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FFmpeg/libavcodec/dnxhdenc.c

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  1. /*

  2.  * VC3/DNxHD encoder

  3.  * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  4.  *

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

  6.  *

  7.  * This file is part of FFmpeg.

  8.  *

  9.  * FFmpeg is free software; you can redistribute it and/or

  10.  * modify it under the terms of the GNU Lesser General Public

  11.  * License as published by the Free Software Foundation; either

  12.  * version 2.1 of the License, or (at your option) any later version.

  13.  *

  14.  * FFmpeg is distributed in the hope that it will be useful,

  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  17.  * Lesser General Public License for more details.

  18.  *

  19.  * You should have received a copy of the GNU Lesser General Public

  20.  * License along with FFmpeg; if not, write to the Free Software

  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  22.  */

  23. 

  24. //#define DEBUG

  25. #define RC_VARIANCE 1 // use variance or ssd for fast rc

  26. 

  27. #include "avcodec.h"

  28. #include "dsputil.h"

  29. #include "mpegvideo.h"

  30. #include "dnxhddata.h"

  31. 

  32. typedef struct {

  33.     uint16_t mb;

  34.     int value;

  35. } RCCMPEntry;

  36. 

  37. typedef struct {

  38.     int ssd;

  39.     int bits;

  40. } RCEntry;

  41. 

  42. int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);

  43. 

  44. typedef struct DNXHDEncContext {

  45.     MpegEncContext m; ///< Used for quantization dsp functions

  46. 

  47.     AVFrame frame;

  48.     int cid;

  49.     const CIDEntry *cid_table;

  50.     uint8_t *msip; ///< Macroblock Scan Indices Payload

  51.     uint32_t *slice_size;

  52. 

  53.     struct DNXHDEncContext *thread[MAX_THREADS];

  54. 

  55.     unsigned dct_y_offset;

  56.     unsigned dct_uv_offset;

  57.     int interlaced;

  58.     int cur_field;

  59. 

  60.     DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);

  61. 

  62.     int      (*qmatrix_c)     [64];

  63.     int      (*qmatrix_l)     [64];

  64.     uint16_t (*qmatrix_l16)[2][64];

  65.     uint16_t (*qmatrix_c16)[2][64];

  66. 

  67.     unsigned frame_bits;

  68.     uint8_t *src[3];

  69. 

  70.     uint16_t *table_vlc_codes;

  71.     uint8_t  *table_vlc_bits;

  72.     uint16_t *table_run_codes;

  73.     uint8_t  *table_run_bits;

  74. 

  75.     /** Rate control */

  76.     unsigned slice_bits;

  77.     unsigned qscale;

  78.     unsigned lambda;

  79. 

  80.     unsigned thread_size;

  81. 

  82.     uint16_t *mb_bits;

  83.     uint8_t  *mb_qscale;

  84. 

  85.     RCCMPEntry *mb_cmp;

  86.     RCEntry   (*mb_rc)[8160];

  87. } DNXHDEncContext;

  88. 

  89. #define LAMBDA_FRAC_BITS 10

  90. 

  91. static int dnxhd_init_vlc(DNXHDEncContext *ctx)

  92. {

  93.     int i;

  94. 

  95.     CHECKED_ALLOCZ(ctx->table_vlc_codes, 449*2);

  96.     CHECKED_ALLOCZ(ctx->table_vlc_bits,    449);

  97.     CHECKED_ALLOCZ(ctx->table_run_codes,  63*2);

  98.     CHECKED_ALLOCZ(ctx->table_run_bits,     63);

  99. 

  100.     for (i = 0; i < 257; i++) {

  101.         int level = ctx->cid_table->ac_level[i] +

  102.             (ctx->cid_table->ac_run_flag[i] << 7) + (ctx->cid_table->ac_index_flag[i] << 8);

  103.         assert(level < 449);

  104.         if (ctx->cid_table->ac_level[i] == 64 && ctx->cid_table->ac_index_flag[i])

  105.             level -= 64; // use 0+(1<<8) level

  106.         ctx->table_vlc_codes[level] = ctx->cid_table->ac_codes[i];

  107.         ctx->table_vlc_bits [level] = ctx->cid_table->ac_bits[i];

  108.     }

  109.     for (i = 0; i < 62; i++) {

  110.         int run = ctx->cid_table->run[i];

  111.         assert(run < 63);

  112.         ctx->table_run_codes[run] = ctx->cid_table->run_codes[i];

  113.         ctx->table_run_bits [run] = ctx->cid_table->run_bits[i];

  114.     }

  115.     return 0;

  116.  fail:

  117.     return -1;

  118. }

  119. 

  120. static int dnxhd_init_qmat(DNXHDEncContext *ctx, int lbias, int cbias)

  121. {

  122.     // init first elem to 1 to avoid div by 0 in convert_matrix

  123.     uint16_t weight_matrix[64] = {1,}; // convert_matrix needs uint16_t*

  124.     int qscale, i;

  125. 

  126.     CHECKED_ALLOCZ(ctx->qmatrix_l,   (ctx->m.avctx->qmax+1) * 64 * sizeof(int));

  127.     CHECKED_ALLOCZ(ctx->qmatrix_c,   (ctx->m.avctx->qmax+1) * 64 * sizeof(int));

  128.     CHECKED_ALLOCZ(ctx->qmatrix_l16, (ctx->m.avctx->qmax+1) * 64 * 2 * sizeof(uint16_t));

  129.     CHECKED_ALLOCZ(ctx->qmatrix_c16, (ctx->m.avctx->qmax+1) * 64 * 2 * sizeof(uint16_t));

  130. 

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

  132.         int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];

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

  134.     }

  135.     ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_l, ctx->qmatrix_l16, weight_matrix,

  136.                       ctx->m.intra_quant_bias, 1, ctx->m.avctx->qmax, 1);

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

  138.         int j = ctx->m.dsp.idct_permutation[ff_zigzag_direct[i]];

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

  140.     }

  141.     ff_convert_matrix(&ctx->m.dsp, ctx->qmatrix_c, ctx->qmatrix_c16, weight_matrix,

  142.                       ctx->m.intra_quant_bias, 1, ctx->m.avctx->qmax, 1);

  143.     for (qscale = 1; qscale <= ctx->m.avctx->qmax; qscale++) {

  144.         for (i = 0; i < 64; i++) {

  145.             ctx->qmatrix_l  [qscale]   [i] <<= 2; ctx->qmatrix_c  [qscale]   [i] <<= 2;

  146.             ctx->qmatrix_l16[qscale][0][i] <<= 2; ctx->qmatrix_l16[qscale][1][i] <<= 2;

  147.             ctx->qmatrix_c16[qscale][0][i] <<= 2; ctx->qmatrix_c16[qscale][1][i] <<= 2;

  148.         }

  149.     }

  150.     return 0;

  151.  fail:

  152.     return -1;

  153. }

  154. 

  155. static int dnxhd_init_rc(DNXHDEncContext *ctx)

  156. {

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

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

  159.         CHECKED_ALLOCZ(ctx->mb_cmp, ctx->m.mb_num*sizeof(RCCMPEntry));

  160. 

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

  162.     ctx->qscale = 1;

  163.     ctx->lambda = 2<<LAMBDA_FRAC_BITS; // qscale 2

  164.     return 0;

  165.  fail:

  166.     return -1;

  167. }

  168. 

  169. static int dnxhd_encode_init(AVCodecContext *avctx)

  170. {

  171.     DNXHDEncContext *ctx = avctx->priv_data;

  172.     int i, index;

  173. 

  174.     if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {

  175.         if      (avctx->bit_rate == 120000000)

  176.             ctx->cid = 1242;

  177.         else if (avctx->bit_rate == 185000000)

  178.             ctx->cid = 1243;

  179.     } else {

  180.         if      (avctx->bit_rate == 120000000)

  181.             ctx->cid = 1237;

  182.         else if (avctx->bit_rate == 185000000)

  183.             ctx->cid = 1238;

  184.         else if (avctx->bit_rate ==  36000000)

  185.             ctx->cid = 1253;

  186.     }

  187.     if (!ctx->cid || avctx->width != 1920 || avctx->height != 1080 || avctx->pix_fmt != PIX_FMT_YUV422P) {

  188.         av_log(avctx, AV_LOG_ERROR, "video parameters incompatible with DNxHD\n");

  189.         return -1;

  190.     }

  191. 

  192.     index = ff_dnxhd_get_cid_table(ctx->cid);

  193.     ctx->cid_table = &ff_dnxhd_cid_table[index];

  194. 

  195.     ctx->m.avctx = avctx;

  196.     ctx->m.mb_intra = 1;

  197.     ctx->m.h263_aic = 1;

  198. 

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

  200.     ff_dct_common_init(&ctx->m);

  201.     if (!ctx->m.dct_quantize)

  202.         ctx->m.dct_quantize = dct_quantize_c;

  203. 

  204.     ctx->m.mb_height = (avctx->height + 15) / 16;

  205.     ctx->m.mb_width  = (avctx->width  + 15) / 16;

  206. 

  207.     if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {

  208.         ctx->interlaced = 1;

  209.         ctx->m.mb_height /= 2;

  210.     }

  211. 

  212.     ctx->m.mb_num = ctx->m.mb_height * ctx->m.mb_width;

  213. 

  214.     if (avctx->intra_quant_bias != FF_DEFAULT_QUANT_BIAS)

  215.         ctx->m.intra_quant_bias = avctx->intra_quant_bias;

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

  217.         return -1;

  218. 

  219.     if (dnxhd_init_vlc(ctx) < 0)

  220.         return -1;

  221.     if (dnxhd_init_rc(ctx) < 0)

  222.         return -1;

  223. 

  224.     CHECKED_ALLOCZ(ctx->slice_size, ctx->m.mb_height*sizeof(uint32_t));

  225.     CHECKED_ALLOCZ(ctx->mb_bits,    ctx->m.mb_num   *sizeof(uint16_t));

  226.     CHECKED_ALLOCZ(ctx->mb_qscale,  ctx->m.mb_num   *sizeof(uint8_t));

  227. 

  228.     ctx->frame.key_frame = 1;

  229.     ctx->frame.pict_type = FF_I_TYPE;

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

  231. 

  232.     if (avctx->thread_count > MAX_THREADS || (avctx->thread_count > ctx->m.mb_height)) {

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

  234.         return -1;

  235.     }

  236. 

  237.     ctx->thread[0] = ctx;

  238.     for (i = 1; i < avctx->thread_count; i++) {

  239.         ctx->thread[i] =  av_malloc(sizeof(DNXHDEncContext));

  240.         memcpy(ctx->thread[i], ctx, sizeof(DNXHDEncContext));

  241.     }

  242. 

  243.     for (i = 0; i < avctx->thread_count; i++) {

  244.         ctx->thread[i]->m.start_mb_y = (ctx->m.mb_height*(i  ) + avctx->thread_count/2) / avctx->thread_count;

  245.         ctx->thread[i]->m.end_mb_y   = (ctx->m.mb_height*(i+1) + avctx->thread_count/2) / avctx->thread_count;

  246.     }

  247. 

  248.     return 0;

  249.  fail: //for CHECKED_ALLOCZ

  250.     return -1;

  251. }

  252. 

  253. static int dnxhd_write_header(AVCodecContext *avctx, uint8_t *buf)

  254. {

  255.     DNXHDEncContext *ctx = avctx->priv_data;

  256.     const uint8_t header_prefix[5] = { 0x00,0x00,0x02,0x80,0x01 };

  257. 

  258.     memcpy(buf, header_prefix, 5);

  259.     buf[5] = ctx->interlaced ? ctx->cur_field+2 : 0x01;

  260.     buf[6] = 0x80; // crc flag off

  261.     buf[7] = 0xa0; // reserved

  262.     AV_WB16(buf + 0x18, avctx->height); // ALPF

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

  264.     AV_WB16(buf + 0x1d, avctx->height); // NAL

  265. 

  266.     buf[0x21] = 0x38; // FIXME 8 bit per comp

  267.     buf[0x22] = 0x88 + (ctx->frame.interlaced_frame<<2);

  268.     AV_WB32(buf + 0x28, ctx->cid); // CID

  269.     buf[0x2c] = ctx->interlaced ? 0 : 0x80;

  270. 

  271.     buf[0x5f] = 0x01; // UDL

  272. 

  273.     buf[0x167] = 0x02; // reserved

  274.     AV_WB16(buf + 0x16a, ctx->m.mb_height * 4 + 4); // MSIPS

  275.     buf[0x16d] = ctx->m.mb_height; // Ns

  276.     buf[0x16f] = 0x10; // reserved

  277. 

  278.     ctx->msip = buf + 0x170;

  279.     return 0;

  280. }

  281. 

  282. static av_always_inline void dnxhd_encode_dc(DNXHDEncContext *ctx, int diff)

  283. {

  284.     int nbits;

  285.     if (diff < 0) {

  286.         nbits = av_log2_16bit(-2*diff);

  287.         diff--;

  288.     } else {

  289.         nbits = av_log2_16bit(2*diff);

  290.     }

  291.     put_bits(&ctx->m.pb, ctx->cid_table->dc_bits[nbits] + nbits,

  292.              (ctx->cid_table->dc_codes[nbits]<<nbits) + (diff & ((1 << nbits) - 1)));

  293. }

  294. 

  295. static av_always_inline void dnxhd_encode_block(DNXHDEncContext *ctx, DCTELEM *block, int last_index, int n)

  296. {

  297.     int last_non_zero = 0;

  298.     int offset = 0;

  299.     int slevel, i, j;

  300. 

  301.     dnxhd_encode_dc(ctx, block[0] - ctx->m.last_dc[n]);

  302.     ctx->m.last_dc[n] = block[0];

  303. 

  304.     for (i = 1; i <= last_index; i++) {

  305.         j = ctx->m.intra_scantable.permutated[i];

  306.         slevel = block[j];

  307.         if (slevel) {

  308.             int run_level = i - last_non_zero - 1;

  309.             int sign;

  310.             MASK_ABS(sign, slevel);

  311.             if (slevel > 64) {

  312.                 offset = (slevel-1) >> 6;

  313.                 slevel = 256 | (slevel & 63); // level 64 is treated as 0

  314.             }

  315.             if (run_level)

  316.                 slevel |= 128;

  317.             put_bits(&ctx->m.pb, ctx->table_vlc_bits[slevel]+1, (ctx->table_vlc_codes[slevel]<<1)|(sign&1));

  318.             if (offset) {

  319.                 put_bits(&ctx->m.pb, 4, offset);

  320.                 offset = 0;

  321.             }

  322.             if (run_level)

  323.                 put_bits(&ctx->m.pb, ctx->table_run_bits[run_level], ctx->table_run_codes[run_level]);

  324.             last_non_zero = i;

  325.         }

  326.     }

  327.     put_bits(&ctx->m.pb, ctx->table_vlc_bits[0], ctx->table_vlc_codes[0]); // EOB

  328. }

  329. 

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

  331. {

  332.     const uint8_t *weight_matrix;

  333.     int level;

  334.     int i;

  335. 

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

  337. 

  338.     for (i = 1; i <= last_index; i++) {

  339.         int j = ctx->m.intra_scantable.permutated[i];

  340.         level = block[j];

  341.         if (level) {

  342.             if (level < 0) {

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

  344.                 if (weight_matrix[i] != 32)

  345.                     level += 32;

  346.                 level >>= 6;

  347.                 level = -level;

  348.             } else {

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

  350.                 if (weight_matrix[i] != 32)

  351.                     level += 32;

  352.                 level >>= 6;

  353.             }

  354.             block[j] = level;

  355.         }

  356.     }

  357. }

  358. 

  359. static av_always_inline int dnxhd_ssd_block(DCTELEM *qblock, DCTELEM *block)

  360. {

  361.     int score = 0;

  362.     int i;

  363.     for (i = 0; i < 64; i++)

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

  365.     return score;

  366. }

  367. 

  368. static av_always_inline int dnxhd_calc_ac_bits(DNXHDEncContext *ctx, DCTELEM *block, int last_index)

  369. {

  370.     int last_non_zero = 0;

  371.     int bits = 0;

  372.     int i, j, level;

  373.     for (i = 1; i <= last_index; i++) {

  374.         j = ctx->m.intra_scantable.permutated[i];

  375.         level = block[j];

  376.         if (level) {

  377.             int run_level = i - last_non_zero - 1;

  378.             level = FFABS(level);

  379.             if (level > 64) {

  380.                 level = 256 | (level & 63); // level 64 is treated as 0

  381.                 bits += 4;

  382.             }

  383.             level |= (!!run_level)<<7;

  384.             bits += ctx->table_vlc_bits[level]+1 + ctx->table_run_bits[run_level];

  385.             last_non_zero = i;

  386.         }

  387.     }

  388.     return bits;

  389. }

  390. 

  391. static av_always_inline void dnxhd_get_pixels_4x8(DCTELEM *restrict block, const uint8_t *pixels, int line_size)

  392. {

  393.     int i;

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

  395.         block[0] = pixels[0];

  396.         block[1] = pixels[1];

  397.         block[2] = pixels[2];

  398.         block[3] = pixels[3];

  399.         block[4] = pixels[4];

  400.         block[5] = pixels[5];

  401.         block[6] = pixels[6];

  402.         block[7] = pixels[7];

  403.         pixels += line_size;

  404.         block += 8;

  405.     }

  406.     memcpy(block   , block- 8, sizeof(*block)*8);

  407.     memcpy(block+ 8, block-16, sizeof(*block)*8);

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

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

  410. }

  411. 

  412. static av_always_inline void dnxhd_get_blocks(DNXHDEncContext *ctx, int mb_x, int mb_y)

  413. {

  414.     const uint8_t *ptr_y = ctx->thread[0]->src[0] + ((mb_y << 4) * ctx->m.linesize)   + (mb_x << 4);

  415.     const uint8_t *ptr_u = ctx->thread[0]->src[1] + ((mb_y << 4) * ctx->m.uvlinesize) + (mb_x << 3);

  416.     const uint8_t *ptr_v = ctx->thread[0]->src[2] + ((mb_y << 4) * ctx->m.uvlinesize) + (mb_x << 3);

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

  418. 

  419.     dsp->get_pixels(ctx->blocks[0], ptr_y    , ctx->m.linesize);

  420.     dsp->get_pixels(ctx->blocks[1], ptr_y + 8, ctx->m.linesize);

  421.     dsp->get_pixels(ctx->blocks[2], ptr_u    , ctx->m.uvlinesize);

  422.     dsp->get_pixels(ctx->blocks[3], ptr_v    , ctx->m.uvlinesize);

  423. 

  424.     if (mb_y+1 == ctx->m.mb_height) {

  425.         if (ctx->interlaced) {

  426.             dnxhd_get_pixels_4x8(ctx->blocks[4], ptr_y + ctx->dct_y_offset    , ctx->m.linesize);

  427.             dnxhd_get_pixels_4x8(ctx->blocks[5], ptr_y + ctx->dct_y_offset + 8, ctx->m.linesize);

  428.             dnxhd_get_pixels_4x8(ctx->blocks[6], ptr_u + ctx->dct_uv_offset   , ctx->m.uvlinesize);

  429.             dnxhd_get_pixels_4x8(ctx->blocks[7], ptr_v + ctx->dct_uv_offset   , ctx->m.uvlinesize);

  430.         } else

  431.             memset(ctx->blocks[4], 0, 4*64*sizeof(DCTELEM));

  432.     } else {

  433.         dsp->get_pixels(ctx->blocks[4], ptr_y + ctx->dct_y_offset    , ctx->m.linesize);

  434.         dsp->get_pixels(ctx->blocks[5], ptr_y + ctx->dct_y_offset + 8, ctx->m.linesize);

  435.         dsp->get_pixels(ctx->blocks[6], ptr_u + ctx->dct_uv_offset   , ctx->m.uvlinesize);

  436.         dsp->get_pixels(ctx->blocks[7], ptr_v + ctx->dct_uv_offset   , ctx->m.uvlinesize);

  437.     }

  438. }

  439. 

  440. static av_always_inline int dnxhd_switch_matrix(DNXHDEncContext *ctx, int i)

  441. {

  442.     if (i&2) {

  443.         ctx->m.q_intra_matrix16 = ctx->qmatrix_c16;

  444.         ctx->m.q_intra_matrix   = ctx->qmatrix_c;

  445.         return 1 + (i&1);

  446.     } else {

  447.         ctx->m.q_intra_matrix16 = ctx->qmatrix_l16;

  448.         ctx->m.q_intra_matrix   = ctx->qmatrix_l;

  449.         return 0;

  450.     }

  451. }

  452. 

  453. static int dnxhd_calc_bits_thread(AVCodecContext *avctx, void *arg)

  454. {

  455.     DNXHDEncContext *ctx = arg;

  456.     int mb_y, mb_x;

  457.     int qscale = ctx->thread[0]->qscale;

  458. 

  459.     for (mb_y = ctx->m.start_mb_y; mb_y < ctx->m.end_mb_y; mb_y++) {

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

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

  462.         ctx->m.last_dc[2] = 1024;

  463. 

  464.         for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {

  465.             unsigned mb = mb_y * ctx->m.mb_width + mb_x;

  466.             int ssd     = 0;

  467.             int ac_bits = 0;

  468.             int dc_bits = 0;

  469.             int i;

  470. 

  471.             dnxhd_get_blocks(ctx, mb_x, mb_y);

  472. 

  473.             for (i = 0; i < 8; i++) {

  474.                 DECLARE_ALIGNED_16(DCTELEM, block[64]);

  475.                 DCTELEM *src_block = ctx->blocks[i];

  476.                 int overflow, nbits, diff, last_index;

  477.                 int n = dnxhd_switch_matrix(ctx, i);

  478. 

  479.                 memcpy(block, src_block, sizeof(block));

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

  481.                 ac_bits += dnxhd_calc_ac_bits(ctx, block, last_index);

  482. 

  483.                 diff = block[0] - ctx->m.last_dc[n];

  484.                 if (diff < 0) nbits = av_log2_16bit(-2*diff);

  485.                 else          nbits = av_log2_16bit( 2*diff);

  486.                 dc_bits += ctx->cid_table->dc_bits[nbits] + nbits;

  487. 

  488.                 ctx->m.last_dc[n] = block[0];

  489. 

  490.                 if (avctx->mb_decision == FF_MB_DECISION_RD || !RC_VARIANCE) {

  491.                     dnxhd_unquantize_c(ctx, block, i, qscale, last_index);

  492.                     ctx->m.dsp.idct(block);

  493.                     ssd += dnxhd_ssd_block(block, src_block);

  494.                 }

  495.             }

  496.             ctx->mb_rc[qscale][mb].ssd = ssd;

  497.             ctx->mb_rc[qscale][mb].bits = ac_bits+dc_bits+12+8*ctx->table_vlc_bits[0];

  498.         }

  499.     }

  500.     return 0;

  501. }

  502. 

  503. static int dnxhd_encode_thread(AVCodecContext *avctx, void *arg)

  504. {

  505.     DNXHDEncContext *ctx = arg;

  506.     int mb_y, mb_x;

  507. 

  508.     for (mb_y = ctx->m.start_mb_y; mb_y < ctx->m.end_mb_y; mb_y++) {

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

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

  511.         ctx->m.last_dc[2] = 1024;

  512.         for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {

  513.             unsigned mb = mb_y * ctx->m.mb_width + mb_x;

  514.             int qscale = ctx->mb_qscale[mb];

  515.             int i;

  516. 

  517.             put_bits(&ctx->m.pb, 12, qscale<<1);

  518. 

  519.             dnxhd_get_blocks(ctx, mb_x, mb_y);

  520. 

  521.             for (i = 0; i < 8; i++) {

  522.                 DCTELEM *block = ctx->blocks[i];

  523.                 int last_index, overflow;

  524.                 int n = dnxhd_switch_matrix(ctx, i);

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

  526.                 dnxhd_encode_block(ctx, block, last_index, n);

  527.             }

  528.         }

  529.         if (put_bits_count(&ctx->m.pb)&31)

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

  531.     }

  532.     flush_put_bits(&ctx->m.pb);

  533.     return 0;

  534. }

  535. 

  536. static void dnxhd_setup_threads_slices(DNXHDEncContext *ctx, uint8_t *buf)

  537. {

  538.     int mb_y, mb_x;

  539.     int i, offset = 0;

  540.     for (i = 0; i < ctx->m.avctx->thread_count; i++) {

  541.         int thread_size = 0;

  542.         for (mb_y = ctx->thread[i]->m.start_mb_y; mb_y < ctx->thread[i]->m.end_mb_y; mb_y++) {

  543.             ctx->slice_size[mb_y] = 0;

  544.             for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {

  545.                 unsigned mb = mb_y * ctx->m.mb_width + mb_x;

  546.                 ctx->slice_size[mb_y] += ctx->mb_bits[mb];

  547.             }

  548.             ctx->slice_size[mb_y] = (ctx->slice_size[mb_y]+31)&~31;

  549.             ctx->slice_size[mb_y] >>= 3;

  550.             thread_size += ctx->slice_size[mb_y];

  551.         }

  552.         init_put_bits(&ctx->thread[i]->m.pb, buf + 640 + offset, thread_size);

  553.         offset += thread_size;

  554.     }

  555. }

  556. 

  557. static int dnxhd_mb_var_thread(AVCodecContext *avctx, void *arg)

  558. {

  559.     DNXHDEncContext *ctx = arg;

  560.     int mb_y, mb_x;

  561.     for (mb_y = ctx->m.start_mb_y; mb_y < ctx->m.end_mb_y; mb_y++) {

  562.         for (mb_x = 0; mb_x < ctx->m.mb_width; mb_x++) {

  563.             unsigned mb  = mb_y * ctx->m.mb_width + mb_x;

  564.             uint8_t *pix = ctx->thread[0]->src[0] + ((mb_y<<4) * ctx->m.linesize) + (mb_x<<4);

  565.             int sum      = ctx->m.dsp.pix_sum(pix, ctx->m.linesize);

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

  567.             ctx->mb_cmp[mb].value = varc;

  568.             ctx->mb_cmp[mb].mb = mb;

  569.         }

  570.     }

  571.     return 0;

  572. }

  573. 

  574. static int dnxhd_encode_rdo(AVCodecContext *avctx, DNXHDEncContext *ctx)

  575. {

  576.     int lambda, up_step, down_step;

  577.     int last_lower = INT_MAX, last_higher = 0;

  578.     int x, y, q;

  579. 

  580.     for (q = 1; q < avctx->qmax; q++) {

  581.         ctx->qscale = q;

  582.         avctx->execute(avctx, dnxhd_calc_bits_thread, (void**)&ctx->thread[0], NULL, avctx->thread_count);

  583.     }

  584.     up_step = down_step = 2<<LAMBDA_FRAC_BITS;

  585.     lambda = ctx->lambda;

  586. 

  587.     for (;;) {

  588.         int bits = 0;

  589.         int end = 0;

  590.         if (lambda == last_higher) {

  591.             lambda++;

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

  593.         }

  594.         for (y = 0; y < ctx->m.mb_height; y++) {

  595.             for (x = 0; x < ctx->m.mb_width; x++) {

  596.                 unsigned min = UINT_MAX;

  597.                 int qscale = 1;

  598.                 int mb = y*ctx->m.mb_width+x;

  599.                 for (q = 1; q < avctx->qmax; q++) {

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

  601.                     if (score < min) {

  602.                         min = score;

  603.                         qscale = q;

  604.                     }

  605.                 }

  606.                 bits += ctx->mb_rc[qscale][mb].bits;

  607.                 ctx->mb_qscale[mb] = qscale;

  608.                 ctx->mb_bits[mb] = ctx->mb_rc[qscale][mb].bits;

  609.             }

  610.             bits = (bits+31)&~31; // padding

  611.             if (bits > ctx->frame_bits)

  612.                 break;

  613.         }

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

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

  616.         if (end) {

  617.             if (bits > ctx->frame_bits)

  618.                 return -1;

  619.             break;

  620.         }

  621.         if (bits < ctx->frame_bits) {

  622.             last_lower = FFMIN(lambda, last_lower);

  623.             if (last_higher != 0)

  624.                 lambda = (lambda+last_higher)>>1;

  625.             else

  626.                 lambda -= down_step;

  627.             down_step *= 5; // XXX tune ?

  628.             up_step = 1<<LAMBDA_FRAC_BITS;

  629.             lambda = FFMAX(1, lambda);

  630.             if (lambda == last_lower)

  631.                 break;

  632.         } else {

  633.             last_higher = FFMAX(lambda, last_higher);

  634.             if (last_lower != INT_MAX)

  635.                 lambda = (lambda+last_lower)>>1;

  636.             else

  637.                 lambda += up_step;

  638.             up_step *= 5;

  639.             down_step = 1<<LAMBDA_FRAC_BITS;

  640.         }

  641.     }

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

  643.     ctx->lambda = lambda;

  644.     return 0;

  645. }

  646. 

  647. static int dnxhd_find_qscale(DNXHDEncContext *ctx)

  648. {

  649.     int bits = 0;

  650.     int up_step = 1;

  651.     int down_step = 1;

  652.     int last_higher = 0;

  653.     int last_lower = INT_MAX;

  654.     int qscale;

  655.     int x, y;

  656. 

  657.     qscale = ctx->qscale;

  658.     for (;;) {

  659.         bits = 0;

  660.         ctx->qscale = qscale;

  661.         // XXX avoid recalculating bits

  662.         ctx->m.avctx->execute(ctx->m.avctx, dnxhd_calc_bits_thread, (void**)&ctx->thread[0], NULL, ctx->m.avctx->thread_count);

  663.         for (y = 0; y < ctx->m.mb_height; y++) {

  664.             for (x = 0; x < ctx->m.mb_width; x++)

  665.                 bits += ctx->mb_rc[qscale][y*ctx->m.mb_width+x].bits;

  666.             bits = (bits+31)&~31; // padding

  667.             if (bits > ctx->frame_bits)

  668.                 break;

  669.         }

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

  671.         //        ctx->m.avctx->frame_number, qscale, bits, ctx->frame_bits, last_higher, last_lower);

  672.         if (bits < ctx->frame_bits) {

  673.             if (qscale == 1)

  674.                 break;

  675.             if (last_higher == qscale - 1) {

  676.                 qscale = last_higher;

  677.                 break;

  678.             }

  679.             last_lower = FFMIN(qscale, last_lower);

  680.             if (last_higher != 0)

  681.                 qscale = (qscale+last_higher)>>1;

  682.             else

  683.                 qscale -= down_step++;

  684.             if (qscale < 1)

  685.                 qscale = 1;

  686.             up_step = 1;

  687.         } else {

  688.             if (last_lower == qscale + 1)

  689.                 break;

  690.             last_higher = FFMAX(qscale, last_higher);

  691.             if (last_lower != INT_MAX)

  692.                 qscale = (qscale+last_lower)>>1;

  693.             else

  694.                 qscale += up_step++;

  695.             down_step = 1;

  696.             if (qscale >= ctx->m.avctx->qmax)

  697.                 return -1;

  698.         }

  699.     }

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

  701.     ctx->qscale = qscale;

  702.     return 0;

  703. }

  704. 

  705. static int dnxhd_rc_cmp(const void *a, const void *b)

  706. {

  707.     return ((RCCMPEntry *)b)->value - ((RCCMPEntry *)a)->value;

  708. }

  709. 

  710. static int dnxhd_encode_variance(AVCodecContext *avctx, DNXHDEncContext *ctx)

  711. {

  712.     int max_bits = 0;

  713.     int x, y;

  714.     if (dnxhd_find_qscale(ctx) < 0)

  715.         return -1;

  716.     for (y = 0; y < ctx->m.mb_height; y++) {

  717.         for (x = 0; x < ctx->m.mb_width; x++) {

  718.             int mb = y*ctx->m.mb_width+x;

  719.             int delta_bits;

  720.             ctx->mb_qscale[mb] = ctx->qscale;

  721.             ctx->mb_bits[mb] = ctx->mb_rc[ctx->qscale][mb].bits;

  722.             max_bits += ctx->mb_rc[ctx->qscale][mb].bits;

  723.             if (!RC_VARIANCE) {

  724.                 delta_bits = ctx->mb_rc[ctx->qscale][mb].bits-ctx->mb_rc[ctx->qscale+1][mb].bits;

  725.                 ctx->mb_cmp[mb].mb = mb;

  726.                 ctx->mb_cmp[mb].value = delta_bits ?

  727.                     ((ctx->mb_rc[ctx->qscale][mb].ssd-ctx->mb_rc[ctx->qscale+1][mb].ssd)*100)/delta_bits

  728.                     : INT_MIN; //avoid increasing qscale

  729.             }

  730.         }

  731.         max_bits += 31; //worst padding

  732.     }

  733.     if (max_bits > ctx->frame_bits) {

  734.         if (RC_VARIANCE)

  735.             avctx->execute(avctx, dnxhd_mb_var_thread, (void**)&ctx->thread[0], NULL, avctx->thread_count);

  736.         qsort(ctx->mb_cmp, ctx->m.mb_num, sizeof(RCEntry), dnxhd_rc_cmp);

  737.         for (x = 0; x < ctx->m.mb_num && max_bits > ctx->frame_bits; x++) {

  738.             int mb = ctx->mb_cmp[x].mb;

  739.             max_bits -= ctx->mb_rc[ctx->qscale][mb].bits - ctx->mb_rc[ctx->qscale+1][mb].bits;

  740.             ctx->mb_qscale[mb] = ctx->qscale+1;

  741.             ctx->mb_bits[mb] = ctx->mb_rc[ctx->qscale+1][mb].bits;

  742.         }

  743.     }

  744.     return 0;

  745. }

  746. 

  747. static void dnxhd_load_picture(DNXHDEncContext *ctx, AVFrame *frame)

  748. {

  749.     int i;

  750. 

  751.     for (i = 0; i < 3; i++) {

  752.         ctx->frame.data[i]     = frame->data[i];

  753.         ctx->frame.linesize[i] = frame->linesize[i];

  754.     }

  755. 

  756.     for (i = 0; i < ctx->m.avctx->thread_count; i++) {

  757.         ctx->thread[i]->m.linesize    = ctx->frame.linesize[0]<<ctx->interlaced;

  758.         ctx->thread[i]->m.uvlinesize  = ctx->frame.linesize[1]<<ctx->interlaced;

  759.         ctx->thread[i]->dct_y_offset  = ctx->m.linesize  *8;

  760.         ctx->thread[i]->dct_uv_offset = ctx->m.uvlinesize*8;

  761.     }

  762. 

  763.     ctx->frame.interlaced_frame = frame->interlaced_frame;

  764.     ctx->cur_field = frame->interlaced_frame && !frame->top_field_first;

  765. }

  766. 

  767. static int dnxhd_encode_picture(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)

  768. {

  769.     DNXHDEncContext *ctx = avctx->priv_data;

  770.     int first_field = 1;

  771.     int offset, i, ret;

  772. 

  773.     if (buf_size < ctx->cid_table->frame_size) {

  774.         av_log(avctx, AV_LOG_ERROR, "output buffer is too small to compress picture\n");

  775.         return -1;

  776.     }

  777. 

  778.     dnxhd_load_picture(ctx, data);

  779. 

  780.  encode_coding_unit:

  781.     for (i = 0; i < 3; i++) {

  782.         ctx->src[i] = ctx->frame.data[i];

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

  784.             ctx->src[i] += ctx->frame.linesize[i];

  785.     }

  786. 

  787.     dnxhd_write_header(avctx, buf);

  788. 

  789.     if (avctx->mb_decision == FF_MB_DECISION_RD)

  790.         ret = dnxhd_encode_rdo(avctx, ctx);

  791.     else

  792.         ret = dnxhd_encode_variance(avctx, ctx);

  793.     if (ret < 0) {

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

  795.         return -1;

  796.     }

  797. 

  798.     dnxhd_setup_threads_slices(ctx, buf);

  799. 

  800.     offset = 0;

  801.     for (i = 0; i < ctx->m.mb_height; i++) {

  802.         AV_WB32(ctx->msip + i * 4, offset);

  803.         offset += ctx->slice_size[i];

  804.         assert(!(ctx->slice_size[i] & 3));

  805.     }

  806. 

  807.     avctx->execute(avctx, dnxhd_encode_thread, (void**)&ctx->thread[0], NULL, avctx->thread_count);

  808. 

  809.     AV_WB32(buf + ctx->cid_table->coding_unit_size - 4, 0x600DC0DE); // EOF

  810. 

  811.     if (ctx->interlaced && first_field) {

  812.         first_field     = 0;

  813.         ctx->cur_field ^= 1;

  814.         buf      += ctx->cid_table->coding_unit_size;

  815.         buf_size -= ctx->cid_table->coding_unit_size;

  816.         goto encode_coding_unit;

  817.     }

  818. 

  819.     return ctx->cid_table->frame_size;

  820. }

  821. 

  822. static int dnxhd_encode_end(AVCodecContext *avctx)

  823. {

  824.     DNXHDEncContext *ctx = avctx->priv_data;

  825.     int i;

  826. 

  827.     av_freep(&ctx->table_vlc_codes);

  828.     av_freep(&ctx->table_vlc_bits);

  829.     av_freep(&ctx->table_run_codes);

  830.     av_freep(&ctx->table_run_bits);

  831. 

  832.     av_freep(&ctx->mb_bits);

  833.     av_freep(&ctx->mb_qscale);

  834.     av_freep(&ctx->mb_rc);

  835.     av_freep(&ctx->mb_cmp);

  836.     av_freep(&ctx->slice_size);

  837. 

  838.     av_freep(&ctx->qmatrix_c);

  839.     av_freep(&ctx->qmatrix_l);

  840.     av_freep(&ctx->qmatrix_c16);

  841.     av_freep(&ctx->qmatrix_l16);

  842. 

  843.     for (i = 1; i < avctx->thread_count; i++)

  844.         av_freep(&ctx->thread[i]);

  845. 

  846.     return 0;

  847. }

  848. 

  849. AVCodec dnxhd_encoder = {

  850.     "dnxhd",

  851.     CODEC_TYPE_VIDEO,

  852.     CODEC_ID_DNXHD,

  853.     sizeof(DNXHDEncContext),

  854.     dnxhd_encode_init,

  855.     dnxhd_encode_picture,

  856.     dnxhd_encode_end,

  857.     .pix_fmts = (enum PixelFormat[]){PIX_FMT_YUV422P, -1},

  858. };