Libav
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00001 /* 00002 * VC3/DNxHD decoder. 00003 * Copyright (c) 2007 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 //#define TRACE 00023 //#define DEBUG 00024 00025 #include "avcodec.h" 00026 #include "get_bits.h" 00027 #include "dnxhddata.h" 00028 #include "dsputil.h" 00029 00030 typedef struct { 00031 AVCodecContext *avctx; 00032 AVFrame picture; 00033 GetBitContext gb; 00034 int cid; 00035 unsigned int width, height; 00036 unsigned int mb_width, mb_height; 00037 uint32_t mb_scan_index[68]; /* max for 1080p */ 00038 int cur_field; 00039 VLC ac_vlc, dc_vlc, run_vlc; 00040 int last_dc[3]; 00041 DSPContext dsp; 00042 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64]; 00043 ScanTable scantable; 00044 const CIDEntry *cid_table; 00045 } DNXHDContext; 00046 00047 #define DNXHD_VLC_BITS 9 00048 #define DNXHD_DC_VLC_BITS 7 00049 00050 static av_cold int dnxhd_decode_init(AVCodecContext *avctx) 00051 { 00052 DNXHDContext *ctx = avctx->priv_data; 00053 00054 ctx->avctx = avctx; 00055 dsputil_init(&ctx->dsp, avctx); 00056 avctx->coded_frame = &ctx->picture; 00057 ctx->picture.type = FF_I_TYPE; 00058 return 0; 00059 } 00060 00061 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid) 00062 { 00063 if (!ctx->cid_table) { 00064 int index; 00065 00066 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) { 00067 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid); 00068 return -1; 00069 } 00070 ctx->cid_table = &ff_dnxhd_cid_table[index]; 00071 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257, 00072 ctx->cid_table->ac_bits, 1, 1, 00073 ctx->cid_table->ac_codes, 2, 2, 0); 00074 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4, 00075 ctx->cid_table->dc_bits, 1, 1, 00076 ctx->cid_table->dc_codes, 1, 1, 0); 00077 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62, 00078 ctx->cid_table->run_bits, 1, 1, 00079 ctx->cid_table->run_codes, 2, 2, 0); 00080 00081 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct); 00082 } 00083 return 0; 00084 } 00085 00086 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field) 00087 { 00088 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 }; 00089 int i; 00090 00091 if (buf_size < 0x280) 00092 return -1; 00093 00094 if (memcmp(buf, header_prefix, 5)) { 00095 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n"); 00096 return -1; 00097 } 00098 if (buf[5] & 2) { /* interlaced */ 00099 ctx->cur_field = buf[5] & 1; 00100 ctx->picture.interlaced_frame = 1; 00101 ctx->picture.top_field_first = first_field ^ ctx->cur_field; 00102 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field); 00103 } 00104 00105 ctx->height = AV_RB16(buf + 0x18); 00106 ctx->width = AV_RB16(buf + 0x1a); 00107 00108 dprintf(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height); 00109 00110 if (buf[0x21] & 0x40) { 00111 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n"); 00112 return -1; 00113 } 00114 00115 ctx->cid = AV_RB32(buf + 0x28); 00116 dprintf(ctx->avctx, "compression id %d\n", ctx->cid); 00117 00118 if (dnxhd_init_vlc(ctx, ctx->cid) < 0) 00119 return -1; 00120 00121 if (buf_size < ctx->cid_table->coding_unit_size) { 00122 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n"); 00123 return -1; 00124 } 00125 00126 ctx->mb_width = ctx->width>>4; 00127 ctx->mb_height = buf[0x16d]; 00128 00129 dprintf(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height); 00130 00131 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame) 00132 ctx->height <<= 1; 00133 00134 if (ctx->mb_height > 68 || 00135 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) { 00136 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height); 00137 return -1; 00138 } 00139 00140 for (i = 0; i < ctx->mb_height; i++) { 00141 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2)); 00142 dprintf(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]); 00143 if (buf_size < ctx->mb_scan_index[i] + 0x280) { 00144 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n"); 00145 return -1; 00146 } 00147 } 00148 00149 return 0; 00150 } 00151 00152 static int dnxhd_decode_dc(DNXHDContext *ctx) 00153 { 00154 int len; 00155 00156 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1); 00157 return len ? get_xbits(&ctx->gb, len) : 0; 00158 } 00159 00160 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale) 00161 { 00162 int i, j, index, index2; 00163 int level, component, sign; 00164 const uint8_t *weigth_matrix; 00165 00166 if (n&2) { 00167 component = 1 + (n&1); 00168 weigth_matrix = ctx->cid_table->chroma_weight; 00169 } else { 00170 component = 0; 00171 weigth_matrix = ctx->cid_table->luma_weight; 00172 } 00173 00174 ctx->last_dc[component] += dnxhd_decode_dc(ctx); 00175 block[0] = ctx->last_dc[component]; 00176 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]); 00177 for (i = 1; ; i++) { 00178 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2); 00179 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index); 00180 level = ctx->cid_table->ac_level[index]; 00181 if (!level) { /* EOB */ 00182 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n"); 00183 return; 00184 } 00185 sign = get_sbits(&ctx->gb, 1); 00186 00187 if (ctx->cid_table->ac_index_flag[index]) { 00188 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6; 00189 } 00190 00191 if (ctx->cid_table->ac_run_flag[index]) { 00192 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2); 00193 i += ctx->cid_table->run[index2]; 00194 } 00195 00196 if (i > 63) { 00197 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i); 00198 return; 00199 } 00200 00201 j = ctx->scantable.permutated[i]; 00202 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j); 00203 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]); 00204 level = (2*level+1) * qscale * weigth_matrix[i]; 00205 if (ctx->cid_table->bit_depth == 10) { 00206 if (weigth_matrix[i] != 8) 00207 level += 8; 00208 level >>= 4; 00209 } else { 00210 if (weigth_matrix[i] != 32) 00211 level += 32; 00212 level >>= 6; 00213 } 00214 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level); 00215 block[j] = (level^sign) - sign; 00216 } 00217 } 00218 00219 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y) 00220 { 00221 int dct_linesize_luma = ctx->picture.linesize[0]; 00222 int dct_linesize_chroma = ctx->picture.linesize[1]; 00223 uint8_t *dest_y, *dest_u, *dest_v; 00224 int dct_offset; 00225 int qscale, i; 00226 00227 qscale = get_bits(&ctx->gb, 11); 00228 skip_bits1(&ctx->gb); 00229 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale); 00230 00231 for (i = 0; i < 8; i++) { 00232 ctx->dsp.clear_block(ctx->blocks[i]); 00233 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale); 00234 } 00235 00236 if (ctx->picture.interlaced_frame) { 00237 dct_linesize_luma <<= 1; 00238 dct_linesize_chroma <<= 1; 00239 } 00240 00241 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4); 00242 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3); 00243 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3); 00244 00245 if (ctx->cur_field) { 00246 dest_y += ctx->picture.linesize[0]; 00247 dest_u += ctx->picture.linesize[1]; 00248 dest_v += ctx->picture.linesize[2]; 00249 } 00250 00251 dct_offset = dct_linesize_luma << 3; 00252 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]); 00253 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]); 00254 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]); 00255 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]); 00256 00257 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) { 00258 dct_offset = dct_linesize_chroma << 3; 00259 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]); 00260 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]); 00261 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]); 00262 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]); 00263 } 00264 00265 return 0; 00266 } 00267 00268 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size) 00269 { 00270 int x, y; 00271 for (y = 0; y < ctx->mb_height; y++) { 00272 ctx->last_dc[0] = 00273 ctx->last_dc[1] = 00274 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1) 00275 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3); 00276 for (x = 0; x < ctx->mb_width; x++) { 00277 //START_TIMER; 00278 dnxhd_decode_macroblock(ctx, x, y); 00279 //STOP_TIMER("decode macroblock"); 00280 } 00281 } 00282 return 0; 00283 } 00284 00285 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size, 00286 AVPacket *avpkt) 00287 { 00288 const uint8_t *buf = avpkt->data; 00289 int buf_size = avpkt->size; 00290 DNXHDContext *ctx = avctx->priv_data; 00291 AVFrame *picture = data; 00292 int first_field = 1; 00293 00294 dprintf(avctx, "frame size %d\n", buf_size); 00295 00296 decode_coding_unit: 00297 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0) 00298 return -1; 00299 00300 if ((avctx->width || avctx->height) && 00301 (ctx->width != avctx->width || ctx->height != avctx->height)) { 00302 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n", 00303 avctx->width, avctx->height, ctx->width, ctx->height); 00304 first_field = 1; 00305 } 00306 00307 avctx->pix_fmt = PIX_FMT_YUV422P; 00308 if (avcodec_check_dimensions(avctx, ctx->width, ctx->height)) 00309 return -1; 00310 avcodec_set_dimensions(avctx, ctx->width, ctx->height); 00311 00312 if (first_field) { 00313 if (ctx->picture.data[0]) 00314 avctx->release_buffer(avctx, &ctx->picture); 00315 if (avctx->get_buffer(avctx, &ctx->picture) < 0) { 00316 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 00317 return -1; 00318 } 00319 } 00320 00321 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280); 00322 00323 if (first_field && ctx->picture.interlaced_frame) { 00324 buf += ctx->cid_table->coding_unit_size; 00325 buf_size -= ctx->cid_table->coding_unit_size; 00326 first_field = 0; 00327 goto decode_coding_unit; 00328 } 00329 00330 *picture = ctx->picture; 00331 *data_size = sizeof(AVPicture); 00332 return buf_size; 00333 } 00334 00335 static av_cold int dnxhd_decode_close(AVCodecContext *avctx) 00336 { 00337 DNXHDContext *ctx = avctx->priv_data; 00338 00339 if (ctx->picture.data[0]) 00340 avctx->release_buffer(avctx, &ctx->picture); 00341 free_vlc(&ctx->ac_vlc); 00342 free_vlc(&ctx->dc_vlc); 00343 free_vlc(&ctx->run_vlc); 00344 return 0; 00345 } 00346 00347 AVCodec dnxhd_decoder = { 00348 "dnxhd", 00349 AVMEDIA_TYPE_VIDEO, 00350 CODEC_ID_DNXHD, 00351 sizeof(DNXHDContext), 00352 dnxhd_decode_init, 00353 NULL, 00354 dnxhd_decode_close, 00355 dnxhd_decode_frame, 00356 CODEC_CAP_DR1, 00357 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"), 00358 };