/* * Copyright (c) 2002 The FFmpeg Project * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" #include "h263.h" #include "internal.h" #include "intrax8.h" #include "mathops.h" #include "mpegutils.h" #include "mpegvideo.h" #include "msmpeg4.h" #include "msmpeg4data.h" #include "wmv2.h" static int parse_mb_skip(Wmv2Context *w) { int mb_x, mb_y; int coded_mb_count = 0; MpegEncContext *const s = &w->s; uint32_t *const mb_type = s->current_picture_ptr->mb_type; w->skip_type = get_bits(&s->gb, 2); switch (w->skip_type) { case SKIP_TYPE_NONE: for (mb_y = 0; mb_y < s->mb_height; mb_y++) for (mb_x = 0; mb_x < s->mb_width; mb_x++) mb_type[mb_y * s->mb_stride + mb_x] = MB_TYPE_16x16 | MB_TYPE_L0; break; case SKIP_TYPE_MPEG: if (get_bits_left(&s->gb) < s->mb_height * s->mb_width) return AVERROR_INVALIDDATA; for (mb_y = 0; mb_y < s->mb_height; mb_y++) for (mb_x = 0; mb_x < s->mb_width; mb_x++) mb_type[mb_y * s->mb_stride + mb_x] = (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; break; case SKIP_TYPE_ROW: for (mb_y = 0; mb_y < s->mb_height; mb_y++) { if (get_bits_left(&s->gb) < 1) return AVERROR_INVALIDDATA; if (get_bits1(&s->gb)) { for (mb_x = 0; mb_x < s->mb_width; mb_x++) mb_type[mb_y * s->mb_stride + mb_x] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; } else { for (mb_x = 0; mb_x < s->mb_width; mb_x++) mb_type[mb_y * s->mb_stride + mb_x] = (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; } } break; case SKIP_TYPE_COL: for (mb_x = 0; mb_x < s->mb_width; mb_x++) { if (get_bits_left(&s->gb) < 1) return AVERROR_INVALIDDATA; if (get_bits1(&s->gb)) { for (mb_y = 0; mb_y < s->mb_height; mb_y++) mb_type[mb_y * s->mb_stride + mb_x] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0; } else { for (mb_y = 0; mb_y < s->mb_height; mb_y++) mb_type[mb_y * s->mb_stride + mb_x] = (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0; } } break; } for (mb_y = 0; mb_y < s->mb_height; mb_y++) for (mb_x = 0; mb_x < s->mb_width; mb_x++) coded_mb_count += !IS_SKIP(mb_type[mb_y * s->mb_stride + mb_x]); if (coded_mb_count > get_bits_left(&s->gb)) return AVERROR_INVALIDDATA; return 0; } static int decode_ext_header(Wmv2Context *w) { MpegEncContext *const s = &w->s; GetBitContext gb; int fps; int code; if (s->avctx->extradata_size < 4) return AVERROR_INVALIDDATA; init_get_bits(&gb, s->avctx->extradata, 32); fps = get_bits(&gb, 5); s->bit_rate = get_bits(&gb, 11) * 1024; w->mspel_bit = get_bits1(&gb); s->loop_filter = get_bits1(&gb); w->abt_flag = get_bits1(&gb); w->j_type_bit = get_bits1(&gb); w->top_left_mv_flag = get_bits1(&gb); w->per_mb_rl_bit = get_bits1(&gb); code = get_bits(&gb, 3); if (code == 0) return AVERROR_INVALIDDATA; s->slice_height = s->mb_height / code; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%"PRId64", qpbit:%d, abt_flag:%d, j_type_bit:%d, " "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, " "slices:%d\n", fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter, code); return 0; } int ff_wmv2_decode_picture_header(MpegEncContext *s) { Wmv2Context *const w = (Wmv2Context *) s; int code; if (s->picture_number == 0) decode_ext_header(w); s->pict_type = get_bits1(&s->gb) + 1; if (s->pict_type == AV_PICTURE_TYPE_I) { code = get_bits(&s->gb, 7); av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code); } s->chroma_qscale = s->qscale = get_bits(&s->gb, 5); if (s->qscale <= 0) return AVERROR_INVALIDDATA; if (s->pict_type != AV_PICTURE_TYPE_I && show_bits(&s->gb, 1)) { GetBitContext gb = s->gb; int skip_type = get_bits(&gb, 2); int run = skip_type == SKIP_TYPE_COL ? s->mb_width : s->mb_height; while (run > 0) { int block = FFMIN(run, 25); if (get_bits(&gb, block) + 1 != 1<<block) break; run -= block; } if (!run) return FRAME_SKIPPED; } return 0; } int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s) { Wmv2Context *const w = (Wmv2Context *) s; if (s->pict_type == AV_PICTURE_TYPE_I) { if (w->j_type_bit) w->j_type = get_bits1(&s->gb); else w->j_type = 0; // FIXME check if (!w->j_type) { if (w->per_mb_rl_bit) s->per_mb_rl_table = get_bits1(&s->gb); else s->per_mb_rl_table = 0; if (!s->per_mb_rl_table) { s->rl_chroma_table_index = decode012(&s->gb); s->rl_table_index = decode012(&s->gb); } s->dc_table_index = get_bits1(&s->gb); // at minimum one bit per macroblock is required at least in a valid frame, // we discard frames much smaller than this. Frames smaller than 1/8 of the // smallest "black/skip" frame generally contain not much recoverable content // while at the same time they have the highest computational requirements // per byte if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16)) return AVERROR_INVALIDDATA; } s->inter_intra_pred = 0; s->no_rounding = 1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n", s->qscale, s->rl_chroma_table_index, s->rl_table_index, s->dc_table_index, s->per_mb_rl_table, w->j_type); } } else { int cbp_index; int ret; w->j_type = 0; ret = parse_mb_skip(w); if (ret < 0) return ret; cbp_index = decode012(&s->gb); w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index); if (w->mspel_bit) s->mspel = get_bits1(&s->gb); else s->mspel = 0; // FIXME check if (w->abt_flag) { w->per_mb_abt = get_bits1(&s->gb) ^ 1; if (!w->per_mb_abt) w->abt_type = decode012(&s->gb); } if (w->per_mb_rl_bit) s->per_mb_rl_table = get_bits1(&s->gb); else s->per_mb_rl_table = 0; if (!s->per_mb_rl_table) { s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } if (get_bits_left(&s->gb) < 2) return AVERROR_INVALIDDATA; s->dc_table_index = get_bits1(&s->gb); s->mv_table_index = get_bits1(&s->gb); s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE); s->no_rounding ^= 1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d " "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n", s->rl_table_index, s->rl_chroma_table_index, s->dc_table_index, s->mv_table_index, s->per_mb_rl_table, s->qscale, s->mspel, w->per_mb_abt, w->abt_type, w->cbp_table_index, s->inter_intra_pred); } } s->esc3_level_length = 0; s->esc3_run_length = 0; s->picture_number++; // FIXME ? if (w->j_type) { ff_intrax8_decode_picture(&w->x8, &s->current_picture, &s->gb, &s->mb_x, &s->mb_y, 2 * s->qscale, (s->qscale - 1) | 1, s->loop_filter, s->low_delay); ff_er_add_slice(&w->s.er, 0, 0, (w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1, ER_MB_END); return 1; } return 0; } static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr) { MpegEncContext *const s = &w->s; int ret; ret = ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr); if (ret < 0) return ret; if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel) w->hshift = get_bits1(&s->gb); else w->hshift = 0; return 0; } static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py) { MpegEncContext *const s = &w->s; int xy, wrap, diff, type; int16_t *A, *B, *C, *mot_val; wrap = s->b8_stride; xy = s->block_index[0]; mot_val = s->current_picture.motion_val[0][xy]; A = s->current_picture.motion_val[0][xy - 1]; B = s->current_picture.motion_val[0][xy - wrap]; C = s->current_picture.motion_val[0][xy + 2 - wrap]; if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag) diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1])); else diff = 0; if (diff >= 8) type = get_bits1(&s->gb); else type = 2; if (type == 0) { *px = A[0]; *py = A[1]; } else if (type == 1) { *px = B[0]; *py = B[1]; } else { /* special case for first (slice) line */ if (s->first_slice_line) { *px = A[0]; *py = A[1]; } else { *px = mid_pred(A[0], B[0], C[0]); *py = mid_pred(A[1], B[1], C[1]); } } return mot_val; } static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block, int n, int cbp) { MpegEncContext *const s = &w->s; static const int sub_cbp_table[3] = { 2, 3, 1 }; int sub_cbp, ret; if (!cbp) { s->block_last_index[n] = -1; return 0; } if (w->per_block_abt) w->abt_type = decode012(&s->gb); w->abt_type_table[n] = w->abt_type; if (w->abt_type) { // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated; const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable; // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable; sub_cbp = sub_cbp_table[decode012(&s->gb)]; if (sub_cbp & 1) if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0) return ret; if (sub_cbp & 2) if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0) return ret; s->block_last_index[n] = 63; return 0; } else { return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated); } } int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64]) { Wmv2Context *const w = (Wmv2Context *) s; int cbp, code, i, ret; uint8_t *coded_val; if (w->j_type) return 0; if (s->pict_type == AV_PICTURE_TYPE_P) { if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) { /* skip mb */ s->mb_intra = 0; for (i = 0; i < 6; i++) s->block_last_index[i] = -1; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; s->mb_skipped = 1; w->hshift = 0; return 0; } if (get_bits_left(&s->gb) <= 0) return AVERROR_INVALIDDATA; code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3); if (code < 0) return AVERROR_INVALIDDATA; s->mb_intra = (~code & 0x40) >> 6; cbp = code & 0x3f; } else { s->mb_intra = 1; if (get_bits_left(&s->gb) <= 0) return AVERROR_INVALIDDATA; code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2); if (code < 0) { av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } /* predict coded block pattern */ cbp = 0; for (i = 0; i < 6; i++) { int val = ((code >> (5 - i)) & 1); if (i < 4) { int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val); val = val ^ pred; *coded_val = val; } cbp |= val << (5 - i); } } if (!s->mb_intra) { int mx, my; wmv2_pred_motion(w, &mx, &my); if (cbp) { s->bdsp.clear_blocks(s->block[0]); if (s->per_mb_rl_table) { s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } if (w->abt_flag && w->per_mb_abt) { w->per_block_abt = get_bits1(&s->gb); if (!w->per_block_abt) w->abt_type = decode012(&s->gb); } else w->per_block_abt = 0; } if ((ret = wmv2_decode_motion(w, &mx, &my)) < 0) return ret; s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; s->mv[0][0][0] = mx; s->mv[0][0][1] = my; for (i = 0; i < 6; i++) { if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) { av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); return ret; } } } else { if (s->pict_type == AV_PICTURE_TYPE_P) ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp); ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0), show_bits(&s->gb, 24)); s->ac_pred = get_bits1(&s->gb); if (s->inter_intra_pred) { s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1); ff_dlog(s->avctx, "%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y); } if (s->per_mb_rl_table && cbp) { s->rl_table_index = decode012(&s->gb); s->rl_chroma_table_index = s->rl_table_index; } s->bdsp.clear_blocks(s->block[0]); for (i = 0; i < 6; i++) { if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) { av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i); return ret; } } } return 0; } static av_cold int wmv2_decode_init(AVCodecContext *avctx) { Wmv2Context *const w = avctx->priv_data; int ret; if ((ret = ff_msmpeg4_decode_init(avctx)) < 0) return ret; ff_wmv2_common_init(w); return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp, w->s.block, w->s.block_last_index, w->s.mb_width, w->s.mb_height); } static av_cold int wmv2_decode_end(AVCodecContext *avctx) { Wmv2Context *w = avctx->priv_data; ff_intrax8_common_end(&w->x8); return ff_h263_decode_end(avctx); } AVCodec ff_wmv2_decoder = { .name = "wmv2", .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_WMV2, .priv_data_size = sizeof(Wmv2Context), .init = wmv2_decode_init, .close = wmv2_decode_end, .decode = ff_h263_decode_frame, .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }, };