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