| /* |
| * MPEG-4 decoder / encoder common code |
| * Copyright (c) 2000,2001 Fabrice Bellard |
| * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * 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 "mpegutils.h" |
| #include "mpegvideo.h" |
| #include "mpeg4video.h" |
| #include "mpeg4data.h" |
| |
| uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3]; |
| |
| int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s) |
| { |
| switch (s->pict_type) { |
| case AV_PICTURE_TYPE_I: |
| return 16; |
| case AV_PICTURE_TYPE_P: |
| case AV_PICTURE_TYPE_S: |
| return s->f_code + 15; |
| case AV_PICTURE_TYPE_B: |
| return FFMAX3(s->f_code, s->b_code, 2) + 15; |
| default: |
| return -1; |
| } |
| } |
| |
| void ff_mpeg4_clean_buffers(MpegEncContext *s) |
| { |
| int c_wrap, c_xy, l_wrap, l_xy; |
| |
| l_wrap = s->b8_stride; |
| l_xy = (2 * s->mb_y - 1) * l_wrap + s->mb_x * 2 - 1; |
| c_wrap = s->mb_stride; |
| c_xy = (s->mb_y - 1) * c_wrap + s->mb_x - 1; |
| |
| /* clean AC */ |
| memset(s->ac_val[0] + l_xy, 0, (l_wrap * 2 + 1) * 16 * sizeof(int16_t)); |
| memset(s->ac_val[1] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t)); |
| memset(s->ac_val[2] + c_xy, 0, (c_wrap + 1) * 16 * sizeof(int16_t)); |
| |
| /* clean MV */ |
| // we can't clear the MVs as they might be needed by a B-frame |
| s->last_mv[0][0][0] = |
| s->last_mv[0][0][1] = |
| s->last_mv[1][0][0] = |
| s->last_mv[1][0][1] = 0; |
| } |
| |
| #define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0])) |
| #define tab_bias (tab_size / 2) |
| |
| // used by MPEG-4 and rv10 decoder |
| void ff_mpeg4_init_direct_mv(MpegEncContext *s) |
| { |
| int i; |
| for (i = 0; i < tab_size; i++) { |
| s->direct_scale_mv[0][i] = (i - tab_bias) * s->pb_time / s->pp_time; |
| s->direct_scale_mv[1][i] = (i - tab_bias) * (s->pb_time - s->pp_time) / |
| s->pp_time; |
| } |
| } |
| |
| static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, |
| int my, int i) |
| { |
| int xy = s->block_index[i]; |
| uint16_t time_pp = s->pp_time; |
| uint16_t time_pb = s->pb_time; |
| int p_mx, p_my; |
| |
| p_mx = s->next_picture.motion_val[0][xy][0]; |
| if ((unsigned)(p_mx + tab_bias) < tab_size) { |
| s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx; |
| s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx |
| : s->direct_scale_mv[1][p_mx + tab_bias]; |
| } else { |
| s->mv[0][i][0] = p_mx * time_pb / time_pp + mx; |
| s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx |
| : p_mx * (time_pb - time_pp) / time_pp; |
| } |
| p_my = s->next_picture.motion_val[0][xy][1]; |
| if ((unsigned)(p_my + tab_bias) < tab_size) { |
| s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my; |
| s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my |
| : s->direct_scale_mv[1][p_my + tab_bias]; |
| } else { |
| s->mv[0][i][1] = p_my * time_pb / time_pp + my; |
| s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my |
| : p_my * (time_pb - time_pp) / time_pp; |
| } |
| } |
| |
| #undef tab_size |
| #undef tab_bias |
| |
| /** |
| * @return the mb_type |
| */ |
| int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my) |
| { |
| const int mb_index = s->mb_x + s->mb_y * s->mb_stride; |
| const int colocated_mb_type = s->next_picture.mb_type[mb_index]; |
| uint16_t time_pp; |
| uint16_t time_pb; |
| int i; |
| |
| // FIXME avoid divides |
| // try special case with shifts for 1 and 3 B-frames? |
| |
| if (IS_8X8(colocated_mb_type)) { |
| s->mv_type = MV_TYPE_8X8; |
| for (i = 0; i < 4; i++) |
| ff_mpeg4_set_one_direct_mv(s, mx, my, i); |
| return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1; |
| } else if (IS_INTERLACED(colocated_mb_type)) { |
| s->mv_type = MV_TYPE_FIELD; |
| for (i = 0; i < 2; i++) { |
| int field_select = s->next_picture.ref_index[0][4 * mb_index + 2 * i]; |
| s->field_select[0][i] = field_select; |
| s->field_select[1][i] = i; |
| if (s->top_field_first) { |
| time_pp = s->pp_field_time - field_select + i; |
| time_pb = s->pb_field_time - field_select + i; |
| } else { |
| time_pp = s->pp_field_time + field_select - i; |
| time_pb = s->pb_field_time + field_select - i; |
| } |
| s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0] * |
| time_pb / time_pp + mx; |
| s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1] * |
| time_pb / time_pp + my; |
| s->mv[1][i][0] = mx ? s->mv[0][i][0] - |
| s->p_field_mv_table[i][0][mb_index][0] |
| : s->p_field_mv_table[i][0][mb_index][0] * |
| (time_pb - time_pp) / time_pp; |
| s->mv[1][i][1] = my ? s->mv[0][i][1] - |
| s->p_field_mv_table[i][0][mb_index][1] |
| : s->p_field_mv_table[i][0][mb_index][1] * |
| (time_pb - time_pp) / time_pp; |
| } |
| return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | |
| MB_TYPE_L0L1 | MB_TYPE_INTERLACED; |
| } else { |
| ff_mpeg4_set_one_direct_mv(s, mx, my, 0); |
| s->mv[0][1][0] = |
| s->mv[0][2][0] = |
| s->mv[0][3][0] = s->mv[0][0][0]; |
| s->mv[0][1][1] = |
| s->mv[0][2][1] = |
| s->mv[0][3][1] = s->mv[0][0][1]; |
| s->mv[1][1][0] = |
| s->mv[1][2][0] = |
| s->mv[1][3][0] = s->mv[1][0][0]; |
| s->mv[1][1][1] = |
| s->mv[1][2][1] = |
| s->mv[1][3][1] = s->mv[1][0][1]; |
| if ((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || |
| !s->quarter_sample) |
| s->mv_type = MV_TYPE_16X16; |
| else |
| s->mv_type = MV_TYPE_8X8; |
| // Note see prev line |
| return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; |
| } |
| } |
