/*
  * VC3/DNxHD encoder
  * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  * Copyright (c) 2011 MirriAd Ltd

  *
  * VC-3 encoder funded by the British Broadcasting Corporation

  * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>

  *
  * 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
  */
 
 //#define DEBUG
 #define RC_VARIANCE 1 // use variance or ssd for fast rc
 

 #include "libavutil/opt.h"

 #include "avcodec.h"
 #include "dsputil.h"

 #include "internal.h"

 #include "mpegvideo.h"

 #include "mpegvideo_common.h"

 #include "dnxhdenc.h"

 #include "internal.h"

 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

 #define DNX10BIT_QMAT_SHIFT 18 // The largest value that will not lead to overflow for 10bit samples.

 
 static const AVOption options[]={

     {"nitris_compat", "encode with Avid Nitris compatibility", offsetof(DNXHDEncContext, nitris_compat), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, VE},

 {NULL}
 };
 static const AVClass class = { "dnxhd", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
 

 #define LAMBDA_FRAC_BITS 10
 

 static void dnxhd_8bit_get_pixels_8x4_sym(DCTELEM *restrict block, const uint8_t *pixels, int line_size)

 {
     int i;
     for (i = 0; i < 4; i++) {
         block[0] = pixels[0]; block[1] = pixels[1];
         block[2] = pixels[2]; block[3] = pixels[3];
         block[4] = pixels[4]; block[5] = pixels[5];
         block[6] = pixels[6]; block[7] = pixels[7];
         pixels += line_size;
         block += 8;
     }

     memcpy(block,      block -  8, sizeof(*block) * 8);
     memcpy(block +  8, block - 16, sizeof(*block) * 8);
     memcpy(block + 16, block - 24, sizeof(*block) * 8);
     memcpy(block + 24, block - 32, sizeof(*block) * 8);

 }
 

 static av_always_inline void dnxhd_10bit_get_pixels_8x4_sym(DCTELEM *restrict block, const uint8_t *pixels, int line_size)
 {
     int i;
 
     block += 32;
 
     for (i = 0; i < 4; i++) {
         memcpy(block + i     * 8, pixels + i * line_size, 8 * sizeof(*block));
         memcpy(block - (i+1) * 8, pixels + i * line_size, 8 * sizeof(*block));
     }
 }
 
 static int dnxhd_10bit_dct_quantize(MpegEncContext *ctx, DCTELEM *block,
                                     int n, int qscale, int *overflow)
 {
     const uint8_t *scantable= ctx->intra_scantable.scantable;

     const int *qmat = n<4 ? ctx->q_intra_matrix[qscale] : ctx->q_chroma_intra_matrix[qscale];

     int last_non_zero = 0;

     int i;

 
     ctx->dsp.fdct(block);
 
     // Divide by 4 with rounding, to compensate scaling of DCT coefficients
     block[0] = (block[0] + 2) >> 2;
 

     for (i = 1; i < 64; ++i) {

         int j = scantable[i];
         int sign = block[j] >> 31;
         int level = (block[j] ^ sign) - sign;
         level = level * qmat[j] >> DNX10BIT_QMAT_SHIFT;
         block[j] = (level ^ sign) - sign;
         if (level)
             last_non_zero = i;
     }
 
     return last_non_zero;
 }
 

 static int dnxhd_init_vlc(DNXHDEncContext *ctx)
 {

     int i, j, level, run;
     int max_level = 1<<(ctx->cid_table->bit_depth+2);
 

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->vlc_codes, max_level*4*sizeof(*ctx->vlc_codes), fail);

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->vlc_bits,  max_level*4*sizeof(*ctx->vlc_bits) , fail);
     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->run_codes, 63*2,                                fail);
     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->run_bits,  63,                                  fail);

     ctx->vlc_codes += max_level*2;
     ctx->vlc_bits  += max_level*2;

     for (level = -max_level; level < max_level; level++) {
         for (run = 0; run < 2; run++) {
             int index = (level<<1)|run;
             int sign, offset = 0, alevel = level;
 
             MASK_ABS(sign, alevel);
             if (alevel > 64) {
                 offset = (alevel-1)>>6;
                 alevel -= offset<<6;
             }
             for (j = 0; j < 257; j++) {

                 if (ctx->cid_table->ac_level[j] >> 1 == alevel &&

                     (!offset || (ctx->cid_table->ac_flags[j] & 1) && offset) &&
                     (!run    || (ctx->cid_table->ac_flags[j] & 2) && run)) {

                     assert(!ctx->vlc_codes[index]);

                     if (alevel) {

                         ctx->vlc_codes[index] = (ctx->cid_table->ac_codes[j]<<1)|(sign&1);
                         ctx->vlc_bits [index] = ctx->cid_table->ac_bits[j]+1;

                     } else {

                         ctx->vlc_codes[index] = ctx->cid_table->ac_codes[j];
                         ctx->vlc_bits [index] = ctx->cid_table->ac_bits [j];

                     }
                     break;
                 }
             }
             assert(!alevel || j < 257);
             if (offset) {

                 ctx->vlc_codes[index] = (ctx->vlc_codes[index]<<ctx->cid_table->index_bits)|offset;
                 ctx->vlc_bits [index]+= ctx->cid_table->index_bits;

             }
         }

     }
     for (i = 0; i < 62; i++) {
         int run = ctx->cid_table->run[i];
         assert(run < 63);

         ctx->run_codes[run] = ctx->cid_table->run_codes[i];
         ctx->run_bits [run] = ctx->cid_table->run_bits[i];

     }
     return 0;
  fail:
     return -1;
 }
 
 static int dnxhd_init_qmat(DNXHDEncContext *ctx, int lbias, int cbias)
 {
     // init first elem to 1 to avoid div by 0 in convert_matrix
     uint16_t weight_matrix[64] = {1,}; // convert_matrix needs uint16_t*
     int qscale, i;

     const uint8_t *luma_weight_table   = ctx->cid_table->luma_weight;
     const uint8_t *chroma_weight_table = ctx->cid_table->chroma_weight;

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->qmatrix_l,   (ctx->m.avctx->qmax+1) * 64 *     sizeof(int),      fail);
     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->qmatrix_c,   (ctx->m.avctx->qmax+1) * 64 *     sizeof(int),      fail);

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->qmatrix_l16, (ctx->m.avctx->qmax+1) * 64 * 2 * sizeof(uint16_t), fail);
     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->qmatrix_c16, (ctx->m.avctx->qmax+1) * 64 * 2 * sizeof(uint16_t), fail);

     if (ctx->cid_table->bit_depth == 8) {
         for (i = 1; i < 64; i++) {
             int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];
             weight_matrix[j] = ctx->cid_table->luma_weight[i];
         }
         ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_l, ctx->qmatrix_l16, weight_matrix,
                           ctx->m.intra_quant_bias, 1, ctx->m.avctx->qmax, 1);
         for (i = 1; i < 64; i++) {
             int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];
             weight_matrix[j] = ctx->cid_table->chroma_weight[i];
         }
         ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_c, ctx->qmatrix_c16, weight_matrix,
                           ctx->m.intra_quant_bias, 1, ctx->m.avctx->qmax, 1);
 
         for (qscale = 1; qscale <= ctx->m.avctx->qmax; qscale++) {
             for (i = 0; i < 64; i++) {
                 ctx->qmatrix_l  [qscale]   [i] <<= 2; ctx->qmatrix_c  [qscale]   [i] <<= 2;
                 ctx->qmatrix_l16[qscale][0][i] <<= 2; ctx->qmatrix_l16[qscale][1][i] <<= 2;
                 ctx->qmatrix_c16[qscale][0][i] <<= 2; ctx->qmatrix_c16[qscale][1][i] <<= 2;
             }
         }
     } else {
         // 10-bit
         for (qscale = 1; qscale <= ctx->m.avctx->qmax; qscale++) {
             for (i = 1; i < 64; i++) {
                 int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];
 
                 // The quantization formula from the VC-3 standard is:
                 // quantized = sign(block[i]) * floor(abs(block[i]/s) * p / (qscale * weight_table[i]))
                 // Where p is 32 for 8-bit samples and 8 for 10-bit ones.
                 // The s factor compensates scaling of DCT coefficients done by the DCT routines,
                 // and therefore is not present in standard.  It's 8 for 8-bit samples and 4 for 10-bit ones.
                 // We want values of ctx->qtmatrix_l and ctx->qtmatrix_r to be:
                 // ((1 << DNX10BIT_QMAT_SHIFT) * (p / s)) / (qscale * weight_table[i])
                 // For 10-bit samples, p / s == 2
                 ctx->qmatrix_l[qscale][j] = (1 << (DNX10BIT_QMAT_SHIFT + 1)) / (qscale * luma_weight_table[i]);
                 ctx->qmatrix_c[qscale][j] = (1 << (DNX10BIT_QMAT_SHIFT + 1)) / (qscale * chroma_weight_table[i]);
             }

         }
     }

     ctx->m.q_chroma_intra_matrix16 = ctx->qmatrix_c16;
     ctx->m.q_chroma_intra_matrix   = ctx->qmatrix_c;
     ctx->m.q_intra_matrix16        = ctx->qmatrix_l16;
     ctx->m.q_intra_matrix          = ctx->qmatrix_l;
 

     return 0;
  fail:
     return -1;
 }
 
 static int dnxhd_init_rc(DNXHDEncContext *ctx)
 {

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_rc, 8160*ctx->m.avctx->qmax*sizeof(RCEntry), fail);

     if (ctx->m.avctx->mb_decision != FF_MB_DECISION_RD)

         FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_cmp, ctx->m.mb_num*sizeof(RCCMPEntry), fail);

     ctx->frame_bits = (ctx->cid_table->coding_unit_size - 640 - 4 - ctx->min_padding) * 8;

     ctx->qscale = 1;
     ctx->lambda = 2<<LAMBDA_FRAC_BITS; // qscale 2
     return 0;
  fail:
     return -1;
 }
 
 static int dnxhd_encode_init(AVCodecContext *avctx)
 {
     DNXHDEncContext *ctx = avctx->priv_data;

     int i, index, bit_depth;
 
     switch (avctx->pix_fmt) {
     case PIX_FMT_YUV422P:
         bit_depth = 8;
         break;
     case PIX_FMT_YUV422P10:
         bit_depth = 10;
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "pixel format is incompatible with DNxHD\n");
         return -1;
     }

     ctx->cid = ff_dnxhd_find_cid(avctx, bit_depth);
     if (!ctx->cid) {

         av_log(avctx, AV_LOG_ERROR, "video parameters incompatible with DNxHD\n");
         return -1;
     }

     av_log(avctx, AV_LOG_DEBUG, "cid %d\n", ctx->cid);

 
     index = ff_dnxhd_get_cid_table(ctx->cid);
     ctx->cid_table = &ff_dnxhd_cid_table[index];
 
     ctx->m.avctx = avctx;
     ctx->m.mb_intra = 1;
     ctx->m.h263_aic = 1;
 

     avctx->bits_per_raw_sample = ctx->cid_table->bit_depth;

     ff_dsputil_init(&ctx->m.dsp, avctx);

     ff_dct_common_init(&ctx->m);

     if (!ctx->m.dct_quantize)

         ctx->m.dct_quantize = ff_dct_quantize_c;

 
     if (ctx->cid_table->bit_depth == 10) {
        ctx->m.dct_quantize = dnxhd_10bit_dct_quantize;
        ctx->get_pixels_8x4_sym = dnxhd_10bit_get_pixels_8x4_sym;
        ctx->block_width_l2 = 4;
     } else {
        ctx->get_pixels_8x4_sym = dnxhd_8bit_get_pixels_8x4_sym;
        ctx->block_width_l2 = 3;
     }
 

 #if HAVE_MMX

     ff_dnxhd_init_mmx(ctx);
 #endif

 
     ctx->m.mb_height = (avctx->height + 15) / 16;
     ctx->m.mb_width  = (avctx->width  + 15) / 16;
 
     if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
         ctx->interlaced = 1;
         ctx->m.mb_height /= 2;
     }
 
     ctx->m.mb_num = ctx->m.mb_height * ctx->m.mb_width;
 
     if (avctx->intra_quant_bias != FF_DEFAULT_QUANT_BIAS)
         ctx->m.intra_quant_bias = avctx->intra_quant_bias;
     if (dnxhd_init_qmat(ctx, ctx->m.intra_quant_bias, 0) < 0) // XXX tune lbias/cbias
         return -1;
 

     // Avid Nitris hardware decoder requires a minimum amount of padding in the coding unit payload
     if (ctx->nitris_compat)
         ctx->min_padding = 1600;
 

     if (dnxhd_init_vlc(ctx) < 0)
         return -1;
     if (dnxhd_init_rc(ctx) < 0)
         return -1;
 

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->slice_size, ctx->m.mb_height*sizeof(uint32_t), fail);

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->slice_offs, ctx->m.mb_height*sizeof(uint32_t), fail);

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_bits,    ctx->m.mb_num   *sizeof(uint16_t), fail);

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_qscale,  ctx->m.mb_num   *sizeof(uint8_t),  fail);

 
     ctx->frame.key_frame = 1;

     ctx->frame.pict_type = AV_PICTURE_TYPE_I;

     ctx->m.avctx->coded_frame = &ctx->frame;
 

     if (avctx->thread_count > MAX_THREADS) {

         av_log(avctx, AV_LOG_ERROR, "too many threads\n");
         return -1;
     }
 
     ctx->thread[0] = ctx;
     for (i = 1; i < avctx->thread_count; i++) {
         ctx->thread[i] =  av_malloc(sizeof(DNXHDEncContext));
         memcpy(ctx->thread[i], ctx, sizeof(DNXHDEncContext));
     }
 
     return 0;

  fail: //for FF_ALLOCZ_OR_GOTO

     return -1;
 }
 
 static int dnxhd_write_header(AVCodecContext *avctx, uint8_t *buf)
 {
     DNXHDEncContext *ctx = avctx->priv_data;
     const uint8_t header_prefix[5] = { 0x00,0x00,0x02,0x80,0x01 };
 

     memset(buf, 0, 640);
 

     memcpy(buf, header_prefix, 5);
     buf[5] = ctx->interlaced ? ctx->cur_field+2 : 0x01;
     buf[6] = 0x80; // crc flag off
     buf[7] = 0xa0; // reserved

     AV_WB16(buf + 0x18, avctx->height>>ctx->interlaced); // ALPF

     AV_WB16(buf + 0x1a, avctx->width);  // SPL

     AV_WB16(buf + 0x1d, avctx->height>>ctx->interlaced); // NAL

     buf[0x21] = ctx->cid_table->bit_depth == 10 ? 0x58 : 0x38;

     buf[0x22] = 0x88 + (ctx->interlaced<<2);

     AV_WB32(buf + 0x28, ctx->cid); // CID
     buf[0x2c] = ctx->interlaced ? 0 : 0x80;
 
     buf[0x5f] = 0x01; // UDL
 
     buf[0x167] = 0x02; // reserved
     AV_WB16(buf + 0x16a, ctx->m.mb_height * 4 + 4); // MSIPS
     buf[0x16d] = ctx->m.mb_height; // Ns
     buf[0x16f] = 0x10; // reserved
 
     ctx->msip = buf + 0x170;
     return 0;
 }
 
 static av_always_inline void dnxhd_encode_dc(DNXHDEncContext *ctx, int diff)
 {
     int nbits;
     if (diff < 0) {
         nbits = av_log2_16bit(-2*diff);
         diff--;
     } else {
         nbits = av_log2_16bit(2*diff);
     }
     put_bits(&ctx->m.pb, ctx->cid_table->dc_bits[nbits] + nbits,
              (ctx->cid_table->dc_codes[nbits]<<nbits) + (diff & ((1 << nbits) - 1)));
 }
 
 static av_always_inline void dnxhd_encode_block(DNXHDEncContext *ctx, DCTELEM *block, int last_index, int n)
 {
     int last_non_zero = 0;
     int slevel, i, j;
 
     dnxhd_encode_dc(ctx, block[0] - ctx->m.last_dc[n]);
     ctx->m.last_dc[n] = block[0];
 
     for (i = 1; i <= last_index; i++) {
         j = ctx->m.intra_scantable.permutated[i];
         slevel = block[j];
         if (slevel) {
             int run_level = i - last_non_zero - 1;

             int rlevel = (slevel<<1)|!!run_level;

             put_bits(&ctx->m.pb, ctx->vlc_bits[rlevel], ctx->vlc_codes[rlevel]);

             if (run_level)

                 put_bits(&ctx->m.pb, ctx->run_bits[run_level], ctx->run_codes[run_level]);

             last_non_zero = i;
         }
     }

     put_bits(&ctx->m.pb, ctx->vlc_bits[0], ctx->vlc_codes[0]); // EOB

 }
 
 static av_always_inline void dnxhd_unquantize_c(DNXHDEncContext *ctx, DCTELEM *block, int n, int qscale, int last_index)
 {

     const uint8_t *weight_matrix;

     int level;
     int i;
 

     weight_matrix = (n&2) ? ctx->cid_table->chroma_weight : ctx->cid_table->luma_weight;

 
     for (i = 1; i <= last_index; i++) {
         int j = ctx->m.intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             if (level < 0) {

                 level = (1-2*level) * qscale * weight_matrix[i];

                 if (ctx->cid_table->bit_depth == 10) {
                     if (weight_matrix[i] != 8)
                         level += 8;
                     level >>= 4;
                 } else {
                     if (weight_matrix[i] != 32)
                         level += 32;
                     level >>= 6;
                 }

                 level = -level;
             } else {

                 level = (2*level+1) * qscale * weight_matrix[i];

                 if (ctx->cid_table->bit_depth == 10) {
                     if (weight_matrix[i] != 8)
                         level += 8;
                     level >>= 4;
                 } else {
                     if (weight_matrix[i] != 32)
                         level += 32;
                     level >>= 6;
                 }

             }
             block[j] = level;
         }
     }
 }
 
 static av_always_inline int dnxhd_ssd_block(DCTELEM *qblock, DCTELEM *block)
 {
     int score = 0;
     int i;
     for (i = 0; i < 64; i++)

         score += (block[i] - qblock[i]) * (block[i] - qblock[i]);

     return score;
 }
 
 static av_always_inline int dnxhd_calc_ac_bits(DNXHDEncContext *ctx, DCTELEM *block, int last_index)
 {
     int last_non_zero = 0;
     int bits = 0;
     int i, j, level;
     for (i = 1; i <= last_index; i++) {
         j = ctx->m.intra_scantable.permutated[i];
         level = block[j];
         if (level) {
             int run_level = i - last_non_zero - 1;

             bits += ctx->vlc_bits[(level<<1)|!!run_level]+ctx->run_bits[run_level];

             last_non_zero = i;
         }
     }
     return bits;
 }
 
 static av_always_inline void dnxhd_get_blocks(DNXHDEncContext *ctx, int mb_x, int mb_y)
 {

     const int bs = ctx->block_width_l2;
     const int bw = 1 << bs;
     const uint8_t *ptr_y = ctx->thread[0]->src[0] + ((mb_y << 4) * ctx->m.linesize)   + (mb_x << bs+1);
     const uint8_t *ptr_u = ctx->thread[0]->src[1] + ((mb_y << 4) * ctx->m.uvlinesize) + (mb_x << bs);
     const uint8_t *ptr_v = ctx->thread[0]->src[2] + ((mb_y << 4) * ctx->m.uvlinesize) + (mb_x << bs);

     DSPContext *dsp = &ctx->m.dsp;
 

     dsp->get_pixels(ctx->blocks[0], ptr_y,      ctx->m.linesize);
     dsp->get_pixels(ctx->blocks[1], ptr_y + bw, ctx->m.linesize);
     dsp->get_pixels(ctx->blocks[2], ptr_u,      ctx->m.uvlinesize);
     dsp->get_pixels(ctx->blocks[3], ptr_v,      ctx->m.uvlinesize);

     if (mb_y+1 == ctx->m.mb_height && ctx->m.avctx->height == 1080) {

         if (ctx->interlaced) {

             ctx->get_pixels_8x4_sym(ctx->blocks[4], ptr_y + ctx->dct_y_offset,      ctx->m.linesize);
             ctx->get_pixels_8x4_sym(ctx->blocks[5], ptr_y + ctx->dct_y_offset + bw, ctx->m.linesize);
             ctx->get_pixels_8x4_sym(ctx->blocks[6], ptr_u + ctx->dct_uv_offset,     ctx->m.uvlinesize);
             ctx->get_pixels_8x4_sym(ctx->blocks[7], ptr_v + ctx->dct_uv_offset,     ctx->m.uvlinesize);

         } else {

             dsp->clear_block(ctx->blocks[4]);
             dsp->clear_block(ctx->blocks[5]);
             dsp->clear_block(ctx->blocks[6]);
             dsp->clear_block(ctx->blocks[7]);

         }

     } else {

         dsp->get_pixels(ctx->blocks[4], ptr_y + ctx->dct_y_offset,      ctx->m.linesize);
         dsp->get_pixels(ctx->blocks[5], ptr_y + ctx->dct_y_offset + bw, ctx->m.linesize);
         dsp->get_pixels(ctx->blocks[6], ptr_u + ctx->dct_uv_offset,     ctx->m.uvlinesize);
         dsp->get_pixels(ctx->blocks[7], ptr_v + ctx->dct_uv_offset,     ctx->m.uvlinesize);

     }
 }
 
 static av_always_inline int dnxhd_switch_matrix(DNXHDEncContext *ctx, int i)
 {

     const static uint8_t component[8]={0,0,1,2,0,0,1,2};

     return component[i];

 }
 

 static int dnxhd_calc_bits_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)

 {

     DNXHDEncContext *ctx = avctx->priv_data;
     int mb_y = jobnr, mb_x;
     int qscale = ctx->qscale;

     LOCAL_ALIGNED_16(DCTELEM, block, [64]);

     ctx = ctx->thread[threadnr];

     ctx->m.last_dc[0] =
     ctx->m.last_dc[1] =

     ctx->m.last_dc[2] = 1 << (ctx->cid_table->bit_depth + 2);

 
     for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {
         unsigned mb = mb_y * ctx->m.mb_width + mb_x;
         int ssd     = 0;
         int ac_bits = 0;
         int dc_bits = 0;
         int i;
 
         dnxhd_get_blocks(ctx, mb_x, mb_y);
 
         for (i = 0; i < 8; i++) {
             DCTELEM *src_block = ctx->blocks[i];
             int overflow, nbits, diff, last_index;
             int n = dnxhd_switch_matrix(ctx, i);
 

             memcpy(block, src_block, 64*sizeof(*block));

             last_index = ctx->m.dct_quantize(&ctx->m, block, 4&(2*i), qscale, &overflow);

             ac_bits += dnxhd_calc_ac_bits(ctx, block, last_index);
 
             diff = block[0] - ctx->m.last_dc[n];
             if (diff < 0) nbits = av_log2_16bit(-2*diff);
             else          nbits = av_log2_16bit( 2*diff);

 
             assert(nbits < ctx->cid_table->bit_depth + 4);

             dc_bits += ctx->cid_table->dc_bits[nbits] + nbits;
 
             ctx->m.last_dc[n] = block[0];
 
             if (avctx->mb_decision == FF_MB_DECISION_RD || !RC_VARIANCE) {
                 dnxhd_unquantize_c(ctx, block, i, qscale, last_index);
                 ctx->m.dsp.idct(block);
                 ssd += dnxhd_ssd_block(block, src_block);

             }
         }

         ctx->mb_rc[qscale][mb].ssd = ssd;
         ctx->mb_rc[qscale][mb].bits = ac_bits+dc_bits+12+8*ctx->vlc_bits[0];
     }

     return 0;
 }
 

 static int dnxhd_encode_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)

 {

     DNXHDEncContext *ctx = avctx->priv_data;
     int mb_y = jobnr, mb_x;
     ctx = ctx->thread[threadnr];
     init_put_bits(&ctx->m.pb, (uint8_t *)arg + 640 + ctx->slice_offs[jobnr], ctx->slice_size[jobnr]);

     ctx->m.last_dc[0] =
     ctx->m.last_dc[1] =

     ctx->m.last_dc[2] = 1 << (ctx->cid_table->bit_depth + 2);

     for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {
         unsigned mb = mb_y * ctx->m.mb_width + mb_x;
         int qscale = ctx->mb_qscale[mb];
         int i;
 
         put_bits(&ctx->m.pb, 12, qscale<<1);
 
         dnxhd_get_blocks(ctx, mb_x, mb_y);
 
         for (i = 0; i < 8; i++) {
             DCTELEM *block = ctx->blocks[i];

             int overflow, n = dnxhd_switch_matrix(ctx, i);

             int last_index = ctx->m.dct_quantize(&ctx->m, block, 4&(2*i), qscale, &overflow);

             //START_TIMER;
             dnxhd_encode_block(ctx, block, last_index, n);
             //STOP_TIMER("encode_block");

         }

     }
     if (put_bits_count(&ctx->m.pb)&31)
         put_bits(&ctx->m.pb, 32-(put_bits_count(&ctx->m.pb)&31), 0);

     flush_put_bits(&ctx->m.pb);
     return 0;
 }
 

 static void dnxhd_setup_threads_slices(DNXHDEncContext *ctx)

 {
     int mb_y, mb_x;

     int offset = 0;
     for (mb_y = 0; mb_y < ctx->m.mb_height; mb_y++) {
         int thread_size;
         ctx->slice_offs[mb_y] = offset;

         ctx->slice_size[mb_y] = 0;
         for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {
             unsigned mb = mb_y * ctx->m.mb_width + mb_x;
             ctx->slice_size[mb_y] += ctx->mb_bits[mb];
         }
         ctx->slice_size[mb_y] = (ctx->slice_size[mb_y]+31)&~31;
         ctx->slice_size[mb_y] >>= 3;
         thread_size = ctx->slice_size[mb_y];

         offset += thread_size;
     }
 }
 

 static int dnxhd_mb_var_thread(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)

 {

     DNXHDEncContext *ctx = avctx->priv_data;
     int mb_y = jobnr, mb_x;
     ctx = ctx->thread[threadnr];

     if (ctx->cid_table->bit_depth == 8) {
         uint8_t *pix = ctx->thread[0]->src[0] + ((mb_y<<4) * ctx->m.linesize);
         for (mb_x = 0; mb_x < ctx->m.mb_width; ++mb_x, pix += 16) {
             unsigned mb  = mb_y * ctx->m.mb_width + mb_x;
             int sum = ctx->m.dsp.pix_sum(pix, ctx->m.linesize);

             int varc = (ctx->m.dsp.pix_norm1(pix, ctx->m.linesize) - (((unsigned)sum*sum)>>8)+128)>>8;

             ctx->mb_cmp[mb].value = varc;
             ctx->mb_cmp[mb].mb = mb;
         }
     } else { // 10-bit
         int const linesize = ctx->m.linesize >> 1;
         for (mb_x = 0; mb_x < ctx->m.mb_width; ++mb_x) {
             uint16_t *pix = (uint16_t*)ctx->thread[0]->src[0] + ((mb_y << 4) * linesize) + (mb_x << 4);
             unsigned mb  = mb_y * ctx->m.mb_width + mb_x;
             int sum = 0;
             int sqsum = 0;
             int mean, sqmean;

             int i, j;

             // Macroblocks are 16x16 pixels, unlike DCT blocks which are 8x8.

             for (i = 0; i < 16; ++i) {
                 for (j = 0; j < 16; ++j) {

                     // Turn 16-bit pixels into 10-bit ones.
                     int const sample = (unsigned)pix[j] >> 6;
                     sum += sample;
                     sqsum += sample * sample;
                     // 2^10 * 2^10 * 16 * 16 = 2^28, which is less than INT_MAX
                 }
                 pix += linesize;
             }
             mean = sum >> 8; // 16*16 == 2^8
             sqmean = sqsum >> 8;
             ctx->mb_cmp[mb].value = sqmean - mean * mean;
             ctx->mb_cmp[mb].mb = mb;
         }

     }

     return 0;
 }
 
 static int dnxhd_encode_rdo(AVCodecContext *avctx, DNXHDEncContext *ctx)
 {

     int lambda, up_step, down_step;
     int last_lower = INT_MAX, last_higher = 0;

     int x, y, q;
 
     for (q = 1; q < avctx->qmax; q++) {
         ctx->qscale = q;

         avctx->execute2(avctx, dnxhd_calc_bits_thread, NULL, NULL, ctx->m.mb_height);

     }

     up_step = down_step = 2<<LAMBDA_FRAC_BITS;

     lambda = ctx->lambda;
 
     for (;;) {
         int bits = 0;
         int end = 0;

         if (lambda == last_higher) {

             lambda++;

             end = 1; // need to set final qscales/bits

         }
         for (y = 0; y < ctx->m.mb_height; y++) {
             for (x = 0; x < ctx->m.mb_width; x++) {
                 unsigned min = UINT_MAX;
                 int qscale = 1;
                 int mb = y*ctx->m.mb_width+x;
                 for (q = 1; q < avctx->qmax; q++) {

                     unsigned score = ctx->mb_rc[q][mb].bits*lambda+
                         ((unsigned)ctx->mb_rc[q][mb].ssd<<LAMBDA_FRAC_BITS);

                     if (score < min) {
                         min = score;
                         qscale = q;
                     }
                 }
                 bits += ctx->mb_rc[qscale][mb].bits;
                 ctx->mb_qscale[mb] = qscale;
                 ctx->mb_bits[mb] = ctx->mb_rc[qscale][mb].bits;
             }
             bits = (bits+31)&~31; // padding
             if (bits > ctx->frame_bits)
                 break;
         }

         //av_dlog(ctx->m.avctx, "lambda %d, up %u, down %u, bits %d, frame %d\n",

         //        lambda, last_higher, last_lower, bits, ctx->frame_bits);

         if (end) {
             if (bits > ctx->frame_bits)
                 return -1;
             break;
         }
         if (bits < ctx->frame_bits) {

             last_lower = FFMIN(lambda, last_lower);
             if (last_higher != 0)
                 lambda = (lambda+last_higher)>>1;
             else
                 lambda -= down_step;

             down_step = FFMIN((int64_t)down_step*5, INT_MAX);

             up_step = 1<<LAMBDA_FRAC_BITS;
             lambda = FFMAX(1, lambda);
             if (lambda == last_lower)
                 break;

         } else {

             last_higher = FFMAX(lambda, last_higher);
             if (last_lower != INT_MAX)
                 lambda = (lambda+last_lower)>>1;

             else if ((int64_t)lambda + up_step > INT_MAX)
                 return -1;

             else
                 lambda += up_step;

             up_step = FFMIN((int64_t)up_step*5, INT_MAX);

             down_step = 1<<LAMBDA_FRAC_BITS;

         }
     }

     //av_dlog(ctx->m.avctx, "out lambda %d\n", lambda);

     ctx->lambda = lambda;
     return 0;
 }
 
 static int dnxhd_find_qscale(DNXHDEncContext *ctx)
 {
     int bits = 0;
     int up_step = 1;
     int down_step = 1;
     int last_higher = 0;
     int last_lower = INT_MAX;
     int qscale;
     int x, y;
 
     qscale = ctx->qscale;
     for (;;) {
         bits = 0;
         ctx->qscale = qscale;
         // XXX avoid recalculating bits

         ctx->m.avctx->execute2(ctx->m.avctx, dnxhd_calc_bits_thread, NULL, NULL, ctx->m.mb_height);

         for (y = 0; y < ctx->m.mb_height; y++) {
             for (x = 0; x < ctx->m.mb_width; x++)
                 bits += ctx->mb_rc[qscale][y*ctx->m.mb_width+x].bits;
             bits = (bits+31)&~31; // padding
             if (bits > ctx->frame_bits)
                 break;
         }

         //av_dlog(ctx->m.avctx, "%d, qscale %d, bits %d, frame %d, higher %d, lower %d\n",

         //        ctx->m.avctx->frame_number, qscale, bits, ctx->frame_bits, last_higher, last_lower);
         if (bits < ctx->frame_bits) {
             if (qscale == 1)

                 return 1;

             if (last_higher == qscale - 1) {
                 qscale = last_higher;
                 break;
             }
             last_lower = FFMIN(qscale, last_lower);
             if (last_higher != 0)
                 qscale = (qscale+last_higher)>>1;
             else
                 qscale -= down_step++;
             if (qscale < 1)
                 qscale = 1;
             up_step = 1;
         } else {
             if (last_lower == qscale + 1)
                 break;
             last_higher = FFMAX(qscale, last_higher);
             if (last_lower != INT_MAX)
                 qscale = (qscale+last_lower)>>1;
             else
                 qscale += up_step++;
             down_step = 1;
             if (qscale >= ctx->m.avctx->qmax)
                 return -1;
         }
     }

     //av_dlog(ctx->m.avctx, "out qscale %d\n", qscale);

     ctx->qscale = qscale;
     return 0;
 }
 

 #define BUCKET_BITS 8
 #define RADIX_PASSES 4
 #define NBUCKETS (1 << BUCKET_BITS)
 
 static inline int get_bucket(int value, int shift)
 {
     value >>= shift;
     value &= NBUCKETS - 1;
     return NBUCKETS - 1 - value;
 }
 
 static void radix_count(const RCCMPEntry *data, int size, int buckets[RADIX_PASSES][NBUCKETS])
 {
     int i, j;
     memset(buckets, 0, sizeof(buckets[0][0]) * RADIX_PASSES * NBUCKETS);
     for (i = 0; i < size; i++) {
         int v = data[i].value;
         for (j = 0; j < RADIX_PASSES; j++) {
             buckets[j][get_bucket(v, 0)]++;
             v >>= BUCKET_BITS;
         }
         assert(!v);
     }
     for (j = 0; j < RADIX_PASSES; j++) {
         int offset = size;
         for (i = NBUCKETS - 1; i >= 0; i--)
             buckets[j][i] = offset -= buckets[j][i];
         assert(!buckets[j][0]);
     }
 }
 
 static void radix_sort_pass(RCCMPEntry *dst, const RCCMPEntry *data, int size, int buckets[NBUCKETS], int pass)
 {
     int shift = pass * BUCKET_BITS;
     int i;
     for (i = 0; i < size; i++) {
         int v = get_bucket(data[i].value, shift);
         int pos = buckets[v]++;
         dst[pos] = data[i];
     }
 }
 
 static void radix_sort(RCCMPEntry *data, int size)

 {

     int buckets[RADIX_PASSES][NBUCKETS];
     RCCMPEntry *tmp = av_malloc(sizeof(*tmp) * size);
     radix_count(data, size, buckets);
     radix_sort_pass(tmp, data, size, buckets[0], 0);
     radix_sort_pass(data, tmp, size, buckets[1], 1);
     if (buckets[2][NBUCKETS - 1] || buckets[3][NBUCKETS - 1]) {
         radix_sort_pass(tmp, data, size, buckets[2], 2);
         radix_sort_pass(data, tmp, size, buckets[3], 3);
     }
     av_free(tmp);

 }
 

 static int dnxhd_encode_fast(AVCodecContext *avctx, DNXHDEncContext *ctx)

 {
     int max_bits = 0;

     int ret, x, y;
     if ((ret = dnxhd_find_qscale(ctx)) < 0)

         return -1;
     for (y = 0; y < ctx->m.mb_height; y++) {
         for (x = 0; x < ctx->m.mb_width; x++) {
             int mb = y*ctx->m.mb_width+x;
             int delta_bits;
             ctx->mb_qscale[mb] = ctx->qscale;
             ctx->mb_bits[mb] = ctx->mb_rc[ctx->qscale][mb].bits;
             max_bits += ctx->mb_rc[ctx->qscale][mb].bits;
             if (!RC_VARIANCE) {
                 delta_bits = ctx->mb_rc[ctx->qscale][mb].bits-ctx->mb_rc[ctx->qscale+1][mb].bits;
                 ctx->mb_cmp[mb].mb = mb;
                 ctx->mb_cmp[mb].value = delta_bits ?
                     ((ctx->mb_rc[ctx->qscale][mb].ssd-ctx->mb_rc[ctx->qscale+1][mb].ssd)*100)/delta_bits
                     : INT_MIN; //avoid increasing qscale
             }
         }
         max_bits += 31; //worst padding
     }

     if (!ret) {

         if (RC_VARIANCE)

             avctx->execute2(avctx, dnxhd_mb_var_thread, NULL, NULL, ctx->m.mb_height);

         radix_sort(ctx->mb_cmp, ctx->m.mb_num);

         for (x = 0; x < ctx->m.mb_num && max_bits > ctx->frame_bits; x++) {
             int mb = ctx->mb_cmp[x].mb;
             max_bits -= ctx->mb_rc[ctx->qscale][mb].bits - ctx->mb_rc[ctx->qscale+1][mb].bits;
             ctx->mb_qscale[mb] = ctx->qscale+1;
             ctx->mb_bits[mb] = ctx->mb_rc[ctx->qscale+1][mb].bits;
         }
     }
     return 0;
 }
 

 static void dnxhd_load_picture(DNXHDEncContext *ctx, const AVFrame *frame)

 {
     int i;
 
     for (i = 0; i < 3; i++) {
         ctx->frame.data[i]     = frame->data[i];
         ctx->frame.linesize[i] = frame->linesize[i];
     }
 
     for (i = 0; i < ctx->m.avctx->thread_count; i++) {
         ctx->thread[i]->m.linesize    = ctx->frame.linesize[0]<<ctx->interlaced;
         ctx->thread[i]->m.uvlinesize  = ctx->frame.linesize[1]<<ctx->interlaced;
         ctx->thread[i]->dct_y_offset  = ctx->m.linesize  *8;
         ctx->thread[i]->dct_uv_offset = ctx->m.uvlinesize*8;
     }
 
     ctx->frame.interlaced_frame = frame->interlaced_frame;
     ctx->cur_field = frame->interlaced_frame && !frame->top_field_first;
 }
 

 static int dnxhd_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
                                 const AVFrame *frame, int *got_packet)

 {
     DNXHDEncContext *ctx = avctx->priv_data;
     int first_field = 1;
     int offset, i, ret;

     uint8_t *buf;

     if ((ret = ff_alloc_packet2(avctx, pkt, ctx->cid_table->frame_size)) < 0)

         return ret;
     buf = pkt->data;

     dnxhd_load_picture(ctx, frame);

 
  encode_coding_unit:
     for (i = 0; i < 3; i++) {
         ctx->src[i] = ctx->frame.data[i];
         if (ctx->interlaced && ctx->cur_field)
             ctx->src[i] += ctx->frame.linesize[i];
     }
 
     dnxhd_write_header(avctx, buf);
 
     if (avctx->mb_decision == FF_MB_DECISION_RD)
         ret = dnxhd_encode_rdo(avctx, ctx);
     else

         ret = dnxhd_encode_fast(avctx, ctx);

     if (ret < 0) {

         av_log(avctx, AV_LOG_ERROR,
                "picture could not fit ratecontrol constraints, increase qmax\n");

         return -1;
     }
 

     dnxhd_setup_threads_slices(ctx);

 
     offset = 0;
     for (i = 0; i < ctx->m.mb_height; i++) {
         AV_WB32(ctx->msip + i * 4, offset);
         offset += ctx->slice_size[i];
         assert(!(ctx->slice_size[i] & 3));
     }
 

     avctx->execute2(avctx, dnxhd_encode_thread, buf, NULL, ctx->m.mb_height);

     assert(640 + offset + 4 <= ctx->cid_table->coding_unit_size);
     memset(buf + 640 + offset, 0, ctx->cid_table->coding_unit_size - 4 - offset - 640);
 

     AV_WB32(buf + ctx->cid_table->coding_unit_size - 4, 0x600DC0DE); // EOF
 
     if (ctx->interlaced && first_field) {
         first_field     = 0;
         ctx->cur_field ^= 1;
         buf      += ctx->cid_table->coding_unit_size;
         goto encode_coding_unit;
     }
 

     ctx->frame.quality = ctx->qscale*FF_QP2LAMBDA;
 

     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
     return 0;

 }
 
 static int dnxhd_encode_end(AVCodecContext *avctx)
 {
     DNXHDEncContext *ctx = avctx->priv_data;

     int max_level = 1<<(ctx->cid_table->bit_depth+2);

     int i;
 

     av_free(ctx->vlc_codes-max_level*2);
     av_free(ctx->vlc_bits -max_level*2);
     av_freep(&ctx->run_codes);
     av_freep(&ctx->run_bits);

 
     av_freep(&ctx->mb_bits);
     av_freep(&ctx->mb_qscale);
     av_freep(&ctx->mb_rc);
     av_freep(&ctx->mb_cmp);
     av_freep(&ctx->slice_size);

     av_freep(&ctx->slice_offs);

 
     av_freep(&ctx->qmatrix_c);
     av_freep(&ctx->qmatrix_l);
     av_freep(&ctx->qmatrix_c16);
     av_freep(&ctx->qmatrix_l16);
 
     for (i = 1; i < avctx->thread_count; i++)
         av_freep(&ctx->thread[i]);
 
     return 0;
 }
 

 static const AVCodecDefault dnxhd_defaults[] = {
     { "qmax", "1024" }, /* Maximum quantization scale factor allowed for VC-3 */
     { NULL },
 };
 

 AVCodec ff_dnxhd_encoder = {

     .name           = "dnxhd",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_DNXHD,
     .priv_data_size = sizeof(DNXHDEncContext),
     .init           = dnxhd_encode_init,

     .encode2        = dnxhd_encode_picture,

     .close          = dnxhd_encode_end,

     .capabilities   = CODEC_CAP_SLICE_THREADS,
     .pix_fmts       = (const enum PixelFormat[]){ PIX_FMT_YUV422P,
                                                   PIX_FMT_YUV422P10,
                                                   PIX_FMT_NONE },
     .long_name      = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
     .priv_class     = &class,

     .defaults       = dnxhd_defaults,

 };