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Code Issues Releases Activity

libavcodec/snow: change AVFrame to pointers to AVFrame for ABI stability

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-10 23:43:52 +01:00
parent 1cefdc397e
commit cf06dee58d
4 changed files with 87 additions and 86 deletions
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68
libavcodec/snow.c
View File

@ -337,7 +337,7 @@ void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, int stride,
}
}
}else{
uint8_t *src= s->last_picture[block->ref].data[plane_index];
uint8_t *src= s->last_picture[block->ref]->data[plane_index];
const int scale= plane_index ? (2*s->mv_scale)>>s->chroma_h_shift : 2*s->mv_scale;
int mx= block->mx*scale;
int my= block->my*scale;
@ -461,11 +461,11 @@ av_cold int ff_snow_common_init(AVCodecContext *avctx){
for(i=0; i<MAX_REF_FRAMES; i++) {
for(j=0; j<MAX_REF_FRAMES; j++)
ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);
avcodec_get_frame_defaults(&s->last_picture[i]);
s->last_picture[i] = av_frame_alloc();
}
avcodec_get_frame_defaults(&s->mconly_picture);
avcodec_get_frame_defaults(&s->current_picture);
s->mconly_picture = av_frame_alloc();
s->current_picture = av_frame_alloc();
return 0;
fail:
@ -478,15 +478,15 @@ int ff_snow_common_init_after_header(AVCodecContext *avctx) {
int ret, emu_buf_size;
if(!s->scratchbuf) {
if ((ret = ff_get_buffer(s->avctx, &s->mconly_picture,
if ((ret = ff_get_buffer(s->avctx, s->mconly_picture,
AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
FF_ALLOCZ_OR_GOTO(avctx, s->scratchbuf, FFMAX(s->mconly_picture.linesize[0], 2*avctx->width+256)*7*MB_SIZE, fail);
emu_buf_size = FFMAX(s->mconly_picture.linesize[0], 2*avctx->width+256) * (2 * MB_SIZE + HTAPS_MAX - 1);
FF_ALLOCZ_OR_GOTO(avctx, s->scratchbuf, FFMAX(s->mconly_picture->linesize[0], 2*avctx->width+256)*7*MB_SIZE, fail);
emu_buf_size = FFMAX(s->mconly_picture->linesize[0], 2*avctx->width+256) * (2 * MB_SIZE + HTAPS_MAX - 1);
FF_ALLOC_OR_GOTO(avctx, s->emu_edge_buffer, emu_buf_size, fail);
}
if(s->mconly_picture.format != avctx->pix_fmt) {
if(s->mconly_picture->format != avctx->pix_fmt) {
av_log(avctx, AV_LOG_ERROR, "pixel format changed\n");
return AVERROR_INVALIDDATA;
}
@ -596,51 +596,51 @@ void ff_snow_release_buffer(AVCodecContext *avctx)
SnowContext *s = avctx->priv_data;
int i;
if(s->last_picture[s->max_ref_frames-1].data[0]){
av_frame_unref(&s->last_picture[s->max_ref_frames-1]);
if(s->last_picture[s->max_ref_frames-1]->data[0]){
av_frame_unref(s->last_picture[s->max_ref_frames-1]);
for(i=0; i<9; i++)
if(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3])
av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture.linesize[i%3]));
av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture->linesize[i%3]));
}
}
int ff_snow_frame_start(SnowContext *s){
AVFrame tmp;
AVFrame *tmp;
int i, ret;
int w= s->avctx->width; //FIXME round up to x16 ?
int h= s->avctx->height;
if (s->current_picture.data[0] && !(s->avctx->flags&CODEC_FLAG_EMU_EDGE)) {
s->dsp.draw_edges(s->current_picture.data[0],
s->current_picture.linesize[0], w , h ,
if (s->current_picture->data[0] && !(s->avctx->flags&CODEC_FLAG_EMU_EDGE)) {
s->dsp.draw_edges(s->current_picture->data[0],
s->current_picture->linesize[0], w , h ,
EDGE_WIDTH , EDGE_WIDTH , EDGE_TOP | EDGE_BOTTOM);
s->dsp.draw_edges(s->current_picture.data[1],
s->current_picture.linesize[1], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
s->dsp.draw_edges(s->current_picture->data[1],
s->current_picture->linesize[1], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
EDGE_WIDTH>>s->chroma_h_shift, EDGE_WIDTH>>s->chroma_v_shift, EDGE_TOP | EDGE_BOTTOM);
s->dsp.draw_edges(s->current_picture.data[2],
s->current_picture.linesize[2], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
s->dsp.draw_edges(s->current_picture->data[2],
s->current_picture->linesize[2], w>>s->chroma_h_shift, h>>s->chroma_v_shift,
EDGE_WIDTH>>s->chroma_h_shift, EDGE_WIDTH>>s->chroma_v_shift, EDGE_TOP | EDGE_BOTTOM);
}
ff_snow_release_buffer(s->avctx);
av_frame_move_ref(&tmp, &s->last_picture[s->max_ref_frames-1]);
tmp= s->last_picture[s->max_ref_frames-1];
for(i=s->max_ref_frames-1; i>0; i--)
av_frame_move_ref(&s->last_picture[i], &s->last_picture[i-1]);
s->last_picture[i] = s->last_picture[i-1];
memmove(s->halfpel_plane+1, s->halfpel_plane, (s->max_ref_frames-1)*sizeof(void*)*4*4);
if(USE_HALFPEL_PLANE && s->current_picture.data[0]) {
if((ret = halfpel_interpol(s, s->halfpel_plane[0], &s->current_picture)) < 0)
if(USE_HALFPEL_PLANE && s->current_picture->data[0]) {
if((ret = halfpel_interpol(s, s->halfpel_plane[0], s->current_picture)) < 0)
return ret;
}
av_frame_move_ref(&s->last_picture[0], &s->current_picture);
av_frame_move_ref(&s->current_picture, &tmp);
s->last_picture[0] = s->current_picture;
s->current_picture = tmp;
if(s->keyframe){
s->ref_frames= 0;
}else{
int i;
for(i=0; i<s->max_ref_frames && s->last_picture[i].data[0]; i++)
if(i && s->last_picture[i-1].key_frame)
for(i=0; i<s->max_ref_frames && s->last_picture[i]->data[0]; i++)
if(i && s->last_picture[i-1]->key_frame)
break;
s->ref_frames= i;
if(s->ref_frames==0){
@ -649,10 +649,10 @@ int ff_snow_frame_start(SnowContext *s){
}
}
if ((ret = ff_get_buffer(s->avctx, &s->current_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
if ((ret = ff_get_buffer(s->avctx, s->current_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
s->current_picture.key_frame= s->keyframe;
s->current_picture->key_frame= s->keyframe;
return 0;
}
@ -680,10 +680,10 @@ av_cold void ff_snow_common_end(SnowContext *s)
for(i=0; i<MAX_REF_FRAMES; i++){
av_freep(&s->ref_mvs[i]);
av_freep(&s->ref_scores[i]);
if(s->last_picture[i].data[0]) {
av_assert0(s->last_picture[i].data[0] != s->current_picture.data[0]);
av_frame_unref(&s->last_picture[i]);
if(s->last_picture[i]->data[0]) {
av_assert0(s->last_picture[i]->data[0] != s->current_picture->data[0]);
}
av_frame_free(&s->last_picture[i]);
}
for(plane_index=0; plane_index<3; plane_index++){
@ -695,6 +695,6 @@ av_cold void ff_snow_common_end(SnowContext *s)
}
}
}
av_frame_unref(&s->mconly_picture);
av_frame_unref(&s->current_picture);
av_frame_free(&s->mconly_picture);
av_frame_free(&s->current_picture);
}

14
libavcodec/snow.h
View File

@ -114,12 +114,12 @@ typedef struct SnowContext{
VideoDSPContext vdsp;
H264QpelContext h264qpel;
SnowDWTContext dwt;
AVFrame new_picture;
AVFrame input_picture; ///< new_picture with the internal linesizes
AVFrame current_picture;
AVFrame last_picture[MAX_REF_FRAMES];
AVFrame *new_picture;
AVFrame *input_picture; ///< new_picture with the internal linesizes
AVFrame *current_picture;
AVFrame *last_picture[MAX_REF_FRAMES];
uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4];
AVFrame mconly_picture;
AVFrame *mconly_picture;
// uint8_t q_context[16];
uint8_t header_state[32];
uint8_t block_state[128 + 32*128];
@ -414,8 +414,8 @@ static av_always_inline void predict_slice(SnowContext *s, IDWTELEM *buf, int pl
int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
int ref_stride= s->current_picture.linesize[plane_index];
uint8_t *dst8= s->current_picture.data[plane_index];
int ref_stride= s->current_picture->linesize[plane_index];
uint8_t *dst8= s->current_picture->data[plane_index];
int w= p->width;
int h= p->height;
av_assert2(s->chroma_h_shift == s->chroma_v_shift); // obmc params assume squares

14
libavcodec/snowdec.c
View File

@ -43,8 +43,8 @@ static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer
int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
int ref_stride= s->current_picture.linesize[plane_index];
uint8_t *dst8= s->current_picture.data[plane_index];
int ref_stride= s->current_picture->linesize[plane_index];
uint8_t *dst8= s->current_picture->data[plane_index];
int w= p->width;
int h= p->height;
@ -403,7 +403,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
ff_init_range_decoder(c, buf, buf_size);
ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
s->current_picture.pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
if(decode_header(s)<0)
return -1;
if ((res=ff_snow_common_init_after_header(avctx)) < 0)
@ -449,8 +449,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int v= s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x];
s->mconly_picture.data[plane_index][y*s->mconly_picture.linesize[plane_index] + x]= v;
int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
}
}
}
@ -548,9 +548,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
ff_snow_release_buffer(avctx);
if(!(s->avctx->debug&2048))
av_frame_ref(picture, &s->current_picture);
av_frame_ref(picture, s->current_picture);
else
av_frame_ref(picture, &s->mconly_picture);
av_frame_ref(picture, s->mconly_picture);
*got_frame = 1;

77
libavcodec/snowenc.c
View File

@ -103,7 +103,6 @@ static av_cold int encode_init(AVCodecContext *avctx)
}
s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));
avctx->coded_frame= &s->current_picture;
switch(avctx->pix_fmt){
case AV_PIX_FMT_YUV444P:
// case AV_PIX_FMT_YUV422P:
@ -125,7 +124,8 @@ static av_cold int encode_init(AVCodecContext *avctx)
ff_set_cmp(&s->dsp, s->dsp.me_cmp, s->avctx->me_cmp);
ff_set_cmp(&s->dsp, s->dsp.me_sub_cmp, s->avctx->me_sub_cmp);
if ((ret = ff_get_buffer(s->avctx, &s->input_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
s->input_picture = av_frame_alloc();
if ((ret = ff_get_buffer(s->avctx, s->input_picture, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if(s->avctx->me_method == ME_ITER){
@ -235,11 +235,11 @@ static int encode_q_branch(SnowContext *s, int level, int x, int y){
int pmx, pmy;
int mx=0, my=0;
int l,cr,cb;
const int stride= s->current_picture.linesize[0];
const int uvstride= s->current_picture.linesize[1];
uint8_t *current_data[3]= { s->input_picture.data[0] + (x + y* stride)*block_w,
s->input_picture.data[1] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift),
s->input_picture.data[2] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift)};
const int stride= s->current_picture->linesize[0];
const int uvstride= s->current_picture->linesize[1];
uint8_t *current_data[3]= { s->input_picture->data[0] + (x + y* stride)*block_w,
s->input_picture->data[1] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift),
s->input_picture->data[2] + ((x*block_w)>>s->chroma_h_shift) + ((y*uvstride*block_w)>>s->chroma_v_shift)};
int P[10][2];
int16_t last_mv[3][2];
int qpel= !!(s->avctx->flags & CODEC_FLAG_QPEL); //unused
@ -313,7 +313,7 @@ static int encode_q_branch(SnowContext *s, int level, int x, int y){
score= INT_MAX;
best_ref= 0;
for(ref=0; ref<s->ref_frames; ref++){
init_ref(c, current_data, s->last_picture[ref].data, NULL, block_w*x, block_w*y, 0);
init_ref(c, current_data, s->last_picture[ref]->data, NULL, block_w*x, block_w*y, 0);
ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,
(1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);
@ -493,8 +493,8 @@ static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
const int ref_stride= s->current_picture.linesize[plane_index];
uint8_t *src= s-> input_picture.data[plane_index];
const int ref_stride= s->current_picture->linesize[plane_index];
uint8_t *src= s-> input_picture->data[plane_index];
IDWTELEM *dst= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned
const int b_stride = s->b_width << s->block_max_depth;
const int w= p->width;
@ -587,9 +587,9 @@ static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, uin
const int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;
const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
const int ref_stride= s->current_picture.linesize[plane_index];
uint8_t *dst= s->current_picture.data[plane_index];
uint8_t *src= s-> input_picture.data[plane_index];
const int ref_stride= s->current_picture->linesize[plane_index];
uint8_t *dst= s->current_picture->data[plane_index];
uint8_t *src= s-> input_picture->data[plane_index];
IDWTELEM *pred= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4;
uint8_t *cur = s->scratchbuf;
uint8_t *tmp = s->emu_edge_buffer;
@ -690,9 +690,9 @@ static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
const int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
const int ref_stride= s->current_picture.linesize[plane_index];
uint8_t *dst= s->current_picture.data[plane_index];
uint8_t *src= s-> input_picture.data[plane_index];
const int ref_stride= s->current_picture->linesize[plane_index];
uint8_t *dst= s->current_picture->data[plane_index];
uint8_t *src= s-> input_picture->data[plane_index];
//FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst
// const has only been removed from zero_dst to suppress a warning
static IDWTELEM zero_dst[4096]; //FIXME
@ -1046,9 +1046,9 @@ static void iterative_me(SnowContext *s){
//skip stuff outside the picture
if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){
uint8_t *src= s-> input_picture.data[0];
uint8_t *dst= s->current_picture.data[0];
const int stride= s->current_picture.linesize[0];
uint8_t *src= s-> input_picture->data[0];
uint8_t *dst= s->current_picture->data[0];
const int stride= s->current_picture->linesize[0];
const int block_w= MB_SIZE >> s->block_max_depth;
const int block_h= MB_SIZE >> s->block_max_depth;
const int sx= block_w*mb_x - block_w/2;
@ -1539,7 +1539,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
{
SnowContext *s = avctx->priv_data;
RangeCoder * const c= &s->c;
AVFrame *pic = &s->new_picture;
AVFrame *pic = pict;
const int width= s->avctx->width;
const int height= s->avctx->height;
int level, orientation, plane_index, i, y, ret;
@ -1556,17 +1556,17 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
int hshift= i ? s->chroma_h_shift : 0;
int vshift= i ? s->chroma_v_shift : 0;
for(y=0; y<(height>>vshift); y++)
memcpy(&s->input_picture.data[i][y * s->input_picture.linesize[i]],
memcpy(&s->input_picture->data[i][y * s->input_picture->linesize[i]],
&pict->data[i][y * pict->linesize[i]],
width>>hshift);
s->dsp.draw_edges(s->input_picture.data[i], s->input_picture.linesize[i],
s->dsp.draw_edges(s->input_picture->data[i], s->input_picture->linesize[i],
width >> hshift, height >> vshift,
EDGE_WIDTH >> hshift, EDGE_WIDTH >> vshift,
EDGE_TOP | EDGE_BOTTOM);
}
emms_c();
s->new_picture = *pict;
s->new_picture = pict;
s->m.picture_number= avctx->frame_number;
if(avctx->flags&CODEC_FLAG_PASS2){
@ -1594,6 +1594,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
}//else keep previous frame's qlog until after motion estimation
ff_snow_frame_start(s);
avctx->coded_frame= s->current_picture;
s->m.current_picture_ptr= &s->m.current_picture;
s->m.last_picture.f.pts = s->m.current_picture.f.pts;
@ -1601,21 +1602,21 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
if(pic->pict_type == AV_PICTURE_TYPE_P){
int block_width = (width +15)>>4;
int block_height= (height+15)>>4;
int stride= s->current_picture.linesize[0];
int stride= s->current_picture->linesize[0];
av_assert0(s->current_picture.data[0]);
av_assert0(s->last_picture[0].data[0]);
av_assert0(s->current_picture->data[0]);
av_assert0(s->last_picture[0]->data[0]);
s->m.avctx= s->avctx;
s->m.current_picture.f.data[0] = s->current_picture.data[0];
s->m. last_picture.f.data[0] = s->last_picture[0].data[0];
s->m. new_picture.f.data[0] = s-> input_picture.data[0];
s->m.current_picture.f.data[0] = s->current_picture->data[0];
s->m. last_picture.f.data[0] = s->last_picture[0]->data[0];
s->m. new_picture.f.data[0] = s-> input_picture->data[0];
s->m. last_picture_ptr= &s->m. last_picture;
s->m.linesize=
s->m. last_picture.f.linesize[0] =
s->m. new_picture.f.linesize[0] =
s->m.current_picture.f.linesize[0] = stride;
s->m.uvlinesize= s->current_picture.linesize[1];
s->m.uvlinesize= s->current_picture->linesize[1];
s->m.width = width;
s->m.height= height;
s->m.mb_width = block_width;
@ -1704,7 +1705,7 @@ redo_frame:
ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
pic->pict_type= AV_PICTURE_TYPE_I;
s->keyframe=1;
s->current_picture.key_frame=1;
s->current_picture->key_frame=1;
goto redo_frame;
}
@ -1775,7 +1776,7 @@ redo_frame:
if(pic->pict_type == AV_PICTURE_TYPE_I){
for(y=0; y<h; y++){
for(x=0; x<w; x++){
s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x]=
s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x]=
pict->data[plane_index][y*pict->linesize[plane_index] + x];
}
}
@ -1790,12 +1791,12 @@ redo_frame:
if(pict->data[plane_index]) //FIXME gray hack
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int d= s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x] - pict->data[plane_index][y*pict->linesize[plane_index] + x];
int d= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x] - pict->data[plane_index][y*pict->linesize[plane_index] + x];
error += d*d;
}
}
s->avctx->error[plane_index] += error;
s->current_picture.error[plane_index] = error;
s->current_picture->error[plane_index] = error;
}
}
@ -1804,9 +1805,9 @@ redo_frame:
ff_snow_release_buffer(avctx);
s->current_picture.coded_picture_number = avctx->frame_number;
s->current_picture.pict_type = pict->pict_type;
s->current_picture.quality = pict->quality;
s->current_picture->coded_picture_number = avctx->frame_number;
s->current_picture->pict_type = pict->pict_type;
s->current_picture->quality = pict->quality;
s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
s->m.current_picture.f.display_picture_number =
@ -1840,7 +1841,7 @@ static av_cold int encode_end(AVCodecContext *avctx)
ff_snow_common_end(s);
ff_rate_control_uninit(&s->m);
av_frame_unref(&s->input_picture);
av_frame_free(&s->input_picture);
av_free(avctx->stats_out);
return 0;