4-27 x264_frame_copy_picture
dst->i_type = src->i_type;
dst->i_qpplus1 = src->i_qpplus1;
//printf("src->i_pts is [%d]\n",src->i_pts);
dst->i_pts = dst->i_reordered_pts = src->i_pts;
dst->param = src->param;
dst->i_pic_struct = src->i_pic_struct;
dst->extra_sei = src->extra_sei;
dst->opaque = src->opaque;
初步对于当前帧的 i_type ，i_qpplus1，i_pts，param，i_pic_struct，extra_sei,opaque赋值
I_pts貌似和帧的数目是一致的，从1到217 pts dts 的一些解释http://www.cnblogs.com/qingquan/archive/2011/07/27/2118967.html
I_pic_struct中指明的是当前帧类型，是帧或者场，看定义里面还有double frame和triple frame的设置
I_type编码帧的类型，ipb之类的，这里应该只是初始化一下。全部都是0
I_qpplus1 注释是 force quantizer for ！= X264_QP_AUTO 应该是跟量化器相关的设置
Param 就是最开始那个x264_param
Void *opaque 注释 private user data，copies from input to output frames
函数get_plane_ptr() 就是为了 最开始定义的 pix[3] 和 stride[3]赋值
调用参数 get_plane_ptr( h, src, &pix[0], &stride[0], 0, 0, 0 );
uint8_t *pix[3];
int stride[3];
h->param.i_width (1920),h->param->height(1080)就是要编码帧的宽度和高度
只是为了对于临时数组里面做一些基本赋值
static int get_plane_ptr( x264_t *h, x264_picture_t *src, uint8_t **pix, int *stride, int plane, int xshift, int yshift )
{
int width = h->param.i_width >> xshift;
int height = h->param.i_height >> yshift;
*pix = src->img.plane[plane];
//应该是亮度和色度的 1920 960 960 这样交替出现的，1920应该是一行中色度的取值
//横向的 cb和 cr都是亮度一般 所以两个960
*stride = src->img.i_stride[plane];
if( src->img.i_csp & X264_CSP_VFLIP )
{ //这里没有执行
*pix += (height-1) * *stride;
*stride = -*stride;
}
if( width > abs(*stride) )
{
x264_log( h, X264_LOG_ERROR, "Input picture width (%d) is greater than stride (%d)\n", width, *stride );
return -1;
}
return 0;
}
int x264_frame_copy_picture( x264_t *h, x264_frame_t *dst, x264_picture_t *src )
{
int i_csp = src->img.i_csp & X264_CSP_MASK;
if( i_csp <= X264_CSP_NONE || i_csp >= X264_CSP_MAX )
{
x264_log( h, X264_LOG_ERROR, "Invalid input colorspace\n" );
return -1;
}
#if HIGH_BIT_DEPTH
if( !(src->img.i_csp & X264_CSP_HIGH_DEPTH) )
{
x264_log( h, X264_LOG_ERROR, "This build of x264 requires high depth input. Rebuild to support 8-bit input.\n" );
return -1;
}
#else
if( src->img.i_csp & X264_CSP_HIGH_DEPTH )
{
x264_log( h, X264_LOG_ERROR, "This build of x264 requires 8-bit input. Rebuild to support high depth input.\n" );
return -1;
}
#endif
dst->i_type = src->i_type;
//printf("[%d]",dst->i_type);
dst->i_qpplus1 = src->i_qpplus1;
//printf("src->i_pts is [%d]\n",src->i_pts);
dst->i_pts = dst->i_reordered_pts = src->i_pts;
dst->param = src->param;
dst->i_pic_struct = src->i_pic_struct;
dst->extra_sei = src->extra_sei;
dst->opaque = src->opaque;
uint8_t *pix[3];
int stride[3];
if ( i_csp >= X264_CSP_BGR ) //YUV小于RGB的
{
printf("===============================error of my thingking===================");
stride[0] = src->img.i_stride[0];
pix[0] = src->img.plane[0];
if( src->img.i_csp & X264_CSP_VFLIP )
{
pix[0] += (h->param.i_height-1) * stride[0];
stride[0] = -stride[0];
}
int b = i_csp==X264_CSP_RGB;
h->mc.plane_copy_deinterleave_rgb( dst->plane[1+b], dst->i_stride[1+b],
dst->plane[0], dst->i_stride[0],
dst->plane[2-b], dst->i_stride[2-b],
(pixel*)pix[0], stride[0]/sizeof(pixel), i_csp==X264_CSP_BGRA ? 4 : 3, h->param.i_width, h->param.i_height );
}
else
{
int v_shift = CHROMA_V_SHIFT;
get_plane_ptr( h, src, &pix[0], &stride[0], 0, 0, 0 );
//只是做了内存拷贝 下面有这个函数的实现 mc.c
h->mc.plane_copy( dst->plane[0], dst->i_stride[0], (pixel*)pix[0],
stride[0]/sizeof(pixel), h->param.i_width, h->param.i_height );
if( i_csp == X264_CSP_NV12 || i_csp == X264_CSP_NV16 )
{
printf("i_csp == X264_CSP_NV12 || i_csp == X264_CSP_NV16 1\n");
get_plane_ptr( h, src, &pix[1], &stride[1], 1, 0, v_shift );
h->mc.plane_copy( dst->plane[1], dst->i_stride[1], (pixel*)pix[1],
stride[1]/sizeof(pixel), h->param.i_width, h->param.i_height>>v_shift );
}
//ics == x264_csp_i420
else if( i_csp == X264_CSP_I420 || i_csp == X264_CSP_I422 || i_csp == X264_CSP_YV12 || i_csp == X264_CSP_YV16 )
{ //printf("====================2==========\n excute here");
int uv_swap = i_csp == X264_CSP_YV12 || i_csp == X264_CSP_YV16;
get_plane_ptr( h, src, &pix[1], &stride[1], uv_swap ? 2 : 1, 1, v_shift );
get_plane_ptr( h, src, &pix[2], &stride[2], uv_swap ? 1 : 2, 1, v_shift );
h->mc.plane_copy_interleave( dst->plane[1], dst->i_stride[1],
(pixel*)pix[1], stride[1]/sizeof(pixel),
(pixel*)pix[2], stride[2]/sizeof(pixel),
h->param.i_width>>1, h->param.i_height>>v_shift );
/*****************************h recreate memory to store the picture**************************/
//printf("the x264_picture memoryis %d \n");
//printf("the x264_t memory is %d\n");
/*****************************h recreate memory to store the picture**************************/
}
else //if( i_csp == X264_CSP_I444 || i_csp == X264_CSP_YV24 )
{ printf("===================3===================\n");
get_plane_ptr( h, src, &pix[1], &stride[1], i_csp==X264_CSP_I444 ? 1 : 2, 0, 0 );
get_plane_ptr( h, src, &pix[2], &stride[2], i_csp==X264_CSP_I444 ? 2 : 1, 0, 0 );
h->mc.plane_copy( dst->plane[1], dst->i_stride[1], (pixel*)pix[1],
stride[1]/sizeof(pixel), h->param.i_width, h->param.i_height );
h->mc.plane_copy( dst->plane[2], dst->i_stride[2], (pixel*)pix[2],
stride[2]/sizeof(pixel), h->param.i_width, h->param.i_height );
}
}
return 0;
}
void x264_plane_copy_c( pixel *dst, intptr_t i_dst,
pixel *src, intptr_t i_src, int w, int h )
{
while( h-- )
{
memcpy( dst, src, w * sizeof(pixel) );
dst += i_dst;
src += i_src;
}
}
void x264_plane_copy_interleave_c( pixel *dst, intptr_t i_dst,
pixel *srcu, intptr_t i_srcu,
pixel *srcv, intptr_t i_srcv, int w, int h )
{
for( int y=0; y<h; y++, dst+=i_dst, srcu+=i_srcu, srcv+=i_srcv )
for( int x=0; x<w; x++ )
{
dst[2*x] = srcu[x];
dst[2*x+1] = srcv[x];
}
}
