/*
  * 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
  */
 

 #include "libavutil/attributes.h"

 #include "libavutil/internal.h"

 #include "libavutil/opt.h"

 #include "libavutil/timer.h"

 #include "avcodec.h"

 #include "blockdsp.h"

 #include "fdctdsp.h"

 #include "internal.h"

 #include "mpegvideo.h"

 #include "pixblockdsp.h"

 #include "dnxhdenc.h"

 // The largest value that will not lead to overflow for 10bit samples.
 #define DNX10BIT_QMAT_SHIFT 18
 #define RC_VARIANCE 1 // use variance or ssd for fast rc
 #define LAMBDA_FRAC_BITS 10

 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
     { "nitris_compat", "encode with Avid Nitris compatibility",
         offsetof(DNXHDEncContext, nitris_compat), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },
     { NULL }

 };

 static const AVClass dnxhd_class = {

     .class_name = "dnxhd",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 static void dnxhd_8bit_get_pixels_8x4_sym(int16_t *av_restrict block,

                                           const uint8_t *pixels,

                                           ptrdiff_t 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(int16_t *av_restrict block,

                                     const uint8_t *pixels,

                                     ptrdiff_t line_size)

 {
     int i;

     const uint16_t* pixels16 = (const uint16_t*)pixels;

     line_size >>= 1;

 
     for (i = 0; i < 4; i++) {

         block[0] = pixels16[0]; block[1] = pixels16[1];
         block[2] = pixels16[2]; block[3] = pixels16[3];
         block[4] = pixels16[4]; block[5] = pixels16[5];
         block[6] = pixels16[6]; block[7] = pixels16[7];
         pixels16 += 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 int dnxhd_10bit_dct_quantize(MpegEncContext *ctx, int16_t *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->fdsp.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 av_cold 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)) {

                     av_assert1(!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;
                 }
             }

             av_assert0(!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];

         av_assert0(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 AVERROR(ENOMEM);

 }
 

 static av_cold 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.idsp.idct_permutation[ff_zigzag_direct[i]];

             weight_matrix[j] = ctx->cid_table->luma_weight[i];
         }

         ff_convert_matrix(&ctx->m, 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.idsp.idct_permutation[ff_zigzag_direct[i]];

             weight_matrix[j] = ctx->cid_table->chroma_weight[i];
         }

         ff_convert_matrix(&ctx->m, 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.idsp.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 AVERROR(ENOMEM);

 }
 

 static av_cold int dnxhd_init_rc(DNXHDEncContext *ctx)

 {

     FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_rc, 8160 * (ctx->m.avctx->qmax + 1) * 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 AVERROR(ENOMEM);

 }
 

 static av_cold int dnxhd_encode_init(AVCodecContext *avctx)

 {
     DNXHDEncContext *ctx = avctx->priv_data;

     int i, index, bit_depth, ret;

 
     switch (avctx->pix_fmt) {

     case AV_PIX_FMT_YUV422P:

         bit_depth = 8;
         break;

     case AV_PIX_FMT_YUV422P10:

         bit_depth = 10;
         break;
     default:

         av_log(avctx, AV_LOG_ERROR,
                "pixel format is incompatible with DNxHD\n");

         return AVERROR(EINVAL);

     }

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

         av_log(avctx, AV_LOG_ERROR,

                "video parameters incompatible with DNxHD. Valid DNxHD profiles:\n");

         ff_dnxhd_print_profiles(avctx, AV_LOG_ERROR);

         return AVERROR(EINVAL);

     }

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

 
     index = ff_dnxhd_get_cid_table(ctx->cid);

     av_assert0(index >= 0);

     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_blockdsp_init(&ctx->bdsp, avctx);

     ff_fdctdsp_init(&ctx->m.fdsp, avctx);

     ff_idctdsp_init(&ctx->m.idsp, avctx);

     ff_mpegvideoencdsp_init(&ctx->m.mpvencdsp, avctx);

     ff_pixblockdsp_init(&ctx->m.pdsp, avctx);

     ff_dct_common_init(&ctx->m);

     ff_dct_encode_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 (ARCH_X86)
         ff_dnxhdenc_init_x86(ctx);

 
     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;

     // XXX tune lbias/cbias
     if ((ret = dnxhd_init_qmat(ctx, ctx->m.intra_quant_bias, 0)) < 0)

         return ret;

     /* Avid Nitris hardware decoder requires a minimum amount of padding
      * in the coding unit payload */

     if (ctx->nitris_compat)
         ctx->min_padding = 1600;
 

     if ((ret = dnxhd_init_vlc(ctx)) < 0)
         return ret;
     if ((ret = dnxhd_init_rc(ctx)) < 0)
         return ret;

     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);

     avctx->coded_frame = av_frame_alloc();
     if (!avctx->coded_frame)
         return AVERROR(ENOMEM);
 
     avctx->coded_frame->key_frame = 1;
     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

     if (avctx->thread_count > MAX_THREADS) {

         av_log(avctx, AV_LOG_ERROR, "too many threads\n");

         return AVERROR(EINVAL);

     }
 

     if (avctx->qmax <= 1) {
         av_log(avctx, AV_LOG_ERROR, "qmax must be at least 2\n");
         return AVERROR(EINVAL);
     }
 

     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 AVERROR(ENOMEM);

 }
 
 static int dnxhd_write_header(AVCodecContext *avctx, uint8_t *buf)
 {
     DNXHDEncContext *ctx = avctx->priv_data;

     static 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, int16_t *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, int16_t *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(int16_t *qblock, int16_t *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, int16_t *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);

     PixblockDSPContext *pdsp = &ctx->m.pdsp;

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

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

         }

     } else {

         pdsp->get_pixels(ctx->blocks[4],
                          ptr_y + ctx->dct_y_offset, ctx->m.linesize);
         pdsp->get_pixels(ctx->blocks[5],
                          ptr_y + ctx->dct_y_offset + bw, ctx->m.linesize);
         pdsp->get_pixels(ctx->blocks[6],
                          ptr_u + ctx->dct_uv_offset, ctx->m.uvlinesize);
         pdsp->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(int16_t, 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++) {

             int16_t *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);

             av_assert1(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.idsp.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++) {

             int16_t *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, x, y;
     int partial_last_row = (mb_y == ctx->m.mb_height - 1) &&
                            ((avctx->height >> ctx->interlaced) & 0xF);
 

     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;
             int varc;
 
             if (!partial_last_row && mb_x * 16 <= avctx->width - 16) {

                 sum  = ctx->m.mpvencdsp.pix_sum(pix, ctx->m.linesize);
                 varc = ctx->m.mpvencdsp.pix_norm1(pix, ctx->m.linesize);

             } else {
                 int bw = FFMIN(avctx->width - 16 * mb_x, 16);
                 int bh = FFMIN((avctx->height >> ctx->interlaced) - 16 * mb_y, 16);
                 sum = varc = 0;
                 for (y = 0; y < bh; y++) {
                     for (x = 0; x < bw; x++) {
                         uint8_t val = pix[x + y * ctx->m.linesize];
                         sum  += val;
                         varc += val * val;
                     }
                 }
             }

             varc = (varc - (((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 AVERROR(EINVAL);

             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 AVERROR(EINVAL);

             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 AVERROR(EINVAL);

         }
     }

     //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;
         }

         av_assert1(!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];

         av_assert1(!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_array(size, sizeof(*tmp));

     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 ret;

     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 < ctx->m.avctx->thread_count; i++) {

         ctx->thread[i]->m.linesize    = frame->linesize[0] << ctx->interlaced;
         ctx->thread[i]->m.uvlinesize  = 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->m.avctx->coded_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] = frame->data[i];

         if (ctx->interlaced && ctx->cur_field)

             ctx->src[i] += 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 ret;

     }
 

     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];

         av_assert1(!(ctx->slice_size[i] & 3));

     }
 

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

     av_assert1(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;
     }
 

     avctx->coded_frame->quality = ctx->qscale * FF_QP2LAMBDA;

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

 }
 

 static av_cold 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]);
 

     av_frame_free(&avctx->coded_frame);
 

     return 0;
 }
 

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

 AVCodec ff_dnxhd_encoder = {

     .name           = "dnxhd",

     .long_name      = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_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 AVPixelFormat[]) {
         AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV422P10,
         AV_PIX_FMT_NONE
     },

     .priv_class     = &dnxhd_class,

     .defaults       = dnxhd_defaults,

 };