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grayscale only encoding 

Originally committed as revision 679 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-06-09 14:04:36 +00:00
parent 0398717356
commit 6282185e82
1 changed files with 26 additions and 8 deletions
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34
libavcodec/mpegvideo.c
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@ -1421,12 +1421,17 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
get_pixels(s->block[2], ptr + 8 * wrap , wrap);
get_pixels(s->block[3], ptr + 8 * wrap + 8, wrap);
wrap >>=1;
ptr = s->new_picture[1] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[4], ptr, wrap);
if(s->flags&CODEC_FLAG_GRAY){
skip_dct[4]= 1;
skip_dct[5]= 1;
}else{
wrap >>=1;
ptr = s->new_picture[1] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[4], ptr, wrap);
ptr = s->new_picture[2] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[5], ptr, wrap);
ptr = s->new_picture[2] + (mb_y * 8 * wrap) + mb_x * 8;
get_pixels(s->block[5], ptr, wrap);
}
}else{
op_pixels_func *op_pix;
qpel_mc_func *op_qpix;
@ -1466,9 +1471,15 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
diff_pixels(s->block[1], ptr_y + 8, dest_y + 8, wrap_y);
diff_pixels(s->block[2], ptr_y + 8 * wrap_y , dest_y + 8 * wrap_y , wrap_y);
diff_pixels(s->block[3], ptr_y + 8 * wrap_y + 8, dest_y + 8 * wrap_y + 8, wrap_y);
diff_pixels(s->block[4], ptr_cb, dest_cb, wrap_c);
diff_pixels(s->block[5], ptr_cr, dest_cr, wrap_c);
if(s->flags&CODEC_FLAG_GRAY){
skip_dct[4]= 1;
skip_dct[5]= 1;
}else{
diff_pixels(s->block[4], ptr_cb, dest_cb, wrap_c);
diff_pixels(s->block[5], ptr_cr, dest_cr, wrap_c);
}
/* pre quantization */
if(s->mc_mb_var[s->mb_width*mb_y+ mb_x]<2*s->qscale*s->qscale){
if(pix_abs8x8(ptr_y , dest_y , wrap_y) < 20*s->qscale) skip_dct[0]= 1;
@ -1546,6 +1557,13 @@ static void encode_mb(MpegEncContext *s, int motion_x, int motion_y)
dct_single_coeff_elimination(s, i, s->chroma_elim_threshold, 1);
}
if((s->flags&CODEC_FLAG_GRAY) && s->mb_intra){
s->block_last_index[4]=
s->block_last_index[5]= 0;
s->block[4][0]=
s->block[5][0]= 128;
}
/* huffman encode */
switch(s->out_format) {
case FMT_MPEG1: