/*
  * Copyright (c) 2003 Michael Niedermayer
  *

  * 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
  * ASUS V1/V2 encoder.
  */
 

 #include "libavutil/attributes.h"

 #include "libavutil/mem.h"
 
 #include "asv.h"
 #include "avcodec.h"

 #include "internal.h"

 #include "mathops.h"

 #include "mpeg12data.h"
 
 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){

     put_bits(pb, n, ff_reverse[ v << (8-n) ]);

 }
 
 static inline void asv1_put_level(PutBitContext *pb, int level){
     unsigned int index= level + 3;
 
     if(index <= 6) put_bits(pb, ff_asv_level_tab[index][1], ff_asv_level_tab[index][0]);
     else{
         put_bits(pb, ff_asv_level_tab[3][1], ff_asv_level_tab[3][0]);
         put_sbits(pb, 8, level);
     }
 }
 
 static inline void asv2_put_level(PutBitContext *pb, int level){
     unsigned int index= level + 31;
 
     if(index <= 62) put_bits(pb, ff_asv2_level_tab[index][1], ff_asv2_level_tab[index][0]);
     else{
         put_bits(pb, ff_asv2_level_tab[31][1], ff_asv2_level_tab[31][0]);
         asv2_put_bits(pb, 8, level&0xFF);
     }
 }
 

 static inline void asv1_encode_block(ASV1Context *a, int16_t block[64]){

     int i;
     int nc_count=0;
 
     put_bits(&a->pb, 8, (block[0] + 32)>>6);
     block[0]= 0;
 
     for(i=0; i<10; i++){
         const int index = ff_asv_scantab[4*i];
         int ccp=0;
 
         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
 
         if(ccp){
             for(;nc_count; nc_count--)
                 put_bits(&a->pb, ff_asv_ccp_tab[0][1], ff_asv_ccp_tab[0][0]);
 
             put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);
 
             if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
             if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
             if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
             if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
         }else{
             nc_count++;
         }
     }
     put_bits(&a->pb, ff_asv_ccp_tab[16][1], ff_asv_ccp_tab[16][0]);
 }
 

 static inline void asv2_encode_block(ASV1Context *a, int16_t block[64]){

     int i;
     int count=0;
 
     for(count=63; count>3; count--){
         const int index = ff_asv_scantab[count];
 
         if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
             break;
     }
 
     count >>= 2;
 
     asv2_put_bits(&a->pb, 4, count);
     asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
     block[0]= 0;
 
     for(i=0; i<=count; i++){
         const int index = ff_asv_scantab[4*i];
         int ccp=0;
 
         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
 

         av_assert2(i || ccp<8);

         if(i) put_bits(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
         else  put_bits(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);
 
         if(ccp){
             if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
             if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
             if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
             if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
         }
     }
 }
 
 #define MAX_MB_SIZE (30*16*16*3/2/8)
 

 static inline int encode_mb(ASV1Context *a, int16_t block[6][64]){

     int i;
 
     if (a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < MAX_MB_SIZE) {
         av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
         return -1;
     }
 
     if(a->avctx->codec_id == AV_CODEC_ID_ASV1){
         for(i=0; i<6; i++)
             asv1_encode_block(a, block[i]);
     }else{
         for(i=0; i<6; i++)
             asv2_encode_block(a, block[i]);
     }
     return 0;
 }
 
 static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){

     int16_t (*block)[64]= a->block;

     int linesize= a->picture.linesize[0];
     int i;
 
     uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
     uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
     uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 
     a->dsp.get_pixels(block[0], ptr_y                 , linesize);
     a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
     a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
     a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
     for(i=0; i<4; i++)
         a->dsp.fdct(block[i]);
 
     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
         a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
         a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
         for(i=4; i<6; i++)
             a->dsp.fdct(block[i]);
     }
 }
 
 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                         const AVFrame *pict, int *got_packet)
 {
     ASV1Context * const a = avctx->priv_data;
     AVFrame * const p= &a->picture;
     int size, ret;
     int mb_x, mb_y;
 

     if ((ret = ff_alloc_packet2(avctx, pkt, a->mb_height*a->mb_width*MAX_MB_SIZE +
                                   FF_MIN_BUFFER_SIZE)) < 0)

         return ret;
 
     init_put_bits(&a->pb, pkt->data, pkt->size);
 
     *p = *pict;
     p->pict_type= AV_PICTURE_TYPE_I;
     p->key_frame= 1;
 
     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
 
     if(a->mb_width2 != a->mb_width){
         mb_x= a->mb_width2;
         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
 
     if(a->mb_height2 != a->mb_height){
         mb_y= a->mb_height2;
         for(mb_x=0; mb_x<a->mb_width; mb_x++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
     emms_c();
 
     avpriv_align_put_bits(&a->pb);
     while(put_bits_count(&a->pb)&31)
         put_bits(&a->pb, 8, 0);
 
     size= put_bits_count(&a->pb)/32;
 
     if(avctx->codec_id == AV_CODEC_ID_ASV1)
         a->dsp.bswap_buf((uint32_t*)pkt->data, (uint32_t*)pkt->data, size);
     else{
         int i;
         for(i=0; i<4*size; i++)

             pkt->data[i] = ff_reverse[pkt->data[i]];

     }
 
     pkt->size   = size*4;
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
 
     return 0;
 }
 
 static av_cold int encode_init(AVCodecContext *avctx){
     ASV1Context * const a = avctx->priv_data;
     int i;
     const int scale= avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
 
     ff_asv_common_init(avctx);
 
     if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
 
     a->inv_qscale= (32*scale*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
 
     avctx->extradata= av_mallocz(8);
     avctx->extradata_size=8;
     ((uint32_t*)avctx->extradata)[0]= av_le2ne32(a->inv_qscale);
     ((uint32_t*)avctx->extradata)[1]= av_le2ne32(AV_RL32("ASUS"));
 
     for(i=0; i<64; i++){
         int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
         a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
     }
 
     return 0;
 }
 
 #if CONFIG_ASV1_ENCODER
 AVCodec ff_asv1_encoder = {
     .name           = "asv1",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_ASV1,
     .priv_data_size = sizeof(ASV1Context),
     .init           = encode_init,
     .encode2        = encode_frame,

     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
                                                     AV_PIX_FMT_NONE },

     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),
 };
 #endif
 
 #if CONFIG_ASV2_ENCODER
 AVCodec ff_asv2_encoder = {
     .name           = "asv2",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_ASV2,
     .priv_data_size = sizeof(ASV1Context),
     .init           = encode_init,
     .encode2        = encode_frame,

     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P,
                                                     AV_PIX_FMT_NONE },

     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),
 };
 #endif