libavcodec/asvdec.c

   1 /*
   2  * Copyright (c) 2003 Michael Niedermayer
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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
  29 #include "asv.h"
  30 #include "avcodec.h"
  31 #include "put_bits.h"
  32 #include "internal.h"
  33 #include "mathops.h"
  34 #include "mpeg12data.h"
  35
  36 //#undef NDEBUG
  37 //#include <assert.h>
  38
  39 #define VLC_BITS 6
  40 #define ASV2_LEVEL_VLC_BITS 10
  41
  42 static VLC ccp_vlc;
  43 static VLC level_vlc;
  44 static VLC dc_ccp_vlc;
  45 static VLC ac_ccp_vlc;
  46 static VLC asv2_level_vlc;
  47
  48 static av_cold void init_vlcs(ASV1Context *a)
  49 {
  50     static int done = 0;
  51
  52     if (!done) {
  53         done = 1;
  54
  55         INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
  56                         &ff_asv_ccp_tab[0][1], 2, 1,
  57                         &ff_asv_ccp_tab[0][0], 2, 1, 64);
  58         INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
  59                         &ff_asv_dc_ccp_tab[0][1], 2, 1,
  60                         &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
  61         INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
  62                         &ff_asv_ac_ccp_tab[0][1], 2, 1,
  63                         &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
  64         INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,
  65                         &ff_asv_level_tab[0][1], 2, 1,
  66                         &ff_asv_level_tab[0][0], 2, 1, 64);
  67         INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
  68                         &ff_asv2_level_tab[0][1], 2, 1,
  69                         &ff_asv2_level_tab[0][0], 2, 1, 1024);
  70     }
  71 }
  72
  73 //FIXME write a reversed bitstream reader to avoid the double reverse
  74 static inline int asv2_get_bits(GetBitContext *gb, int n)
  75 {
  76     return ff_reverse[get_bits(gb, n) << (8-n)];
  77 }
  78
  79 static inline int asv1_get_level(GetBitContext *gb)
  80 {
  81     int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
  82
  83     if (code == 3)
  84         return get_sbits(gb, 8);
  85     else
  86         return code - 3;
  87 }
  88
  89 static inline int asv2_get_level(GetBitContext *gb)
  90 {
  91     int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
  92
  93     if (code == 31)
  94         return (int8_t)asv2_get_bits(gb, 8);
  95     else
  96         return code - 31;
  97 }
  98
  99 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
 100 {
 101     int i;
 102
 103     block[0] = 8 * get_bits(&a->gb, 8);
 104
 105     for (i = 0; i < 11; i++) {
 106         const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
 107
 108         if (ccp) {
 109             if (ccp == 16)
 110                 break;
 111             if (ccp < 0 || i >= 10) {
 112                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
 113                 return AVERROR_INVALIDDATA;
 114             }
 115
 116             if (ccp & 8)
 117                 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
 118             if (ccp & 4)
 119                 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
 120             if (ccp & 2)
 121                 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
 122             if (ccp & 1)
 123                 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
 124         }
 125     }
 126
 127     return 0;
 128 }
 129
 130 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
 131 {
 132     int i, count, ccp;
 133
 134     count = asv2_get_bits(&a->gb, 4);
 135
 136     block[0] = 8 * asv2_get_bits(&a->gb, 8);
 137
 138     ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
 139     if (ccp) {
 140         if (ccp & 4)
 141             block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
 142         if (ccp & 2)
 143             block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
 144         if (ccp & 1)
 145             block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
 146     }
 147
 148     for (i = 1; i < count + 1; i++) {
 149         const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
 150
 151         if (ccp) {
 152             if (ccp & 8)
 153                 block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
 154             if (ccp & 4)
 155                 block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
 156             if (ccp & 2)
 157                 block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
 158             if (ccp & 1)
 159                 block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
 160         }
 161     }
 162
 163     return 0;
 164 }
 165
 166 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
 167 {
 168     int i;
 169
 170     a->dsp.clear_blocks(block[0]);
 171
 172     if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
 173         for (i = 0; i < 6; i++) {
 174             if (asv1_decode_block(a, block[i]) < 0)
 175                 return -1;
 176         }
 177     } else {
 178         for (i = 0; i < 6; i++) {
 179             if (asv2_decode_block(a, block[i]) < 0)
 180                 return -1;
 181         }
 182     }
 183     return 0;
 184 }
 185
 186 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y)
 187 {
 188     int16_t (*block)[64] = a->block;
 189     int linesize         = a->picture.linesize[0];
 190
 191     uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
 192     uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
 193     uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 194
 195     a->dsp.idct_put(dest_y                 , linesize, block[0]);
 196     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
 197     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
 198     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
 199
 200     if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
 201         a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
 202         a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
 203     }
 204 }
 205
 206 static int decode_frame(AVCodecContext *avctx,
 207                         void *data, int *got_frame,
 208                         AVPacket *avpkt)
 209 {
 210     ASV1Context * const a = avctx->priv_data;
 211     const uint8_t *buf    = avpkt->data;
 212     int buf_size          = avpkt->size;
 213     AVFrame *picture      = data;
 214     AVFrame * const p     = &a->picture;
 215     int mb_x, mb_y, ret;
 216
 217     if (p->data[0])
 218         avctx->release_buffer(avctx, p);
 219
 220     p->reference = 0;
 221     if ((ret = ff_get_buffer(avctx, p)) < 0) {
 222         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 223         return ret;
 224     }
 225     p->pict_type = AV_PICTURE_TYPE_I;
 226     p->key_frame = 1;
 227
 228     av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
 229                           buf_size);
 230     if (!a->bitstream_buffer)
 231         return AVERROR(ENOMEM);
 232
 233     if (avctx->codec_id == AV_CODEC_ID_ASV1)
 234         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
 235     else {
 236         int i;
 237         for (i = 0; i < buf_size; i++)
 238             a->bitstream_buffer[i] = ff_reverse[buf[i]];
 239     }
 240
 241     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
 242
 243     for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
 244         for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
 245             if ((ret = decode_mb(a, a->block)) < 0)
 246                 return ret;
 247
 248             idct_put(a, mb_x, mb_y);
 249         }
 250     }
 251
 252     if (a->mb_width2 != a->mb_width) {
 253         mb_x = a->mb_width2;
 254         for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
 255             if ((ret = decode_mb(a, a->block)) < 0)
 256                 return ret;
 257
 258             idct_put(a, mb_x, mb_y);
 259         }
 260     }
 261
 262     if (a->mb_height2 != a->mb_height) {
 263         mb_y = a->mb_height2;
 264         for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
 265             if ((ret = decode_mb(a, a->block)) < 0)
 266                 return ret;
 267
 268             idct_put(a, mb_x, mb_y);
 269         }
 270     }
 271
 272     *picture   = a->picture;
 273     *got_frame = 1;
 274
 275     emms_c();
 276
 277     return (get_bits_count(&a->gb) + 31) / 32 * 4;
 278 }
 279
 280 static av_cold int decode_init(AVCodecContext *avctx)
 281 {
 282     ASV1Context * const a = avctx->priv_data;
 283     AVFrame *p            = &a->picture;
 284     const int scale       = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
 285     int i;
 286
 287     ff_asv_common_init(avctx);
 288     init_vlcs(a);
 289     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
 290     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
 291
 292     a->inv_qscale = avctx->extradata[0];
 293     if (a->inv_qscale == 0) {
 294         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
 295         if (avctx->codec_id == AV_CODEC_ID_ASV1)
 296             a->inv_qscale = 6;
 297         else
 298             a->inv_qscale = 10;
 299     }
 300
 301     for (i = 0; i < 64; i++) {
 302         int index = ff_asv_scantab[i];
 303
 304         a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
 305     }
 306
 307     p->qstride      = a->mb_width;
 308     p->qscale_table = av_malloc(p->qstride * a->mb_height);
 309     p->quality      = (32 * scale + a->inv_qscale / 2) / a->inv_qscale;
 310     memset(p->qscale_table, p->quality, p->qstride * a->mb_height);
 311
 312     return 0;
 313 }
 314
 315 static av_cold int decode_end(AVCodecContext *avctx)
 316 {
 317     ASV1Context * const a = avctx->priv_data;
 318
 319     av_freep(&a->bitstream_buffer);
 320     av_freep(&a->picture.qscale_table);
 321     a->bitstream_buffer_size = 0;
 322
 323     if (a->picture.data[0])
 324         avctx->release_buffer(avctx, &a->picture);
 325
 326     return 0;
 327 }
 328
 329 AVCodec ff_asv1_decoder = {
 330     .name           = "asv1",
 331     .type           = AVMEDIA_TYPE_VIDEO,
 332     .id             = AV_CODEC_ID_ASV1,
 333     .priv_data_size = sizeof(ASV1Context),
 334     .init           = decode_init,
 335     .close          = decode_end,
 336     .decode         = decode_frame,
 337     .capabilities   = CODEC_CAP_DR1,
 338     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),
 339 };
 340
 341 AVCodec ff_asv2_decoder = {
 342     .name           = "asv2",
 343     .type           = AVMEDIA_TYPE_VIDEO,
 344     .id             = AV_CODEC_ID_ASV2,
 345     .priv_data_size = sizeof(ASV1Context),
 346     .init           = decode_init,
 347     .close          = decode_end,
 348     .decode         = decode_frame,
 349     .capabilities   = CODEC_CAP_DR1,
 350     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),
 351 };
 352