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libavcodec/wmv2enc.c

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00001 /*
00002  * Copyright (c) 2002 The FFmpeg Project
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include "avcodec.h"
00022 #include "dsputil.h"
00023 #include "mpegvideo.h"
00024 #include "msmpeg4.h"
00025 #include "msmpeg4data.h"
00026 #include "h263.h"
00027 #include "wmv2.h"
00028 
00029 
00030 static int encode_ext_header(Wmv2Context *w){
00031     MpegEncContext * const s= &w->s;
00032     PutBitContext pb;
00033     int code;
00034 
00035     init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
00036 
00037     put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
00038     put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
00039 
00040     put_bits(&pb, 1, w->mspel_bit=1);
00041     put_bits(&pb, 1, s->loop_filter);
00042     put_bits(&pb, 1, w->abt_flag=1);
00043     put_bits(&pb, 1, w->j_type_bit=1);
00044     put_bits(&pb, 1, w->top_left_mv_flag=0);
00045     put_bits(&pb, 1, w->per_mb_rl_bit=1);
00046     put_bits(&pb, 3, code=1);
00047 
00048     flush_put_bits(&pb);
00049 
00050     s->slice_height = s->mb_height / code;
00051 
00052     return 0;
00053 }
00054 
00055 static av_cold int wmv2_encode_init(AVCodecContext *avctx){
00056     Wmv2Context * const w= avctx->priv_data;
00057 
00058     if(MPV_encode_init(avctx) < 0)
00059         return -1;
00060 
00061     ff_wmv2_common_init(w);
00062 
00063     avctx->extradata_size= 4;
00064     avctx->extradata= av_mallocz(avctx->extradata_size + 10);
00065     encode_ext_header(w);
00066 
00067     return 0;
00068 }
00069 
00070 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
00071 {
00072     Wmv2Context * const w= (Wmv2Context*)s;
00073 
00074     put_bits(&s->pb, 1, s->pict_type - 1);
00075     if(s->pict_type == FF_I_TYPE){
00076         put_bits(&s->pb, 7, 0);
00077     }
00078     put_bits(&s->pb, 5, s->qscale);
00079 
00080     s->dc_table_index = 1;
00081     s->mv_table_index = 1; /* only if P frame */
00082     s->per_mb_rl_table = 0;
00083     s->mspel= 0;
00084     w->per_mb_abt=0;
00085     w->abt_type=0;
00086     w->j_type=0;
00087 
00088     assert(s->flipflop_rounding);
00089 
00090     if (s->pict_type == FF_I_TYPE) {
00091         assert(s->no_rounding==1);
00092         if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
00093 
00094         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
00095 
00096         if(!s->per_mb_rl_table){
00097             ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
00098             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
00099         }
00100 
00101         put_bits(&s->pb, 1, s->dc_table_index);
00102 
00103         s->inter_intra_pred= 0;
00104     }else{
00105         int cbp_index;
00106 
00107         put_bits(&s->pb, 2, SKIP_TYPE_NONE);
00108 
00109         ff_msmpeg4_code012(&s->pb, cbp_index=0);
00110         if(s->qscale <= 10){
00111             int map[3]= {0,2,1};
00112             w->cbp_table_index= map[cbp_index];
00113         }else if(s->qscale <= 20){
00114             int map[3]= {1,0,2};
00115             w->cbp_table_index= map[cbp_index];
00116         }else{
00117             int map[3]= {2,1,0};
00118             w->cbp_table_index= map[cbp_index];
00119         }
00120 
00121         if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
00122 
00123         if(w->abt_flag){
00124             put_bits(&s->pb, 1, w->per_mb_abt^1);
00125             if(!w->per_mb_abt){
00126                 ff_msmpeg4_code012(&s->pb, w->abt_type);
00127             }
00128         }
00129 
00130         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
00131 
00132         if(!s->per_mb_rl_table){
00133             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
00134             s->rl_chroma_table_index = s->rl_table_index;
00135         }
00136         put_bits(&s->pb, 1, s->dc_table_index);
00137         put_bits(&s->pb, 1, s->mv_table_index);
00138 
00139         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
00140     }
00141     s->esc3_level_length= 0;
00142     s->esc3_run_length= 0;
00143 
00144     return 0;
00145 }
00146 
00147 /* Nearly identical to wmv1 but that is just because we do not use the
00148  * useless M$ crap features. It is duplicated here in case someone wants
00149  * to add support for these crap features. */
00150 void ff_wmv2_encode_mb(MpegEncContext * s,
00151                        DCTELEM block[6][64],
00152                        int motion_x, int motion_y)
00153 {
00154     Wmv2Context * const w= (Wmv2Context*)s;
00155     int cbp, coded_cbp, i;
00156     int pred_x, pred_y;
00157     uint8_t *coded_block;
00158 
00159     ff_msmpeg4_handle_slices(s);
00160 
00161     if (!s->mb_intra) {
00162         /* compute cbp */
00163         cbp = 0;
00164         for (i = 0; i < 6; i++) {
00165             if (s->block_last_index[i] >= 0)
00166                 cbp |= 1 << (5 - i);
00167         }
00168 
00169         put_bits(&s->pb,
00170                  wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
00171                  wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
00172 
00173         /* motion vector */
00174         h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
00175         ff_msmpeg4_encode_motion(s, motion_x - pred_x,
00176                               motion_y - pred_y);
00177     } else {
00178         /* compute cbp */
00179         cbp = 0;
00180         coded_cbp = 0;
00181         for (i = 0; i < 6; i++) {
00182             int val, pred;
00183             val = (s->block_last_index[i] >= 1);
00184             cbp |= val << (5 - i);
00185             if (i < 4) {
00186                 /* predict value for close blocks only for luma */
00187                 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
00188                 *coded_block = val;
00189                 val = val ^ pred;
00190             }
00191             coded_cbp |= val << (5 - i);
00192         }
00193 
00194         if (s->pict_type == FF_I_TYPE) {
00195             put_bits(&s->pb,
00196                      ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
00197         } else {
00198             put_bits(&s->pb,
00199                      wmv2_inter_table[w->cbp_table_index][cbp][1],
00200                      wmv2_inter_table[w->cbp_table_index][cbp][0]);
00201         }
00202         put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
00203         if(s->inter_intra_pred){
00204             s->h263_aic_dir=0;
00205             put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
00206         }
00207     }
00208 
00209     for (i = 0; i < 6; i++) {
00210         ff_msmpeg4_encode_block(s, block[i], i);
00211     }
00212 }
00213 
00214 AVCodec wmv2_encoder = {
00215     "wmv2",
00216     AVMEDIA_TYPE_VIDEO,
00217     CODEC_ID_WMV2,
00218     sizeof(Wmv2Context),
00219     wmv2_encode_init,
00220     MPV_encode_picture,
00221     MPV_encode_end,
00222     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00223     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
00224 };

Generated on Fri Sep 16 2011 17:17:46 for FFmpeg by  doxygen 1.7.1