Hi guys.
I am new to the libmpeg2,(0.51).
I follow the sample2.c try to extract the first I-frame
But I found the problem
when looping mpeg2_parse (decoder)
1.
STATE_PICTURE found
I check the flag to see if it is an I frame
pic_coding_type = info->current_picture->flags & PIC_MASK_CODING_TYPE;
2. STATE_SLICE found
then i try to extract the data ,but info->display_fbuf is NULL,so I can
get nothing.
How can I extract the first I-frame to ppm data?
source
do {
state = mpeg2_parse (decoder);
switch (state) {
case STATE_BUFFER:
size = fread (buffer, 1, BUFFER_SIZE, mpgfile);
mpeg2_buffer (decoder, buffer, buffer + size);
break;
case STATE_SEQUENCE:
mpeg2_convert (decoder, mpeg2convert_rgb24, NULL);
break;
case STATE_PICTURE:
pic_coding_type = info->current_picture->flags & PIC_MASK_CODING_TYPE;
break;
case STATE_SLICE:
case STATE_END:
case STATE_INVALID_END:
if (info->display_fbuf && pic_coding_type == PIC_FLAG_CODING_TYPE_I
)
save_ppm (info->sequence->width, info->sequence->height,
info->display_fbuf->buf[0], framenum++);
break;
default:
break;
}
thanks in advance
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