about the function x264_nal_encode
hao jiang
txjhao at gmail.com
Sun Jul 17 19:41:21 PDT 2011
i checked the x264 daily
tarball<ftp://ftp.videolan.org/pub/videolan/x264/snapshots/>.
i found that the function "x264_nal_encode" has changed since 20100705.
before this day ,the function "x264_nal_encode" is defined as
<
/****************************************************************************
* x264_nal_encode:
****************************************************************************/
int x264_nal_encode( x264_t *h, uint8_t *dst, x264_nal_t *nal, int
b_long_startcode )
{
uint8_t *src = nal->p_payload;
uint8_t *end = nal->p_payload + nal->i_payload;
uint8_t *orig_dst = dst;
if( h->param.b_annexb )
{
if( b_long_startcode )
*dst++ = 0x00;
*dst++ = 0x00;
*dst++ = 0x00;
*dst++ = 0x01;
}
else /* save room for size later */
dst += 4;
/* nal header */
*dst++ = ( 0x00 << 7 ) | ( nal->i_ref_idc << 5 ) | nal->i_type;
dst = h->bsf.nal_escape( dst, src, end );
int size = (dst - orig_dst) - 4;
/* Write the size header for mp4/etc */
if( !h->param.b_annexb )
{
/* Size doesn't include the size of the header we're writing now. */
orig_dst[0] = size>>24;
orig_dst[1] = size>>16;
orig_dst[2] = size>> 8;
orig_dst[3] = size>> 0;
}
return size+4;
}
>
in the 20100705 daily tarball,the function "x264_nal_encode" was defined as
<
/****************************************************************************
* x264_nal_encode:
****************************************************************************/
void x264_nal_encode( x264_t *h, uint8_t *dst, x264_nal_t *nal )
{
uint8_t *src = nal->p_payload;
uint8_t *end = nal->p_payload + nal->i_payload;
uint8_t *orig_dst = dst;
if( h->param.b_annexb )
{
if( nal->b_long_startcode )
*dst++ = 0x00;
*dst++ = 0x00;
*dst++ = 0x00;
*dst++ = 0x01;
}
else /* save room for size later */
dst += 4;
/* nal header */
*dst++ = ( 0x00 << 7 ) | ( nal->i_ref_idc << 5 ) | nal->i_type;
dst = h->bsf.nal_escape( dst, src, end );
int size = (dst - orig_dst) - 4;
/* Write the size header for mp4/etc */
if( !h->param.b_annexb )
{
/* Size doesn't include the size of the header we're writing now. */
orig_dst[0] = size>>24;
orig_dst[1] = size>>16;
orig_dst[2] = size>> 8;
orig_dst[3] = size>> 0;
}
nal->i_payload = size+4;
nal->p_payload = orig_dst;
}
>
in the plugin-ugly ,the plugin x264enc use the function as
<
nal_size = x264_nal_encode (buffer + i_size + 2, &i_data, 0, &nal[sps_ni]);
>
is that mean i can't use the latest version of x264 when i use the lastest
version of gstx264enc?
--
Kang Ho
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