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Add field prev_interlaced_frame to H264Context to be able to flag soft telecine

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progressive.

Patch by Haruhiko Yamagata, h D yamagata A nifty D com

Originally committed as revision 19141 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Haruhiko Yamagata 2009-06-09 21:16:40 +00:00 committed by Carl Eugen Hoyos
parent 277a28e8fc
commit b19d493f2b
2 changed files with 29 additions and 6 deletions
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27
libavcodec/h264.c
View File

@ -3153,6 +3153,7 @@ static void flush_dpb(AVCodecContext *avctx){
h->delayed_pic[i]= NULL;
}
h->outputed_poc= INT_MIN;
h->prev_interlaced_frame = 1;
idr(h);
if(h->s.current_picture_ptr)
h->s.current_picture_ptr->reference= 0;
@ -3807,6 +3808,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
if (MPV_common_init(s) < 0)
return -1;
s->first_field = 0;
h->prev_interlaced_frame = 1;
init_scan_tables(h);
alloc_tables(h);
@ -7789,18 +7791,29 @@ static int decode_frame(AVCodecContext *avctx,
*data_size = 0;
} else {
cur->interlaced_frame = 0;
cur->repeat_pict = 0;
/* Signal interlacing information externally. */
/* Prioritize picture timing SEI information over used decoding process if it exists. */
if (h->sei_ct_type & 3)
cur->interlaced_frame = (h->sei_ct_type & (1<<1)) != 0;
else
cur->interlaced_frame = FIELD_OR_MBAFF_PICTURE;
if(h->sps.pic_struct_present_flag){
switch (h->sei_pic_struct)
{
case SEI_PIC_STRUCT_FRAME:
break;
case SEI_PIC_STRUCT_TOP_FIELD:
case SEI_PIC_STRUCT_BOTTOM_FIELD:
cur->interlaced_frame = 1;
break;
case SEI_PIC_STRUCT_TOP_BOTTOM:
case SEI_PIC_STRUCT_BOTTOM_TOP:
if (FIELD_OR_MBAFF_PICTURE)
cur->interlaced_frame = 1;
else
// try to flag soft telecine progressive
cur->interlaced_frame = h->prev_interlaced_frame;
break;
case SEI_PIC_STRUCT_TOP_BOTTOM_TOP:
case SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM:
// Signal the possibility of telecined film externally (pic_struct 5,6)
@ -7809,18 +7822,20 @@ static int decode_frame(AVCodecContext *avctx,
break;
case SEI_PIC_STRUCT_FRAME_DOUBLING:
// Force progressive here, as doubling interlaced frame is a bad idea.
cur->interlaced_frame = 0;
cur->repeat_pict = 2;
break;
case SEI_PIC_STRUCT_FRAME_TRIPLING:
cur->interlaced_frame = 0;
cur->repeat_pict = 4;
break;
}
if ((h->sei_ct_type & 3) && h->sei_pic_struct <= SEI_PIC_STRUCT_BOTTOM_TOP)
cur->interlaced_frame = (h->sei_ct_type & (1<<1)) != 0;
}else{
/* Derive interlacing flag from used decoding process. */
cur->interlaced_frame = FIELD_OR_MBAFF_PICTURE;
}
h->prev_interlaced_frame = cur->interlaced_frame;
if (cur->field_poc[0] != cur->field_poc[1]){
/* Derive top_field_first from field pocs. */

8
libavcodec/h264.h
View File

@ -503,6 +503,14 @@ typedef struct H264Context{
*/
SEI_PicStructType sei_pic_struct;
/**
* Complement sei_pic_struct
* SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
* However, soft telecined frames may have these values.
* This is used in an attempt to flag soft telecine progressive.
*/
int prev_interlaced_frame;
/**
* Bit set of clock types for fields/frames in picture timing SEI message.
* For each found ct_type, appropriate bit is set (e.g., bit 1 for