec */ switch(avctx->codec->id) { case CODEC_ID_H263: s->gob_number = 0; s->first_slice_line = 0; break; case CODEC_ID_MPEG4: s->time_increment_bits = 4; /* default value for broken headers */ s->h263_pred = 1; s->has_b_frames = 1; //default, might be overriden in the vol header during header parsing break; case CODEC_ID_MSMPEG4V1: s->h263_msmpeg4 = 1; s->h263_pred = 1; s->msmpeg4_version=1; break; case CODEC_ID_MSMPEG4V2: s->h263_msmpeg4 = 1; s->h263_pred = 1; s->msmpeg4_version=2; break; case CODEC_ID_MSMPEG4V3: s->h263_msmpeg4 = 1; s->h263_pred = 1; s->msmpeg4_version=3; break; case CODEC_ID_WMV1: s->h263_msmpeg4 = 1; s->h263_pred = 1; s->msmpeg4_version=4; break; case CODEC_ID_WMV2: s->h263_msmpeg4 = 1; s->h263_pred = 1; s->msmpeg4_version=5; break; case CODEC_ID_H263I: s->h263_intel = 1; break; default: return -1; } s->codec_id= avctx->codec->id; /* for h263, we allocate the images after having read the header */ if (avctx->codec->id != CODEC_ID_H263 && avctx->codec->id != CODEC_ID_MPEG4) if (MPV_common_init(s) < 0) return -1; if (s->h263_msmpeg4) ff_msmpeg4_decode_init(s); else h263_decode_init_vlc(s); return 0; } static int h263_decode_end(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; MPV_common_end(s); return 0; } static int h263_decode_frame(AVCodecContext *avctx, void *data, int *data_size, UINT8 *buf, int buf_size) { MpegEncContext *s = avctx->priv_data; int ret; AVPicture *pict = data; #ifdef PRINT_FRAME_TIME uint64_t time= rdtsc(); #endif #ifdef DEBUG printf("*****frame %d size=%d\n", avctx->frame_number, buf_size); printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]); #endif s->hurry_up= avctx->hurry_up; s->error_resilience= avctx->error_resilience; s->workaround_bugs= avctx->workaround_bugs; s->flags= avctx->flags; /* no supplementary picture */ if (buf_size == 0) { *data_size = 0; return 0; } if(s->bitstream_buffer_size && buf_size<20){ //divx 5.01+ frame reorder init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size); }else init_get_bits(&s->gb, buf, buf_size); s->bitstream_buffer_size=0; /* let's go :-) */ if (s->h263_msmpeg4) { ret = msmpeg4_decode_picture_header(s); } else if (s->h263_pred) { ret = mpeg4_decode_picture_header(s); s->has_b_frames= !s->low_delay; } else if (s->h263_intel) { ret = intel_h263_decode_picture_header(s); } else { ret = h263_decode_picture_header(s); } avctx->has_b_frames= s->has_b_frames; #if 0 // dump bits per frame / qp / complexity { static FILE *f=NULL; if(!f) f=fopen("rate_qp_cplx.txt", "w"); fprintf(f, "%d %d %f\n", buf_size, s->qscale, buf_size*(double)s->qscale); } #endif /* After H263 & mpeg4 header decode we have the height, width,*/ /* and other parameters. So then we could init the picture */ /* FIXME: By the way H263 decoder is evolving it should have */ /* an H263EncContext */ if (s->width != avctx->width || s->height != avctx->height) { /* H.263 could change picture size any time */ MPV_common_end(s); s->context_initialized=0; } if (!s->context_initialized) { avctx->width = s->width; avctx->height = s->height; avctx->aspect_ratio_info= s->aspect_ratio_info; if (MPV_common_init(s) < 0) return -1; } if(ret==FRAME_SKIPED) return buf_size; /* skip if the header was thrashed */ if (ret < 0){ fprintf(stderr, "header damaged\n"); return -1; } /* skip b frames if we dont have reference frames */ if(s->num_available_buffers<2 && s->pict_type==B_TYPE) return buf_size; /* skip b frames if we are in a hurry */ if(s->hurry_up && s->pict_type==B_TYPE) return buf_size; if(s->next_p_frame_damaged){ if(s->pict_type==B_TYPE) return buf_size; else s->next_p_frame_damaged=0; } MPV_frame_start(s, avctx); #ifdef DEBUG printf("qscale=%d\n", s->qscale); #endif /* init resync/ error resilience specific variables */ s->next_resync_qscale= s->qscale; s->next_resync_gb= s->gb; if(s->resync_marker) s->mb_num_left= 0; else s->mb_num_left= s->mb_num; /* decode each macroblock */ s->block_wrap[0]= s->block_wrap[1]= s->block_wrap[2]= s->block_wrap[3]= s->mb_width*2 + 2; s->block_wrap[4]= s->block_wrap[5]= s->mb_width + 2; for(s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) { /* Check for GOB headers on H.263 */ /* FIXME: In the future H.263+ will have intra prediction */ /* and we are gonna need another way to detect MPEG4 */ if (s->mb_y && !s->h263_pred) { s->first_slice_line = h263_decode_gob_header(s); } if(s->msmpeg4_version==1){ s->last_dc[0]= s->last_dc[1]= s->last_dc[2]= 128; } s->y_dc_scale= s->y_dc_scale_table[ s->qscale ]; s->c_dc_scale= s->c_dc_scale_table[ s->qscale ]; s->block_index[0]= s->block_wrap[0]*(s->mb_y*2 + 1) - 1; s->block_index[1]= s->block_wrap[0]*(s->mb_y*2 + 1); s->block_index[2]= s->block_wrap[0]*(s->mb_y*2 + 2) - 1; s->block_index[3]= s->block_wrap[0]*(s->mb_y*2 + 2); s->block_index[4]= s->block_wrap[4]*(s->mb_y + 1) + s->block_wrap[0]*(s->mb_height*2 + 2); s->block_index[5]= s->block_wrap[4]*(s->mb_y + 1 + s->mb_height + 2) + s->block_wrap[0]*(s->mb_height*2 + 2); for(s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) { s->block_index[0]+=2; s->block_index[1]+=2; s->block_index[2]+=2; s->block_index[3]+=2; s->block_index[4]++; s->block_index[5]++; #ifdef DEBUG printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y); #endif if(s->resync_marker){ if(s->mb_num_left<=0){ /* except the first block */ if(s->mb_x!=0 || s->mb_y!=0){ /* did we miss the next resync marker without noticing an error yet */ if(((get_bits_count(&s->gb)+8)&(~7)) != s->next_resync_pos && s->decoding_error==0){ fprintf(stderr, "slice end missmatch x:%d y:%d %d %d\n", s->mb_x, s->mb_y, get_bits_count(&s->gb), s->next_resync_pos); ff_conceal_past_errors(s, 1); } } s->qscale= s->next_resync_qscale; s->y_dc_scale= s->y_dc_scale_table[ s->qscale ]; s->c_dc_scale= s->c_dc_scale_table[ s->qscale ]; s->gb= s->next_resync_gb; s->resync_mb_x= s->mb_x; //we know that the marker is here cuz mb_num_left was the distance to it s->resync_mb_y= s->mb_y; s->first_slice_line=1; if(s->codec_id==CODEC_ID_MPEG4){ ff_mpeg4_clean_buffers(s); ff_mpeg4_resync(s); } } if( s->resync_mb_x==s->mb_x && s->resync_mb_y==s->mb_y && s->decoding_error!=0){ fprintf(stderr, "resynced at %d %d\n", s->mb_x, s->mb_y); s->decoding_error= 0; } } //fprintf(stderr,"\nFrame: %d\tMB: %d",avctx->frame_number, (s->mb_y * s->mb_width) + s->mb_x); /* DCT & quantize */ if(s->decoding_error!=DECODING_DESYNC){ int last_error= s->decoding_error; clear_blocks(s->block[0]); s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if (s->h263_msmpeg4) { if (msmpeg4_decode_mb(s, s->block) < 0) { fprintf(stderr,"Error at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x); s->decoding_error=DECODING_DESYNC; } } else { if (h263_decode_mb(s, s->block) < 0) { fprintf(stderr,"Error at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x); s->decoding_error=DECODING_DESYNC; } } if(s->decoding_error!=last_error){ ff_conceal_past_errors(s, 0); } } /* conceal errors */ if( s->decoding_error==DECODING_DESYNC || (s->decoding_error==DECODING_ACDC_LOST && s->mb_intra)){ s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mb_skiped=0; s->mb_intra=0; s->mv[0][0][0]=0; //FIXME this is not optimal s->mv[0][0][1]=0; clear_blocks(s->block[0]); }else if(s->decoding_error && !s->mb_intra){ clear_blocks(s->block[0]); } //FIXME remove AC for intra MPV_decode_mb(s, s->block); s->mb_num_left--; } if ( avctx->draw_horiz_band && (s->num_available_buffers>=1 || (!s->has_b_frames)) ) { UINT8 *src_ptr[3]; int y, h, offset; y = s->mb_y * 16; h = s->height - y; if (h > 16) h = 16; offset = y * s->linesize; if(s->pict_type==B_TYPE || (!s->has_b_frames)){ src_ptr[0] = s->current_picture[0] + offset; src_ptr[1] = s->current_picture[1] + (offset >> 2); src_ptr[2] = s->current_picture[2] + (offset >> 2); } else { src_ptr[0] = s->last_picture[0] + offset; src_ptr[1] = s->last_picture[1] + (offset >> 2); src_ptr[2] = s->last_picture[2] + (offset >> 2); } avctx->draw_horiz_band(avctx, src_ptr, s->linesize, y, s->width, h); } } if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE) if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1; /* divx 5.01+ bistream reorder stuff */ if(s->codec_id==CODEC_ID_MPEG4 && s->bitstream_buffer_size==0){ int current_pos= get_bits_count(&s->gb)>>3; if( buf_size - current_pos > 5 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){ int i; int startcode_found=0; for(i=current_pos; ibitstream_buffer, buf + current_pos, buf_size - current_pos); s->bitstream_buffer_size= buf_size - current_pos; } } } if(s->bitstream_buffer_size==0 && s->error_resilience>0){ int left= s->gb.size*8 - get_bits_count(&s->gb); int max_extra=8; if(s->codec_id==CODEC_ID_MPEG4) max_extra+=32; if(left>max_extra){ fprintf(stderr, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24)); if(s->decoding_error==0) ff_conceal_past_errors(s, 1); } if(left<0){ fprintf(stderr, "overreading %d bits\n", -left); if(s->decoding_error==0) ff_conceal_past_errors(s, 1); } } MPV_frame_end(s); #if 0 //dirty show MVs, we should export the MV tables and write a filter to show them { int mb_y; s->has_b_frames=1; for(mb_y=0; mb_ymb_height; mb_y++){ int mb_x; int y= mb_y*16 + 8; for(mb_x=0; mb_xmb_width; mb_x++){ int x= mb_x*16 + 8; uint8_t *ptr= s->last_picture[0]; int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2); int mx= (s->motion_val[xy][0]>>1) + x; int my= (s->motion_val[xy][1]>>1) + y; int i; int max; if(mx<0) mx=0; if(my<0) my=0; if(mx>=s->width) mx= s->width -1; if(my>=s->height) my= s->height-1; max= ABS(mx-x); if(ABS(my-y) > max) max= ABS(my-y); /* the ugliest linedrawing routine ... */ for(i=0; ilinesize + x1]+=100; } ptr[y*s->linesize + x]+=100; s->mbskip_table[mb_x + mb_y*s->mb_width]=0; } } } #endif if(s->pict_type==B_TYPE || (!s->has_b_frames)){ pict->data[0] = s->current_picture[0]; pict->data[1] = s->current_picture[1]; pict->data[2] = s->current_picture[2]; } else { pict->data[0] = s->last_picture[0]; pict->data[1] = s->last_picture[1]; pict->data[2] = s->last_picture[2]; } pict->linesize[0] = s->linesize; pict->linesize[1] = s->uvlinesize; pict->linesize[2] = s->uvlinesize; avctx->quality = s->qscale; /* Return the Picture timestamp as the frame number */ /* we substract 1 because it is added on utils.c */ avctx->frame_number = s->picture_number - 1; /* dont output the last pic after seeking note we allready added +1 for the current pix in MPV_frame_end(s) */ if(s->num_available_buffers>=2 || (!s->has_b_frames)) *data_size = sizeof(AVPicture); #ifdef PRINT_FRAME_TIME printf("%Ld\n", rdtsc()-time); #endif return buf_size; } AVCodec mpeg4_decoder = { "mpeg4", CODEC_TYPE_VIDEO, CODEC_ID_MPEG4, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec h263_decoder = { "h263", CODEC_TYPE_VIDEO, CODEC_ID_H263, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec msmpeg4v1_decoder = { "msmpeg4v1", CODEC_TYPE_VIDEO, CODEC_ID_MSMPEG4V1, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec msmpeg4v2_decoder = { "msmpeg4v2", CODEC_TYPE_VIDEO, CODEC_ID_MSMPEG4V2, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec msmpeg4v3_decoder = { "msmpeg4", CODEC_TYPE_VIDEO, CODEC_ID_MSMPEG4V3, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec wmv1_decoder = { "wmv1", CODEC_TYPE_VIDEO, CODEC_ID_WMV1, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec wmv2_decoder = { "wmv2", CODEC_TYPE_VIDEO, CODEC_ID_WMV2, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, }; AVCodec h263i_decoder = { "h263i", CODEC_TYPE_VIDEO, CODEC_ID_H263I, sizeof(MpegEncContext), h263_decode_init, NULL, h263_decode_end, h263_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1, };