1/* 2 * Copyright (c) 2003 Michael Niedermayer 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * ASUS V1/V2 decoder. 24 */ 25 26#include "libavutil/attributes.h" 27#include "libavutil/mem.h" 28#include "libavutil/thread.h" 29 30#include "asv.h" 31#include "avcodec.h" 32#include "blockdsp.h" 33#include "codec_internal.h" 34#include "config_components.h" 35#include "idctdsp.h" 36#include "internal.h" 37#include "mpeg12data.h" 38 39#define CCP_VLC_BITS 5 40#define DC_CCP_VLC_BITS 4 41#define AC_CCP_VLC_BITS 6 42#define ASV1_LEVEL_VLC_BITS 4 43#define ASV2_LEVEL_VLC_BITS 10 44 45static VLC ccp_vlc; 46static VLC level_vlc; 47static VLC dc_ccp_vlc; 48static VLC ac_ccp_vlc; 49static VLC asv2_level_vlc; 50 51static av_cold void init_vlcs(void) 52{ 53 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17, 54 &ff_asv_ccp_tab[0][1], 2, 1, 55 &ff_asv_ccp_tab[0][0], 2, 1, 32); 56 INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8, 57 &ff_asv_dc_ccp_tab[0][1], 2, 1, 58 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16); 59 INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16, 60 &ff_asv_ac_ccp_tab[0][1], 2, 1, 61 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64); 62 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7, 63 &ff_asv_level_tab[0][1], 2, 1, 64 &ff_asv_level_tab[0][0], 2, 1, 16); 65 INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63, 66 &ff_asv2_level_tab[0][1], 4, 2, 67 &ff_asv2_level_tab[0][0], 4, 2, 1024); 68} 69 70static inline int asv1_get_level(GetBitContext *gb) 71{ 72 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1); 73 74 if (code == 3) 75 return get_sbits(gb, 8); 76 else 77 return code - 3; 78} 79 80// get_vlc2() is big-endian in this file 81static inline int asv2_get_vlc2(GetBitContext *gb, const VLCElem *table, int bits) 82{ 83 unsigned int index; 84 int code, n; 85 86 OPEN_READER(re, gb); 87 UPDATE_CACHE_LE(re, gb); 88 89 index = SHOW_UBITS_LE(re, gb, bits); 90 code = table[index].sym; 91 n = table[index].len; 92 LAST_SKIP_BITS(re, gb, n); 93 94 CLOSE_READER(re, gb); 95 96 return code; 97} 98 99static inline int asv2_get_level(GetBitContext *gb) 100{ 101 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS); 102 103 if (code == 31) 104 return (int8_t) get_bits_le(gb, 8); 105 else 106 return code - 31; 107} 108 109static inline int asv1_decode_block(ASV1Context *a, int16_t block[64]) 110{ 111 int i; 112 113 block[0] = 8 * get_bits(&a->gb, 8); 114 115 for (i = 0; i < 11; i++) { 116 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1); 117 118 if (ccp) { 119 if (ccp == 16) 120 break; 121 if (ccp < 0 || i >= 10) { 122 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n"); 123 return AVERROR_INVALIDDATA; 124 } 125 126 if (ccp & 8) 127 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4; 128 if (ccp & 4) 129 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4; 130 if (ccp & 2) 131 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4; 132 if (ccp & 1) 133 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4; 134 } 135 } 136 137 return 0; 138} 139 140static inline int asv2_decode_block(ASV1Context *a, int16_t block[64]) 141{ 142 int i, count, ccp; 143 144 count = get_bits_le(&a->gb, 4); 145 146 block[0] = 8 * get_bits_le(&a->gb, 8); 147 148 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS); 149 if (ccp) { 150 if (ccp & 4) 151 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4; 152 if (ccp & 2) 153 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4; 154 if (ccp & 1) 155 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4; 156 } 157 158 for (i = 1; i < count + 1; i++) { 159 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS); 160 161 if (ccp) { 162 if (ccp & 8) 163 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4; 164 if (ccp & 4) 165 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4; 166 if (ccp & 2) 167 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4; 168 if (ccp & 1) 169 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4; 170 } 171 } 172 173 return 0; 174} 175 176static inline int decode_mb(ASV1Context *a, int16_t block[6][64]) 177{ 178 int i, ret; 179 180 a->bdsp.clear_blocks(block[0]); 181 182 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) { 183 for (i = 0; i < 6; i++) { 184 if ((ret = asv1_decode_block(a, block[i])) < 0) 185 return ret; 186 } 187 } else { 188 for (i = 0; i < 6; i++) { 189 if ((ret = asv2_decode_block(a, block[i])) < 0) 190 return ret; 191 } 192 } 193 return 0; 194} 195 196static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y) 197{ 198 int16_t(*block)[64] = a->block; 199 int linesize = frame->linesize[0]; 200 201 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; 202 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; 203 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; 204 205 a->idsp.idct_put(dest_y, linesize, block[0]); 206 a->idsp.idct_put(dest_y + 8, linesize, block[1]); 207 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); 208 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); 209 210 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) { 211 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); 212 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); 213 } 214} 215 216static int decode_frame(AVCodecContext *avctx, AVFrame *p, 217 int *got_frame, AVPacket *avpkt) 218{ 219 ASV1Context *const a = avctx->priv_data; 220 const uint8_t *buf = avpkt->data; 221 int buf_size = avpkt->size; 222 int mb_x, mb_y, ret; 223 224 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL) 225 return AVERROR_INVALIDDATA; 226 227 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 228 return ret; 229 p->pict_type = AV_PICTURE_TYPE_I; 230 p->key_frame = 1; 231 232 if (avctx->codec_id == AV_CODEC_ID_ASV1) { 233 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, 234 buf_size); 235 if (!a->bitstream_buffer) 236 return AVERROR(ENOMEM); 237 238 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer, 239 (const uint32_t *) buf, buf_size / 4); 240 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size); 241 } else { 242 ret = init_get_bits8_le(&a->gb, buf, buf_size); 243 } 244 if (ret < 0) 245 return ret; 246 247 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) { 248 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) { 249 if ((ret = decode_mb(a, a->block)) < 0) 250 return ret; 251 252 idct_put(a, p, mb_x, mb_y); 253 } 254 } 255 256 if (a->mb_width2 != a->mb_width) { 257 mb_x = a->mb_width2; 258 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) { 259 if ((ret = decode_mb(a, a->block)) < 0) 260 return ret; 261 262 idct_put(a, p, mb_x, mb_y); 263 } 264 } 265 266 if (a->mb_height2 != a->mb_height) { 267 mb_y = a->mb_height2; 268 for (mb_x = 0; mb_x < a->mb_width; mb_x++) { 269 if ((ret = decode_mb(a, a->block)) < 0) 270 return ret; 271 272 idct_put(a, p, mb_x, mb_y); 273 } 274 } 275 276 *got_frame = 1; 277 278 emms_c(); 279 280 return (get_bits_count(&a->gb) + 31) / 32 * 4; 281} 282 283static av_cold int decode_init(AVCodecContext *avctx) 284{ 285 static AVOnce init_static_once = AV_ONCE_INIT; 286 ASV1Context *const a = avctx->priv_data; 287 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2; 288 int i; 289 290 if (avctx->extradata_size < 1) { 291 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n"); 292 } 293 294 ff_asv_common_init(avctx); 295 ff_blockdsp_init(&a->bdsp, avctx); 296 ff_idctdsp_init(&a->idsp, avctx); 297 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab); 298 avctx->pix_fmt = AV_PIX_FMT_YUV420P; 299 300 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) { 301 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n"); 302 if (avctx->codec_id == AV_CODEC_ID_ASV1) 303 a->inv_qscale = 6; 304 else 305 a->inv_qscale = 10; 306 } 307 308 for (i = 0; i < 64; i++) { 309 int index = ff_asv_scantab[i]; 310 311 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / 312 a->inv_qscale; 313 } 314 315 ff_thread_once(&init_static_once, init_vlcs); 316 317 return 0; 318} 319 320static av_cold int decode_end(AVCodecContext *avctx) 321{ 322 ASV1Context *const a = avctx->priv_data; 323 324 av_freep(&a->bitstream_buffer); 325 a->bitstream_buffer_size = 0; 326 327 return 0; 328} 329 330#if CONFIG_ASV1_DECODER 331const FFCodec ff_asv1_decoder = { 332 .p.name = "asv1", 333 .p.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"), 334 .p.type = AVMEDIA_TYPE_VIDEO, 335 .p.id = AV_CODEC_ID_ASV1, 336 .priv_data_size = sizeof(ASV1Context), 337 .init = decode_init, 338 .close = decode_end, 339 FF_CODEC_DECODE_CB(decode_frame), 340 .p.capabilities = AV_CODEC_CAP_DR1, 341 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 342}; 343#endif 344 345#if CONFIG_ASV2_DECODER 346const FFCodec ff_asv2_decoder = { 347 .p.name = "asv2", 348 .p.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"), 349 .p.type = AVMEDIA_TYPE_VIDEO, 350 .p.id = AV_CODEC_ID_ASV2, 351 .priv_data_size = sizeof(ASV1Context), 352 .init = decode_init, 353 FF_CODEC_DECODE_CB(decode_frame), 354 .p.capabilities = AV_CODEC_CAP_DR1, 355 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 356}; 357#endif 358