| /* |
| * Indeo Video Interactive v4 compatible decoder |
| * Copyright (c) 2009-2011 Maxim Poliakovski |
| * |
| * This file is part of Libav. |
| * |
| * Libav is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * Libav is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with Libav; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Indeo Video Interactive version 4 decoder |
| * |
| * Indeo 4 data is usually transported within .avi or .mov files. |
| * Known FOURCCs: 'IV41' |
| */ |
| |
| #define ALT_BITSTREAM_READER_LE |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "dsputil.h" |
| #include "ivi_dsp.h" |
| #include "ivi_common.h" |
| #include "indeo4data.h" |
| |
| #define IVI4_STREAM_ANALYSER 0 |
| #define IVI4_DEBUG_CHECKSUM 0 |
| |
| /** |
| * Indeo 4 frame types. |
| */ |
| enum { |
| FRAMETYPE_INTRA = 0, |
| FRAMETYPE_BIDIR1 = 1, ///< bidirectional frame |
| FRAMETYPE_INTER = 2, ///< non-droppable P-frame |
| FRAMETYPE_BIDIR = 3, ///< bidirectional frame |
| FRAMETYPE_INTER_NOREF = 4, ///< droppable P-frame |
| FRAMETYPE_NULL_FIRST = 5, ///< empty frame with no data |
| FRAMETYPE_NULL_LAST = 6 ///< empty frame with no data |
| }; |
| |
| #define IVI4_PIC_SIZE_ESC 7 |
| |
| |
| typedef struct { |
| GetBitContext gb; |
| AVFrame frame; |
| RVMapDesc rvmap_tabs[9]; ///< local corrected copy of the static rvmap tables |
| |
| uint32_t frame_num; |
| int frame_type; |
| int prev_frame_type; ///< frame type of the previous frame |
| uint32_t data_size; ///< size of the frame data in bytes from picture header |
| int is_scalable; |
| int transp_status; ///< transparency mode status: 1 - enabled |
| |
| IVIPicConfig pic_conf; |
| IVIPlaneDesc planes[3]; ///< color planes |
| |
| int buf_switch; ///< used to switch between three buffers |
| int dst_buf; ///< buffer index for the currently decoded frame |
| int ref_buf; ///< inter frame reference buffer index |
| |
| IVIHuffTab mb_vlc; ///< current macroblock table descriptor |
| IVIHuffTab blk_vlc; ///< current block table descriptor |
| |
| uint16_t checksum; ///< frame checksum |
| |
| uint8_t rvmap_sel; |
| uint8_t in_imf; |
| uint8_t in_q; ///< flag for explicitly stored quantiser delta |
| uint8_t pic_glob_quant; |
| uint8_t unknown1; |
| |
| #if IVI4_STREAM_ANALYSER |
| uint8_t has_b_frames; |
| uint8_t has_transp; |
| uint8_t uses_tiling; |
| uint8_t uses_haar; |
| uint8_t uses_fullpel; |
| #endif |
| } IVI4DecContext; |
| |
| |
| struct { |
| InvTransformPtr *inv_trans; |
| DCTransformPtr *dc_trans; |
| int is_2d_trans; |
| } transforms[18] = { |
| { ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 }, |
| { NULL, NULL, 0 }, /* inverse Haar 8x1 */ |
| { NULL, NULL, 0 }, /* inverse Haar 1x8 */ |
| { ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 }, |
| { ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 }, |
| { ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 }, |
| { ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 }, |
| { NULL, NULL, 0 }, /* inverse DCT 8x8 */ |
| { NULL, NULL, 0 }, /* inverse DCT 8x1 */ |
| { NULL, NULL, 0 }, /* inverse DCT 1x8 */ |
| { NULL, NULL, 0 }, /* inverse Haar 4x4 */ |
| { ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 }, |
| { NULL, NULL, 0 }, /* no transform 4x4 */ |
| { NULL, NULL, 0 }, /* inverse Haar 1x4 */ |
| { NULL, NULL, 0 }, /* inverse Haar 4x1 */ |
| { NULL, NULL, 0 }, /* inverse slant 1x4 */ |
| { NULL, NULL, 0 }, /* inverse slant 4x1 */ |
| { NULL, NULL, 0 }, /* inverse DCT 4x4 */ |
| }; |
| |
| /** |
| * Decode subdivision of a plane. |
| * This is a simplified version that checks for two supported subdivisions: |
| * - 1 wavelet band per plane, size factor 1:1, code pattern: 3 |
| * - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3 |
| * Anything else is either unsupported or corrupt. |
| * |
| * @param[in,out] gb the GetBit context |
| * @return number of wavelet bands or 0 on error |
| */ |
| static int decode_plane_subdivision(GetBitContext *gb) |
| { |
| int i; |
| |
| switch (get_bits(gb, 2)) { |
| case 3: |
| return 1; |
| case 2: |
| for (i = 0; i < 4; i++) |
| if (get_bits(gb, 2) != 3) |
| return 0; |
| return 4; |
| default: |
| return 0; |
| } |
| } |
| |
| static inline int scale_tile_size(int def_size, int size_factor) |
| { |
| return (size_factor == 15 ? def_size : (size_factor + 1) << 5); |
| } |
| |
| /** |
| * Decode Indeo 4 picture header. |
| * |
| * @param[in,out] ctx pointer to the decoder context |
| * @param[in] avctx pointer to the AVCodecContext |
| * @return result code: 0 = OK, negative number = error |
| */ |
| static int decode_pic_hdr(IVI4DecContext *ctx, AVCodecContext *avctx) |
| { |
| int pic_size_indx, val, i, p; |
| IVIPicConfig pic_conf; |
| |
| if (get_bits(&ctx->gb, 18) != 0x3FFF8) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ctx->prev_frame_type = ctx->frame_type; |
| ctx->frame_type = get_bits(&ctx->gb, 3); |
| if (ctx->frame_type == 7) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| #if IVI4_STREAM_ANALYSER |
| if ( ctx->frame_type == FRAMETYPE_BIDIR1 |
| || ctx->frame_type == FRAMETYPE_BIDIR) |
| ctx->has_b_frames = 1; |
| #endif |
| |
| ctx->transp_status = get_bits1(&ctx->gb); |
| #if IVI4_STREAM_ANALYSER |
| if (ctx->transp_status) { |
| ctx->has_transp = 1; |
| } |
| #endif |
| |
| /* unknown bit: Mac decoder ignores this bit, XANIM returns error */ |
| if (get_bits1(&ctx->gb)) { |
| av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0; |
| |
| /* null frames don't contain anything else so we just return */ |
| if (ctx->frame_type >= FRAMETYPE_NULL_FIRST) { |
| av_dlog(avctx, "Null frame encountered!\n"); |
| return 0; |
| } |
| |
| /* Check key lock status. If enabled - ignore lock word. */ |
| /* Usually we have to prompt the user for the password, but */ |
| /* we don't do that because Indeo 4 videos can be decoded anyway */ |
| if (get_bits1(&ctx->gb)) { |
| skip_bits_long(&ctx->gb, 32); |
| av_dlog(avctx, "Password-protected clip!\n"); |
| } |
| |
| pic_size_indx = get_bits(&ctx->gb, 3); |
| if (pic_size_indx == IVI4_PIC_SIZE_ESC) { |
| pic_conf.pic_height = get_bits(&ctx->gb, 16); |
| pic_conf.pic_width = get_bits(&ctx->gb, 16); |
| } else { |
| pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1]; |
| pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ]; |
| } |
| |
| /* Decode tile dimensions. */ |
| if (get_bits1(&ctx->gb)) { |
| pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4)); |
| pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4)); |
| #if IVI4_STREAM_ANALYSER |
| ctx->uses_tiling = 1; |
| #endif |
| } else { |
| pic_conf.tile_height = pic_conf.pic_height; |
| pic_conf.tile_width = pic_conf.pic_width; |
| } |
| |
| /* Decode chroma subsampling. We support only 4:4 aka YVU9. */ |
| if (get_bits(&ctx->gb, 2)) { |
| av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2; |
| pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2; |
| |
| /* decode subdivision of the planes */ |
| pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb); |
| if (pic_conf.luma_bands) |
| pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb); |
| 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 AVERROR_INVALIDDATA; |
| } |
| |
| /* check if picture layout was changed and reallocate buffers */ |
| if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) { |
| if (ff_ivi_init_planes(ctx->planes, &pic_conf)) { |
| av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| ctx->pic_conf = pic_conf; |
| |
| /* set default macroblock/block dimensions */ |
| for (p = 0; p <= 2; p++) { |
| for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) { |
| ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4; |
| ctx->planes[p].bands[i].blk_size = !p ? 8 : 4; |
| } |
| } |
| |
| if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width, |
| ctx->pic_conf.tile_height)) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Couldn't reallocate internal structures!\n"); |
| return AVERROR(ENOMEM); |
| } |
| } |
| |
| ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0; |
| |
| /* skip decTimeEst field if present */ |
| if (get_bits1(&ctx->gb)) |
| skip_bits(&ctx->gb, 8); |
| |
| /* decode macroblock and block huffman codebooks */ |
| if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) || |
| ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx)) |
| return AVERROR_INVALIDDATA; |
| |
| ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8; |
| |
| ctx->in_imf = get_bits1(&ctx->gb); |
| ctx->in_q = get_bits1(&ctx->gb); |
| |
| ctx->pic_glob_quant = get_bits(&ctx->gb, 5); |
| |
| /* TODO: ignore this parameter if unused */ |
| ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0; |
| |
| ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0; |
| |
| /* skip picture header extension if any */ |
| while (get_bits1(&ctx->gb)) { |
| av_dlog(avctx, "Pic hdr extension encountered!\n"); |
| val = get_bits(&ctx->gb, 8); |
| } |
| |
| if (get_bits1(&ctx->gb)) { |
| av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n"); |
| } |
| |
| align_get_bits(&ctx->gb); |
| |
| return 0; |
| } |
| |
| |
| /** |
| * Decode Indeo 4 band header. |
| * |
| * @param[in,out] ctx pointer to the decoder context |
| * @param[in,out] band pointer to the band descriptor |
| * @param[in] avctx pointer to the AVCodecContext |
| * @return result code: 0 = OK, negative number = error |
| */ |
| static int decode_band_hdr(IVI4DecContext *ctx, IVIBandDesc *band, |
| AVCodecContext *avctx) |
| { |
| int plane, band_num, hdr_size, indx, transform_id, scan_indx; |
| int i; |
| |
| plane = get_bits(&ctx->gb, 2); |
| band_num = get_bits(&ctx->gb, 4); |
| if (band->plane != plane || band->band_num != band_num) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| band->is_empty = get_bits1(&ctx->gb); |
| if (!band->is_empty) { |
| hdr_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 4; |
| |
| band->is_halfpel = get_bits(&ctx->gb, 2); |
| if (band->is_halfpel >= 2) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n", |
| band->is_halfpel); |
| return AVERROR_INVALIDDATA; |
| } |
| #if IVI4_STREAM_ANALYSER |
| if (!band->is_halfpel) |
| ctx->uses_fullpel = 1; |
| #endif |
| |
| band->checksum_present = get_bits1(&ctx->gb); |
| if (band->checksum_present) |
| band->checksum = get_bits(&ctx->gb, 16); |
| |
| indx = get_bits(&ctx->gb, 2); |
| if (indx == 3) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| band->mb_size = 16 >> indx; |
| band->blk_size = 8 >> (indx >> 1); |
| |
| band->inherit_mv = get_bits1(&ctx->gb); |
| band->inherit_qdelta = get_bits1(&ctx->gb); |
| |
| band->glob_quant = get_bits(&ctx->gb, 5); |
| |
| if (!get_bits1(&ctx->gb) || ctx->frame_type == FRAMETYPE_INTRA) { |
| transform_id = get_bits(&ctx->gb, 5); |
| if (!transforms[transform_id].inv_trans) { |
| av_log_ask_for_sample(avctx, "Unimplemented transform: %d!\n", transform_id); |
| return AVERROR_PATCHWELCOME; |
| } |
| if ((transform_id >= 7 && transform_id <= 9) || |
| transform_id == 17) { |
| av_log_ask_for_sample(avctx, "DCT transform not supported yet!\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| #if IVI4_STREAM_ANALYSER |
| if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10) |
| ctx->uses_haar = 1; |
| #endif |
| |
| band->inv_transform = transforms[transform_id].inv_trans; |
| band->dc_transform = transforms[transform_id].dc_trans; |
| band->is_2d_trans = transforms[transform_id].is_2d_trans; |
| |
| scan_indx = get_bits(&ctx->gb, 4); |
| if (scan_indx == 15) { |
| av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| band->scan = scan_index_to_tab[scan_indx]; |
| |
| band->quant_mat = get_bits(&ctx->gb, 5); |
| if (band->quant_mat == 31) { |
| av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| /* decode block huffman codebook */ |
| if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, |
| &band->blk_vlc, avctx)) |
| return AVERROR_INVALIDDATA; |
| |
| /* select appropriate rvmap table for this band */ |
| band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8; |
| |
| /* decode rvmap probability corrections if any */ |
| band->num_corr = 0; /* there is no corrections */ |
| if (get_bits1(&ctx->gb)) { |
| band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */ |
| if (band->num_corr > 61) { |
| av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n", |
| band->num_corr); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* read correction pairs */ |
| for (i = 0; i < band->num_corr * 2; i++) |
| band->corr[i] = get_bits(&ctx->gb, 8); |
| } |
| } |
| |
| if (band->blk_size == 8) { |
| band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0]; |
| band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0]; |
| } else { |
| band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0]; |
| band->inter_base = &ivi4_quant_4x4_inter[quant_index_to_tab[band->quant_mat]][0]; |
| } |
| |
| /* Indeo 4 doesn't use scale tables */ |
| band->intra_scale = NULL; |
| band->inter_scale = NULL; |
| |
| align_get_bits(&ctx->gb); |
| |
| return 0; |
| } |
| |
| |
| /** |
| * Decode information (block type, cbp, quant delta, motion vector) |
| * for all macroblocks in the current tile. |
| * |
| * @param[in,out] ctx pointer to the decoder context |
| * @param[in,out] band pointer to the band descriptor |
| * @param[in,out] tile pointer to the tile descriptor |
| * @param[in] avctx pointer to the AVCodecContext |
| * @return result code: 0 = OK, negative number = error |
| */ |
| static int decode_mb_info(IVI4DecContext *ctx, IVIBandDesc *band, |
| IVITile *tile, AVCodecContext *avctx) |
| { |
| int x, y, mv_x, mv_y, mv_delta, offs, mb_offset, blks_per_mb, |
| mv_scale, mb_type_bits; |
| IVIMbInfo *mb, *ref_mb; |
| int row_offset = band->mb_size * band->pitch; |
| |
| mb = tile->mbs; |
| ref_mb = tile->ref_mbs; |
| offs = tile->ypos * band->pitch + tile->xpos; |
| |
| blks_per_mb = band->mb_size != band->blk_size ? 4 : 1; |
| mb_type_bits = ctx->frame_type == FRAMETYPE_BIDIR ? 2 : 1; |
| |
| /* scale factor for motion vectors */ |
| mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3); |
| mv_x = mv_y = 0; |
| |
| if (((tile->width + band->mb_size-1)/band->mb_size) * ((tile->height + band->mb_size-1)/band->mb_size) != tile->num_MBs) { |
| av_log(avctx, AV_LOG_ERROR, "num_MBs mismatch %d %d %d %d\n", tile->width, tile->height, band->mb_size, tile->num_MBs); |
| return -1; |
| } |
| |
| for (y = tile->ypos; y < tile->ypos + tile->height; y += band->mb_size) { |
| mb_offset = offs; |
| |
| for (x = tile->xpos; x < tile->xpos + tile->width; x += band->mb_size) { |
| mb->xpos = x; |
| mb->ypos = y; |
| mb->buf_offs = mb_offset; |
| |
| if (get_bits1(&ctx->gb)) { |
| if (ctx->frame_type == FRAMETYPE_INTRA) { |
| av_log(avctx, AV_LOG_ERROR, "Empty macroblock in an INTRA picture!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| mb->type = 1; /* empty macroblocks are always INTER */ |
| mb->cbp = 0; /* all blocks are empty */ |
| |
| mb->q_delta = 0; |
| if (!band->plane && !band->band_num && ctx->in_q) { |
| mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table, |
| IVI_VLC_BITS, 1); |
| mb->q_delta = IVI_TOSIGNED(mb->q_delta); |
| } |
| |
| mb->mv_x = mb->mv_y = 0; /* no motion vector coded */ |
| if (band->inherit_mv) { |
| /* motion vector inheritance */ |
| if (mv_scale) { |
| mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale); |
| mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale); |
| } else { |
| mb->mv_x = ref_mb->mv_x; |
| mb->mv_y = ref_mb->mv_y; |
| } |
| } |
| } else { |
| if (band->inherit_mv) { |
| mb->type = ref_mb->type; /* copy mb_type from corresponding reference mb */ |
| } else if (ctx->frame_type == FRAMETYPE_INTRA) { |
| mb->type = 0; /* mb_type is always INTRA for intra-frames */ |
| } else { |
| mb->type = get_bits(&ctx->gb, mb_type_bits); |
| } |
| |
| mb->cbp = get_bits(&ctx->gb, blks_per_mb); |
| |
| mb->q_delta = 0; |
| if (band->inherit_qdelta) { |
| if (ref_mb) mb->q_delta = ref_mb->q_delta; |
| } else if (mb->cbp || (!band->plane && !band->band_num && |
| ctx->in_q)) { |
| mb->q_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table, |
| IVI_VLC_BITS, 1); |
| mb->q_delta = IVI_TOSIGNED(mb->q_delta); |
| } |
| |
| if (!mb->type) { |
| mb->mv_x = mb->mv_y = 0; /* there is no motion vector in intra-macroblocks */ |
| } else { |
| if (band->inherit_mv) { |
| /* motion vector inheritance */ |
| if (mv_scale) { |
| mb->mv_x = ivi_scale_mv(ref_mb->mv_x, mv_scale); |
| mb->mv_y = ivi_scale_mv(ref_mb->mv_y, mv_scale); |
| } else { |
| mb->mv_x = ref_mb->mv_x; |
| mb->mv_y = ref_mb->mv_y; |
| } |
| } else { |
| /* decode motion vector deltas */ |
| mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table, |
| IVI_VLC_BITS, 1); |
| mv_y += IVI_TOSIGNED(mv_delta); |
| mv_delta = get_vlc2(&ctx->gb, ctx->mb_vlc.tab->table, |
| IVI_VLC_BITS, 1); |
| mv_x += IVI_TOSIGNED(mv_delta); |
| mb->mv_x = mv_x; |
| mb->mv_y = mv_y; |
| } |
| } |
| } |
| |
| mb++; |
| if (ref_mb) |
| ref_mb++; |
| mb_offset += band->mb_size; |
| } |
| |
| offs += row_offset; |
| } |
| |
| align_get_bits(&ctx->gb); |
| |
| return 0; |
| } |
| |
| |
| /** |
| * Decode an Indeo 4 band. |
| * |
| * @param[in,out] ctx pointer to the decoder context |
| * @param[in,out] band pointer to the band descriptor |
| * @param[in] avctx pointer to the AVCodecContext |
| * @return result code: 0 = OK, negative number = error |
| */ |
| static int decode_band(IVI4DecContext *ctx, int plane_num, |
| IVIBandDesc *band, AVCodecContext *avctx) |
| { |
| int result, i, t, pos, idx1, idx2; |
| IVITile *tile; |
| |
| band->buf = band->bufs[ctx->dst_buf]; |
| band->ref_buf = band->bufs[ctx->ref_buf]; |
| |
| result = decode_band_hdr(ctx, band, avctx); |
| if (result) { |
| av_log(avctx, AV_LOG_ERROR, "Error decoding band header\n"); |
| return result; |
| } |
| |
| if (band->is_empty) { |
| av_log(avctx, AV_LOG_ERROR, "Empty band encountered!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| band->rv_map = &ctx->rvmap_tabs[band->rvmap_sel]; |
| |
| /* apply corrections to the selected rvmap table if present */ |
| for (i = 0; i < band->num_corr; i++) { |
| idx1 = band->corr[i * 2]; |
| idx2 = band->corr[i * 2 + 1]; |
| FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]); |
| FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]); |
| } |
| |
| pos = get_bits_count(&ctx->gb); |
| |
| for (t = 0; t < band->num_tiles; t++) { |
| tile = &band->tiles[t]; |
| |
| tile->is_empty = get_bits1(&ctx->gb); |
| if (tile->is_empty) { |
| ff_ivi_process_empty_tile(avctx, band, tile, |
| (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3)); |
| av_dlog(avctx, "Empty tile encountered!\n"); |
| } else { |
| tile->data_size = ff_ivi_dec_tile_data_size(&ctx->gb); |
| if (!tile->data_size) { |
| av_log(avctx, AV_LOG_ERROR, "Tile data size is zero!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| result = decode_mb_info(ctx, band, tile, avctx); |
| if (result < 0) |
| break; |
| |
| result = ff_ivi_decode_blocks(&ctx->gb, band, tile); |
| if (result < 0 || ((get_bits_count(&ctx->gb) - pos) >> 3) != tile->data_size) { |
| av_log(avctx, AV_LOG_ERROR, "Corrupted tile data encountered!\n"); |
| break; |
| } |
| |
| pos += tile->data_size << 3; // skip to next tile |
| } |
| } |
| |
| /* restore the selected rvmap table by applying its corrections in reverse order */ |
| for (i = band->num_corr - 1; i >= 0; i--) { |
| idx1 = band->corr[i * 2]; |
| idx2 = band->corr[i * 2 + 1]; |
| FFSWAP(uint8_t, band->rv_map->runtab[idx1], band->rv_map->runtab[idx2]); |
| FFSWAP(int16_t, band->rv_map->valtab[idx1], band->rv_map->valtab[idx2]); |
| } |
| |
| #if defined(DEBUG) && IVI4_DEBUG_CHECKSUM |
| if (band->checksum_present) { |
| uint16_t chksum = ivi_calc_band_checksum(band); |
| if (chksum != band->checksum) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Band checksum mismatch! Plane %d, band %d, received: %x, calculated: %x\n", |
| band->plane, band->band_num, band->checksum, chksum); |
| } |
| } |
| #endif |
| |
| align_get_bits(&ctx->gb); |
| |
| return 0; |
| } |
| |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| IVI4DecContext *ctx = avctx->priv_data; |
| |
| ff_ivi_init_static_vlc(); |
| |
| /* copy rvmap tables in our context so we can apply changes to them */ |
| memcpy(ctx->rvmap_tabs, ff_ivi_rvmap_tabs, sizeof(ff_ivi_rvmap_tabs)); |
| |
| /* Force allocation of the internal buffers */ |
| /* during picture header decoding. */ |
| ctx->pic_conf.pic_width = 0; |
| ctx->pic_conf.pic_height = 0; |
| |
| avctx->pix_fmt = PIX_FMT_YUV410P; |
| |
| return 0; |
| } |
| |
| |
| /** |
| * Rearrange decoding and reference buffers. |
| * |
| * @param[in,out] ctx pointer to the decoder context |
| */ |
| static void switch_buffers(IVI4DecContext *ctx) |
| { |
| switch (ctx->prev_frame_type) { |
| case FRAMETYPE_INTRA: |
| case FRAMETYPE_INTER: |
| ctx->buf_switch ^= 1; |
| ctx->dst_buf = ctx->buf_switch; |
| ctx->ref_buf = ctx->buf_switch ^ 1; |
| break; |
| case FRAMETYPE_INTER_NOREF: |
| break; |
| } |
| |
| switch (ctx->frame_type) { |
| case FRAMETYPE_INTRA: |
| ctx->buf_switch = 0; |
| /* FALLTHROUGH */ |
| case FRAMETYPE_INTER: |
| ctx->dst_buf = ctx->buf_switch; |
| ctx->ref_buf = ctx->buf_switch ^ 1; |
| break; |
| case FRAMETYPE_INTER_NOREF: |
| case FRAMETYPE_NULL_FIRST: |
| case FRAMETYPE_NULL_LAST: |
| break; |
| } |
| } |
| |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| IVI4DecContext *ctx = avctx->priv_data; |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| int result, p, b; |
| |
| init_get_bits(&ctx->gb, buf, buf_size * 8); |
| |
| result = decode_pic_hdr(ctx, avctx); |
| if (result) { |
| av_log(avctx, AV_LOG_ERROR, "Error decoding picture header\n"); |
| return result; |
| } |
| |
| switch_buffers(ctx); |
| |
| if (ctx->frame_type < FRAMETYPE_NULL_FIRST) { |
| for (p = 0; p < 3; p++) { |
| for (b = 0; b < ctx->planes[p].num_bands; b++) { |
| result = decode_band(ctx, p, &ctx->planes[p].bands[b], avctx); |
| if (result) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Error decoding band: %d, plane: %d\n", b, p); |
| return result; |
| } |
| } |
| } |
| } |
| |
| /* If the bidirectional mode is enabled, next I and the following P frame will */ |
| /* be sent together. Unfortunately the approach below seems to be the only way */ |
| /* to handle the B-frames mode. That's exactly the same Intel decoders do. */ |
| if (ctx->frame_type == FRAMETYPE_INTRA) { |
| while (get_bits(&ctx->gb, 8)); // skip version string |
| skip_bits_long(&ctx->gb, 64); // skip padding, TODO: implement correct 8-bytes alignment |
| if (get_bits_left(&ctx->gb) > 18 && show_bits(&ctx->gb, 18) == 0x3FFF8) |
| av_log(avctx, AV_LOG_ERROR, "Buffer contains IP frames!\n"); |
| } |
| |
| if (ctx->frame.data[0]) |
| avctx->release_buffer(avctx, &ctx->frame); |
| |
| ctx->frame.reference = 0; |
| if ((result = avctx->get_buffer(avctx, &ctx->frame)) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return result; |
| } |
| |
| if (ctx->is_scalable) { |
| ff_ivi_recompose_haar(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0], 4); |
| } else { |
| ff_ivi_output_plane(&ctx->planes[0], ctx->frame.data[0], ctx->frame.linesize[0]); |
| } |
| |
| ff_ivi_output_plane(&ctx->planes[2], ctx->frame.data[1], ctx->frame.linesize[1]); |
| ff_ivi_output_plane(&ctx->planes[1], ctx->frame.data[2], ctx->frame.linesize[2]); |
| |
| *data_size = sizeof(AVFrame); |
| *(AVFrame*)data = ctx->frame; |
| |
| return buf_size; |
| } |
| |
| |
| static av_cold int decode_close(AVCodecContext *avctx) |
| { |
| IVI4DecContext *ctx = avctx->priv_data; |
| |
| ff_ivi_free_buffers(&ctx->planes[0]); |
| |
| if (ctx->frame.data[0]) |
| avctx->release_buffer(avctx, &ctx->frame); |
| |
| #if IVI4_STREAM_ANALYSER |
| if (ctx->is_scalable) |
| av_log(avctx, AV_LOG_ERROR, "This video uses scalability mode!\n"); |
| if (ctx->uses_tiling) |
| av_log(avctx, AV_LOG_ERROR, "This video uses local decoding!\n"); |
| if (ctx->has_b_frames) |
| av_log(avctx, AV_LOG_ERROR, "This video contains B-frames!\n"); |
| if (ctx->has_transp) |
| av_log(avctx, AV_LOG_ERROR, "Transparency mode is enabled!\n"); |
| if (ctx->uses_haar) |
| av_log(avctx, AV_LOG_ERROR, "This video uses Haar transform!\n"); |
| if (ctx->uses_fullpel) |
| av_log(avctx, AV_LOG_ERROR, "This video uses fullpel motion vectors!\n"); |
| #endif |
| |
| return 0; |
| } |
| |
| |
| AVCodec ff_indeo4_decoder = { |
| .name = "indeo4", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = CODEC_ID_INDEO4, |
| .priv_data_size = sizeof(IVI4DecContext), |
| .init = decode_init, |
| .close = decode_close, |
| .decode = decode_frame, |
| .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"), |
| }; |
