Libav 0.7.1
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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 Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 "libavutil/imgutils.h" 00026 #include "avcodec.h" 00027 #include "get_bits.h" 00028 #include "dnxhddata.h" 00029 #include "dsputil.h" 00030 00031 typedef struct { 00032 AVCodecContext *avctx; 00033 AVFrame picture; 00034 GetBitContext gb; 00035 int cid; 00036 unsigned int width, height; 00037 unsigned int mb_width, mb_height; 00038 uint32_t mb_scan_index[68]; /* max for 1080p */ 00039 int cur_field; 00040 VLC ac_vlc, dc_vlc, run_vlc; 00041 int last_dc[3]; 00042 DSPContext dsp; 00043 DECLARE_ALIGNED(16, DCTELEM, blocks)[8][64]; 00044 ScanTable scantable; 00045 const CIDEntry *cid_table; 00046 } DNXHDContext; 00047 00048 #define DNXHD_VLC_BITS 9 00049 #define DNXHD_DC_VLC_BITS 7 00050 00051 static av_cold int dnxhd_decode_init(AVCodecContext *avctx) 00052 { 00053 DNXHDContext *ctx = avctx->priv_data; 00054 00055 ctx->avctx = avctx; 00056 dsputil_init(&ctx->dsp, avctx); 00057 avctx->coded_frame = &ctx->picture; 00058 ctx->picture.type = AV_PICTURE_TYPE_I; 00059 ctx->picture.key_frame = 1; 00060 return 0; 00061 } 00062 00063 static int dnxhd_init_vlc(DNXHDContext *ctx, int cid) 00064 { 00065 if (!ctx->cid_table) { 00066 int index; 00067 00068 if ((index = ff_dnxhd_get_cid_table(cid)) < 0) { 00069 av_log(ctx->avctx, AV_LOG_ERROR, "unsupported cid %d\n", cid); 00070 return -1; 00071 } 00072 ctx->cid_table = &ff_dnxhd_cid_table[index]; 00073 init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257, 00074 ctx->cid_table->ac_bits, 1, 1, 00075 ctx->cid_table->ac_codes, 2, 2, 0); 00076 init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, ctx->cid_table->bit_depth+4, 00077 ctx->cid_table->dc_bits, 1, 1, 00078 ctx->cid_table->dc_codes, 1, 1, 0); 00079 init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62, 00080 ctx->cid_table->run_bits, 1, 1, 00081 ctx->cid_table->run_codes, 2, 2, 0); 00082 00083 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct); 00084 } 00085 return 0; 00086 } 00087 00088 static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field) 00089 { 00090 static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 }; 00091 int i; 00092 00093 if (buf_size < 0x280) 00094 return -1; 00095 00096 if (memcmp(buf, header_prefix, 5)) { 00097 av_log(ctx->avctx, AV_LOG_ERROR, "error in header\n"); 00098 return -1; 00099 } 00100 if (buf[5] & 2) { /* interlaced */ 00101 ctx->cur_field = buf[5] & 1; 00102 ctx->picture.interlaced_frame = 1; 00103 ctx->picture.top_field_first = first_field ^ ctx->cur_field; 00104 av_log(ctx->avctx, AV_LOG_DEBUG, "interlaced %d, cur field %d\n", buf[5] & 3, ctx->cur_field); 00105 } 00106 00107 ctx->height = AV_RB16(buf + 0x18); 00108 ctx->width = AV_RB16(buf + 0x1a); 00109 00110 av_dlog(ctx->avctx, "width %d, heigth %d\n", ctx->width, ctx->height); 00111 00112 if (buf[0x21] & 0x40) { 00113 av_log(ctx->avctx, AV_LOG_ERROR, "10 bit per component\n"); 00114 return -1; 00115 } 00116 00117 ctx->cid = AV_RB32(buf + 0x28); 00118 av_dlog(ctx->avctx, "compression id %d\n", ctx->cid); 00119 00120 if (dnxhd_init_vlc(ctx, ctx->cid) < 0) 00121 return -1; 00122 00123 if (buf_size < ctx->cid_table->coding_unit_size) { 00124 av_log(ctx->avctx, AV_LOG_ERROR, "incorrect frame size\n"); 00125 return -1; 00126 } 00127 00128 ctx->mb_width = ctx->width>>4; 00129 ctx->mb_height = buf[0x16d]; 00130 00131 av_dlog(ctx->avctx, "mb width %d, mb height %d\n", ctx->mb_width, ctx->mb_height); 00132 00133 if ((ctx->height+15)>>4 == ctx->mb_height && ctx->picture.interlaced_frame) 00134 ctx->height <<= 1; 00135 00136 if (ctx->mb_height > 68 || 00137 (ctx->mb_height<<ctx->picture.interlaced_frame) > (ctx->height+15)>>4) { 00138 av_log(ctx->avctx, AV_LOG_ERROR, "mb height too big: %d\n", ctx->mb_height); 00139 return -1; 00140 } 00141 00142 for (i = 0; i < ctx->mb_height; i++) { 00143 ctx->mb_scan_index[i] = AV_RB32(buf + 0x170 + (i<<2)); 00144 av_dlog(ctx->avctx, "mb scan index %d\n", ctx->mb_scan_index[i]); 00145 if (buf_size < ctx->mb_scan_index[i] + 0x280) { 00146 av_log(ctx->avctx, AV_LOG_ERROR, "invalid mb scan index\n"); 00147 return -1; 00148 } 00149 } 00150 00151 return 0; 00152 } 00153 00154 static int dnxhd_decode_dc(DNXHDContext *ctx) 00155 { 00156 int len; 00157 00158 len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1); 00159 return len ? get_xbits(&ctx->gb, len) : 0; 00160 } 00161 00162 static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale) 00163 { 00164 int i, j, index, index2; 00165 int level, component, sign; 00166 const uint8_t *weigth_matrix; 00167 00168 if (n&2) { 00169 component = 1 + (n&1); 00170 weigth_matrix = ctx->cid_table->chroma_weight; 00171 } else { 00172 component = 0; 00173 weigth_matrix = ctx->cid_table->luma_weight; 00174 } 00175 00176 ctx->last_dc[component] += dnxhd_decode_dc(ctx); 00177 block[0] = ctx->last_dc[component]; 00178 //av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]); 00179 for (i = 1; ; i++) { 00180 index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2); 00181 //av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index); 00182 level = ctx->cid_table->ac_level[index]; 00183 if (!level) { /* EOB */ 00184 //av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n"); 00185 return; 00186 } 00187 sign = get_sbits(&ctx->gb, 1); 00188 00189 if (ctx->cid_table->ac_index_flag[index]) { 00190 level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6; 00191 } 00192 00193 if (ctx->cid_table->ac_run_flag[index]) { 00194 index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2); 00195 i += ctx->cid_table->run[index2]; 00196 } 00197 00198 if (i > 63) { 00199 av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i); 00200 return; 00201 } 00202 00203 j = ctx->scantable.permutated[i]; 00204 //av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j); 00205 //av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]); 00206 level = (2*level+1) * qscale * weigth_matrix[i]; 00207 if (ctx->cid_table->bit_depth == 10) { 00208 if (weigth_matrix[i] != 8) 00209 level += 8; 00210 level >>= 4; 00211 } else { 00212 if (weigth_matrix[i] != 32) 00213 level += 32; 00214 level >>= 6; 00215 } 00216 //av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level); 00217 block[j] = (level^sign) - sign; 00218 } 00219 } 00220 00221 static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y) 00222 { 00223 int dct_linesize_luma = ctx->picture.linesize[0]; 00224 int dct_linesize_chroma = ctx->picture.linesize[1]; 00225 uint8_t *dest_y, *dest_u, *dest_v; 00226 int dct_offset; 00227 int qscale, i; 00228 00229 qscale = get_bits(&ctx->gb, 11); 00230 skip_bits1(&ctx->gb); 00231 //av_log(ctx->avctx, AV_LOG_DEBUG, "qscale %d\n", qscale); 00232 00233 for (i = 0; i < 8; i++) { 00234 ctx->dsp.clear_block(ctx->blocks[i]); 00235 dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale); 00236 } 00237 00238 if (ctx->picture.interlaced_frame) { 00239 dct_linesize_luma <<= 1; 00240 dct_linesize_chroma <<= 1; 00241 } 00242 00243 dest_y = ctx->picture.data[0] + ((y * dct_linesize_luma) << 4) + (x << 4); 00244 dest_u = ctx->picture.data[1] + ((y * dct_linesize_chroma) << 4) + (x << 3); 00245 dest_v = ctx->picture.data[2] + ((y * dct_linesize_chroma) << 4) + (x << 3); 00246 00247 if (ctx->cur_field) { 00248 dest_y += ctx->picture.linesize[0]; 00249 dest_u += ctx->picture.linesize[1]; 00250 dest_v += ctx->picture.linesize[2]; 00251 } 00252 00253 dct_offset = dct_linesize_luma << 3; 00254 ctx->dsp.idct_put(dest_y, dct_linesize_luma, ctx->blocks[0]); 00255 ctx->dsp.idct_put(dest_y + 8, dct_linesize_luma, ctx->blocks[1]); 00256 ctx->dsp.idct_put(dest_y + dct_offset, dct_linesize_luma, ctx->blocks[4]); 00257 ctx->dsp.idct_put(dest_y + dct_offset + 8, dct_linesize_luma, ctx->blocks[5]); 00258 00259 if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) { 00260 dct_offset = dct_linesize_chroma << 3; 00261 ctx->dsp.idct_put(dest_u, dct_linesize_chroma, ctx->blocks[2]); 00262 ctx->dsp.idct_put(dest_v, dct_linesize_chroma, ctx->blocks[3]); 00263 ctx->dsp.idct_put(dest_u + dct_offset, dct_linesize_chroma, ctx->blocks[6]); 00264 ctx->dsp.idct_put(dest_v + dct_offset, dct_linesize_chroma, ctx->blocks[7]); 00265 } 00266 00267 return 0; 00268 } 00269 00270 static int dnxhd_decode_macroblocks(DNXHDContext *ctx, const uint8_t *buf, int buf_size) 00271 { 00272 int x, y; 00273 for (y = 0; y < ctx->mb_height; y++) { 00274 ctx->last_dc[0] = 00275 ctx->last_dc[1] = 00276 ctx->last_dc[2] = 1<<(ctx->cid_table->bit_depth+2); // for levels +2^(bitdepth-1) 00277 init_get_bits(&ctx->gb, buf + ctx->mb_scan_index[y], (buf_size - ctx->mb_scan_index[y]) << 3); 00278 for (x = 0; x < ctx->mb_width; x++) { 00279 //START_TIMER; 00280 dnxhd_decode_macroblock(ctx, x, y); 00281 //STOP_TIMER("decode macroblock"); 00282 } 00283 } 00284 return 0; 00285 } 00286 00287 static int dnxhd_decode_frame(AVCodecContext *avctx, void *data, int *data_size, 00288 AVPacket *avpkt) 00289 { 00290 const uint8_t *buf = avpkt->data; 00291 int buf_size = avpkt->size; 00292 DNXHDContext *ctx = avctx->priv_data; 00293 AVFrame *picture = data; 00294 int first_field = 1; 00295 00296 av_dlog(avctx, "frame size %d\n", buf_size); 00297 00298 decode_coding_unit: 00299 if (dnxhd_decode_header(ctx, buf, buf_size, first_field) < 0) 00300 return -1; 00301 00302 if ((avctx->width || avctx->height) && 00303 (ctx->width != avctx->width || ctx->height != avctx->height)) { 00304 av_log(avctx, AV_LOG_WARNING, "frame size changed: %dx%d -> %dx%d\n", 00305 avctx->width, avctx->height, ctx->width, ctx->height); 00306 first_field = 1; 00307 } 00308 00309 avctx->pix_fmt = PIX_FMT_YUV422P; 00310 if (av_image_check_size(ctx->width, ctx->height, 0, avctx)) 00311 return -1; 00312 avcodec_set_dimensions(avctx, ctx->width, ctx->height); 00313 00314 if (first_field) { 00315 if (ctx->picture.data[0]) 00316 avctx->release_buffer(avctx, &ctx->picture); 00317 if (avctx->get_buffer(avctx, &ctx->picture) < 0) { 00318 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 00319 return -1; 00320 } 00321 } 00322 00323 dnxhd_decode_macroblocks(ctx, buf + 0x280, buf_size - 0x280); 00324 00325 if (first_field && ctx->picture.interlaced_frame) { 00326 buf += ctx->cid_table->coding_unit_size; 00327 buf_size -= ctx->cid_table->coding_unit_size; 00328 first_field = 0; 00329 goto decode_coding_unit; 00330 } 00331 00332 *picture = ctx->picture; 00333 *data_size = sizeof(AVPicture); 00334 return buf_size; 00335 } 00336 00337 static av_cold int dnxhd_decode_close(AVCodecContext *avctx) 00338 { 00339 DNXHDContext *ctx = avctx->priv_data; 00340 00341 if (ctx->picture.data[0]) 00342 avctx->release_buffer(avctx, &ctx->picture); 00343 free_vlc(&ctx->ac_vlc); 00344 free_vlc(&ctx->dc_vlc); 00345 free_vlc(&ctx->run_vlc); 00346 return 0; 00347 } 00348 00349 AVCodec ff_dnxhd_decoder = { 00350 "dnxhd", 00351 AVMEDIA_TYPE_VIDEO, 00352 CODEC_ID_DNXHD, 00353 sizeof(DNXHDContext), 00354 dnxhd_decode_init, 00355 NULL, 00356 dnxhd_decode_close, 00357 dnxhd_decode_frame, 00358 CODEC_CAP_DR1, 00359 .long_name = NULL_IF_CONFIG_SMALL("VC3/DNxHD"), 00360 };