Preparatory patch for high bit depth h264 decoding support.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Oskar Arvidsson
Ronald S. Bultje
parent
42239ced65
commit
563c72dabb
@ -29,264 +29,7 @@
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#include "avcodec.h"
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#include "h264dsp.h"
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#define op_scale1(x) block[x] = av_clip_uint8( (block[x]*weight + offset) >> log2_denom )
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#define op_scale2(x) dst[x] = av_clip_uint8( (src[x]*weights + dst[x]*weightd + offset) >> (log2_denom+1))
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#define H264_WEIGHT(W,H) \
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static void weight_h264_pixels ## W ## x ## H ## _c(uint8_t *block, int stride, int log2_denom, int weight, int offset){ \
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int y; \
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offset <<= log2_denom; \
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if(log2_denom) offset += 1<<(log2_denom-1); \
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for(y=0; y<H; y++, block += stride){ \
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op_scale1(0); \
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op_scale1(1); \
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if(W==2) continue; \
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op_scale1(2); \
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op_scale1(3); \
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if(W==4) continue; \
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op_scale1(4); \
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op_scale1(5); \
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op_scale1(6); \
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op_scale1(7); \
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if(W==8) continue; \
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op_scale1(8); \
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op_scale1(9); \
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op_scale1(10); \
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op_scale1(11); \
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op_scale1(12); \
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op_scale1(13); \
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op_scale1(14); \
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op_scale1(15); \
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} \
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} \
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static void biweight_h264_pixels ## W ## x ## H ## _c(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offset){ \
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int y; \
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offset = ((offset + 1) | 1) << log2_denom; \
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for(y=0; y<H; y++, dst += stride, src += stride){ \
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op_scale2(0); \
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op_scale2(1); \
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if(W==2) continue; \
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op_scale2(2); \
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op_scale2(3); \
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if(W==4) continue; \
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op_scale2(4); \
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op_scale2(5); \
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op_scale2(6); \
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op_scale2(7); \
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if(W==8) continue; \
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op_scale2(8); \
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op_scale2(9); \
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op_scale2(10); \
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op_scale2(11); \
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op_scale2(12); \
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op_scale2(13); \
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op_scale2(14); \
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op_scale2(15); \
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} \
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}
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H264_WEIGHT(16,16)
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H264_WEIGHT(16,8)
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H264_WEIGHT(8,16)
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H264_WEIGHT(8,8)
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H264_WEIGHT(8,4)
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H264_WEIGHT(4,8)
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H264_WEIGHT(4,4)
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H264_WEIGHT(4,2)
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H264_WEIGHT(2,4)
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H264_WEIGHT(2,2)
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#undef op_scale1
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#undef op_scale2
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#undef H264_WEIGHT
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static av_always_inline av_flatten void h264_loop_filter_luma_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta, int8_t *tc0)
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{
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int i, d;
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for( i = 0; i < 4; i++ ) {
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if( tc0[i] < 0 ) {
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pix += inner_iters*ystride;
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continue;
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}
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for( d = 0; d < inner_iters; d++ ) {
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const int p0 = pix[-1*xstride];
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const int p1 = pix[-2*xstride];
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const int p2 = pix[-3*xstride];
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const int q0 = pix[0];
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const int q1 = pix[1*xstride];
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const int q2 = pix[2*xstride];
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if( FFABS( p0 - q0 ) < alpha &&
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FFABS( p1 - p0 ) < beta &&
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FFABS( q1 - q0 ) < beta ) {
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int tc = tc0[i];
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int i_delta;
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if( FFABS( p2 - p0 ) < beta ) {
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if(tc0[i])
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pix[-2*xstride] = p1 + av_clip( (( p2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - p1, -tc0[i], tc0[i] );
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tc++;
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}
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if( FFABS( q2 - q0 ) < beta ) {
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if(tc0[i])
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pix[ xstride] = q1 + av_clip( (( q2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - q1, -tc0[i], tc0[i] );
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tc++;
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}
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i_delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
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pix[-xstride] = av_clip_uint8( p0 + i_delta ); /* p0' */
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pix[0] = av_clip_uint8( q0 - i_delta ); /* q0' */
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}
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pix += ystride;
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}
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}
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}
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static void h264_v_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_luma_c(pix, stride, 1, 4, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_luma_c(pix, 1, stride, 4, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_luma_mbaff_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_luma_c(pix, 1, stride, 2, alpha, beta, tc0);
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}
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static av_always_inline av_flatten void h264_loop_filter_luma_intra_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta)
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{
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int d;
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for( d = 0; d < 4 * inner_iters; d++ ) {
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const int p2 = pix[-3*xstride];
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const int p1 = pix[-2*xstride];
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const int p0 = pix[-1*xstride];
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const int q0 = pix[ 0*xstride];
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const int q1 = pix[ 1*xstride];
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const int q2 = pix[ 2*xstride];
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if( FFABS( p0 - q0 ) < alpha &&
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FFABS( p1 - p0 ) < beta &&
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FFABS( q1 - q0 ) < beta ) {
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if(FFABS( p0 - q0 ) < (( alpha >> 2 ) + 2 )){
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if( FFABS( p2 - p0 ) < beta)
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{
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const int p3 = pix[-4*xstride];
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/* p0', p1', p2' */
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pix[-1*xstride] = ( p2 + 2*p1 + 2*p0 + 2*q0 + q1 + 4 ) >> 3;
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pix[-2*xstride] = ( p2 + p1 + p0 + q0 + 2 ) >> 2;
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pix[-3*xstride] = ( 2*p3 + 3*p2 + p1 + p0 + q0 + 4 ) >> 3;
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} else {
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/* p0' */
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pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
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}
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if( FFABS( q2 - q0 ) < beta)
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{
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const int q3 = pix[3*xstride];
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/* q0', q1', q2' */
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pix[0*xstride] = ( p1 + 2*p0 + 2*q0 + 2*q1 + q2 + 4 ) >> 3;
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pix[1*xstride] = ( p0 + q0 + q1 + q2 + 2 ) >> 2;
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pix[2*xstride] = ( 2*q3 + 3*q2 + q1 + q0 + p0 + 4 ) >> 3;
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} else {
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/* q0' */
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pix[0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
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}
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}else{
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/* p0', q0' */
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pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
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pix[ 0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
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}
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}
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pix += ystride;
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}
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}
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static void h264_v_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_luma_intra_c(pix, stride, 1, 4, alpha, beta);
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}
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static void h264_h_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_luma_intra_c(pix, 1, stride, 4, alpha, beta);
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}
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static void h264_h_loop_filter_luma_mbaff_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_luma_intra_c(pix, 1, stride, 2, alpha, beta);
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}
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static av_always_inline av_flatten void h264_loop_filter_chroma_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta, int8_t *tc0)
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{
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int i, d;
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for( i = 0; i < 4; i++ ) {
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const int tc = tc0[i];
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if( tc <= 0 ) {
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pix += inner_iters*ystride;
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continue;
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}
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for( d = 0; d < inner_iters; d++ ) {
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const int p0 = pix[-1*xstride];
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const int p1 = pix[-2*xstride];
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const int q0 = pix[0];
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const int q1 = pix[1*xstride];
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if( FFABS( p0 - q0 ) < alpha &&
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FFABS( p1 - p0 ) < beta &&
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FFABS( q1 - q0 ) < beta ) {
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int delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
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pix[-xstride] = av_clip_uint8( p0 + delta ); /* p0' */
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pix[0] = av_clip_uint8( q0 - delta ); /* q0' */
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}
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pix += ystride;
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}
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}
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}
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static void h264_v_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_chroma_c(pix, stride, 1, 2, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_chroma_c(pix, 1, stride, 2, alpha, beta, tc0);
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}
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static void h264_h_loop_filter_chroma_mbaff_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
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{
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h264_loop_filter_chroma_c(pix, 1, stride, 1, alpha, beta, tc0);
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}
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static av_always_inline av_flatten void h264_loop_filter_chroma_intra_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta)
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{
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int d;
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for( d = 0; d < 4 * inner_iters; d++ ) {
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const int p0 = pix[-1*xstride];
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const int p1 = pix[-2*xstride];
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const int q0 = pix[0];
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const int q1 = pix[1*xstride];
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if( FFABS( p0 - q0 ) < alpha &&
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FFABS( p1 - p0 ) < beta &&
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FFABS( q1 - q0 ) < beta ) {
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pix[-xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2; /* p0' */
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pix[0] = ( 2*q1 + q0 + p1 + 2 ) >> 2; /* q0' */
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}
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pix += ystride;
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}
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}
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static void h264_v_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_chroma_intra_c(pix, stride, 1, 2, alpha, beta);
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}
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static void h264_h_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_chroma_intra_c(pix, 1, stride, 2, alpha, beta);
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}
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static void h264_h_loop_filter_chroma_mbaff_intra_c(uint8_t *pix, int stride, int alpha, int beta)
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{
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h264_loop_filter_chroma_intra_c(pix, 1, stride, 1, alpha, beta);
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}
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#include "h264dsp_template.c"
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void ff_h264dsp_init(H264DSPContext *c)
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{
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285
libavcodec/h264dsp_template.c
Normal file
285
libavcodec/h264dsp_template.c
Normal file
@ -0,0 +1,285 @@
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/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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* Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.264 / AVC / MPEG4 part10 DSP functions.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#define op_scale1(x) block[x] = av_clip_uint8( (block[x]*weight + offset) >> log2_denom )
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#define op_scale2(x) dst[x] = av_clip_uint8( (src[x]*weights + dst[x]*weightd + offset) >> (log2_denom+1))
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#define H264_WEIGHT(W,H) \
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static void weight_h264_pixels ## W ## x ## H ## _c(uint8_t *block, int stride, int log2_denom, int weight, int offset){ \
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int y; \
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offset <<= log2_denom; \
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if(log2_denom) offset += 1<<(log2_denom-1); \
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for(y=0; y<H; y++, block += stride){ \
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op_scale1(0); \
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op_scale1(1); \
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if(W==2) continue; \
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op_scale1(2); \
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op_scale1(3); \
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if(W==4) continue; \
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op_scale1(4); \
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op_scale1(5); \
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op_scale1(6); \
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op_scale1(7); \
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if(W==8) continue; \
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op_scale1(8); \
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op_scale1(9); \
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op_scale1(10); \
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op_scale1(11); \
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op_scale1(12); \
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op_scale1(13); \
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op_scale1(14); \
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op_scale1(15); \
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} \
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} \
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static void biweight_h264_pixels ## W ## x ## H ## _c(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offset){ \
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int y; \
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offset = ((offset + 1) | 1) << log2_denom; \
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for(y=0; y<H; y++, dst += stride, src += stride){ \
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op_scale2(0); \
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op_scale2(1); \
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if(W==2) continue; \
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op_scale2(2); \
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op_scale2(3); \
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if(W==4) continue; \
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op_scale2(4); \
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op_scale2(5); \
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op_scale2(6); \
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op_scale2(7); \
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if(W==8) continue; \
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op_scale2(8); \
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op_scale2(9); \
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op_scale2(10); \
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op_scale2(11); \
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op_scale2(12); \
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op_scale2(13); \
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op_scale2(14); \
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op_scale2(15); \
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} \
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}
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H264_WEIGHT(16,16)
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H264_WEIGHT(16,8)
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H264_WEIGHT(8,16)
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H264_WEIGHT(8,8)
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H264_WEIGHT(8,4)
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H264_WEIGHT(4,8)
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H264_WEIGHT(4,4)
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H264_WEIGHT(4,2)
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H264_WEIGHT(2,4)
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H264_WEIGHT(2,2)
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#undef op_scale1
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#undef op_scale2
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#undef H264_WEIGHT
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static av_always_inline av_flatten void h264_loop_filter_luma_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta, int8_t *tc0)
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{
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int i, d;
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for( i = 0; i < 4; i++ ) {
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if( tc0[i] < 0 ) {
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pix += inner_iters*ystride;
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continue;
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}
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for( d = 0; d < inner_iters; d++ ) {
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const int p0 = pix[-1*xstride];
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const int p1 = pix[-2*xstride];
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const int p2 = pix[-3*xstride];
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const int q0 = pix[0];
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const int q1 = pix[1*xstride];
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const int q2 = pix[2*xstride];
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if( FFABS( p0 - q0 ) < alpha &&
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FFABS( p1 - p0 ) < beta &&
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FFABS( q1 - q0 ) < beta ) {
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int tc = tc0[i];
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int i_delta;
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if( FFABS( p2 - p0 ) < beta ) {
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if(tc0[i])
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pix[-2*xstride] = p1 + av_clip( (( p2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - p1, -tc0[i], tc0[i] );
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tc++;
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}
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if( FFABS( q2 - q0 ) < beta ) {
|
||||
if(tc0[i])
|
||||
pix[ xstride] = q1 + av_clip( (( q2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - q1, -tc0[i], tc0[i] );
|
||||
tc++;
|
||||
}
|
||||
|
||||
i_delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
|
||||
pix[-xstride] = av_clip_uint8( p0 + i_delta ); /* p0' */
|
||||
pix[0] = av_clip_uint8( q0 - i_delta ); /* q0' */
|
||||
}
|
||||
pix += ystride;
|
||||
}
|
||||
}
|
||||
}
|
||||
static void h264_v_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_luma_c(pix, stride, 1, 4, alpha, beta, tc0);
|
||||
}
|
||||
static void h264_h_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_luma_c(pix, 1, stride, 4, alpha, beta, tc0);
|
||||
}
|
||||
static void h264_h_loop_filter_luma_mbaff_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_luma_c(pix, 1, stride, 2, alpha, beta, tc0);
|
||||
}
|
||||
|
||||
static av_always_inline av_flatten void h264_loop_filter_luma_intra_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta)
|
||||
{
|
||||
int d;
|
||||
for( d = 0; d < 4 * inner_iters; d++ ) {
|
||||
const int p2 = pix[-3*xstride];
|
||||
const int p1 = pix[-2*xstride];
|
||||
const int p0 = pix[-1*xstride];
|
||||
|
||||
const int q0 = pix[ 0*xstride];
|
||||
const int q1 = pix[ 1*xstride];
|
||||
const int q2 = pix[ 2*xstride];
|
||||
|
||||
if( FFABS( p0 - q0 ) < alpha &&
|
||||
FFABS( p1 - p0 ) < beta &&
|
||||
FFABS( q1 - q0 ) < beta ) {
|
||||
|
||||
if(FFABS( p0 - q0 ) < (( alpha >> 2 ) + 2 )){
|
||||
if( FFABS( p2 - p0 ) < beta)
|
||||
{
|
||||
const int p3 = pix[-4*xstride];
|
||||
/* p0', p1', p2' */
|
||||
pix[-1*xstride] = ( p2 + 2*p1 + 2*p0 + 2*q0 + q1 + 4 ) >> 3;
|
||||
pix[-2*xstride] = ( p2 + p1 + p0 + q0 + 2 ) >> 2;
|
||||
pix[-3*xstride] = ( 2*p3 + 3*p2 + p1 + p0 + q0 + 4 ) >> 3;
|
||||
} else {
|
||||
/* p0' */
|
||||
pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
|
||||
}
|
||||
if( FFABS( q2 - q0 ) < beta)
|
||||
{
|
||||
const int q3 = pix[3*xstride];
|
||||
/* q0', q1', q2' */
|
||||
pix[0*xstride] = ( p1 + 2*p0 + 2*q0 + 2*q1 + q2 + 4 ) >> 3;
|
||||
pix[1*xstride] = ( p0 + q0 + q1 + q2 + 2 ) >> 2;
|
||||
pix[2*xstride] = ( 2*q3 + 3*q2 + q1 + q0 + p0 + 4 ) >> 3;
|
||||
} else {
|
||||
/* q0' */
|
||||
pix[0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
|
||||
}
|
||||
}else{
|
||||
/* p0', q0' */
|
||||
pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;
|
||||
pix[ 0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;
|
||||
}
|
||||
}
|
||||
pix += ystride;
|
||||
}
|
||||
}
|
||||
static void h264_v_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_luma_intra_c(pix, stride, 1, 4, alpha, beta);
|
||||
}
|
||||
static void h264_h_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_luma_intra_c(pix, 1, stride, 4, alpha, beta);
|
||||
}
|
||||
static void h264_h_loop_filter_luma_mbaff_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_luma_intra_c(pix, 1, stride, 2, alpha, beta);
|
||||
}
|
||||
|
||||
static av_always_inline av_flatten void h264_loop_filter_chroma_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
int i, d;
|
||||
for( i = 0; i < 4; i++ ) {
|
||||
const int tc = tc0[i];
|
||||
if( tc <= 0 ) {
|
||||
pix += inner_iters*ystride;
|
||||
continue;
|
||||
}
|
||||
for( d = 0; d < inner_iters; d++ ) {
|
||||
const int p0 = pix[-1*xstride];
|
||||
const int p1 = pix[-2*xstride];
|
||||
const int q0 = pix[0];
|
||||
const int q1 = pix[1*xstride];
|
||||
|
||||
if( FFABS( p0 - q0 ) < alpha &&
|
||||
FFABS( p1 - p0 ) < beta &&
|
||||
FFABS( q1 - q0 ) < beta ) {
|
||||
|
||||
int delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );
|
||||
|
||||
pix[-xstride] = av_clip_uint8( p0 + delta ); /* p0' */
|
||||
pix[0] = av_clip_uint8( q0 - delta ); /* q0' */
|
||||
}
|
||||
pix += ystride;
|
||||
}
|
||||
}
|
||||
}
|
||||
static void h264_v_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_chroma_c(pix, stride, 1, 2, alpha, beta, tc0);
|
||||
}
|
||||
static void h264_h_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_chroma_c(pix, 1, stride, 2, alpha, beta, tc0);
|
||||
}
|
||||
static void h264_h_loop_filter_chroma_mbaff_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)
|
||||
{
|
||||
h264_loop_filter_chroma_c(pix, 1, stride, 1, alpha, beta, tc0);
|
||||
}
|
||||
|
||||
static av_always_inline av_flatten void h264_loop_filter_chroma_intra_c(uint8_t *pix, int xstride, int ystride, int inner_iters, int alpha, int beta)
|
||||
{
|
||||
int d;
|
||||
for( d = 0; d < 4 * inner_iters; d++ ) {
|
||||
const int p0 = pix[-1*xstride];
|
||||
const int p1 = pix[-2*xstride];
|
||||
const int q0 = pix[0];
|
||||
const int q1 = pix[1*xstride];
|
||||
|
||||
if( FFABS( p0 - q0 ) < alpha &&
|
||||
FFABS( p1 - p0 ) < beta &&
|
||||
FFABS( q1 - q0 ) < beta ) {
|
||||
|
||||
pix[-xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2; /* p0' */
|
||||
pix[0] = ( 2*q1 + q0 + p1 + 2 ) >> 2; /* q0' */
|
||||
}
|
||||
pix += ystride;
|
||||
}
|
||||
}
|
||||
static void h264_v_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_chroma_intra_c(pix, stride, 1, 2, alpha, beta);
|
||||
}
|
||||
static void h264_h_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_chroma_intra_c(pix, 1, stride, 2, alpha, beta);
|
||||
}
|
||||
static void h264_h_loop_filter_chroma_mbaff_intra_c(uint8_t *pix, int stride, int alpha, int beta)
|
||||
{
|
||||
h264_loop_filter_chroma_intra_c(pix, 1, stride, 1, alpha, beta);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user