/*
  * SVQ1 Encoder
  * Copyright (C) 2004 Mike Melanson <melanson@pcisys.net>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * Sorenson Vector Quantizer #1 (SVQ1) video codec.
  * For more information of the SVQ1 algorithm, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  */
 
 
 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"

 #include "h263.h"

 #include "internal.h"

 
 #include "svq1.h"
 #include "svq1enc_cb.h"
 
 #undef NDEBUG
 #include <assert.h>
 
 
 typedef struct SVQ1Context {
     MpegEncContext m; // needed for motion estimation, should not be used for anything else, the idea is to make the motion estimation eventually independent of MpegEncContext, so this will be removed then (FIXME/XXX)
     AVCodecContext *avctx;
     DSPContext dsp;
     AVFrame picture;
     AVFrame current_picture;
     AVFrame last_picture;
     PutBitContext pb;
     GetBitContext gb;
 
     PutBitContext reorder_pb[6]; //why ooh why this sick breadth first order, everything is slower and more complex
 
     int frame_width;
     int frame_height;
 
     /* Y plane block dimensions */
     int y_block_width;
     int y_block_height;
 
     /* U & V plane (C planes) block dimensions */
     int c_block_width;
     int c_block_height;
 
     uint16_t *mb_type;
     uint32_t *dummy;
     int16_t (*motion_val8[3])[2];
     int16_t (*motion_val16[3])[2];
 
     int64_t rd_total;

 
     uint8_t *scratchbuf;

 } SVQ1Context;
 
 static void svq1_write_header(SVQ1Context *s, int frame_type)
 {
     int i;
 
     /* frame code */
     put_bits(&s->pb, 22, 0x20);
 
     /* temporal reference (sure hope this is a "don't care") */
     put_bits(&s->pb, 8, 0x00);
 
     /* frame type */
     put_bits(&s->pb, 2, frame_type - 1);
 

     if (frame_type == AV_PICTURE_TYPE_I) {

 
         /* no checksum since frame code is 0x20 */
 
         /* no embedded string either */
 
         /* output 5 unknown bits (2 + 2 + 1) */
         put_bits(&s->pb, 5, 2); /* 2 needed by quicktime decoder */
 

         i= ff_match_2uint16(ff_svq1_frame_size_table, FF_ARRAY_ELEMS(ff_svq1_frame_size_table), s->frame_width, s->frame_height);
         put_bits(&s->pb, 3, i);

 
         if (i == 7)
         {
                 put_bits(&s->pb, 12, s->frame_width);
                 put_bits(&s->pb, 12, s->frame_height);
         }
     }
 
     /* no checksum or extra data (next 2 bits get 0) */
     put_bits(&s->pb, 2, 0);
 }
 
 
 #define QUALITY_THRESHOLD 100
 #define THRESHOLD_MULTIPLIER 0.6
 

 #if HAVE_ALTIVEC

 #undef vector
 #endif
 
 static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *decoded, int stride, int level, int threshold, int lambda, int intra){
     int count, y, x, i, j, split, best_mean, best_score, best_count;
     int best_vector[6];
     int block_sum[7]= {0, 0, 0, 0, 0, 0};
     int w= 2<<((level+2)>>1);
     int h= 2<<((level+1)>>1);
     int size=w*h;
     int16_t block[7][256];
     const int8_t *codebook_sum, *codebook;
     const uint16_t (*mean_vlc)[2];
     const uint8_t (*multistage_vlc)[2];
 
     best_score=0;
     //FIXME optimize, this doenst need to be done multiple times
     if(intra){
         codebook_sum= svq1_intra_codebook_sum[level];
         codebook= ff_svq1_intra_codebooks[level];
         mean_vlc= ff_svq1_intra_mean_vlc;
         multistage_vlc= ff_svq1_intra_multistage_vlc[level];
         for(y=0; y<h; y++){
             for(x=0; x<w; x++){
                 int v= src[x + y*stride];
                 block[0][x + w*y]= v;
                 best_score += v*v;
                 block_sum[0] += v;
             }
         }
     }else{
         codebook_sum= svq1_inter_codebook_sum[level];
         codebook= ff_svq1_inter_codebooks[level];
         mean_vlc= ff_svq1_inter_mean_vlc + 256;
         multistage_vlc= ff_svq1_inter_multistage_vlc[level];
         for(y=0; y<h; y++){
             for(x=0; x<w; x++){
                 int v= src[x + y*stride] - ref[x + y*stride];
                 block[0][x + w*y]= v;
                 best_score += v*v;
                 block_sum[0] += v;
             }
         }
     }
 
     best_count=0;
     best_score -= ((block_sum[0]*block_sum[0])>>(level+3));
     best_mean= (block_sum[0] + (size>>1)) >> (level+3);
 
     if(level<4){
         for(count=1; count<7; count++){
             int best_vector_score= INT_MAX;
             int best_vector_sum=-999, best_vector_mean=-999;
             const int stage= count-1;
             const int8_t *vector;
 
             for(i=0; i<16; i++){
                 int sum= codebook_sum[stage*16 + i];
                 int sqr, diff, score;
 
                 vector = codebook + stage*size*16 + i*size;
                 sqr = s->dsp.ssd_int8_vs_int16(vector, block[stage], size);
                 diff= block_sum[stage] - sum;
                 score= sqr - ((diff*(int64_t)diff)>>(level+3)); //FIXME 64bit slooow
                 if(score < best_vector_score){
                     int mean= (diff + (size>>1)) >> (level+3);
                     assert(mean >-300 && mean<300);
                     mean= av_clip(mean, intra?0:-256, 255);
                     best_vector_score= score;
                     best_vector[stage]= i;
                     best_vector_sum= sum;
                     best_vector_mean= mean;
                 }
             }
             assert(best_vector_mean != -999);
             vector= codebook + stage*size*16 + best_vector[stage]*size;
             for(j=0; j<size; j++){
                 block[stage+1][j] = block[stage][j] - vector[j];
             }
             block_sum[stage+1]= block_sum[stage] - best_vector_sum;
             best_vector_score +=
                 lambda*(+ 1 + 4*count
                         + multistage_vlc[1+count][1]
                         + mean_vlc[best_vector_mean][1]);
 
             if(best_vector_score < best_score){
                 best_score= best_vector_score;
                 best_count= count;
                 best_mean= best_vector_mean;
             }
         }
     }
 
     split=0;
     if(best_score > threshold && level){
         int score=0;
         int offset= (level&1) ? stride*h/2 : w/2;
         PutBitContext backup[6];
 
         for(i=level-1; i>=0; i--){
             backup[i]= s->reorder_pb[i];
         }
         score += encode_block(s, src         , ref         , decoded         , stride, level-1, threshold>>1, lambda, intra);
         score += encode_block(s, src + offset, ref + offset, decoded + offset, stride, level-1, threshold>>1, lambda, intra);
         score += lambda;
 
         if(score < best_score){
             best_score= score;
             split=1;
         }else{
             for(i=level-1; i>=0; i--){
                 s->reorder_pb[i]= backup[i];
             }
         }
     }
     if (level > 0)
         put_bits(&s->reorder_pb[level], 1, split);
 
     if(!split){
         assert((best_mean >= 0 && best_mean<256) || !intra);
         assert(best_mean >= -256 && best_mean<256);
         assert(best_count >=0 && best_count<7);
         assert(level<4 || best_count==0);
 
         /* output the encoding */
         put_bits(&s->reorder_pb[level],
             multistage_vlc[1 + best_count][1],
             multistage_vlc[1 + best_count][0]);
         put_bits(&s->reorder_pb[level], mean_vlc[best_mean][1],
             mean_vlc[best_mean][0]);
 
         for (i = 0; i < best_count; i++){
             assert(best_vector[i]>=0 && best_vector[i]<16);
             put_bits(&s->reorder_pb[level], 4, best_vector[i]);
         }
 
         for(y=0; y<h; y++){
             for(x=0; x<w; x++){
                 decoded[x + y*stride]= src[x + y*stride] - block[best_count][x + w*y] + best_mean;
             }
         }
     }
 
     return best_score;
 }
 
 
 static int svq1_encode_plane(SVQ1Context *s, int plane, unsigned char *src_plane, unsigned char *ref_plane, unsigned char *decoded_plane,
     int width, int height, int src_stride, int stride)
 {
     int x, y;
     int i;
     int block_width, block_height;
     int level;
     int threshold[6];

     uint8_t *src = s->scratchbuf + stride * 16;

     const int lambda= (s->picture.quality*s->picture.quality) >> (2*FF_LAMBDA_SHIFT);
 
     /* figure out the acceptable level thresholds in advance */
     threshold[5] = QUALITY_THRESHOLD;
     for (level = 4; level >= 0; level--)
         threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;
 
     block_width = (width + 15) / 16;
     block_height = (height + 15) / 16;
 

     if(s->picture.pict_type == AV_PICTURE_TYPE_P){

         s->m.avctx= s->avctx;
         s->m.current_picture_ptr= &s->m.current_picture;
         s->m.last_picture_ptr   = &s->m.last_picture;
         s->m.last_picture.data[0]= ref_plane;
         s->m.linesize=
         s->m.last_picture.linesize[0]=
         s->m.new_picture.linesize[0]=
         s->m.current_picture.linesize[0]= stride;
         s->m.width= width;
         s->m.height= height;
         s->m.mb_width= block_width;
         s->m.mb_height= block_height;
         s->m.mb_stride= s->m.mb_width+1;
         s->m.b8_stride= 2*s->m.mb_width+1;
         s->m.f_code=1;
         s->m.pict_type= s->picture.pict_type;
         s->m.me_method= s->avctx->me_method;
         s->m.me.scene_change_score=0;
         s->m.flags= s->avctx->flags;
 //        s->m.out_format = FMT_H263;
 //        s->m.unrestricted_mv= 1;
 
         s->m.lambda= s->picture.quality;
         s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
         s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
 
         if(!s->motion_val8[plane]){
             s->motion_val8 [plane]= av_mallocz((s->m.b8_stride*block_height*2 + 2)*2*sizeof(int16_t));
             s->motion_val16[plane]= av_mallocz((s->m.mb_stride*(block_height + 2) + 1)*2*sizeof(int16_t));
         }
 
         s->m.mb_type= s->mb_type;
 
         //dummies, to avoid segfaults
         s->m.current_picture.mb_mean=   (uint8_t *)s->dummy;
         s->m.current_picture.mb_var=    (uint16_t*)s->dummy;
         s->m.current_picture.mc_mb_var= (uint16_t*)s->dummy;
         s->m.current_picture.mb_type= s->dummy;
 
         s->m.current_picture.motion_val[0]= s->motion_val8[plane] + 2;
         s->m.p_mv_table= s->motion_val16[plane] + s->m.mb_stride + 1;
         s->m.dsp= s->dsp; //move
         ff_init_me(&s->m);
 
         s->m.me.dia_size= s->avctx->dia_size;
         s->m.first_slice_line=1;
         for (y = 0; y < block_height; y++) {
             s->m.new_picture.data[0]= src - y*16*stride; //ugly
             s->m.mb_y= y;
 
             for(i=0; i<16 && i + 16*y<height; i++){
                 memcpy(&src[i*stride], &src_plane[(i+16*y)*src_stride], width);
                 for(x=width; x<16*block_width; x++)
                     src[i*stride+x]= src[i*stride+x-1];
             }
             for(; i<16 && i + 16*y<16*block_height; i++)
                 memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
 
             for (x = 0; x < block_width; x++) {
                 s->m.mb_x= x;
                 ff_init_block_index(&s->m);
                 ff_update_block_index(&s->m);
 
                 ff_estimate_p_frame_motion(&s->m, x, y);
             }
             s->m.first_slice_line=0;
         }
 
         ff_fix_long_p_mvs(&s->m);
         ff_fix_long_mvs(&s->m, NULL, 0, s->m.p_mv_table, s->m.f_code, CANDIDATE_MB_TYPE_INTER, 0);
     }
 
     s->m.first_slice_line=1;
     for (y = 0; y < block_height; y++) {
         for(i=0; i<16 && i + 16*y<height; i++){
             memcpy(&src[i*stride], &src_plane[(i+16*y)*src_stride], width);
             for(x=width; x<16*block_width; x++)
                 src[i*stride+x]= src[i*stride+x-1];
         }
         for(; i<16 && i + 16*y<16*block_height; i++)
             memcpy(&src[i*stride], &src[(i-1)*stride], 16*block_width);
 
         s->m.mb_y= y;
         for (x = 0; x < block_width; x++) {
             uint8_t reorder_buffer[3][6][7*32];
             int count[3][6];
             int offset = y * 16 * stride + x * 16;
             uint8_t *decoded= decoded_plane + offset;
             uint8_t *ref= ref_plane + offset;
             int score[4]={0,0,0,0}, best;

             uint8_t *temp = s->scratchbuf;

 
             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < 3000){ //FIXME check size
                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
                 return -1;
             }
 
             s->m.mb_x= x;
             ff_init_block_index(&s->m);
             ff_update_block_index(&s->m);
 

             if(s->picture.pict_type == AV_PICTURE_TYPE_I || (s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTRA)){

                 for(i=0; i<6; i++){
                     init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i], 7*32);
                 }

                 if(s->picture.pict_type == AV_PICTURE_TYPE_P){

                     const uint8_t *vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_INTRA];
                     put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
                     score[0]= vlc[1]*lambda;
                 }
                 score[0]+= encode_block(s, src+16*x, NULL, temp, stride, 5, 64, lambda, 1);
                 for(i=0; i<6; i++){
                     count[0][i]= put_bits_count(&s->reorder_pb[i]);
                     flush_put_bits(&s->reorder_pb[i]);
                 }
             }else
                 score[0]= INT_MAX;
 
             best=0;
 

             if(s->picture.pict_type == AV_PICTURE_TYPE_P){

                 const uint8_t *vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_INTER];
                 int mx, my, pred_x, pred_y, dxy;
                 int16_t *motion_ptr;
 
                 motion_ptr= h263_pred_motion(&s->m, 0, 0, &pred_x, &pred_y);
                 if(s->m.mb_type[x + y*s->m.mb_stride]&CANDIDATE_MB_TYPE_INTER){
                     for(i=0; i<6; i++)
                         init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i], 7*32);
 
                     put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
 
                     s->m.pb= s->reorder_pb[5];
                     mx= motion_ptr[0];
                     my= motion_ptr[1];
                     assert(mx>=-32 && mx<=31);
                     assert(my>=-32 && my<=31);
                     assert(pred_x>=-32 && pred_x<=31);
                     assert(pred_y>=-32 && pred_y<=31);
                     ff_h263_encode_motion(&s->m, mx - pred_x, 1);
                     ff_h263_encode_motion(&s->m, my - pred_y, 1);
                     s->reorder_pb[5]= s->m.pb;
                     score[1] += lambda*put_bits_count(&s->reorder_pb[5]);
 
                     dxy= (mx&1) + 2*(my&1);
 
                     s->dsp.put_pixels_tab[0][dxy](temp+16, ref + (mx>>1) + stride*(my>>1), stride, 16);
 
                     score[1]+= encode_block(s, src+16*x, temp+16, decoded, stride, 5, 64, lambda, 0);
                     best= score[1] <= score[0];
 
                     vlc= ff_svq1_block_type_vlc[SVQ1_BLOCK_SKIP];
                     score[2]= s->dsp.sse[0](NULL, src+16*x, ref, stride, 16);
                     score[2]+= vlc[1]*lambda;
                     if(score[2] < score[best] && mx==0 && my==0){
                         best=2;
                         s->dsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
                         for(i=0; i<6; i++){
                             count[2][i]=0;
                         }
                         put_bits(&s->pb, vlc[1], vlc[0]);
                     }
                 }
 
                 if(best==1){
                     for(i=0; i<6; i++){
                         count[1][i]= put_bits_count(&s->reorder_pb[i]);
                         flush_put_bits(&s->reorder_pb[i]);
                     }
                 }else{
                     motion_ptr[0                 ] = motion_ptr[1                 ]=
                     motion_ptr[2                 ] = motion_ptr[3                 ]=
                     motion_ptr[0+2*s->m.b8_stride] = motion_ptr[1+2*s->m.b8_stride]=
                     motion_ptr[2+2*s->m.b8_stride] = motion_ptr[3+2*s->m.b8_stride]=0;
                 }
             }
 
             s->rd_total += score[best];
 
             for(i=5; i>=0; i--){
                 ff_copy_bits(&s->pb, reorder_buffer[best][i], count[best][i]);
             }
             if(best==0){
                 s->dsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
             }
         }
         s->m.first_slice_line=0;
     }
     return 0;
 }
 

 static av_cold int svq1_encode_init(AVCodecContext *avctx)

 {
     SVQ1Context * const s = avctx->priv_data;
 
     dsputil_init(&s->dsp, avctx);
     avctx->coded_frame= (AVFrame*)&s->picture;
 
     s->frame_width = avctx->width;
     s->frame_height = avctx->height;
 
     s->y_block_width = (s->frame_width + 15) / 16;
     s->y_block_height = (s->frame_height + 15) / 16;
 
     s->c_block_width = (s->frame_width / 4 + 15) / 16;
     s->c_block_height = (s->frame_height / 4 + 15) / 16;
 
     s->avctx= avctx;
     s->m.avctx= avctx;

     s->m.me.temp      =

     s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
     s->m.me.map       = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
     s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
     s->mb_type        = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int16_t));
     s->dummy          = av_mallocz((s->y_block_width+1)*s->y_block_height*sizeof(int32_t));
     h263_encode_init(&s->m); //mv_penalty
 
     return 0;
 }
 
 static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
     int buf_size, void *data)
 {
     SVQ1Context * const s = avctx->priv_data;
     AVFrame *pict = data;
     AVFrame * const p= (AVFrame*)&s->picture;
     AVFrame temp;
     int i;
 
     if(avctx->pix_fmt != PIX_FMT_YUV410P){
         av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
         return -1;
     }
 
     if(!s->current_picture.data[0]){
         avctx->get_buffer(avctx, &s->current_picture);
         avctx->get_buffer(avctx, &s->last_picture);

         s->scratchbuf = av_malloc(s->current_picture.linesize[0] * 16 * 2);

     }
 
     temp= s->current_picture;
     s->current_picture= s->last_picture;
     s->last_picture= temp;
 
     init_put_bits(&s->pb, buf, buf_size);
 
     *p = *pict;

     p->pict_type = avctx->gop_size && avctx->frame_number % avctx->gop_size ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
     p->key_frame = p->pict_type == AV_PICTURE_TYPE_I;

 
     svq1_write_header(s, p->pict_type);
     for(i=0; i<3; i++){
         if(svq1_encode_plane(s, i,
             s->picture.data[i], s->last_picture.data[i], s->current_picture.data[i],
             s->frame_width / (i?4:1), s->frame_height / (i?4:1),
             s->picture.linesize[i], s->current_picture.linesize[i]) < 0)
                 return -1;
     }
 
 //    align_put_bits(&s->pb);
     while(put_bits_count(&s->pb) & 31)
         put_bits(&s->pb, 1, 0);
 
     flush_put_bits(&s->pb);
 

     return put_bits_count(&s->pb) / 8;

 }
 

 static av_cold int svq1_encode_end(AVCodecContext *avctx)

 {
     SVQ1Context * const s = avctx->priv_data;
     int i;
 
     av_log(avctx, AV_LOG_DEBUG, "RD: %f\n", s->rd_total/(double)(avctx->width*avctx->height*avctx->frame_number));
 
     av_freep(&s->m.me.scratchpad);
     av_freep(&s->m.me.map);
     av_freep(&s->m.me.score_map);
     av_freep(&s->mb_type);
     av_freep(&s->dummy);

     av_freep(&s->scratchbuf);

 
     for(i=0; i<3; i++){
         av_freep(&s->motion_val8[i]);
         av_freep(&s->motion_val16[i]);
     }
 
     return 0;
 }
 
 

 AVCodec ff_svq1_encoder = {

     "svq1",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_SVQ1,
     sizeof(SVQ1Context),
     svq1_encode_init,
     svq1_encode_frame,
     svq1_encode_end,

     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE},

     .long_name= NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),

 };