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10c8521265
This avoids inconsistent value combinations. Alternatively it would be possible to add more checks and careful use of temporary variables, but my try of this quickly seemed to become a rather large change. The disadvantage of this, is that the struct is copied back and forth. Fixes: index 6 out of bounds for type 'const uint16_t [5][16]' Fixes: 6557/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INDEO4_fuzzer-4787296550256640 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
704 lines
25 KiB
C
704 lines
25 KiB
C
/*
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* Indeo Video Interactive v4 compatible decoder
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* Copyright (c) 2009-2011 Maxim Poliakovski
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Indeo Video Interactive version 4 decoder
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*
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* Indeo 4 data is usually transported within .avi or .mov files.
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* Known FOURCCs: 'IV41'
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*/
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#define BITSTREAM_READER_LE
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#include "avcodec.h"
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#include "get_bits.h"
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#include "indeo4data.h"
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#include "internal.h"
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#include "ivi.h"
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#include "ivi_dsp.h"
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#define IVI4_PIC_SIZE_ESC 7
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static const struct {
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InvTransformPtr *inv_trans;
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DCTransformPtr *dc_trans;
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int is_2d_trans;
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} transforms[18] = {
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{ ff_ivi_inverse_haar_8x8, ff_ivi_dc_haar_2d, 1 },
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{ ff_ivi_row_haar8, ff_ivi_dc_haar_2d, 0 },
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{ ff_ivi_col_haar8, ff_ivi_dc_haar_2d, 0 },
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{ ff_ivi_put_pixels_8x8, ff_ivi_put_dc_pixel_8x8, 1 },
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{ ff_ivi_inverse_slant_8x8, ff_ivi_dc_slant_2d, 1 },
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{ ff_ivi_row_slant8, ff_ivi_dc_row_slant, 1 },
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{ ff_ivi_col_slant8, ff_ivi_dc_col_slant, 1 },
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{ NULL, NULL, 0 }, /* inverse DCT 8x8 */
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{ NULL, NULL, 0 }, /* inverse DCT 8x1 */
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{ NULL, NULL, 0 }, /* inverse DCT 1x8 */
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{ ff_ivi_inverse_haar_4x4, ff_ivi_dc_haar_2d, 1 },
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{ ff_ivi_inverse_slant_4x4, ff_ivi_dc_slant_2d, 1 },
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{ NULL, NULL, 0 }, /* no transform 4x4 */
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{ ff_ivi_row_haar4, ff_ivi_dc_haar_2d, 0 },
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{ ff_ivi_col_haar4, ff_ivi_dc_haar_2d, 0 },
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{ ff_ivi_row_slant4, ff_ivi_dc_row_slant, 0 },
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{ ff_ivi_col_slant4, ff_ivi_dc_col_slant, 0 },
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{ NULL, NULL, 0 }, /* inverse DCT 4x4 */
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};
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/**
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* Decode subdivision of a plane.
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* This is a simplified version that checks for two supported subdivisions:
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* - 1 wavelet band per plane, size factor 1:1, code pattern: 3
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* - 4 wavelet bands per plane, size factor 1:4, code pattern: 2,3,3,3,3
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* Anything else is either unsupported or corrupt.
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*
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* @param[in,out] gb the GetBit context
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* @return number of wavelet bands or 0 on error
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*/
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static int decode_plane_subdivision(GetBitContext *gb)
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{
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int i;
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switch (get_bits(gb, 2)) {
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case 3:
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return 1;
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case 2:
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for (i = 0; i < 4; i++)
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if (get_bits(gb, 2) != 3)
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return 0;
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return 4;
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default:
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return 0;
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}
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}
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static inline int scale_tile_size(int def_size, int size_factor)
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{
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return size_factor == 15 ? def_size : (size_factor + 1) << 5;
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}
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/**
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* Decode Indeo 4 picture header.
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*
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* @param[in,out] ctx pointer to the decoder context
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* @param[in] avctx pointer to the AVCodecContext
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* @return result code: 0 = OK, negative number = error
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*/
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static int decode_pic_hdr(IVI45DecContext *ctx, AVCodecContext *avctx)
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{
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int pic_size_indx, i, p;
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IVIPicConfig pic_conf;
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if (get_bits(&ctx->gb, 18) != 0x3FFF8) {
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av_log(avctx, AV_LOG_ERROR, "Invalid picture start code!\n");
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return AVERROR_INVALIDDATA;
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}
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ctx->prev_frame_type = ctx->frame_type;
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ctx->frame_type = get_bits(&ctx->gb, 3);
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if (ctx->frame_type == 7) {
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av_log(avctx, AV_LOG_ERROR, "Invalid frame type: %d\n", ctx->frame_type);
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return AVERROR_INVALIDDATA;
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}
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if (ctx->frame_type == IVI4_FRAMETYPE_BIDIR)
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ctx->has_b_frames = 1;
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ctx->has_transp = get_bits1(&ctx->gb);
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/* unknown bit: Mac decoder ignores this bit, XANIM returns error */
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if (get_bits1(&ctx->gb)) {
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av_log(avctx, AV_LOG_ERROR, "Sync bit is set!\n");
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return AVERROR_INVALIDDATA;
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}
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ctx->data_size = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 24) : 0;
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/* null frames don't contain anything else so we just return */
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if (ctx->frame_type >= IVI4_FRAMETYPE_NULL_FIRST) {
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ff_dlog(avctx, "Null frame encountered!\n");
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return 0;
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}
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/* Check key lock status. If enabled - ignore lock word. */
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/* Usually we have to prompt the user for the password, but */
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/* we don't do that because Indeo 4 videos can be decoded anyway */
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if (get_bits1(&ctx->gb)) {
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skip_bits_long(&ctx->gb, 32);
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ff_dlog(avctx, "Password-protected clip!\n");
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}
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pic_size_indx = get_bits(&ctx->gb, 3);
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if (pic_size_indx == IVI4_PIC_SIZE_ESC) {
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pic_conf.pic_height = get_bits(&ctx->gb, 16);
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pic_conf.pic_width = get_bits(&ctx->gb, 16);
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} else {
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pic_conf.pic_height = ivi4_common_pic_sizes[pic_size_indx * 2 + 1];
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pic_conf.pic_width = ivi4_common_pic_sizes[pic_size_indx * 2 ];
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}
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/* Decode tile dimensions. */
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ctx->uses_tiling = get_bits1(&ctx->gb);
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if (ctx->uses_tiling) {
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pic_conf.tile_height = scale_tile_size(pic_conf.pic_height, get_bits(&ctx->gb, 4));
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pic_conf.tile_width = scale_tile_size(pic_conf.pic_width, get_bits(&ctx->gb, 4));
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} else {
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pic_conf.tile_height = pic_conf.pic_height;
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pic_conf.tile_width = pic_conf.pic_width;
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}
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/* Decode chroma subsampling. We support only 4:4 aka YVU9. */
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if (get_bits(&ctx->gb, 2)) {
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av_log(avctx, AV_LOG_ERROR, "Only YVU9 picture format is supported!\n");
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return AVERROR_INVALIDDATA;
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}
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pic_conf.chroma_height = (pic_conf.pic_height + 3) >> 2;
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pic_conf.chroma_width = (pic_conf.pic_width + 3) >> 2;
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/* decode subdivision of the planes */
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pic_conf.luma_bands = decode_plane_subdivision(&ctx->gb);
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pic_conf.chroma_bands = 0;
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if (pic_conf.luma_bands)
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pic_conf.chroma_bands = decode_plane_subdivision(&ctx->gb);
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ctx->is_scalable = pic_conf.luma_bands != 1 || pic_conf.chroma_bands != 1;
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if (ctx->is_scalable && (pic_conf.luma_bands != 4 || pic_conf.chroma_bands != 1)) {
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av_log(avctx, AV_LOG_ERROR, "Scalability: unsupported subdivision! Luma bands: %d, chroma bands: %d\n",
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pic_conf.luma_bands, pic_conf.chroma_bands);
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return AVERROR_INVALIDDATA;
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}
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/* check if picture layout was changed and reallocate buffers */
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if (ivi_pic_config_cmp(&pic_conf, &ctx->pic_conf)) {
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if (ff_ivi_init_planes(avctx, ctx->planes, &pic_conf, 1)) {
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av_log(avctx, AV_LOG_ERROR, "Couldn't reallocate color planes!\n");
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ctx->pic_conf.luma_bands = 0;
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return AVERROR(ENOMEM);
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}
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ctx->pic_conf = pic_conf;
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/* set default macroblock/block dimensions */
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for (p = 0; p <= 2; p++) {
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for (i = 0; i < (!p ? pic_conf.luma_bands : pic_conf.chroma_bands); i++) {
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ctx->planes[p].bands[i].mb_size = !p ? (!ctx->is_scalable ? 16 : 8) : 4;
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ctx->planes[p].bands[i].blk_size = !p ? 8 : 4;
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}
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}
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if (ff_ivi_init_tiles(ctx->planes, ctx->pic_conf.tile_width,
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ctx->pic_conf.tile_height)) {
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av_log(avctx, AV_LOG_ERROR,
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"Couldn't reallocate internal structures!\n");
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return AVERROR(ENOMEM);
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}
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}
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ctx->frame_num = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 20) : 0;
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/* skip decTimeEst field if present */
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if (get_bits1(&ctx->gb))
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skip_bits(&ctx->gb, 8);
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/* decode macroblock and block huffman codebooks */
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if (ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_MB_HUFF, &ctx->mb_vlc, avctx) ||
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ff_ivi_dec_huff_desc(&ctx->gb, get_bits1(&ctx->gb), IVI_BLK_HUFF, &ctx->blk_vlc, avctx))
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return AVERROR_INVALIDDATA;
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ctx->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
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ctx->in_imf = get_bits1(&ctx->gb);
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ctx->in_q = get_bits1(&ctx->gb);
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ctx->pic_glob_quant = get_bits(&ctx->gb, 5);
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/* TODO: ignore this parameter if unused */
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ctx->unknown1 = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 0;
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ctx->checksum = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 16) : 0;
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/* skip picture header extension if any */
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while (get_bits1(&ctx->gb)) {
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ff_dlog(avctx, "Pic hdr extension encountered!\n");
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if (get_bits_left(&ctx->gb) < 10)
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return AVERROR_INVALIDDATA;
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skip_bits(&ctx->gb, 8);
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}
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if (get_bits1(&ctx->gb)) {
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av_log(avctx, AV_LOG_ERROR, "Bad blocks bits encountered!\n");
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}
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align_get_bits(&ctx->gb);
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return 0;
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}
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/**
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* Decode Indeo 4 band header.
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*
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* @param[in,out] ctx pointer to the decoder context
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* @param[in,out] band pointer to the band descriptor
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* @param[in] avctx pointer to the AVCodecContext
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* @return result code: 0 = OK, negative number = error
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*/
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static int decode_band_hdr(IVI45DecContext *ctx, IVIBandDesc *arg_band,
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AVCodecContext *avctx)
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{
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int plane, band_num, indx, transform_id, scan_indx;
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int i;
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int quant_mat;
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IVIBandDesc temp_band, *band = &temp_band;
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memcpy(&temp_band, arg_band, sizeof(temp_band));
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plane = get_bits(&ctx->gb, 2);
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band_num = get_bits(&ctx->gb, 4);
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if (band->plane != plane || band->band_num != band_num) {
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av_log(avctx, AV_LOG_ERROR, "Invalid band header sequence!\n");
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return AVERROR_INVALIDDATA;
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}
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band->is_empty = get_bits1(&ctx->gb);
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if (!band->is_empty) {
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int old_blk_size = band->blk_size;
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/* skip header size
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* If header size is not given, header size is 4 bytes. */
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if (get_bits1(&ctx->gb))
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skip_bits(&ctx->gb, 16);
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band->is_halfpel = get_bits(&ctx->gb, 2);
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if (band->is_halfpel >= 2) {
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av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported mv resolution: %d!\n",
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band->is_halfpel);
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return AVERROR_INVALIDDATA;
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}
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if (!band->is_halfpel)
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ctx->uses_fullpel = 1;
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band->checksum_present = get_bits1(&ctx->gb);
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if (band->checksum_present)
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band->checksum = get_bits(&ctx->gb, 16);
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indx = get_bits(&ctx->gb, 2);
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if (indx == 3) {
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av_log(avctx, AV_LOG_ERROR, "Invalid block size!\n");
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return AVERROR_INVALIDDATA;
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}
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band->mb_size = 16 >> indx;
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band->blk_size = 8 >> (indx >> 1);
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band->inherit_mv = get_bits1(&ctx->gb);
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band->inherit_qdelta = get_bits1(&ctx->gb);
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band->glob_quant = get_bits(&ctx->gb, 5);
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if (!get_bits1(&ctx->gb) || ctx->frame_type == IVI4_FRAMETYPE_INTRA) {
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transform_id = get_bits(&ctx->gb, 5);
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if (transform_id >= FF_ARRAY_ELEMS(transforms) ||
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!transforms[transform_id].inv_trans) {
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avpriv_request_sample(avctx, "Transform %d", transform_id);
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return AVERROR_PATCHWELCOME;
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}
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if ((transform_id >= 7 && transform_id <= 9) ||
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transform_id == 17) {
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avpriv_request_sample(avctx, "DCT transform");
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return AVERROR_PATCHWELCOME;
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}
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if (transform_id < 10 && band->blk_size < 8) {
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av_log(avctx, AV_LOG_ERROR, "wrong transform size!\n");
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return AVERROR_INVALIDDATA;
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}
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if ((transform_id >= 0 && transform_id <= 2) || transform_id == 10)
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ctx->uses_haar = 1;
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band->inv_transform = transforms[transform_id].inv_trans;
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band->dc_transform = transforms[transform_id].dc_trans;
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band->is_2d_trans = transforms[transform_id].is_2d_trans;
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if (transform_id < 10)
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band->transform_size = 8;
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else
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band->transform_size = 4;
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if (band->blk_size != band->transform_size) {
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av_log(avctx, AV_LOG_ERROR, "transform and block size mismatch (%d != %d)\n", band->transform_size, band->blk_size);
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return AVERROR_INVALIDDATA;
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}
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scan_indx = get_bits(&ctx->gb, 4);
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if (scan_indx == 15) {
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av_log(avctx, AV_LOG_ERROR, "Custom scan pattern encountered!\n");
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return AVERROR_INVALIDDATA;
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}
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if (scan_indx > 4 && scan_indx < 10) {
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if (band->blk_size != 4) {
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av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
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return AVERROR_INVALIDDATA;
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}
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} else if (band->blk_size != 8) {
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av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
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return AVERROR_INVALIDDATA;
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}
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band->scan = scan_index_to_tab[scan_indx];
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band->scan_size = band->blk_size;
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quant_mat = get_bits(&ctx->gb, 5);
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if (quant_mat == 31) {
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av_log(avctx, AV_LOG_ERROR, "Custom quant matrix encountered!\n");
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return AVERROR_INVALIDDATA;
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}
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if (quant_mat >= FF_ARRAY_ELEMS(quant_index_to_tab)) {
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avpriv_request_sample(avctx, "Quantization matrix %d",
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quant_mat);
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return AVERROR_INVALIDDATA;
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}
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band->quant_mat = quant_mat;
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} else {
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if (old_blk_size != band->blk_size) {
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av_log(avctx, AV_LOG_ERROR,
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"The band block size does not match the configuration "
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"inherited\n");
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return AVERROR_INVALIDDATA;
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}
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}
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if (quant_index_to_tab[band->quant_mat] > 4 && band->blk_size == 4) {
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av_log(avctx, AV_LOG_ERROR, "Invalid quant matrix for 4x4 block encountered!\n");
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band->quant_mat = 0;
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return AVERROR_INVALIDDATA;
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}
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if (band->scan_size != band->blk_size) {
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av_log(avctx, AV_LOG_ERROR, "mismatching scan table!\n");
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return AVERROR_INVALIDDATA;
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}
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if (band->transform_size == 8 && band->blk_size < 8) {
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av_log(avctx, AV_LOG_ERROR, "mismatching transform_size!\n");
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return AVERROR_INVALIDDATA;
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}
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/* decode block huffman codebook */
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if (!get_bits1(&ctx->gb))
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arg_band->blk_vlc.tab = ctx->blk_vlc.tab;
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else
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if (ff_ivi_dec_huff_desc(&ctx->gb, 1, IVI_BLK_HUFF,
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&arg_band->blk_vlc, avctx))
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return AVERROR_INVALIDDATA;
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/* select appropriate rvmap table for this band */
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band->rvmap_sel = get_bits1(&ctx->gb) ? get_bits(&ctx->gb, 3) : 8;
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/* decode rvmap probability corrections if any */
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band->num_corr = 0; /* there is no corrections */
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if (get_bits1(&ctx->gb)) {
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band->num_corr = get_bits(&ctx->gb, 8); /* get number of correction pairs */
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if (band->num_corr > 61) {
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av_log(avctx, AV_LOG_ERROR, "Too many corrections: %d\n",
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band->num_corr);
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return AVERROR_INVALIDDATA;
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}
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/* read correction pairs */
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for (i = 0; i < band->num_corr * 2; i++)
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band->corr[i] = get_bits(&ctx->gb, 8);
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}
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}
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if (band->blk_size == 8) {
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band->intra_base = &ivi4_quant_8x8_intra[quant_index_to_tab[band->quant_mat]][0];
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band->inter_base = &ivi4_quant_8x8_inter[quant_index_to_tab[band->quant_mat]][0];
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} else {
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band->intra_base = &ivi4_quant_4x4_intra[quant_index_to_tab[band->quant_mat]][0];
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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);
|
|
|
|
if (!band->scan) {
|
|
av_log(avctx, AV_LOG_ERROR, "band->scan not set\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
band->blk_vlc = arg_band->blk_vlc;
|
|
memcpy(arg_band, band, sizeof(*arg_band));
|
|
|
|
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(IVI45DecContext *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, s;
|
|
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 == IVI4_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;
|
|
mb->b_mv_x =
|
|
mb->b_mv_y = 0;
|
|
|
|
if (get_bits1(&ctx->gb)) {
|
|
if (ctx->frame_type == IVI4_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 && ref_mb) {
|
|
/* 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) {
|
|
/* copy mb_type from corresponding reference mb */
|
|
if (!ref_mb) {
|
|
av_log(avctx, AV_LOG_ERROR, "ref_mb unavailable\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
mb->type = ref_mb->type;
|
|
} else if (ctx->frame_type == IVI4_FRAMETYPE_INTRA ||
|
|
ctx->frame_type == IVI4_FRAMETYPE_INTRA1) {
|
|
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) {
|
|
if (ref_mb)
|
|
/* 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;
|
|
if (mb->type == 3) {
|
|
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->b_mv_x = -mv_x;
|
|
mb->b_mv_y = -mv_y;
|
|
}
|
|
}
|
|
if (mb->type == 2) {
|
|
mb->b_mv_x = -mb->mv_x;
|
|
mb->b_mv_y = -mb->mv_y;
|
|
mb->mv_x = 0;
|
|
mb->mv_y = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
s= band->is_halfpel;
|
|
if (mb->type)
|
|
if ( x + (mb->mv_x >>s) + (y+ (mb->mv_y >>s))*band->pitch < 0 ||
|
|
x + ((mb->mv_x+s)>>s) + band->mb_size - 1
|
|
+ (y+band->mb_size - 1 +((mb->mv_y+s)>>s))*band->pitch > band->bufsize -1) {
|
|
av_log(avctx, AV_LOG_ERROR, "motion vector %d %d outside reference\n", x*s + mb->mv_x, y*s + mb->mv_y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
mb++;
|
|
if (ref_mb)
|
|
ref_mb++;
|
|
mb_offset += band->mb_size;
|
|
}
|
|
|
|
offs += row_offset;
|
|
}
|
|
|
|
align_get_bits(&ctx->gb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Rearrange decoding and reference buffers.
|
|
*
|
|
* @param[in,out] ctx pointer to the decoder context
|
|
*/
|
|
static void switch_buffers(IVI45DecContext *ctx)
|
|
{
|
|
int is_prev_ref = 0, is_ref = 0;
|
|
|
|
switch (ctx->prev_frame_type) {
|
|
case IVI4_FRAMETYPE_INTRA:
|
|
case IVI4_FRAMETYPE_INTRA1:
|
|
case IVI4_FRAMETYPE_INTER:
|
|
is_prev_ref = 1;
|
|
break;
|
|
}
|
|
|
|
switch (ctx->frame_type) {
|
|
case IVI4_FRAMETYPE_INTRA:
|
|
case IVI4_FRAMETYPE_INTRA1:
|
|
case IVI4_FRAMETYPE_INTER:
|
|
is_ref = 1;
|
|
break;
|
|
}
|
|
|
|
if (is_prev_ref && is_ref) {
|
|
FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
|
|
} else if (is_prev_ref) {
|
|
FFSWAP(int, ctx->ref_buf, ctx->b_ref_buf);
|
|
FFSWAP(int, ctx->dst_buf, ctx->ref_buf);
|
|
}
|
|
}
|
|
|
|
|
|
static int is_nonnull_frame(IVI45DecContext *ctx)
|
|
{
|
|
return ctx->frame_type < IVI4_FRAMETYPE_NULL_FIRST;
|
|
}
|
|
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
IVI45DecContext *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 = AV_PIX_FMT_YUV410P;
|
|
|
|
ctx->decode_pic_hdr = decode_pic_hdr;
|
|
ctx->decode_band_hdr = decode_band_hdr;
|
|
ctx->decode_mb_info = decode_mb_info;
|
|
ctx->switch_buffers = switch_buffers;
|
|
ctx->is_nonnull_frame = is_nonnull_frame;
|
|
|
|
ctx->is_indeo4 = 1;
|
|
ctx->show_indeo4_info = 1;
|
|
|
|
ctx->dst_buf = 0;
|
|
ctx->ref_buf = 1;
|
|
ctx->b_ref_buf = 3; /* buffer 2 is used for scalability mode */
|
|
ctx->p_frame = av_frame_alloc();
|
|
if (!ctx->p_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
AVCodec ff_indeo4_decoder = {
|
|
.name = "indeo4",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo Video Interactive 4"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_INDEO4,
|
|
.priv_data_size = sizeof(IVI45DecContext),
|
|
.init = decode_init,
|
|
.close = ff_ivi_decode_close,
|
|
.decode = ff_ivi_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|