static int decode_gop_header(IVI5DecContext *ctx, AVCodecContext *avctx) { int result, i, p, tile_size, pic_size_indx, mb_size, blk_size; int quant_mat, blk_size_changed = 0; IVIBandDesc *band, *band1, *band2; IVIPicConfig pic_conf; ctx->gop_flags = get_bits(&ctx->gb, 8); ctx->gop_hdr_size = (ctx->gop_flags & 1) ? get_bits(&ctx->gb, 16) : 0; if (ctx->gop_flags & IVI5_IS_PROTECTED) ctx->lock_word = get_bits_long(&ctx->gb, 32); tile_size = (ctx->gop_flags & 0x40) ? 64 << get_bits(&ctx->gb, 2) : 0; if (tile_size > 256) { av_log(avctx, AV_LOG_ERROR, "Invalid tile size: %d\n", tile_size); return -1; } /* decode number of wavelet bands */ /* num_levels * 3 + 1 */ pic_conf.luma_bands = get_bits(&ctx->gb, 2) * 3 + 1; pic_conf.chroma_bands = get_bits1(&ctx->gb) * 3 + 1; ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1; if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) { av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n", pic_conf.luma_bands, pic_conf.chroma_bands); return -1; } pic_size_indx = get_bits(&ctx->gb, 4); if (pic_size_indx == IVI5_PIC_SIZE_ESC) { pic_conf.pic_height = get_bits(&ctx->gb, 13); pic_conf.pic_width = get_bits(&ctx->gb, 13); } else { pic_conf.pic_height = ivi5_common_pic_sizes[pic_size_indx * 2 + 1] << 2; pic_conf.pic_width = ivi5_common_pic_sizes[pic_size_indx * 2 ] << 2; } if (ctx->gop_flags & 2) { av_log(avctx, AV_LOG_ERROR, "YV12 picture format not supported!\n"); return -1; } pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2; pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2; if (!tile_size) { pic_conf.tile_height = pic_conf.pic_height; pic_conf.tile_width = pic_conf.pic_width; } else { pic_conf.tile_height = pic_conf.tile_width = tile_size; } /* check if picture layout was changed and reallocate buffers */ if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) { result = ff_ivi_init_planes(ctx->planes, &pic_conf); if (result) { av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n"); return -1; } ctx->pic_conf = pic_conf; blk_size_changed = 1; /* force reallocation of the internal structures */ } for (p = 0; p <= 1; p++) { for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) { band = &ctx->planes[p].bands[i]; band->is_halfpel = get_bits1(&ctx->gb); mb_size = get_bits1(&ctx->gb); blk_size = 8 >> get_bits1(&ctx->gb); mb_size = blk_size << !mb_size; blk_size_changed = mb_size != band->mb_size || blk_size != band->blk_size; if (blk_size_changed) { band->mb_size = mb_size; band->blk_size = blk_size; } if (get_bits1(&ctx->gb)) { av_log(avctx, AV_LOG_ERROR, "Extended transform info encountered!\n"); return -1; } /* select transform function and scan pattern according to plane and band number */ switch ((p << 2) + i) { case 0: band->inv_transform = ff_ivi_inverse_slant_8x8; band->dc_transform = ff_ivi_dc_slant_2d; band->scan = ff_zigzag_direct; break; case 1: band->inv_transform = ff_ivi_row_slant8; band->dc_transform = ff_ivi_dc_row_slant; band->scan = ff_ivi_vertical_scan_8x8; break; case 2: band->inv_transform = ff_ivi_col_slant8; band->dc_transform = ff_ivi_dc_col_slant; band->scan = ff_ivi_horizontal_scan_8x8; break; case 3: band->inv_transform = ff_ivi_put_pixels_8x8; band->dc_transform = ff_ivi_put_dc_pixel_8x8; band->scan = ff_ivi_horizontal_scan_8x8; break; case 4: band->inv_transform = ff_ivi_inverse_slant_4x4; band->dc_transform = ff_ivi_dc_slant_2d; band->scan = ff_ivi_direct_scan_4x4; break; } band->is_2d_trans = band->inv_transform == ff_ivi_inverse_slant_8x8 || band->inv_transform == ff_ivi_inverse_slant_4x4; /* select dequant matrix according to plane and band number */ if (!p) { quant_mat = (pic_conf.luma_bands > 1) ? i+1 : 0; } else { quant_mat = 5; } if (band->blk_size == 8) { band->intra_base = &ivi5_base_quant_8x8_intra[quant_mat][0]; band->inter_base = &ivi5_base_quant_8x8_inter[quant_mat][0]; band->intra_scale = &ivi5_scale_quant_8x8_intra[quant_mat][0]; band->inter_scale = &ivi5_scale_quant_8x8_inter[quant_mat][0]; } else { band->intra_base = ivi5_base_quant_4x4_intra; band->inter_base = ivi5_base_quant_4x4_inter; band->intra_scale = ivi5_scale_quant_4x4_intra; band->inter_scale = ivi5_scale_quant_4x4_inter; } if (get_bits(&ctx->gb, 2)) { av_log(avctx, AV_LOG_ERROR, "End marker missing!\n"); return -1; } } } /* copy chroma parameters into the 2nd chroma plane */ for (i = 0; i < pic_conf.chroma_bands; i++) { band1 = &ctx->planes[1].bands[i]; band2 = &ctx->planes[2].bands[i]; band2->width = band1->width; band2->height = band1->height; band2->mb_size = band1->mb_size; band2->blk_size = band1->blk_size; band2->is_halfpel = band1->is_halfpel; band2->intra_base = band1->intra_base; band2->inter_base = band1->inter_base; band2->intra_scale = band1->intra_scale; band2->inter_scale = band1->inter_scale; band2->scan = band1->scan; band2->inv_transform = band1->inv_transform; band2->dc_transform = band1->dc_transform; band2->is_2d_trans = band1->is_2d_trans; } /* reallocate internal structures if needed */ if (blk_size_changed) { result = ff_ivi_init_tiles(ctx->planes, pic_conf.tile_width, pic_conf.tile_height); if (result) { av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate internal structures!\n"); return -1; } } if (ctx->gop_flags & 8) { if (get_bits(&ctx->gb, 3)) { av_log(avctx, AV_LOG_ERROR, "Alignment bits are not zero!\n"); return -1; } if (get_bits1(&ctx->gb)) skip_bits_long(&ctx->gb, 24); /* skip transparency fill color */ } align_get_bits(&ctx->gb); skip_bits(&ctx->gb, 23); /* FIXME: unknown meaning */ /* skip GOP extension if any */ if (get_bits1(&ctx->gb)) { do { i = get_bits(&ctx->gb, 16); } while (i & 0x8000); } align_get_bits(&ctx->gb); return 0; }