static gboolean caps_handoff_cb( GstElement* p_ele, GstCaps *p_caps,
gpointer p_data )
{
VLC_UNUSED( p_ele );
decoder_t *p_dec = p_data;
decoder_sys_t *p_sys = p_dec->p_sys;
msg_Info( p_dec, "got new caps %s", gst_caps_to_string( p_caps ));
if( !gst_video_info_from_caps( &p_sys->vinfo, p_caps ))
{
msg_Err( p_dec, "failed to negotiate" );
return FALSE;
}
gst_vlc_dec_ensure_empty_queue( p_dec );
return gst_vlc_set_vout_fmt( &p_sys->vinfo, p_caps, p_dec );
}
static bool gst_vlc_video_info_from_vout( GstVideoInfo *p_info,
GstVideoAlignment *p_align, GstCaps *p_caps, decoder_t *p_dec,
picture_t *p_pic_info )
{
const GstVideoFormatInfo *p_vinfo = p_info->finfo;
picture_t *p_pic = NULL;
int i;
/* Ensure the queue is empty */
gst_vlc_dec_ensure_empty_queue( p_dec );
gst_video_info_align( p_info, p_align );
if( !gst_vlc_set_vout_fmt( p_info, p_align, p_caps, p_dec ))
{
msg_Err( p_dec, "failed to set output format to vout" );
return false;
}
/* Acquire a picture and release it. This is to get the picture
* stride/offsets info for the Gstreamer decoder looking to use
* downstream bufferpool directly; Zero-Copy */
if( !decoder_UpdateVideoFormat( p_dec ) )
p_pic = decoder_NewPicture( p_dec );
if( !p_pic )
{
msg_Err( p_dec, "failed to acquire picture from vout; for pic info" );
return false;
}
/* reject if strides don't match */
for( i = 0; i < p_pic->i_planes; i++ )
if( p_info->stride[i] != p_pic->p[i].i_pitch )
goto strides_mismatch;
p_info->offset[0] = 0;
for( i = 1; i < p_pic->i_planes; i++ )
{
p_info->offset[i] = p_info->offset[i-1] +
p_pic->p[i-1].i_pitch * p_pic->p[i-1].i_lines;
}
GST_VIDEO_INFO_SIZE( p_info ) = p_info->offset[i-1] +
p_pic->p[i-1].i_pitch * p_pic->p[i-1].i_lines;
for( i = 0; i < p_pic->i_planes; i++ )
{
int i_v_edge, i_h_edge;
i_h_edge =
GST_VIDEO_FORMAT_INFO_SCALE_WIDTH( p_vinfo, i,
p_align->padding_left);
i_v_edge =
GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT( p_vinfo, i,
p_align->padding_top);
p_info->offset[i] += ( i_v_edge * p_info->stride[i] ) +
( i_h_edge * GST_VIDEO_FORMAT_INFO_PSTRIDE( p_vinfo, i ));
}
memcpy( p_pic_info, p_pic, sizeof( picture_t ));
picture_Release( p_pic );
return true;
strides_mismatch:
msg_Err( p_dec, "strides mismatch" );
picture_Release( p_pic );
return false;
}
