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  1. /*
  2.  * VC3/DNxHD decoder.
  3.  * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
  4.  * Copyright (c) 2011 MirriAd Ltd
  5.  *
  6.  * 10 bit support added by MirriAd Ltd, Joseph Artsimovich <joseph@mirriad.com>
  7.  *
  8.  * This file is part of FFmpeg.
  9.  *
  10.  * FFmpeg is free software; you can redistribute it and/or
  11.  * modify it under the terms of the GNU Lesser General Public
  12.  * License as published by the Free Software Foundation; either
  13.  * version 2.1 of the License, or (at your option) any later version.
  14.  *
  15.  * FFmpeg is distributed in the hope that it will be useful,
  16.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18.  * Lesser General Public License for more details.
  19.  *
  20.  * You should have received a copy of the GNU Lesser General Public
  21.  * License along with FFmpeg; if not, write to the Free Software
  22.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23.  */
  24.  
  25. #include "libavutil/imgutils.h"
  26. #include "avcodec.h"
  27. #include "get_bits.h"
  28. #include "dnxhddata.h"
  29. #include "dsputil.h"
  30. #include "internal.h"
  31. #include "thread.h"
  32.  
  33. typedef struct DNXHDContext {
  34.     AVCodecContext *avctx;
  35.     GetBitContext gb;
  36.     int64_t cid;                        ///< compression id
  37.     unsigned int width, height;
  38.     unsigned int mb_width, mb_height;
  39.     uint32_t mb_scan_index[68];         /* max for 1080p */
  40.     int cur_field;                      ///< current interlaced field
  41.     VLC ac_vlc, dc_vlc, run_vlc;
  42.     int last_dc[3];
  43.     DSPContext dsp;
  44.     DECLARE_ALIGNED(16, int16_t, blocks)[8][64];
  45.     ScanTable scantable;
  46.     const CIDEntry *cid_table;
  47.     int bit_depth; // 8, 10 or 0 if not initialized at all.
  48.     void (*decode_dct_block)(struct DNXHDContext *ctx, int16_t *block,
  49.                              int n, int qscale);
  50.     int last_qscale;
  51.     int luma_scale[64];
  52.     int chroma_scale[64];
  53. } DNXHDContext;
  54.  
  55. #define DNXHD_VLC_BITS 9
  56. #define DNXHD_DC_VLC_BITS 7
  57.  
  58. static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block, int n, int qscale);
  59. static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block, int n, int qscale);
  60.  
  61. static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
  62. {
  63.     DNXHDContext *ctx = avctx->priv_data;
  64.  
  65.     ctx->avctx = avctx;
  66.     ctx->cid = -1;
  67.     return 0;
  68. }
  69.  
  70. static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid)
  71. {
  72.     if (cid != ctx->cid) {
  73.         int index;
  74.  
  75.         if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
  76.             av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
  77.             return -1;
  78.         }
  79.         if (ff_dnxhd_cid_table[index].bit_depth != ctx->bit_depth) {
  80.             av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, ctx->bit_depth);
  81.             return AVERROR_INVALIDDATA;
  82.         }
  83.         ctx->cid_table = &ff_dnxhd_cid_table[index];
  84.  
  85.         ff_free_vlc(&ctx->ac_vlc);
  86.         ff_free_vlc(&ctx->dc_vlc);
  87.         ff_free_vlc(&ctx->run_vlc);
  88.  
  89.         init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
  90.                  ctx->cid_table->ac_bits, 1, 1,
  91.                  ctx->cid_table->ac_codes, 2, 2, 0);
  92.         init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->bit_depth + 4,
  93.                  ctx->cid_table->dc_bits, 1, 1,
  94.                  ctx->cid_table->dc_codes, 1, 1, 0);
  95.         init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
  96.                  ctx->cid_table->run_bits, 1, 1,
  97.                  ctx->cid_table->run_codes, 2, 2, 0);
  98.  
  99.         ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
  100.         ctx->cid = cid;
  101.     }
  102.     return 0;
  103. }
  104.  
  105. static int dnxhd_decode_header(DNXHDContext *ctx, AVFrame *frame,
  106.                                const uint8_t *buf, int buf_size, int first_field)
  107. {
  108.     static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
  109.     int i, cid;
  110.  
  111.     if (buf_size < 0x280)
  112.         return -1;
  113.  
  114.     if (memcmp(buf, header_prefix, 5)) {
  115.         av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
  116.         return -1;
  117.     }
  118.     if (buf[5] & 2) { /* interlaced */
  119.         ctx->cur_field = buf[5] & 1;
  120.         frame->interlaced_frame = 1;
  121.         frame->top_field_first  = first_field ^ ctx->cur_field;
  122.         av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
  123.     }
  124.  
  125.     ctx->height = AV_RB16(buf + 0x18);
  126.     ctx->width  = AV_RB16(buf + 0x1a);
  127.  
  128.     av_dlog(ctx->avctx, "width %d, height %d\n", ctx->width, ctx->height);
  129.  
  130.     if (buf[0x21] & 0x40) {
  131.         ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
  132.         ctx->avctx->bits_per_raw_sample = 10;
  133.         if (ctx->bit_depth != 10) {
  134.             ff_dsputil_init(&ctx->dsp, ctx->avctx);
  135.             ctx->bit_depth = 10;
  136.             ctx->decode_dct_block = dnxhd_decode_dct_block_10;
  137.         }
  138.     } else {
  139.         ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
  140.         ctx->avctx->bits_per_raw_sample = 8;
  141.         if (ctx->bit_depth != 8) {
  142.             ff_dsputil_init(&ctx->dsp, ctx->avctx);
  143.             ctx->bit_depth = 8;
  144.             ctx->decode_dct_block = dnxhd_decode_dct_block_8;
  145.         }
  146.     }
  147.  
  148.     cid = AV_RB32(buf + 0x28);
  149.     av_dlog(ctx->avctx, "compression id %d\n", cid);
  150.  
  151.     if (dnxhd_init_vlc(ctx, cid) < 0)
  152.         return -1;
  153.  
  154.     if (buf_size < ctx->cid_table->coding_unit_size) {
  155.         av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
  156.         return -1;
  157.     }
  158.  
  159.     ctx->mb_width = ctx->width>>4;
  160.     ctx->mb_height = buf[0x16d];
  161.  
  162.     av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
  163.  
  164.     if ((ctx->height+15)>>4 == ctx->mb_height && frame->interlaced_frame)
  165.         ctx->height <<= 1;
  166.  
  167.     if (ctx->mb_height > 68 ||
  168.         (ctx->mb_height << frame->interlaced_frame) > (ctx->height+15)>>4) {
  169.         av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height);
  170.         return -1;
  171.     }
  172.  
  173.     for (i = 0; i < ctx->mb_height; i++) {
  174.         ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
  175.         av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
  176.         if (buf_size < ctx->mb_scan_index[i] + 0x280LL) {
  177.             av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
  178.             return -1;
  179.         }
  180.     }
  181.  
  182.     return 0;
  183. }
  184.  
  185. static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
  186.                                                     int16_t *block, int n,
  187.                                                     int qscale,
  188.                                                     int index_bits,
  189.                                                     int level_bias,
  190.                                                     int level_shift)
  191. {
  192.     int i, j, index1, index2, len, flags;
  193.     int level, component, sign;
  194.     const int *scale;
  195.     const uint8_t *weight_matrix;
  196.     const uint8_t *ac_level = ctx->cid_table->ac_level;
  197.     const uint8_t *ac_flags = ctx->cid_table->ac_flags;
  198.     const int eob_index     = ctx->cid_table->eob_index;
  199.     OPEN_READER(bs, &ctx->gb);
  200.  
  201.     if (n&2) {
  202.         component = 1 + (n&1);
  203.         scale = ctx->chroma_scale;
  204.         weight_matrix = ctx->cid_table->chroma_weight;
  205.     } else {
  206.         component = 0;
  207.         scale = ctx->luma_scale;
  208.         weight_matrix = ctx->cid_table->luma_weight;
  209.     }
  210.  
  211.     UPDATE_CACHE(bs, &ctx->gb);
  212.     GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
  213.     if (len) {
  214.         level = GET_CACHE(bs, &ctx->gb);
  215.         LAST_SKIP_BITS(bs, &ctx->gb, len);
  216.         sign  = ~level >> 31;
  217.         level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
  218.         ctx->last_dc[component] += level;
  219.     }
  220.     block[0] = ctx->last_dc[component];
  221.  
  222.     i = 0;
  223.  
  224.     UPDATE_CACHE(bs, &ctx->gb);
  225.     GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
  226.             DNXHD_VLC_BITS, 2);
  227.  
  228.     while (index1 != eob_index) {
  229.         level = ac_level[index1];
  230.         flags = ac_flags[index1];
  231.  
  232.         sign = SHOW_SBITS(bs, &ctx->gb, 1);
  233.         SKIP_BITS(bs, &ctx->gb, 1);
  234.  
  235.         if (flags & 1) {
  236.             level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 7;
  237.             SKIP_BITS(bs, &ctx->gb, index_bits);
  238.         }
  239.  
  240.         if (flags & 2) {
  241.             UPDATE_CACHE(bs, &ctx->gb);
  242.             GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
  243.                     DNXHD_VLC_BITS, 2);
  244.             i += ctx->cid_table->run[index2];
  245.         }
  246.  
  247.         if (++i > 63) {
  248.             av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
  249.             break;
  250.         }
  251.  
  252.         j = ctx->scantable.permutated[i];
  253.         level *= scale[i];
  254.         if (level_bias < 32 || weight_matrix[i] != level_bias)
  255.             level += level_bias;
  256.         level >>= level_shift;
  257.  
  258.         block[j] = (level^sign) - sign;
  259.  
  260.         UPDATE_CACHE(bs, &ctx->gb);
  261.         GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
  262.                 DNXHD_VLC_BITS, 2);
  263.     }
  264.  
  265.     CLOSE_READER(bs, &ctx->gb);
  266. }
  267.  
  268. static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, int16_t *block,
  269.                                      int n, int qscale)
  270. {
  271.     dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
  272. }
  273.  
  274. static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, int16_t *block,
  275.                                       int n, int qscale)
  276. {
  277.     dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
  278. }
  279.  
  280. static int dnxhd_decode_macroblock(DNXHDContext *ctx, AVFrame *frame, int x, int y)
  281. {
  282.     int shift1 = ctx->bit_depth == 10;
  283.     int dct_linesize_luma   = frame->linesize[0];
  284.     int dct_linesize_chroma = frame->linesize[1];
  285.     uint8_t *dest_y, *dest_u, *dest_v;
  286.     int dct_y_offset, dct_x_offset;
  287.     int qscale, i;
  288.  
  289.     qscale = get_bits(&ctx->gb, 11);
  290.     skip_bits1(&ctx->gb);
  291.  
  292.     if (qscale != ctx->last_qscale) {
  293.         for (i = 0; i < 64; i++) {
  294.             ctx->luma_scale[i]   = qscale * ctx->cid_table->luma_weight[i];
  295.             ctx->chroma_scale[i] = qscale * ctx->cid_table->chroma_weight[i];
  296.         }
  297.         ctx->last_qscale = qscale;
  298.     }
  299.  
  300.     for (i = 0; i < 8; i++) {
  301.         ctx->dsp.clear_block(ctx->blocks[i]);
  302.         ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
  303.     }
  304.  
  305.     if (frame->interlaced_frame) {
  306.         dct_linesize_luma   <<= 1;
  307.         dct_linesize_chroma <<= 1;
  308.     }
  309.  
  310.     dest_y = frame->data[0] + ((y * dct_linesize_luma)   << 4) + (x << (4 + shift1));
  311.     dest_u = frame->data[1] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
  312.     dest_v = frame->data[2] + ((y * dct_linesize_chroma) << 4) + (x << (3 + shift1));
  313.  
  314.     if (ctx->cur_field) {
  315.         dest_y += frame->linesize[0];
  316.         dest_u += frame->linesize[1];
  317.         dest_v += frame->linesize[2];
  318.     }
  319.  
  320.     dct_y_offset = dct_linesize_luma << 3;
  321.     dct_x_offset = 8 << shift1;
  322.     ctx->dsp.idct_put(dest_y,                               dct_linesize_luma, ctx->blocks[0]);
  323.     ctx->dsp.idct_put(dest_y + dct_x_offset,                dct_linesize_luma, ctx->blocks[1]);
  324.     ctx->dsp.idct_put(dest_y + dct_y_offset,                dct_linesize_luma, ctx->blocks[4]);
  325.     ctx->dsp.idct_put(dest_y + dct_y_offset + dct_x_offset, dct_linesize_luma, ctx->blocks[5]);
  326.  
  327.     if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
  328.         dct_y_offset = dct_linesize_chroma << 3;
  329.         ctx->dsp.idct_put(dest_u,                dct_linesize_chroma, ctx->blocks[2]);
  330.         ctx->dsp.idct_put(dest_v,                dct_linesize_chroma, ctx->blocks[3]);
  331.         ctx->dsp.idct_put(dest_u + dct_y_offset, dct_linesize_chroma, ctx->blocks[6]);
  332.         ctx->dsp.idct_put(dest_v + dct_y_offset, dct_linesize_chroma, ctx->blocks[7]);
  333.     }
  334.  
  335.     return 0;
  336. }
  337.  
  338. static int dnxhd_decode_macroblocks(DNXHDContext *ctx, AVFrame *frame,
  339.                                     const uint8_t *buf, int buf_size)
  340. {
  341.     int x, y;
  342.     for (y = 0; y < ctx->mb_height; y++) {
  343.         ctx->last_dc[0] =
  344.         ctx->last_dc[1] =
  345.         ctx->last_dc[2] = 1 << (ctx->bit_depth + 2); // for levels +2^(bitdepth-1)
  346.         init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
  347.         for (x = 0; x < ctx->mb_width; x++) {
  348.             //START_TIMER;
  349.             dnxhd_decode_macroblock(ctx, frame, x, y);
  350.             //STOP_TIMER("decode macroblock");
  351.         }
  352.     }
  353.     return 0;
  354. }
  355.  
  356. static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  357.                               AVPacket *avpkt)
  358. {
  359.     const uint8_t *buf = avpkt->data;
  360.     int buf_size = avpkt->size;
  361.     DNXHDContext *ctx = avctx->priv_data;
  362.     ThreadFrame frame = { .f = data };
  363.     AVFrame *picture = data;
  364.     int first_field = 1;
  365.     int ret;
  366.  
  367.     av_dlog(avctx, "frame size %d\n", buf_size);
  368.  
  369.  decode_coding_unit:
  370.     if (dnxhd_decode_header(ctx, picture, buf, buf_size, first_field) < 0)
  371.         return -1;
  372.  
  373.     if ((avctx->width || avctx->height) &&
  374.         (ctx->width != avctx->width || ctx->height != avctx->height)) {
  375.         av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n",
  376.                avctx->width, avctx->height, ctx->width, ctx->height);
  377.         first_field = 1;
  378.     }
  379.  
  380.     if (av_image_check_size(ctx->width, ctx->height, 0, avctx))
  381.         return -1;
  382.     avcodec_set_dimensions(avctx, ctx->width, ctx->height);
  383.  
  384.     if (first_field) {
  385.         if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
  386.             return ret;
  387.         picture->pict_type = AV_PICTURE_TYPE_I;
  388.         picture->key_frame = 1;
  389.     }
  390.  
  391.     dnxhd_decode_macroblocks(ctx, picture, buf + 0x280, buf_size - 0x280);
  392.  
  393.     if (first_field && picture->interlaced_frame) {
  394.         buf      += ctx->cid_table->coding_unit_size;
  395.         buf_size -= ctx->cid_table->coding_unit_size;
  396.         first_field = 0;
  397.         goto decode_coding_unit;
  398.     }
  399.  
  400.     *got_frame = 1;
  401.     return avpkt->size;
  402. }
  403.  
  404. static av_cold int dnxhd_decode_close(AVCodecContext *avctx)
  405. {
  406.     DNXHDContext *ctx = avctx->priv_data;
  407.  
  408.     ff_free_vlc(&ctx->ac_vlc);
  409.     ff_free_vlc(&ctx->dc_vlc);
  410.     ff_free_vlc(&ctx->run_vlc);
  411.     return 0;
  412. }
  413.  
  414. AVCodec ff_dnxhd_decoder = {
  415.     .name           = "dnxhd",
  416.     .long_name      = NULL_IF_CONFIG_SMALL("VC3/DNxHD"),
  417.     .type           = AVMEDIA_TYPE_VIDEO,
  418.     .id             = AV_CODEC_ID_DNXHD,
  419.     .priv_data_size = sizeof(DNXHDContext),
  420.     .init           = dnxhd_decode_init,
  421.     .close          = dnxhd_decode_close,
  422.     .decode         = dnxhd_decode_frame,
  423.     .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
  424. };
  425.