libavcodec/dnxhddec.c

   1 /*
   2  * VC3/DNxHD decoder.
   3  * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 //#define TRACE
  23 //#define DEBUG
  24
  25 #include "avcodec.h"
  26 #include "bitstream.h"
  27 #include "dnxhddata.h"
  28 #include "dsputil.h"
  29 #include "mpegvideo.h"
  30
  31 typedef struct {
  32     AVCodecContext *avctx;
  33     AVFrame picture;
  34     GetBitContext gb;
  35     int cid;                            ///< compression id
  36     unsigned int width, height;
  37     unsigned int mb_width, mb_height;
  38     uint32_t mb_scan_index[68];         /* max for 1080p */
  39     int cur_field;                      ///< current interlaced field
  40     VLC ac_vlc, dc_vlc, run_vlc;
  41     int last_dc[3];
  42     DSPContext dsp;
  43     DECLARE_ALIGNED_16(DCTELEM, blocks[8][64]);
  44     DECLARE_ALIGNED_8(ScanTable, scantable);
  45     const CIDEntry *cid_table;
  46 } DNXHDContext;
  47
  48 #define DNXHD_VLC_BITS 9
  49 #define DNXHD_DC_VLC_BITS 7
  50
  51 static int dnxhd_decode_init(AVCodecContext *avctx)
  52 {
  53     DNXHDContext *ctx = avctx->priv_data;
  54
  55     ctx->avctx = avctx;
  56     dsputil_init(&ctx->dsp, avctx);
  57     avctx->coded_frame = &ctx->picture;
  58     ctx->picture.type = FF_I_TYPE;
  59     return 0;
  60 }
  61
  62 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
  63 {
  64     if (!ctx->cid_table) {
  65         int index;
  66
  67         if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
  68             av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid);
  69             return -1;
  70         }
  71         ctx->cid_table = &ff_dnxhd_cid_table[index];
  72         init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
  73                  ctx->cid_table->ac_bits, 1, 1,
  74                  ctx->cid_table->ac_codes, 2, 2, 0);
  75         init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4,
  76                  ctx->cid_table->dc_bits, 1, 1,
  77                  ctx->cid_table->dc_codes, 1, 1, 0);
  78         init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
  79                  ctx->cid_table->run_bits, 1, 1,
  80                  ctx->cid_table->run_codes, 2, 2, 0);
  81
  82         ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
  83     }
  84     return 0;
  85 }
  86
  87 static int dnxhd_decode_header(DNXHDContext *ctx, uint8_t *buf, int buf_size, int first_field)
  88 {
  89     static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
  90     int i;
  91
  92     if (buf_size < 0x280)
  93         return -1;
  94
  95     if (memcmp(buf, header_prefix, 5)) {
  96         av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n");
  97         return -1;
  98     }
  99     if (buf[5] & 2) { /* interlaced */
 100         ctx->cur_field = buf[5] & 1;
 101         ctx->picture.interlaced_frame = 1;
 102         ctx->picture.top_field_first = first_field && ctx->cur_field == 1;
 103         av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field);
 104     }
 105
 106     ctx->height = AV_RB16(buf + 0x18);
 107     ctx->width  = AV_RB16(buf + 0x1a);
 108
 109     dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height);
 110
 111     if (buf[0x21] & 0x40) {
 112         av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n");
 113         return -1;
 114     }
 115
 116     ctx->cid = AV_RB32(buf + 0x28);
 117     dprintf(ctx->avctx, "compression id %d\n", ctx->cid);
 118
 119     if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
 120         return -1;
 121
 122     if (buf_size < ctx->cid_table->coding_unit_size) {
 123         av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n");
 124         return -1;
 125     }
 126
 127     ctx->mb_width = ctx->width>>4;
 128     ctx->mb_height = buf[0x16d];
 129
 130     if (ctx->mb_height > 68) {
 131         av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big\n");
 132         return -1;
 133     }
 134
 135     dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height);
 136     for (i = 0; i < ctx->mb_height; i++) {
 137         ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2));
 138         dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]);
 139         if (buf_size < ctx->mb_scan_index[i] + 0x280) {
 140             av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n");
 141             return -1;
 142         }
 143     }
 144
 145     return 0;
 146 }
 147
 148 static int dnxhd_decode_dc(DNXHDContext *ctx)
 149 {
 150     int len;
 151
 152     len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
 153     return len ? get_xbits(&ctx->gb, len) : 0;
 154 }
 155
 156 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
 157 {
 158     int i, j, index, index2;
 159     int level, component, sign;
 160     const uint8_t *weigth_matrix;
 161
 162     if (n&2) {
 163         component = 1 + (n&1);
 164         weigth_matrix = ctx->cid_table->chroma_weight;
 165     } else {
 166         component = 0;
 167         weigth_matrix = ctx->cid_table->luma_weight;
 168     }
 169
 170     ctx->last_dc[component] += dnxhd_decode_dc(ctx);
 171     block[0] = ctx->last_dc[component];
 172     //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);
 173     for (i = 1; ; i++) {
 174         index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
 175         //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
 176         level = ctx->cid_table->ac_level[index];
 177         if (!level) { /* EOB */
 178             //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
 179             return;
 180         }
 181         sign = get_sbits(&ctx->gb, 1);
 182
 183         if (ctx->cid_table->ac_index_flag[index]) {
 184             level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
 185         }
 186
 187         if (ctx->cid_table->ac_run_flag[index]) {
 188             index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
 189             i += ctx->cid_table->run[index2];
 190         }
 191
 192         if (i > 63) {
 193             av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
 194             return;
 195         }
 196
 197         j = ctx->scantable.permutated[i];
 198         //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
 199         //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
 200         level = (2*level+1) * qscale * weigth_matrix[i];
 201         if (ctx->cid_table->bit_depth == 10) {
 202             if (weigth_matrix[i] != 8)
 203                 level += 8;
 204             level >>= 4;
 205         } else {
 206             if (weigth_matrix[i] != 32)
 207                 level += 32;
 208             level >>= 6;
 209         }
 210         //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
 211         block[j] = (level^sign) - sign;
 212     }
 213 }
 214
 215 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
 216 {
 217     int dct_linesize_luma   = ctx->picture.linesize[0];
 218     int dct_linesize_chroma = ctx->picture.linesize[1];
 219     uint8_t *dest_y, *dest_u, *dest_v;
 220     int dct_offset;
 221     int qscale, i;
 222
 223     ctx->dsp.clear_blocks(ctx->blocks[0]);
 224     ctx->dsp.clear_blocks(ctx->blocks[2]); // FIXME change clear blocks to take block amount
 225
 226     qscale = get_bits(&ctx->gb, 11);
 227     skip_bits1(&ctx->gb);
 228     //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale);
 229
 230     for (i = 0; i < 8; i++) {
 231         dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
 232     }
 233
 234     if (ctx->picture.interlaced_frame) {
 235         dct_linesize_luma   <<= 1;
 236         dct_linesize_chroma <<= 1;
 237     }
 238
 239     dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma)   << 4) + (x << 4);
 240     dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3);
 241     dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3);
 242
 243     if (ctx->cur_field) {
 244         dest_y += ctx->picture.linesize[0];
 245         dest_u += ctx->picture.linesize[1];
 246         dest_v += ctx->picture.linesize[2];
 247     }
 248
 249     dct_offset = dct_linesize_luma << 3;
 250     ctx->dsp.idct_put(dest_y,                  dct_linesize_luma, ctx->blocks[0]);
 251     ctx->dsp.idct_put(dest_y + 8,              dct_linesize_luma, ctx->blocks[1]);
 252     ctx->dsp.idct_put(dest_y + dct_offset,     dct_linesize_luma, ctx->blocks[4]);
 253     ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]);
 254
 255     if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) {
 256         dct_offset = dct_linesize_chroma << 3;
 257         ctx->dsp.idct_put(dest_u,              dct_linesize_chroma, ctx->blocks[2]);
 258         ctx->dsp.idct_put(dest_v,              dct_linesize_chroma, ctx->blocks[3]);
 259         ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]);
 260         ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]);
 261     }
 262
 263     return 0;
 264 }
 265
 266 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, uint8_t *buf, int buf_size)
 267 {
 268     int x, y;
 269     for (y = 0; y < ctx->mb_height; y++) {
 270         ctx->last_dc[0] =
 271         ctx->last_dc[1] =
 272         ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1)
 273         init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3);
 274         for (x = 0; x < ctx->mb_width; x++) {
 275             //START_TIMER;
 276             dnxhd_decode_macroblock(ctx, x, y);
 277             //STOP_TIMER("decode macroblock");
 278         }
 279     }
 280     return 0;
 281 }
 282
 283 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
 284                               uint8_t *buf, int buf_size)
 285 {
 286     DNXHDContext *ctx = avctx->priv_data;
 287     AVFrame *picture = data;
 288     int first_field = 1;
 289
 290     dprintf(avctx, "frame size %d\n", buf_size);
 291
 292  decode_coding_unit:
 293     if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0)
 294         return -1;
 295
 296     avctx->pix_fmt = PIX_FMT_YUV422P;
 297     if (avcodec_check_dimensions(avctx, ctx->width, ctx->height))
 298         return -1;
 299     avcodec_set_dimensions(avctx, ctx->width, ctx->height);
 300
 301     if (first_field) {
 302         if (ctx->picture.data[0])
 303             avctx->release_buffer(avctx, &ctx->picture);
 304         if (avctx->get_buffer(avctx, &ctx->picture) < 0) {
 305             av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 306             return -1;
 307         }
 308     }
 309
 310     dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280);
 311
 312     if (first_field && ctx->picture.interlaced_frame) {
 313         buf      += ctx->cid_table->coding_unit_size;
 314         buf_size -= ctx->cid_table->coding_unit_size;
 315         first_field = 0;
 316         goto decode_coding_unit;
 317     }
 318
 319     *picture = ctx->picture;
 320     *data_size = sizeof(AVPicture);
 321     return buf_size;
 322 }
 323
 324 static int dnxhd_decode_close(AVCodecContext *avctx)
 325 {
 326     DNXHDContext *ctx = avctx->priv_data;
 327
 328     if (ctx->picture.data[0])
 329         avctx->release_buffer(avctx, &ctx->picture);
 330     free_vlc(&ctx->ac_vlc);
 331     free_vlc(&ctx->dc_vlc);
 332     free_vlc(&ctx->run_vlc);
 333     return 0;
 334 }
 335
 336 AVCodec dnxhd_decoder = {
 337     "dnxhd",
 338     CODEC_TYPE_VIDEO,
 339     CODEC_ID_DNXHD,
 340     sizeof(DNXHDContext),
 341     dnxhd_decode_init,
 342     NULL,
 343     dnxhd_decode_close,
 344     dnxhd_decode_frame,
 345     CODEC_CAP_DR1,
 346 };