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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 "wmv2.h"
00027 
00028 
00029 static int encode_ext_header(Wmv2Context *w){
00030     MpegEncContext * const s= &w->s;
00031     PutBitContext pb;
00032     int code;
00033 
00034     init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
00035 
00036     put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
00037     put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
00038 
00039     put_bits(&pb, 1, w->mspel_bit=1);
00040     put_bits(&pb, 1, s->loop_filter);
00041     put_bits(&pb, 1, w->abt_flag=1);
00042     put_bits(&pb, 1, w->j_type_bit=1);
00043     put_bits(&pb, 1, w->top_left_mv_flag=0);
00044     put_bits(&pb, 1, w->per_mb_rl_bit=1);
00045     put_bits(&pb, 3, code=1);
00046 
00047     flush_put_bits(&pb);
00048 
00049     s->slice_height = s->mb_height / code;
00050 
00051     return 0;
00052 }
00053 
00054 static av_cold int wmv2_encode_init(AVCodecContext *avctx){
00055     Wmv2Context * const w= avctx->priv_data;
00056 
00057     if(MPV_encode_init(avctx) < 0)
00058         return -1;
00059 
00060     ff_wmv2_common_init(w);
00061 
00062     avctx->extradata_size= 4;
00063     avctx->extradata= av_mallocz(avctx->extradata_size + 10);
00064     encode_ext_header(w);
00065 
00066     return 0;
00067 }
00068 
00069 #if 0 /* unused, remove? */
00070 static av_cold int wmv2_encode_end(AVCodecContext *avctx){
00071 
00072     if(MPV_encode_end(avctx) < 0)
00073         return -1;
00074 
00075     avctx->extradata_size= 0;
00076     av_freep(&avctx->extradata);
00077 
00078     return 0;
00079 }
00080 #endif
00081 
00082 int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
00083 {
00084     Wmv2Context * const w= (Wmv2Context*)s;
00085 
00086     put_bits(&s->pb, 1, s->pict_type - 1);
00087     if(s->pict_type == FF_I_TYPE){
00088         put_bits(&s->pb, 7, 0);
00089     }
00090     put_bits(&s->pb, 5, s->qscale);
00091 
00092     s->dc_table_index = 1;
00093     s->mv_table_index = 1; /* only if P frame */
00094 //    s->use_skip_mb_code = 1; /* only if P frame */
00095     s->per_mb_rl_table = 0;
00096     s->mspel= 0;
00097     w->per_mb_abt=0;
00098     w->abt_type=0;
00099     w->j_type=0;
00100 
00101     assert(s->flipflop_rounding);
00102 
00103     if (s->pict_type == FF_I_TYPE) {
00104         assert(s->no_rounding==1);
00105         if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
00106 
00107         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
00108 
00109         if(!s->per_mb_rl_table){
00110             ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
00111             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
00112         }
00113 
00114         put_bits(&s->pb, 1, s->dc_table_index);
00115 
00116         s->inter_intra_pred= 0;
00117     }else{
00118         int cbp_index;
00119 
00120         put_bits(&s->pb, 2, SKIP_TYPE_NONE);
00121 
00122         ff_msmpeg4_code012(&s->pb, cbp_index=0);
00123         if(s->qscale <= 10){
00124             int map[3]= {0,2,1};
00125             w->cbp_table_index= map[cbp_index];
00126         }else if(s->qscale <= 20){
00127             int map[3]= {1,0,2};
00128             w->cbp_table_index= map[cbp_index];
00129         }else{
00130             int map[3]= {2,1,0};
00131             w->cbp_table_index= map[cbp_index];
00132         }
00133 
00134         if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
00135 
00136         if(w->abt_flag){
00137             put_bits(&s->pb, 1, w->per_mb_abt^1);
00138             if(!w->per_mb_abt){
00139                 ff_msmpeg4_code012(&s->pb, w->abt_type);
00140             }
00141         }
00142 
00143         if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
00144 
00145         if(!s->per_mb_rl_table){
00146             ff_msmpeg4_code012(&s->pb, s->rl_table_index);
00147             s->rl_chroma_table_index = s->rl_table_index;
00148         }
00149         put_bits(&s->pb, 1, s->dc_table_index);
00150         put_bits(&s->pb, 1, s->mv_table_index);
00151 
00152         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
00153     }
00154     s->esc3_level_length= 0;
00155     s->esc3_run_length= 0;
00156 
00157     return 0;
00158 }
00159 
00160 /* Nearly identical to wmv1 but that is just because we do not use the
00161  * useless M$ crap features. It is duplicated here in case someone wants
00162  * to add support for these crap features. */
00163 void ff_wmv2_encode_mb(MpegEncContext * s,
00164                        DCTELEM block[6][64],
00165                        int motion_x, int motion_y)
00166 {
00167     Wmv2Context * const w= (Wmv2Context*)s;
00168     int cbp, coded_cbp, i;
00169     int pred_x, pred_y;
00170     uint8_t *coded_block;
00171 
00172     ff_msmpeg4_handle_slices(s);
00173 
00174     if (!s->mb_intra) {
00175         /* compute cbp */
00176         cbp = 0;
00177         for (i = 0; i < 6; i++) {
00178             if (s->block_last_index[i] >= 0)
00179                 cbp |= 1 << (5 - i);
00180         }
00181 
00182         put_bits(&s->pb,
00183                  wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
00184                  wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
00185 
00186         /* motion vector */
00187         h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
00188         ff_msmpeg4_encode_motion(s, motion_x - pred_x,
00189                               motion_y - pred_y);
00190     } else {
00191         /* compute cbp */
00192         cbp = 0;
00193         coded_cbp = 0;
00194         for (i = 0; i < 6; i++) {
00195             int val, pred;
00196             val = (s->block_last_index[i] >= 1);
00197             cbp |= val << (5 - i);
00198             if (i < 4) {
00199                 /* predict value for close blocks only for luma */
00200                 pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
00201                 *coded_block = val;
00202                 val = val ^ pred;
00203             }
00204             coded_cbp |= val << (5 - i);
00205         }
00206 #if 0
00207         if (coded_cbp)
00208             printf("cbp=%x %x\n", cbp, coded_cbp);
00209 #endif
00210 
00211         if (s->pict_type == FF_I_TYPE) {
00212             put_bits(&s->pb,
00213                      ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
00214         } else {
00215             put_bits(&s->pb,
00216                      wmv2_inter_table[w->cbp_table_index][cbp][1],
00217                      wmv2_inter_table[w->cbp_table_index][cbp][0]);
00218         }
00219         put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
00220         if(s->inter_intra_pred){
00221             s->h263_aic_dir=0;
00222             put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
00223         }
00224     }
00225 
00226     for (i = 0; i < 6; i++) {
00227         ff_msmpeg4_encode_block(s, block[i], i);
00228     }
00229 }
00230 
00231 AVCodec wmv2_encoder = {
00232     "wmv2",
00233     CODEC_TYPE_VIDEO,
00234     CODEC_ID_WMV2,
00235     sizeof(Wmv2Context),
00236     wmv2_encode_init,
00237     MPV_encode_picture,
00238     MPV_encode_end,
00239     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00240     .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
00241 };

Generated on Sat Feb 16 2013 09:23:14 for ffmpeg by  doxygen 1.7.1