virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

sliced mode for mpeg1/2

Browse Source 
Originally committed as revision 991 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-10-02 16:36:43 +00:00
parent acf44abb8c
commit ce5b7c5e11
1 changed files with 77 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

122
libavcodec/mpeg12.c
View File

@ -674,39 +674,6 @@ static int mpeg_decode_mb(MpegEncContext *s,
{
int i, j, k, cbp, val, code, mb_type, motion_type;
/* skip mb handling */
if (s->mb_incr == 0) {
/* read again increment */
s->mb_incr = 1;
for(;;) {
code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
if (code < 0)
return 1; /* error = end of slice */
if (code >= 33) {
if (code == 33) {
s->mb_incr += 33;
}
/* otherwise, stuffing, nothing to do */
} else {
s->mb_incr += code;
break;
}
}
}
if(s->mb_x==-1 /* first MB in a slice */ && s->mb_incr>1){
s->mb_x+= (s->mb_incr - 1) % s->mb_width;
s->mb_y+= (s->mb_incr - 1) / s->mb_width;
s->mb_incr= 1;
}
if (++s->mb_x >= s->mb_width) {
s->mb_x = 0;
if (s->mb_y >= (s->mb_height - 1)){
fprintf(stderr, "slice too long\n");
return -1;
}
s->mb_y++;
}
dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
if (--s->mb_incr != 0) {
@ -1585,9 +1552,6 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
s->last_dc[1] = s->last_dc[0];
s->last_dc[2] = s->last_dc[0];
memset(s->last_mv, 0, sizeof(s->last_mv));
s->mb_x = -1;
s->mb_y = start_code;
s->mb_incr = 0;
/* start frame decoding */
if (s->first_slice) {
s->first_slice = 0;
@ -1602,27 +1566,95 @@ static int mpeg_decode_slice(AVCodecContext *avctx,
skip_bits(&s->gb, 8);
}
s->mb_x=0;
for(;;) {
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
if (code < 0)
return -1; /* error = end of slice, but empty slice is bad or?*/
if (code >= 33) {
if (code == 33) {
s->mb_x += 33;
}
/* otherwise, stuffing, nothing to do */
} else {
s->mb_x += code;
break;
}
}
s->mb_y = start_code;
s->mb_incr= 1;
for(;;) {
clear_blocks(s->block[0]);
emms_c();
ret = mpeg_decode_mb(s, s->block);
dprintf("ret=%d\n", ret);
if (ret < 0)
return -1;
if (ret == 1)
break;
if(s->mb_x==0)
PRINT_QP("%s", "\n");
PRINT_QP("%2d", s->qscale);
MPV_decode_mb(s, s->block);
if (++s->mb_x >= s->mb_width) {
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);
}
s->mb_x = 0;
s->mb_y++;
PRINT_QP("%s", "\n");
}
PRINT_QP("%2d", s->qscale);
/* skip mb handling */
if (s->mb_incr == 0) {
/* read again increment */
s->mb_incr = 1;
for(;;) {
int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
if (code < 0)
goto eos; /* error = end of slice */
if (code >= 33) {
if (code == 33) {
s->mb_incr += 33;
}
/* otherwise, stuffing, nothing to do */
} else {
s->mb_incr += code;
break;
}
}
}
if(s->mb_y >= s->mb_height){
fprintf(stderr, "slice too long\n");
return -1;
}
}
eos: //end of slice
emms_c();
/* end of slice reached */
if (s->mb_x == (s->mb_width - 1) &&
s->mb_y == (s->mb_height - 1)) {
if (/*s->mb_x == 0 &&*/
s->mb_y == s->mb_height) {
/* end of image */
UINT8 **picture;
@ -1921,5 +1953,5 @@ AVCodec mpeg_decoder = {
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DR1,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
};