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libavcodec/indeo5.c

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00001 /*
00002  * Indeo Video Interactive v5 compatible decoder
00003  * Copyright (c) 2009 Maxim Poliakovski
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 
00030 #define BITSTREAM_READER_LE
00031 #include "avcodec.h"
00032 #include "get_bits.h"
00033 #include "dsputil.h"
00034 #include "ivi_dsp.h"
00035 #include "ivi_common.h"
00036 #include "indeo5data.h"
00037 
00041 enum {
00042     FRAMETYPE_INTRA       = 0,
00043     FRAMETYPE_INTER       = 1,  
00044     FRAMETYPE_INTER_SCAL  = 2,  
00045     FRAMETYPE_INTER_NOREF = 3,  
00046     FRAMETYPE_NULL        = 4   
00047 };
00048 
00049 #define IVI5_PIC_SIZE_ESC       15
00050 
00051 #define IVI5_IS_PROTECTED       0x20
00052 
00053 typedef struct {
00054     GetBitContext   gb;
00055     AVFrame         frame;
00056     RVMapDesc       rvmap_tabs[9];   
00057     IVIPlaneDesc    planes[3];       
00058     const uint8_t   *frame_data;     
00059     int             buf_switch;      
00060     int             inter_scal;      
00061     int             dst_buf;         
00062     int             ref_buf;         
00063     int             ref2_buf;        
00064     uint32_t        frame_size;      
00065     int             frame_type;
00066     int             prev_frame_type; 
00067     int             frame_num;
00068     uint32_t        pic_hdr_size;    
00069     uint8_t         frame_flags;
00070     uint16_t        checksum;        
00071 
00072     IVIHuffTab      mb_vlc;          
00073 
00074     uint16_t        gop_hdr_size;
00075     uint8_t         gop_flags;
00076     int             is_scalable;
00077     uint32_t        lock_word;
00078     IVIPicConfig    pic_conf;
00079 } IVI5DecContext;
00080 
00081 
00091 static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
00092 {
00093     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
00094     int             quant_mat, blk_size_changed = 0;
00095     IVIBandDesc     *band, *band1, *band2;
00096     IVIPicConfig    pic_conf;
00097 
00098     ctx->gop_flags = get_bits(&ctx->gb, 8);
00099 
00100     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
00101 
00102     if (ctx->gop_flags & IVI5_IS_PROTECTED)
00103         ctx->lock_word = get_bits_long(&ctx->gb, 32);
00104 
00105     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
00106     if (tile_size > 256) {
00107         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
00108         return -1;
00109     }
00110 
00111     /* decode number of wavelet bands */
00112     /* num_levels * 3 + 1 */
00113     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
00114     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
00115     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
00116     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
00117         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
00118                pic_conf.luma_bands, pic_conf.chroma_bands);
00119         return -1;
00120     }
00121 
00122     pic_size_indx = get_bits(&ctx->gb, 4);
00123     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
00124         pic_conf.pic_height = get_bits(&ctx->gb, 13);
00125         pic_conf.pic_width  = get_bits(&ctx->gb, 13);
00126     } else {
00127         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
00128         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
00129     }
00130 
00131     if (ctx->gop_flags & 2) {
00132         av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
00133         return -1;
00134     }
00135 
00136     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
00137     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
00138 
00139     if (!tile_size) {
00140         pic_conf.tile_height = pic_conf.pic_height;
00141         pic_conf.tile_width  = pic_conf.pic_width;
00142     } else {
00143         pic_conf.tile_height = pic_conf.tile_width = tile_size;
00144     }
00145 
00146     /* check if picture layout was changed and reallocate buffers */
00147     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
00148         result = ff_ivi_init_planes(ctx->planes, &pic_conf);
00149         if (result) {
00150             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
00151             return -1;
00152         }
00153         ctx->pic_conf = pic_conf;
00154         blk_size_changed = 1; /* force reallocation of the internal structures */
00155     }
00156 
00157     for (p = 0; p <= 1; p++) {
00158         for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
00159             band = &ctx->planes[p].bands[i];
00160 
00161             band->is_halfpel = get_bits1(&ctx->gb);
00162 
00163             mb_size  = get_bits1(&ctx->gb);
00164             blk_size = 8 >> get_bits1(&ctx->gb);
00165             mb_size  = blk_size << !mb_size;
00166 
00167             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
00168             if (blk_size_changed) {
00169                 band->mb_size  = mb_size;
00170                 band->blk_size = blk_size;
00171             }
00172 
00173             if (get_bits1(&ctx->gb)) {
00174                 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
00175                 return -1;
00176             }
00177 
00178             /* select transform function and scan pattern according to plane and band number */
00179             switch ((p << 2) + i) {
00180             case 0:
00181                 band->inv_transform = ff_ivi_inverse_slant_8x8;
00182                 band->dc_transform  = ff_ivi_dc_slant_2d;
00183                 band->scan          = ff_zigzag_direct;
00184                 break;
00185 
00186             case 1:
00187                 band->inv_transform = ff_ivi_row_slant8;
00188                 band->dc_transform  = ff_ivi_dc_row_slant;
00189                 band->scan          = ff_ivi_vertical_scan_8x8;
00190                 break;
00191 
00192             case 2:
00193                 band->inv_transform = ff_ivi_col_slant8;
00194                 band->dc_transform  = ff_ivi_dc_col_slant;
00195                 band->scan          = ff_ivi_horizontal_scan_8x8;
00196                 break;
00197 
00198             case 3:
00199                 band->inv_transform = ff_ivi_put_pixels_8x8;
00200                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
00201                 band->scan          = ff_ivi_horizontal_scan_8x8;
00202                 break;
00203 
00204             case 4:
00205                 band->inv_transform = ff_ivi_inverse_slant_4x4;
00206                 band->dc_transform  = ff_ivi_dc_slant_2d;
00207                 band->scan          = ff_ivi_direct_scan_4x4;
00208                 break;
00209             }
00210 
00211             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
00212                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
00213 
00214             /* select dequant matrix according to plane and band number */
00215             if (!p) {
00216                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
00217             } else {
00218                 quant_mat = 5;
00219             }
00220 
00221             if (band->blk_size == 8) {
00222                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
00223                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
00224                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
00225                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
00226             } else {
00227                 band->intra_base  = ivi5_base_quant_4x4_intra;
00228                 band->inter_base  = ivi5_base_quant_4x4_inter;
00229                 band->intra_scale = ivi5_scale_quant_4x4_intra;
00230                 band->inter_scale = ivi5_scale_quant_4x4_inter;
00231             }
00232 
00233             if (get_bits(&ctx->gb, 2)) {
00234                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
00235                 return -1;
00236             }
00237         }
00238     }
00239 
00240     /* copy chroma parameters into the 2nd chroma plane */
00241     for (i = 0; i < pic_conf.chroma_bands; i++) {
00242         band1 = &ctx->planes[1].bands[i];
00243         band2 = &ctx->planes[2].bands[i];
00244 
00245         band2->width         = band1->width;
00246         band2->height        = band1->height;
00247         band2->mb_size       = band1->mb_size;
00248         band2->blk_size      = band1->blk_size;
00249         band2->is_halfpel    = band1->is_halfpel;
00250         band2->intra_base    = band1->intra_base;
00251         band2->inter_base    = band1->inter_base;
00252         band2->intra_scale   = band1->intra_scale;
00253         band2->inter_scale   = band1->inter_scale;
00254         band2->scan          = band1->scan;
00255         band2->inv_transform = band1->inv_transform;
00256         band2->dc_transform  = band1->dc_transform;
00257         band2->is_2d_trans   = band1->is_2d_trans;
00258     }
00259 
00260     /* reallocate internal structures if needed */
00261     if (blk_size_changed) {
00262         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
00263                                    pic_conf.tile_height);
00264         if (result) {
00265             av_log(avctx, AV_LOG_ERROR,
00266                    "Couldn't reallocate internal structures!\n");
00267             return -1;
00268         }
00269     }
00270 
00271     if (ctx->gop_flags & 8) {
00272         if (get_bits(&ctx->gb, 3)) {
00273             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
00274             return -1;
00275         }
00276 
00277         if (get_bits1(&ctx->gb))
00278             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
00279     }
00280 
00281     align_get_bits(&ctx->gb);
00282 
00283     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
00284 
00285     /* skip GOP extension if any */
00286     if (get_bits1(&ctx->gb)) {
00287         do {
00288             i = get_bits(&ctx->gb, 16);
00289         } while (i & 0x8000);
00290     }
00291 
00292     align_get_bits(&ctx->gb);
00293 
00294     return 0;
00295 }
00296 
00297 
00303 static inline void skip_hdr_extension(GetBitContext *gb)
00304 {
00305     int i, len;
00306 
00307     do {
00308         len = get_bits(gb, 8);
00309         for (i = 0; i < len; i++) skip_bits(gb, 8);
00310     } while(len);
00311 }
00312 
00313 
00321 static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
00322 {
00323     if (get_bits(&ctx->gb, 5) != 0x1F) {
00324         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
00325         return -1;
00326     }
00327 
00328     ctx->prev_frame_type = ctx->frame_type;
00329     ctx->frame_type      = get_bits(&ctx->gb, 3);
00330     if (ctx->frame_type >= 5) {
00331         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
00332         return -1;
00333     }
00334 
00335     ctx->frame_num = get_bits(&ctx->gb, 8);
00336 
00337     if (ctx->frame_type == FRAMETYPE_INTRA) {
00338         if (decode_gop_header(ctx, avctx))
00339             return -1;
00340     }
00341 
00342     if (ctx->frame_type != FRAMETYPE_NULL) {
00343         ctx->frame_flags = get_bits(&ctx->gb, 8);
00344 
00345         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
00346 
00347         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
00348 
00349         /* skip unknown extension if any */
00350         if (ctx->frame_flags & 0x20)
00351             skip_hdr_extension(&ctx->gb); /* XXX: untested */
00352 
00353         /* decode macroblock huffman codebook */
00354         if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
00355             return -1;
00356 
00357         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
00358     }
00359 
00360     align_get_bits(&ctx->gb);
00361 
00362     return 0;
00363 }
00364 
00365 
00374 static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
00375                            AVCodecContext *avctx)
00376 {
00377     int         i;
00378     uint8_t     band_flags;
00379 
00380     band_flags = get_bits(&ctx->gb, 8);
00381 
00382     if (band_flags & 1) {
00383         band->is_empty = 1;
00384         return 0;
00385     }
00386 
00387     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
00388 
00389     band->inherit_mv     = band_flags & 2;
00390     band->inherit_qdelta = band_flags & 8;
00391     band->qdelta_present = band_flags & 4;
00392     if (!band->qdelta_present) band->inherit_qdelta = 1;
00393 
00394     /* decode rvmap probability corrections if any */
00395     band->num_corr = 0; /* there are no corrections */
00396     if (band_flags & 0x10) {
00397         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
00398         if (band->num_corr > 61) {
00399             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
00400                    band->num_corr);
00401             return -1;
00402         }
00403 
00404         /* read correction pairs */
00405         for (i = 0; i < band->num_corr * 2; i++)
00406             band->corr[i] = get_bits(&ctx->gb, 8);
00407     }
00408 
00409     /* select appropriate rvmap table for this band */
00410     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
00411 
00412     /* decode block huffman codebook */
00413     if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
00414         return -1;
00415 
00416     band->checksum_present = get_bits1(&ctx->gb);
00417     if (band->checksum_present)
00418         band->checksum = get_bits(&ctx->gb, 16);
00419 
00420     band->glob_quant = get_bits(&ctx->gb, 5);
00421 
00422     /* skip unknown extension if any */
00423     if (band_flags & 0x20) { /* XXX: untested */
00424         align_get_bits(&ctx->gb);
00425         skip_hdr_extension(&ctx->gb);
00426     }
00427 
00428     align_get_bits(&ctx->gb);
00429 
00430     return 0;
00431 }
00432 
00433 
00444 static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
00445                           IVITile *tile, AVCodecContext *avctx)
00446 {
00447     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
00448                 mv_scale, blks_per_mb;
00449     IVIMbInfo   *mb, *ref_mb;
00450     int         row_offset = band->mb_size * band->pitch;
00451 
00452     mb     = tile->mbs;
00453     ref_mb = tile->ref_mbs;
00454     offs   = tile->ypos * band->pitch + tile->xpos;
00455 
00456     /* scale factor for motion vectors */
00457     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
00458     mv_x = mv_y = 0;
00459 
00460     for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
00461         mb_offset = offs;
00462 
00463         for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
00464             mb->xpos     = x;
00465             mb->ypos     = y;
00466             mb->buf_offs = mb_offset;
00467 
00468             if (get_bits1(&ctx->gb)) {
00469                 if (ctx->frame_type == FRAMETYPE_INTRA) {
00470                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
00471                     return -1;
00472                 }
00473                 mb->type = 1; /* empty macroblocks are always INTER */
00474                 mb->cbp  = 0; /* all blocks are empty */
00475 
00476                 mb->q_delta = 0;
00477                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
00478                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00479                                            IVI_VLC_BITS, 1);
00480                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00481                 }
00482 
00483                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
00484                 if (band->inherit_mv){
00485                     /* motion vector inheritance */
00486                     if (mv_scale) {
00487                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00488                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00489                     } else {
00490                         mb->mv_x = ref_mb->mv_x;
00491                         mb->mv_y = ref_mb->mv_y;
00492                     }
00493                 }
00494             } else {
00495                 if (band->inherit_mv) {
00496                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
00497                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
00498                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
00499                 } else {
00500                     mb->type = get_bits1(&ctx->gb);
00501                 }
00502 
00503                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
00504                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
00505 
00506                 mb->q_delta = 0;
00507                 if (band->qdelta_present) {
00508                     if (band->inherit_qdelta) {
00509                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
00510                     } else if (mb->cbp || (!band->plane && !band->band_num &&
00511                                            (ctx->frame_flags & 8))) {
00512                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00513                                                IVI_VLC_BITS, 1);
00514                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00515                     }
00516                 }
00517 
00518                 if (!mb->type) {
00519                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
00520                 } else {
00521                     if (band->inherit_mv){
00522                         /* motion vector inheritance */
00523                         if (mv_scale) {
00524                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00525                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00526                         } else {
00527                             mb->mv_x = ref_mb->mv_x;
00528                             mb->mv_y = ref_mb->mv_y;
00529                         }
00530                     } else {
00531                         /* decode motion vector deltas */
00532                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00533                                             IVI_VLC_BITS, 1);
00534                         mv_y += IVI_TOSIGNED(mv_delta);
00535                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00536                                             IVI_VLC_BITS, 1);
00537                         mv_x += IVI_TOSIGNED(mv_delta);
00538                         mb->mv_x = mv_x;
00539                         mb->mv_y = mv_y;
00540                     }
00541                 }
00542             }
00543 
00544             mb++;
00545             if (ref_mb)
00546                 ref_mb++;
00547             mb_offset += band->mb_size;
00548         }
00549 
00550         offs += row_offset;
00551     }
00552 
00553     align_get_bits(&ctx->gb);
00554 
00555     return 0;
00556 }
00557 
00558 
00567 static int decode_band(IVI5DecContext *ctx, int plane_num,
00568                        IVIBandDesc *band, AVCodecContext *avctx)
00569 {
00570     int         result, i, t, idx1, idx2, pos;
00571     IVITile     *tile;
00572 
00573     band->buf     = band->bufs[ctx->dst_buf];
00574     band->ref_buf = band->bufs[ctx->ref_buf];
00575     band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
00576 
00577     result = decode_band_hdr(ctx, band, avctx);
00578     if (result) {
00579         av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
00580                result);
00581         return -1;
00582     }
00583 
00584     if (band->is_empty) {
00585         av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
00586         return -1;
00587     }
00588 
00589     band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
00590 
00591     /* apply corrections to the selected rvmap table if present */
00592     for (i = 0; i < band->num_corr; i++) {
00593         idx1 = band->corr[i*2];
00594         idx2 = band->corr[i*2+1];
00595         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
00596         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
00597     }
00598 
00599     pos = get_bits_count(&ctx->gb);
00600 
00601     for (t = 0; t < band->num_tiles; t++) {
00602         tile = &band->tiles[t];
00603 
00604         tile->is_empty = get_bits1(&ctx->gb);
00605         if (tile->is_empty) {
00606             ff_ivi_process_empty_tile(avctx, band, tile,
00607                                       (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
00608         } else {
00609             tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
00610 
00611             result = decode_mb_info(ctx, band, tile, avctx);
00612             if (result < 0)
00613                 break;
00614 
00615             result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
00616             if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
00617                 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
00618                 break;
00619             }
00620             pos += tile->data_size << 3; // skip to next tile
00621         }
00622     }
00623 
00624     /* restore the selected rvmap table by applying its corrections in reverse order */
00625     for (i = band->num_corr-1; i >= 0; i--) {
00626         idx1 = band->corr[i*2];
00627         idx2 = band->corr[i*2+1];
00628         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
00629         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
00630     }
00631 
00632 #ifdef DEBUG
00633     if (band->checksum_present) {
00634         uint16_t chksum = ivi_calc_band_checksum(band);
00635         if (chksum != band->checksum) {
00636             av_log(avctx, AV_LOG_ERROR,
00637                    "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
00638                    band->plane, band->band_num, band->checksum, chksum);
00639         }
00640     }
00641 #endif
00642 
00643     align_get_bits(&ctx->gb);
00644 
00645     return result;
00646 }
00647 
00648 
00654 static void switch_buffers(IVI5DecContext *ctx)
00655 {
00656     switch (ctx->prev_frame_type) {
00657     case FRAMETYPE_INTRA:
00658     case FRAMETYPE_INTER:
00659         ctx->buf_switch ^= 1;
00660         ctx->dst_buf = ctx->buf_switch;
00661         ctx->ref_buf = ctx->buf_switch ^ 1;
00662         break;
00663     case FRAMETYPE_INTER_SCAL:
00664         if (!ctx->inter_scal) {
00665             ctx->ref2_buf   = 2;
00666             ctx->inter_scal = 1;
00667         }
00668         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
00669         ctx->ref_buf = ctx->ref2_buf;
00670         break;
00671     case FRAMETYPE_INTER_NOREF:
00672         break;
00673     }
00674 
00675     switch (ctx->frame_type) {
00676     case FRAMETYPE_INTRA:
00677         ctx->buf_switch = 0;
00678         /* FALLTHROUGH */
00679     case FRAMETYPE_INTER:
00680         ctx->inter_scal = 0;
00681         ctx->dst_buf = ctx->buf_switch;
00682         ctx->ref_buf = ctx->buf_switch ^ 1;
00683         break;
00684     case FRAMETYPE_INTER_SCAL:
00685     case FRAMETYPE_INTER_NOREF:
00686     case FRAMETYPE_NULL:
00687         break;
00688     }
00689 }
00690 
00691 
00695 static av_cold int decode_init(AVCodecContext *avctx)
00696 {
00697     IVI5DecContext  *ctx = avctx->priv_data;
00698     int             result;
00699 
00700     ff_ivi_init_static_vlc();
00701 
00702     /* copy rvmap tables in our context so we can apply changes to them */
00703     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
00704 
00705     /* set the initial picture layout according to the basic profile:
00706        there is only one band per plane (no scalability), only one tile (no local decoding)
00707        and picture format = YVU9 */
00708     ctx->pic_conf.pic_width     = avctx->width;
00709     ctx->pic_conf.pic_height    = avctx->height;
00710     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
00711     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
00712     ctx->pic_conf.tile_width    = avctx->width;
00713     ctx->pic_conf.tile_height   = avctx->height;
00714     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
00715 
00716     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
00717     if (result) {
00718         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
00719         return -1;
00720     }
00721 
00722     ctx->buf_switch = 0;
00723     ctx->inter_scal = 0;
00724 
00725     avctx->pix_fmt = PIX_FMT_YUV410P;
00726 
00727     return 0;
00728 }
00729 
00730 
00734 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00735                         AVPacket *avpkt)
00736 {
00737     IVI5DecContext  *ctx = avctx->priv_data;
00738     const uint8_t   *buf = avpkt->data;
00739     int             buf_size = avpkt->size;
00740     int             result, p, b;
00741 
00742     init_get_bits(&ctx->gb, buf, buf_size * 8);
00743     ctx->frame_data = buf;
00744     ctx->frame_size = buf_size;
00745 
00746     result = decode_pic_hdr(ctx, avctx);
00747     if (result) {
00748         av_log(avctx, AV_LOG_ERROR,
00749                "Error while decoding picture header: %d\n", result);
00750         return -1;
00751     }
00752 
00753     if (ctx->gop_flags & IVI5_IS_PROTECTED) {
00754         av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
00755         return -1;
00756     }
00757 
00758     switch_buffers(ctx);
00759 
00760     //{ START_TIMER;
00761 
00762     if (ctx->frame_type != FRAMETYPE_NULL) {
00763         for (p = 0; p < 3; p++) {
00764             for (b = 0; b < ctx->planes[p].num_bands; b++) {
00765                 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
00766                 if (result) {
00767                     av_log(avctx, AV_LOG_ERROR,
00768                            "Error while decoding band: %d, plane: %d\n", b, p);
00769                     return -1;
00770                 }
00771             }
00772         }
00773     }
00774 
00775     //STOP_TIMER("decode_planes"); }
00776 
00777     if (ctx->frame.data[0])
00778         avctx->release_buffer(avctx, &ctx->frame);
00779 
00780     ctx->frame.reference = 0;
00781     if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
00782         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00783         return -1;
00784     }
00785 
00786     if (ctx->is_scalable) {
00787         ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
00788     } else {
00789         ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
00790     }
00791 
00792     ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
00793     ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
00794 
00795     *data_size = sizeof(AVFrame);
00796     *(AVFrame*)data = ctx->frame;
00797 
00798     return buf_size;
00799 }
00800 
00801 
00805 static av_cold int decode_close(AVCodecContext *avctx)
00806 {
00807     IVI5DecContext *ctx = avctx->priv_data;
00808 
00809     ff_ivi_free_buffers(&ctx->planes[0]);
00810 
00811     if (ctx->mb_vlc.cust_tab.table)
00812         free_vlc(&ctx->mb_vlc.cust_tab);
00813 
00814     if (ctx->frame.data[0])
00815         avctx->release_buffer(avctx, &ctx->frame);
00816 
00817     return 0;
00818 }
00819 
00820 
00821 AVCodec ff_indeo5_decoder = {
00822     .name           = "indeo5",
00823     .type           = AVMEDIA_TYPE_VIDEO,
00824     .id             = CODEC_ID_INDEO5,
00825     .priv_data_size = sizeof(IVI5DecContext),
00826     .init           = decode_init,
00827     .close          = decode_close,
00828     .decode         = decode_frame,
00829     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
00830 };
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