static int pick_closest_supported_csp( int csp )
{
int pix_fmt = convert_csp_to_pix_fmt( csp );
switch( pix_fmt )
{
case PIX_FMT_YUV422P:
case PIX_FMT_YUV422P16LE:
case PIX_FMT_YUV422P16BE:
case PIX_FMT_YUYV422:
case PIX_FMT_UYVY422:
return X264_CSP_I422;
case PIX_FMT_YUV444P:
case PIX_FMT_YUV444P16LE:
case PIX_FMT_YUV444P16BE:
return X264_CSP_I444;
case PIX_FMT_RGB24: // convert rgb to bgr
case PIX_FMT_RGB48BE:
case PIX_FMT_RGB48LE:
case PIX_FMT_RGB565BE:
case PIX_FMT_RGB565LE:
case PIX_FMT_RGB555BE:
case PIX_FMT_RGB555LE:
case PIX_FMT_BGR24:
case PIX_FMT_BGR565BE:
case PIX_FMT_BGR565LE:
case PIX_FMT_BGR555BE:
case PIX_FMT_BGR555LE:
return X264_CSP_BGR;
case PIX_FMT_ARGB:
case PIX_FMT_RGBA:
case PIX_FMT_ABGR:
case PIX_FMT_BGRA:
return X264_CSP_BGRA;
case PIX_FMT_NV12:
case PIX_FMT_NV21:
return X264_CSP_NV12;
default:
return X264_CSP_I420;
}
}
static int pick_closest_supported_csp( int csp )
{
int pix_fmt = convert_csp_to_pix_fmt( csp );
// first determine the base csp
int ret = X264_CSP_NONE;
const AVPixFmtDescriptor *pix_desc = av_pix_fmt_descriptors+pix_fmt;
if( (unsigned)pix_fmt >= PIX_FMT_NB || !pix_desc->name )
return ret;
const char *pix_fmt_name = pix_desc->name;
int is_rgb = pix_desc->flags & (PIX_FMT_RGB | PIX_FMT_PAL);
int is_bgr = !!strstr( pix_fmt_name, "bgr" );
if( is_bgr || is_rgb )
{
if( pix_desc->nb_components == 4 ) // has alpha
ret = X264_CSP_BGRA;
else if( is_bgr )
ret = X264_CSP_BGR;
else
ret = X264_CSP_RGB;
}
else
{
// yuv-based
if( pix_desc->nb_components == 1 || pix_desc->nb_components == 2 ) // no chroma
ret = X264_CSP_I420;
else if( pix_desc->log2_chroma_w && pix_desc->log2_chroma_h ) // reduced chroma width & height
ret = (pix_number_of_planes( pix_desc ) == 2) ? X264_CSP_NV12 : X264_CSP_I420;
else if( pix_desc->log2_chroma_w ) // reduced chroma width only
ret = X264_CSP_I422; // X264_CSP_NV16 is not supported by swscale so don't use it
else
ret = X264_CSP_I444;
}
// now determine high depth
for( int i = 0; i < pix_desc->nb_components; i++ )
if( pix_desc->comp[i].depth_minus1 >= 8 )
ret |= X264_CSP_HIGH_DEPTH;
return ret;
}
