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 "get_bits.h" 27#include "dnxhddata.h" 28#include "dsputil.h" 29 30typedef struct { 31 AVCodecContext *avctx; 32 AVFrame picture; 33 GetBitContext gb; 34 int cid; ///< compression id 35 unsigned int width, height; 36 unsigned int mb_width, mb_height; 37 uint32_t mb_scan_index[68]; /* max for 1080p */ 38 int cur_field; ///< current interlaced field 39 VLC ac_vlc, dc_vlc, run_vlc; 40 int last_dc[3]; 41 DSPContext dsp; 42 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64]; 43 ScanTable scantable; 44 const CIDEntry *cid_table; 45} DNXHDContext; 46 47#define DNXHD_VLC_BITS 9 48#define DNXHD_DC_VLC_BITS 7 49 50static av_cold int dnxhd_decode_init(AVCodecContext *avctx) 51{ 52 DNXHDContext *ctx = avctx->priv_data; 53 54 ctx->avctx = avctx; 55 dsputil_init(&ctx->dsp, avctx); 56 avctx->coded_frame = &ctx->picture; 57 ctx->picture.type = FF_I_TYPE; 58 return 0; 59} 60 61static int dnxhd_init_vlc(DNXHDContext *ctx, int cid) 62{ 63 if (!ctx->cid_table) { 64 int index; 65 66 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) { 67 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid); 68 return -1; 69 } 70 ctx->cid_table = &ff_dnxhd_cid_table[index]; 71 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257, 72 ctx->cid_table->ac_bits, 1, 1, 73 ctx->cid_table->ac_codes, 2, 2, 0); 74 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4, 75 ctx->cid_table->dc_bits, 1, 1, 76 ctx->cid_table->dc_codes, 1, 1, 0); 77 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62, 78 ctx->cid_table->run_bits, 1, 1, 79 ctx->cid_table->run_codes, 2, 2, 0); 80 81 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct); 82 } 83 return 0; 84} 85 86static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field) 87{ 88 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 }; 89 int i; 90 91 if (buf_size < 0x280) 92 return -1; 93 94 if (memcmp(buf, header_prefix, 5)) { 95 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n"); 96 return -1; 97 } 98 if (buf[5] & 2) { /* interlaced */ 99 ctx->cur_field = buf[5] & 1; 100 ctx->picture.interlaced_frame = 1; 101 ctx->picture.top_field_first = first_field ^ ctx->cur_field; 102 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field); 103 } 104 105 ctx->height = AV_RB16(buf + 0x18); 106 ctx->width = AV_RB16(buf + 0x1a); 107 108 dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height); 109 110 if (buf[0x21] & 0x40) { 111 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n"); 112 return -1; 113 } 114 115 ctx->cid = AV_RB32(buf + 0x28); 116 dprintf(ctx->avctx, "compression id %d\n", ctx->cid); 117 118 if (dnxhd_init_vlc(ctx, ctx->cid) < 0) 119 return -1; 120 121 if (buf_size < ctx->cid_table->coding_unit_size) { 122 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n"); 123 return -1; 124 } 125 126 ctx->mb_width = ctx->width>>4; 127 ctx->mb_height = buf[0x16d]; 128 129 dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height); 130 131 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame) 132 ctx->height <<= 1; 133 134 if (ctx->mb_height > 68 || 135 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) { 136 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height); 137 return -1; 138 } 139 140 for (i = 0; i < ctx->mb_height; i++) { 141 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2)); 142 dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]); 143 if (buf_size < ctx->mb_scan_index[i] + 0x280) { 144 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n"); 145 return -1; 146 } 147 } 148 149 return 0; 150} 151 152static int dnxhd_decode_dc(DNXHDContext *ctx) 153{ 154 int len; 155 156 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1); 157 return len ? get_xbits(&ctx->gb, len) : 0; 158} 159 160static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale) 161{ 162 int i, j, index, index2; 163 int level, component, sign; 164 const uint8_t *weigth_matrix; 165 166 if (n&2) { 167 component = 1 + (n&1); 168 weigth_matrix = ctx->cid_table->chroma_weight; 169 } else { 170 component = 0; 171 weigth_matrix = ctx->cid_table->luma_weight; 172 } 173 174 ctx->last_dc[component] += dnxhd_decode_dc(ctx); 175 block[0] = ctx->last_dc[component]; 176 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]); 177 for (i = 1; ; i++) { 178 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2); 179 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index); 180 level = ctx->cid_table->ac_level[index]; 181 if (!level) { /* EOB */ 182 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n"); 183 return; 184 } 185 sign = get_sbits(&ctx->gb, 1); 186 187 if (ctx->cid_table->ac_index_flag[index]) { 188 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6; 189 } 190 191 if (ctx->cid_table->ac_run_flag[index]) { 192 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2); 193 i += ctx->cid_table->run[index2]; 194 } 195 196 if (i > 63) { 197 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i); 198 return; 199 } 200 201 j = ctx->scantable.permutated[i]; 202 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j); 203 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]); 204 level = (2*level+1) * qscale * weigth_matrix[i]; 205 if (ctx->cid_table->bit_depth == 10) { 206 if (weigth_matrix[i] != 8) 207 level += 8; 208 level >>= 4; 209 } else { 210 if (weigth_matrix[i] != 32) 211 level += 32; 212 level >>= 6; 213 } 214 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level); 215 block[j] = (level^sign) - sign; 216 } 217} 218 219static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y) 220{ 221 int dct_linesize_luma = ctx->picture.linesize[0]; 222 int dct_linesize_chroma = ctx->picture.linesize[1]; 223 uint8_t *dest_y, *dest_u, *dest_v; 224 int dct_offset; 225 int qscale, i; 226 227 qscale = get_bits(&ctx->gb, 11); 228 skip_bits1(&ctx->gb); 229 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale); 230 231 for (i = 0; i < 8; i++) { 232 ctx->dsp.clear_block(ctx->blocks[i]); 233 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale); 234 } 235 236 if (ctx->picture.interlaced_frame) { 237 dct_linesize_luma <<= 1; 238 dct_linesize_chroma <<= 1; 239 } 240 241 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4); 242 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3); 243 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3); 244 245 if (ctx->cur_field) { 246 dest_y += ctx->picture.linesize[0]; 247 dest_u += ctx->picture.linesize[1]; 248 dest_v += ctx->picture.linesize[2]; 249 } 250 251 dct_offset = dct_linesize_luma << 3; 252 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]); 253 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]); 254 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]); 255 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]); 256 257 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) { 258 dct_offset = dct_linesize_chroma << 3; 259 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]); 260 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]); 261 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]); 262 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]); 263 } 264 265 return 0; 266} 267 268static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size) 269{ 270 int x, y; 271 for (y = 0; y < ctx->mb_height; y++) { 272 ctx->last_dc[0] = 273 ctx->last_dc[1] = 274 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1) 275 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3); 276 for (x = 0; x < ctx->mb_width; x++) { 277 //START_TIMER; 278 dnxhd_decode_macroblock(ctx, x, y); 279 //STOP_TIMER("decode macroblock"); 280 } 281 } 282 return 0; 283} 284 285static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size, 286 AVPacket *avpkt) 287{ 288 const uint8_t *buf = avpkt->data; 289 int buf_size = avpkt->size; 290 DNXHDContext *ctx = avctx->priv_data; 291 AVFrame *picture = data; 292 int first_field = 1; 293 294 dprintf(avctx, "frame size %d\n", buf_size); 295 296 decode_coding_unit: 297 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0) 298 return -1; 299 300 if ((avctx->width || avctx->height) && 301 (ctx->width != avctx->width || ctx->height != avctx->height)) { 302 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n", 303 avctx->width, avctx->height, ctx->width, ctx->height); 304 first_field = 1; 305 } 306 307 avctx->pix_fmt = PIX_FMT_YUV422P; 308 if (avcodec_check_dimensions(avctx, ctx->width, ctx->height)) 309 return -1; 310 avcodec_set_dimensions(avctx, ctx->width, ctx->height); 311 312 if (first_field) { 313 if (ctx->picture.data[0]) 314 avctx->release_buffer(avctx, &ctx->picture); 315 if (avctx->get_buffer(avctx, &ctx->picture) < 0) { 316 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 317 return -1; 318 } 319 } 320 321 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280); 322 323 if (first_field && ctx->picture.interlaced_frame) { 324 buf += ctx->cid_table->coding_unit_size; 325 buf_size -= ctx->cid_table->coding_unit_size; 326 first_field = 0; 327 goto decode_coding_unit; 328 } 329 330 *picture = ctx->picture; 331 *data_size = sizeof(AVPicture); 332 return buf_size; 333} 334 335static av_cold int dnxhd_decode_close(AVCodecContext *avctx) 336{ 337 DNXHDContext *ctx = avctx->priv_data; 338 339 if (ctx->picture.data[0]) 340 avctx->release_buffer(avctx, &ctx->picture); 341 free_vlc(&ctx->ac_vlc); 342 free_vlc(&ctx->dc_vlc); 343 free_vlc(&ctx->run_vlc); 344 return 0; 345} 346 347AVCodec dnxhd_decoder = { 348 "dnxhd", 349 AVMEDIA_TYPE_VIDEO, 350 CODEC_ID_DNXHD, 351 sizeof(DNXHDContext), 352 dnxhd_decode_init, 353 NULL, 354 dnxhd_decode_close, 355 dnxhd_decode_frame, 356 CODEC_CAP_DR1, 357 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"), 358}; 359