Libav 0.7.1
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 ALT_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 
00080     int gop_invalid;
00081 } IVI5DecContext;
00082 
00083 
00093 static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx)
00094 {
00095     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
00096     int             quant_mat, blk_size_changed = 0;
00097     IVIBandDesc     *band, *band1, *band2;
00098     IVIPicConfig    pic_conf;
00099 
00100     ctx->gop_flags = get_bits(&ctx->gb, 8);
00101 
00102     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
00103 
00104     if (ctx->gop_flags & IVI5_IS_PROTECTED)
00105         ctx->lock_word = get_bits_long(&ctx->gb, 32);
00106 
00107     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
00108     if (tile_size > 256) {
00109         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
00110         return -1;
00111     }
00112 
00113     /* decode number of wavelet bands */
00114     /* num_levels * 3 + 1 */
00115     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
00116     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
00117     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
00118     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
00119         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
00120                pic_conf.luma_bands, pic_conf.chroma_bands);
00121         return -1;
00122     }
00123 
00124     pic_size_indx = get_bits(&ctx->gb, 4);
00125     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
00126         pic_conf.pic_height = get_bits(&ctx->gb, 13);
00127         pic_conf.pic_width  = get_bits(&ctx->gb, 13);
00128     } else {
00129         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
00130         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
00131     }
00132 
00133     if (ctx->gop_flags & 2) {
00134         av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
00135         return -1;
00136     }
00137 
00138     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
00139     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
00140 
00141     if (!tile_size) {
00142         pic_conf.tile_height = pic_conf.pic_height;
00143         pic_conf.tile_width  = pic_conf.pic_width;
00144     } else {
00145         pic_conf.tile_height = pic_conf.tile_width = tile_size;
00146     }
00147 
00148     /* check if picture layout was changed and reallocate buffers */
00149     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
00150         result = ff_ivi_init_planes(ctx->planes, &pic_conf);
00151         if (result) {
00152             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
00153             return -1;
00154         }
00155         ctx->pic_conf = pic_conf;
00156         blk_size_changed = 1; /* force reallocation of the internal structures */
00157     }
00158 
00159     for (p = 0; p <= 1; p++) {
00160         for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
00161             band = &ctx->planes[p].bands[i];
00162 
00163             band->is_halfpel = get_bits1(&ctx->gb);
00164 
00165             mb_size  = get_bits1(&ctx->gb);
00166             blk_size = 8 >> get_bits1(&ctx->gb);
00167             mb_size  = blk_size << !mb_size;
00168 
00169             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
00170             if (blk_size_changed) {
00171                 band->mb_size  = mb_size;
00172                 band->blk_size = blk_size;
00173             }
00174 
00175             if (get_bits1(&ctx->gb)) {
00176                 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
00177                 return -1;
00178             }
00179 
00180             /* select transform function and scan pattern according to plane and band number */
00181             switch ((p << 2) + i) {
00182             case 0:
00183                 band->inv_transform = ff_ivi_inverse_slant_8x8;
00184                 band->dc_transform  = ff_ivi_dc_slant_2d;
00185                 band->scan          = ff_zigzag_direct;
00186                 break;
00187 
00188             case 1:
00189                 band->inv_transform = ff_ivi_row_slant8;
00190                 band->dc_transform  = ff_ivi_dc_row_slant;
00191                 band->scan          = ff_ivi_vertical_scan_8x8;
00192                 break;
00193 
00194             case 2:
00195                 band->inv_transform = ff_ivi_col_slant8;
00196                 band->dc_transform  = ff_ivi_dc_col_slant;
00197                 band->scan          = ff_ivi_horizontal_scan_8x8;
00198                 break;
00199 
00200             case 3:
00201                 band->inv_transform = ff_ivi_put_pixels_8x8;
00202                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
00203                 band->scan          = ff_ivi_horizontal_scan_8x8;
00204                 break;
00205 
00206             case 4:
00207                 band->inv_transform = ff_ivi_inverse_slant_4x4;
00208                 band->dc_transform  = ff_ivi_dc_slant_2d;
00209                 band->scan          = ff_ivi_direct_scan_4x4;
00210                 break;
00211             }
00212 
00213             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
00214                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
00215 
00216             /* select dequant matrix according to plane and band number */
00217             if (!p) {
00218                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
00219             } else {
00220                 quant_mat = 5;
00221             }
00222 
00223             if (band->blk_size == 8) {
00224                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
00225                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
00226                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
00227                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
00228             } else {
00229                 band->intra_base  = ivi5_base_quant_4x4_intra;
00230                 band->inter_base  = ivi5_base_quant_4x4_inter;
00231                 band->intra_scale = ivi5_scale_quant_4x4_intra;
00232                 band->inter_scale = ivi5_scale_quant_4x4_inter;
00233             }
00234 
00235             if (get_bits(&ctx->gb, 2)) {
00236                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
00237                 return -1;
00238             }
00239         }
00240     }
00241 
00242     /* copy chroma parameters into the 2nd chroma plane */
00243     for (i = 0; i < pic_conf.chroma_bands; i++) {
00244         band1 = &ctx->planes[1].bands[i];
00245         band2 = &ctx->planes[2].bands[i];
00246 
00247         band2->width         = band1->width;
00248         band2->height        = band1->height;
00249         band2->mb_size       = band1->mb_size;
00250         band2->blk_size      = band1->blk_size;
00251         band2->is_halfpel    = band1->is_halfpel;
00252         band2->intra_base    = band1->intra_base;
00253         band2->inter_base    = band1->inter_base;
00254         band2->intra_scale   = band1->intra_scale;
00255         band2->inter_scale   = band1->inter_scale;
00256         band2->scan          = band1->scan;
00257         band2->inv_transform = band1->inv_transform;
00258         band2->dc_transform  = band1->dc_transform;
00259         band2->is_2d_trans   = band1->is_2d_trans;
00260     }
00261 
00262     /* reallocate internal structures if needed */
00263     if (blk_size_changed) {
00264         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
00265                                    pic_conf.tile_height);
00266         if (result) {
00267             av_log(avctx, AV_LOG_ERROR,
00268                    "Couldn't reallocate internal structures!\n");
00269             return -1;
00270         }
00271     }
00272 
00273     if (ctx->gop_flags & 8) {
00274         if (get_bits(&ctx->gb, 3)) {
00275             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
00276             return -1;
00277         }
00278 
00279         if (get_bits1(&ctx->gb))
00280             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
00281     }
00282 
00283     align_get_bits(&ctx->gb);
00284 
00285     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
00286 
00287     /* skip GOP extension if any */
00288     if (get_bits1(&ctx->gb)) {
00289         do {
00290             i = get_bits(&ctx->gb, 16);
00291         } while (i & 0x8000);
00292     }
00293 
00294     align_get_bits(&ctx->gb);
00295 
00296     return 0;
00297 }
00298 
00299 
00305 static inline void skip_hdr_extension(GetBitContext *gb)
00306 {
00307     int i, len;
00308 
00309     do {
00310         len = get_bits(gb, 8);
00311         for (i = 0; i < len; i++) skip_bits(gb, 8);
00312     } while(len);
00313 }
00314 
00315 
00323 static int decode_pic_hdr(IVI5DecContext *ctx, AVCodecContext *avctx)
00324 {
00325     if (get_bits(&ctx->gb, 5) != 0x1F) {
00326         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
00327         return -1;
00328     }
00329 
00330     ctx->prev_frame_type = ctx->frame_type;
00331     ctx->frame_type      = get_bits(&ctx->gb, 3);
00332     if (ctx->frame_type >= 5) {
00333         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
00334         return -1;
00335     }
00336 
00337     ctx->frame_num = get_bits(&ctx->gb, 8);
00338 
00339     if (ctx->frame_type == FRAMETYPE_INTRA) {
00340         ctx->gop_invalid = 1;
00341         if (decode_gop_header(ctx, avctx))
00342             return -1;
00343         ctx->gop_invalid = 0;
00344     }
00345 
00346     if (ctx->frame_type != FRAMETYPE_NULL) {
00347         ctx->frame_flags = get_bits(&ctx->gb, 8);
00348 
00349         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
00350 
00351         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
00352 
00353         /* skip unknown extension if any */
00354         if (ctx->frame_flags & 0x20)
00355             skip_hdr_extension(&ctx->gb); /* XXX: untested */
00356 
00357         /* decode macroblock huffman codebook */
00358         if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
00359             return -1;
00360 
00361         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
00362     }
00363 
00364     align_get_bits(&ctx->gb);
00365 
00366     return 0;
00367 }
00368 
00369 
00378 static int decode_band_hdr(IVI5DecContext *ctx, IVIBandDesc *band,
00379                            AVCodecContext *avctx)
00380 {
00381     int         i;
00382     uint8_t     band_flags;
00383 
00384     band_flags = get_bits(&ctx->gb, 8);
00385 
00386     if (band_flags & 1) {
00387         band->is_empty = 1;
00388         return 0;
00389     }
00390 
00391     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
00392 
00393     band->inherit_mv     = band_flags & 2;
00394     band->inherit_qdelta = band_flags & 8;
00395     band->qdelta_present = band_flags & 4;
00396     if (!band->qdelta_present) band->inherit_qdelta = 1;
00397 
00398     /* decode rvmap probability corrections if any */
00399     band->num_corr = 0; /* there are no corrections */
00400     if (band_flags & 0x10) {
00401         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
00402         if (band->num_corr > 61) {
00403             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
00404                    band->num_corr);
00405             return -1;
00406         }
00407 
00408         /* read correction pairs */
00409         for (i = 0; i < band->num_corr * 2; i++)
00410             band->corr[i] = get_bits(&ctx->gb, 8);
00411     }
00412 
00413     /* select appropriate rvmap table for this band */
00414     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
00415 
00416     /* decode block huffman codebook */
00417     if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
00418         return -1;
00419 
00420     band->checksum_present = get_bits1(&ctx->gb);
00421     if (band->checksum_present)
00422         band->checksum = get_bits(&ctx->gb, 16);
00423 
00424     band->glob_quant = get_bits(&ctx->gb, 5);
00425 
00426     /* skip unknown extension if any */
00427     if (band_flags & 0x20) { /* XXX: untested */
00428         align_get_bits(&ctx->gb);
00429         skip_hdr_extension(&ctx->gb);
00430     }
00431 
00432     align_get_bits(&ctx->gb);
00433 
00434     return 0;
00435 }
00436 
00437 
00448 static int decode_mb_info(IVI5DecContext *ctx, IVIBandDesc *band,
00449                           IVITile *tile, AVCodecContext *avctx)
00450 {
00451     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
00452                 mv_scale, blks_per_mb;
00453     IVIMbInfo   *mb, *ref_mb;
00454     int         row_offset = band->mb_size * band->pitch;
00455 
00456     mb     = tile->mbs;
00457     ref_mb = tile->ref_mbs;
00458     offs   = tile->ypos * band->pitch + tile->xpos;
00459 
00460     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
00461         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches parameters %d\n",
00462                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));
00463         return AVERROR_INVALIDDATA;
00464     }
00465 
00466     /* scale factor for motion vectors */
00467     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
00468     mv_x = mv_y = 0;
00469 
00470     for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
00471         mb_offset = offs;
00472 
00473         for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
00474             mb->xpos     = x;
00475             mb->ypos     = y;
00476             mb->buf_offs = mb_offset;
00477 
00478             if (get_bits1(&ctx->gb)) {
00479                 if (ctx->frame_type == FRAMETYPE_INTRA) {
00480                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
00481                     return -1;
00482                 }
00483                 mb->type = 1; /* empty macroblocks are always INTER */
00484                 mb->cbp  = 0; /* all blocks are empty */
00485 
00486                 mb->q_delta = 0;
00487                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
00488                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00489                                            IVI_VLC_BITS, 1);
00490                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00491                 }
00492 
00493                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
00494                 if (band->inherit_mv){
00495                     /* motion vector inheritance */
00496                     if (mv_scale) {
00497                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00498                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00499                     } else {
00500                         mb->mv_x = ref_mb->mv_x;
00501                         mb->mv_y = ref_mb->mv_y;
00502                     }
00503                 }
00504             } else {
00505                 if (band->inherit_mv) {
00506                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
00507                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
00508                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
00509                 } else {
00510                     mb->type = get_bits1(&ctx->gb);
00511                 }
00512 
00513                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
00514                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
00515 
00516                 mb->q_delta = 0;
00517                 if (band->qdelta_present) {
00518                     if (band->inherit_qdelta) {
00519                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
00520                     } else if (mb->cbp || (!band->plane && !band->band_num &&
00521                                            (ctx->frame_flags & 8))) {
00522                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00523                                                IVI_VLC_BITS, 1);
00524                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00525                     }
00526                 }
00527 
00528                 if (!mb->type) {
00529                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
00530                 } else {
00531                     if (band->inherit_mv){
00532                         /* motion vector inheritance */
00533                         if (mv_scale) {
00534                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00535                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00536                         } else {
00537                             mb->mv_x = ref_mb->mv_x;
00538                             mb->mv_y = ref_mb->mv_y;
00539                         }
00540                     } else {
00541                         /* decode motion vector deltas */
00542                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00543                                             IVI_VLC_BITS, 1);
00544                         mv_y += IVI_TOSIGNED(mv_delta);
00545                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00546                                             IVI_VLC_BITS, 1);
00547                         mv_x += IVI_TOSIGNED(mv_delta);
00548                         mb->mv_x = mv_x;
00549                         mb->mv_y = mv_y;
00550                     }
00551                 }
00552             }
00553 
00554             mb++;
00555             if (ref_mb)
00556                 ref_mb++;
00557             mb_offset += band->mb_size;
00558         }
00559 
00560         offs += row_offset;
00561     }
00562 
00563     align_get_bits(&ctx->gb);
00564 
00565     return 0;
00566 }
00567 
00568 
00577 static int decode_band(IVI5DecContext *ctx, int plane_num,
00578                        IVIBandDesc *band, AVCodecContext *avctx)
00579 {
00580     int         result, i, t, idx1, idx2, pos;
00581     IVITile     *tile;
00582 
00583     band->buf     = band->bufs[ctx->dst_buf];
00584     band->ref_buf = band->bufs[ctx->ref_buf];
00585     band->data_ptr = ctx->frame_data + (get_bits_count(&ctx->gb) >> 3);
00586 
00587     result = decode_band_hdr(ctx, band, avctx);
00588     if (result) {
00589         av_log(avctx, AV_LOG_ERROR, "Error while decoding band header: %d\n",
00590                result);
00591         return -1;
00592     }
00593 
00594     if (band->is_empty) {
00595         av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n");
00596         return -1;
00597     }
00598 
00599     band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel];
00600 
00601     /* apply corrections to the selected rvmap table if present */
00602     for (i = 0; i < band->num_corr; i++) {
00603         idx1 = band->corr[i*2];
00604         idx2 = band->corr[i*2+1];
00605         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
00606         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
00607     }
00608 
00609     pos = get_bits_count(&ctx->gb);
00610 
00611     for (t = 0; t < band->num_tiles; t++) {
00612         tile = &band->tiles[t];
00613 
00614         tile->is_empty = get_bits1(&ctx->gb);
00615         if (tile->is_empty) {
00616             result = ff_ivi_process_empty_tile(avctx, band, tile,
00617                                       (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3));
00618             if (result < 0)
00619                 break;
00620         } else {
00621             tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb);
00622 
00623             result = decode_mb_info(ctx, band, tile, avctx);
00624             if (result < 0)
00625                 break;
00626 
00627             result = ff_ivi_decode_blocks(&ctx->gb, band, tile);
00628             if (result < 0 || (get_bits_count(&ctx->gb) - pos) >> 3 != tile->data_size) {
00629                 av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n");
00630                 break;
00631             }
00632             pos += tile->data_size << 3; // skip to next tile
00633         }
00634     }
00635 
00636     /* restore the selected rvmap table by applying its corrections in reverse order */
00637     for (i = band->num_corr-1; i >= 0; i--) {
00638         idx1 = band->corr[i*2];
00639         idx2 = band->corr[i*2+1];
00640         FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]);
00641         FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]);
00642     }
00643 
00644 #ifdef DEBUG
00645     if (band->checksum_present) {
00646         uint16_t chksum = ivi_calc_band_checksum(band);
00647         if (chksum != band->checksum) {
00648             av_log(avctx, AV_LOG_ERROR,
00649                    "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n",
00650                    band->plane, band->band_num, band->checksum, chksum);
00651         }
00652     }
00653 #endif
00654 
00655     align_get_bits(&ctx->gb);
00656 
00657     return result;
00658 }
00659 
00660 
00666 static void switch_buffers(IVI5DecContext *ctx)
00667 {
00668     switch (ctx->prev_frame_type) {
00669     case FRAMETYPE_INTRA:
00670     case FRAMETYPE_INTER:
00671         ctx->buf_switch ^= 1;
00672         ctx->dst_buf = ctx->buf_switch;
00673         ctx->ref_buf = ctx->buf_switch ^ 1;
00674         break;
00675     case FRAMETYPE_INTER_SCAL:
00676         if (!ctx->inter_scal) {
00677             ctx->ref2_buf   = 2;
00678             ctx->inter_scal = 1;
00679         }
00680         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
00681         ctx->ref_buf = ctx->ref2_buf;
00682         break;
00683     case FRAMETYPE_INTER_NOREF:
00684         break;
00685     }
00686 
00687     switch (ctx->frame_type) {
00688     case FRAMETYPE_INTRA:
00689         ctx->buf_switch = 0;
00690         /* FALLTHROUGH */
00691     case FRAMETYPE_INTER:
00692         ctx->inter_scal = 0;
00693         ctx->dst_buf = ctx->buf_switch;
00694         ctx->ref_buf = ctx->buf_switch ^ 1;
00695         break;
00696     case FRAMETYPE_INTER_SCAL:
00697     case FRAMETYPE_INTER_NOREF:
00698     case FRAMETYPE_NULL:
00699         break;
00700     }
00701 }
00702 
00703 
00707 static av_cold int decode_init(AVCodecContext *avctx)
00708 {
00709     IVI5DecContext  *ctx = avctx->priv_data;
00710     int             result;
00711 
00712     ff_ivi_init_static_vlc();
00713 
00714     /* copy rvmap tables in our context so we can apply changes to them */
00715     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
00716 
00717     /* set the initial picture layout according to the basic profile:
00718        there is only one band per plane (no scalability), only one tile (no local decoding)
00719        and picture format = YVU9 */
00720     ctx->pic_conf.pic_width     = avctx->width;
00721     ctx->pic_conf.pic_height    = avctx->height;
00722     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
00723     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
00724     ctx->pic_conf.tile_width    = avctx->width;
00725     ctx->pic_conf.tile_height   = avctx->height;
00726     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
00727 
00728     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
00729     if (result) {
00730         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
00731         return -1;
00732     }
00733 
00734     ctx->buf_switch = 0;
00735     ctx->inter_scal = 0;
00736 
00737     avctx->pix_fmt = PIX_FMT_YUV410P;
00738 
00739     return 0;
00740 }
00741 
00742 
00746 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00747                         AVPacket *avpkt)
00748 {
00749     IVI5DecContext  *ctx = avctx->priv_data;
00750     const uint8_t   *buf = avpkt->data;
00751     int             buf_size = avpkt->size;
00752     int             result, p, b;
00753 
00754     init_get_bits(&ctx->gb, buf, buf_size * 8);
00755     ctx->frame_data = buf;
00756     ctx->frame_size = buf_size;
00757 
00758     result = decode_pic_hdr(ctx, avctx);
00759     if (result || ctx->gop_invalid) {
00760         av_log(avctx, AV_LOG_ERROR,
00761                "Error while decoding picture header: %d\n", result);
00762         return -1;
00763     }
00764 
00765     if (ctx->gop_flags & IVI5_IS_PROTECTED) {
00766         av_log(avctx, AV_LOG_ERROR, "Password-protected clip!\n");
00767         return -1;
00768     }
00769 
00770     switch_buffers(ctx);
00771 
00772     //START_TIMER;
00773 
00774     if (ctx->frame_type != FRAMETYPE_NULL) {
00775         for (p = 0; p < 3; p++) {
00776             for (b = 0; b < ctx->planes[p].num_bands; b++) {
00777                 result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx);
00778                 if (result) {
00779                     av_log(avctx, AV_LOG_ERROR,
00780                            "Error while decoding band: %d, plane: %d\n", b, p);
00781                     return -1;
00782                 }
00783             }
00784         }
00785     }
00786 
00787     //STOP_TIMER("decode_planes");
00788 
00789     if (ctx->frame.data[0])
00790         avctx->release_buffer(avctx, &ctx->frame);
00791 
00792     ctx->frame.reference = 0;
00793     if (avctx->get_buffer(avctx, &ctx->frame) < 0) {
00794         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00795         return -1;
00796     }
00797 
00798     if (ctx->is_scalable) {
00799         ff_ivi_recompose53 (&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4);
00800     } else {
00801         ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]);
00802     }
00803 
00804     ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]);
00805     ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]);
00806 
00807     *data_size = sizeof(AVFrame);
00808     *(AVFrame*)data = ctx->frame;
00809 
00810     return buf_size;
00811 }
00812 
00813 
00817 static av_cold int decode_close(AVCodecContext *avctx)
00818 {
00819     IVI5DecContext *ctx = avctx->priv_data;
00820 
00821     ff_ivi_free_buffers(&ctx->planes[0]);
00822 
00823     if (ctx->mb_vlc.cust_tab.table)
00824         free_vlc(&ctx->mb_vlc.cust_tab);
00825 
00826     if (ctx->frame.data[0])
00827         avctx->release_buffer(avctx, &ctx->frame);
00828 
00829     return 0;
00830 }
00831 
00832 
00833 AVCodec ff_indeo5_decoder = {
00834     .name           = "indeo5",
00835     .type           = AVMEDIA_TYPE_VIDEO,
00836     .id             = CODEC_ID_INDEO5,
00837     .priv_data_size = sizeof(IVI5DecContext),
00838     .init           = decode_init,
00839     .close          = decode_close,
00840     .decode         = decode_frame,
00841     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
00842 };