242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/*
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* Copyright (c) 2002 The FFmpeg Project.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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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#include "msmpeg4.h"
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#include "msmpeg4data.h"
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#include "wmv2.h"
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static int encode_ext_header(Wmv2Context *w){
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MpegEncContext * const s= &w->s;
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PutBitContext pb;
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int code;
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init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
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put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
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put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
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put_bits(&pb, 1, w->mspel_bit=1);
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put_bits(&pb, 1, s->loop_filter);
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put_bits(&pb, 1, w->abt_flag=1);
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put_bits(&pb, 1, w->j_type_bit=1);
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put_bits(&pb, 1, w->top_left_mv_flag=0);
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put_bits(&pb, 1, w->per_mb_rl_bit=1);
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put_bits(&pb, 3, code=1);
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flush_put_bits(&pb);
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s->slice_height = s->mb_height / code;
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return 0;
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}
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static av_cold int wmv2_encode_init(AVCodecContext *avctx){
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Wmv2Context * const w= avctx->priv_data;
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if(MPV_encode_init(avctx) < 0)
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return -1;
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ff_wmv2_common_init(w);
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avctx->extradata_size= 4;
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avctx->extradata= av_mallocz(avctx->extradata_size + 10);
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encode_ext_header(w);
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return 0;
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}
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#if 0 /* unused, remove? */
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static av_cold int wmv2_encode_end(AVCodecContext *avctx){
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if(MPV_encode_end(avctx) < 0)
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return -1;
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avctx->extradata_size= 0;
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av_freep(&avctx->extradata);
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return 0;
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}
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#endif
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int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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Wmv2Context * const w= (Wmv2Context*)s;
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put_bits(&s->pb, 1, s->pict_type - 1);
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if(s->pict_type == FF_I_TYPE){
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put_bits(&s->pb, 7, 0);
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}
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put_bits(&s->pb, 5, s->qscale);
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s->dc_table_index = 1;
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s->mv_table_index = 1; /* only if P frame */
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// s->use_skip_mb_code = 1; /* only if P frame */
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s->per_mb_rl_table = 0;
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s->mspel= 0;
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w->per_mb_abt=0;
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w->abt_type=0;
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w->j_type=0;
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assert(s->flipflop_rounding);
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if (s->pict_type == FF_I_TYPE) {
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assert(s->no_rounding==1);
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if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
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if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
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if(!s->per_mb_rl_table){
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ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
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ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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}
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put_bits(&s->pb, 1, s->dc_table_index);
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s->inter_intra_pred= 0;
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}else{
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int cbp_index;
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put_bits(&s->pb, 2, SKIP_TYPE_NONE);
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ff_msmpeg4_code012(&s->pb, cbp_index=0);
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if(s->qscale <= 10){
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int map[3]= {0,2,1};
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w->cbp_table_index= map[cbp_index];
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}else if(s->qscale <= 20){
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int map[3]= {1,0,2};
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w->cbp_table_index= map[cbp_index];
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}else{
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int map[3]= {2,1,0};
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w->cbp_table_index= map[cbp_index];
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}
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if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
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if(w->abt_flag){
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put_bits(&s->pb, 1, w->per_mb_abt^1);
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if(!w->per_mb_abt){
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ff_msmpeg4_code012(&s->pb, w->abt_type);
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}
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}
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if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
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if(!s->per_mb_rl_table){
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ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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s->rl_chroma_table_index = s->rl_table_index;
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}
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put_bits(&s->pb, 1, s->dc_table_index);
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put_bits(&s->pb, 1, s->mv_table_index);
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s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
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}
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s->esc3_level_length= 0;
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s->esc3_run_length= 0;
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return 0;
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}
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/* Nearly identical to wmv1 but that is just because we do not use the
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* useless M$ crap features. It is duplicated here in case someone wants
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* to add support for these crap features. */
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void ff_wmv2_encode_mb(MpegEncContext * s,
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DCTELEM block[6][64],
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int motion_x, int motion_y)
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{
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Wmv2Context * const w= (Wmv2Context*)s;
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int cbp, coded_cbp, i;
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int pred_x, pred_y;
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uint8_t *coded_block;
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ff_msmpeg4_handle_slices(s);
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if (!s->mb_intra) {
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/* compute cbp */
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cbp = 0;
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for (i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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}
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put_bits(&s->pb,
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wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
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wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
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/* motion vector */
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h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
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ff_msmpeg4_encode_motion(s, motion_x - pred_x,
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motion_y - pred_y);
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} else {
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/* compute cbp */
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cbp = 0;
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coded_cbp = 0;
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for (i = 0; i < 6; i++) {
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int val, pred;
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val = (s->block_last_index[i] >= 1);
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cbp |= val << (5 - i);
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if (i < 4) {
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/* predict value for close blocks only for luma */
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pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
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*coded_block = val;
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val = val ^ pred;
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}
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coded_cbp |= val << (5 - i);
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}
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#if 0
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if (coded_cbp)
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printf("cbp=%x %x\n", cbp, coded_cbp);
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#endif
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if (s->pict_type == FF_I_TYPE) {
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put_bits(&s->pb,
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ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
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} else {
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put_bits(&s->pb,
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wmv2_inter_table[w->cbp_table_index][cbp][1],
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wmv2_inter_table[w->cbp_table_index][cbp][0]);
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}
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put_bits(&s->pb, 1, 0); /* no AC prediction yet */
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if(s->inter_intra_pred){
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s->h263_aic_dir=0;
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put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
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}
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}
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for (i = 0; i < 6; i++) {
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ff_msmpeg4_encode_block(s, block[i], i);
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}
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}
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AVCodec wmv2_encoder = {
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"wmv2",
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CODEC_TYPE_VIDEO,
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CODEC_ID_WMV2,
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sizeof(Wmv2Context),
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wmv2_encode_init,
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MPV_encode_picture,
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MPV_encode_end,
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.pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
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.long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
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};
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