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 
00060 static int decode_gop_header(IVI45DecContext *ctx, AVCodecContext *avctx)
00061 {
00062     int             result, i, p, tile_size, pic_size_indx, mb_size, blk_size;
00063     int             quant_mat, blk_size_changed = 0;
00064     IVIBandDesc     *band, *band1, *band2;
00065     IVIPicConfig    pic_conf;
00066 
00067     ctx->gop_flags = get_bits(&ctx->gb, 8);
00068 
00069     ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0;
00070 
00071     if (ctx->gop_flags & IVI5_IS_PROTECTED)
00072         ctx->lock_word = get_bits_long(&ctx->gb, 32);
00073 
00074     tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0;
00075     if (tile_size > 256) {
00076         av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size);
00077         return -1;
00078     }
00079 
00080     /* decode number of wavelet bands */
00081     /* num_levels * 3 + 1 */
00082     pic_conf.luma_bands   = get_bits(&ctx->gb, 2) * 3 + 1;
00083     pic_conf.chroma_bands = get_bits1(&ctx->gb)   * 3 + 1;
00084     ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
00085     if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
00086         av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
00087                pic_conf.luma_bands, pic_conf.chroma_bands);
00088         return -1;
00089     }
00090 
00091     pic_size_indx = get_bits(&ctx->gb, 4);
00092     if (pic_size_indx == IVI5_PIC_SIZE_ESC) {
00093         pic_conf.pic_height = get_bits(&ctx->gb, 13);
00094         pic_conf.pic_width  = get_bits(&ctx->gb, 13);
00095     } else {
00096         pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2;
00097         pic_conf.pic_width  = ivi5_common_pic_sizes[pic_size_indx * 2    ] << 2;
00098     }
00099 
00100     if (ctx->gop_flags & 2) {
00101         av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n");
00102         return -1;
00103     }
00104 
00105     pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
00106     pic_conf.chroma_width  = (pic_conf.pic_width  + 3) >> 2;
00107 
00108     if (!tile_size) {
00109         pic_conf.tile_height = pic_conf.pic_height;
00110         pic_conf.tile_width  = pic_conf.pic_width;
00111     } else {
00112         pic_conf.tile_height = pic_conf.tile_width = tile_size;
00113     }
00114 
00115     /* check if picture layout was changed and reallocate buffers */
00116     if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
00117         result = ff_ivi_init_planes(ctx->planes, &pic_conf);
00118         if (result) {
00119             av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
00120             return -1;
00121         }
00122         ctx->pic_conf = pic_conf;
00123         blk_size_changed = 1; /* force reallocation of the internal structures */
00124     }
00125 
00126     for (p = 0; p <= 1; p++) {
00127         for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
00128             band = &ctx->planes[p].bands[i];
00129 
00130             band->is_halfpel = get_bits1(&ctx->gb);
00131 
00132             mb_size  = get_bits1(&ctx->gb);
00133             blk_size = 8 >> get_bits1(&ctx->gb);
00134             mb_size  = blk_size << !mb_size;
00135 
00136             blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size;
00137             if (blk_size_changed) {
00138                 band->mb_size  = mb_size;
00139                 band->blk_size = blk_size;
00140             }
00141 
00142             if (get_bits1(&ctx->gb)) {
00143                 av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n");
00144                 return -1;
00145             }
00146 
00147             /* select transform function and scan pattern according to plane and band number */
00148             switch ((p << 2) + i) {
00149             case 0:
00150                 band->inv_transform = ff_ivi_inverse_slant_8x8;
00151                 band->dc_transform  = ff_ivi_dc_slant_2d;
00152                 band->scan          = ff_zigzag_direct;
00153                 break;
00154 
00155             case 1:
00156                 band->inv_transform = ff_ivi_row_slant8;
00157                 band->dc_transform  = ff_ivi_dc_row_slant;
00158                 band->scan          = ff_ivi_vertical_scan_8x8;
00159                 break;
00160 
00161             case 2:
00162                 band->inv_transform = ff_ivi_col_slant8;
00163                 band->dc_transform  = ff_ivi_dc_col_slant;
00164                 band->scan          = ff_ivi_horizontal_scan_8x8;
00165                 break;
00166 
00167             case 3:
00168                 band->inv_transform = ff_ivi_put_pixels_8x8;
00169                 band->dc_transform  = ff_ivi_put_dc_pixel_8x8;
00170                 band->scan          = ff_ivi_horizontal_scan_8x8;
00171                 break;
00172 
00173             case 4:
00174                 band->inv_transform = ff_ivi_inverse_slant_4x4;
00175                 band->dc_transform  = ff_ivi_dc_slant_2d;
00176                 band->scan          = ff_ivi_direct_scan_4x4;
00177                 break;
00178             }
00179 
00180             band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 ||
00181                                 band->inv_transform == ff_ivi_inverse_slant_4x4;
00182 
00183             /* select dequant matrix according to plane and band number */
00184             if (!p) {
00185                 quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0;
00186             } else {
00187                 quant_mat = 5;
00188             }
00189 
00190             if (band->blk_size == 8) {
00191                 band->intra_base  = &ivi5_base_quant_8x8_intra[quant_mat][0];
00192                 band->inter_base  = &ivi5_base_quant_8x8_inter[quant_mat][0];
00193                 band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0];
00194                 band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0];
00195             } else {
00196                 band->intra_base  = ivi5_base_quant_4x4_intra;
00197                 band->inter_base  = ivi5_base_quant_4x4_inter;
00198                 band->intra_scale = ivi5_scale_quant_4x4_intra;
00199                 band->inter_scale = ivi5_scale_quant_4x4_inter;
00200             }
00201 
00202             if (get_bits(&ctx->gb, 2)) {
00203                 av_log(avctx, AV_LOG_ERROR, "End marker missing!\n");
00204                 return -1;
00205             }
00206         }
00207     }
00208 
00209     /* copy chroma parameters into the 2nd chroma plane */
00210     for (i = 0; i < pic_conf.chroma_bands; i++) {
00211         band1 = &ctx->planes[1].bands[i];
00212         band2 = &ctx->planes[2].bands[i];
00213 
00214         band2->width         = band1->width;
00215         band2->height        = band1->height;
00216         band2->mb_size       = band1->mb_size;
00217         band2->blk_size      = band1->blk_size;
00218         band2->is_halfpel    = band1->is_halfpel;
00219         band2->intra_base    = band1->intra_base;
00220         band2->inter_base    = band1->inter_base;
00221         band2->intra_scale   = band1->intra_scale;
00222         band2->inter_scale   = band1->inter_scale;
00223         band2->scan          = band1->scan;
00224         band2->inv_transform = band1->inv_transform;
00225         band2->dc_transform  = band1->dc_transform;
00226         band2->is_2d_trans   = band1->is_2d_trans;
00227     }
00228 
00229     /* reallocate internal structures if needed */
00230     if (blk_size_changed) {
00231         result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width,
00232                                    pic_conf.tile_height);
00233         if (result) {
00234             av_log(avctx, AV_LOG_ERROR,
00235                    "Couldn't reallocate internal structures!\n");
00236             return -1;
00237         }
00238     }
00239 
00240     if (ctx->gop_flags & 8) {
00241         if (get_bits(&ctx->gb, 3)) {
00242             av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n");
00243             return -1;
00244         }
00245 
00246         if (get_bits1(&ctx->gb))
00247             skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */
00248     }
00249 
00250     align_get_bits(&ctx->gb);
00251 
00252     skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */
00253 
00254     /* skip GOP extension if any */
00255     if (get_bits1(&ctx->gb)) {
00256         do {
00257             i = get_bits(&ctx->gb, 16);
00258         } while (i & 0x8000);
00259     }
00260 
00261     align_get_bits(&ctx->gb);
00262 
00263     return 0;
00264 }
00265 
00266 
00272 static inline void skip_hdr_extension(GetBitContext *gb)
00273 {
00274     int i, len;
00275 
00276     do {
00277         len = get_bits(gb, 8);
00278         for (i = 0; i < len; i++) skip_bits(gb, 8);
00279     } while(len);
00280 }
00281 
00282 
00290 static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
00291 {
00292     if (get_bits(&ctx->gb, 5) != 0x1F) {
00293         av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
00294         return -1;
00295     }
00296 
00297     ctx->prev_frame_type = ctx->frame_type;
00298     ctx->frame_type      = get_bits(&ctx->gb, 3);
00299     if (ctx->frame_type >= 5) {
00300         av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d \n", ctx->frame_type);
00301         return -1;
00302     }
00303 
00304     ctx->frame_num = get_bits(&ctx->gb, 8);
00305 
00306     if (ctx->frame_type == FRAMETYPE_INTRA) {
00307         ctx->gop_invalid = 1;
00308         if (decode_gop_header(ctx, avctx)) {
00309             av_log(avctx, AV_LOG_ERROR, "Invalid GOP header, skipping frames.\n");
00310             return AVERROR_INVALIDDATA;
00311         }
00312         ctx->gop_invalid = 0;
00313     }
00314 
00315     if (ctx->frame_type != FRAMETYPE_NULL) {
00316         ctx->frame_flags = get_bits(&ctx->gb, 8);
00317 
00318         ctx->pic_hdr_size = (ctx->frame_flags & 1) ? get_bits_long(&ctx->gb, 24) : 0;
00319 
00320         ctx->checksum = (ctx->frame_flags & 0x10) ? get_bits(&ctx->gb, 16) : 0;
00321 
00322         /* skip unknown extension if any */
00323         if (ctx->frame_flags & 0x20)
00324             skip_hdr_extension(&ctx->gb); /* XXX: untested */
00325 
00326         /* decode macroblock huffman codebook */
00327         if (ff_ivi_dec_huff_desc(&ctx->gb, ctx->frame_flags & 0x40, IVI_MB_HUFF, &ctx->mb_vlc, avctx))
00328             return -1;
00329 
00330         skip_bits(&ctx->gb, 3); /* FIXME: unknown meaning! */
00331     }
00332 
00333     align_get_bits(&ctx->gb);
00334 
00335     return 0;
00336 }
00337 
00338 
00347 static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *band,
00348                            AVCodecContext *avctx)
00349 {
00350     int         i;
00351     uint8_t     band_flags;
00352 
00353     band_flags = get_bits(&ctx->gb, 8);
00354 
00355     if (band_flags & 1) {
00356         band->is_empty = 1;
00357         return 0;
00358     }
00359 
00360     band->data_size = (ctx->frame_flags & 0x80) ? get_bits_long(&ctx->gb, 24) : 0;
00361 
00362     band->inherit_mv     = band_flags & 2;
00363     band->inherit_qdelta = band_flags & 8;
00364     band->qdelta_present = band_flags & 4;
00365     if (!band->qdelta_present) band->inherit_qdelta = 1;
00366 
00367     /* decode rvmap probability corrections if any */
00368     band->num_corr = 0; /* there are no corrections */
00369     if (band_flags & 0x10) {
00370         band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
00371         if (band->num_corr > 61) {
00372             av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
00373                    band->num_corr);
00374             return -1;
00375         }
00376 
00377         /* read correction pairs */
00378         for (i = 0; i < band->num_corr * 2; i++)
00379             band->corr[i] = get_bits(&ctx->gb, 8);
00380     }
00381 
00382     /* select appropriate rvmap table for this band */
00383     band->rvmap_sel = (band_flags & 0x40) ? get_bits(&ctx->gb, 3) : 8;
00384 
00385     /* decode block huffman codebook */
00386     if (ff_ivi_dec_huff_desc(&ctx->gb, band_flags & 0x80, IVI_BLK_HUFF, &band->blk_vlc, avctx))
00387         return -1;
00388 
00389     band->checksum_present = get_bits1(&ctx->gb);
00390     if (band->checksum_present)
00391         band->checksum = get_bits(&ctx->gb, 16);
00392 
00393     band->glob_quant = get_bits(&ctx->gb, 5);
00394 
00395     /* skip unknown extension if any */
00396     if (band_flags & 0x20) { /* XXX: untested */
00397         align_get_bits(&ctx->gb);
00398         skip_hdr_extension(&ctx->gb);
00399     }
00400 
00401     align_get_bits(&ctx->gb);
00402 
00403     return 0;
00404 }
00405 
00406 
00417 static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
00418                           IVITile *tile, AVCodecContext *avctx)
00419 {
00420     int         x, y, mv_x, mv_y, mv_delta, offs, mb_offset,
00421                 mv_scale, blks_per_mb;
00422     IVIMbInfo   *mb, *ref_mb;
00423     int         row_offset = band->mb_size * band->pitch;
00424 
00425     mb     = tile->mbs;
00426     ref_mb = tile->ref_mbs;
00427     offs   = tile->ypos * band->pitch + tile->xpos;
00428 
00429     if (!ref_mb &&
00430         ((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
00431         return AVERROR_INVALIDDATA;
00432 
00433     if (tile->num_MBs != IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size)) {
00434         av_log(avctx, AV_LOG_ERROR, "Allocated tile size %d mismatches parameters %d\n",
00435                tile->num_MBs, IVI_MBs_PER_TILE(tile->width, tile->height, band->mb_size));
00436         return AVERROR_INVALIDDATA;
00437     }
00438 
00439     /* scale factor for motion vectors */
00440     mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
00441     mv_x = mv_y = 0;
00442 
00443     for (y = tile->ypos; y < (tile->ypos + tile->height); y += band->mb_size) {
00444         mb_offset = offs;
00445 
00446         for (x = tile->xpos; x < (tile->xpos + tile->width); x += band->mb_size) {
00447             mb->xpos     = x;
00448             mb->ypos     = y;
00449             mb->buf_offs = mb_offset;
00450 
00451             if (get_bits1(&ctx->gb)) {
00452                 if (ctx->frame_type == FRAMETYPE_INTRA) {
00453                     av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n");
00454                     return -1;
00455                 }
00456                 mb->type = 1; /* empty macroblocks are always INTER */
00457                 mb->cbp  = 0; /* all blocks are empty */
00458 
00459                 mb->q_delta = 0;
00460                 if (!band->plane && !band->band_num && (ctx->frame_flags & 8)) {
00461                     mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00462                                            IVI_VLC_BITS, 1);
00463                     mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00464                 }
00465 
00466                 mb->mv_x = mb->mv_y = 0; /* no motion vector coded */
00467                 if (band->inherit_mv){
00468                     /* motion vector inheritance */
00469                     if (mv_scale) {
00470                         mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00471                         mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00472                     } else {
00473                         mb->mv_x = ref_mb->mv_x;
00474                         mb->mv_y = ref_mb->mv_y;
00475                     }
00476                 }
00477             } else {
00478                 if (band->inherit_mv) {
00479                     mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */
00480                 } else if (ctx->frame_type == FRAMETYPE_INTRA) {
00481                     mb->type = 0; /* mb_type is always INTRA for intra-frames */
00482                 } else {
00483                     mb->type = get_bits1(&ctx->gb);
00484                 }
00485 
00486                 blks_per_mb = band->mb_size != band->blk_size ? 4 : 1;
00487                 mb->cbp = get_bits(&ctx->gb, blks_per_mb);
00488 
00489                 mb->q_delta = 0;
00490                 if (band->qdelta_present) {
00491                     if (band->inherit_qdelta) {
00492                         if (ref_mb) mb->q_delta = ref_mb->q_delta;
00493                     } else if (mb->cbp || (!band->plane && !band->band_num &&
00494                                            (ctx->frame_flags & 8))) {
00495                         mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00496                                                IVI_VLC_BITS, 1);
00497                         mb->q_delta = IVI_TOSIGNED(mb->q_delta);
00498                     }
00499                 }
00500 
00501                 if (!mb->type) {
00502                     mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */
00503                 } else {
00504                     if (band->inherit_mv){
00505                         /* motion vector inheritance */
00506                         if (mv_scale) {
00507                             mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale);
00508                             mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale);
00509                         } else {
00510                             mb->mv_x = ref_mb->mv_x;
00511                             mb->mv_y = ref_mb->mv_y;
00512                         }
00513                     } else {
00514                         /* decode motion vector deltas */
00515                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00516                                             IVI_VLC_BITS, 1);
00517                         mv_y += IVI_TOSIGNED(mv_delta);
00518                         mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table,
00519                                             IVI_VLC_BITS, 1);
00520                         mv_x += IVI_TOSIGNED(mv_delta);
00521                         mb->mv_x = mv_x;
00522                         mb->mv_y = mv_y;
00523                     }
00524                 }
00525             }
00526 
00527             mb++;
00528             if (ref_mb)
00529                 ref_mb++;
00530             mb_offset += band->mb_size;
00531         }
00532 
00533         offs += row_offset;
00534     }
00535 
00536     align_get_bits(&ctx->gb);
00537 
00538     return 0;
00539 }
00540 
00541 
00547 static void switch_buffers(IVI45DecContext *ctx)
00548 {
00549     switch (ctx->prev_frame_type) {
00550     case FRAMETYPE_INTRA:
00551     case FRAMETYPE_INTER:
00552         ctx->buf_switch ^= 1;
00553         ctx->dst_buf = ctx->buf_switch;
00554         ctx->ref_buf = ctx->buf_switch ^ 1;
00555         break;
00556     case FRAMETYPE_INTER_SCAL:
00557         if (!ctx->inter_scal) {
00558             ctx->ref2_buf   = 2;
00559             ctx->inter_scal = 1;
00560         }
00561         FFSWAP(int, ctx->dst_buf, ctx->ref2_buf);
00562         ctx->ref_buf = ctx->ref2_buf;
00563         break;
00564     case FRAMETYPE_INTER_NOREF:
00565         break;
00566     }
00567 
00568     switch (ctx->frame_type) {
00569     case FRAMETYPE_INTRA:
00570         ctx->buf_switch = 0;
00571         /* FALLTHROUGH */
00572     case FRAMETYPE_INTER:
00573         ctx->inter_scal = 0;
00574         ctx->dst_buf = ctx->buf_switch;
00575         ctx->ref_buf = ctx->buf_switch ^ 1;
00576         break;
00577     case FRAMETYPE_INTER_SCAL:
00578     case FRAMETYPE_INTER_NOREF:
00579     case FRAMETYPE_NULL:
00580         break;
00581     }
00582 }
00583 
00584 
00585 static int is_nonnull_frame(IVI45DecContext *ctx)
00586 {
00587     return ctx->frame_type != FRAMETYPE_NULL;
00588 }
00589 
00590 
00594 static av_cold int decode_init(AVCodecContext *avctx)
00595 {
00596     IVI45DecContext  *ctx = avctx->priv_data;
00597     int             result;
00598 
00599     ff_ivi_init_static_vlc();
00600 
00601     /* copy rvmap tables in our context so we can apply changes to them */
00602     memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs));
00603 
00604     /* set the initial picture layout according to the basic profile:
00605        there is only one band per plane (no scalability), only one tile (no local decoding)
00606        and picture format = YVU9 */
00607     ctx->pic_conf.pic_width     = avctx->width;
00608     ctx->pic_conf.pic_height    = avctx->height;
00609     ctx->pic_conf.chroma_width  = (avctx->width  + 3) >> 2;
00610     ctx->pic_conf.chroma_height = (avctx->height + 3) >> 2;
00611     ctx->pic_conf.tile_width    = avctx->width;
00612     ctx->pic_conf.tile_height   = avctx->height;
00613     ctx->pic_conf.luma_bands    = ctx->pic_conf.chroma_bands = 1;
00614 
00615     result = ff_ivi_init_planes(ctx->planes, &ctx->pic_conf);
00616     if (result) {
00617         av_log(avctx, AV_LOG_ERROR, "Couldn't allocate color planes!\n");
00618         return -1;
00619     }
00620 
00621     ctx->buf_switch = 0;
00622     ctx->inter_scal = 0;
00623 
00624     ctx->decode_pic_hdr   = decode_pic_hdr;
00625     ctx->decode_band_hdr  = decode_band_hdr;
00626     ctx->decode_mb_info   = decode_mb_info;
00627     ctx->switch_buffers   = switch_buffers;
00628     ctx->is_nonnull_frame = is_nonnull_frame;
00629 
00630     avctx->pix_fmt = PIX_FMT_YUV410P;
00631 
00632     return 0;
00633 }
00634 
00635 
00636 AVCodec ff_indeo5_decoder = {
00637     .name           = "indeo5",
00638     .type           = AVMEDIA_TYPE_VIDEO,
00639     .id             = CODEC_ID_INDEO5,
00640     .priv_data_size = sizeof(IVI45DecContext),
00641     .init           = decode_init,
00642     .close          = ff_ivi_decode_close,
00643     .decode         = ff_ivi_decode_frame,
00644     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 5"),
00645 };